/*
 * ***** 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.
 *
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/screen/screen_ops.c
 *  \ingroup edscr
 */


#include <math.h>
#include <string.h>

#include "MEM_guardedalloc.h"

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

#include "BLF_translation.h"

#include "DNA_armature_types.h"
#include "DNA_lattice_types.h"
#include "DNA_object_types.h"
#include "DNA_curve_types.h"
#include "DNA_scene_types.h"
#include "DNA_meta_types.h"
#include "DNA_mask_types.h"
#include "DNA_node_types.h"
#include "DNA_userdef_types.h"

#include "BKE_context.h"
#include "BKE_customdata.h"
#include "BKE_global.h"
#include "BKE_main.h"
#include "BKE_object.h"
#include "BKE_report.h"
#include "BKE_scene.h"
#include "BKE_screen.h"
#include "BKE_editmesh.h"
#include "BKE_sound.h"
#include "BKE_mask.h"

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

#include "ED_armature.h"
#include "ED_clip.h"
#include "ED_image.h"
#include "ED_keyframes_draw.h"
#include "ED_object.h"
#include "ED_screen.h"
#include "ED_screen_types.h"
#include "ED_sequencer.h"
#include "ED_util.h"
#include "ED_view3d.h"

#include "RNA_access.h"
#include "RNA_define.h"

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

#include "wm_window.h"

#include "screen_intern.h"  /* own module include */

#define KM_MODAL_CANCEL     1
#define KM_MODAL_APPLY      2
#define KM_MODAL_STEP10     3
#define KM_MODAL_STEP10_OFF 4

/* ************** Exported Poll tests ********************** */

int ED_operator_regionactive(bContext *C)
{
	if (CTX_wm_window(C) == NULL) return 0;
	if (CTX_wm_screen(C) == NULL) return 0;
	if (CTX_wm_region(C) == NULL) return 0;
	return 1;
}

int ED_operator_areaactive(bContext *C)
{
	if (CTX_wm_window(C) == NULL) return 0;
	if (CTX_wm_screen(C) == NULL) return 0;
	if (CTX_wm_area(C) == NULL) return 0;
	return 1;
}

int ED_operator_screenactive(bContext *C)
{
	if (CTX_wm_window(C) == NULL) return 0;
	if (CTX_wm_screen(C) == NULL) return 0;
	return 1;
}

/* XXX added this to prevent anim state to change during renders */
static int ED_operator_screenactive_norender(bContext *C)
{
	if (G.is_rendering) return 0;
	if (CTX_wm_window(C) == NULL) return 0;
	if (CTX_wm_screen(C) == NULL) return 0;
	return 1;
}


static int screen_active_editable(bContext *C)
{
	if (ED_operator_screenactive(C)) {
		/* no full window splitting allowed */
		if (CTX_wm_screen(C)->full != SCREENNORMAL)
			return 0;
		return 1;
	}
	return 0;
}

/* when mouse is over area-edge */
int ED_operator_screen_mainwinactive(bContext *C)
{
	bScreen *screen;
	if (CTX_wm_window(C) == NULL) return 0;
	screen = CTX_wm_screen(C);
	if (screen == NULL) return 0;
	if (screen->subwinactive != screen->mainwin) return 0;
	return 1;
}

int ED_operator_scene_editable(bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	if (scene && scene->id.lib == NULL)
		return 1;
	return 0;
}

int ED_operator_objectmode(bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	Object *obact = CTX_data_active_object(C);

	if (scene == NULL || scene->id.lib)
		return 0;
	if (CTX_data_edit_object(C))
		return 0;
	
	/* add a check for ob->mode too? */
	if (obact && (obact->mode != OB_MODE_OBJECT))
		return 0;
	
	return 1;
}


static bool ed_spacetype_test(bContext *C, int type)
{
	if (ED_operator_areaactive(C)) {
		SpaceLink *sl = (SpaceLink *)CTX_wm_space_data(C);
		return sl && (sl->spacetype == type);
	}
	return 0;
}

int ED_operator_view3d_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_VIEW3D);
}

int ED_operator_region_view3d_active(bContext *C)
{
	if (CTX_wm_region_view3d(C))
		return true;

	CTX_wm_operator_poll_msg_set(C, "expected a view3d region");
	return false;
}

/* generic for any view2d which uses anim_ops */
int ED_operator_animview_active(bContext *C)
{
	if (ED_operator_areaactive(C)) {
		SpaceLink *sl = (SpaceLink *)CTX_wm_space_data(C);
		if (sl && (ELEM(sl->spacetype, SPACE_SEQ, SPACE_ACTION, SPACE_NLA, SPACE_IPO, SPACE_TIME)))
			return true;
	}

