interface_handlers.c

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2008 Blender Foundation.
 * All rights reserved.
 * 
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <float.h>
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>

#include "MEM_guardedalloc.h"

#include "DNA_sensor_types.h"
#include "DNA_controller_types.h"
#include "DNA_actuator_types.h"

#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_utildefines.h"

#include "PIL_time.h"

#include "BKE_colortools.h"
#include "BKE_context.h"
#include "BKE_idprop.h"
#include "BKE_report.h"
#include "BKE_texture.h"
#include "BKE_tracking.h"
#include "BKE_unit.h"

#include "ED_screen.h"
#include "ED_util.h"
#include "ED_keyframing.h"

#include "UI_interface.h"

#include "BLF_api.h"

#include "interface_intern.h"

#include "RNA_access.h"

#include "WM_api.h"
#include "WM_types.h"

/* proto */
static void ui_add_smart_controller(bContext *C, uiBut *from, uiBut *to);
static void ui_add_link(bContext *C, uiBut *from, uiBut *to);

/***************** structs and defines ****************/

#define BUTTON_TOOLTIP_DELAY        0.500
#define BUTTON_FLASH_DELAY          0.020
#define MENU_SCROLL_INTERVAL        0.1
#define BUTTON_AUTO_OPEN_THRESH     0.3
#define BUTTON_MOUSE_TOWARDS_THRESH 1.0

typedef enum uiButtonActivateType {
    BUTTON_ACTIVATE_OVER,
    BUTTON_ACTIVATE,
    BUTTON_ACTIVATE_APPLY,
    BUTTON_ACTIVATE_TEXT_EDITING,
    BUTTON_ACTIVATE_OPEN
} uiButtonActivateType;

typedef enum uiHandleButtonState {
    BUTTON_STATE_INIT,
    BUTTON_STATE_HIGHLIGHT,
    BUTTON_STATE_WAIT_FLASH,
    BUTTON_STATE_WAIT_RELEASE,
    BUTTON_STATE_WAIT_KEY_EVENT,
    BUTTON_STATE_NUM_EDITING,
    BUTTON_STATE_TEXT_EDITING,
    BUTTON_STATE_TEXT_SELECTING,
    BUTTON_STATE_MENU_OPEN,
    BUTTON_STATE_WAIT_DRAG,
    BUTTON_STATE_EXIT
} uiHandleButtonState;

typedef enum uiButtonJumpType {
    BUTTON_EDIT_JUMP_NONE,
    BUTTON_EDIT_JUMP_DELIM,
    BUTTON_EDIT_JUMP_ALL
} uiButtonJumpType;

typedef enum uiButtonDelimType {
    BUTTON_DELIM_NONE,
    BUTTON_DELIM_ALPHA,
    BUTTON_DELIM_PUNCT,
    BUTTON_DELIM_BRACE,
    BUTTON_DELIM_OPERATOR,
    BUTTON_DELIM_QUOTE,
    BUTTON_DELIM_WHITESPACE,
    BUTTON_DELIM_OTHER
} uiButtonDelimType;

typedef struct uiHandleButtonData {
    wmWindowManager *wm;
    wmWindow *window;
    ARegion *region;

    int interactive;

    /* overall state */
    uiHandleButtonState state;
    int cancel, escapecancel, retval;
    int applied, appliedinteractive;
    wmTimer *flashtimer;

    /* edited value */
    char *str, *origstr;
    double value, origvalue, startvalue;
    float vec[3], origvec[3];
    int togdual, togonly;
    ColorBand *coba;

    /* tooltip */
    ARegion *tooltip;
    wmTimer *tooltiptimer;
    
    /* auto open */
    int used_mouse;
    wmTimer *autoopentimer;

    /* text selection/editing */
    int maxlen, selextend, selstartx;

    /* number editing / dragging */
    int draglastx, draglasty;
    int dragstartx, dragstarty;
    int dragchange, draglock, dragsel;
    float dragf, dragfstart;
    CBData *dragcbd;

    /* menu open (watch uiFreeActiveButtons) */
    uiPopupBlockHandle *menu;
    int menuretval;
    
    /* search box (watch uiFreeActiveButtons) */
    ARegion *searchbox;

    /* post activate */
    uiButtonActivateType posttype;
    uiBut *postbut;
} uiHandleButtonData;

typedef struct uiAfterFunc {
    struct uiAfterFunc *next, *prev;

    uiButHandleFunc func;
    void *func_arg1;
    void *func_arg2;
    void *func_arg3;
    
    uiButHandleNFunc funcN;
    void *func_argN;

    uiButHandleRenameFunc rename_func;
    void *rename_arg1;
    void *rename_orig;
    
    uiBlockHandleFunc handle_func;
    void *handle_func_arg;
    int retval;

    uiMenuHandleFunc butm_func;
    void *butm_func_arg;
    int a2;

    wmOperatorType *optype;
    int opcontext;
    PointerRNA *opptr;

    PointerRNA rnapoin;
    PropertyRNA *rnaprop;

    bContextStore *context;

    char undostr[512];

    int autokey;
} uiAfterFunc;

static int ui_but_contains_pt(uiBut *but, int mx, int my);
static int ui_mouse_inside_button(ARegion *ar, uiBut *but, int x, int y);
static void button_activate_state(bContext *C, uiBut *but, uiHandleButtonState state);
static int ui_handler_region_menu(bContext *C, wmEvent *event, void *userdata);
static void ui_handle_button_activate(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type);
static void button_timers_tooltip_remove(bContext *C, uiBut *but);

/* ******************** menu navigation helpers ************** */

static int ui_but_editable(uiBut *but)
{
    return ELEM5(but->type, LABEL, SEPR, ROUNDBOX, LISTBOX, PROGRESSBAR);
}

static uiBut *ui_but_prev(uiBut *but)
{
    while(but->prev) {
        but= but->prev;
        if(!ui_but_editable(but)) return but;
    }
    return NULL;
}

static uiBut *ui_but_next(uiBut *but)
{
    while(but->next) {
        but= but->next;
        if(!ui_but_editable(but)) return but;
    }
    return NULL;
}

static uiBut *ui_but_first(uiBlock *block)
{
    uiBut *but;
    
    but= block->buttons.first;
    while(but) {
        if(!ui_but_editable(but)) return but;
        but= but->next;
    }
    return NULL;
}

static uiBut *ui_but_last(uiBlock *block)
{
    uiBut *but;
    
    but= block->buttons.last;
    while(but) {
        if(!ui_but_editable(but)) return but;
        but= but->prev;
    }
    return NULL;
}

static int ui_is_a_warp_but(uiBut *but)
{
    if(U.uiflag & USER_CONTINUOUS_MOUSE)
        if(ELEM4(but->type, NUM, NUMABS, HSVCIRCLE, TRACKPREVIEW))
            return TRUE;

    return FALSE;
}

/* file selectors are exempt from utf-8 checks */
int ui_is_but_utf8(uiBut *but)
{
    if (but->rnaprop) {
        const int subtype= RNA_property_subtype(but->rnaprop);
        return !(ELEM4(subtype, PROP_FILEPATH, PROP_DIRPATH, PROP_FILENAME, PROP_BYTESTRING));
    }
    else {
        return !(but->flag & UI_BUT_NO_UTF8);
    }
}

/* ********************** button apply/revert ************************/

static ListBase UIAfterFuncs = {NULL, NULL};

static void ui_apply_but_func(bContext *C, uiBut *but)
{
    uiAfterFunc *after;
    uiBlock *block= but->block;

    /* these functions are postponed and only executed after all other
     * handling is done, i.e. menus are closed, in order to avoid conflicts
     * with these functions removing the buttons we are working with */

    if(but->func || but->funcN || block->handle_func || but->rename_func || (but->type == BUTM && block->butm_func) || but->optype || but->rnaprop) {
        after= MEM_callocN(sizeof(uiAfterFunc), "uiAfterFunc");

        if(but->func && ELEM(but, but->func_arg1, but->func_arg2)) {
            /* exception, this will crash due to removed button otherwise */
            but->func(C, but->func_arg1, but->func_arg2);
        }
        else
            after->func= but->func;

        after->func_arg1= but->func_arg1;
        after->func_arg2= but->func_arg2;
        after->func_arg3= but->func_arg3;

        after->funcN= but->funcN;
        after->func_argN= MEM_dupallocN(but->func_argN);

        after->rename_func= but->rename_func;
        after->rename_arg1= but->rename_arg1;
        after->rename_orig= but->rename_orig; /* needs free! */
        
        after->handle_func= block->handle_func;
        after->handle_func_arg= block->handle_func_arg;
        after->retval= but->retval;

        if(but->type == BUTM) {
            after->butm_func= block->butm_func;
            after->butm_func_arg= block->butm_func_arg;
            after->a2= but->a2;
        }

        after->optype= but->optype;
        after->opcontext= but->opcontext;
        after->opptr= but->opptr;

        after->rnapoin= but->rnapoin;
        after->rnaprop= but->rnaprop;

        if(but->context)
            after->context= CTX_store_copy(but->context);

        but->optype= NULL;
        but->opcontext= 0;
        but->opptr= NULL;

        BLI_addtail(&UIAfterFuncs, after);
    }
}

static void ui_apply_autokey_undo(bContext *C, uiBut *but)
{
    Scene *scene= CTX_data_scene(C);
    uiAfterFunc *after;

    if(but->flag & UI_BUT_UNDO) {
        const char *str= NULL;

        /* define which string to use for undo */
        if ELEM(but->type, LINK, INLINK) str= "Add button link";
        else if ELEM(but->type, MENU, ICONTEXTROW) str= but->drawstr;
        else if(but->drawstr[0]) str= but->drawstr;
        else str= but->tip;

        /* fallback, else we dont get an undo! */
        if(str == NULL || str[0] == '\0') {
            str= "Unknown Action";
        }

        /* delayed, after all other funcs run, popups are closed, etc */
        after= MEM_callocN(sizeof(uiAfterFunc), "uiAfterFunc");
        BLI_strncpy(after->undostr, str, sizeof(after->undostr));
        BLI_addtail(&UIAfterFuncs, after);
    }

    /* try autokey */
    ui_but_anim_autokey(C, but, scene, scene->r.cfra);
}

static void ui_apply_but_funcs_after(bContext *C)
{
    uiAfterFunc *afterf, after;
    PointerRNA opptr;
    ListBase funcs;

    /* copy to avoid recursive calls */
    funcs= UIAfterFuncs;
    UIAfterFuncs.first= UIAfterFuncs.last= NULL;

    for(afterf=funcs.first; afterf; afterf=after.next) {
        after= *afterf; /* copy to avoid memleak on exit() */
        BLI_freelinkN(&funcs, afterf);

        if(after.context)
            CTX_store_set(C, after.context);

        if(after.opptr) {
            /* free in advance to avoid leak on exit */
            opptr= *after.opptr,
            MEM_freeN(after.opptr);
        }

        if(after.optype)
            WM_operator_name_call(C, after.optype->idname, after.opcontext, (after.opptr)? &opptr: NULL);

        if(after.opptr)
            WM_operator_properties_free(&opptr);

        if(after.rnapoin.data)
            RNA_property_update(C, &after.rnapoin, after.rnaprop);

        if(after.context) {
            CTX_store_set(C, NULL);
            CTX_store_free(after.context);
        }

        if(after.func)
            after.func(C, after.func_arg1, after.func_arg2);
        if(after.funcN)
            after.funcN(C, after.func_argN, after.func_arg2);
        if(after.func_argN)
            MEM_freeN(after.func_argN);
        
        if(after.handle_func)
            after.handle_func(C, after.handle_func_arg, after.retval);
        if(after.butm_func)
            after.butm_func(C, after.butm_func_arg, after.a2);
        
        if(after.rename_func)
            after.rename_func(C, after.rename_arg1, after.rename_orig);
        if(after.rename_orig)
            MEM_freeN(after.rename_orig);
        
        if(after.undostr[0])
            ED_undo_push(C, after.undostr);
    }
}

static void ui_apply_but_BUT(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_BUTM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_set_but_val(but, but->hardmin);
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_BLOCK(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    if(ELEM3(but->type, MENU, ICONROW, ICONTEXTROW))
        ui_set_but_val(but, data->value);

    ui_check_but(but);
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_TOG(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    double value;
    int w, lvalue, push;
    
    /* local hack... */
    if(but->type==BUT_TOGDUAL && data->togdual) {
        if(but->pointype==SHO)
            but->poin += 2;
        else if(but->pointype==INT)
            but->poin += 4;
    }
    
    value= ui_get_but_val(but);
    lvalue= (int)value;
    
    if(but->bit) {
        w= BTST(lvalue, but->bitnr);
        if(w) lvalue = BCLR(lvalue, but->bitnr);
        else lvalue = BSET(lvalue, but->bitnr);
        
        if(but->type==TOGR) {
            if(!data->togonly) {
                lvalue= 1<<(but->bitnr);
    
                ui_set_but_val(but, (double)lvalue);
            }
            else {
                if(lvalue==0) lvalue= 1<<(but->bitnr);
            }
        }
        
        ui_set_but_val(but, (double)lvalue);
        if(but->type==ICONTOG || but->type==ICONTOGN) ui_check_but(but);
    }
    else {
        
        if(value==0.0) push= 1; 
        else push= 0;
        
        if(ELEM3(but->type, TOGN, ICONTOGN, OPTIONN)) push= !push;
        ui_set_but_val(but, (double)push);
        if(but->type==ICONTOG || but->type==ICONTOGN) ui_check_but(but);        
    }
    
    /* end local hack... */
    if(but->type==BUT_TOGDUAL && data->togdual) {
        if(but->pointype==SHO)
            but->poin -= 2;
        else if(but->pointype==INT)
            but->poin -= 4;
    }
    
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_ROW(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data)
{
    uiBut *bt;
    
    ui_set_but_val(but, but->hardmax);
    
    /* states of other row buttons */
    for(bt= block->buttons.first; bt; bt= bt->next)
        if(bt!=but && bt->poin==but->poin && ELEM(bt->type, ROW, LISTROW))
            ui_check_but(bt);
    
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_TEX(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    if(!data->str)
        return;

    ui_set_but_string(C, but, data->str);
    ui_check_but(but);

    /* give butfunc the original text too */
    /* feature used for bone renaming, channels, etc */
    /* afterfunc frees origstr */
    but->rename_orig= data->origstr;
    data->origstr= NULL;
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_NUM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    if(data->str) {
        if(ui_set_but_string(C, but, data->str)) {
            data->value= ui_get_but_val(but);
        }
        else {
            data->cancel= 1;
            return;
        }
    }
    else
        ui_set_but_val(but, data->value);

    ui_check_but(but);
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_TOG3(bContext *C, uiBut *but, uiHandleButtonData *data)
{ 
    if(but->pointype==SHO ) {
        short *sp= (short *)but->poin;
        
        if( BTST(sp[1], but->bitnr)) {
            sp[1]= BCLR(sp[1], but->bitnr);
            sp[0]= BCLR(sp[0], but->bitnr);
        }
        else if( BTST(sp[0], but->bitnr)) {
            sp[1]= BSET(sp[1], but->bitnr);
        } else {
            sp[0]= BSET(sp[0], but->bitnr);
        }
    }
    else {
        if( BTST(*(but->poin+2), but->bitnr)) {
            *(but->poin+2)= BCLR(*(but->poin+2), but->bitnr);
            *(but->poin)= BCLR(*(but->poin), but->bitnr);
        }
        else if( BTST(*(but->poin), but->bitnr)) {
            *(but->poin+2)= BSET(*(but->poin+2), but->bitnr);
        } else {
            *(but->poin)= BSET(*(but->poin), but->bitnr);
        }
    }
    
    ui_check_but(but);
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_VEC(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_set_but_vectorf(but, data->vec);
    ui_check_but(but);
    ui_apply_but_func(C, but);

    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_COLORBAND(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_CURVE(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_IDPOIN(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_set_but_string(C, but, data->str);
    ui_check_but(but);
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

#ifdef WITH_INTERNATIONAL
static void ui_apply_but_CHARTAB(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}
#endif

/* ****************** drag drop code *********************** */

static int ui_but_mouse_inside_icon(uiBut *but, ARegion *ar, wmEvent *event)
{
    rcti rect;
    int x= event->x, y= event->y; 
    
    ui_window_to_block(ar, but->block, &x, &y);
    
    rect.xmin= but->x1; rect.xmax= but->x2;
    rect.ymin= but->y1; rect.ymax= but->y2;
    
    if(but->imb); /* use button size itself */
    else if(but->flag & UI_ICON_LEFT) {
        rect.xmax= rect.xmin + (rect.ymax-rect.ymin);
    }
    else {
        int delta= (rect.xmax-rect.xmin) - (rect.ymax-rect.ymin);
        rect.xmin += delta/2;
        rect.xmax -= delta/2;
    }
    
    return BLI_in_rcti(&rect, x, y);
}

static int ui_but_start_drag(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    /* prevent other WM gestures to start while we try to drag */
    WM_gestures_remove(C);

    if( ABS(data->dragstartx - event->x) + ABS(data->dragstarty - event->y) > U.dragthreshold ) {
        wmDrag *drag;
        
        button_activate_state(C, but, BUTTON_STATE_EXIT);
        data->cancel= 1;
        
        drag= WM_event_start_drag(C, but->icon, but->dragtype, but->dragpoin, ui_get_but_val(but));
        if(but->imb)
            WM_event_drag_image(drag, but->imb, but->imb_scale, but->x2-but->x1, but->y2-but->y1);
        return 1;
    }
    
    return 0;
}

/* ********************** linklines *********************** */

static void ui_delete_active_linkline(uiBlock *block)
{
    uiBut *but;
    uiLink *link;
    uiLinkLine *line, *nline;
    int a, b;
    
    but= block->buttons.first;
    while(but) {
        if(but->type==LINK && but->link) {
            line= but->link->lines.first;
            while(line) {
                
                nline= line->next;
                
                if(line->flag & UI_SELECT) {
                    BLI_remlink(&but->link->lines, line);
                    
                    link= line->from->link;
                    
                    /* are there more pointers allowed? */
                    if(link->ppoin) {
                        
                        if(*(link->totlink)==1) {
                            *(link->totlink)= 0;
                            MEM_freeN(*(link->ppoin));
                            *(link->ppoin)= NULL;
                        }
                        else {
                            b= 0;
                            for(a=0; a< (*(link->totlink)); a++) {
                                
                                if( (*(link->ppoin))[a] != line->to->poin ) {
                                    (*(link->ppoin))[b]= (*(link->ppoin))[a];
                                    b++;
                                }
                            }   
                            (*(link->totlink))--;
                        }
                    }
                    else {
                        *(link->poin)= NULL;
                    }
                    
                    MEM_freeN(line);
                }
                line= nline;
            }
        }
        but= but->next;
    }
}


static uiLinkLine *ui_is_a_link(uiBut *from, uiBut *to)
{
    uiLinkLine *line;
    uiLink *link;
    
    link= from->link;
    if(link) {
        line= link->lines.first;
        while(line) {
            if(line->from==from && line->to==to) return line;
            line= line->next;
        }
    }
    return NULL;
}

/* XXX BAD BAD HACK, fixme later **************** */
/* Try to add an AND Controller between the sensor and the actuator logic bricks and to connect them all */
static void ui_add_smart_controller(bContext *C, uiBut *from, uiBut *to)
{
    Object *ob= NULL;
    bSensor *sens_iter;
    bActuator *act_to, *act_iter;
    bController *cont;
    bController ***sens_from_links;
    uiBut *tmp_but;

    uiLink *link= from->link;

    if(link->ppoin)
        sens_from_links= (bController ***)(link->ppoin);
    else return;

    act_to = (bActuator *)(to->poin);

    /* (1) get the object */
    CTX_DATA_BEGIN(C, Object*, ob_iter, selected_editable_objects) {
        for (sens_iter= ob_iter->sensors.first; sens_iter; sens_iter= sens_iter->next)
        {
            if (&(sens_iter->links) == sens_from_links) {
                ob= ob_iter;
                break;
            }
        }
        if (ob) break;
    } CTX_DATA_END;

    if(!ob) return;

    /* (2) check if the sensor and the actuator are from the same object */
    for (act_iter= ob->actuators.first; act_iter; act_iter= (bActuator *)act_iter->next) {
        if (act_iter == act_to)
            break;
    }

    // only works if the sensor and the actuator are from the same object
    if(!act_iter) return;

    /* (3) add a new controller */
    if (WM_operator_name_call(C, "LOGIC_OT_controller_add", WM_OP_EXEC_DEFAULT, NULL) & OPERATOR_FINISHED) {
        cont = (bController *)ob->controllers.last;

        /* (4) link the sensor->controller->actuator */
        tmp_but = MEM_callocN(sizeof(uiBut), "uiBut");
        uiSetButLink(tmp_but, (void **)&cont, (void ***)&(cont->links), &(cont->totlinks), from->link->tocode, (int)to->hardmin);
        tmp_but->hardmin= from->link->tocode;
        tmp_but->poin= (char *)cont;

        tmp_but->type= INLINK;
        ui_add_link(C, from, tmp_but);

        tmp_but->type= LINK;
        ui_add_link(C, tmp_but, to);

        /* (5) garbage collection */
        MEM_freeN(tmp_but->link);
        MEM_freeN(tmp_but);
    }
}

static void ui_add_link(bContext *C, uiBut *from, uiBut *to)
{
    /* in 'from' we have to add a link to 'to' */
    uiLink *link;
    uiLinkLine *line;
    void **oldppoin;
    int a;
    
    if( (line= ui_is_a_link(from, to)) ) {
        line->flag |= UI_SELECT;
        ui_delete_active_linkline(from->block);
        return;
    }

    if (from->type==INLINK && to->type==INLINK) {
        return;
    }
    else if (from->type==LINK && to->type==INLINK) {
        if( from->link->tocode != (int)to->hardmin ) {
            ui_add_smart_controller(C, from, to);
            return;
        }
    }
    else if(from->type==INLINK && to->type==LINK) {
        if( to->link->tocode == (int)from->hardmin ) {
            return;
        }
    }
    
    link= from->link;
    
    /* are there more pointers allowed? */
    if(link->ppoin) {
        oldppoin= *(link->ppoin);
        
        (*(link->totlink))++;
        *(link->ppoin)= MEM_callocN( *(link->totlink)*sizeof(void *), "new link");
        
        for(a=0; a< (*(link->totlink))-1; a++) {
            (*(link->ppoin))[a]= oldppoin[a];
        }
        (*(link->ppoin))[a]= to->poin;
        
        if(oldppoin) MEM_freeN(oldppoin);
    }
    else {
        *(link->poin)= to->poin;
    }
    
}


static void ui_apply_but_LINK(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ARegion *ar= CTX_wm_region(C);
    uiBut *bt;
    
    for(bt= but->block->buttons.first; bt; bt= bt->next) {
        if( ui_mouse_inside_button(ar, bt, but->linkto[0]+ar->winrct.xmin, but->linkto[1]+ar->winrct.ymin) )
            break;
    }
    if(bt && bt!=but) {
        if (!ELEM(bt->type, LINK, INLINK) || !ELEM(but->type, LINK, INLINK))
            return;
        
        if(but->type==LINK) ui_add_link(C, but, bt);
        else ui_add_link(C, bt, but);

        ui_apply_but_func(C, but);
        data->retval= but->retval;
    }
    data->applied= 1;
}

static void ui_apply_but_IMAGE(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_HISTOGRAM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_WAVEFORM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}

static void ui_apply_but_TRACKPREVIEW(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    ui_apply_but_func(C, but);
    data->retval= but->retval;
    data->applied= 1;
}


static void ui_apply_button(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, int interactive)
{
    char *editstr;
    double *editval;
    float *editvec;
    ColorBand *editcoba;
    CurveMapping *editcumap;

    data->retval= 0;

    /* if we cancel and have not applied yet, there is nothing to do,
     * otherwise we have to restore the original value again */
    if(data->cancel) {
        if(!data->applied)
            return;

        if(data->str) MEM_freeN(data->str);
        data->str= data->origstr;
        data->origstr= NULL;
        data->value= data->origvalue;
        data->origvalue= 0.0;
        copy_v3_v3(data->vec, data->origvec);
        data->origvec[0]= data->origvec[1]= data->origvec[2]= 0.0f;
    }
    else {
        /* we avoid applying interactive edits a second time
         * at the end with the appliedinteractive flag */
        if(interactive)
            data->appliedinteractive= 1;
        else if(data->appliedinteractive)
            return;
    }

    /* ensures we are writing actual values */
    editstr= but->editstr;
    editval= but->editval;
    editvec= but->editvec;
    editcoba= but->editcoba;
    editcumap= but->editcumap;
    but->editstr= NULL;
    but->editval= NULL;
    but->editvec= NULL;
    but->editcoba= NULL;
    but->editcumap= NULL;

