area.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 <string.h>
#include <stdio.h>

#include "MEM_guardedalloc.h"

#include "DNA_userdef_types.h"

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

#include "BLF_translation.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_screen.h"

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

#include "ED_screen.h"
#include "ED_screen_types.h"
#include "ED_space_api.h"
#include "ED_types.h"
#include "ED_fileselect.h" 

#include "BIF_gl.h"
#include "BIF_glutil.h"
#include "BLF_api.h"

#include "UI_interface.h"
#include "UI_resources.h"
#include "UI_view2d.h"

#include "screen_intern.h"

/* general area and region code */

static void region_draw_emboss(ARegion *ar, rcti *scirct)
{
    rcti rect;
    
    /* translate scissor rect to region space */
    rect.xmin= scirct->xmin - ar->winrct.xmin;
    rect.ymin= scirct->ymin - ar->winrct.ymin;
    rect.xmax= scirct->xmax - ar->winrct.xmin;
    rect.ymax= scirct->ymax - ar->winrct.ymin;
    
    /* set transp line */
    glEnable( GL_BLEND );
    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
    
    /* right  */
    glColor4ub(0,0,0, 30);
    sdrawline(rect.xmax, rect.ymin, rect.xmax, rect.ymax);
    
    /* bottom  */
    glColor4ub(0,0,0, 30);
    sdrawline(rect.xmin, rect.ymin, rect.xmax, rect.ymin);
    
    /* top  */
    glColor4ub(255,255,255, 30);
    sdrawline(rect.xmin, rect.ymax, rect.xmax, rect.ymax);

    /* left  */
    glColor4ub(255,255,255, 30);
    sdrawline(rect.xmin, rect.ymin, rect.xmin, rect.ymax);
    
    glDisable( GL_BLEND );
}

void ED_region_pixelspace(ARegion *ar)
{
    int width= ar->winrct.xmax-ar->winrct.xmin+1;
    int height= ar->winrct.ymax-ar->winrct.ymin+1;
    
    wmOrtho2(-0.375f, (float)width-0.375f, -0.375f, (float)height-0.375f);
    glLoadIdentity();
}

/* only exported for WM */
void ED_region_do_listen(ARegion *ar, wmNotifier *note)
{
    /* generic notes first */
    switch(note->category) {
        case NC_WM:
            if(note->data==ND_FILEREAD)
                ED_region_tag_redraw(ar);
            break;
        case NC_WINDOW:
            ED_region_tag_redraw(ar);
            break;
    }

    if(ar->type && ar->type->listener)
        ar->type->listener(ar, note);
}

/* only exported for WM */
void ED_area_do_listen(ScrArea *sa, wmNotifier *note)
{
    /* no generic notes? */
    if(sa->type && sa->type->listener) {
        sa->type->listener(sa, note);
    }
}

/* only exported for WM */
void ED_area_do_refresh(bContext *C, ScrArea *sa)
{
    /* no generic notes? */
    if(sa->type && sa->type->refresh) {
        sa->type->refresh(C, sa);
    }
    sa->do_refresh= 0;
}

/* based on screen region draw tags, set draw tags in azones, and future region tabs etc */
/* only exported for WM */
void ED_area_overdraw_flush(ScrArea *sa, ARegion *ar)
{
    AZone *az;
    
    for(az= sa->actionzones.first; az; az= az->next) {
        int xs, ys;
        
        xs= (az->x1+az->x2)/2;
        ys= (az->y1+az->y2)/2;

        /* test if inside */
        if(BLI_in_rcti(&ar->winrct, xs, ys)) {
            az->do_draw= 1;
        }
    }
}

static void area_draw_azone(short x1, short y1, short x2, short y2)
{
    int dx = x2 - x1;
    int dy = y2 - y1;

    dx= copysign(ceil(0.3f*fabs(dx)), dx);
    dy= copysign(ceil(0.3f*fabs(dy)), dy);

    glEnable(GL_BLEND);
    glEnable(GL_LINE_SMOOTH);
    
    glColor4ub(255, 255, 255, 180);
    fdrawline(x1, y2, x2, y1);
    glColor4ub(255, 255, 255, 130);
    fdrawline(x1, y2-dy, x2-dx, y1);
    glColor4ub(255, 255, 255, 80);
    fdrawline(x1, y2-2*dy, x2-2*dx, y1);
    
    glColor4ub(0, 0, 0, 210);
    fdrawline(x1, y2+1, x2+1, y1);
    glColor4ub(0, 0, 0, 180);
    fdrawline(x1, y2-dy+1, x2-dx+1, y1);
    glColor4ub(0, 0, 0, 150);
    fdrawline(x1, y2-2*dy+1, x2-2*dx+1, y1);

    glDisable(GL_LINE_SMOOTH);
    glDisable(GL_BLEND);
}

static void region_draw_azone_icon(AZone *az)
{
    GLUquadricObj *qobj = NULL; 
    short midx = az->x1 + (az->x2 - az->x1)/2;
    short midy = az->y1 + (az->y2 - az->y1)/2;
        
    qobj = gluNewQuadric();
    
    glPushMatrix();     
    glTranslatef(midx, midy, 0.); 
    
    /* outlined circle */
    glEnable(GL_LINE_SMOOTH);

    glColor4f(1.f, 1.f, 1.f, 0.8f);

    gluQuadricDrawStyle(qobj, GLU_FILL); 
    gluDisk( qobj, 0.0,  4.25f, 16, 1); 

    glColor4f(0.2f, 0.2f, 0.2f, 0.9f);
    
    gluQuadricDrawStyle(qobj, GLU_SILHOUETTE); 
    gluDisk( qobj, 0.0,  4.25f, 16, 1); 
    
    glDisable(GL_LINE_SMOOTH);
    
    glPopMatrix();
    gluDeleteQuadric(qobj);
    
    /* + */
    sdrawline(midx, midy-2, midx, midy+3);
    sdrawline(midx-2, midy, midx+3, midy);
}

static void draw_azone_plus(float x1, float y1, float x2, float y2)
{
    float width = 2.0f;
    float pad = 4.0f;
    
    glRectf((x1 + x2 - width)*0.5f, y1 + pad, (x1 + x2 + width)*0.5f, y2 - pad);
    glRectf(x1 + pad, (y1 + y2 - width)*0.5f, (x1 + x2 - width)*0.5f, (y1 + y2 + width)*0.5f);
    glRectf((x1 + x2 + width)*0.5f, (y1 + y2 - width)*0.5f, x2 - pad, (y1 + y2 + width)*0.5f);
}

static void region_draw_azone_tab_plus(AZone *az)
{
    extern void ui_draw_anti_tria(float x1, float y1, float x2, float y2, float x3, float y3); /* xxx temp */
    
    glEnable(GL_BLEND);
    
    /* add code to draw region hidden as 'too small' */
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            uiSetRoundBox(UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT);
            break;
        case AE_BOTTOM_TO_TOPLEFT:
            uiSetRoundBox(UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT);
            break;
        case AE_LEFT_TO_TOPRIGHT:
            uiSetRoundBox(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT);
            break;
        case AE_RIGHT_TO_TOPLEFT:
            uiSetRoundBox(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT);
            break;
    }

    glColor4f(0.05f, 0.05f, 0.05f, 0.4f);
    uiRoundBox((float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f);

    glEnable(GL_BLEND);

    glColor4f(0.8f, 0.8f, 0.8f, 0.4f);
    draw_azone_plus((float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2);

    glDisable(GL_BLEND);
}

static void region_draw_azone_tab(AZone *az)
{
    float col[3];
    
    glEnable(GL_BLEND);
    UI_GetThemeColor3fv(TH_HEADER, col);
    glColor4f(col[0], col[1], col[2], 0.5f);
    