	CTX_wm_operator_poll_msg_set(C, "expected a timeline/animation area to be active");
	return 0;
}

int ED_operator_timeline_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_TIME);
}

int ED_operator_outliner_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_OUTLINER);
}

int ED_operator_outliner_active_no_editobject(bContext *C)
{
	if (ed_spacetype_test(C, SPACE_OUTLINER)) {
		Object *ob = ED_object_active_context(C);
		Object *obedit = CTX_data_edit_object(C);
		if (ob && ob == obedit)
			return 0;
		else
			return 1;
	}
	return 0;
}

int ED_operator_file_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_FILE);
}

int ED_operator_action_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_ACTION);
}

int ED_operator_buttons_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_BUTS);
}

int ED_operator_node_active(bContext *C)
{
	SpaceNode *snode = CTX_wm_space_node(C);
	
	if (snode && snode->edittree)
		return 1;
	
	return 0;
}

int ED_operator_node_editable(bContext *C)
{
	SpaceNode *snode = CTX_wm_space_node(C);
	
	if (snode && snode->edittree && snode->edittree->id.lib == NULL)
		return 1;
	
	return 0;
}

int ED_operator_graphedit_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_IPO);
}

int ED_operator_sequencer_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_SEQ);
}

int ED_operator_sequencer_active_editable(bContext *C)
{
	return ed_spacetype_test(C, SPACE_SEQ) && ED_operator_scene_editable(C);
}

int ED_operator_image_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_IMAGE);
}

int ED_operator_nla_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_NLA);
}

int ED_operator_logic_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_LOGIC);
}

int ED_operator_info_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_INFO);
}


int ED_operator_console_active(bContext *C)
{
	return ed_spacetype_test(C, SPACE_CONSOLE);
}

static int ed_object_hidden(Object *ob)
{
	/* if hidden but in edit mode, we still display, can happen with animation */
	return ((ob->restrictflag & OB_RESTRICT_VIEW) && !(ob->mode & OB_MODE_EDIT));
}

int ED_operator_object_active(bContext *C)
{
	Object *ob = ED_object_active_context(C);
	return ((ob != NULL) && !ed_object_hidden(ob));
}

int ED_operator_object_active_editable(bContext *C)
{
	Object *ob = ED_object_active_context(C);
	return ((ob != NULL) && !(ob->id.lib) && !ed_object_hidden(ob));
}

int ED_operator_object_active_editable_mesh(bContext *C)
{
	Object *ob = ED_object_active_context(C);
	return ((ob != NULL) && !(ob->id.lib) && !ed_object_hidden(ob) &&
	        (ob->type == OB_MESH) && !(((ID *)ob->data)->lib));
}

int ED_operator_object_active_editable_font(bContext *C)
{
	Object *ob = ED_object_active_context(C);
	return ((ob != NULL) && !(ob->id.lib) && !ed_object_hidden(ob) &&
	        (ob->type == OB_FONT));
}

int ED_operator_editmesh(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_MESH)
		return NULL != BKE_editmesh_from_object(obedit);
	return 0;
}

int ED_operator_editmesh_view3d(bContext *C)
{
	return ED_operator_editmesh(C) && ED_operator_view3d_active(C);
}

int ED_operator_editmesh_region_view3d(bContext *C)
{
	if (ED_operator_editmesh(C) && CTX_wm_region_view3d(C))
		return 1;

	CTX_wm_operator_poll_msg_set(C, "expected a view3d region & editmesh");
	return 0;
}

int ED_operator_editarmature(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_ARMATURE)
		return NULL != ((bArmature *)obedit->data)->edbo;
	return 0;
}

/**
 * \brief check for pose mode (no mixed modes)
 *
 * We want to enable most pose operations in weight paint mode,
 * when it comes to transforming bones, but managing bomes layers/groups
 * can be left for pose mode only. (not weight paint mode)
 */
int ED_operator_posemode_exclusive(bContext *C)
{
	Object *obact = CTX_data_active_object(C);

	if (obact && !(obact->mode & OB_MODE_EDIT)) {
		Object *obpose;
		if ((obpose = BKE_object_pose_armature_get(obact))) {
			if (obact == obpose) {
				return 1;
			}
		}
	}

	return 0;
}

/* allows for pinned pose objects to be used in the object buttons
 * and the the non-active pose object to be used in the 3D view */
int ED_operator_posemode_context(bContext *C)
{
	Object *obpose = ED_pose_object_from_context(C);

	if (obpose && !(obpose->mode & OB_MODE_EDIT)) {
		if (BKE_object_pose_context_check(obpose)) {
			return 1;
		}
	}

	return 0;
}

int ED_operator_posemode(bContext *C)
{
	Object *obact = CTX_data_active_object(C);

	if (obact && !(obact->mode & OB_MODE_EDIT)) {
		Object *obpose;
		if ((obpose = BKE_object_pose_armature_get(obact))) {
			if ((obact == obpose) || (obact->mode & OB_MODE_WEIGHT_PAINT)) {
				return 1;
			}
		}
	}

	return 0;
}

/* wrapper for ED_space_image_show_uvedit */
int ED_operator_uvedit(bContext *C)
{
	SpaceImage *sima = CTX_wm_space_image(C);
	Object *obedit = CTX_data_edit_object(C);
	return ED_space_image_show_uvedit(sima, obedit);
}