    /* handle different types */
    switch(but->type) {
        case BUT:
            ui_apply_but_BUT(C, but, data);
            break;
        case TEX:
        case SEARCH_MENU:
            ui_apply_but_TEX(C, but, data);
            break;
        case TOGBUT: 
        case TOG: 
        case TOGR: 
        case ICONTOG:
        case ICONTOGN:
        case TOGN:
        case BUT_TOGDUAL:
        case OPTION:
        case OPTIONN:
            ui_apply_but_TOG(C, but, data);
            break;
        case ROW:
        case LISTROW:
            ui_apply_but_ROW(C, block, but, data);
            break;
        case SCROLL:
        case NUM:
        case NUMABS:
        case SLI:
        case NUMSLI:
            ui_apply_but_NUM(C, but, data);
            break;
        case HSVSLI:
            break;
        case TOG3:  
            ui_apply_but_TOG3(C, but, data);
            break;
        case MENU:
        case ICONROW:
        case ICONTEXTROW:
        case BLOCK:
        case PULLDOWN:
        case COL:
            ui_apply_but_BLOCK(C, but, data);
            break;
        case BUTM:
            ui_apply_but_BUTM(C, but, data);
            break;
        case BUT_NORMAL:
        case HSVCUBE:
        case HSVCIRCLE:
            ui_apply_but_VEC(C, but, data);
            break;
        case BUT_COLORBAND:
            ui_apply_but_COLORBAND(C, but, data);
            break;
        case BUT_CURVE:
            ui_apply_but_CURVE(C, but, data);
            break;
        case IDPOIN:
            ui_apply_but_IDPOIN(C, but, data);
            break;
#ifdef WITH_INTERNATIONAL
        case CHARTAB:
            ui_apply_but_CHARTAB(C, but, data);
            break;
#endif
        case KEYEVT:
        case HOTKEYEVT:
            ui_apply_but_BUT(C, but, data);
            break;
        case LINK:
        case INLINK:
            ui_apply_but_LINK(C, but, data);
            break;
        case BUT_IMAGE: 
            ui_apply_but_IMAGE(C, but, data);
            break;
        case HISTOGRAM: 
            ui_apply_but_HISTOGRAM(C, but, data);
            break;
        case WAVEFORM:
            ui_apply_but_WAVEFORM(C, but, data);
            break;
        case TRACKPREVIEW:
            ui_apply_but_TRACKPREVIEW(C, but, data);
            break;
        default:
            break;
    }

    but->editstr= editstr;
    but->editval= editval;
    but->editvec= editvec;
    but->editcoba= editcoba;
    but->editcumap= editcumap;
}

/* ******************* drop event ********************  */

/* only call if event type is EVT_DROP */
static void ui_but_drop(bContext *C, wmEvent *event, uiBut *but, uiHandleButtonData *data)
{
    wmDrag *wmd;
    ListBase *drags= event->customdata; /* drop event type has listbase customdata by default */
    
    for(wmd= drags->first; wmd; wmd= wmd->next) {
        if(wmd->type==WM_DRAG_ID) {
            /* align these types with UI_but_active_drop_name */
            if(ELEM3(but->type, TEX, IDPOIN, SEARCH_MENU)) {
                ID *id= (ID *)wmd->poin;
                
                if(but->poin==NULL && but->rnapoin.data==NULL) {}
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
                BLI_strncpy(data->str, id->name+2, data->maxlen);
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
        }
    }
    
}

/* ******************* copy and paste ********************  */

/* c = copy, v = paste */
static void ui_but_copy_paste(bContext *C, uiBut *but, uiHandleButtonData *data, char mode)
{
    static ColorBand but_copypaste_coba = {0};
    char buf[UI_MAX_DRAW_STR+1]= {0};
    double val;
    
    if(mode=='v' && but->lock)
        return;

    if(mode=='v') {
        /* extract first line from clipboard in case of multi-line copies */
        char *p, *pbuf= WM_clipboard_text_get(0);
        p= pbuf;
        if(p) {
            int i = 0;
            while (*p && *p!='\r' && *p!='\n' && i<UI_MAX_DRAW_STR) {
                buf[i++]=*p;
                p++;
            }
            buf[i]= 0;
            MEM_freeN(pbuf);
        }
    }
    
    /* numeric value */
    if ELEM4(but->type, NUM, NUMABS, NUMSLI, HSVSLI) {
        
        if(but->poin==NULL && but->rnapoin.data==NULL);
        else if(mode=='c') {
            if(ui_is_but_float(but))
                BLI_snprintf(buf, sizeof(buf), "%f", ui_get_but_val(but));
            else
                BLI_snprintf(buf, sizeof(buf), "%d", (int)ui_get_but_val(but));

            WM_clipboard_text_set(buf, 0);
        }
        else {
            if (sscanf(buf, " %lf ", &val) == 1) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                data->value= val;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
        }
    }

    /* RGB triple */
    else if(but->type==COL) {
        float rgb[3];
        
        if(but->poin==NULL && but->rnapoin.data==NULL);
        else if(mode=='c') {

            ui_get_but_vectorf(but, rgb);
            BLI_snprintf(buf, sizeof(buf), "[%f, %f, %f]", rgb[0], rgb[1], rgb[2]);
            WM_clipboard_text_set(buf, 0);
            
        }
        else {
            if (sscanf(buf, "[%f, %f, %f]", &rgb[0], &rgb[1], &rgb[2]) == 3) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                ui_set_but_vectorf(but, rgb);
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
        }
    }

    /* text/string and ID data */
    else if(ELEM3(but->type, TEX, IDPOIN, SEARCH_MENU)) {
        uiHandleButtonData *active_data= but->active;

        if(but->poin==NULL && but->rnapoin.data==NULL);
        else if(mode=='c') {
            button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
            BLI_strncpy(buf, active_data->str, UI_MAX_DRAW_STR);
            WM_clipboard_text_set(active_data->str, 0);
            active_data->cancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else {
            button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);

            if(ui_is_but_utf8(but)) BLI_strncpy_utf8(active_data->str, buf, active_data->maxlen);
            else                    BLI_strncpy(active_data->str, buf, active_data->maxlen);

            if(but->type == SEARCH_MENU) {
                /* else uiSearchboxData.active member is not updated [#26856] */
                ui_searchbox_update(C, data->searchbox, but, 1);
            }
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
    }
    /* colorband (not supported by system clipboard) */
    else if(but->type==BUT_COLORBAND) {
        if(mode=='c') {
            if(but->poin==NULL)
                return;

            memcpy(&but_copypaste_coba, but->poin, sizeof(ColorBand));
        }
        else {
            if(but_copypaste_coba.tot==0)
                return;

            if(!but->poin)
                but->poin= MEM_callocN(sizeof(ColorBand), "colorband");

            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
            memcpy(data->coba, &but_copypaste_coba, sizeof(ColorBand) );
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
    }
    /* operator button (any type) */
    else if (but->optype) {
        if(mode=='c') {
            PointerRNA *opptr;
            char *str;
            opptr= uiButGetOperatorPtrRNA(but); /* allocated when needed, the button owns it */

            str= WM_operator_pystring(C, but->optype, opptr, 0);

            WM_clipboard_text_set(str, 0);

            MEM_freeN(str);
        }
    }
}

/* ************* in-button text selection/editing ************* */

/* return 1 if char ch is special character, otherwise return 0 */
static uiButtonDelimType test_special_char(const char ch)
{
    if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')) {
        return BUTTON_DELIM_ALPHA;
    }

    switch(ch) {
        case ',':
        case '.':
            return BUTTON_DELIM_PUNCT;

        case '{':
        case '}':
        case '[':
        case ']':
        case '(':
        case ')':
            return BUTTON_DELIM_BRACE;

        case '+':
        case '-':
        case '=':
        case '~':
        case '%':
        case '/':
        case '<':
        case '>':
        case '^':
        case '*':
        case '&':
            return BUTTON_DELIM_OPERATOR;

        case '\'':
        case '\"': // " - an extra closing one for Aligorith's text editor
            return BUTTON_DELIM_QUOTE;

        case ' ':
            return BUTTON_DELIM_WHITESPACE;

        case '\\':
        case '!':
        case '@':
        case '#':
        case '$':
        case ':':
        case ';':
        case '?':
        case '_':
            return BUTTON_DELIM_OTHER;

        default:
            break;
    }
    return BUTTON_DELIM_NONE;
}

static int ui_textedit_step_next_utf8(const char *str, size_t maxlen, short *pos)
{
    const char *str_end= str + (maxlen + 1);
    const char *str_pos= str + (*pos);
    const char *str_next= BLI_str_find_next_char_utf8(str_pos, str_end);
    if (str_next) {
        (*pos) += (str_next - str_pos);
        if((*pos) > maxlen) (*pos)= maxlen;
        return TRUE;
    }

    return FALSE;
}

static int ui_textedit_step_prev_utf8(const char *str, size_t UNUSED(maxlen), short *pos)
{
    if((*pos) > 0) {
        const char *str_pos= str + (*pos);
        const char *str_prev= BLI_str_find_prev_char_utf8(str, str_pos);
        if (str_prev) {
            (*pos) -= (str_pos - str_prev);
            return TRUE;
        }
    }

    return FALSE;
}

static void ui_textedit_step_utf8(const char *str, size_t maxlen,
                                  short *pos, const char direction,
                                  uiButtonJumpType jump)
{
    const short pos_prev= *pos;

    if(direction) { /* right*/
        if(jump != BUTTON_EDIT_JUMP_NONE) {
            const uiButtonDelimType is_special= (*pos) < maxlen ? test_special_char(str[(*pos)]) : BUTTON_DELIM_NONE;
            /* jump between special characters (/,\,_,-, etc.),
             * look at function test_special_char() for complete
             * list of special character, ctr -> */
            while((*pos) < maxlen) {
                if (ui_textedit_step_next_utf8(str, maxlen, pos)) {
                    if((jump != BUTTON_EDIT_JUMP_ALL) && (is_special != test_special_char(str[(*pos)]))) break;
                }
                else {
                    break; /* unlikely but just incase */
                }
            }
        }
        else {
            ui_textedit_step_next_utf8(str, maxlen, pos);
        }
    }
    else { /* left */
        if(jump != BUTTON_EDIT_JUMP_NONE) {
            const uiButtonDelimType is_special= (*pos) > 1 ? test_special_char(str[(*pos) - 1]) : BUTTON_DELIM_NONE;
            /* left only: compensate for index/change in direction */
            ui_textedit_step_prev_utf8(str, maxlen, pos);

            /* jump between special characters (/,\,_,-, etc.),
             * look at function test_special_char() for complete
             * list of special character, ctr -> */
            while ((*pos) > 0) {
                if (ui_textedit_step_prev_utf8(str, maxlen, pos)) {
                    if((jump != BUTTON_EDIT_JUMP_ALL) && (is_special != test_special_char(str[(*pos)]))) break;
                }
                else {
                    break;
                }
            }

            /* left only: compensate for index/change in direction */
            if(((*pos) != 0) && ABS(pos_prev - (*pos)) > 1) {
                ui_textedit_step_next_utf8(str, maxlen, pos);
            }
        }
        else {
            ui_textedit_step_prev_utf8(str, maxlen, pos);
        }
    }
}

static int ui_textedit_delete_selection(uiBut *but, uiHandleButtonData *data)
{
    char *str= data->str;
    int len= strlen(str);
    int change= 0;
    if(but->selsta != but->selend && len) {
        memmove( str+but->selsta, str+but->selend, (len - but->selend) + 1 );
        change= 1;
    }
    
    but->pos = but->selend = but->selsta;
    return change;
}

/* note, but->block->aspect is used here, when drawing button style is getting scaled too */
static void ui_textedit_set_cursor_pos(uiBut *but, uiHandleButtonData *data, short x)
{
    uiStyle *style= UI_GetStyle();  // XXX pass on as arg
    uiFontStyle *fstyle = &style->widget;
    int startx= but->x1;
    char *origstr;

    uiStyleFontSet(fstyle);

    if (fstyle->kerning==1) /* for BLF_width */
        BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
    
    origstr= MEM_callocN(sizeof(char)*data->maxlen, "ui_textedit origstr");
    
    BLI_strncpy(origstr, but->drawstr, data->maxlen);
    
    /* XXX solve generic */
    if(but->type==NUM || but->type==NUMSLI)
        startx += (int)(0.5f*(but->y2 - but->y1));
    else if(ELEM(but->type, TEX, SEARCH_MENU)) {
        startx += 5;
        if (but->flag & UI_HAS_ICON)
            startx += UI_DPI_ICON_SIZE;
    }
    
    /* mouse dragged outside the widget to the left */
    if (x < startx && but->ofs > 0) {   
        short i= but->ofs;

        origstr[but->ofs] = 0;
        
        while (i > 0) {
            if (ui_textedit_step_prev_utf8(origstr, but->ofs, &i)) {
                if (BLF_width(fstyle->uifont_id, origstr+i) > (startx - x)*0.25f) break;    // 0.25 == scale factor for less sensitivity
            }
            else {
                break; /* unlikely but possible */
            }
        }
        but->ofs = i;
        but->pos = but->ofs;
    }
    /* mouse inside the widget */
    else if (x >= startx) {
        const float aspect_sqrt= sqrtf(but->block->aspect);
        
        but->pos= strlen(origstr)-but->ofs;
        
        /* XXX does not take zoom level into account */
        while (startx + aspect_sqrt * BLF_width(fstyle->uifont_id, origstr+but->ofs) > x) {
            if (but->pos <= 0) break;
            if (ui_textedit_step_prev_utf8(origstr, but->ofs, &but->pos)) {
                origstr[but->pos+but->ofs] = 0;
            }
            else {
                break; /* unlikely but possible */
            }
        }
        but->pos += but->ofs;
        if(but->pos<0) but->pos= 0;
    }
    
    if (fstyle->kerning == 1)
        BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);
    
    MEM_freeN(origstr);
}

static void ui_textedit_set_cursor_select(uiBut *but, uiHandleButtonData *data, short x)
{
    if (x > data->selstartx) data->selextend = EXTEND_RIGHT;
    else if (x < data->selstartx) data->selextend = EXTEND_LEFT;

    ui_textedit_set_cursor_pos(but, data, x);
                        
    if (data->selextend == EXTEND_RIGHT) but->selend = but->pos;
    if (data->selextend == EXTEND_LEFT) but->selsta = but->pos;

    ui_check_but(but);
}

/* this is used for both utf8 and ascii, its meant to be used for single keys,
 * notie the buffer is either copied or not, so its not suitable for pasting in
 * - campbell */
static int ui_textedit_type_buf(uiBut *but, uiHandleButtonData *data,
                                const char *utf8_buf, int utf8_buf_len)
{
    char *str;
    int len, changed= 0;

    str= data->str;
    len= strlen(str);

    if(len-(but->selend - but->selsta)+1 <= data->maxlen) {
        int step= utf8_buf_len;

        /* type over the current selection */
        if ((but->selend - but->selsta) > 0) {
            changed= ui_textedit_delete_selection(but, data);
            len= strlen(str);
        }

        if(len + step < data->maxlen) {
            memmove(&str[but->pos + step], &str[but->pos], (len + 1) - but->pos);
            memcpy(&str[but->pos], utf8_buf, step * sizeof(char));
            but->pos += step;
            changed= 1;
        }
    }

    return changed;
}

static int ui_textedit_type_ascii(uiBut *but, uiHandleButtonData *data, char ascii)
{
    char buf[2]= {ascii, '\0'};

    if (ui_is_but_utf8(but) && (BLI_str_utf8_size(buf) == -1)) {
        printf("%s: entering invalid ascii char into an ascii key (%d)\n",
               __func__, (int)(unsigned char)ascii);

        return 0;
    }

    /* in some cases we want to allow invalid utf8 chars */
    return ui_textedit_type_buf(but, data, buf, 1);
}

static void ui_textedit_move(uiBut *but, uiHandleButtonData *data, int direction, int select, uiButtonJumpType jump)
{
    const char *str= data->str;
    const int len= strlen(str);
    const int pos_prev= but->pos;
    const int has_sel= (but->selend - but->selsta) > 0;

    /* special case, quit selection and set cursor */
    if (has_sel && !select) {
        if (jump == BUTTON_EDIT_JUMP_ALL) {
            but->selsta = but->selend= but->pos = direction ? len : 0;
        }
        else {
            if (direction) {
                but->selsta = but->pos = but->selend;
            }
            else {
                but->pos = but->selend = but->selsta;
            }
        }
        data->selextend = 0;
    }
    else {
        ui_textedit_step_utf8(str, len, &but->pos, direction, jump);

        if(select) {
            /* existing selection */
            if (has_sel) {

                if(data->selextend == 0) {
                    data->selextend= EXTEND_RIGHT;
                }

                if (direction) {
                    if (data->selextend == EXTEND_RIGHT) {
                        but->selend= but->pos;
                    }
                    else {
                        but->selsta= but->pos;
                    }
                }
                else {
                    if (data->selextend == EXTEND_LEFT) {
                        but->selsta= but->pos;
                    }
                    else {
                        but->selend= but->pos;
                    }
                }

                if (but->selend < but->selsta) {
                    SWAP(short, but->selsta, but->selend);
                    data->selextend= (data->selextend == EXTEND_RIGHT) ? EXTEND_LEFT : EXTEND_RIGHT;
                }

            } /* new selection */
            else {
                if (direction) {
                    data->selextend= EXTEND_RIGHT;
                    but->selend= but->pos;
                    but->selsta= pos_prev;
                }
                else {
                    data->selextend= EXTEND_LEFT;
                    but->selend= pos_prev;
                    but->selsta= but->pos;
                }
            }
        }
    }
}

static int ui_textedit_delete(uiBut *but, uiHandleButtonData *data, int direction, uiButtonJumpType jump)
{
    char *str= data->str;
    const int len= strlen(str);

    int changed= 0;

    if(jump == BUTTON_EDIT_JUMP_ALL) {
        if(len) changed=1;
        str[0]= '\0';
        but->pos= 0;
    }
    else if(direction) { /* delete */
        if ((but->selend - but->selsta) > 0) {
            changed= ui_textedit_delete_selection(but, data);
        }
        else if (but->pos>=0 && but->pos<len) {
            short pos= but->pos;
            int step;
            ui_textedit_step_utf8(str, len, &pos, direction, jump);
            step= pos - but->pos;
            memmove(&str[but->pos], &str[but->pos + step], (len + 1) - but->pos);
            changed= 1;
        }
    }
    else { /* backspace */
        if (len != 0) {
            if ((but->selend - but->selsta) > 0) {
                changed= ui_textedit_delete_selection(but, data);
            }
            else if(but->pos>0) {
                short pos= but->pos;
                int step;

                ui_textedit_step_utf8(str, len, &pos, direction, jump);
                step= but->pos - pos;
                memmove(&str[but->pos - step], &str[but->pos], (len + 1) - but->pos);
                but->pos -= step;
                changed= 1;
            }
        } 
    }

    return changed;
}

static int ui_textedit_autocomplete(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    char *str;
    int changed= 1;

    str= data->str;

    if(data->searchbox)
        ui_searchbox_autocomplete(C, data->searchbox, but, data->str);
    else
        but->autocomplete_func(C, str, but->autofunc_arg);

    but->pos= strlen(str);
    but->selsta= but->selend= but->pos;

    return changed;
}

static int ui_textedit_copypaste(uiBut *but, uiHandleButtonData *data, int paste, int copy, int cut)
{
    char buf[UI_MAX_DRAW_STR]={0};
    char *str, *p, *pbuf;
    int len, x, i, changed= 0;

    str= data->str;
    len= strlen(str);
    
    /* paste */
    if (paste) {
        /* extract the first line from the clipboard */
        p = pbuf= WM_clipboard_text_get(0);

        if(p && p[0]) {
            unsigned int y;
            i= 0;
            while (*p && *p!='\r' && *p!='\n' && i<UI_MAX_DRAW_STR-1) {
                buf[i++]=*p;
                p++;
            }
            buf[i]= 0;

            /* paste over the current selection */
            if ((but->selend - but->selsta) > 0) {
                ui_textedit_delete_selection(but, data);
                len= strlen(str);
            }
            
            for (y=0; y<strlen(buf); y++)
            {
                /* add contents of buffer */
                if(len+1 < data->maxlen) {
                    for(x= data->maxlen; x>but->pos; x--)
                        str[x]= str[x-1];
                    str[but->pos]= buf[y];
                    but->pos++; 
                    len++;
                    str[len]= '\0';
                }
            }

            changed= 1;
        }

        if(pbuf)
            MEM_freeN(pbuf);
    }
    /* cut & copy */
    else if (copy || cut) {
        /* copy the contents to the copypaste buffer */
        for(x= but->selsta; x <= but->selend; x++) {
            if (x==but->selend)
                buf[x] = '\0';
            else
                buf[(x - but->selsta)] = str[x];
        }

        WM_clipboard_text_set(buf, 0);
        
        /* for cut only, delete the selection afterwards */
        if(cut)
            if((but->selend - but->selsta) > 0)
                changed= ui_textedit_delete_selection(but, data);
    } 

    return changed;
}

static void ui_textedit_begin(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    if(data->str) {
        MEM_freeN(data->str);
        data->str= NULL;
    }

    /* retrieve string */
    data->maxlen= ui_get_but_string_max_length(but);
    data->str= MEM_callocN(sizeof(char)*data->maxlen + 1, "textedit str");
    ui_get_but_string(but, data->str, data->maxlen);

    if(ELEM3(but->type, NUM, NUMABS, NUMSLI)) {
        ui_convert_to_unit_alt_name(but, data->str, data->maxlen);
    }

    data->origstr= BLI_strdup(data->str);
    data->selextend= 0;
    data->selstartx= 0;

    /* set cursor pos to the end of the text */
    but->editstr= data->str;
    but->pos= strlen(data->str);
    but->selsta= 0;
    but->selend= strlen(data->str);

    /* optional searchbox */
    if(but->type==SEARCH_MENU) {
        data->searchbox= ui_searchbox_create(C, data->region, but);
        ui_searchbox_update(C, data->searchbox, but, 1); /* 1= reset */
    }
    
    ui_check_but(but);
    
    WM_cursor_modal(CTX_wm_window(C), BC_TEXTEDITCURSOR);
}

static void ui_textedit_end(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    if(but) {
        if(ui_is_but_utf8(but)) {
            int strip= BLI_utf8_invalid_strip(but->editstr, strlen(but->editstr));
            /* not a file?, strip non utf-8 chars */
            if(strip) {
                /* wont happen often so isnt that annoying to keep it here for a while */
                printf("%s: invalid utf8 - stripped chars %d\n", __func__, strip);
            }
        }
        
        if(data->searchbox) {
            if(data->cancel==0)
                ui_searchbox_apply(but, data->searchbox);

            ui_searchbox_free(C, data->searchbox);
            data->searchbox= NULL;
        }
        
        but->editstr= NULL;
        but->pos= -1;
    }
    
    WM_cursor_restore(CTX_wm_window(C));
}

static void ui_textedit_next_but(uiBlock *block, uiBut *actbut, uiHandleButtonData *data)
{
    uiBut *but;

    /* label and roundbox can overlap real buttons (backdrops...) */
    if(ELEM4(actbut->type, LABEL, SEPR, ROUNDBOX, LISTBOX))
        return;

    for(but= actbut->next; but; but= but->next) {
        if(ELEM7(but->type, TEX, NUM, NUMABS, NUMSLI, HSVSLI, IDPOIN, SEARCH_MENU)) {
            if(!(but->flag & UI_BUT_DISABLED)) {
                data->postbut= but;
                data->posttype= BUTTON_ACTIVATE_TEXT_EDITING;
                return;
            }
        }
    }
    for(but= block->buttons.first; but!=actbut; but= but->next) {
        if(ELEM7(but->type, TEX, NUM, NUMABS, NUMSLI, HSVSLI, IDPOIN, SEARCH_MENU)) {
            if(!(but->flag & UI_BUT_DISABLED)) {
                data->postbut= but;
                data->posttype= BUTTON_ACTIVATE_TEXT_EDITING;
                return;
            }
        }
    }
}

static void ui_textedit_prev_but(uiBlock *block, uiBut *actbut, uiHandleButtonData *data)
{
    uiBut *but;