    /* add code to draw region hidden as 'too small' */
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            uiSetRoundBox(UI_CNR_TOP_LEFT | UI_CNR_TOP_RIGHT | UI_RB_ALPHA);
            
            uiDrawBoxShade(GL_POLYGON, (float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f, -0.3f, 0.05f);
            glColor4ub(0, 0, 0, 255);
            uiRoundRect((float)az->x1, 0.3f+(float)az->y1, (float)az->x2, 0.3f+(float)az->y2, 4.0f);
            break;
        case AE_BOTTOM_TO_TOPLEFT:
            uiSetRoundBox(UI_CNR_BOTTOM_RIGHT | UI_CNR_BOTTOM_LEFT | UI_RB_ALPHA);
            
            uiDrawBoxShade(GL_POLYGON, (float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f, -0.3f, 0.05f);
            glColor4ub(0, 0, 0, 255);
            uiRoundRect((float)az->x1, 0.3f+(float)az->y1, (float)az->x2, 0.3f+(float)az->y2, 4.0f);
            break;
        case AE_LEFT_TO_TOPRIGHT:
            uiSetRoundBox(UI_CNR_TOP_LEFT | UI_CNR_BOTTOM_LEFT | UI_RB_ALPHA);
            
            uiDrawBoxShade(GL_POLYGON, (float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f, -0.3f, 0.05f);
            glColor4ub(0, 0, 0, 255);
            uiRoundRect((float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f);
            break;
        case AE_RIGHT_TO_TOPLEFT:
            uiSetRoundBox(UI_CNR_TOP_RIGHT | UI_CNR_BOTTOM_RIGHT | UI_RB_ALPHA);
            
            uiDrawBoxShade(GL_POLYGON, (float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f, -0.3f, 0.05f);
            glColor4ub(0, 0, 0, 255);
            uiRoundRect((float)az->x1, (float)az->y1, (float)az->x2, (float)az->y2, 4.0f);
            break;
    }
    
    glDisable(GL_BLEND);
}

static void region_draw_azone_tria(AZone *az)
{
    extern void ui_draw_anti_tria(float x1, float y1, float x2, float y2, float x3, float y3); /* xxx temp */
    
    glEnable(GL_BLEND);
    //UI_GetThemeColor3fv(TH_HEADER, col);
    glColor4f(0.0f, 0.0f, 0.0f, 0.35f);
    
    /* add code to draw region hidden as 'too small' */
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            ui_draw_anti_tria((float)az->x1, (float)az->y1, (float)az->x2, (float)az->y1, (float)(az->x1+az->x2)/2, (float)az->y2);
            break;
            
        case AE_BOTTOM_TO_TOPLEFT:
            ui_draw_anti_tria((float)az->x1, (float)az->y2, (float)az->x2, (float)az->y2, (float)(az->x1+az->x2)/2, (float)az->y1);
            break;

        case AE_LEFT_TO_TOPRIGHT:
            ui_draw_anti_tria((float)az->x2, (float)az->y1, (float)az->x2, (float)az->y2, (float)az->x1, (float)(az->y1+az->y2)/2);
            break;
            
        case AE_RIGHT_TO_TOPLEFT:
            ui_draw_anti_tria((float)az->x1, (float)az->y1, (float)az->x1, (float)az->y2, (float)az->x2, (float)(az->y1+az->y2)/2);
            break;
            
    }
    
    glDisable(GL_BLEND);
}

/* only exported for WM */
void ED_area_overdraw(bContext *C)
{
    wmWindow *win= CTX_wm_window(C);
    bScreen *screen= CTX_wm_screen(C);
    ScrArea *sa;
    
    /* Draw AZones, in screenspace */
    wmSubWindowSet(win, screen->mainwin);

    glEnable( GL_BLEND );
    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
    
    for(sa= screen->areabase.first; sa; sa= sa->next) {
        AZone *az;
        for(az= sa->actionzones.first; az; az= az->next) {
            if(az->do_draw) {
                if(az->type==AZONE_AREA) {
                    area_draw_azone(az->x1, az->y1, az->x2, az->y2);
                } else if(az->type==AZONE_REGION) {
                    
                    if(az->ar) {
                        /* only display tab or icons when the region is hidden */
                        if (az->ar->flag & (RGN_FLAG_HIDDEN|RGN_FLAG_TOO_SMALL)) {
                            if(G.rt==3)
                                region_draw_azone_icon(az);
                            else if(G.rt==2)
                                region_draw_azone_tria(az);
                            else if(G.rt==1)
                                region_draw_azone_tab(az);
                            else
                                region_draw_azone_tab_plus(az);
                        }
                    }
                }
                
                az->do_draw= 0;
            }
        }
    }   
    glDisable( GL_BLEND );
    
}

/* get scissor rect, checking overlapping regions */
void region_scissor_winrct(ARegion *ar, rcti *winrct)
{
    *winrct= ar->winrct;
    
    if(ELEM(ar->alignment, RGN_OVERLAP_LEFT, RGN_OVERLAP_RIGHT))
        return;

    while(ar->prev) {
        ar= ar->prev;
        
        if(BLI_isect_rcti(winrct, &ar->winrct, NULL)) {
            if(ar->flag & RGN_FLAG_HIDDEN);
            else if(ar->alignment & RGN_SPLIT_PREV);
            else if(ar->alignment==RGN_OVERLAP_LEFT) {
                winrct->xmin= ar->winrct.xmax + 1;
            }
            else if(ar->alignment==RGN_OVERLAP_RIGHT) {
                winrct->xmax= ar->winrct.xmin - 1;
            }
            else break;
        }
    }
}

/* only exported for WM */
/* makes region ready for drawing, sets pixelspace */
void ED_region_set(const bContext *C, ARegion *ar)
{
    wmWindow *win= CTX_wm_window(C);
    ScrArea *sa= CTX_wm_area(C);
    rcti winrct;
    
    /* checks other overlapping regions */
    region_scissor_winrct(ar, &winrct);
    
    ar->drawrct= winrct;
    
    /* note; this sets state, so we can use wmOrtho and friends */
    wmSubWindowScissorSet(win, ar->swinid, &ar->drawrct);
    
    UI_SetTheme(sa?sa->spacetype:0, ar->type?ar->type->regionid:0);
    
    ED_region_pixelspace(ar);
}


/* only exported for WM */
void ED_region_do_draw(bContext *C, ARegion *ar)
{
    wmWindow *win= CTX_wm_window(C);
    ScrArea *sa= CTX_wm_area(C);
    ARegionType *at= ar->type;
    rcti winrct;
    
    /* see BKE_spacedata_draw_locks() */
    if(at->do_lock)
        return;
    
    /* checks other overlapping regions */
    region_scissor_winrct(ar, &winrct);
    
    /* if no partial draw rect set, full rect */
    if(ar->drawrct.xmin == ar->drawrct.xmax)
        ar->drawrct= winrct;
    else {
        /* extra clip for safety */
        ar->drawrct.xmin= MAX2(winrct.xmin, ar->drawrct.xmin);
        ar->drawrct.ymin= MAX2(winrct.ymin, ar->drawrct.ymin);
        ar->drawrct.xmax= MIN2(winrct.xmax, ar->drawrct.xmax);
        ar->drawrct.ymax= MIN2(winrct.ymax, ar->drawrct.ymax);
    }
    
    /* note; this sets state, so we can use wmOrtho and friends */
    wmSubWindowScissorSet(win, ar->swinid, &ar->drawrct);

    ar->do_draw= 0;
    memset(&ar->drawrct, 0, sizeof(ar->drawrct));
    
    UI_SetTheme(sa?sa->spacetype:0, ar->type?ar->type->regionid:0);
    
    /* optional header info instead? */
    if(ar->headerstr) {
        UI_ThemeClearColor(TH_HEADER);
        glClear(GL_COLOR_BUFFER_BIT);
        
        UI_ThemeColor(TH_TEXT);
        BLF_draw_default(20, 8, 0.0f, ar->headerstr, BLF_DRAW_STR_DUMMY_MAX);
    }
    else if(at->draw) {
        at->draw(C, ar);
    }

    /* XXX test: add convention to end regions always in pixel space, for drawing of borders/gestures etc */
    ED_region_pixelspace(ar);