int ED_operator_uvedit_space_image(bContext *C)
{
	SpaceImage *sima = CTX_wm_space_image(C);
	Object *obedit = CTX_data_edit_object(C);
	return sima && ED_space_image_show_uvedit(sima, obedit);
}

int ED_operator_uvmap(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	BMEditMesh *em = NULL;
	
	if (obedit && obedit->type == OB_MESH) {
		em = BKE_editmesh_from_object(obedit);
	}
	
	if (em && (em->bm->totface)) {
		return true;
	}
	
	return false;
}

int ED_operator_editsurfcurve(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && ELEM(obedit->type, OB_CURVE, OB_SURF))
		return NULL != ((Curve *)obedit->data)->editnurb;
	return 0;
}

int ED_operator_editsurfcurve_region_view3d(bContext *C)
{
	if (ED_operator_editsurfcurve(C) && CTX_wm_region_view3d(C))
		return 1;

	CTX_wm_operator_poll_msg_set(C, "expected a view3d region & editcurve");
	return 0;
}

int ED_operator_editcurve(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_CURVE)
		return NULL != ((Curve *)obedit->data)->editnurb;
	return 0;
}

int ED_operator_editcurve_3d(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_CURVE) {
		Curve *cu = (Curve *)obedit->data;

		return (cu->flag & CU_3D) && (NULL != cu->editnurb);
	}
	return 0;
}

int ED_operator_editsurf(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_SURF)
		return NULL != ((Curve *)obedit->data)->editnurb;
	return 0;
}

int ED_operator_editfont(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_FONT)
		return NULL != ((Curve *)obedit->data)->editfont;
	return 0;
}

int ED_operator_editlattice(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_LATTICE)
		return NULL != ((Lattice *)obedit->data)->editlatt;
	return 0;
}

int ED_operator_editmball(bContext *C)
{
	Object *obedit = CTX_data_edit_object(C);
	if (obedit && obedit->type == OB_MBALL)
		return NULL != ((MetaBall *)obedit->data)->editelems;
	return 0;
}

int ED_operator_mask(bContext *C)
{
	ScrArea *sa = CTX_wm_area(C);
	if (sa && sa->spacedata.first) {
		switch (sa->spacetype) {
			case SPACE_CLIP:
			{
				SpaceClip *sc = sa->spacedata.first;
				return ED_space_clip_check_show_maskedit(sc);
			}
			case SPACE_SEQ:
			{
				SpaceSeq *sseq = sa->spacedata.first;
				Scene *scene = CTX_data_scene(C);
				return ED_space_sequencer_check_show_maskedit(sseq, scene);
			}
			case SPACE_IMAGE:
			{
				SpaceImage *sima = sa->spacedata.first;
				Scene *scene = CTX_data_scene(C);
				return ED_space_image_check_show_maskedit(scene, sima);
			}
		}
	}

	return false;
}

/* *************************** action zone operator ************************** */

/* operator state vars used:  
 * none
 * 
 * functions:
 * 
 * apply() set actionzone event
 * 
 * exit()	free customdata
 * 
 * callbacks:
 * 
 * exec()	never used
 * 
 * invoke() check if in zone  
 * add customdata, put mouseco and area in it
 * add modal handler
 * 
 * modal()	accept modal events while doing it
 * call apply() with gesture info, active window, nonactive window
 * call exit() and remove handler when LMB confirm
 */

typedef struct sActionzoneData {
	ScrArea *sa1, *sa2;
	AZone *az;
	int x, y, gesture_dir, modifier;
} sActionzoneData;

/* used by other operators too */
static ScrArea *screen_areahascursor(bScreen *scr, int x, int y)
{
	ScrArea *sa = NULL;
	sa = scr->areabase.first;
	while (sa) {
		if (BLI_rcti_isect_pt(&sa->totrct, x, y)) break;
		sa = sa->next;
	}
	
	return sa;
}

/* quick poll to save operators to be created and handled */
static int actionzone_area_poll(bContext *C)
{
	wmWindow *win = CTX_wm_window(C);
	ScrArea *sa = CTX_wm_area(C);
	
	if (sa && win && win->eventstate) {
		const int *xy = &win->eventstate->x;
		AZone *az;
		
		for (az = sa->actionzones.first; az; az = az->next)
			if (BLI_rcti_isect_pt_v(&az->rect, xy))
				return 1;
	}
	return 0;
}

AZone *is_in_area_actionzone(ScrArea *sa, const int xy[2])
{
	AZone *az = NULL;
	
	for (az = sa->actionzones.first; az; az = az->next) {
		if (BLI_rcti_isect_pt_v(&az->rect, xy)) {
			if (az->type == AZONE_AREA) {
				/* no triangle intersect but a hotspot circle based on corner */
				int radius = (xy[0] - az->x1) * (xy[0] - az->x1) + (xy[1] - az->y1) * (xy[1] - az->y1);
				
				if (radius <= AZONESPOT * AZONESPOT)
					break;
			}
			else if (az->type == AZONE_REGION) {
				break;
			}
		}
	}
	
	return az;
}


static void actionzone_exit(wmOperator *op)
{
	if (op->customdata)
		MEM_freeN(op->customdata);
	op->customdata = NULL;
}

