area.c

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/*
 * $Id: area.c 37986 2011-06-30 15:02:03Z ton $
 *
 * ***** 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 "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, 50);
        sdrawline(rect.xmax, rect.ymin, rect.xmax, rect.ymax);
        
        /* bottom  */
        glColor4ub(0,0,0, 80);
        sdrawline(rect.xmin, rect.ymin, rect.xmax, rect.ymin);
        
        /* top  */
        glColor4ub(255,255,255, 60);
        sdrawline(rect.xmin, rect.ymax, rect.xmax, rect.ymax);

        /* left  */
        glColor4ub(255,255,255, 50);
        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= floor(0.3f*(x2-x1));
        int dy= floor(0.3f*(y2-y1));
        
        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);
}


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 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(3 + 16);
                        
                        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(12 + 16);
                        
                        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(9 + 16);
                        
                        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(6 + 16);
                        
                        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==2)
                                                                region_draw_azone_tria(az);
                                                        else if(G.rt==1)
                                                                region_draw_azone_tab(az);
                                                        else
                                                                region_draw_azone_icon(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);
        
        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, 65535); /* XXX, use real length */
        }
        else if(at->draw) {
                at->draw(C, ar);
        }

        ED_region_draw_cb_draw(C, ar, REGION_DRAW_POST_PIXEL);
        
        uiFreeInactiveBlocks(C, &ar->uiblocks);
        
        if(sa)
                region_draw_emboss(ar, &winrct);
        
        /* XXX test: add convention to end regions always in pixel space, for drawing of borders/gestures etc */
        ED_region_pixelspace(ar);
        
        ar->do_draw= 0;
        memset(&ar->drawrct, 0, sizeof(ar->drawrct));
}

/* **********************************
   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;
        az->y1= sa->totrct.ymin;
        az->x2= sa->totrct.xmin + AZONESPOT;
        az->y2= sa->totrct.ymin + AZONESPOT;
        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;
        az->y2= sa->totrct.ymax-AZONESPOT;
        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_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==2)
                        region_azone_tria(sa, az, ar);
                else if(G.rt==1)
                        region_azone_tab(sa, az, ar);
                else
                        region_azone_icon(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
                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)
{
        return(
                   "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"
                   "|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"
                   );
}

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, 
                                                   "Displays current editor type. "
                                                   "Click for menu of available types");
        uiButSetFunc(but, spacefunc, NULL, NULL);
        
        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;
        
        if (!sa->full)
                xco= ED_area_header_switchbutton(C, block, yco);

        uiBlockSetEmboss(block, UI_EMBOSSN);

        if (sa->flag & HEADER_NO_PULLDOWN) {
                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 {
                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");
        }

        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= U.uistyles.first;
        uiBlock *block;
        PanelType *pt;
        Panel *panel;
        View2D *v2d= &ar->v2d;
        View2DScrollers *scrollers;
        int xco, yco, x, y, miny=0, w, em, header, 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;
        }

        x= 0;
        y= -style->panelouter;

        /* 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 */
                        header= (pt->flag & PNL_NO_HEADER)? 0: UI_UNIT_Y;
                        triangle= (int)(UI_UNIT_Y * 1.1f);

                        if(vertical)
                                y -= header;

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

                        if(vertical) {
                                if(pt->flag & PNL_NO_HEADER)
                                        y += yco;
                                else
                                        y += yco-style->panelouter;
                        }
                        else {
                                x += w;
                                miny= MIN2(y, yco-style->panelouter-header);
                        }
                }
        }

        if(vertical)
                x += w;
        else
                y= miny;
        
        /* in case there are no panels */
        if(x == 0 || y == 0) {
                x= UI_PANEL_WIDTH;
                y= UI_PANEL_WIDTH;
        }

        /* 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);

        /* this does the actual drawing! */
        uiEndPanels(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= U.uistyles.first;
        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;
}