    /* label and roundbox can overlap real buttons (backdrops...) */
    if(ELEM4(actbut->type, LABEL, SEPR, ROUNDBOX, LISTBOX))
        return;

    for(but= actbut->prev; but; but= but->prev) {
        if(ELEM7(but->type, TEX, NUM, NUMABS, NUMSLI, HSVSLI, IDPOIN, SEARCH_MENU)) {
            if(!(but->flag & UI_BUT_DISABLED)) {
                data->postbut= but;
                data->posttype= BUTTON_ACTIVATE_TEXT_EDITING;
                return;
            }
        }
    }
    for(but= block->buttons.last; but!=actbut; but= but->prev) {
        if(ELEM7(but->type, TEX, NUM, NUMABS, NUMSLI, HSVSLI, IDPOIN, SEARCH_MENU)) {
            if(!(but->flag & UI_BUT_DISABLED)) {
                data->postbut= but;
                data->posttype= BUTTON_ACTIVATE_TEXT_EDITING;
                return;
            }
        }
    }
}


static void ui_do_but_textedit(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my, changed= 0, inbox=0, update= 0, retval= WM_UI_HANDLER_CONTINUE;

    switch(event->type) {
        case WHEELUPMOUSE:
        case WHEELDOWNMOUSE:
        case MOUSEMOVE:
            if(data->searchbox)
                ui_searchbox_event(C, data->searchbox, but, event);
            
            break;
        case RIGHTMOUSE:
        case ESCKEY:
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            retval= WM_UI_HANDLER_BREAK;
            break;
        case LEFTMOUSE: {
            
            /* exit on LMB only on RELEASE for searchbox, to mimic other popups, and allow multiple menu levels */
            if(data->searchbox)
                inbox= ui_searchbox_inside(data->searchbox, event->x, event->y);

            if(event->val==KM_PRESS) {
                mx= event->x;
                my= event->y;
                ui_window_to_block(data->region, block, &mx, &my);

                if (ui_but_contains_pt(but, mx, my)) {
                    ui_textedit_set_cursor_pos(but, data, mx);
                    but->selsta = but->selend = but->pos;
                    data->selstartx= mx;

                    button_activate_state(C, but, BUTTON_STATE_TEXT_SELECTING);
                    retval= WM_UI_HANDLER_BREAK;
                }
                else if(inbox==0) {
                    /* if searchbox, click outside will cancel */
                    if(data->searchbox)
                        data->cancel= data->escapecancel= 1;
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
                    retval= WM_UI_HANDLER_BREAK;
                }
            }
            else if(inbox) {
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                retval= WM_UI_HANDLER_BREAK;
            }
            break;
        }
    }

    if(event->val==KM_PRESS) {
        switch (event->type) {
            case VKEY:
            case XKEY:
            case CKEY:
                if(event->ctrl || event->oskey) {
                    if(event->type == VKEY)
                        changed= ui_textedit_copypaste(but, data, 1, 0, 0);
                    else if(event->type == CKEY)
                        changed= ui_textedit_copypaste(but, data, 0, 1, 0);
                    else if(event->type == XKEY)
                        changed= ui_textedit_copypaste(but, data, 0, 0, 1);

                    retval= WM_UI_HANDLER_BREAK;
                }
                break;
            case RIGHTARROWKEY:
                ui_textedit_move(but, data, 1, event->shift, event->ctrl ? BUTTON_EDIT_JUMP_DELIM : BUTTON_EDIT_JUMP_NONE);
                retval= WM_UI_HANDLER_BREAK;
                break;
            case LEFTARROWKEY:
                ui_textedit_move(but, data, 0, event->shift, event->ctrl ? BUTTON_EDIT_JUMP_DELIM : BUTTON_EDIT_JUMP_NONE);
                retval= WM_UI_HANDLER_BREAK;
                break;
            case DOWNARROWKEY:
                if(data->searchbox) {
                    ui_searchbox_event(C, data->searchbox, but, event);
                    break;
                }
                /* pass on purposedly */
            case ENDKEY:
                ui_textedit_move(but, data, 1, event->shift, BUTTON_EDIT_JUMP_ALL);
                retval= WM_UI_HANDLER_BREAK;
                break;
            case UPARROWKEY:
                if(data->searchbox) {
                    ui_searchbox_event(C, data->searchbox, but, event);
                    break;
                }
                /* pass on purposedly */
            case HOMEKEY:
                ui_textedit_move(but, data, 0, event->shift, BUTTON_EDIT_JUMP_ALL);
                retval= WM_UI_HANDLER_BREAK;
                break;
            case PADENTER:
            case RETKEY:
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                retval= WM_UI_HANDLER_BREAK;
                break;
            case DELKEY:
                changed= ui_textedit_delete(but, data, 1, event->ctrl ? BUTTON_EDIT_JUMP_DELIM : BUTTON_EDIT_JUMP_NONE);
                retval= WM_UI_HANDLER_BREAK;
                break;

            case BACKSPACEKEY:
                changed= ui_textedit_delete(but, data, 0, event->shift ? BUTTON_EDIT_JUMP_ALL :  (event->ctrl ? BUTTON_EDIT_JUMP_DELIM : BUTTON_EDIT_JUMP_NONE));
                retval= WM_UI_HANDLER_BREAK;
                break;
                
            case TABKEY:
                /* there is a key conflict here, we can't tab with autocomplete */
                if(but->autocomplete_func || data->searchbox) {
                    changed= ui_textedit_autocomplete(C, but, data);
                    update= 1; /* do live update for tab key */
                }
                /* the hotkey here is not well defined, was G.qual so we check all */
                else if(event->shift || event->ctrl || event->alt || event->oskey) {
                    ui_textedit_prev_but(block, but, data);
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
                }
                else {
                    ui_textedit_next_but(block, but, data);
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
                }
                retval= WM_UI_HANDLER_BREAK;
                break;
        }

        if((event->ascii || event->utf8_buf[0]) && (retval == WM_UI_HANDLER_CONTINUE)) {
            char ascii = event->ascii;
            const char *utf8_buf= event->utf8_buf;

            /* exception that's useful for number buttons, some keyboard
               numpads have a comma instead of a period */
            if(ELEM3(but->type, NUM, NUMABS, NUMSLI)) { /* could use data->min*/
                if(event->type == PADPERIOD && ascii == ',') {
                    ascii = '.';
                    utf8_buf= NULL; /* force ascii fallback */
                }
            }

            if(utf8_buf && utf8_buf[0]) {
                int utf8_buf_len= BLI_str_utf8_size(utf8_buf);
                /* keep this printf until utf8 is well tested */
                if (utf8_buf_len != 1) {
                    printf("%s: utf8 char '%.*s'\n", __func__, utf8_buf_len, utf8_buf);
                }

                // strcpy(utf8_buf, "12345");
                changed= ui_textedit_type_buf(but, data, event->utf8_buf, utf8_buf_len);
            }
            else {
                changed= ui_textedit_type_ascii(but, data, ascii);
            }

            retval= WM_UI_HANDLER_BREAK;
            
        }
        /* textbutton with magnifier icon: do live update for search button */
        if(but->icon==ICON_VIEWZOOM)
            update= 1;
    }

    if(changed) {
        /* only update when typing for TAB key */
        if(update && data->interactive) ui_apply_button(C, block, but, data, 1);
        else ui_check_but(but);
        but->changed= TRUE;
        
        if(data->searchbox)
            ui_searchbox_update(C, data->searchbox, but, 1); /* 1 = reset */
    }

    if(changed || (retval == WM_UI_HANDLER_BREAK))
        ED_region_tag_redraw(data->region);
}

static void ui_do_but_textedit_select(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my, retval= WM_UI_HANDLER_CONTINUE;

    switch(event->type) {
        case MOUSEMOVE: {
            mx= event->x;
            my= event->y;
            ui_window_to_block(data->region, block, &mx, &my);

            ui_textedit_set_cursor_select(but, data, mx);
            retval= WM_UI_HANDLER_BREAK;
            break;
        }
        case LEFTMOUSE:
            if(event->val == KM_RELEASE)
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
            retval= WM_UI_HANDLER_BREAK;
            break;
    }

    if(retval == WM_UI_HANDLER_BREAK) {
        ui_check_but(but);
        ED_region_tag_redraw(data->region);
    }
}

/* ************* number editing for various types ************* */

static void ui_numedit_begin(uiBut *but, uiHandleButtonData *data)
{
    if(but->type == BUT_CURVE) {
        but->editcumap= (CurveMapping*)but->poin;
    }
    else if(but->type == BUT_COLORBAND) {
        data->coba= (ColorBand*)but->poin;
        but->editcoba= data->coba;
    }
    else if(ELEM3(but->type, BUT_NORMAL, HSVCUBE, HSVCIRCLE)) {
        ui_get_but_vectorf(but, data->origvec);
        copy_v3_v3(data->vec, data->origvec);
        but->editvec= data->vec;
    }
    else {
        float softrange, softmin, softmax;

        data->startvalue= ui_get_but_val(but);
        data->origvalue= data->startvalue;
        data->value= data->origvalue;
        but->editval= &data->value;

        softmin= but->softmin;
        softmax= but->softmax;
        softrange= softmax - softmin;

        data->dragfstart= (softrange == 0.0f)? 0.0f: ((float)data->value - softmin)/softrange;
        data->dragf= data->dragfstart;
    }

    data->dragchange= 0;
    data->draglock= 1;
}

static void ui_numedit_end(uiBut *but, uiHandleButtonData *data)
{
    but->editval= NULL;
    but->editvec= NULL;
    but->editcoba= NULL;
    but->editcumap= NULL;

    data->dragstartx= 0;
    data->draglastx= 0;
    data->dragchange= 0;
    data->dragcbd= NULL;
    data->dragsel= 0;
}

static void ui_numedit_apply(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data)
{
    if(data->interactive) ui_apply_button(C, block, but, data, 1);
    else ui_check_but(but);

    ED_region_tag_redraw(data->region);
}

/* ****************** menu opening for various types **************** */

static void ui_blockopen_begin(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    uiBlockCreateFunc func= NULL;
    uiBlockHandleCreateFunc handlefunc= NULL;
    uiMenuCreateFunc menufunc= NULL;
    char *menustr= NULL;
    void *arg= NULL;

    switch(but->type) {
        case BLOCK:
        case PULLDOWN:
            if(but->menu_create_func) {
                menufunc= but->menu_create_func;
                arg= but->poin;
            }
            else {
                func= but->block_create_func;
                arg= but->poin?but->poin:but->func_argN;
            }
            break;
        case MENU:
            if(but->menu_create_func) {
                menufunc= but->menu_create_func;
                arg= but->poin;
            }
            else {
                data->origvalue= ui_get_but_val(but);
                data->value= data->origvalue;
                but->editval= &data->value;

                menustr= but->str;
            }
            break;
        case ICONROW:
            menufunc= ui_block_func_ICONROW;
            arg= but;
            break;
        case ICONTEXTROW:
            menufunc= ui_block_func_ICONTEXTROW;
            arg= but;
            break;
        case COL:
            ui_get_but_vectorf(but, data->origvec);
            copy_v3_v3(data->vec, data->origvec);
            but->editvec= data->vec;

            handlefunc= ui_block_func_COL;
            arg= but;
            break;
    }

    if(func || handlefunc) {
        data->menu= ui_popup_block_create(C, data->region, but, func, handlefunc, arg);
        if(but->block->handle)
            data->menu->popup= but->block->handle->popup;
    }
    else if(menufunc || menustr) {
        data->menu= ui_popup_menu_create(C, data->region, but, menufunc, arg, menustr);
        if(but->block->handle)
            data->menu->popup= but->block->handle->popup;
    }

    /* this makes adjacent blocks auto open from now on */
    //if(but->block->auto_open==0) but->block->auto_open= 1;
}

static void ui_blockopen_end(bContext *C, uiBut *but, uiHandleButtonData *data)
{
    if(but) {
        but->editval= NULL;
        but->editvec= NULL;

        but->block->auto_open_last= PIL_check_seconds_timer();
    }

    if(data->menu) {
        ui_popup_block_free(C, data->menu);
        data->menu= NULL;
    }
}

/* ***************** events for different button types *************** */

static int ui_do_but_BUT(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type == LEFTMOUSE && event->val==KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_WAIT_RELEASE);
            return WM_UI_HANDLER_BREAK;
        }
        else if(event->type == LEFTMOUSE && but->block->handle) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
        else if(ELEM(event->type, PADENTER, RETKEY) && event->val==KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_WAIT_FLASH);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_RELEASE) {
        if(event->type == LEFTMOUSE && event->val!=KM_PRESS) {
            if(!(but->flag & UI_SELECT))
                data->cancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_HOTKEYEVT(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val==KM_PRESS) {
            but->drawstr[0]= 0;
            but->modifier_key= 0;
            button_activate_state(C, but, BUTTON_STATE_WAIT_KEY_EVENT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_KEY_EVENT) {
        
        if(event->type == MOUSEMOVE)
            return WM_UI_HANDLER_CONTINUE;
        
        if(event->type == LEFTMOUSE && event->val==KM_PRESS) {
            /* only cancel if click outside the button */
            if(ui_mouse_inside_button(but->active->region, but, event->x, event->y) == 0) {
                /* data->cancel doesnt work, this button opens immediate */
                if(but->flag & UI_BUT_IMMEDIATE)
                    ui_set_but_val(but, 0);
                else
                    data->cancel= 1;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                return WM_UI_HANDLER_BREAK;
            }
        }
        
        /* always set */
        but->modifier_key = 0;
        if(event->shift) but->modifier_key |= KM_SHIFT;
        if(event->alt)   but->modifier_key |= KM_ALT;
        if(event->ctrl)  but->modifier_key |= KM_CTRL;
        if(event->oskey) but->modifier_key |= KM_OSKEY;

        ui_check_but(but);
        ED_region_tag_redraw(data->region);
            
        if(event->val==KM_PRESS) {
            if(ISHOTKEY(event->type)) { 
                
                if(WM_key_event_string(event->type)[0])
                    ui_set_but_val(but, event->type);
                else
                    data->cancel= 1;
                
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                return WM_UI_HANDLER_BREAK;
            }
            else if(event->type == ESCKEY) {
                data->cancel= 1;
                data->escapecancel= 1;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
            
        }
    }
    
    return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_KEYEVT(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val==KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_WAIT_KEY_EVENT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_KEY_EVENT) {
        if(event->type == MOUSEMOVE)
            return WM_UI_HANDLER_CONTINUE;

        if(event->val==KM_PRESS) {
            if(WM_key_event_string(event->type)[0])
                ui_set_but_val(but, event->type);
            else
                data->cancel= 1;

            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_TEX(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(ELEM(event->type, LEFTMOUSE, EVT_BUT_OPEN) && event->val==KM_PRESS) {
            if(but->dt == UI_EMBOSSN && !event->ctrl);
            else {
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
                return WM_UI_HANDLER_BREAK;
            }
        }
    }
    else if(data->state == BUTTON_STATE_TEXT_EDITING) {
        ui_do_but_textedit(C, block, but, data, event);
        return WM_UI_HANDLER_BREAK;
    }
    else if(data->state == BUTTON_STATE_TEXT_SELECTING) {
        ui_do_but_textedit_select(C, block, but, data, event);
        return WM_UI_HANDLER_BREAK;
    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_TOG(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val==KM_PRESS) {
            data->togdual= event->ctrl;
            data->togonly= !event->shift;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_EXIT(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    
    if(data->state == BUTTON_STATE_HIGHLIGHT) {

        /* first handle click on icondrag type button */
        if(event->type==LEFTMOUSE && but->dragpoin) {
            if(ui_but_mouse_inside_icon(but, data->region, event)) {
                
                /* tell the button to wait and keep checking further events to
                 * see if it should start dragging */
                button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
                data->dragstartx= event->x;
                data->dragstarty= event->y;
                return WM_UI_HANDLER_CONTINUE;
            }
        }
        
        if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val==KM_PRESS) {
            int ret = WM_UI_HANDLER_BREAK;
            /* XXX (a bit ugly) Special case handling for filebrowser drag button */
            if(but->dragpoin && but->imb && ui_but_mouse_inside_icon(but, data->region, event)) {
                ret = WM_UI_HANDLER_CONTINUE;
            }
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return ret;
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_DRAG) {
        
        /* this function also ends state */
        if(ui_but_start_drag(C, but, data, event)) {
            return WM_UI_HANDLER_BREAK;
        }
        
        /* If the mouse has been pressed and released, getting to 
         * this point without triggering a drag, then clear the 
         * drag state for this button and continue to pass on the event */
        if(event->type==LEFTMOUSE && event->val==KM_RELEASE) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_CONTINUE;
        }
        
        /* while waiting for a drag to be triggered, always block 
         * other events from getting handled */
        return WM_UI_HANDLER_BREAK;
    }
    
    return WM_UI_HANDLER_CONTINUE;
}

/* var names match ui_numedit_but_NUM */
static float ui_numedit_apply_snapf(uiBut *but, float tempf, float softmin, float softmax, float softrange, int snap)
{
    if(tempf==softmin || tempf==softmax || snap==0) {
        /* pass */
    }
    else {
        float fac= 1.0f;
        
        if(ui_is_but_unit(but)) {
            UnitSettings *unit= but->block->unit;
            int unit_type= uiButGetUnitType(but)>>16;

            if(bUnit_IsValid(unit->system, unit_type)) {
                fac= (float)bUnit_BaseScalar(unit->system, unit_type);
                if(ELEM3(unit_type, B_UNIT_LENGTH, B_UNIT_AREA, B_UNIT_VOLUME)) {
                    fac /= unit->scale_length;
                }
            }
        }

        if(fac != 1.0f) {
            /* snap in unit-space */
            tempf /= fac;
            /* softmin /= fac; */ /* UNUSED */
            /* softmax /= fac; */ /* UNUSED */
            softrange /= fac;
        }

        if(snap==1) {
            if(softrange < 2.10f) tempf= 0.1f*floorf(10.0f*tempf);
            else if(softrange < 21.0f) tempf= floorf(tempf);
            else tempf= 10.0f*floorf(tempf/10.0f);
        }
        else if(snap==2) {
            if(softrange < 2.10f) tempf= 0.01f*floorf(100.0f*tempf);
            else if(softrange < 21.0f) tempf= 0.1f*floorf(10.0f*tempf);
            else tempf= floor(tempf);
        }
        
        if(fac != 1.0f)
            tempf *= fac;
    }

    return tempf;
}

static float ui_numedit_apply_snap(int temp, float softmin, float softmax, int snap)
{
    if(temp==softmin || temp==softmax)
        return temp;

    switch(snap) {
    case 0:
        break;
    case 1:
        temp= 10*(temp/10);
        break;
    case 2:
        temp= 100*(temp/100);
        break;
    }

    return temp;
}

static int ui_numedit_but_NUM(uiBut *but, uiHandleButtonData *data, float fac, int snap, int mx)
{
    float deler, tempf, softmin, softmax, softrange;
    int lvalue, temp, changed= 0;
    
    if(mx == data->draglastx)
        return changed;
    
    /* drag-lock - prevent unwanted scroll adjustments */
    /* change value (now 3) to adjust threshold in pixels */
    if(data->draglock) {
        if(abs(mx-data->dragstartx) <= 3)
            return changed;

        data->draglock= 0;
        data->dragstartx= mx;  /* ignore mouse movement within drag-lock */
    }

    softmin= but->softmin;
    softmax= but->softmax;
    softrange= softmax - softmin;

    if(ui_is_a_warp_but(but)) {
        /* Mouse location isn't screen clamped to the screen so use a linear mapping
         * 2px == 1-int, or 1px == 1-ClickStep */
        if(ui_is_but_float(but)) {
            fac *= 0.01f*but->a1;
            tempf = (float)data->startvalue + ((float)(mx - data->dragstartx) * fac);
            tempf= ui_numedit_apply_snapf(but, tempf, softmin, softmax, softrange, snap);

#if 1       /* fake moving the click start, nicer for dragging back after passing the limit */
            if(tempf < softmin) {
                data->dragstartx -= (softmin-tempf) / fac;
                tempf= softmin;
            } else if (tempf > softmax) {
                data->dragstartx += (tempf-softmax) / fac;
                tempf= softmax;
            }
#else
            CLAMP(tempf, softmin, softmax);
#endif

            if(tempf != (float)data->value) {
                data->dragchange= 1;
                data->value= tempf;
                changed= 1;
            }
        }
        else {
            if(softrange > 256)     fac= 1.0;       /* 1px == 1 */
            else if(softrange > 32) fac= 1.0/2.0;   /* 2px == 1 */
            else                    fac= 1.0/16.0;  /* 16px == 1? */

            temp= data->startvalue + (((double)mx - data->dragstartx) * (double)fac);
            temp= ui_numedit_apply_snap(temp, softmin, softmax, snap);

#if 1       /* fake moving the click start, nicer for dragging back after passing the limit */
            if(temp < softmin) {
                data->dragstartx -= (softmin-temp) / fac;
                temp= softmin;
            } else if (temp > softmax) {
                data->dragstartx += (temp-softmax) / fac;
                temp= softmax;
            }
#else
            CLAMP(temp, softmin, softmax);
#endif

            if(temp != data->value) {
                data->dragchange= 1;
                data->value= temp;
                changed= 1;
            }
        }

        data->draglastx= mx;
    }
    else {
        /* Use a non-linear mapping of the mouse drag especially for large floats (normal behavior) */
        deler= 500;
        if(!ui_is_but_float(but)) {
            /* prevent large ranges from getting too out of control */
            if (softrange > 600) deler = powf(softrange, 0.75);
            
            if (softrange < 100) deler= 200.0;
            if (softrange < 25) deler= 50.0;
        }
        deler /= fac;

        if(softrange > 11) {
            /* non linear change in mouse input- good for high precicsion */
            data->dragf+= (((float)(mx-data->draglastx))/deler) * (fabsf(data->dragstartx-mx)*0.002f);
        } else if (softrange > 129) { /* only scale large int buttons */
            /* non linear change in mouse input- good for high precicsionm ints need less fine tuning */
            data->dragf+= (((float)(mx-data->draglastx))/deler) * (fabsf(data->dragstartx-mx)*0.004f);
        } else {
            /*no scaling */
            data->dragf+= ((float)(mx-data->draglastx))/deler ;
        }
    
        CLAMP(data->dragf, 0.0f, 1.0f);
        data->draglastx= mx;
        tempf= (softmin + data->dragf*softrange);


        if(!ui_is_but_float(but)) {
            temp= floorf(tempf + 0.5f);

            temp= ui_numedit_apply_snap(temp, softmin, softmax, snap);

            CLAMP(temp, softmin, softmax);
            lvalue= (int)data->value;
            
            if(temp != lvalue) {
                data->dragchange= 1;
                data->value= (double)temp;
                changed= 1;
            }
        }
        else {
            temp= 0;
            tempf= ui_numedit_apply_snapf(but, tempf, softmin, softmax, softrange, snap);

            CLAMP(tempf, softmin, softmax);

            if(tempf != (float)data->value) {
                data->dragchange= 1;
                data->value= tempf;
                changed= 1;
            }
        }
    }


    return changed;
}

static int ui_do_but_NUM(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my; /* mouse location scaled to fit the UI */
    int screen_mx, screen_my; /* mouse location kept at screen pixel coords */
    int click= 0;
    int retval= WM_UI_HANDLER_CONTINUE;
    
    mx= screen_mx= event->x;
    my= screen_my= event->y;

    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        /* XXX hardcoded keymap check.... */
        if(event->type == WHEELDOWNMOUSE && event->alt) {
            mx= but->x1;
            click= 1;
        }
        else if(event->type == WHEELUPMOUSE && event->alt) {
            mx= but->x2;
            click= 1;
        }
        else if(event->val==KM_PRESS) {
            if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->ctrl) {
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
                retval= WM_UI_HANDLER_BREAK;
            }
            else if(event->type == LEFTMOUSE) {
                data->dragstartx= data->draglastx= ui_is_a_warp_but(but) ? screen_mx:mx;
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                retval= WM_UI_HANDLER_BREAK;
            }
            else if(ELEM(event->type, PADENTER, RETKEY) && event->val==KM_PRESS)
                click= 1;
            else if (event->type == MINUSKEY && event->val==KM_PRESS) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                data->value = -data->value;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                retval= WM_UI_HANDLER_BREAK;
            }
        }
        
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == LEFTMOUSE && event->val!=KM_PRESS) {
            if(data->dragchange)
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            else
                click= 1;
        }
        else if(event->type == MOUSEMOVE) {
            float fac;
            int snap;

            fac= 1.0f;
            if(event->shift) fac /= 10.0f;
            if(event->alt) fac /= 20.0f;
            
            snap= (event->ctrl)? (event->shift)? 2: 1: 0;

            if(ui_numedit_but_NUM(but, data, fac, snap, (ui_is_a_warp_but(but) ? screen_mx:mx)))
                ui_numedit_apply(C, block, but, data);
        }
        retval= WM_UI_HANDLER_BREAK;
    }
    else if(data->state == BUTTON_STATE_TEXT_EDITING) {
        ui_do_but_textedit(C, block, but, data, event);
        retval= WM_UI_HANDLER_BREAK;
    }
    else if(data->state == BUTTON_STATE_TEXT_SELECTING) {
        ui_do_but_textedit_select(C, block, but, data, event);
        retval= WM_UI_HANDLER_BREAK;
    }
    
    if(click) {
        /* we can click on the side arrows to increment/decrement,
         * or click inside to edit the value directly */
        float tempf, softmin, softmax;
        int temp;

        softmin= but->softmin;
        softmax= but->softmax;

        if(!ui_is_but_float(but)) {
            if(mx < (but->x1 + (but->x2 - but->x1)/3 - 3)) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

                temp= (int)data->value - 1;
                if(temp>=softmin && temp<=softmax)
                    data->value= (double)temp;
                else
                    data->cancel= 1;