/* send EVT_ACTIONZONE event */
static void actionzone_apply(bContext *C, wmOperator *op, int type)
{
	wmEvent event;
	wmWindow *win = CTX_wm_window(C);
	sActionzoneData *sad = op->customdata;
	
	sad->modifier = RNA_int_get(op->ptr, "modifier");
	
	wm_event_init_from_window(win, &event);

	if (type == AZONE_AREA)
		event.type = EVT_ACTIONZONE_AREA;
	else
		event.type = EVT_ACTIONZONE_REGION;
	event.val = 0;
	event.customdata = op->customdata;
	event.customdatafree = true;
	op->customdata = NULL;
	
	wm_event_add(win, &event);
}

static int actionzone_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	AZone *az = is_in_area_actionzone(CTX_wm_area(C), &event->x);
	sActionzoneData *sad;
	
	/* quick escape */
	if (az == NULL)
		return OPERATOR_PASS_THROUGH;
	
	/* ok we do the actionzone */
	sad = op->customdata = MEM_callocN(sizeof(sActionzoneData), "sActionzoneData");
	sad->sa1 = CTX_wm_area(C);
	sad->az = az;
	sad->x = event->x; sad->y = event->y;
	
	/* region azone directly reacts on mouse clicks */
	if (sad->az->type == AZONE_REGION) {
		actionzone_apply(C, op, AZONE_REGION);
		actionzone_exit(op);
		return OPERATOR_FINISHED;
	}
	else {
		/* add modal handler */
		WM_event_add_modal_handler(C, op);
		
		return OPERATOR_RUNNING_MODAL;
	}
}


static int actionzone_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	wmWindow *win = CTX_wm_window(C);
	bScreen *sc = CTX_wm_screen(C);
	sActionzoneData *sad = op->customdata;
	const int winsize_x = WM_window_pixels_x(win);
	const int winsize_y = WM_window_pixels_y(win);

	switch (event->type) {
		case MOUSEMOVE:
		{
			bool is_gesture;

			const int delta_x = (event->x - sad->x);
			const int delta_y = (event->y - sad->y);

			/* calculate gesture direction */
			if (delta_y > ABS(delta_x))
				sad->gesture_dir = 'n';
			else if (delta_x > ABS(delta_y))
				sad->gesture_dir = 'e';
			else if (delta_y < -ABS(delta_x))
				sad->gesture_dir = 's';
			else
				sad->gesture_dir = 'w';
			
			if (sad->az->type == AZONE_AREA) {
				/* once we drag outside the actionzone, register a gesture
				 * check we're not on an edge so join finds the other area */
				is_gesture = ((is_in_area_actionzone(sad->sa1, &event->x) != sad->az) &&
				              (screen_find_active_scredge(sc, winsize_x, winsize_y, event->x, event->y) == NULL));
			}
			else {
				const int delta_min = 1;
				is_gesture = (ABS(delta_x) > delta_min || ABS(delta_y) > delta_min);
			}

			/* gesture is large enough? */
			if (is_gesture) {
				/* second area, for join when (sa1 != sa2) */
				sad->sa2 = screen_areahascursor(sc, event->x, event->y);
				/* apply sends event */
				actionzone_apply(C, op, sad->az->type);
				actionzone_exit(op);
				
				return OPERATOR_FINISHED;
			}
			break;
		}
		case ESCKEY:
			actionzone_exit(op);
			return OPERATOR_CANCELLED;
		case LEFTMOUSE:
			actionzone_exit(op);
			return OPERATOR_CANCELLED;
			
	}
	
	return OPERATOR_RUNNING_MODAL;
}

static void actionzone_cancel(bContext *UNUSED(C), wmOperator *op)
{
	actionzone_exit(op);
}

static void SCREEN_OT_actionzone(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Handle Area Action Zones";
	ot->description = "Handle area action zones for mouse actions/gestures";
	ot->idname = "SCREEN_OT_actionzone";
	
	ot->invoke = actionzone_invoke;
	ot->modal = actionzone_modal;
	ot->poll = actionzone_area_poll;
	ot->cancel = actionzone_cancel;
	
	/* flags */
	ot->flag = OPTYPE_BLOCKING | OPTYPE_INTERNAL;
	
	RNA_def_int(ot->srna, "modifier", 0, 0, 2, "Modifier", "Modifier state", 0, 2);
}