    ED_region_draw_cb_draw(C, ar, REGION_DRAW_POST_PIXEL);
    
    uiFreeInactiveBlocks(C, &ar->uiblocks);

    if(sa)
        region_draw_emboss(ar, &winrct);
}

/* **********************************
   maybe silly, but let's try for now
   to keep these tags protected
   ********************************** */

void ED_region_tag_redraw(ARegion *ar)
{
    if(ar) {
        /* zero region means full region redraw */
        ar->do_draw= RGN_DRAW;
        memset(&ar->drawrct, 0, sizeof(ar->drawrct));
    }
}

void ED_region_tag_redraw_overlay(ARegion *ar)
{
    if(ar)
        ar->do_draw_overlay= RGN_DRAW;
}

void ED_region_tag_redraw_partial(ARegion *ar, rcti *rct)
{
    if(ar) {
        if(!ar->do_draw) {
            /* no redraw set yet, set partial region */
            ar->do_draw= RGN_DRAW_PARTIAL;
            ar->drawrct= *rct;
        }
        else if(ar->drawrct.xmin != ar->drawrct.xmax) {
            /* partial redraw already set, expand region */
            ar->drawrct.xmin= MIN2(ar->drawrct.xmin, rct->xmin);
            ar->drawrct.ymin= MIN2(ar->drawrct.ymin, rct->ymin);
            ar->drawrct.xmax= MAX2(ar->drawrct.xmax, rct->xmax);
            ar->drawrct.ymax= MAX2(ar->drawrct.ymax, rct->ymax);
        }
    }
}

void ED_area_tag_redraw(ScrArea *sa)
{
    ARegion *ar;
    
    if(sa)
        for(ar= sa->regionbase.first; ar; ar= ar->next)
            ED_region_tag_redraw(ar);
}

void ED_area_tag_redraw_regiontype(ScrArea *sa, int regiontype)
{
    ARegion *ar;
    
    if(sa) {
        for(ar= sa->regionbase.first; ar; ar= ar->next) {
            if(ar->regiontype == regiontype) {
                ED_region_tag_redraw(ar);
            }
        }
    }
}

void ED_area_tag_refresh(ScrArea *sa)
{
    if(sa)
        sa->do_refresh= 1;
}

/* *************************************************************** */

/* use NULL to disable it */
void ED_area_headerprint(ScrArea *sa, const char *str)
{
    ARegion *ar;

    /* happens when running transform operators in backround mode */
    if(sa == NULL)
        return;

    for(ar= sa->regionbase.first; ar; ar= ar->next) {
        if(ar->regiontype==RGN_TYPE_HEADER) {
            if(str) {
                if(ar->headerstr==NULL)
                    ar->headerstr= MEM_mallocN(256, "headerprint");
                BLI_strncpy(ar->headerstr, str, 256);
            }
            else if(ar->headerstr) {
                MEM_freeN(ar->headerstr);
                ar->headerstr= NULL;
            }
            ED_region_tag_redraw(ar);
        }
    }
}

/* ************************************************************ */


static void area_azone_initialize(ScrArea *sa) 
{
    AZone *az;
    
    /* reinitalize entirely, regions add azones too */
    BLI_freelistN(&sa->actionzones);
    
    /* set area action zones */
    az= (AZone *)MEM_callocN(sizeof(AZone), "actionzone");
    BLI_addtail(&(sa->actionzones), az);
    az->type= AZONE_AREA;
    az->x1= sa->totrct.xmin - 1;
    az->y1= sa->totrct.ymin - 1;
    az->x2= sa->totrct.xmin + (AZONESPOT-1);
    az->y2= sa->totrct.ymin + (AZONESPOT-1);
    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
    
    az= (AZone *)MEM_callocN(sizeof(AZone), "actionzone");
    BLI_addtail(&(sa->actionzones), az);
    az->type= AZONE_AREA;
    az->x1= sa->totrct.xmax + 1;
    az->y1= sa->totrct.ymax + 1;
    az->x2= sa->totrct.xmax - (AZONESPOT-1);
    az->y2= sa->totrct.ymax - (AZONESPOT-1);
    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
}

#define AZONEPAD_EDGE   4
#define AZONEPAD_ICON   9
static void region_azone_edge(AZone *az, ARegion *ar)
{
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            az->x1= ar->winrct.xmin;
            az->y1= ar->winrct.ymax - AZONEPAD_EDGE;
            az->x2= ar->winrct.xmax;
            az->y2= ar->winrct.ymax;
            break;
        case AE_BOTTOM_TO_TOPLEFT:
            az->x1= ar->winrct.xmin;
            az->y1= ar->winrct.ymin + AZONEPAD_EDGE;
            az->x2= ar->winrct.xmax;
            az->y2= ar->winrct.ymin;
            break;
        case AE_LEFT_TO_TOPRIGHT:
            az->x1= ar->winrct.xmin;
            az->y1= ar->winrct.ymin;
            az->x2= ar->winrct.xmin + AZONEPAD_EDGE;
            az->y2= ar->winrct.ymax;
            break;
        case AE_RIGHT_TO_TOPLEFT:
            az->x1= ar->winrct.xmax;
            az->y1= ar->winrct.ymin;
            az->x2= ar->winrct.xmax - AZONEPAD_EDGE;
            az->y2= ar->winrct.ymax;
            break;
    }

    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
}

static void region_azone_icon(ScrArea *sa, AZone *az, ARegion *ar)
{
    AZone *azt;
    int tot=0;
    
    /* count how many actionzones with along same edge are available.
       This allows for adding more action zones in the future without
       having to worry about correct offset */
    for(azt= sa->actionzones.first; azt; azt= azt->next) {
        if(azt->edge == az->edge) tot++;
    }
    
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            az->x1= ar->winrct.xmax - tot*2*AZONEPAD_ICON;
            az->y1= ar->winrct.ymax + AZONEPAD_ICON;
            az->x2= ar->winrct.xmax - tot*AZONEPAD_ICON;
            az->y2= ar->winrct.ymax + 2*AZONEPAD_ICON;
            break;
        case AE_BOTTOM_TO_TOPLEFT:
            az->x1= ar->winrct.xmin + AZONEPAD_ICON;
            az->y1= ar->winrct.ymin - 2*AZONEPAD_ICON;
            az->x2= ar->winrct.xmin + 2*AZONEPAD_ICON;
            az->y2= ar->winrct.ymin - AZONEPAD_ICON;
            break;
        case AE_LEFT_TO_TOPRIGHT:
            az->x1= ar->winrct.xmin - 2*AZONEPAD_ICON;
            az->y1= ar->winrct.ymax - tot*2*AZONEPAD_ICON;
            az->x2= ar->winrct.xmin - AZONEPAD_ICON;
            az->y2= ar->winrct.ymax - tot*AZONEPAD_ICON;
            break;
        case AE_RIGHT_TO_TOPLEFT:
            az->x1= ar->winrct.xmax + AZONEPAD_ICON;
            az->y1= ar->winrct.ymax - tot*2*AZONEPAD_ICON;
            az->x2= ar->winrct.xmax + 2*AZONEPAD_ICON;
            az->y2= ar->winrct.ymax - tot*AZONEPAD_ICON;
            break;
    }

    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
    
    /* if more azones on 1 spot, set offset */
    for(azt= sa->actionzones.first; azt; azt= azt->next) {
        if(az!=azt) {
            if( ABS(az->x1-azt->x1) < 2 && ABS(az->y1-azt->y1) < 2) {
                if(az->edge==AE_TOP_TO_BOTTOMRIGHT || az->edge==AE_BOTTOM_TO_TOPLEFT) {
                    az->x1+= AZONESPOT;
                    az->x2+= AZONESPOT;
                }
                else{
                    az->y1-= AZONESPOT;
                    az->y2-= AZONESPOT;
                }
                BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
            }
        }
    }
}

#define AZONEPAD_TAB_PLUSW  14
#define AZONEPAD_TAB_PLUSH  14

/* region already made zero sized, in shape of edge */
static void region_azone_tab_plus(ScrArea *sa, AZone *az, ARegion *ar)
{
    AZone *azt;
    int tot= 0, add;
    
    for(azt= sa->actionzones.first; azt; azt= azt->next) {
        if(azt->edge == az->edge) tot++;
    }
    