                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
            else if(mx > (but->x1 + (2*(but->x2 - but->x1)/3) + 3)) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

                temp= (int)data->value + 1;
                if(temp>=softmin && temp<=softmax)
                    data->value= (double)temp;
                else
                    data->cancel= 1;

                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
            else
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
        }
        else {
            if(mx < (but->x1 + (but->x2 - but->x1)/3 - 3)) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

                tempf= (float)data->value - 0.01f * but->a1;
                if (tempf < softmin) tempf = softmin;
                data->value= tempf;

                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
            else if(mx > but->x1 + (2*((but->x2 - but->x1)/3) + 3)) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

                tempf= (float)data->value + 0.01f * but->a1;
                if (tempf > softmax) tempf = softmax;
                data->value= tempf;

                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
            else
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
        }

        retval= WM_UI_HANDLER_BREAK;
    }
    
    return retval;
}

static int ui_numedit_but_SLI(uiBut *but, uiHandleButtonData *data, int shift, int ctrl, int mx)
{
    float deler, f, tempf, softmin, softmax, softrange;
    int temp, lvalue, changed= 0;

    softmin= but->softmin;
    softmax= but->softmax;
    softrange= softmax - softmin;

    if(but->type==NUMSLI) deler= ((but->x2-but->x1) - 5.0f*but->aspect);
    else if(but->type==HSVSLI) deler= ((but->x2-but->x1)/2.0f - 5.0f*but->aspect);
    else if(but->type==SCROLL) {
        int horizontal= (but->x2 - but->x1 > but->y2 - but->y1);
        float size= (horizontal)? (but->x2-but->x1): -(but->y2-but->y1);
        deler= size*(but->softmax - but->softmin)/(but->softmax - but->softmin + but->a1);
    }
    else deler= (but->x2-but->x1- 5.0f*but->aspect);

    f= (float)(mx-data->dragstartx)/deler + data->dragfstart;
    
    if(shift)
        f= (f-data->dragfstart)/10.0f + data->dragfstart;

    CLAMP(f, 0.0f, 1.0f);
    tempf= softmin + f*softrange;
    temp= floorf(tempf+0.5f);

    if(ctrl) {
        if(tempf==softmin || tempf==softmax);
        else if(ui_is_but_float(but)) {

            if(shift) {
                if(tempf==softmin || tempf==softmax);
                else if(softmax-softmin < 2.10f) tempf= 0.01f * floorf(100.0f*tempf);
                else if(softmax-softmin < 21.0f) tempf= 0.1f * floorf(10.0f*tempf);
                else tempf= floorf(tempf);
            }
            else {
                if(softmax-softmin < 2.10f) tempf= 0.1f * floorf(10.0f*tempf);
                else if(softmax-softmin < 21.0f) tempf= floorf(tempf);
                else tempf= 10.0f*floorf(tempf/10.0f);
            }
        }
        else {
            temp= 10*(temp/10);
            tempf= temp;
        }
    }

    if(!ui_is_but_float(but)) {
        lvalue= floor(data->value+0.5);

        CLAMP(temp, softmin, softmax);

        if(temp != lvalue) {
            data->value= temp;
            data->dragchange= 1;
            changed= 1;
        }
    }
    else {
        CLAMP(tempf, softmin, softmax);

        if(tempf != (float)data->value) {
            data->value= tempf;
            data->dragchange= 1;
            changed= 1;
        }
    }

    return changed;
}

static int ui_do_but_SLI(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my, click= 0;
    int retval= WM_UI_HANDLER_CONTINUE;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        /* XXX hardcoded keymap check.... */
        if(event->type == WHEELDOWNMOUSE && event->alt) {
            mx= but->x1;
            click= 2;
        }
        else if(event->type == WHEELUPMOUSE && event->alt) {
            mx= but->x2;
            click= 2;
        }
        else if(event->val==KM_PRESS) {
            if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->ctrl) {
                button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
                retval= WM_UI_HANDLER_BREAK;
            }
            /* alt-click on sides to get "arrows" like in NUM buttons, and match wheel usage above */
            else if(event->type == LEFTMOUSE && event->alt) {
                int halfpos = (but->x1 + but->x2) / 2;
                click = 2;
                if (mx < halfpos)
                    mx = but->x1;
                else
                    mx = but->x2;
            }
            else if(event->type == LEFTMOUSE) {
                data->dragstartx= mx;
                data->draglastx= mx;
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                retval= WM_UI_HANDLER_BREAK;
            }
            else if(ELEM(event->type, PADENTER, RETKEY) && event->val==KM_PRESS)
                click= 1;
            else if (event->type == MINUSKEY && event->val==KM_PRESS) {
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                data->value = -data->value;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                retval= WM_UI_HANDLER_BREAK;
            }
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == LEFTMOUSE && event->val!=KM_PRESS) {
            if(data->dragchange)
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            else
                click= 1;
        }
        else if(event->type == MOUSEMOVE) {
            if(ui_numedit_but_SLI(but, data, event->shift, event->ctrl, mx))
                ui_numedit_apply(C, block, but, data);
        }
        retval= WM_UI_HANDLER_BREAK;
    }
    else if(data->state == BUTTON_STATE_TEXT_EDITING) {
        ui_do_but_textedit(C, block, but, data, event);
        retval= WM_UI_HANDLER_BREAK;
    }
    else if(data->state == BUTTON_STATE_TEXT_SELECTING) {
        ui_do_but_textedit_select(C, block, but, data, event);
        retval= WM_UI_HANDLER_BREAK;
    }

    if(click) {
        if (click==2) {
            /* nudge slider to the left or right */
            float f, tempf, softmin, softmax, softrange;
            int temp;
            
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
            
            softmin= but->softmin;
            softmax= but->softmax;
            softrange= softmax - softmin;
            
            tempf= data->value;
            temp= (int)data->value;

#if 0
            if(but->type==SLI) {
                f= (float)(mx-but->x1)/(but->x2-but->x1); /* same as below */
            }
            else
#endif
            {
                f= (float)(mx- but->x1)/(but->x2-but->x1);
            }
            
            f= softmin + f*softrange;
            
            if(!ui_is_but_float(but)) {
                if(f<temp) temp--;
                else temp++;
                
                if(temp>=softmin && temp<=softmax)
                    data->value= temp;
                else
                    data->cancel= 1;
            } 
            else {
                if(f<tempf) tempf -= 0.01f;
                else tempf += 0.01f;
                
                if(tempf>=softmin && tempf<=softmax)
                    data->value= tempf;
                else
                    data->cancel= 1;
            }
            
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            retval= WM_UI_HANDLER_BREAK;
        }
        else {
            /* edit the value directly */
            button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
            retval= WM_UI_HANDLER_BREAK;
        }
    }
    
    return retval;
}

static int ui_do_but_SCROLL(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my /*, click= 0 */;
    int retval= WM_UI_HANDLER_CONTINUE;
    int horizontal= (but->x2 - but->x1 > but->y2 - but->y1);
    
    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->val==KM_PRESS) {
            if(event->type == LEFTMOUSE) {
                if(horizontal) {
                    data->dragstartx= mx;
                    data->draglastx= mx;
                }
                else {
                    data->dragstartx= my;
                    data->draglastx= my;
                }
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
                retval= WM_UI_HANDLER_BREAK;
            }
            /* UNUSED - otherwise code is ok, add back if needed */
            /* else if(ELEM(event->type, PADENTER, RETKEY) && event->val==KM_PRESS)
                click= 1;
            */
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == LEFTMOUSE && event->val!=KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == MOUSEMOVE) {
            if(ui_numedit_but_SLI(but, data, 0, 0, (horizontal)? mx: my))
                ui_numedit_apply(C, block, but, data);
        }

        retval= WM_UI_HANDLER_BREAK;
    }
    
    return retval;
}


static int ui_do_but_BLOCK(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        
        /* first handle click on icondrag type button */
        if(event->type==LEFTMOUSE && but->dragpoin && event->val==KM_PRESS) {
            if(ui_but_mouse_inside_icon(but, data->region, event)) {
                button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
                data->dragstartx= event->x;
                data->dragstarty= event->y;
                return WM_UI_HANDLER_BREAK;
            }
        }
        
        /* regular open menu */
        if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val==KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
            return WM_UI_HANDLER_BREAK;
        }
        else if(ELEM3(but->type, MENU, ICONROW, ICONTEXTROW)) {
            
            if(event->type == WHEELDOWNMOUSE && event->alt) {
                data->value= ui_step_name_menu(but, -1);
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                ui_apply_button(C, but->block, but, data, 1);
                return WM_UI_HANDLER_BREAK;
            }
            else if(event->type == WHEELUPMOUSE && event->alt) {
                data->value= ui_step_name_menu(but, 1);
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                ui_apply_button(C, but->block, but, data, 1);
                return WM_UI_HANDLER_BREAK;
            }
        }
        else if(but->type==COL) {
            if( ELEM(event->type, WHEELDOWNMOUSE, WHEELUPMOUSE) && event->alt) {
                float *hsv= ui_block_hsv_get(but->block);
                float col[3];
                
                ui_get_but_vectorf(but, col);
                rgb_to_hsv_compat(col[0], col[1], col[2], hsv, hsv+1, hsv+2);

                if(event->type==WHEELDOWNMOUSE)
                    hsv[2]= CLAMPIS(hsv[2]-0.05f, 0.0f, 1.0f);
                else
                    hsv[2]= CLAMPIS(hsv[2]+0.05f, 0.0f, 1.0f);
                
                hsv_to_rgb(hsv[0], hsv[1], hsv[2], data->vec, data->vec+1, data->vec+2);
                ui_set_but_vectorf(but, data->vec);
                
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                ui_apply_button(C, but->block, but, data, 1);
                return WM_UI_HANDLER_BREAK;
            }
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_DRAG) {
        
        /* this function also ends state */
        if(ui_but_start_drag(C, but, data, event)) {
            return WM_UI_HANDLER_BREAK;
        }
        
        /* outside icon quit, not needed if drag activated */
        if(0==ui_but_mouse_inside_icon(but, data->region, event)) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            data->cancel= 1;
            return WM_UI_HANDLER_BREAK;
        }
        
        if(event->type==LEFTMOUSE && event->val==KM_RELEASE) {
            button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
            return WM_UI_HANDLER_BREAK;
        }

    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_NORMAL(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
    float dx, dy, rad, radsq, mrad, *fp;
    int mdx, mdy, changed= 1;
    
    /* button is presumed square */
    /* if mouse moves outside of sphere, it does negative normal */

    /* note that both data->vec and data->origvec should be normalized
     * else we'll get a hamrless but annoying jump when first clicking */

    fp= data->origvec;
    rad= (but->x2 - but->x1);
    radsq= rad*rad;
    
    if(fp[2]>0.0f) {
        mdx= (rad*fp[0]);
        mdy= (rad*fp[1]);
    }
    else if(fp[2]> -1.0f) {
        mrad= rad/sqrtf(fp[0]*fp[0] + fp[1]*fp[1]);
        
        mdx= 2.0f*mrad*fp[0] - (rad*fp[0]);
        mdy= 2.0f*mrad*fp[1] - (rad*fp[1]);
    }
    else mdx= mdy= 0;
    
    dx= (float)(mx+mdx-data->dragstartx);
    dy= (float)(my+mdy-data->dragstarty);

    fp= data->vec;
    mrad= dx*dx+dy*dy;
    if(mrad < radsq) {  /* inner circle */
        fp[0]= dx;
        fp[1]= dy;
        fp[2]= sqrt( radsq-dx*dx-dy*dy );
    }
    else {  /* outer circle */
        
        mrad= rad/sqrtf(mrad);  // veclen
        
        dx*= (2.0f*mrad - 1.0f);
        dy*= (2.0f*mrad - 1.0f);
        
        mrad= dx*dx+dy*dy;
        if(mrad < radsq) {
            fp[0]= dx;
            fp[1]= dy;
            fp[2]= -sqrt( radsq-dx*dx-dy*dy );
        }
    }
    normalize_v3(fp);

    data->draglastx= mx;
    data->draglasty= my;

    return changed;
}

static int ui_do_but_NORMAL(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

            /* also do drag the first time */
            if(ui_numedit_but_NORMAL(but, data, mx, my))
                ui_numedit_apply(C, block, but, data);
            
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_NORMAL(but, data, mx, my))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS)
            button_activate_state(C, but, BUTTON_STATE_EXIT);

        return WM_UI_HANDLER_BREAK;
    }
    
    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_HSVCUBE(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
    float rgb[3];
    float *hsv= ui_block_hsv_get(but->block);
    float x, y;
    int changed= 1;
    int color_profile = but->block->color_profile;
    
    if (but->rnaprop) {
        if (RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA)
            color_profile = BLI_PR_NONE;
    }

    ui_get_but_vectorf(but, rgb);

    rgb_to_hsv_compat(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);

    /* relative position within box */
    x= ((float)mx-but->x1)/(but->x2-but->x1);
    y= ((float)my-but->y1)/(but->y2-but->y1);
    CLAMP(x, 0.0f, 1.0f);
    CLAMP(y, 0.0f, 1.0f);

    switch((int)but->a1) {
    case UI_GRAD_SV:
        hsv[2]= x;
        hsv[1]= y;
        break;
    case UI_GRAD_HV:
        hsv[0]= x;
        hsv[2]= y;
        break;
    case UI_GRAD_HS:
        hsv[0]= x;
        hsv[1]= y;
        break;
    case UI_GRAD_H:
        hsv[0]= x;
        break;
    case UI_GRAD_S:
        hsv[1]= x;
        break;
    case UI_GRAD_V:
        hsv[2]= x;
        break;
    case UI_GRAD_V_ALT: 
        /* vertical 'value' strip */
    
        /* exception only for value strip - use the range set in but->min/max */
        hsv[2] = y * (but->softmax - but->softmin) + but->softmin;
        
        if (color_profile)
            hsv[2] = srgb_to_linearrgb(hsv[2]);
        
        if (hsv[2] > but->softmax)
            hsv[2] = but->softmax;
        break;
    default:
        assert(!"invalid hsv type");
    }

    hsv_to_rgb(hsv[0], hsv[1], hsv[2], rgb, rgb+1, rgb+2);
    copy_v3_v3(data->vec, rgb);

    data->draglastx= mx;
    data->draglasty= my;

    return changed;
}

static void ui_ndofedit_but_HSVCUBE(uiBut *but, uiHandleButtonData *data, wmNDOFMotionData *ndof, int shift)
{
    float *hsv= ui_block_hsv_get(but->block);
    float rgb[3];
    float sensitivity = (shift ? 0.15f : 0.3f) * ndof->dt;
    
    int color_profile = but->block->color_profile;
    
    if (but->rnaprop) {
        if (RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA)
            color_profile = BLI_PR_NONE;
    }

    ui_get_but_vectorf(but, rgb);
    rgb_to_hsv_compat(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);
    
    switch((int)but->a1) {
        case UI_GRAD_SV:
            hsv[2] += ndof->ry * sensitivity;
            hsv[1] += ndof->rx * sensitivity;
            break;
        case UI_GRAD_HV:
            hsv[0] += ndof->ry * sensitivity;
            hsv[2] += ndof->rx * sensitivity;
            break;
        case UI_GRAD_HS:
            hsv[0] += ndof->ry * sensitivity;
            hsv[1] += ndof->rx * sensitivity;
            break;
        case UI_GRAD_H:
            hsv[0] += ndof->ry * sensitivity;
            break;
        case UI_GRAD_S:
            hsv[1] += ndof->ry * sensitivity;
            break;
        case UI_GRAD_V:
            hsv[2] += ndof->ry * sensitivity;
            break;
        case UI_GRAD_V_ALT: 
            /* vertical 'value' strip */
            
            /* exception only for value strip - use the range set in but->min/max */
            hsv[2] += ndof->rx * sensitivity;
            
            if (color_profile)
                hsv[2] = srgb_to_linearrgb(hsv[2]);
            
            CLAMP(hsv[2], but->softmin, but->softmax);
        default:
            assert(!"invalid hsv type");
    }
    
    hsv_to_rgb(hsv[0], hsv[1], hsv[2], rgb, rgb+1, rgb+2);
    copy_v3_v3(data->vec, rgb);
    ui_set_but_vectorf(but, data->vec);
}

static int ui_do_but_HSVCUBE(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

            /* also do drag the first time */
            if(ui_numedit_but_HSVCUBE(but, data, mx, my))
                ui_numedit_apply(C, block, but, data);
            
            return WM_UI_HANDLER_BREAK;
        }
        else if (event->type == NDOF_MOTION) {
            wmNDOFMotionData *ndof = (wmNDOFMotionData*) event->customdata;
            
            ui_ndofedit_but_HSVCUBE(but, data, ndof, event->shift);
            
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            ui_apply_button(C, but->block, but, data, 1);
            
            return WM_UI_HANDLER_BREAK;
        }
        /* XXX hardcoded keymap check.... */
        else if (event->type == DELKEY && event->val == KM_PRESS) {
            if (but->a1==UI_GRAD_V_ALT){
                int len;
                
                /* reset only value */
                
                len= RNA_property_array_length(&but->rnapoin, but->rnaprop);
                if (len >= 3) {
                    float rgb[3], def_hsv[3];
                    float *def;
                    float *hsv= ui_block_hsv_get(but->block);
                    def= MEM_callocN(sizeof(float)*len, "reset_defaults - float");
                    
                    RNA_property_float_get_default_array(&but->rnapoin, but->rnaprop, def);
                    rgb_to_hsv(def[0], def[1], def[2], def_hsv, def_hsv+1, def_hsv+2);
                    
                    ui_get_but_vectorf(but, rgb);
                    rgb_to_hsv_compat(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);
                    
                    hsv_to_rgb(hsv[0], hsv[1], def_hsv[2], rgb, rgb+1, rgb+2);
                    ui_set_but_vectorf(but, rgb);
                    
                    RNA_property_update(C, &but->rnapoin, but->rnaprop);
                    
                    MEM_freeN(def);
                }
                return WM_UI_HANDLER_BREAK;
            }
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_HSVCUBE(but, data, mx, my))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS)
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        
        return WM_UI_HANDLER_BREAK;
    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_HSVCIRCLE(uiBut *but, uiHandleButtonData *data, int mx, int my, int shift)
{
    rcti rect;
    int changed= 1;
    float rgb[3];
    float hsv[3];
    
    rect.xmin= but->x1; rect.xmax= but->x2;
    rect.ymin= but->y1; rect.ymax= but->y2;
    
    ui_get_but_vectorf(but, rgb);
    copy_v3_v3(hsv, ui_block_hsv_get(but->block));
    rgb_to_hsv_compat(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);
    
    /* exception, when using color wheel in 'locked' value state:
     * allow choosing a hue for black values, by giving a tiny increment */
    if (but->flag & UI_BUT_COLOR_LOCK) { // lock
        if (hsv[2] == 0.f) hsv[2] = 0.0001f;
    }

    if(U.uiflag & USER_CONTINUOUS_MOUSE) {
        float fac= shift ? 0.05f : 1.0f;
        /* slow down the mouse, this is fairly picky */
        mx = (data->dragstartx*(1.0f-fac) + mx*fac);
        my = (data->dragstarty*(1.0f-fac) + my*fac);
    }

    ui_hsvcircle_vals_from_pos(hsv, hsv+1, &rect, (float)mx, (float)my);

    if(but->flag & UI_BUT_COLOR_CUBIC)
        hsv[1]= 1.0f - sqrt3f(1.0f - hsv[1]);

    hsv_to_rgb(hsv[0], hsv[1], hsv[2], rgb, rgb+1, rgb+2);

    if((but->flag & UI_BUT_VEC_SIZE_LOCK) && (rgb[0] || rgb[1] || rgb[2])) {
        normalize_v3(rgb);
        mul_v3_fl(rgb, but->a2);
    }

    ui_set_but_vectorf(but, rgb);
    
    data->draglastx= mx;
    data->draglasty= my;
    
    return changed;
}

static void ui_ndofedit_but_HSVCIRCLE(uiBut *but, uiHandleButtonData *data, wmNDOFMotionData *ndof, int shift)
{
    float *hsv= ui_block_hsv_get(but->block);
    float rgb[3];
    float phi, r /*, sqr */ /* UNUSED */, v[2];
    float sensitivity = (shift ? 0.15f : 0.3f) * ndof->dt;
    
    ui_get_but_vectorf(but, rgb);
    rgb_to_hsv_compat(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);
    
    /* Convert current colour on hue/sat disc to circular coordinates phi, r */
    phi = fmodf(hsv[0] + 0.25f, 1.0f) * -2.0f * (float)M_PI;
    r = hsv[1];
    /* sqr= r>0.f?sqrtf(r):1; */ /* UNUSED */
    
    /* Convert to 2d vectors */
    v[0] = r * cosf(phi);
    v[1] = r * sinf(phi);
    
    /* Use ndof device y and x rotation to move the vector in 2d space */
    v[0] += ndof->ry * sensitivity;
    v[1] += ndof->rx * sensitivity;

    /* convert back to polar coords on circle */
    phi = atan2f(v[0], v[1])/(2.0f*(float)M_PI) + 0.5f;
    
    /* use ndof z rotation to additionally rotate hue */
    phi -= ndof->rz * sensitivity * 0.5f;
    
    r = len_v2(v);
    CLAMP(r, 0.0f, 1.0f);
    
    /* convert back to hsv values, in range [0,1] */
    hsv[0] = fmodf(phi, 1.0f);
    hsv[1] = r;

    /* exception, when using color wheel in 'locked' value state:
     * allow choosing a hue for black values, by giving a tiny increment */
    if (but->flag & UI_BUT_COLOR_LOCK) { // lock
        if (hsv[2] == 0.0f) hsv[2] = 0.0001f;
    }
    
    hsv_to_rgb(hsv[0], hsv[1], hsv[2], data->vec, data->vec+1, data->vec+2);
    
    if((but->flag & UI_BUT_VEC_SIZE_LOCK) && (data->vec[0] || data->vec[1] || data->vec[2])) {
        normalize_v3(data->vec);
        mul_v3_fl(data->vec, but->a2);
    }
    
    ui_set_but_vectorf(but, data->vec);
}


static int ui_do_but_HSVCIRCLE(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;
    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);
    
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
            
            /* also do drag the first time */
            if(ui_numedit_but_HSVCIRCLE(but, data, mx, my, event->shift))
                ui_numedit_apply(C, block, but, data);
            
            return WM_UI_HANDLER_BREAK;
        }
        else if (event->type == NDOF_MOTION) {
            wmNDOFMotionData *ndof = (wmNDOFMotionData*) event->customdata;
            
            ui_ndofedit_but_HSVCIRCLE(but, data, ndof, event->shift);

            button_activate_state(C, but, BUTTON_STATE_EXIT);
            ui_apply_button(C, but->block, but, data, 1);
            
            return WM_UI_HANDLER_BREAK;
        }
        /* XXX hardcoded keymap check.... */
        else if (event->type == DELKEY && event->val == KM_PRESS) {
            int len;
            
            /* reset only saturation */
            
            len= RNA_property_array_length(&but->rnapoin, but->rnaprop);
            if (len >= 3) {
                float rgb[3], def_hsv[3];
                float *def;
                float *hsv= ui_block_hsv_get(but->block);
                def= MEM_callocN(sizeof(float)*len, "reset_defaults - float");
                
                RNA_property_float_get_default_array(&but->rnapoin, but->rnaprop, def);
                rgb_to_hsv(def[0], def[1], def[2], def_hsv, def_hsv+1, def_hsv+2);
                
                ui_get_but_vectorf(but, rgb);
                rgb_to_hsv_compat(rgb[0], rgb[1], rgb[2], hsv, hsv+1, hsv+2);
                
                hsv_to_rgb(hsv[0], def_hsv[1], hsv[2], rgb, rgb+1, rgb+2);
                ui_set_but_vectorf(but, rgb);
                
                RNA_property_update(C, &but->rnapoin, but->rnaprop);
                