/* ************** swap area operator *********************************** */

/* operator state vars used:  
 * sa1		start area
 * sa2		area to swap with
 * 
 * functions:
 * 
 * init()   set custom data for operator, based on actionzone event custom data
 * 
 * cancel()	cancel the operator
 * 
 * exit()	cleanup, send notifier
 * 
 * callbacks:
 * 
 * invoke() gets called on shift+lmb drag in actionzone
 * call init(), add handler
 * 
 * modal()  accept modal events while doing it
 */

typedef struct sAreaSwapData {
	ScrArea *sa1, *sa2;
} sAreaSwapData;

static int area_swap_init(wmOperator *op, const wmEvent *event)
{
	sAreaSwapData *sd = NULL;
	sActionzoneData *sad = event->customdata;
	
	if (sad == NULL || sad->sa1 == NULL)
		return 0;
	
	sd = MEM_callocN(sizeof(sAreaSwapData), "sAreaSwapData");
	sd->sa1 = sad->sa1;
	sd->sa2 = sad->sa2;
	op->customdata = sd;
	
	return 1;
}


static void area_swap_exit(bContext *C, wmOperator *op)
{
	WM_cursor_modal_restore(CTX_wm_window(C));
	if (op->customdata)
		MEM_freeN(op->customdata);
	op->customdata = NULL;
}

static void area_swap_cancel(bContext *C, wmOperator *op)
{
	area_swap_exit(C, op);
}

static int area_swap_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	
	if (!area_swap_init(op, event))
		return OPERATOR_PASS_THROUGH;
	
	/* add modal handler */
	WM_cursor_modal_set(CTX_wm_window(C), BC_SWAPAREA_CURSOR);
	WM_event_add_modal_handler(C, op);
	
	return OPERATOR_RUNNING_MODAL;
	
}

static int area_swap_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	sActionzoneData *sad = op->customdata;
	
	switch (event->type) {
		case MOUSEMOVE:
			/* second area, for join */
			sad->sa2 = screen_areahascursor(CTX_wm_screen(C), event->x, event->y);
			break;
		case LEFTMOUSE: /* release LMB */
			if (event->val == KM_RELEASE) {
				if (!sad->sa2 || sad->sa1 == sad->sa2) {
					area_swap_cancel(C, op);
					return OPERATOR_CANCELLED;
				}

				ED_area_tag_redraw(sad->sa1);
				ED_area_tag_redraw(sad->sa2);

				ED_area_swapspace(C, sad->sa1, sad->sa2);
				
				area_swap_exit(C, op);
				
				WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
				
				return OPERATOR_FINISHED;
			}
			break;
			
		case ESCKEY:
			area_swap_cancel(C, op);
			return OPERATOR_CANCELLED;
	}
	return OPERATOR_RUNNING_MODAL;
}

static void SCREEN_OT_area_swap(wmOperatorType *ot)
{
	ot->name = "Swap Areas";
	ot->description = "Swap selected areas screen positions";
	ot->idname = "SCREEN_OT_area_swap";
	
	ot->invoke = area_swap_invoke;
	ot->modal = area_swap_modal;
	ot->poll = ED_operator_areaactive;
	ot->cancel = area_swap_cancel;
	
	ot->flag = OPTYPE_BLOCKING;
}

/* *********** Duplicate area as new window operator ****************** */

/* operator callback */
static int area_dupli_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	wmWindow *newwin, *win;
	bScreen *newsc, *sc;
	ScrArea *sa;
	rcti rect;
	
	win = CTX_wm_window(C);
	sc = CTX_wm_screen(C);
	sa = CTX_wm_area(C);
	
	/* XXX hrmf! */
	if (event->type == EVT_ACTIONZONE_AREA) {
		sActionzoneData *sad = event->customdata;
		
		if (sad == NULL)
			return OPERATOR_PASS_THROUGH;
		
		sa = sad->sa1;
	}

	/* adds window to WM */
	rect = sa->totrct;
	BLI_rcti_translate(&rect, win->posx, win->posy);
	rect.xmax = rect.xmin + BLI_rcti_size_x(&rect) / U.pixelsize;
	rect.ymax = rect.ymin + BLI_rcti_size_y(&rect) / U.pixelsize;

	newwin = WM_window_open(C, &rect);
	
	/* allocs new screen and adds to newly created window, using window size */
	newsc = ED_screen_add(newwin, CTX_data_scene(C), sc->id.name + 2);
	newwin->screen = newsc;
	
	/* copy area to new screen */
	ED_area_data_copy((ScrArea *)newsc->areabase.first, sa, true);

	ED_area_tag_redraw((ScrArea *)newsc->areabase.first);

	/* screen, areas init */
	WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
	
	if (event->type == EVT_ACTIONZONE_AREA)
		actionzone_exit(op);
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_area_dupli(wmOperatorType *ot)
{
	ot->name = "Duplicate Area into New Window";
	ot->description = "Duplicate selected area into new window";
	ot->idname = "SCREEN_OT_area_dupli";
	
	ot->invoke = area_dupli_invoke;
	ot->poll = ED_operator_areaactive;
}


/* ************** move area edge operator *********************************** */

/* operator state vars used:  
 * x, y             mouse coord near edge
 * delta            movement of edge
 * 
 * functions:
 * 
 * init()   set default property values, find edge based on mouse coords, test
 * if the edge can be moved, select edges, calculate min and max movement
 * 
 * apply()	apply delta on selection
 * 
 * exit()	cleanup, send notifier
 * 
 * cancel() cancel moving
 * 
 * callbacks:
 * 
 * exec()   execute without any user interaction, based on properties
 * call init(), apply(), exit()
 * 
 * invoke() gets called on mouse click near edge
 * call init(), add handler
 * 
 * modal()  accept modal events while doing it
 * call apply() with delta motion
 * call exit() and remove handler
 */

typedef struct sAreaMoveData {
	int bigger, smaller, origval, step;
	char dir;
} sAreaMoveData;