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            if(ar->winrct.ymax == sa->totrct.ymin) add= 1; else add= 0;
            az->x1= ar->winrct.xmax - 2.5*AZONEPAD_TAB_PLUSW;
            az->y1= ar->winrct.ymax - add;
            az->x2= ar->winrct.xmax - 1.5*AZONEPAD_TAB_PLUSW;
            az->y2= ar->winrct.ymax - add + AZONEPAD_TAB_PLUSH;
            break;
        case AE_BOTTOM_TO_TOPLEFT:
            az->x1= ar->winrct.xmax - 2.5*AZONEPAD_TAB_PLUSW;
            az->y1= ar->winrct.ymin - AZONEPAD_TAB_PLUSH;
            az->x2= ar->winrct.xmax - 1.5*AZONEPAD_TAB_PLUSW;
            az->y2= ar->winrct.ymin;
            break;
        case AE_LEFT_TO_TOPRIGHT:
            az->x1= ar->winrct.xmin - AZONEPAD_TAB_PLUSH;
            az->y1= ar->winrct.ymax - 2.5*AZONEPAD_TAB_PLUSW;
            az->x2= ar->winrct.xmin;
            az->y2= ar->winrct.ymax - 1.5*AZONEPAD_TAB_PLUSW;
            break;
        case AE_RIGHT_TO_TOPLEFT:
            az->x1= ar->winrct.xmax - 1;
            az->y1= ar->winrct.ymax - 2.5*AZONEPAD_TAB_PLUSW;
            az->x2= ar->winrct.xmax - 1 + AZONEPAD_TAB_PLUSH;
            az->y2= ar->winrct.ymax - 1.5*AZONEPAD_TAB_PLUSW;
            break;
    }
    /* rect needed for mouse pointer test */
    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
}   


#define AZONEPAD_TABW   18
#define AZONEPAD_TABH   7

/* region already made zero sized, in shape of edge */
static void region_azone_tab(ScrArea *sa, AZone *az, ARegion *ar)
{
    AZone *azt;
    int tot= 0, add;
    
    for(azt= sa->actionzones.first; azt; azt= azt->next) {
        if(azt->edge == az->edge) tot++;
    }
    
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            if(ar->winrct.ymax == sa->totrct.ymin) add= 1; else add= 0;
            az->x1= ar->winrct.xmax - 2*AZONEPAD_TABW;
            az->y1= ar->winrct.ymax - add;
            az->x2= ar->winrct.xmax - AZONEPAD_TABW;
            az->y2= ar->winrct.ymax - add + AZONEPAD_TABH;
            break;
        case AE_BOTTOM_TO_TOPLEFT:
            az->x1= ar->winrct.xmin + AZONEPAD_TABW;
            az->y1= ar->winrct.ymin - AZONEPAD_TABH;
            az->x2= ar->winrct.xmin + 2*AZONEPAD_TABW;
            az->y2= ar->winrct.ymin;
            break;
        case AE_LEFT_TO_TOPRIGHT:
            az->x1= ar->winrct.xmin + 1 - AZONEPAD_TABH;
            az->y1= ar->winrct.ymax - 2*AZONEPAD_TABW;
            az->x2= ar->winrct.xmin + 1;
            az->y2= ar->winrct.ymax - AZONEPAD_TABW;
            break;
        case AE_RIGHT_TO_TOPLEFT:
            az->x1= ar->winrct.xmax - 1;
            az->y1= ar->winrct.ymax - 2*AZONEPAD_TABW;
            az->x2= ar->winrct.xmax - 1 + AZONEPAD_TABH;
            az->y2= ar->winrct.ymax - AZONEPAD_TABW;
            break;
    }
    /* rect needed for mouse pointer test */
    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
}   

#define AZONEPAD_TRIAW  16
#define AZONEPAD_TRIAH  9


/* region already made zero sized, in shape of edge */
static void region_azone_tria(ScrArea *sa, AZone *az, ARegion *ar)
{
    AZone *azt;
    int tot= 0, add;
    
    for(azt= sa->actionzones.first; azt; azt= azt->next) {
        if(azt->edge == az->edge) tot++;
    }
    
    switch(az->edge) {
        case AE_TOP_TO_BOTTOMRIGHT:
            if(ar->winrct.ymax == sa->totrct.ymin) add= 1; else add= 0;
            az->x1= ar->winrct.xmax - 2*AZONEPAD_TRIAW;
            az->y1= ar->winrct.ymax - add;
            az->x2= ar->winrct.xmax - AZONEPAD_TRIAW;
            az->y2= ar->winrct.ymax - add + AZONEPAD_TRIAH;
            break;
            case AE_BOTTOM_TO_TOPLEFT:
            az->x1= ar->winrct.xmin + AZONEPAD_TRIAW;
            az->y1= ar->winrct.ymin - AZONEPAD_TRIAH;
            az->x2= ar->winrct.xmin + 2*AZONEPAD_TRIAW;
            az->y2= ar->winrct.ymin;
            break;
            case AE_LEFT_TO_TOPRIGHT:
            az->x1= ar->winrct.xmin + 1 - AZONEPAD_TRIAH;
            az->y1= ar->winrct.ymax - 2*AZONEPAD_TRIAW;
            az->x2= ar->winrct.xmin + 1;
            az->y2= ar->winrct.ymax - AZONEPAD_TRIAW;
            break;
            case AE_RIGHT_TO_TOPLEFT:
            az->x1= ar->winrct.xmax - 1;
            az->y1= ar->winrct.ymax - 2*AZONEPAD_TRIAW;
            az->x2= ar->winrct.xmax - 1 + AZONEPAD_TRIAH;
            az->y2= ar->winrct.ymax - AZONEPAD_TRIAW;
            break;
    }
    /* rect needed for mouse pointer test */
    BLI_init_rcti(&az->rect, az->x1, az->x2, az->y1, az->y2);
}   


static void region_azone_initialize(ScrArea *sa, ARegion *ar, AZEdge edge) 
{
    AZone *az;
    
    az= (AZone *)MEM_callocN(sizeof(AZone), "actionzone");
    BLI_addtail(&(sa->actionzones), az);
    az->type= AZONE_REGION;
    az->ar= ar;
    az->edge= edge;
    
    if (ar->flag & (RGN_FLAG_HIDDEN|RGN_FLAG_TOO_SMALL)) {
        if(G.rt==3)
            region_azone_icon(sa, az, ar);
        else if(G.rt==2)
            region_azone_tria(sa, az, ar);
        else if(G.rt==1)
            region_azone_tab(sa, az, ar);
        else
            region_azone_tab_plus(sa, az, ar);
    } else {
        region_azone_edge(az, ar);
    }
    
}


/* *************************************************************** */

static void region_azone_add(ScrArea *sa, ARegion *ar, int alignment)
{
     /* edge code (t b l r) is along which area edge azone will be drawn */
    
    if(alignment==RGN_ALIGN_TOP)
        region_azone_initialize(sa, ar, AE_BOTTOM_TO_TOPLEFT);
    else if(alignment==RGN_ALIGN_BOTTOM)
        region_azone_initialize(sa, ar, AE_TOP_TO_BOTTOMRIGHT);
    else if(ELEM(alignment, RGN_ALIGN_RIGHT, RGN_OVERLAP_RIGHT))
        region_azone_initialize(sa, ar, AE_LEFT_TO_TOPRIGHT);
    else if(ELEM(alignment, RGN_ALIGN_LEFT, RGN_OVERLAP_LEFT))
        region_azone_initialize(sa, ar, AE_RIGHT_TO_TOPLEFT);
}

/* dir is direction to check, not the splitting edge direction! */
static int rct_fits(rcti *rect, char dir, int size)
{
    if(dir=='h') {
        return rect->xmax-rect->xmin - size;
    }
    else { // 'v'
        return rect->ymax-rect->ymin - size;
    }
}

static void region_rect_recursive(ScrArea *sa, ARegion *ar, rcti *remainder, int quad)
{
    rcti *remainder_prev= remainder;
    int prefsizex, prefsizey;
    int alignment;
    
    if(ar==NULL)
        return;
    
    /* no returns in function, winrct gets set in the end again */
    BLI_init_rcti(&ar->winrct, 0, 0, 0, 0);
    
    /* for test; allow split of previously defined region */
    if(ar->alignment & RGN_SPLIT_PREV)
        if(ar->prev)
            remainder= &ar->prev->winrct;
    
    alignment = ar->alignment & ~RGN_SPLIT_PREV;
    
    /* clear state flags first */
    ar->flag &= ~RGN_FLAG_TOO_SMALL;
    /* user errors */
    if(ar->next==NULL && alignment!=RGN_ALIGN_QSPLIT)
        alignment= RGN_ALIGN_NONE;
    