                MEM_freeN(def);
            }
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        /* XXX hardcoded keymap check.... */
        else if(event->type == WHEELDOWNMOUSE) {
            float *hsv= ui_block_hsv_get(but->block);
            hsv[2]= CLAMPIS(hsv[2]-0.05f, 0.0f, 1.0f);
            ui_set_but_hsv(but);    // converts to rgb
            ui_numedit_apply(C, block, but, data);
        }
        else if(event->type == WHEELUPMOUSE) {
            float *hsv= ui_block_hsv_get(but->block);
            hsv[2]= CLAMPIS(hsv[2]+0.05f, 0.0f, 1.0f);
            ui_set_but_hsv(but);    // converts to rgb
            ui_numedit_apply(C, block, but, data);
        }
        else if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_HSVCIRCLE(but, data, mx, my, event->shift))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        return WM_UI_HANDLER_BREAK;
    }
    
    return WM_UI_HANDLER_CONTINUE;
}


static int verg_colorband(const void *a1, const void *a2)
{
    const CBData *x1=a1, *x2=a2;
    
    if( x1->pos > x2->pos ) return 1;
    else if( x1->pos < x2->pos) return -1;
    return WM_UI_HANDLER_CONTINUE;
}

static void ui_colorband_update(ColorBand *coba)
{
    int a;
    
    if(coba->tot<2) return;
    
    for(a=0; a<coba->tot; a++) coba->data[a].cur= a;
        qsort(coba->data, coba->tot, sizeof(CBData), verg_colorband);
    for(a=0; a<coba->tot; a++) {
        if(coba->data[a].cur==coba->cur) {
            coba->cur= a;
            break;
        }
    }
}

static int ui_numedit_but_COLORBAND(uiBut *but, uiHandleButtonData *data, int mx)
{
    float dx;
    int changed= 0;

    if(data->draglastx == mx)
        return changed;

    dx= ((float)(mx - data->draglastx))/(but->x2-but->x1);
    data->dragcbd->pos += dx;
    CLAMP(data->dragcbd->pos, 0.0f, 1.0f);
    
    ui_colorband_update(data->coba);
    data->dragcbd= data->coba->data + data->coba->cur;  /* because qsort */
    
    data->draglastx= mx;
    changed= 1;

    return changed;
}

static int ui_do_but_COLORBAND(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    ColorBand *coba;
    CBData *cbd;
    int mx, my, a, xco, mindist= 12;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            coba= (ColorBand*)but->poin;

            if(event->ctrl) {
                /* insert new key on mouse location */
                float pos= ((float)(mx - but->x1))/(but->x2-but->x1);
                colorband_element_add(coba, pos);
                button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
            else {
                data->dragstartx= mx;
                data->dragstarty= my;
                data->draglastx= mx;
                data->draglasty= my;

                /* activate new key when mouse is close */
                for(a=0, cbd= coba->data; a<coba->tot; a++, cbd++) {
                    xco= but->x1 + (cbd->pos*(but->x2-but->x1));
                    xco= ABS(xco-mx);
                    if(a==coba->cur) xco+= 5; // selected one disadvantage
                    if(xco<mindist) {
                        coba->cur= a;
                        mindist= xco;
                    }
                }
        
                data->dragcbd= coba->data + coba->cur;
                button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
            }

            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_COLORBAND(but, data, mx))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS)
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        
        return WM_UI_HANDLER_BREAK;
    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_CURVE(uiBut *but, uiHandleButtonData *data, int snap, int mx, int my)
{
    CurveMapping *cumap= (CurveMapping*)but->poin;
    CurveMap *cuma= cumap->cm+cumap->cur;
    CurveMapPoint *cmp= cuma->curve;
    float fx, fy, zoomx, zoomy /*, offsx, offsy */ /* UNUSED */;
    int a, changed= 0;

    zoomx= (but->x2-but->x1)/(cumap->curr.xmax-cumap->curr.xmin);
    zoomy= (but->y2-but->y1)/(cumap->curr.ymax-cumap->curr.ymin);
    /* offsx= cumap->curr.xmin; */
    /* offsy= cumap->curr.ymin; */

    if(snap) {
        float d[2];

        d[0]= mx - data->dragstartx;
        d[1]= my - data->dragstarty;

        if(len_v2(d) < 3.0f)
            snap= 0;
    }

    if(data->dragsel != -1) {
        int moved_point= 0;     /* for ctrl grid, can't use orig coords because of sorting */
        
        fx= (mx-data->draglastx)/zoomx;
        fy= (my-data->draglasty)/zoomy;
        for(a=0; a<cuma->totpoint; a++) {
            if(cmp[a].flag & SELECT) {
                float origx= cmp[a].x, origy= cmp[a].y;
                cmp[a].x+= fx;
                cmp[a].y+= fy;
                if(snap) {
                    cmp[a].x= 0.125f*floorf(0.5f + 8.0f*cmp[a].x);
                    cmp[a].y= 0.125f*floorf(0.5f + 8.0f*cmp[a].y);
                }
                if(cmp[a].x!=origx || cmp[a].y!=origy)
                    moved_point= 1;
            }
        }

        curvemapping_changed(cumap, 0); /* no remove doubles */
        
        if(moved_point) {
            data->draglastx= mx;
            data->draglasty= my;
            changed= 1;
        }

        data->dragchange= 1; /* mark for selection */
    }
    else {
        fx= (mx-data->draglastx)/zoomx;
        fy= (my-data->draglasty)/zoomy;
        
        /* clamp for clip */
        if(cumap->flag & CUMA_DO_CLIP) {
            if(cumap->curr.xmin-fx < cumap->clipr.xmin)
                fx= cumap->curr.xmin - cumap->clipr.xmin;
            else if(cumap->curr.xmax-fx > cumap->clipr.xmax)
                fx= cumap->curr.xmax - cumap->clipr.xmax;
            if(cumap->curr.ymin-fy < cumap->clipr.ymin)
                fy= cumap->curr.ymin - cumap->clipr.ymin;
            else if(cumap->curr.ymax-fy > cumap->clipr.ymax)
                fy= cumap->curr.ymax - cumap->clipr.ymax;
        }               

        cumap->curr.xmin-=fx;
        cumap->curr.ymin-=fy;
        cumap->curr.xmax-=fx;
        cumap->curr.ymax-=fy;
        
        data->draglastx= mx;
        data->draglasty= my;

        changed= 1;
    }

    return changed;
}

static int ui_do_but_CURVE(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my, a, changed= 0;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            CurveMapping *cumap= (CurveMapping*)but->poin;
            CurveMap *cuma= cumap->cm+cumap->cur;
            CurveMapPoint *cmp;
            float fx, fy, zoomx, zoomy, offsx, offsy;
            float dist, mindist= 200.0f; // 14 pixels radius
            int sel= -1;

            zoomx= (but->x2-but->x1)/(cumap->curr.xmax-cumap->curr.xmin);
            zoomy= (but->y2-but->y1)/(cumap->curr.ymax-cumap->curr.ymin);
            offsx= cumap->curr.xmin;
            offsy= cumap->curr.ymin;

            if(event->ctrl) {
                fx= ((float)my - but->x1)/zoomx + offsx;
                fy= ((float)my - but->y1)/zoomy + offsy;
                
                curvemap_insert(cuma, fx, fy);
                curvemapping_changed(cumap, 0);
                changed= 1;
            }

            /* check for selecting of a point */
            cmp= cuma->curve;   /* ctrl adds point, new malloc */
            for(a=0; a<cuma->totpoint; a++) {
                fx= but->x1 + zoomx*(cmp[a].x-offsx);
                fy= but->y1 + zoomy*(cmp[a].y-offsy);
                dist= (fx-mx)*(fx-mx) + (fy-my)*(fy-my);
                if(dist < mindist) {
                    sel= a;
                    mindist= dist;
                }
            }

            if (sel == -1) {
                int i;

                /* if the click didn't select anything, check if it's clicked on the 
                 * curve itself, and if so, add a point */
                fx= ((float)mx - but->x1)/zoomx + offsx;
                fy= ((float)my - but->y1)/zoomy + offsy;
                
                cmp= cuma->table;

                /* loop through the curve segment table and find what's near the mouse.
                 * 0.05 is kinda arbitrary, but seems to be what works nicely. */
                for(i=0; i<=CM_TABLE; i++) {
                    if ( (fabsf(fx - cmp[i].x) < 0.05f) &&
                         (fabsf(fy - cmp[i].y) < 0.05f))
                    {
                    
                        curvemap_insert(cuma, fx, fy);
                        curvemapping_changed(cumap, 0);

                        changed= 1;
                        
                        /* reset cmp back to the curve points again, rather than drawing segments */        
                        cmp= cuma->curve;
                        
                        /* find newly added point and make it 'sel' */
                        for(a=0; a<cuma->totpoint; a++)
                            if(cmp[a].x == fx)
                                sel = a;
                            
                        break;
                    }
                }
            }

            if(sel!= -1) {
                /* ok, we move a point */
                /* deselect all if this one is deselect. except if we hold shift */
                if(event->shift == FALSE) {
                    for(a=0; a<cuma->totpoint; a++)
                        cmp[a].flag &= ~SELECT;
                    cmp[sel].flag |= SELECT;
                }
                else
                    cmp[sel].flag ^= SELECT;
            }
            else {
                /* move the view */
                data->cancel= 1;
            }

            data->dragsel= sel;

            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;

            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_CURVE(but, data, event->ctrl, mx, my))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS) {
            if(data->dragsel != -1) {
                CurveMapping *cumap= (CurveMapping*)but->poin;
                CurveMap *cuma= cumap->cm+cumap->cur;
                CurveMapPoint *cmp= cuma->curve;

                if(!data->dragchange) {
                    /* deselect all, select one */
                    if(event->shift == FALSE) {
                        for(a=0; a<cuma->totpoint; a++)
                            cmp[a].flag &= ~SELECT;
                        cmp[data->dragsel].flag |= SELECT;
                    }
                }
                else
                    curvemapping_changed(cumap, 1); /* remove doubles */
            }

            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }

        return WM_UI_HANDLER_BREAK;
    }

    /* UNUSED but keep for now */
    (void)changed;

    return WM_UI_HANDLER_CONTINUE;
}

static int in_scope_resize_zone(uiBut *but, int UNUSED(x), int y)
{
    // bottom corner return (x > but->x2 - SCOPE_RESIZE_PAD) && (y < but->y1 + SCOPE_RESIZE_PAD);
    return (y < but->y1 + SCOPE_RESIZE_PAD);
}

static int ui_numedit_but_HISTOGRAM(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
    Histogram *hist = (Histogram *)but->poin;
    /* rcti rect; */
    int changed= 1;
    float /* dx, */ dy, yfac=1.f; /* UNUSED */
    
    /* rect.xmin= but->x1; rect.xmax= but->x2; */
    /* rect.ymin= but->y1; rect.ymax= but->y2; */
    
    /* dx = mx - data->draglastx; */ /* UNUSED */
    dy = my - data->draglasty;
    
    
    if (in_scope_resize_zone(but, data->dragstartx, data->dragstarty)) {
         /* resize histogram widget itself */
        hist->height = (but->y2 - but->y1) + (data->dragstarty - my);
    } else {
        /* scale histogram values */
        yfac = MIN2(powf(hist->ymax, 2.f), 1.f) * 0.5f;
        hist->ymax += dy * yfac;
    
        CLAMP(hist->ymax, 1.f, 100.f);
    }
    
    data->draglastx= mx;
    data->draglasty= my;
    
    return changed;
}

static int ui_do_but_HISTOGRAM(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;
    
    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);
    
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
            
            /* also do drag the first time */
            if(ui_numedit_but_HISTOGRAM(but, data, mx, my))
                ui_numedit_apply(C, block, but, data);
            
            return WM_UI_HANDLER_BREAK;
        }
        /* XXX hardcoded keymap check.... */
        else if (event->type == DELKEY && event->val == KM_PRESS) {
            Histogram *hist = (Histogram *)but->poin;
            hist->ymax = 1.f;
            
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_HISTOGRAM(but, data, mx, my))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        return WM_UI_HANDLER_BREAK;
    }
    
    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_WAVEFORM(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
    Scopes *scopes = (Scopes *)but->poin;
    /* rcti rect; */
    int changed= 1;
    float /* dx, */ dy /* , yfac=1.f */; /* UNUSED */

    /* rect.xmin= but->x1; rect.xmax= but->x2; */
    /* rect.ymin= but->y1; rect.ymax= but->y2; */

    /* dx = mx - data->draglastx; */ /* UNUSED */
    dy = my - data->draglasty;


    if (in_scope_resize_zone(but, data->dragstartx, data->dragstarty)) {
         /* resize waveform widget itself */
        scopes->wavefrm_height = (but->y2 - but->y1) + (data->dragstarty - my);
    } else {
        /* scale waveform values */
        /* yfac = scopes->wavefrm_yfac; */ /* UNUSED */
        scopes->wavefrm_yfac += dy/200.0f;

        CLAMP(scopes->wavefrm_yfac, 0.5f, 2.f);
    }

    data->draglastx= mx;
    data->draglasty= my;

    return changed;
}

static int ui_do_but_WAVEFORM(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

            /* also do drag the first time */
            if(ui_numedit_but_WAVEFORM(but, data, mx, my))
                ui_numedit_apply(C, block, but, data);

            return WM_UI_HANDLER_BREAK;
        }
        /* XXX hardcoded keymap check.... */
        else if (event->type == DELKEY && event->val == KM_PRESS) {
            Scopes *scopes = (Scopes *)but->poin;
            scopes->wavefrm_yfac = 1.f;

            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_WAVEFORM(but, data, mx, my))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        return WM_UI_HANDLER_BREAK;
    }

    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_VECTORSCOPE(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
    Scopes *scopes = (Scopes *)but->poin;
    /* rcti rect; */
    int changed= 1;
    /* float dx, dy; */

    /* rect.xmin= but->x1; rect.xmax= but->x2; */
    /* rect.ymin= but->y1; rect.ymax= but->y2; */

    /* dx = mx - data->draglastx; */
    /* dy = my - data->draglasty; */

    if (in_scope_resize_zone(but, data->dragstartx, data->dragstarty)) {
         /* resize vectorscope widget itself */
        scopes->vecscope_height = (but->y2 - but->y1) + (data->dragstarty - my);
    }

    data->draglastx= mx;
    data->draglasty= my;

    return changed;
}

static int ui_do_but_VECTORSCOPE(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

            /* also do drag the first time */
            if(ui_numedit_but_VECTORSCOPE(but, data, mx, my))
                ui_numedit_apply(C, block, but, data);

            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_VECTORSCOPE(but, data, mx, my))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        return WM_UI_HANDLER_BREAK;
    }

    return WM_UI_HANDLER_CONTINUE;
}

#ifdef WITH_INTERNATIONAL
static int ui_do_but_CHARTAB(bContext *UNUSED(C), uiBlock *UNUSED(block), uiBut *UNUSED(but), uiHandleButtonData *UNUSED(data), wmEvent *UNUSED(event))
{
    /* XXX 2.50 bad global and state access */
#if 0
    float sx, sy, ex, ey;
    float width, height;
    float butw, buth;
    int mx, my, x, y, cs, che;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(ELEM3(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val==KM_PRESS) {
            /* Calculate the size of the button */
            width = abs(but->x2 - but->x1);
            height = abs(but->y2 - but->y1);

            butw = floor(width / 12);
            buth = floor(height / 6);

            /* Initialize variables */
            sx = but->x1;
            ex = but->x1 + butw;
            sy = but->y1 + height - buth;
            ey = but->y1 + height;

            cs = G.charstart;

            /* And the character is */
            x = (int) ((mx / butw) - 0.5);
            y = (int) (6 - ((my / buth) - 0.5));

            che = cs + (y*12) + x;

            if(che > G.charmax)
                che = 0;

            if(G.obedit)
            {
                do_textedit(0,0,che);
            }

            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
        else if(ELEM(event->type, WHEELUPMOUSE, PAGEUPKEY)) {
            for(but= block->buttons.first; but; but= but->next) {
                if(but->type == CHARTAB) {
                    G.charstart = G.charstart - (12*6);
                    if(G.charstart < 0)
                        G.charstart = 0;
                    if(G.charstart < G.charmin)
                        G.charstart = G.charmin;
                    ui_draw_but(but);

                    //Really nasty... to update the num button from the same butblock
                    for(bt= block->buttons.first; bt; bt= bt->next)
                    {
                        if(ELEM(bt->type, NUM, NUMABS)) {
                            ui_check_but(bt);
                            ui_draw_but(bt);
                        }
                    }
                    retval=UI_CONT;
                    break;
                }
            }

            return WM_UI_HANDLER_BREAK;
        }
        else if(ELEM(event->type, WHEELDOWNMOUSE, PAGEDOWNKEY)) {
            for(but= block->buttons.first; but; but= but->next)
            {
                if(but->type == CHARTAB)
                {
                    G.charstart = G.charstart + (12*6);
                    if(G.charstart > (0xffff - 12*6))
                        G.charstart = 0xffff - (12*6);
                    if(G.charstart > G.charmax - 12*6)
                        G.charstart = G.charmax - 12*6;
                    ui_draw_but(but);

                    for(bt= block->buttons.first; bt; bt= bt->next)
                    {
                        if(ELEM(bt->type, NUM, NUMABS)) {
                            ui_check_but(bt);
                            ui_draw_but(bt);
                        }
                    }
                    
                    but->flag |= UI_ACTIVE;
                    retval=UI_RETURN_OK;
                    break;
                }
            }

            return WM_UI_HANDLER_BREAK;
        }
    }
#endif

    return WM_UI_HANDLER_CONTINUE;
}
#endif


static int ui_do_but_LINK(bContext *C, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{   
    VECCOPY2D(but->linkto, event->mval);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type == LEFTMOUSE && event->val==KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_WAIT_RELEASE);
            return WM_UI_HANDLER_BREAK;
        }
        else if(event->type == LEFTMOUSE && but->block->handle) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_RELEASE) {
        
        if(event->type == LEFTMOUSE && event->val!=KM_PRESS) {
            if(!(but->flag & UI_SELECT))
                data->cancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }
    
    return WM_UI_HANDLER_CONTINUE;
}

static int ui_numedit_but_TRACKPREVIEW(bContext *C, uiBut *but, uiHandleButtonData *data, int mx, int my, int shift)
{
    MovieClipScopes *scopes = (MovieClipScopes *)but->poin;
    int changed= 1;
    float dx, dy;

    dx = mx - data->draglastx;
    dy = my - data->draglasty;

    if(shift) {
        dx /= 5.0f;
        dy /= 5.0f;
    }

    if (in_scope_resize_zone(but, data->dragstartx, data->dragstarty)) {
         /* resize preview widget itself */
        scopes->track_preview_height = (but->y2 - but->y1) + (data->dragstarty - my);
    } else {
        if(scopes->marker) {
            if(scopes->marker->framenr!=scopes->framenr)
                scopes->marker= BKE_tracking_ensure_marker(scopes->track, scopes->framenr);

            scopes->marker->flag&= ~(MARKER_DISABLED|MARKER_TRACKED);
            scopes->marker->pos[0]+= -dx*scopes->slide_scale[0] / (but->block->maxx-but->block->minx);
            scopes->marker->pos[1]+= -dy*scopes->slide_scale[1] / (but->block->maxy-but->block->miny);

            WM_event_add_notifier(C, NC_MOVIECLIP|NA_EDITED, NULL);
        }

        scopes->ok= 0;
    }

    data->draglastx= mx;
    data->draglasty= my;

    return changed;
}

static int ui_do_but_TRACKPREVIEW(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, wmEvent *event)
{
    int mx, my;

    mx= event->x;
    my= event->y;
    ui_window_to_block(data->region, block, &mx, &my);

    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        if(event->type==LEFTMOUSE && event->val==KM_PRESS) {
            data->dragstartx= mx;
            data->dragstarty= my;
            data->draglastx= mx;
            data->draglasty= my;
            button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

            /* also do drag the first time */
            if(ui_numedit_but_TRACKPREVIEW(C, but, data, mx, my, event->shift))
                ui_numedit_apply(C, block, but, data);

            return WM_UI_HANDLER_BREAK;
        }
    }
    else if(data->state == BUTTON_STATE_NUM_EDITING) {
        if(event->type == ESCKEY) {
            data->cancel= 1;
            data->escapecancel= 1;
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        else if(event->type == MOUSEMOVE) {
            if(mx!=data->draglastx || my!=data->draglasty) {
                if(ui_numedit_but_TRACKPREVIEW(C, but, data, mx, my, event->shift))
                    ui_numedit_apply(C, block, but, data);
            }
        }
        else if(event->type==LEFTMOUSE && event->val!=KM_PRESS) {
            button_activate_state(C, but, BUTTON_STATE_EXIT);
        }
        return WM_UI_HANDLER_BREAK;
    }

    return WM_UI_HANDLER_CONTINUE;
}

static void but_shortcut_name_func(bContext *C, void *arg1, int UNUSED(event))
{
    uiBut *but = (uiBut *)arg1;

    if (but->optype) {
        char buf[512], *cpoin;

        IDProperty *prop= (but->opptr)? but->opptr->data: NULL;
        
        /* complex code to change name of button */
        if(WM_key_event_operator_string(C, but->optype->idname, but->opcontext, prop, TRUE,
                                        buf, sizeof(buf)))
        {
            char *butstr_orig;

            // XXX but->str changed... should not, remove the hotkey from it
            cpoin= strchr(but->str, '|');
            if(cpoin) *cpoin= 0;        

            butstr_orig= BLI_strdup(but->str);
            BLI_snprintf(but->strdata, sizeof(but->strdata), "%s|%s", butstr_orig, buf);
            MEM_freeN(butstr_orig);
            but->str= but->strdata;

            ui_check_but(but);
        }
        else {
            /* shortcut was removed */
            cpoin= strchr(but->str, '|');
            if(cpoin) *cpoin= 0;
        }
    }
}

static uiBlock *menu_change_shortcut(bContext *C, ARegion *ar, void *arg)
{
    wmWindowManager *wm= CTX_wm_manager(C);
    uiBlock *block;
    uiBut *but = (uiBut *)arg;
    wmKeyMap *km;
    wmKeyMapItem *kmi;
    PointerRNA ptr;
    uiLayout *layout;
    uiStyle *style= UI_GetStyle();
    IDProperty *prop= (but->opptr)? but->opptr->data: NULL;
    int kmi_id = WM_key_event_operator_id(C, but->optype->idname, but->opcontext, prop, 1, &km);

    kmi = WM_keymap_item_find_id(km, kmi_id);
    
    RNA_pointer_create(&wm->id, &RNA_KeyMapItem, kmi, &ptr);
    
    block= uiBeginBlock(C, ar, "_popup", UI_EMBOSS);
    uiBlockSetHandleFunc(block, but_shortcut_name_func, but);
    uiBlockSetFlag(block, UI_BLOCK_MOVEMOUSE_QUIT);
    uiBlockSetDirection(block, UI_CENTER);
    
    layout= uiBlockLayout(block, UI_LAYOUT_VERTICAL, UI_LAYOUT_PANEL, 0, 0, 200, 20, style);
    
    uiItemR(layout, &ptr, "type", UI_ITEM_R_FULL_EVENT|UI_ITEM_R_IMMEDIATE, "", ICON_NONE);
    
    uiPopupBoundsBlock(block, 6, -50, 26);
    uiEndBlock(C, block);
    
    return block;
}

static uiBlock *menu_add_shortcut(bContext *C, ARegion *ar, void *arg)
{
    wmWindowManager *wm= CTX_wm_manager(C);
    uiBlock *block;
    uiBut *but = (uiBut *)arg;
    wmKeyMap *km;
    wmKeyMapItem *kmi;
    PointerRNA ptr;
    uiLayout *layout;
    uiStyle *style= UI_GetStyle();
    IDProperty *prop= (but->opptr)? but->opptr->data: NULL;
    int kmi_id;
    
    /* XXX this guess_opname can potentially return a different keymap than being found on adding later... */
    km = WM_keymap_guess_opname(C, but->optype->idname);        
    kmi = WM_keymap_add_item(km, but->optype->idname, AKEY, KM_PRESS, 0, 0);
    kmi_id = kmi->id;

    /* copy properties, prop can be NULL for reset */   
    if(prop)
        prop= IDP_CopyProperty(prop);
    WM_keymap_properties_reset(kmi, prop);

    /* update and get pointers again */
    WM_keyconfig_update(wm);

    km = WM_keymap_guess_opname(C, but->optype->idname);        
    kmi = WM_keymap_item_find_id(km, kmi_id);