/* helper call to move area-edge, sets limits
 * need window size in order to get correct limits */
static void area_move_set_limits(bScreen *sc, int dir,
                                 const int winsize_x, const int winsize_y,
                                 int *bigger, int *smaller)
{
	ScrArea *sa;
	int areaminy = ED_area_headersize();
	int areamin;
	
	/* we check all areas and test for free space with MINSIZE */
	*bigger = *smaller = 100000;
	
	for (sa = sc->areabase.first; sa; sa = sa->next) {
		if (dir == 'h') {
			int y1;
			areamin = areaminy;
			
			if (sa->v1->vec.y > 0)
				areamin += U.pixelsize;
			if (sa->v2->vec.y < winsize_y - 1)
				areamin += U.pixelsize;
			
			y1 = sa->v2->vec.y - sa->v1->vec.y + 1 - areamin;
			
			/* if top or down edge selected, test height */
			if (sa->v1->editflag && sa->v4->editflag)
				*bigger = min_ii(*bigger, y1);
			else if (sa->v2->editflag && sa->v3->editflag)
				*smaller = min_ii(*smaller, y1);
		}
		else {
			int x1;
			areamin = AREAMINX;
			
			if (sa->v1->vec.x > 0)
				areamin += U.pixelsize;
			if (sa->v4->vec.x < winsize_x - 1)
				areamin += U.pixelsize;
			
			x1 = sa->v4->vec.x - sa->v1->vec.x + 1 - areamin;
			
			/* if left or right edge selected, test width */
			if (sa->v1->editflag && sa->v2->editflag)
				*bigger = min_ii(*bigger, x1);
			else if (sa->v3->editflag && sa->v4->editflag)
				*smaller = min_ii(*smaller, x1);
		}
	}
}

/* validate selection inside screen, set variables OK */
/* return 0: init failed */
static int area_move_init(bContext *C, wmOperator *op)
{
	bScreen *sc = CTX_wm_screen(C);
	wmWindow *win = CTX_wm_window(C);
	ScrEdge *actedge;
	sAreaMoveData *md;
	ScrVert *v1;
	const int winsize_x = WM_window_pixels_x(win);
	const int winsize_y = WM_window_pixels_y(win);
	int x, y;
	
	/* required properties */
	x = RNA_int_get(op->ptr, "x");
	y = RNA_int_get(op->ptr, "y");
	
	/* setup */
	actedge = screen_find_active_scredge(sc, winsize_x, winsize_y, x, y);
	if (actedge == NULL) return 0;
	
	md = MEM_callocN(sizeof(sAreaMoveData), "sAreaMoveData");
	op->customdata = md;
	
	md->dir = scredge_is_horizontal(actedge) ? 'h' : 'v';
	if (md->dir == 'h') md->origval = actedge->v1->vec.y;
	else md->origval = actedge->v1->vec.x;
	
	select_connected_scredge(sc, actedge);
	/* now all vertices with 'flag==1' are the ones that can be moved. Move this to editflag */
	for (v1 = sc->vertbase.first; v1; v1 = v1->next)
		v1->editflag = v1->flag;
	
	area_move_set_limits(sc, md->dir, winsize_x, winsize_y, &md->bigger, &md->smaller);
	
	return 1;
}

/* moves selected screen edge amount of delta, used by split & move */
static void area_move_apply_do(bContext *C, int origval, int delta, int dir, int bigger, int smaller)
{
	wmWindow *win = CTX_wm_window(C);
	const int winsize_x = WM_window_pixels_x(win);
	const int winsize_y = WM_window_pixels_y(win);
	bScreen *sc = CTX_wm_screen(C);
	ScrVert *v1;
	ScrArea *sa;
	int doredraw = 0;
	int oldval;
	
	delta = CLAMPIS(delta, -smaller, bigger);
	
	for (v1 = sc->vertbase.first; v1; v1 = v1->next) {
		if (v1->editflag) {
			/* that way a nice AREAGRID  */
			if ((dir == 'v') && v1->vec.x > 0 && v1->vec.x < winsize_x - 1) {
				oldval = v1->vec.x;
				v1->vec.x = origval + delta;
				
				if (delta != bigger && delta != -smaller) {
					v1->vec.x -= (v1->vec.x % AREAGRID);
					v1->vec.x = CLAMPIS(v1->vec.x, origval - smaller, origval + bigger);
				}
				if (oldval != v1->vec.x)
					doredraw = 1;
			}
			if ((dir == 'h') && v1->vec.y > 0 && v1->vec.y < winsize_y - 1) {
				oldval = v1->vec.y;
				v1->vec.y = origval + delta;
				
				if (delta != bigger && delta != smaller) {
					v1->vec.y -= (v1->vec.y % AREAGRID);
					v1->vec.y = CLAMPIS(v1->vec.y, origval - smaller, origval + bigger);
				}
				if (oldval != v1->vec.y)
					doredraw = 1;
			}
		}
	}