    /* prefsize, for header we stick to exception */
    prefsizex= ar->sizex?ar->sizex:ar->type->prefsizex;
    if(ar->regiontype==RGN_TYPE_HEADER)
        prefsizey= ar->type->prefsizey;
    else if(ar->regiontype==RGN_TYPE_UI && sa->spacetype == SPACE_FILE) {
        prefsizey= UI_UNIT_Y * 2 + (UI_UNIT_Y/2);
    }
    else
        prefsizey= ar->sizey?ar->sizey:ar->type->prefsizey;
    
    /* hidden is user flag */
    if(ar->flag & RGN_FLAG_HIDDEN);
    /* XXX floating area region, not handled yet here */
    else if(alignment == RGN_ALIGN_FLOAT);
    /* remainder is too small for any usage */
    else if( rct_fits(remainder, 'v', 1)<0 || rct_fits(remainder, 'h', 1) < 0 ) {
        ar->flag |= RGN_FLAG_TOO_SMALL;
    }
    else if(alignment==RGN_ALIGN_NONE) {
        /* typically last region */
        ar->winrct= *remainder;
        BLI_init_rcti(remainder, 0, 0, 0, 0);
    }
    else if(alignment==RGN_ALIGN_TOP || alignment==RGN_ALIGN_BOTTOM) {
        
        if( rct_fits(remainder, 'v', prefsizey) < 0 ) {
            ar->flag |= RGN_FLAG_TOO_SMALL;
        }
        else {
            int fac= rct_fits(remainder, 'v', prefsizey);

            if(fac < 0 )
                prefsizey += fac;
            
            ar->winrct= *remainder;
            
            if(alignment==RGN_ALIGN_TOP) {
                ar->winrct.ymin= ar->winrct.ymax - prefsizey + 1;
                remainder->ymax= ar->winrct.ymin - 1;
            }
            else {
                ar->winrct.ymax= ar->winrct.ymin + prefsizey - 1;
                remainder->ymin= ar->winrct.ymax + 1;
            }
        }
    }
    else if( ELEM4(alignment, RGN_ALIGN_LEFT, RGN_ALIGN_RIGHT, RGN_OVERLAP_LEFT, RGN_OVERLAP_RIGHT)) {
        
        if( rct_fits(remainder, 'h', prefsizex) < 0 ) {
            ar->flag |= RGN_FLAG_TOO_SMALL;
        }
        else {
            int fac= rct_fits(remainder, 'h', prefsizex);
            
            if(fac < 0 )
                prefsizex += fac;
            
            ar->winrct= *remainder;
            
            if(ELEM(alignment, RGN_ALIGN_RIGHT, RGN_OVERLAP_RIGHT)) {
                ar->winrct.xmin= ar->winrct.xmax - prefsizex + 1;
                if(alignment==RGN_ALIGN_RIGHT)
                    remainder->xmax= ar->winrct.xmin - 1;
            }
            else {
                ar->winrct.xmax= ar->winrct.xmin + prefsizex - 1;
                if(alignment==RGN_ALIGN_LEFT)
                    remainder->xmin= ar->winrct.xmax + 1;
            }
        }
    }
    else if(alignment==RGN_ALIGN_VSPLIT || alignment==RGN_ALIGN_HSPLIT) {
        /* percentage subdiv*/
        ar->winrct= *remainder;
        
        if(alignment==RGN_ALIGN_HSPLIT) {
            if( rct_fits(remainder, 'h', prefsizex) > 4) {
                ar->winrct.xmax= (remainder->xmin+remainder->xmax)/2;
                remainder->xmin= ar->winrct.xmax+1;
            }
            else {
                BLI_init_rcti(remainder, 0, 0, 0, 0);
            }
        }
        else {
            if( rct_fits(remainder, 'v', prefsizey) > 4) {
                ar->winrct.ymax= (remainder->ymin+remainder->ymax)/2;
                remainder->ymin= ar->winrct.ymax+1;
            }
            else {
                BLI_init_rcti(remainder, 0, 0, 0, 0);
            }
        }
    }
    else if(alignment==RGN_ALIGN_QSPLIT) {
        ar->winrct= *remainder;
        
        /* test if there's still 4 regions left */
        if(quad==0) {
            ARegion *artest= ar->next;
            int count= 1;
            
            while(artest) {
                artest->alignment= RGN_ALIGN_QSPLIT;
                artest= artest->next;
                count++;
            }
            
            if(count!=4) {
                /* let's stop adding regions */
                BLI_init_rcti(remainder, 0, 0, 0, 0);
                if (G.f & G_DEBUG)
                    printf("region quadsplit failed\n");
            }
            else quad= 1;
        }
        if(quad) {
            if(quad==1) { /* left bottom */
                ar->winrct.xmax = (remainder->xmin + remainder->xmax)/2;
                ar->winrct.ymax = (remainder->ymin + remainder->ymax)/2;
            }
            else if(quad==2) { /* left top */
                ar->winrct.xmax = (remainder->xmin + remainder->xmax)/2;
                ar->winrct.ymin = 1 + (remainder->ymin + remainder->ymax)/2;
            }
            else if(quad==3) { /* right bottom */
                ar->winrct.xmin = 1 + (remainder->xmin + remainder->xmax)/2;
                ar->winrct.ymax = (remainder->ymin + remainder->ymax)/2;
            }
            else {  /* right top */
                ar->winrct.xmin = 1 + (remainder->xmin + remainder->xmax)/2;
                ar->winrct.ymin = 1 + (remainder->ymin + remainder->ymax)/2;
                BLI_init_rcti(remainder, 0, 0, 0, 0);
            }

            quad++;
        }
    }
    
    /* for speedup */
    ar->winx= ar->winrct.xmax - ar->winrct.xmin + 1;
    ar->winy= ar->winrct.ymax - ar->winrct.ymin + 1;
    
    /* set winrect for azones */
    if(ar->flag & (RGN_FLAG_HIDDEN|RGN_FLAG_TOO_SMALL)) {
        ar->winrct= *remainder;
        
        if(alignment==RGN_ALIGN_TOP)
            ar->winrct.ymin= ar->winrct.ymax;
        else if(alignment==RGN_ALIGN_BOTTOM)
            ar->winrct.ymax= ar->winrct.ymin;
        else if(ELEM(alignment, RGN_ALIGN_RIGHT, RGN_OVERLAP_RIGHT))
            ar->winrct.xmin= ar->winrct.xmax;
        else if(ELEM(alignment, RGN_ALIGN_LEFT, RGN_OVERLAP_LEFT))
            ar->winrct.xmax= ar->winrct.xmin;
        else /* prevent winrct to be valid */
            ar->winrct.xmax= ar->winrct.xmin;
    }

    /* restore prev-split exception */
    if(ar->alignment & RGN_SPLIT_PREV) {
        if(ar->prev) {
            remainder= remainder_prev;
            ar->prev->winx= ar->prev->winrct.xmax - ar->prev->winrct.xmin + 1;
            ar->prev->winy= ar->prev->winrct.ymax - ar->prev->winrct.ymin + 1;
        }
    }
    
    /* in end, add azones, where appropriate */
    if(ar->regiontype == RGN_TYPE_HEADER && ar->winy + 6 > sa->winy) {
        /* The logic for this is: when the header takes up the full area,
         * disallow hiding it to view the main window.
         *
         * Without this, you can drag down the file selectors header and hide it
         * by accident very easily (highly annoying!), the value 6 is arbitrary
         * but accounts for small common rounding problems when scaling the UI,
         * must be minimum '4' */
    }
    else {
        region_azone_add(sa, ar, alignment);
    }

    region_rect_recursive(sa, ar->next, remainder, quad);
}

static void area_calc_totrct(ScrArea *sa, int sizex, int sizey)
{
    short rt= 0; // CLAMPIS(G.rt, 0, 16);

    if(sa->v1->vec.x>0) sa->totrct.xmin= sa->v1->vec.x+1+rt;
    else sa->totrct.xmin= sa->v1->vec.x;
    if(sa->v4->vec.x<sizex-1) sa->totrct.xmax= sa->v4->vec.x-1-rt;
    else sa->totrct.xmax= sa->v4->vec.x;
    
    if(sa->v1->vec.y>0) sa->totrct.ymin= sa->v1->vec.y+1+rt;
    else sa->totrct.ymin= sa->v1->vec.y;
    if(sa->v2->vec.y<sizey-1) sa->totrct.ymax= sa->v2->vec.y-1-rt;
    else sa->totrct.ymax= sa->v2->vec.y;
    