    RNA_pointer_create(&wm->id, &RNA_KeyMapItem, kmi, &ptr);

    block= uiBeginBlock(C, ar, "_popup", UI_EMBOSS);
    uiBlockSetHandleFunc(block, but_shortcut_name_func, but);
    uiBlockSetFlag(block, UI_BLOCK_RET_1);
    uiBlockSetDirection(block, UI_CENTER);

    layout= uiBlockLayout(block, UI_LAYOUT_VERTICAL, UI_LAYOUT_PANEL, 0, 0, 200, 20, style);

    uiItemR(layout, &ptr, "type", UI_ITEM_R_FULL_EVENT|UI_ITEM_R_IMMEDIATE, "", ICON_NONE);
    
    uiPopupBoundsBlock(block, 6, -50, 26);
    uiEndBlock(C, block);
    
    return block;
}

static void popup_change_shortcut_func(bContext *C, void *arg1, void *UNUSED(arg2))
{
    uiBut *but = (uiBut *)arg1;
    button_timers_tooltip_remove(C, but);
    uiPupBlock(C, menu_change_shortcut, but);
}

static void remove_shortcut_func(bContext *C, void *arg1, void *UNUSED(arg2))
{
    uiBut *but = (uiBut *)arg1;
    wmKeyMap *km;
    wmKeyMapItem *kmi;
    IDProperty *prop= (but->opptr)? but->opptr->data: NULL;
    int kmi_id = WM_key_event_operator_id(C, but->optype->idname, but->opcontext, prop, 1, &km);
    
    kmi = WM_keymap_item_find_id(km, kmi_id);
    WM_keymap_remove_item(km, kmi);
    
    but_shortcut_name_func(C, but, 0);
}

static void popup_add_shortcut_func(bContext *C, void *arg1, void *UNUSED(arg2))
{
    uiBut *but = (uiBut *)arg1;
    button_timers_tooltip_remove(C, but);
    uiPupBlock(C, menu_add_shortcut, but);
}


static int ui_but_menu(bContext *C, uiBut *but)
{
    uiPopupMenu *pup;
    uiLayout *layout;
    int length;
    const char *name;

    if((but->rnapoin.data && but->rnaprop)==0 && but->optype==NULL)
        return 0;
    
    button_timers_tooltip_remove(C, but);

    if(but->rnaprop)
        name= RNA_property_ui_name(but->rnaprop);
    else if (but->optype)
        name= but->optype->name;
    else
        name= "<needs_name>"; // XXX - should never happen.

    pup= uiPupMenuBegin(C, name, ICON_NONE);
    layout= uiPupMenuLayout(pup);
    
    uiLayoutSetOperatorContext(layout, WM_OP_INVOKE_DEFAULT);

    if(but->rnapoin.data && but->rnaprop) {
        short is_anim= RNA_property_animateable(&but->rnapoin, but->rnaprop);

        /* second slower test, saved people finding keyframe items in menus when its not possible */
        if(is_anim)
            is_anim= RNA_property_path_from_ID_check(&but->rnapoin, but->rnaprop);

        length= RNA_property_array_length(&but->rnapoin, but->rnaprop);
        
        /* Keyframes */
        if(but->flag & UI_BUT_ANIMATED_KEY) {
            /* replace/delete keyfraemes */
            if(length) {
                uiItemBooleanO(layout, "Replace Keyframes", ICON_NONE, "ANIM_OT_keyframe_insert_button", "all", 1);
                uiItemBooleanO(layout, "Replace Single Keyframe", ICON_NONE, "ANIM_OT_keyframe_insert_button", "all", 0);
                uiItemBooleanO(layout, "Delete Keyframes", ICON_NONE, "ANIM_OT_keyframe_delete_button", "all", 1);
                uiItemBooleanO(layout, "Delete Single Keyframe", ICON_NONE, "ANIM_OT_keyframe_delete_button", "all", 0);
            }
            else {
                uiItemBooleanO(layout, "Replace Keyframe", ICON_NONE, "ANIM_OT_keyframe_insert_button", "all", 0);
                uiItemBooleanO(layout, "Delete Keyframe", ICON_NONE, "ANIM_OT_keyframe_delete_button", "all", 0);
            }
            
            /* keyframe settings */
            uiItemS(layout);
            
            
        }
        else if(but->flag & UI_BUT_DRIVEN);
        else if(is_anim) {
            if(length) {
                uiItemBooleanO(layout, "Insert Keyframes", ICON_NONE, "ANIM_OT_keyframe_insert_button", "all", 1);
                uiItemBooleanO(layout, "Insert Single Keyframe", ICON_NONE, "ANIM_OT_keyframe_insert_button", "all", 0);
            }
            else
                uiItemBooleanO(layout, "Insert Keyframe", ICON_NONE, "ANIM_OT_keyframe_insert_button", "all", 0);
        }
        
        /* Drivers */
        if(but->flag & UI_BUT_DRIVEN) {
            uiItemS(layout);

            if(length) {
                uiItemBooleanO(layout, "Delete Drivers", ICON_NONE, "ANIM_OT_driver_button_remove", "all", 1);
                uiItemBooleanO(layout, "Delete Single Driver", ICON_NONE, "ANIM_OT_driver_button_remove", "all", 0);
            }
            else
                uiItemBooleanO(layout, "Delete Driver", ICON_NONE, "ANIM_OT_driver_button_remove", "all", 0);

            uiItemO(layout, "Copy Driver", ICON_NONE, "ANIM_OT_copy_driver_button");
            if (ANIM_driver_can_paste())
                uiItemO(layout, "Paste Driver", ICON_NONE, "ANIM_OT_paste_driver_button");
        }
        else if(but->flag & (UI_BUT_ANIMATED_KEY|UI_BUT_ANIMATED));
        else if(is_anim) {
            uiItemS(layout);

            if(length) {
                uiItemBooleanO(layout, "Add Drivers", ICON_NONE, "ANIM_OT_driver_button_add", "all", 1);
                uiItemBooleanO(layout, "Add Single Driver", ICON_NONE, "ANIM_OT_driver_button_add", "all", 0);
            }
            else
                uiItemBooleanO(layout, "Add Driver", ICON_NONE, "ANIM_OT_driver_button_add", "all", 0);

            if (ANIM_driver_can_paste())
                uiItemO(layout, "Paste Driver", ICON_NONE, "ANIM_OT_paste_driver_button");
        }
        
        /* Keying Sets */
        // TODO: check on modifyability of Keying Set when doing this
        if(is_anim) {
            uiItemS(layout);

            if(length) {
                uiItemBooleanO(layout, "Add All to Keying Set", ICON_NONE, "ANIM_OT_keyingset_button_add", "all", 1);
                uiItemBooleanO(layout, "Add Single to Keying Set", ICON_NONE, "ANIM_OT_keyingset_button_add", "all", 0);
                uiItemO(layout, "Remove from Keying Set", ICON_NONE, "ANIM_OT_keyingset_button_remove");
            }
            else {
                uiItemBooleanO(layout, "Add to Keying Set", ICON_NONE, "ANIM_OT_keyingset_button_add", "all", 0);
                uiItemO(layout, "Remove from Keying Set", ICON_NONE, "ANIM_OT_keyingset_button_remove");
            }
        }
        
        uiItemS(layout);
        
        /* Property Operators */
        
        //Copy Property Value
        //Paste Property Value
        
        if(length) {
            uiItemBooleanO(layout, "Reset All to Default Values", ICON_NONE, "UI_OT_reset_default_button", "all", 1);
            uiItemBooleanO(layout, "Reset Single to Default Value", ICON_NONE, "UI_OT_reset_default_button", "all", 0);
        }
        else
            uiItemO(layout, "Reset to Default Value", ICON_NONE, "UI_OT_reset_default_button");
        
        uiItemO(layout, "Copy Data Path", ICON_NONE, "UI_OT_copy_data_path_button");
        uiItemO(layout, "Copy To Selected", ICON_NONE, "UI_OT_copy_to_selected_button");

        uiItemS(layout);
    }

    /* Operator buttons */
    if(but->optype) {
        uiBlock *block = uiLayoutGetBlock(layout);
        uiBut *but2;
        IDProperty *prop= (but->opptr)? but->opptr->data: NULL;
        int w = uiLayoutGetWidth(layout);
        wmKeyMap *km;
        wmKeyMapItem *kmi= NULL;
        int kmi_id= WM_key_event_operator_id(C, but->optype->idname, but->opcontext, prop, 1, &km);

        if (kmi_id)
            kmi= WM_keymap_item_find_id(km, kmi_id);

        /* keyboard shortcuts */
        if ((kmi) && ISKEYBOARD(kmi->type)) {

            // would rather use a block but, but gets weirdly positioned...
            //uiDefBlockBut(block, menu_change_shortcut, but, "Change Shortcut", 0, 0, uiLayoutGetWidth(layout), UI_UNIT_Y, "");
            
            but2 = uiDefIconTextBut(block, BUT, 0, 0, "Change Shortcut", 0, 0, w, UI_UNIT_Y, NULL, 0, 0, 0, 0, "");
            uiButSetFunc(but2, popup_change_shortcut_func, but, NULL);

            but2 = uiDefIconTextBut(block, BUT, 0, 0, "Remove Shortcut", 0, 0, w, UI_UNIT_Y, NULL, 0, 0, 0, 0, "");
            uiButSetFunc(but2, remove_shortcut_func, but, NULL);
        }
        /* only show 'add' if there's a suitable key map for it to go in */
        else if (WM_keymap_guess_opname(C, but->optype->idname)) {
            but2 = uiDefIconTextBut(block, BUT, 0, 0, "Add Shortcut", 0, 0, w, UI_UNIT_Y, NULL, 0, 0, 0, 0, "");
            uiButSetFunc(but2, popup_add_shortcut_func, but, NULL);
        }
        
        uiItemS(layout);
    }

    
    {   /* Docs */
        char buf[512];
        PointerRNA ptr_props;

        if(but->rnapoin.data && but->rnaprop) {
            BLI_snprintf(buf, sizeof(buf), "%s.%s", RNA_struct_identifier(but->rnapoin.type), RNA_property_identifier(but->rnaprop));

            WM_operator_properties_create(&ptr_props, "WM_OT_doc_view");
            RNA_string_set(&ptr_props, "doc_id", buf);
            uiItemFullO(layout, "WM_OT_doc_view", "View Docs", ICON_NONE, ptr_props.data, WM_OP_EXEC_DEFAULT, 0);

            /* XXX inactive option, not for public! */
/*          WM_operator_properties_create(&ptr_props, "WM_OT_doc_edit");
            RNA_string_set(&ptr_props, "doc_id", buf);
            RNA_string_set(&ptr_props, "doc_new", RNA_property_description(but->rnaprop));

            uiItemFullO(layout, "WM_OT_doc_edit", "Submit Description", ICON_NONE, ptr_props.data, WM_OP_INVOKE_DEFAULT, 0);
 */
        }
        else if (but->optype) {
            WM_operator_py_idname(buf, but->optype->idname);

            WM_operator_properties_create(&ptr_props, "WM_OT_doc_view");
            RNA_string_set(&ptr_props, "doc_id", buf);
            uiItemFullO(layout, "WM_OT_doc_view", "View Docs", ICON_NONE, ptr_props.data, WM_OP_EXEC_DEFAULT, 0);


            WM_operator_properties_create(&ptr_props, "WM_OT_doc_edit");
            RNA_string_set(&ptr_props, "doc_id", buf);
            RNA_string_set(&ptr_props, "doc_new", but->optype->description);

            uiItemFullO(layout, "WM_OT_doc_edit", "Submit Description", ICON_NONE, ptr_props.data, WM_OP_INVOKE_DEFAULT, 0);
        }
    }

    /* perhaps we should move this into (G.f & G_DEBUG) - campbell */
    uiItemFullO(layout, "UI_OT_editsource", "Edit Source", ICON_NONE, NULL, WM_OP_INVOKE_DEFAULT, 0);

    uiPupMenuEnd(C, pup);

    return 1;
}

static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, wmEvent *event)
{
//  Scene *scene= CTX_data_scene(C);
    uiHandleButtonData *data;
    int retval;

    data= but->active;
    retval= WM_UI_HANDLER_CONTINUE;

    if(but->flag & UI_BUT_DISABLED)
        return WM_UI_HANDLER_CONTINUE;

    if( (data->state == BUTTON_STATE_HIGHLIGHT) &&
        /* check prevval because of modal operators [#24016],
         * modifier check is to allow Ctrl+C for copy.
         * if this causes other problems, remove this check and suffer the bug :) - campbell */
        ((event->prevval != KM_PRESS) || (ISKEYMODIFIER(event->prevtype)) || (event->type == EVT_DROP))
    ) {
        /* handle copy-paste */
        if(ELEM(event->type, CKEY, VKEY) && event->val==KM_PRESS && (event->ctrl || event->oskey)) {
            ui_but_copy_paste(C, but, data, (event->type == CKEY)? 'c': 'v');
            return WM_UI_HANDLER_BREAK;
        }
        /* handle drop */
        else if(event->type == EVT_DROP) {
            ui_but_drop (C, event, but, data);
        }
        /* handle keyframing */
        else if(event->type == IKEY && !ELEM3(KM_MOD_FIRST, event->ctrl, event->oskey, event->shift) && event->val == KM_PRESS) {
            if(event->alt)
                ui_but_anim_delete_keyframe(C);
            else
                ui_but_anim_insert_keyframe(C);
            
            ED_region_tag_redraw(CTX_wm_region(C));
            
            return WM_UI_HANDLER_BREAK;
        }
        /* handle drivers */
        else if(event->type == DKEY && !ELEM3(KM_MOD_FIRST, event->ctrl, event->oskey, event->shift) && event->val == KM_PRESS) {
            if(event->alt)
                ui_but_anim_remove_driver(C);
            else
                ui_but_anim_add_driver(C);
                
            ED_region_tag_redraw(CTX_wm_region(C));
            
            return WM_UI_HANDLER_BREAK;
        }
        /* handle keyingsets */
        else if(event->type == KKEY && !ELEM3(KM_MOD_FIRST, event->ctrl, event->oskey, event->shift) && event->val == KM_PRESS) {
            if(event->alt)
                ui_but_anim_remove_keyingset(C);
            else
                ui_but_anim_add_keyingset(C);
                
            ED_region_tag_redraw(CTX_wm_region(C));
            
            return WM_UI_HANDLER_BREAK;
        }
        /* reset to default */
        /* XXX hardcoded keymap check.... */
        else if(ELEM(event->type, DELKEY, PADPERIOD) && event->val == KM_PRESS) {
            /* ctrl+del - reset active button; del - reset a whole array*/
            if (!(ELEM3(but->type, HSVCIRCLE, HSVCUBE, HISTOGRAM)))
                ui_set_but_default(C, !event->ctrl);
        }
        /* handle menu */
        else if(event->type == RIGHTMOUSE && event->val == KM_PRESS) {
            /* RMB has two options now */
            if (ui_but_menu(C, but)) {
                return WM_UI_HANDLER_BREAK;
            }
        }
    }

    /* verify if we can edit this button */
    if(ELEM(event->type, LEFTMOUSE, RETKEY)) {
        /* this should become disabled button .. */
        if(but->lock) {
            if(but->lockstr) {
                BKE_report(NULL, RPT_WARNING, but->lockstr);
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                return WM_UI_HANDLER_BREAK;
            }
        } 
        else if(but->pointype && but->poin==NULL) {
            /* there's a pointer needed */
            BKE_reportf(NULL, RPT_WARNING, "DoButton pointer error: %s", but->str);
            button_activate_state(C, but, BUTTON_STATE_EXIT);
            return WM_UI_HANDLER_BREAK;
        }
    }

    switch(but->type) {
    case BUT:
        retval= ui_do_but_BUT(C, but, data, event);
        break;
    case KEYEVT:
        retval= ui_do_but_KEYEVT(C, but, data, event);
        break;
    case HOTKEYEVT:
        retval= ui_do_but_HOTKEYEVT(C, but, data, event);
        break;
    case TOGBUT: 
    case TOG: 
    case TOGR: 
    case ICONTOG:
    case ICONTOGN:
    case TOGN:
    case BUT_TOGDUAL:
    case OPTION:
    case OPTIONN:
        retval= ui_do_but_TOG(C, but, data, event);
        break;
    case SCROLL:
        retval= ui_do_but_SCROLL(C, block, but, data, event);
        break;
    case NUM:
    case NUMABS:
        retval= ui_do_but_NUM(C, block, but, data, event);
        break;
    case SLI:
    case NUMSLI:
    case HSVSLI:
        retval= ui_do_but_SLI(C, block, but, data, event);
        break;
    case ROUNDBOX:  
    case LISTBOX:
    case LABEL: 
    case TOG3:  
    case ROW:
    case LISTROW:
    case BUT_IMAGE:
    case PROGRESSBAR:
        retval= ui_do_but_EXIT(C, but, data, event);
        break;
    case HISTOGRAM:
        retval= ui_do_but_HISTOGRAM(C, block, but, data, event);
        break;
    case WAVEFORM:
        retval= ui_do_but_WAVEFORM(C, block, but, data, event);
        break;
    case VECTORSCOPE:
        retval= ui_do_but_VECTORSCOPE(C, block, but, data, event);
        break;
    case TEX:
    case IDPOIN:
    case SEARCH_MENU:
        retval= ui_do_but_TEX(C, block, but, data, event);
        break;
    case MENU:
    case ICONROW:
    case ICONTEXTROW:
    case BLOCK:
    case PULLDOWN:
        retval= ui_do_but_BLOCK(C, but, data, event);
        break;
    case BUTM:
        retval= ui_do_but_BUT(C, but, data, event);
        break;
    case COL:
        if(but->a1 == UI_GRAD_V_ALT)  // signal to prevent calling up color picker
            retval= ui_do_but_EXIT(C, but, data, event);
        else
            retval= ui_do_but_BLOCK(C, but, data, event);
        break;
    case BUT_NORMAL:
        retval= ui_do_but_NORMAL(C, block, but, data, event);
        break;
    case BUT_COLORBAND:
        retval= ui_do_but_COLORBAND(C, block, but, data, event);
        break;
    case BUT_CURVE:
        retval= ui_do_but_CURVE(C, block, but, data, event);
        break;
    case HSVCUBE:
        retval= ui_do_but_HSVCUBE(C, block, but, data, event);
        break;
    case HSVCIRCLE:
        retval= ui_do_but_HSVCIRCLE(C, block, but, data, event);
        break;
#ifdef WITH_INTERNATIONAL
    case CHARTAB:
        retval= ui_do_but_CHARTAB(C, block, but, data, event);
        break;
#endif

    case LINK:
    case INLINK:
        retval= ui_do_but_LINK(C, but, data, event);
        break;
    case TRACKPREVIEW:
        retval= ui_do_but_TRACKPREVIEW(C, block, but, data, event);
        break;
    }
    
    return retval;
}

/* ************************ button utilities *********************** */

static int ui_but_contains_pt(uiBut *but, int mx, int my)
{
    return ((but->x1<mx && but->x2>=mx) && (but->y1<my && but->y2>=my));
}

static uiBut *ui_but_find_activated(ARegion *ar)
{
    uiBlock *block;
    uiBut *but;

    for(block=ar->uiblocks.first; block; block=block->next)
        for(but=block->buttons.first; but; but= but->next)
            if(but->active)
                return but;

    return NULL;
}

int ui_button_is_active(ARegion *ar)
{
    return (ui_but_find_activated(ar) != NULL);
}

/* is called by notifier */
void uiFreeActiveButtons(const bContext *C, bScreen *screen)
{
    ScrArea *sa= screen->areabase.first;
    
    for(;sa; sa= sa->next) {
        ARegion *ar= sa->regionbase.first;
        for(;ar; ar= ar->next) {
            uiBut *but= ui_but_find_activated(ar);
            if(but) {
                uiHandleButtonData *data= but->active;
                
                if(data->menu==NULL && data->searchbox==NULL)
                    if(data->state == BUTTON_STATE_HIGHLIGHT)
                        ui_button_active_free(C, but);
            }
        }
    }
}



/* returns TRUE if highlighted button allows drop of names */
/* called in region context */
int UI_but_active_drop_name(bContext *C)
{
    ARegion *ar= CTX_wm_region(C);
    uiBut *but= ui_but_find_activated(ar);

    if(but) {
        if(ELEM3(but->type, TEX, IDPOIN, SEARCH_MENU))
            return 1;
    }
    
    return 0;
}

static void ui_blocks_set_tooltips(ARegion *ar, int enable)
{
    uiBlock *block;

    if(!ar)
        return;

    /* we disabled buttons when when they were already shown, and
     * re-enable them on mouse move */
    for(block=ar->uiblocks.first; block; block=block->next)
        block->tooltipdisabled= !enable;
}

static int ui_mouse_inside_region(ARegion *ar, int x, int y)
{
    uiBlock *block;
    
    /* check if the mouse is in the region */
    if(!BLI_in_rcti(&ar->winrct, x, y)) {
        for(block=ar->uiblocks.first; block; block=block->next)
            block->auto_open= FALSE;
        
        return 0;
    }

    /* also, check that with view2d, that the mouse is not over the scrollbars 
     * NOTE: care is needed here, since the mask rect may include the scrollbars
     * even when they are not visible, so we need to make a copy of the mask to
     * use to check
     */
    if(ar->v2d.mask.xmin!=ar->v2d.mask.xmax) {
        View2D *v2d= &ar->v2d;
        rcti mask_rct;
        int mx, my;
        
        /* convert window coordinates to region coordinates */
        mx= x;
        my= y;
        ui_window_to_region(ar, &mx, &my);
        
        /* make a copy of the mask rect, and tweak accordingly for hidden scrollbars */
        mask_rct.xmin= v2d->mask.xmin;
        mask_rct.xmax= v2d->mask.xmax;
        mask_rct.ymin= v2d->mask.ymin;
        mask_rct.ymax= v2d->mask.ymax;
        
        if (v2d->scroll & (V2D_SCROLL_VERTICAL_HIDE|V2D_SCROLL_VERTICAL_FULLR)) {
            if (v2d->scroll & V2D_SCROLL_LEFT)
                mask_rct.xmin= v2d->vert.xmin;
            else if (v2d->scroll & V2D_SCROLL_RIGHT)
                mask_rct.xmax= v2d->vert.xmax;
        }
        if (v2d->scroll & (V2D_SCROLL_HORIZONTAL_HIDE|V2D_SCROLL_HORIZONTAL_FULLR)) {
            if (v2d->scroll & (V2D_SCROLL_BOTTOM|V2D_SCROLL_BOTTOM_O))
                mask_rct.ymin= v2d->hor.ymin;
            else if (v2d->scroll & V2D_SCROLL_TOP)
                mask_rct.ymax= v2d->hor.ymax;
        }
        
        /* check if in the rect */
        if(!BLI_in_rcti(&mask_rct, mx, my)) 
            return 0;
    }
    
    return 1;
}

static int ui_mouse_inside_button(ARegion *ar, uiBut *but, int x, int y)
{
    if(!ui_mouse_inside_region(ar, x, y))
        return 0;

    ui_window_to_block(ar, but->block, &x, &y);

    if(!ui_but_contains_pt(but, x, y))
        return 0;
    
    return 1;
}

static uiBut *ui_but_find_mouse_over(ARegion *ar, int x, int y)
{
    uiBlock *block;
    uiBut *but, *butover= NULL;
    int mx, my;

//  if(!win->active)
//      return NULL;
    if(!ui_mouse_inside_region(ar, x, y))
        return NULL;

    for(block=ar->uiblocks.first; block; block=block->next) {
        mx= x;
        my= y;
        ui_window_to_block(ar, block, &mx, &my);

        for(but=block->buttons.first; but; but= but->next) {
            /* note, LABEL is included for hilights, this allows drags */
            if(but->type==LABEL && but->dragpoin==NULL)
                continue;
            if(ELEM3(but->type, ROUNDBOX, SEPR, LISTBOX))
                continue;
            if(but->flag & UI_HIDDEN)
                continue;
            if(but->flag & UI_SCROLLED)
                continue;
            if(ui_but_contains_pt(but, mx, my))
                butover= but;
        }

        /* CLIP_EVENTS prevents the event from reaching other blocks */
        if (block->flag & UI_BLOCK_CLIP_EVENTS) {
            /* check if mouse is inside block */
            if(block->minx <= mx && block->maxx >= mx &&
               block->miny <= my && block->maxy >= my)
                break;
        }
    }

    return butover;
}

static uiBut *ui_list_find_mouse_over(ARegion *ar, int x, int y)
{
    uiBlock *block;
    uiBut *but;
    int mx, my;

//  if(!win->active)
//      return NULL;
    if(!ui_mouse_inside_region(ar, x, y))
        return NULL;

    for(block=ar->uiblocks.first; block; block=block->next) {
        mx= x;
        my= y;
        ui_window_to_block(ar, block, &mx, &my);

        for(but=block->buttons.last; but; but= but->prev)
            if(but->type == LISTBOX && ui_but_contains_pt(but, mx, my))
                return but;
    }

    return NULL;
}

/* ****************** button state handling **************************/

static int button_modal_state(uiHandleButtonState state)
{
    return ELEM6(state, BUTTON_STATE_WAIT_RELEASE, BUTTON_STATE_WAIT_KEY_EVENT,
        BUTTON_STATE_NUM_EDITING, BUTTON_STATE_TEXT_EDITING,
        BUTTON_STATE_TEXT_SELECTING, BUTTON_STATE_MENU_OPEN);
}

static void button_timers_tooltip_remove(bContext *C, uiBut *but)
{
    uiHandleButtonData *data;

    data= but->active;
    if(data) {

        if(data->tooltiptimer) {
            WM_event_remove_timer(data->wm, data->window, data->tooltiptimer);
            data->tooltiptimer= NULL;
        }
        if(data->tooltip) {
            ui_tooltip_free(C, data->tooltip);
            data->tooltip= NULL;
        }

        if(data->autoopentimer) {
            WM_event_remove_timer(data->wm, data->window, data->autoopentimer);
            data->autoopentimer= NULL;
        }
    }
}

static void button_tooltip_timer_reset(bContext *C, uiBut *but)
{
    wmWindowManager *wm= CTX_wm_manager(C);
    uiHandleButtonData *data;

    data= but->active;

    if(data->tooltiptimer) {
        WM_event_remove_timer(data->wm, data->window, data->tooltiptimer);
        data->tooltiptimer= NULL;
    }

    if(U.flag & USER_TOOLTIPS)
        if(!but->block->tooltipdisabled)
            if(!wm->drags.first)
                data->tooltiptimer= WM_event_add_timer(data->wm, data->window, TIMER, BUTTON_TOOLTIP_DELAY);
}

static void button_activate_state(bContext *C, uiBut *but, uiHandleButtonState state)
{
    uiHandleButtonData *data;

    data= but->active;
    if(data->state == state)
        return;