	/* only redraw if we actually moved a screen vert, for AREAGRID */
	if (doredraw) {
		for (sa = sc->areabase.first; sa; sa = sa->next) {
			if (sa->v1->editflag || sa->v2->editflag || sa->v3->editflag || sa->v4->editflag)
				ED_area_tag_redraw(sa);
		}

		WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL); /* redraw everything */
	}
}

static void area_move_apply(bContext *C, wmOperator *op)
{
	sAreaMoveData *md = op->customdata;
	int delta;
	
	delta = RNA_int_get(op->ptr, "delta");
	area_move_apply_do(C, md->origval, delta, md->dir, md->bigger, md->smaller);
}

static void area_move_exit(bContext *C, wmOperator *op)
{
	if (op->customdata)
		MEM_freeN(op->customdata);
	op->customdata = NULL;
	
	/* this makes sure aligned edges will result in aligned grabbing */
	removedouble_scrverts(CTX_wm_screen(C));
	removedouble_scredges(CTX_wm_screen(C));
}

static int area_move_exec(bContext *C, wmOperator *op)
{
	if (!area_move_init(C, op))
		return OPERATOR_CANCELLED;
	
	area_move_apply(C, op);
	area_move_exit(C, op);
	
	return OPERATOR_FINISHED;
}

/* interaction callback */
static int area_move_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	RNA_int_set(op->ptr, "x", event->x);
	RNA_int_set(op->ptr, "y", event->y);
	
	if (!area_move_init(C, op)) 
		return OPERATOR_PASS_THROUGH;
	
	/* add temp handler */
	WM_event_add_modal_handler(C, op);
	
	return OPERATOR_RUNNING_MODAL;
}

static void area_move_cancel(bContext *C, wmOperator *op)
{
	
	RNA_int_set(op->ptr, "delta", 0);
	area_move_apply(C, op);
	area_move_exit(C, op);
}

/* modal callback for while moving edges */
static int area_move_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	sAreaMoveData *md = op->customdata;
	int delta, x, y;
	
	/* execute the events */
	switch (event->type) {
		case MOUSEMOVE:
		{
			x = RNA_int_get(op->ptr, "x");
			y = RNA_int_get(op->ptr, "y");
			
			delta = (md->dir == 'v') ? event->x - x : event->y - y;
			if (md->step) delta = delta - (delta % md->step);
			RNA_int_set(op->ptr, "delta", delta);
			
			area_move_apply(C, op);
			break;
		}
		case EVT_MODAL_MAP:
		{
			switch (event->val) {
				case KM_MODAL_APPLY:
					area_move_exit(C, op);
					return OPERATOR_FINISHED;
					
				case KM_MODAL_CANCEL:
					area_move_cancel(C, op);
					return OPERATOR_CANCELLED;
					
				case KM_MODAL_STEP10:
					md->step = 10;
					break;
				case KM_MODAL_STEP10_OFF:
					md->step = 0;
					break;
			}
			break;
		}
	}
	
	return OPERATOR_RUNNING_MODAL;
}

static void SCREEN_OT_area_move(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Move Area Edges";
	ot->description = "Move selected area edges";
	ot->idname = "SCREEN_OT_area_move";
	
	ot->exec = area_move_exec;
	ot->invoke = area_move_invoke;
	ot->cancel = area_move_cancel;
	ot->modal = area_move_modal;
	ot->poll = ED_operator_screen_mainwinactive; /* when mouse is over area-edge */
	
	/* flags */
	ot->flag = OPTYPE_BLOCKING | OPTYPE_INTERNAL;
	
	/* rna */
	RNA_def_int(ot->srna, "x", 0, INT_MIN, INT_MAX, "X", "", INT_MIN, INT_MAX);
	RNA_def_int(ot->srna, "y", 0, INT_MIN, INT_MAX, "Y", "", INT_MIN, INT_MAX);
	RNA_def_int(ot->srna, "delta", 0, INT_MIN, INT_MAX, "Delta", "", INT_MIN, INT_MAX);
}

/* ************** split area operator *********************************** */

/* 
 * operator state vars:  
 * fac              spit point
 * dir              direction 'v' or 'h'
 * 
 * operator customdata:
 * area             pointer to (active) area
 * x, y			last used mouse pos
 * (more, see below)
 * 
 * functions:
 * 
 * init()   set default property values, find area based on context
 * 
 * apply()	split area based on state vars
 * 
 * exit()	cleanup, send notifier
 * 
 * cancel() remove duplicated area
 * 
 * callbacks:
 * 
 * exec()   execute without any user interaction, based on state vars
 * call init(), apply(), exit()
 * 
 * invoke() gets called on mouse click in action-widget
 * call init(), add modal handler
 * call apply() with initial motion
 * 
 * modal()  accept modal events while doing it
 * call move-areas code with delta motion
 * call exit() or cancel() and remove handler
 */

typedef struct sAreaSplitData {
	int x, y;   /* last used mouse position */
	
	int origval;            /* for move areas */
	int bigger, smaller;    /* constraints for moving new edge */
	int delta;              /* delta move edge */
	int origmin, origsize;  /* to calculate fac, for property storage */
	int previewmode;        /* draw previewline, then split */