    /* for speedup */
    sa->winx= sa->totrct.xmax-sa->totrct.xmin+1;
    sa->winy= sa->totrct.ymax-sa->totrct.ymin+1;
}


/* used for area initialize below */
static void region_subwindow(wmWindow *win, ARegion *ar)
{
    if(ar->flag & (RGN_FLAG_HIDDEN|RGN_FLAG_TOO_SMALL)) {
        if(ar->swinid)
            wm_subwindow_close(win, ar->swinid);
        ar->swinid= 0;
    }
    else if(ar->swinid==0)
        ar->swinid= wm_subwindow_open(win, &ar->winrct);
    else 
        wm_subwindow_position(win, ar->swinid, &ar->winrct);
}

static void ed_default_handlers(wmWindowManager *wm, ScrArea *sa, ListBase *handlers, int flag)
{
    /* note, add-handler checks if it already exists */
    
    // XXX it would be good to have boundbox checks for some of these...
    if(flag & ED_KEYMAP_UI) {
        /* user interface widgets */
        UI_add_region_handlers(handlers);
    }
    if(flag & ED_KEYMAP_VIEW2D) {
        /* 2d-viewport handling+manipulation */
        wmKeyMap *keymap= WM_keymap_find(wm->defaultconf, "View2D", 0, 0);
        WM_event_add_keymap_handler(handlers, keymap);
    }
    if(flag & ED_KEYMAP_MARKERS) {
        /* time-markers */
        wmKeyMap *keymap= WM_keymap_find(wm->defaultconf, "Markers", 0, 0);
        
        /* time space only has this keymap, the others get a boundbox restricted map */
        if(sa->spacetype!=SPACE_TIME) {
            ARegion *ar;
            static rcti rect= {0, 10000, 0, 30};    /* same local check for all areas */
            ar= BKE_area_find_region_type(sa, RGN_TYPE_WINDOW);
            if(ar) {
                WM_event_add_keymap_handler_bb(handlers, keymap, &rect, &ar->winrct);
            }
        }
        else
            WM_event_add_keymap_handler(handlers, keymap);
    }
    if(flag & ED_KEYMAP_ANIMATION) {
        /* frame changing and timeline operators (for time spaces) */
        wmKeyMap *keymap= WM_keymap_find(wm->defaultconf, "Animation", 0, 0);
        WM_event_add_keymap_handler(handlers, keymap);
    }
    if(flag & ED_KEYMAP_FRAMES) {
        /* frame changing/jumping (for all spaces) */
        wmKeyMap *keymap= WM_keymap_find(wm->defaultconf, "Frames", 0, 0);
        WM_event_add_keymap_handler(handlers, keymap);
    }
    if(flag & ED_KEYMAP_GPENCIL) {
        /* grease pencil */
        wmKeyMap *keymap= WM_keymap_find(wm->defaultconf, "Grease Pencil", 0, 0);
        WM_event_add_keymap_handler(handlers, keymap);
    }
    if(flag & ED_KEYMAP_HEADER) {
        /* standard keymap for headers regions */
        wmKeyMap *keymap= WM_keymap_find(wm->defaultconf, "Header", 0, 0);
        WM_event_add_keymap_handler(handlers, keymap);
    }
}


/* called in screen_refresh, or screens_init, also area size changes */
void ED_area_initialize(wmWindowManager *wm, wmWindow *win, ScrArea *sa)
{
    ARegion *ar;
    rcti rect;
    
    /* set typedefinitions */
    sa->type= BKE_spacetype_from_id(sa->spacetype);
    
    if(sa->type==NULL) {
        sa->butspacetype= sa->spacetype= SPACE_VIEW3D;
        sa->type= BKE_spacetype_from_id(sa->spacetype);
    }
    
    for(ar= sa->regionbase.first; ar; ar= ar->next)
        ar->type= BKE_regiontype_from_id(sa->type, ar->regiontype);
    
    /* area sizes */
    area_calc_totrct(sa, win->sizex, win->sizey);
    
    /* clear all azones, add the area triange widgets */
    area_azone_initialize(sa);

    /* region rect sizes */
    rect= sa->totrct;
    region_rect_recursive(sa, sa->regionbase.first, &rect, 0);
    
    /* default area handlers */
    ed_default_handlers(wm, sa, &sa->handlers, sa->type->keymapflag);
    /* checks spacedata, adds own handlers */
    if(sa->type->init)
        sa->type->init(wm, sa);
    
    /* region windows, default and own handlers */
    for(ar= sa->regionbase.first; ar; ar= ar->next) {
        region_subwindow(win, ar);
        
        if(ar->swinid) {
            /* default region handlers */
            ed_default_handlers(wm, sa, &ar->handlers, ar->type->keymapflag);
            /* own handlers */
            if(ar->type->init)
                ar->type->init(wm, ar);
        }
        else {
            /* prevent uiblocks to run */
            uiFreeBlocks(NULL, &ar->uiblocks);  
        }
        
        /* rechecks 2d matrix for header on dpi changing, do not do for other regions, it resets view && blocks view2d operator polls (ton) */
        if(ar->regiontype==RGN_TYPE_HEADER)
            ar->v2d.flag &= ~V2D_IS_INITIALISED;
    }
}

/* externally called for floating regions like menus */
void ED_region_init(bContext *C, ARegion *ar)
{
//  ARegionType *at= ar->type;
    
    /* refresh can be called before window opened */
    region_subwindow(CTX_wm_window(C), ar);
    
    ar->winx= ar->winrct.xmax - ar->winrct.xmin + 1;
    ar->winy= ar->winrct.ymax - ar->winrct.ymin + 1;
    
    /* UI convention */
    wmOrtho2(-0.01f, ar->winx-0.01f, -0.01f, ar->winy-0.01f);
    glLoadIdentity();
}

void ED_region_toggle_hidden(bContext *C, ARegion *ar)
{
    ScrArea *sa= CTX_wm_area(C);

    ar->flag ^= RGN_FLAG_HIDDEN;

    if(ar->flag & RGN_FLAG_HIDDEN)
        WM_event_remove_handlers(C, &ar->handlers);

    ED_area_initialize(CTX_wm_manager(C), CTX_wm_window(C), sa);
    ED_area_tag_redraw(sa);
}

/* sa2 to sa1, we swap spaces for fullscreen to keep all allocated data */
/* area vertices were set */
void area_copy_data(ScrArea *sa1, ScrArea *sa2, int swap_space)
{
    SpaceType *st;
    ARegion *ar;
    int spacetype= sa1->spacetype;
    
    sa1->headertype= sa2->headertype;
    sa1->spacetype= sa2->spacetype;
    sa1->butspacetype= sa2->butspacetype;
    
    if(swap_space == 1) {
        SWAP(ListBase, sa1->spacedata, sa2->spacedata);
        /* exception: ensure preview is reset */
//      if(sa1->spacetype==SPACE_VIEW3D)
// XXX          BIF_view3d_previewrender_free(sa1->spacedata.first);
    }
    else if (swap_space == 2) {
        BKE_spacedata_copylist(&sa1->spacedata, &sa2->spacedata);
    }
    else {
        BKE_spacedata_freelist(&sa1->spacedata);
        BKE_spacedata_copylist(&sa1->spacedata, &sa2->spacedata);
    }
    
    /* Note; SPACE_EMPTY is possible on new screens */
    
    /* regions */
    if(swap_space == 1) {
        SWAP(ListBase, sa1->regionbase, sa2->regionbase);
    }
    else {
        if(swap_space<2) {
            st= BKE_spacetype_from_id(spacetype);
            for(ar= sa1->regionbase.first; ar; ar= ar->next)
                BKE_area_region_free(st, ar);
            BLI_freelistN(&sa1->regionbase);
        }
        
        st= BKE_spacetype_from_id(sa2->spacetype);
        for(ar= sa2->regionbase.first; ar; ar= ar->next) {
            ARegion *newar= BKE_area_region_copy(st, ar);
            BLI_addtail(&sa1->regionbase, newar);
        }
    }
}