    /* highlight has timers for tooltips and auto open */
    if(state == BUTTON_STATE_HIGHLIGHT) {
        but->flag &= ~UI_SELECT;

        button_tooltip_timer_reset(C, but);

        /* automatic open pulldown block timer */
        if(ELEM3(but->type, BLOCK, PULLDOWN, ICONTEXTROW)) {
            if(data->used_mouse && !data->autoopentimer) {
                int time;

                if(but->block->auto_open==TRUE) time= 1;    // test for toolbox
                else if((but->block->flag & UI_BLOCK_LOOP && but->type != BLOCK) || but->block->auto_open==TRUE) time= 5*U.menuthreshold2;
                else if(U.uiflag & USER_MENUOPENAUTO) time= 5*U.menuthreshold1;
                else time= -1;

                if(time >= 0)
                    data->autoopentimer= WM_event_add_timer(data->wm, data->window, TIMER, 0.02*(double)time);
            }
        }
    }
    else {
        but->flag |= UI_SELECT;
        button_timers_tooltip_remove(C, but);
    }
    
    /* text editing */
    if(state == BUTTON_STATE_TEXT_EDITING && data->state != BUTTON_STATE_TEXT_SELECTING)
        ui_textedit_begin(C, but, data);
    else if(data->state == BUTTON_STATE_TEXT_EDITING && state != BUTTON_STATE_TEXT_SELECTING)
        ui_textedit_end(C, but, data);
    else if(data->state == BUTTON_STATE_TEXT_SELECTING && state != BUTTON_STATE_TEXT_EDITING)
        ui_textedit_end(C, but, data);
    
    /* number editing */
    if(state == BUTTON_STATE_NUM_EDITING) {
        if(ui_is_a_warp_but(but))
            WM_cursor_grab(CTX_wm_window(C), TRUE, TRUE, NULL);
        ui_numedit_begin(but, data);
    } else if(data->state == BUTTON_STATE_NUM_EDITING) {
        ui_numedit_end(but, data);
        if(ui_is_a_warp_but(but))
            WM_cursor_ungrab(CTX_wm_window(C));
    }
    /* menu open */
    if(state == BUTTON_STATE_MENU_OPEN)
        ui_blockopen_begin(C, but, data);
    else if(data->state == BUTTON_STATE_MENU_OPEN)
        ui_blockopen_end(C, but, data);

    /* add a short delay before exiting, to ensure there is some feedback */
    if(state == BUTTON_STATE_WAIT_FLASH) {
        data->flashtimer= WM_event_add_timer(data->wm, data->window, TIMER, BUTTON_FLASH_DELAY);
    }
    else if(data->flashtimer) {
        WM_event_remove_timer(data->wm, data->window, data->flashtimer);
        data->flashtimer= NULL;
    }

    /* add a blocking ui handler at the window handler for blocking, modal states
     * but not for popups, because we already have a window level handler*/
    if(!(but->block->handle && but->block->handle->popup)) {
        if(button_modal_state(state)) {
            if(!button_modal_state(data->state))
                WM_event_add_ui_handler(C, &data->window->modalhandlers, ui_handler_region_menu, NULL, data);
        }
        else {
            if(button_modal_state(data->state))
                WM_event_remove_ui_handler(&data->window->modalhandlers, ui_handler_region_menu, NULL, data, 1); /* 1 = postpone free */
        }
    }
    
    /* wait for mousemove to enable drag */
    if(state == BUTTON_STATE_WAIT_DRAG) {
        but->flag &= ~UI_SELECT;
    }

    data->state= state;

    if(state != BUTTON_STATE_EXIT) {
        /* When objects for eg. are removed, running ui_check_but() can access
           the removed data - so disable update on exit. Also in case of
           highlight when not in a popup menu, we remove because data used in
           button below popup might have been removed by action of popup. Needs
           a more reliable solution... */
        if(state != BUTTON_STATE_HIGHLIGHT || (but->block->flag & UI_BLOCK_LOOP))
            ui_check_but(but);
    }

    /* redraw */
    ED_region_tag_redraw(data->region);
}

static void button_activate_init(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type)
{
    uiHandleButtonData *data;

    /* setup struct */
    data= MEM_callocN(sizeof(uiHandleButtonData), "uiHandleButtonData");
    data->wm= CTX_wm_manager(C);
    data->window= CTX_wm_window(C);
    data->region= ar;
    if( ELEM(but->type, BUT_CURVE, SEARCH_MENU) );  // XXX curve is temp
    else data->interactive= 1;
    
    data->state = BUTTON_STATE_INIT;

    /* activate button */
    but->flag |= UI_ACTIVE;
    but->active= data;

    /* we disable auto_open in the block after a threshold, because we still
     * want to allow auto opening adjacent menus even if no button is activated
     * in between going over to the other button, but only for a short while */
    if(type == BUTTON_ACTIVATE_OVER && but->block->auto_open==TRUE)
        if(but->block->auto_open_last+BUTTON_AUTO_OPEN_THRESH < PIL_check_seconds_timer())
            but->block->auto_open= FALSE;

    if(type == BUTTON_ACTIVATE_OVER) {
        data->used_mouse= 1;
    }
    button_activate_state(C, but, BUTTON_STATE_HIGHLIGHT);
    
    /* activate right away */
    if(but->flag & UI_BUT_IMMEDIATE) {
        if(but->type==HOTKEYEVT)
            button_activate_state(C, but, BUTTON_STATE_WAIT_KEY_EVENT);
        /* .. more to be added here */
    }
    
    if(type == BUTTON_ACTIVATE_OPEN) {
        button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);

        /* activate first button in submenu */
        if(data->menu && data->menu->region) {
            ARegion *subar= data->menu->region;
            uiBlock *subblock= subar->uiblocks.first;
            uiBut *subbut;
            
            if(subblock) {
                subbut= ui_but_first(subblock);

                if(subbut)
                    ui_handle_button_activate(C, subar, subbut, BUTTON_ACTIVATE);
            }
        }
    }
    else if(type == BUTTON_ACTIVATE_TEXT_EDITING)
        button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
    else if(type == BUTTON_ACTIVATE_APPLY)
        button_activate_state(C, but, BUTTON_STATE_WAIT_FLASH);
}

static void button_activate_exit(bContext *C, uiHandleButtonData *data, uiBut *but, int mousemove, int onfree)
{
    uiBlock *block= but->block;
    uiBut *bt;

    /* ensure we are in the exit state */
    if(data->state != BUTTON_STATE_EXIT)
        button_activate_state(C, but, BUTTON_STATE_EXIT);

    /* apply the button action or value */
    if(!onfree)
        ui_apply_button(C, block, but, data, 0);

    /* if this button is in a menu, this will set the button return
     * value to the button value and the menu return value to ok, the
     * menu return value will be picked up and the menu will close */
    if(block->handle && !(block->flag & UI_BLOCK_KEEP_OPEN)) {
        if(!data->cancel || data->escapecancel) {
            uiPopupBlockHandle *menu;

            menu= block->handle;
            menu->butretval= data->retval;
            menu->menuretval= (data->cancel)? UI_RETURN_CANCEL: UI_RETURN_OK;
        }
    }

    if(!onfree && !data->cancel) {
        /* autokey & undo push */
        ui_apply_autokey_undo(C, but);

        /* popup menu memory */
        if(block->flag & UI_BLOCK_POPUP_MEMORY)
            ui_popup_menu_memory(block, but);
    }

    /* disable tooltips until mousemove + last active flag */
    for(block=data->region->uiblocks.first; block; block=block->next) {
        for(bt=block->buttons.first; bt; bt=bt->next)
            bt->flag &= ~UI_BUT_LAST_ACTIVE;

        block->tooltipdisabled= 1;
    }

    ui_blocks_set_tooltips(data->region, 0);

    /* clean up */
    if(data->str)
        MEM_freeN(data->str);
    if(data->origstr)
        MEM_freeN(data->origstr);

    /* redraw (data is but->active!) */
    ED_region_tag_redraw(data->region);
    
    /* clean up button */
    MEM_freeN(but->active);
    but->active= NULL;
    but->flag &= ~(UI_ACTIVE|UI_SELECT);
    but->flag |= UI_BUT_LAST_ACTIVE;
    if(!onfree)
        ui_check_but(but);

    /* adds empty mousemove in queue for re-init handler, in case mouse is
     * still over a button. we cannot just check for this ourselfs because
     * at this point the mouse may be over a button in another region */
    if(mousemove)
        WM_event_add_mousemove(C);
}

void ui_button_active_free(const bContext *C, uiBut *but)
{
    uiHandleButtonData *data;

    /* this gets called when the button somehow disappears while it is still
     * active, this is bad for user interaction, but we need to handle this
     * case cleanly anyway in case it happens */
    if(but->active) {
        data= but->active;
        data->cancel= 1;
        button_activate_exit((bContext*)C, data, but, 0, 1);
    }
}

/* returns the active button with an optional checking function */
static uiBut *ui_context_button_active(const bContext *C, int (*but_check_cb)(uiBut *))
{
    uiBut *but_found= NULL;

    ARegion *ar= CTX_wm_region(C);

    while(ar) {
        uiBlock *block;
        uiBut *but, *activebut= NULL;

        /* find active button */
        for(block=ar->uiblocks.first; block; block=block->next) {
            for(but=block->buttons.first; but; but= but->next) {
                if(but->active)
                    activebut= but;
                else if(!activebut && (but->flag & UI_BUT_LAST_ACTIVE))
                    activebut= but;
            }
        }

        if(activebut && (but_check_cb == NULL || but_check_cb(activebut))) {
            uiHandleButtonData *data= activebut->active;

            but_found= activebut;

            /* recurse into opened menu, like colorpicker case */
            if(data && data->menu && (ar != data->menu->region)) {
                ar = data->menu->region;
            }
            else {
                return but_found;
            }
        }
        else {
            /* no active button */
            return but_found;
        }
    }

    return but_found;
}

static int ui_context_rna_button_active_test(uiBut *but)
{
    return (but->rnapoin.data != NULL);
}
static uiBut *ui_context_rna_button_active(const bContext *C)
{
    return ui_context_button_active(C, ui_context_rna_button_active_test);
}

uiBut *uiContextActiveButton(const struct bContext *C)
{
    return ui_context_button_active(C, NULL);
}

/* helper function for insert keyframe, reset to default, etc operators */
void uiContextActiveProperty(const bContext *C, struct PointerRNA *ptr, struct PropertyRNA **prop, int *index)
{
    uiBut *activebut= ui_context_rna_button_active(C);

    memset(ptr, 0, sizeof(*ptr));

    if(activebut && activebut->rnapoin.data) {
        *ptr= activebut->rnapoin;
        *prop= activebut->rnaprop;
        *index= activebut->rnaindex;
    }
    else {
        *prop= NULL;
        *index= 0;
    }
}

void uiContextActivePropertyHandle(bContext *C)
{
    uiBut *activebut= ui_context_rna_button_active(C);
    if(activebut) {
        /* TODO, look into a better way to handle the button change
         * currently this is mainly so reset defaults works for the
         * operator redo panel - campbell */
        uiBlock *block= activebut->block;
        if (block->handle_func) {
            block->handle_func(C, block->handle_func_arg, 0);
        }
    }
}

wmOperator *uiContextActiveOperator(const struct bContext *C)
{
    ARegion *ar_ctx= CTX_wm_region(C);
    uiBlock *block;

    /* background mode */
    if (ar_ctx == NULL) {
        return NULL;
    }

    /* scan active regions ui */
    for(block=ar_ctx->uiblocks.first; block; block=block->next) {
        if (block->ui_operator) {
            return block->ui_operator;
        }
    }

    /* scan popups */
    {
        bScreen *sc= CTX_wm_screen(C);
        ARegion *ar;

        for (ar= sc->regionbase.first; ar; ar= ar->next) {
            if (ar == ar_ctx) {
                continue;
            }
            for(block=ar->uiblocks.first; block; block=block->next) {
                if (block->ui_operator) {
                    return block->ui_operator;
                }
            }
        }
    }

    return NULL;
}

/* helper function for insert keyframe, reset to default, etc operators */
void uiContextAnimUpdate(const bContext *C)
{
    Scene *scene= CTX_data_scene(C);
    ARegion *ar= CTX_wm_region(C);
    uiBlock *block;
    uiBut *but, *activebut;

    while(ar) {
        /* find active button */
        activebut= NULL;

        for(block=ar->uiblocks.first; block; block=block->next) {
            for(but=block->buttons.first; but; but= but->next) {
                ui_but_anim_flag(but, (scene)? scene->r.cfra: 0.0f);
                ED_region_tag_redraw(ar);
                
                if(but->active)
                    activebut= but;
                else if(!activebut && (but->flag & UI_BUT_LAST_ACTIVE))
                    activebut= but;
            }
        }

        if(activebut) {
            /* always recurse into opened menu, so all buttons update (like colorpicker) */
            uiHandleButtonData *data= activebut->active;
            if(data && data->menu)
                ar = data->menu->region;
            else
                return;
        }
        else {
            /* no active button */
            return;
        }
    }
}

/************** handle activating a button *************/

static uiBut *uit_but_find_open_event(ARegion *ar, wmEvent *event)
{
    uiBlock *block;
    uiBut *but;
    
    for(block=ar->uiblocks.first; block; block=block->next) {
        for(but=block->buttons.first; but; but= but->next)
            if(but==event->customdata)
                return but;
    }
    return NULL;
}

static int ui_handle_button_over(bContext *C, wmEvent *event, ARegion *ar)
{
    uiBut *but;

    if(event->type == MOUSEMOVE) {
        but= ui_but_find_mouse_over(ar, event->x, event->y);
        if(but)
            button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
    }
    else if(event->type == EVT_BUT_OPEN) {
        but= uit_but_find_open_event(ar, event);
        if(but) {
            button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
            ui_do_button(C, but->block, but, event);
        }
    }

    return WM_UI_HANDLER_CONTINUE;
}

/* exported to interface.c: uiButActiveOnly() */
void ui_button_activate_do(bContext *C, ARegion *ar, uiBut *but)
{
    wmWindow *win= CTX_wm_window(C);
    wmEvent event;
    
    button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
    
    event= *(win->eventstate);  /* XXX huh huh? make api call */
    event.type= EVT_BUT_OPEN;
    event.val= KM_PRESS;
    event.customdata= but;
    event.customdatafree= FALSE;
    
    ui_do_button(C, but->block, but, &event);
}

static void ui_handle_button_activate(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type)
{
    uiBut *oldbut;
    uiHandleButtonData *data;

    oldbut= ui_but_find_activated(ar);
    if(oldbut) {
        data= oldbut->active;
        data->cancel= 1;
        button_activate_exit(C, data, oldbut, 0, 0);
    }

    button_activate_init(C, ar, but, type);
}

/************ handle events for an activated button ***********/

static int ui_handle_button_event(bContext *C, wmEvent *event, uiBut *but)
{
    uiHandleButtonData *data;
    uiBlock *block;
    ARegion *ar;
    uiBut *postbut;
    uiButtonActivateType posttype;
    int retval;

    data= but->active;
    block= but->block;
    ar= data->region;

    retval= WM_UI_HANDLER_CONTINUE;
    
    if(data->state == BUTTON_STATE_HIGHLIGHT) {
        switch(event->type) {
            case WINDEACTIVATE:
            case EVT_BUT_CANCEL:
                data->cancel= 1;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                retval= WM_UI_HANDLER_CONTINUE;
                break;
            case MOUSEMOVE:
                /* verify if we are still over the button, if not exit */
                if(!ui_mouse_inside_button(ar, but, event->x, event->y)) {
                    data->cancel= 1;
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
                }
                else if(ui_but_find_mouse_over(ar, event->x, event->y) != but) {
                    data->cancel= 1;
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
                }
                else if(event->x!=event->prevx || event->y!=event->prevy) {
                    /* re-enable tooltip on mouse move */
                    ui_blocks_set_tooltips(ar, 1);
                    button_tooltip_timer_reset(C, but);
                }

                break;
            case TIMER: {
                /* handle tooltip timer */
                if(event->customdata == data->tooltiptimer) {
                    WM_event_remove_timer(data->wm, data->window, data->tooltiptimer);
                    data->tooltiptimer= NULL;

                    if(!data->tooltip)
                        data->tooltip= ui_tooltip_create(C, data->region, but);
                }
                /* handle menu auto open timer */
                else if(event->customdata == data->autoopentimer) {
                    WM_event_remove_timer(data->wm, data->window, data->autoopentimer);
                    data->autoopentimer= NULL;

                    if(ui_mouse_inside_button(ar, but, event->x, event->y))
                        button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
                }

                retval= WM_UI_HANDLER_CONTINUE;
                break;
            case WHEELUPMOUSE:
            case WHEELDOWNMOUSE:
            case MIDDLEMOUSE:
                /* XXX hardcoded keymap check... but anyway, while view changes, tooltips should be removed */
                if(data->tooltiptimer) {
                    WM_event_remove_timer(data->wm, data->window, data->tooltiptimer);
                    data->tooltiptimer= NULL;
                }
                /* pass on purposedly */
            default:
                /* handle button type specific events */
                retval= ui_do_button(C, block, but, event);
            }
        }
    }
    else if(data->state == BUTTON_STATE_WAIT_RELEASE) {
        switch(event->type) {
            case WINDEACTIVATE:
                data->cancel= 1;
                button_activate_state(C, but, BUTTON_STATE_EXIT);
                break;

            case MOUSEMOVE:
                if(ELEM(but->type,LINK, INLINK)) {
                    but->flag |= UI_SELECT;
                    ui_do_button(C, block, but, event);
                    ED_region_tag_redraw(data->region);
                }
                else {
                    /* deselect the button when moving the mouse away */
                    /* also de-activate for buttons that only show higlights */
                    if(ui_mouse_inside_button(ar, but, event->x, event->y)) {
                        if(!(but->flag & UI_SELECT)) {
                            but->flag |= (UI_SELECT|UI_ACTIVE);
                            data->cancel= 0;
                            ED_region_tag_redraw(data->region);
                        }
                    }
                    else {
                        if(but->flag & UI_SELECT) {
                            but->flag &= ~(UI_SELECT|UI_ACTIVE);
                            data->cancel= 1;
                            ED_region_tag_redraw(data->region);
                        }
                    }
                }               
                break;
            default:
                /* otherwise catch mouse release event */
                ui_do_button(C, block, but, event);
                break;
        }

        retval= WM_UI_HANDLER_BREAK;
    }
    else if(data->state == BUTTON_STATE_WAIT_FLASH) {
        switch(event->type) {
            case TIMER: {
                if(event->customdata == data->flashtimer)
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
            }
        }

        retval= WM_UI_HANDLER_CONTINUE;
    }
    else if(data->state == BUTTON_STATE_MENU_OPEN) {
        /* check for exit because of mouse-over another button */
        switch(event->type) {
            case MOUSEMOVE:
                
                if(data->menu && data->menu->region)
                    if(ui_mouse_inside_region(data->menu->region, event->x, event->y))
                        break;
            
            {
                uiBut *bt= ui_but_find_mouse_over(ar, event->x, event->y);

                if(bt && bt->active != data) {
                    if(but->type != COL) /* exception */
                        data->cancel= 1;
                    button_activate_state(C, but, BUTTON_STATE_EXIT);
                }
                break;
            }
        }

        ui_do_button(C, block, but, event);
        retval= WM_UI_HANDLER_CONTINUE;
    }
    else {
        retval= ui_do_button(C, block, but, event);
        // retval= WM_UI_HANDLER_BREAK; XXX why ? 
    }

    if(data->state == BUTTON_STATE_EXIT) {
        postbut= data->postbut;
        posttype= data->posttype;

        button_activate_exit(C, data, but, (postbut == NULL), 0);

        /* for jumping to the next button with tab while text editing */
        if(postbut)
            button_activate_init(C, ar, postbut, posttype);
    }

    return retval;
}

static int ui_handle_list_event(bContext *C, wmEvent *event, ARegion *ar)
{
    uiBut *but= ui_list_find_mouse_over(ar, event->x, event->y);
    int retval= WM_UI_HANDLER_CONTINUE;
    int value, min, max;

    if(but && (event->val == KM_PRESS)) {
        Panel *pa= but->block->panel;

        if(ELEM(event->type, UPARROWKEY, DOWNARROWKEY) ||
           ((ELEM(event->type, WHEELUPMOUSE, WHEELDOWNMOUSE) && event->alt))) {
            /* activate up/down the list */
            value= RNA_property_int_get(&but->rnapoin, but->rnaprop);

            if(ELEM(event->type, UPARROWKEY, WHEELUPMOUSE))
                value--;
            else
                value++;

            if(value < pa->list_scroll)
                pa->list_scroll= value;
            else if(value >= pa->list_scroll+pa->list_size)
                pa->list_scroll= value - pa->list_size + 1;

            RNA_property_int_range(&but->rnapoin, but->rnaprop, &min, &max);
            value= CLAMPIS(value, min, max);

            RNA_property_int_set(&but->rnapoin, but->rnaprop, value);
            RNA_property_update(C, &but->rnapoin, but->rnaprop);
            ED_region_tag_redraw(ar);

            retval= WM_UI_HANDLER_BREAK;
        }
        else if(ELEM(event->type, WHEELUPMOUSE, WHEELDOWNMOUSE) && event->shift) {
            /* silly replacement for proper grip */
            if(pa->list_grip_size == 0)
                pa->list_grip_size= pa->list_size;

            if(event->type == WHEELUPMOUSE)
                pa->list_grip_size--;
            else
                pa->list_grip_size++;

            pa->list_grip_size= MAX2(pa->list_grip_size, 1);

            ED_region_tag_redraw(ar);

            retval= WM_UI_HANDLER_BREAK;
        }
        else if(ELEM(event->type, WHEELUPMOUSE, WHEELDOWNMOUSE)) {
            /* list template will clamp */
            if(event->type == WHEELUPMOUSE)
                pa->list_scroll--;
            else
                pa->list_scroll++;

            ED_region_tag_redraw(ar);

            retval= WM_UI_HANDLER_BREAK;
        }
    }

    return retval;
}

static void ui_handle_button_return_submenu(bContext *C, wmEvent *event, uiBut *but)
{
    uiHandleButtonData *data;
    uiPopupBlockHandle *menu;

    data= but->active;
    menu= data->menu;

    /* copy over return values from the closing menu */
    if((menu->menuretval & UI_RETURN_OK) || (menu->menuretval & UI_RETURN_UPDATE)) {
        if(but->type == COL)
            copy_v3_v3(data->vec, menu->retvec);
        else if(ELEM3(but->type, MENU, ICONROW, ICONTEXTROW))
            data->value= menu->retvalue;
    }

    if(menu->menuretval & UI_RETURN_UPDATE) {
        if(data->interactive) ui_apply_button(C, but->block, but, data, 1);
        else ui_check_but(but);

        menu->menuretval= 0;
    }
    
    /* now change button state or exit, which will close the submenu */
    if((menu->menuretval & UI_RETURN_OK) || (menu->menuretval & UI_RETURN_CANCEL)) {
        if(menu->menuretval != UI_RETURN_OK)
            data->cancel= 1;

        button_activate_exit(C, data, but, 1, 0);
    }
    else if(menu->menuretval & UI_RETURN_OUT) {
        if(event->type==MOUSEMOVE && ui_mouse_inside_button(data->region, but, event->x, event->y)) {
            button_activate_state(C, but, BUTTON_STATE_HIGHLIGHT);
        }
        else {
            if (ISKEYBOARD(event->type)) {
                /* keyboard menu hierarchy navigation, going back to previous level */
                but->active->used_mouse= 0;
                button_activate_state(C, but, BUTTON_STATE_HIGHLIGHT);
            }
            else {
                data->cancel= 1;
                button_activate_exit(C, data, but, 1, 0);
            }
        }
    }
}