/* *********** Space switching code *********** */

void ED_area_swapspace(bContext *C, ScrArea *sa1, ScrArea *sa2)
{
    ScrArea *tmp= MEM_callocN(sizeof(ScrArea), "addscrarea");

    ED_area_exit(C, sa1);
    ED_area_exit(C, sa2);

    area_copy_data(tmp, sa1, 2);
    area_copy_data(sa1, sa2, 0);
    area_copy_data(sa2, tmp, 0);
    ED_area_initialize(CTX_wm_manager(C), CTX_wm_window(C), sa1);
    ED_area_initialize(CTX_wm_manager(C), CTX_wm_window(C), sa2);

    BKE_screen_area_free(tmp);
    MEM_freeN(tmp);

    /* tell WM to refresh, cursor types etc */
    WM_event_add_mousemove(C);
    
    ED_area_tag_redraw(sa1);
    ED_area_tag_refresh(sa1);
    ED_area_tag_redraw(sa2);
    ED_area_tag_refresh(sa2);
}

void ED_area_newspace(bContext *C, ScrArea *sa, int type)
{
    if(sa->spacetype != type) {
        SpaceType *st;
        SpaceLink *slold;
        SpaceLink *sl;

        ED_area_exit(C, sa);

        st= BKE_spacetype_from_id(type);
        slold= sa->spacedata.first;

        sa->spacetype= type;
        sa->butspacetype= type;
        sa->type= st;
        
        /* check previously stored space */
        for (sl= sa->spacedata.first; sl; sl= sl->next)
            if(sl->spacetype==type)
                break;
        
        /* old spacedata... happened during work on 2.50, remove */
        if(sl && sl->regionbase.first==NULL) {
            st->free(sl);
            BLI_freelinkN(&sa->spacedata, sl);
            if(slold == sl) {
                slold= NULL;
            }
            sl= NULL;
        }
        
        if (sl) {
            
            /* swap regions */
            slold->regionbase= sa->regionbase;
            sa->regionbase= sl->regionbase;
            sl->regionbase.first= sl->regionbase.last= NULL;
            
            /* put in front of list */
            BLI_remlink(&sa->spacedata, sl);
            BLI_addhead(&sa->spacedata, sl);
        } 
        else {
            /* new space */
            if(st) {
                sl= st->new(C);
                BLI_addhead(&sa->spacedata, sl);
                
                /* swap regions */
                if(slold)
                    slold->regionbase= sa->regionbase;
                sa->regionbase= sl->regionbase;
                sl->regionbase.first= sl->regionbase.last= NULL;
            }
        }
        
        ED_area_initialize(CTX_wm_manager(C), CTX_wm_window(C), sa);
        
        /* tell WM to refresh, cursor types etc */
        WM_event_add_mousemove(C);
                
        /*send space change notifier*/
        WM_event_add_notifier(C, NC_SPACE|ND_SPACE_CHANGED, sa);
        
        ED_area_tag_refresh(sa);
    }
    
    /* also redraw when re-used */
    ED_area_tag_redraw(sa);
}

void ED_area_prevspace(bContext *C, ScrArea *sa)
{
    SpaceLink *sl = (sa) ? sa->spacedata.first : CTX_wm_space_data(C);

    if(sl->next) {
        /* workaround for case of double prevspace, render window
           with a file browser on top of it */
        if(sl->next->spacetype == SPACE_FILE && sl->next->next)
            ED_area_newspace(C, sa, sl->next->next->spacetype);
        else
            ED_area_newspace(C, sa, sl->next->spacetype);
    }
    else {
        ED_area_newspace(C, sa, SPACE_INFO);
    }
    ED_area_tag_redraw(sa);

    /*send space change notifier*/
    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_CHANGED, sa);
}

static const char *editortype_pup(void)
{
    const char *types= N_(
           "Editor type:%t"
           "|3D View %x1"

           "|%l"
           
           "|Timeline %x15"
           "|Graph Editor %x2"
           "|DopeSheet %x12"
           "|NLA Editor %x13"
           
           "|%l"
           
           "|UV/Image Editor %x6"
           
           "|Video Sequence Editor %x8"
           "|Movie Clip Editor %x20"
           "|Text Editor %x9" 
           "|Node Editor %x16"
           "|Logic Editor %x17"
           
           "|%l"
           
           "|Properties %x4"
           "|Outliner %x3"
           "|User Preferences %x19"
           "|Info%x7"

           "|%l"

           "|File Browser %x5"
           
           "|%l"
           
           "|Python Console %x18"
           );

    return IFACE_(types);
}

static void spacefunc(struct bContext *C, void *UNUSED(arg1), void *UNUSED(arg2))
{
    ED_area_newspace(C, CTX_wm_area(C), CTX_wm_area(C)->butspacetype);
    ED_area_tag_redraw(CTX_wm_area(C));

    /*send space change notifier*/
    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_CHANGED, CTX_wm_area(C));
}

/* returns offset for next button in header */
int ED_area_header_switchbutton(const bContext *C, uiBlock *block, int yco)
{
    ScrArea *sa= CTX_wm_area(C);
    uiBut *but;
    int xco= 8;
    
    but= uiDefIconTextButC(block, ICONTEXTROW, 0, ICON_VIEW3D, 
                           editortype_pup(), xco, yco, UI_UNIT_X+10, UI_UNIT_Y, 
                           &(sa->butspacetype), 1.0, SPACEICONMAX, 0, 0, 
                           TIP_("Displays current editor type. Click for menu of available types"));
    uiButSetFunc(but, spacefunc, NULL, NULL);
    uiButClearFlag(but, UI_BUT_UNDO); /* skip undo on screen buttons */
    
    return xco + UI_UNIT_X + 14;
}

int ED_area_header_standardbuttons(const bContext *C, uiBlock *block, int yco)
{
    ScrArea *sa= CTX_wm_area(C);
    int xco= 8;
    uiBut *but;
    
    if (!sa->full)
        xco= ED_area_header_switchbutton(C, block, yco);

    uiBlockSetEmboss(block, UI_EMBOSSN);

    if (sa->flag & HEADER_NO_PULLDOWN) {
        but= uiDefIconButBitS(block, TOG, HEADER_NO_PULLDOWN, 0,
                         ICON_DISCLOSURE_TRI_RIGHT,
                         xco,yco,UI_UNIT_X,UI_UNIT_Y-2,
                         &(sa->flag), 0, 0, 0, 0, 
                         "Show pulldown menus");
    }
    else {
        but= uiDefIconButBitS(block, TOG, HEADER_NO_PULLDOWN, 0,
                         ICON_DISCLOSURE_TRI_DOWN,
                         xco,yco,UI_UNIT_X,UI_UNIT_Y-2,
                         &(sa->flag), 0, 0, 0, 0, 
                         "Hide pulldown menus");
    }

    uiButClearFlag(but, UI_BUT_UNDO); /* skip undo on screen buttons */

    uiBlockSetEmboss(block, UI_EMBOSS);
    
    return xco + UI_UNIT_X;
}

/************************ standard UI regions ************************/

void ED_region_panels(const bContext *C, ARegion *ar, int vertical, const char *context, int contextnr)
{
    ScrArea *sa= CTX_wm_area(C);
    uiStyle *style= UI_GetStyle();
    uiBlock *block;
    PanelType *pt;
    Panel *panel;
    View2D *v2d= &ar->v2d;
    View2DScrollers *scrollers;
    int x, y, xco, yco, w, em, triangle, open, newcontext= 0;

    if(contextnr >= 0)
        newcontext= UI_view2d_tab_set(v2d, contextnr);

    if(vertical) {
        w= v2d->cur.xmax - v2d->cur.xmin;
        em= (ar->type->prefsizex)? UI_UNIT_Y/2: UI_UNIT_Y;
    }
    else {
        w= UI_PANEL_WIDTH;
        em= (ar->type->prefsizex)? UI_UNIT_Y/2: UI_UNIT_Y;
    }

    /* create panels */
    uiBeginPanels(C, ar);

    /* set view2d view matrix for scrolling (without scrollers) */
    UI_view2d_view_ortho(v2d);

    for(pt= ar->type->paneltypes.first; pt; pt= pt->next) {
        /* verify context */
        if(context)
            if(pt->context[0] && strcmp(context, pt->context) != 0)
                continue;