/* ************************* menu handling *******************************/

/* function used to prevent loosing the open menu when using nested pulldowns,
 * when moving mouse towards the pulldown menu over other buttons that could
 * steal the highlight from the current button, only checks:
 *
 * - while mouse moves in triangular area defined old mouse position and
 *   left/right side of new menu
 * - only for 1 second
 */

static void ui_mouse_motion_towards_init(uiPopupBlockHandle *menu, int mx, int my, int force)
{
    if(!menu->dotowards || force) {
        menu->dotowards= 1;
        menu->towardsx= mx;
        menu->towardsy= my;

        if(force)
            menu->towardstime= DBL_MAX; /* unlimited time */
        else
            menu->towardstime= PIL_check_seconds_timer();
    }
}

static int ui_mouse_motion_towards_check(uiBlock *block, uiPopupBlockHandle *menu, int mx, int my)
{
    float p1[2], p2[2], p3[2], p4[2], oldp[2], newp[2];
    int closer;

    if(!menu->dotowards) return 0;

    /* verify that we are moving towards one of the edges of the
     * menu block, in other words, in the triangle formed by the
     * initial mouse location and two edge points. */
    p1[0]= block->minx-20;
    p1[1]= block->miny-20;

    p2[0]= block->maxx+20;
    p2[1]= block->miny-20;
    
    p3[0]= block->maxx+20;
    p3[1]= block->maxy+20;

    p4[0]= block->minx-20;
    p4[1]= block->maxy+20;

    oldp[0]= menu->towardsx;
    oldp[1]= menu->towardsy;

    newp[0]= mx;
    newp[1]= my;

    if(len_v2v2(oldp, newp) < 4.0f)
        return menu->dotowards;

    closer= 0;
    closer |= isect_point_tri_v2(newp, oldp, p1, p2);
    closer |= isect_point_tri_v2(newp, oldp, p2, p3);
    closer |= isect_point_tri_v2(newp, oldp, p3, p4);
    closer |= isect_point_tri_v2(newp, oldp, p4, p1);

    if(!closer)
        menu->dotowards= 0;

    /* 1 second timer */
    if(PIL_check_seconds_timer() - menu->towardstime > BUTTON_MOUSE_TOWARDS_THRESH)
        menu->dotowards= 0;

    return menu->dotowards;
}

static char ui_menu_scroll_test(uiBlock *block, int my)
{
    if(block->flag & (UI_BLOCK_CLIPTOP|UI_BLOCK_CLIPBOTTOM)) {
        if(block->flag & UI_BLOCK_CLIPTOP) 
            if(my > block->maxy-14)
                return 't';
        if(block->flag & UI_BLOCK_CLIPBOTTOM)
            if(my < block->miny+14)
                return 'b';
    }
    return 0;
}

static int ui_menu_scroll(ARegion *ar, uiBlock *block, int my)
{
    char test= ui_menu_scroll_test(block, my);
    
    if(test) {
        uiBut *b1= block->buttons.first;
        uiBut *b2= block->buttons.last;
        uiBut *bnext;
        uiBut *bprev;
        int dy= 0;
        
        /* get first and last visible buttons */
        while(b1 && ui_but_next(b1) && (b1->flag & UI_SCROLLED))
            b1= ui_but_next(b1);
        while(b2 && ui_but_prev(b2) && (b2->flag & UI_SCROLLED))
            b2= ui_but_prev(b2);
        /* skips separators */
        bnext= ui_but_next(b1);
        bprev= ui_but_prev(b2);
        
        if(bnext==NULL || bprev==NULL)
            return 0;
        
        if(test=='t') {
            /* bottom button is first button */
            if(b1->y1 < b2->y1)
                dy= bnext->y1 - b1->y1;
            /* bottom button is last button */
            else 
                dy= bprev->y1 - b2->y1;
        }
        else if(test=='b') {
            /* bottom button is first button */
            if(b1->y1 < b2->y1)
                dy= b1->y1 - bnext->y1;
            /* bottom button is last button */
            else 
                dy= b2->y1 - bprev->y1;
        }
        if(dy) {
            
            for(b1= block->buttons.first; b1; b1= b1->next) {
                b1->y1 -= dy;
                b1->y2 -= dy;
            }
            /* set flags again */
            ui_popup_block_scrolltest(block);
            
            ED_region_tag_redraw(ar);
            
            return 1;
        }
    }
    
    return 0;
}

static int ui_handle_menu_event(bContext *C, wmEvent *event, uiPopupBlockHandle *menu, int UNUSED(topmenu))
{
    ARegion *ar;
    uiBlock *block;
    uiBut *but, *bt;
    int inside, act, count, mx, my, retval;

    ar= menu->region;
    block= ar->uiblocks.first;
    
    act= 0;
    retval= WM_UI_HANDLER_CONTINUE;

    mx= event->x;
    my= event->y;
    ui_window_to_block(ar, block, &mx, &my);

    /* check if mouse is inside block */
    inside= 0;
    if(block->minx <= mx && block->maxx >= mx)
        if(block->miny <= my && block->maxy >= my)
            inside= 1;

    /* if there's an active modal button, don't check events or outside, except for search menu */
    but= ui_but_find_activated(ar);
    if(but && button_modal_state(but->active->state) && but->type!=SEARCH_MENU) {
        /* if a button is activated modal, always reset the start mouse
         * position of the towards mechanism to avoid loosing focus,
         * and don't handle events */
        ui_mouse_motion_towards_init(menu, mx, my, 1);
    }
    else if(event->type == TIMER) {
        if(event->customdata == menu->scrolltimer)
            ui_menu_scroll(ar, block, my);
    }
    else {
        /* for ui_mouse_motion_towards_block */
        if(event->type == MOUSEMOVE) {
            ui_mouse_motion_towards_init(menu, mx, my, 0);
            
            /* add menu scroll timer, if needed */
            if(ui_menu_scroll_test(block, my))
                if(menu->scrolltimer==NULL)
                    menu->scrolltimer= 
                    WM_event_add_timer(CTX_wm_manager(C), CTX_wm_window(C), TIMER, MENU_SCROLL_INTERVAL);
        }
        
        /* first block own event func */
        if(block->block_event_func && block->block_event_func(C, block, event));
        /* events not for active search menu button */
        else if(but==NULL || but->type!=SEARCH_MENU) {
            switch(event->type) {
                /* closing sublevels of pulldowns */
                case LEFTARROWKEY:
                    if(event->val==KM_PRESS && (block->flag & UI_BLOCK_LOOP))
                        if(block->saferct.first)
                            menu->menuretval= UI_RETURN_OUT;

                    retval= WM_UI_HANDLER_BREAK;
                    break;

                /* opening sublevels of pulldowns */
                case RIGHTARROWKEY: 
                    if(event->val==KM_PRESS && (block->flag & UI_BLOCK_LOOP)) {
                        but= ui_but_find_activated(ar);

                        if(!but) {
                            /* no item active, we make first active */
                            if(block->direction & UI_TOP) but= ui_but_last(block);
                            else but= ui_but_first(block);
                        }

                        if(but && ELEM(but->type, BLOCK, PULLDOWN))
                            ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_OPEN);
                    }

                    retval= WM_UI_HANDLER_BREAK;
                    break;
                
                case UPARROWKEY:
                case DOWNARROWKEY:
                case WHEELUPMOUSE:
                case WHEELDOWNMOUSE:
                    /* arrowkeys: only handle for block_loop blocks */
                    if(event->alt || event->shift || event->ctrl || event->oskey);
                    else if(inside || (block->flag & UI_BLOCK_LOOP)) {
                        if(event->val==KM_PRESS) {
                            but= ui_but_find_activated(ar);
                            if(but) {
                                /* is there a situation where UI_LEFT or UI_RIGHT would also change navigation direction? */
                                if( ((ELEM(event->type, DOWNARROWKEY, WHEELDOWNMOUSE)) && (block->direction & UI_DOWN)) ||
                                    ((ELEM(event->type, DOWNARROWKEY, WHEELDOWNMOUSE)) && (block->direction & UI_RIGHT)) ||
                                    ((ELEM(event->type, UPARROWKEY, WHEELUPMOUSE)) && (block->direction & UI_TOP))
                                ) {
                                    /* the following is just a hack - uiBut->type set to BUT and BUTM have there menus built 
                                     * opposite ways - this should be changed so that all popup-menus use the same uiBlock->direction */
                                    if(but->type & BUT)
                                        but= ui_but_next(but);
                                    else
                                        but= ui_but_prev(but);
                                }
                                else {
                                    if(but->type & BUT)
                                        but= ui_but_prev(but);
                                    else
                                        but= ui_but_next(but);
                                }

                                if(but)
                                    ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE);
                            }

                            if(!but) {
                                if( ((ELEM(event->type, UPARROWKEY, WHEELUPMOUSE)) && (block->direction & UI_DOWN)) ||
                                    ((ELEM(event->type, UPARROWKEY, WHEELUPMOUSE)) && (block->direction & UI_RIGHT)) ||
                                    ((ELEM(event->type, DOWNARROWKEY, WHEELDOWNMOUSE)) && (block->direction & UI_TOP))
                                ) {
                                    if((bt= ui_but_first(block)) && (bt->type & BUT)) {
                                        bt= ui_but_last(block);
                                    }
                                    else {
                                        /* keep ui_but_first() */
                                    }
                                }
                                else {
                                    if((bt= ui_but_first(block)) && (bt->type & BUT)) {
                                        /* keep ui_but_first() */
                                    }
                                    else {
                                        bt= ui_but_last(block);
                                    }
                                }

                                if(bt)
                                    ui_handle_button_activate(C, ar, bt, BUTTON_ACTIVATE);
                            }
                        }

                        retval= WM_UI_HANDLER_BREAK;
                    }

                    break;

                case ONEKEY:    case PAD1:
                    act= 1;
                case TWOKEY:    case PAD2:
                    if(act==0) act= 2;
                case THREEKEY:  case PAD3:
                    if(act==0) act= 3;
                case FOURKEY:   case PAD4:
                    if(act==0) act= 4;
                case FIVEKEY:   case PAD5:
                    if(act==0) act= 5;
                case SIXKEY:    case PAD6:
                    if(act==0) act= 6;
                case SEVENKEY:  case PAD7:
                    if(act==0) act= 7;
                case EIGHTKEY:  case PAD8:
                    if(act==0) act= 8;
                case NINEKEY:   case PAD9:
                    if(act==0) act= 9;
                case ZEROKEY:   case PAD0:
                    if(act==0) act= 10;
                
                    if((block->flag & UI_BLOCK_NUMSELECT) && event->val==KM_PRESS) {
                        if(event->alt) act+= 10;
                        
                        count= 0;
                        for(but= block->buttons.first; but; but= but->next) {
                            int doit= 0;
                            
                            if(but->type!=LABEL && but->type!=SEPR)
                                count++;
                            
                            /* exception for rna layer buts */
                            if(but->rnapoin.data && but->rnaprop) {
                                if (ELEM(RNA_property_subtype(but->rnaprop), PROP_LAYER, PROP_LAYER_MEMBER)) {
                                    if (but->rnaindex== act-1)
                                        doit=1;
                                }
                            }
                            /* exception for menus like layer buts, with button aligning they're not drawn in order */
                            else if(but->type==TOGR) {
                                if(but->bitnr==act-1)
                                    doit= 1;
                            }
                            else if(count==act)
                                doit=1;
                            
                            if(doit) {
                                ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_APPLY);
                                break;
                            }
                        }

                        retval= WM_UI_HANDLER_BREAK;
                    }
                    break;

                /* Handle keystrokes on menu items */
                case AKEY:
                case BKEY:
                case CKEY:
                case DKEY:
                case EKEY:
                case FKEY:
                case GKEY:
                case HKEY:
                case IKEY:
                case JKEY:
                case KKEY:
                case LKEY:
                case MKEY:
                case NKEY:
                case OKEY:
                case PKEY:
                case QKEY:
                case RKEY:
                case SKEY:
                case TKEY:
                case UKEY:
                case VKEY:
                case WKEY:
                case XKEY:
                case YKEY:
                case ZKEY:
                {
                    if( (event->val == KM_PRESS) &&
                        (event->shift == FALSE) &&
                        (event->ctrl ==  FALSE) &&
                        (event->oskey == FALSE)
                    ) {
                        for(but= block->buttons.first; but; but= but->next) {

                            if(but->menu_key==event->type) {
                                if(but->type == BUT) {
                                    /* mainly for operator buttons */
                                    ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_APPLY);
                                }
                                else if(ELEM(but->type, BLOCK, PULLDOWN)) {
                                    /* open submenus (like right arrow key) */
                                    ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_OPEN);
                                }
                                else if (but->type == MENU) {
                                    /* activate menu items */
                                    ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE);
                                }
                                else {
                                    printf("%s: error, but->menu_key type: %d\n", __func__, but->type);
                                }

                                break;
                            }
                        }

                        retval= WM_UI_HANDLER_BREAK;
                    }
                    break;
                }
            }
        }
        
        /* here we check return conditions for menus */
        if(block->flag & UI_BLOCK_LOOP) {
            /* if we click outside the block, verify if we clicked on the
             * button that opened us, otherwise we need to close */
            if(inside==0) {
                uiSafetyRct *saferct= block->saferct.first;

                if(ELEM3(event->type, LEFTMOUSE, MIDDLEMOUSE, RIGHTMOUSE) && event->val==KM_PRESS) {
                    if(saferct && !BLI_in_rctf(&saferct->parent, event->x, event->y)) {
                        if(block->flag & (UI_BLOCK_OUT_1))
                            menu->menuretval= UI_RETURN_OK;
                        else
                            menu->menuretval= UI_RETURN_OUT;
                    }
                }
            }

            if(menu->menuretval);
            else if(event->type==ESCKEY && event->val==KM_PRESS) {
                /* esc cancels this and all preceding menus */
                menu->menuretval= UI_RETURN_CANCEL;
            }
            else if(ELEM(event->type, RETKEY, PADENTER) && event->val==KM_PRESS) {
                /* enter will always close this block, we let the event
                 * get handled by the button if it is activated, otherwise we cancel */
                if(!ui_but_find_activated(ar))
                    menu->menuretval= UI_RETURN_CANCEL | UI_RETURN_POPUP_OK;
            }
            else {
                ui_mouse_motion_towards_check(block, menu, mx, my);

                /* check mouse moving outside of the menu */
                if(inside==0 && (block->flag & UI_BLOCK_MOVEMOUSE_QUIT)) {
                    uiSafetyRct *saferct;
                    
                    /* check for all parent rects, enables arrowkeys to be used */
                    for(saferct=block->saferct.first; saferct; saferct= saferct->next) {
                        /* for mouse move we only check our own rect, for other
                         * events we check all preceding block rects too to make
                         * arrow keys navigation work */
                        if(event->type!=MOUSEMOVE || saferct==block->saferct.first) {
                            if(BLI_in_rctf(&saferct->parent, (float)event->x, (float)event->y))
                                break;
                            if(BLI_in_rctf(&saferct->safety, (float)event->x, (float)event->y))
                                break;
                        }
                    }

                    /* strict check, and include the parent rect */
                    if(!menu->dotowards && !saferct) {
                        if(block->flag & (UI_BLOCK_OUT_1))
                            menu->menuretval= UI_RETURN_OK;
                        else
                            menu->menuretval= UI_RETURN_OUT;
                    }
                    else if(menu->dotowards && event->type==MOUSEMOVE)
                        retval= WM_UI_HANDLER_BREAK;
                }
            }
        }
    }

    /* if we are didn't handle the event yet, lets pass it on to
     * buttons inside this region. disabled inside check .. not sure
     * anymore why it was there? but it meant enter didn't work
     * for example when mouse was not over submenu */
    if((/*inside &&*/ (!menu->menuretval || (menu->menuretval & UI_RETURN_UPDATE)) && retval == WM_UI_HANDLER_CONTINUE) || event->type == TIMER) {
        but= ui_but_find_activated(ar);

        if(but) {
            ScrArea *ctx_area= CTX_wm_area(C);
            ARegion *ctx_region= CTX_wm_region(C);
            
            if(menu->ctx_area) CTX_wm_area_set(C, menu->ctx_area);
            if(menu->ctx_region) CTX_wm_region_set(C, menu->ctx_region);
            
            retval= ui_handle_button_event(C, event, but);
            
            if(menu->ctx_area) CTX_wm_area_set(C, ctx_area);
            if(menu->ctx_region) CTX_wm_region_set(C, ctx_region);
        }
        else
            retval= ui_handle_button_over(C, event, ar);
    }

    /* if we set a menu return value, ensure we continue passing this on to
     * lower menus and buttons, so always set continue then, and if we are
     * inside the region otherwise, ensure we swallow the event */
    if(menu->menuretval)
        return WM_UI_HANDLER_CONTINUE;
    else if(inside)
        return WM_UI_HANDLER_BREAK;
    else
        return retval;
}

static int ui_handle_menu_return_submenu(bContext *C, wmEvent *event, uiPopupBlockHandle *menu)
{
    ARegion *ar;
    uiBut *but;
    uiBlock *block;
    uiHandleButtonData *data;
    uiPopupBlockHandle *submenu;
    int mx, my, update;

    ar= menu->region;
    block= ar->uiblocks.first;

    but= ui_but_find_activated(ar);
    data= but->active;
    submenu= data->menu;

    if(submenu->menuretval) {
        /* first decide if we want to close our own menu cascading, if
         * so pass on the sub menu return value to our own menu handle */
        if((submenu->menuretval & UI_RETURN_OK) || (submenu->menuretval & UI_RETURN_CANCEL)) {
            if(!(block->flag & UI_BLOCK_KEEP_OPEN)) {
                menu->menuretval= submenu->menuretval;
                menu->butretval= data->retval;
            }
        }

        update= (submenu->menuretval & UI_RETURN_UPDATE);

        /* now let activated button in this menu exit, which
         * will actually close the submenu too */
        ui_handle_button_return_submenu(C, event, but);

        if(update)
            submenu->menuretval = 0;
    }

    /* for cases where close does not cascade, allow the user to
     * move the mouse back towards the menu without closing */
    mx= event->x;
    my= event->y;
    ui_window_to_block(ar, block, &mx, &my);
    ui_mouse_motion_towards_init(menu, mx, my, 1);

    if(menu->menuretval)
        return WM_UI_HANDLER_CONTINUE;
    else
        return WM_UI_HANDLER_BREAK;
}

static int ui_handle_menus_recursive(bContext *C, wmEvent *event, uiPopupBlockHandle *menu)
{
    uiBut *but;
    uiHandleButtonData *data;
    uiPopupBlockHandle *submenu;
    int retval= WM_UI_HANDLER_CONTINUE;

    /* check if we have a submenu, and handle events for it first */
    but= ui_but_find_activated(menu->region);
    data= (but)? but->active: NULL;
    submenu= (data)? data->menu: NULL;

    if(submenu)
        retval= ui_handle_menus_recursive(C, event, submenu);

    /* now handle events for our own menu */
    if(retval == WM_UI_HANDLER_CONTINUE || event->type == TIMER) {
        if(submenu && submenu->menuretval)
            retval= ui_handle_menu_return_submenu(C, event, menu);
        else
            retval= ui_handle_menu_event(C, event, menu, (submenu == NULL));
    }

    return retval;
}

/* *************** UI event handlers **************** */

static int ui_handler_region(bContext *C, wmEvent *event, void *UNUSED(userdata))
{
    ARegion *ar;
    uiBut *but;
    int retval;

    /* here we handle buttons at the region level, non-modal */
    ar= CTX_wm_region(C);
    retval= WM_UI_HANDLER_CONTINUE;

    if(ar==NULL) return retval;
    if(ar->uiblocks.first==NULL) return retval;

    /* either handle events for already activated button or try to activate */
    but= ui_but_find_activated(ar);

    retval= ui_handler_panel_region(C, event);

    if(retval == WM_UI_HANDLER_CONTINUE)
        retval= ui_handle_list_event(C, event, ar);

    if(retval == WM_UI_HANDLER_CONTINUE) {
        if(but)
            retval= ui_handle_button_event(C, event, but);
        else
            retval= ui_handle_button_over(C, event, ar);
    }

    /* re-enable tooltips */
    if(event->type == MOUSEMOVE && (event->x!=event->prevx || event->y!=event->prevy))
        ui_blocks_set_tooltips(ar, 1);
    
    /* delayed apply callbacks */
    ui_apply_but_funcs_after(C);

    return retval;
}

static void ui_handler_remove_region(bContext *C, void *UNUSED(userdata))
{
    bScreen *sc;
    ARegion *ar;

    ar= CTX_wm_region(C);
    if(ar == NULL) return;

    uiFreeBlocks(C, &ar->uiblocks);
    
    sc= CTX_wm_screen(C);
    if(sc == NULL) return;

    /* delayed apply callbacks, but not for screen level regions, those
     * we rather do at the very end after closing them all, which will
     * be done in ui_handler_region/window */
    if(BLI_findindex(&sc->regionbase, ar) == -1)
        ui_apply_but_funcs_after(C);
}

static int ui_handler_region_menu(bContext *C, wmEvent *event, void *UNUSED(userdata))
{
    ARegion *ar;
    uiBut *but;
    uiHandleButtonData *data;
    int retval;

    /* here we handle buttons at the window level, modal, for example
     * while number sliding, text editing, or when a menu block is open */
    ar= CTX_wm_menu(C);
    if(!ar)
        ar= CTX_wm_region(C);

    but= ui_but_find_activated(ar);

    if(but) {
        /* handle activated button events */
        data= but->active;

        if(data->state == BUTTON_STATE_MENU_OPEN) {
            /* handle events for menus and their buttons recursively,
             * this will handle events from the top to the bottom menu */
            retval= ui_handle_menus_recursive(C, event, data->menu);

            /* handle events for the activated button */
            if(retval == WM_UI_HANDLER_CONTINUE || event->type == TIMER) {
                if(data->menu->menuretval)
                    ui_handle_button_return_submenu(C, event, but);
                else
                    ui_handle_button_event(C, event, but);
            }
        }
        else {
            /* handle events for the activated button */
            ui_handle_button_event(C, event, but);
        }
    }

    /* re-enable tooltips */
    if(event->type == MOUSEMOVE && (event->x!=event->prevx || event->y!=event->prevy))
        ui_blocks_set_tooltips(ar, 1);

    /* delayed apply callbacks */
    ui_apply_but_funcs_after(C);

    /* we block all events, this is modal interaction */
    return WM_UI_HANDLER_BREAK;
}

/* two types of popups, one with operator + enum, other with regular callbacks */
static int ui_handler_popup(bContext *C, wmEvent *event, void *userdata)
{
    uiPopupBlockHandle *menu= userdata;

    ui_handle_menus_recursive(C, event, menu);

    /* free if done, does not free handle itself */
    if(menu->menuretval) {
        /* copy values, we have to free first (closes region) */
        uiPopupBlockHandle temp= *menu;
        
        ui_popup_block_free(C, menu);
        UI_remove_popup_handlers(&CTX_wm_window(C)->modalhandlers, menu);

        if((temp.menuretval & UI_RETURN_OK) || (temp.menuretval & UI_RETURN_POPUP_OK)) {
            if(temp.popup_func)
                temp.popup_func(C, temp.popup_arg, temp.retvalue);
            if(temp.optype)
                WM_operator_name_call(C, temp.optype->idname, temp.opcontext, NULL);
        }
        else if(temp.cancel_func)
            temp.cancel_func(temp.popup_arg);
    }
    else {
        /* re-enable tooltips */
        if(event->type == MOUSEMOVE && (event->x!=event->prevx || event->y!=event->prevy))
            ui_blocks_set_tooltips(menu->region, 1);
    }

    /* delayed apply callbacks */
    ui_apply_but_funcs_after(C);

    /* we block all events, this is modal interaction */
    return WM_UI_HANDLER_BREAK;
}

static void ui_handler_remove_popup(bContext *C, void *userdata)
{
    uiPopupBlockHandle *menu= userdata;

    /* free menu block if window is closed for some reason */
    ui_popup_block_free(C, menu);

    /* delayed apply callbacks */
    ui_apply_but_funcs_after(C);
}

void UI_add_region_handlers(ListBase *handlers)
{
    WM_event_remove_ui_handler(handlers, ui_handler_region, ui_handler_remove_region, NULL, 0);
    WM_event_add_ui_handler(NULL, handlers, ui_handler_region, ui_handler_remove_region, NULL);
}

void UI_add_popup_handlers(bContext *C, ListBase *handlers, uiPopupBlockHandle *popup)
{
    WM_event_add_ui_handler(C, handlers, ui_handler_popup, ui_handler_remove_popup, popup);
}

void UI_remove_popup_handlers(ListBase *handlers, uiPopupBlockHandle *popup)
{
    WM_event_remove_ui_handler(handlers, ui_handler_popup, ui_handler_remove_popup, popup, 0);
}