        /* draw panel */
        if(pt->draw && (!pt->poll || pt->poll(C, pt))) {
            block= uiBeginBlock(C, ar, pt->idname, UI_EMBOSS);
            panel= uiBeginPanel(sa, ar, block, pt, &open);

            /* bad fixed values */
            triangle= (int)(UI_UNIT_Y * 1.1f);

            if(pt->draw_header && !(pt->flag & PNL_NO_HEADER) && (open || vertical)) {
                /* for enabled buttons */
                panel->layout= uiBlockLayout(block, UI_LAYOUT_HORIZONTAL, UI_LAYOUT_HEADER,
                    triangle, UI_UNIT_Y+style->panelspace+2, UI_UNIT_Y, 1, style);

                pt->draw_header(C, panel);

                uiBlockLayoutResolve(block, &xco, &yco);
                panel->labelofs= xco - triangle;
                panel->layout= NULL;
            }
            else {
                panel->labelofs= 0;
            }

            if(open) {
                short panelContext;
                
                /* panel context can either be toolbar region or normal panels region */
                if (ar->regiontype == RGN_TYPE_TOOLS)
                    panelContext= UI_LAYOUT_TOOLBAR;
                else
                    panelContext= UI_LAYOUT_PANEL;
                
                panel->layout= uiBlockLayout(block, UI_LAYOUT_VERTICAL, panelContext,
                    style->panelspace, 0, w-2*style->panelspace, em, style);

                pt->draw(C, panel);

                uiBlockLayoutResolve(block, &xco, &yco);
                panel->layout= NULL;

                yco -= 2*style->panelspace;
                uiEndPanel(block, w, -yco);
            }
            else {
                yco= 0;
                uiEndPanel(block, w, 0);
            }

            uiEndBlock(C, block);
        }
    }

    /* align panels and return size */
    uiEndPanels(C, ar, &x, &y);

    /* clear */
    UI_ThemeClearColor((ar->type->regionid == RGN_TYPE_PREVIEW)?TH_PREVIEW_BACK:TH_BACK);
    glClear(GL_COLOR_BUFFER_BIT);
    
    /* before setting the view */
    if(vertical) {
        /* only allow scrolling in vertical direction */
        v2d->keepofs |= V2D_LOCKOFS_X|V2D_KEEPOFS_Y;
        v2d->keepofs &= ~(V2D_LOCKOFS_Y|V2D_KEEPOFS_X);
        v2d->scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
        v2d->scroll &= ~V2D_SCROLL_VERTICAL_HIDE;
        
        // don't jump back when panels close or hide
        if(!newcontext)
            y= MAX2(-y, -v2d->cur.ymin);
        else
            y= -y;
    }
    else {
        /* for now, allow scrolling in both directions (since layouts are optimised for vertical,
         * they often don't fit in horizontal layout)
         */
        v2d->keepofs &= ~(V2D_LOCKOFS_X|V2D_LOCKOFS_Y|V2D_KEEPOFS_X|V2D_KEEPOFS_Y);
        //v2d->keepofs |= V2D_LOCKOFS_Y|V2D_KEEPOFS_X;
        //v2d->keepofs &= ~(V2D_LOCKOFS_X|V2D_KEEPOFS_Y);
        v2d->scroll |= V2D_SCROLL_VERTICAL_HIDE;
        v2d->scroll &= ~V2D_SCROLL_HORIZONTAL_HIDE;
        
        // don't jump back when panels close or hide
        if(!newcontext)
            x= MAX2(x, v2d->cur.xmax);
        y= -y;
    }

    // +V2D_SCROLL_HEIGHT is workaround to set the actual height
    UI_view2d_totRect_set(v2d, x+V2D_SCROLL_WIDTH, y+V2D_SCROLL_HEIGHT);

    /* set the view */
    UI_view2d_view_ortho(v2d);

    /* draw panels */
    uiDrawPanels(C, ar);

    /* restore view matrix */
    UI_view2d_view_restore(C);
    
    /* scrollers */
    scrollers= UI_view2d_scrollers_calc(C, v2d, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY);
    UI_view2d_scrollers_draw(C, v2d, scrollers);
    UI_view2d_scrollers_free(scrollers);
}

void ED_region_panels_init(wmWindowManager *wm, ARegion *ar)
{
    wmKeyMap *keymap;
    
    // XXX quick hacks for files saved with 2.5 already (i.e. the builtin defaults file)
        // scrollbars for button regions
    ar->v2d.scroll |= (V2D_SCROLL_RIGHT|V2D_SCROLL_BOTTOM); 
    ar->v2d.scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
    ar->v2d.scroll &= ~V2D_SCROLL_VERTICAL_HIDE;
    ar->v2d.keepzoom |= V2D_KEEPZOOM;

        // correctly initialised User-Prefs?
    if(!(ar->v2d.align & V2D_ALIGN_NO_POS_Y))
        ar->v2d.flag &= ~V2D_IS_INITIALISED;
    
    UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_PANELS_UI, ar->winx, ar->winy);

    keymap= WM_keymap_find(wm->defaultconf, "View2D Buttons List", 0, 0);
    WM_event_add_keymap_handler(&ar->handlers, keymap);
}

void ED_region_header(const bContext *C, ARegion *ar)
{
    uiStyle *style= UI_GetStyle();
    uiBlock *block;
    uiLayout *layout;
    HeaderType *ht;
    Header header = {NULL};
    int maxco, xco, yco;
    int headery= ED_area_headersize();

    /* clear */ 
    UI_ThemeClearColor((ED_screen_area_active(C))?TH_HEADER:TH_HEADERDESEL);
    glClear(GL_COLOR_BUFFER_BIT);
    
    /* set view2d view matrix for scrolling (without scrollers) */
    UI_view2d_view_ortho(&ar->v2d);

    xco= maxco= 8;
    yco= headery-4;

    /* draw all headers types */
    for(ht= ar->type->headertypes.first; ht; ht= ht->next) {
        block= uiBeginBlock(C, ar, ht->idname, UI_EMBOSS);
        layout= uiBlockLayout(block, UI_LAYOUT_HORIZONTAL, UI_LAYOUT_HEADER, xco, yco, UI_UNIT_Y, 1, style);

        if(ht->draw) {
            header.type= ht;
            header.layout= layout;
            ht->draw(C, &header);
            
            /* for view2d */
            xco= uiLayoutGetWidth(layout);
            if(xco > maxco)
                maxco= xco;
        }

        uiBlockLayoutResolve(block, &xco, &yco);
        
        /* for view2d */
        if(xco > maxco)
            maxco= xco;
        
        uiEndBlock(C, block);
        uiDrawBlock(C, block);
    }

    /* always as last  */
    UI_view2d_totRect_set(&ar->v2d, maxco+UI_UNIT_X+80, ar->v2d.tot.ymax-ar->v2d.tot.ymin);

    /* restore view matrix? */
    UI_view2d_view_restore(C);
}

void ED_region_header_init(ARegion *ar)
{
    UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_HEADER, ar->winx, ar->winy);
}

/* UI_UNIT_Y is defined as U variable now, depending dpi */
int ED_area_headersize(void)
{
    return UI_UNIT_Y+6;
}

void ED_region_info_draw(ARegion *ar, const char *text, int block, float alpha)
{
    const int header_height = 18;
    uiStyle *style= UI_GetStyle();
    int fontid= style->widget.uifont_id;
    rcti rect;

    BLF_size(fontid, 11.0f, 72);

    /* background box */
    rect= ar->winrct;
    rect.xmin= 0;
    rect.ymin= ar->winrct.ymax - ar->winrct.ymin - header_height;

    if(block) {
        rect.xmax= ar->winrct.xmax - ar->winrct.xmin;
    }
    else {
        rect.xmax= rect.xmin + BLF_width(fontid, text) + 24;
    }

    rect.ymax= ar->winrct.ymax - ar->winrct.ymin;

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
    glColor4f(0.0f, 0.0f, 0.0f, alpha);
    glRecti(rect.xmin, rect.ymin, rect.xmax+1, rect.ymax+1);
    glDisable(GL_BLEND);

    /* text */
    UI_ThemeColor(TH_TEXT_HI);
    BLF_position(fontid, 12, rect.ymin + 5, 0.0f);
    BLF_draw(fontid, text, BLF_DRAW_STR_DUMMY_MAX);
}