	ScrEdge *nedge;         /* new edge */
	ScrArea *sarea;         /* start area */
	ScrArea *narea;         /* new area */
	
} sAreaSplitData;

/* generic init, menu case, doesn't need active area */
static int area_split_menu_init(bContext *C, wmOperator *op)
{
	sAreaSplitData *sd;
	
	/* custom data */
	sd = (sAreaSplitData *)MEM_callocN(sizeof(sAreaSplitData), "op_area_split");
	op->customdata = sd;
	
	sd->sarea = CTX_wm_area(C);
	
	if (sd->sarea) {
		int dir = RNA_enum_get(op->ptr, "direction");

		if (dir == 'h')
			sd->sarea->flag |= AREA_FLAG_DRAWSPLIT_H;
		else
			sd->sarea->flag |= AREA_FLAG_DRAWSPLIT_V;
	}
	return 1;
}

/* generic init, no UI stuff here, assumes active area */
static int area_split_init(bContext *C, wmOperator *op)
{
	ScrArea *sa = CTX_wm_area(C);
	sAreaSplitData *sd;
	int areaminy = ED_area_headersize() + 1;
	int dir;
	
	/* required context */
	if (sa == NULL) return 0;
	
	/* required properties */
	dir = RNA_enum_get(op->ptr, "direction");
	
	/* minimal size */
	if (dir == 'v' && sa->winx < 2 * AREAMINX) return 0;
	if (dir == 'h' && sa->winy < 2 * areaminy) return 0;
	
	/* custom data */
	sd = (sAreaSplitData *)MEM_callocN(sizeof(sAreaSplitData), "op_area_split");
	op->customdata = sd;
	
	sd->sarea = sa;
	sd->origsize = dir == 'v' ? sa->winx : sa->winy;
	sd->origmin = dir == 'v' ? sa->totrct.xmin : sa->totrct.ymin;
	
	return 1;
}

/* with sa as center, sb is located at: 0=W, 1=N, 2=E, 3=S */
/* used with split operator */
static ScrEdge *area_findsharededge(bScreen *screen, ScrArea *sa, ScrArea *sb)
{
	ScrVert *sav1 = sa->v1;
	ScrVert *sav2 = sa->v2;
	ScrVert *sav3 = sa->v3;
	ScrVert *sav4 = sa->v4;
	ScrVert *sbv1 = sb->v1;
	ScrVert *sbv2 = sb->v2;
	ScrVert *sbv3 = sb->v3;
	ScrVert *sbv4 = sb->v4;
	
	if (sav1 == sbv4 && sav2 == sbv3) { /* sa to right of sb = W */
		return screen_findedge(screen, sav1, sav2);
	}
	else if (sav2 == sbv1 && sav3 == sbv4) { /* sa to bottom of sb = N */
		return screen_findedge(screen, sav2, sav3);
	}
	else if (sav3 == sbv2 && sav4 == sbv1) { /* sa to left of sb = E */
		return screen_findedge(screen, sav3, sav4);
	}
	else if (sav1 == sbv2 && sav4 == sbv3) { /* sa on top of sb = S*/
		return screen_findedge(screen, sav1, sav4);
	}
	
	return NULL;
}


/* do the split, return success */
static int area_split_apply(bContext *C, wmOperator *op)
{
	bScreen *sc = CTX_wm_screen(C);
	sAreaSplitData *sd = (sAreaSplitData *)op->customdata;
	float fac;
	int dir;
	
	fac = RNA_float_get(op->ptr, "factor");
	dir = RNA_enum_get(op->ptr, "direction");
	
	sd->narea = area_split(sc, sd->sarea, dir, fac, 0); /* 0 = no merge */
	
	if (sd->narea) {
		ScrVert *sv;
		
		sd->nedge = area_findsharededge(sc, sd->sarea, sd->narea);
		
		/* select newly created edge, prepare for moving edge */
		for (sv = sc->vertbase.first; sv; sv = sv->next)
			sv->editflag = 0;
		
		sd->nedge->v1->editflag = 1;
		sd->nedge->v2->editflag = 1;
		
		if (dir == 'h') sd->origval = sd->nedge->v1->vec.y;
		else sd->origval = sd->nedge->v1->vec.x;

		ED_area_tag_redraw(sd->sarea);
		ED_area_tag_redraw(sd->narea);

		WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
		
		return 1;
	}
	
	return 0;
}

static void area_split_exit(bContext *C, wmOperator *op)
{
	if (op->customdata) {
		sAreaSplitData *sd = (sAreaSplitData *)op->customdata;
		if (sd->sarea) ED_area_tag_redraw(sd->sarea);
		if (sd->narea) ED_area_tag_redraw(sd->narea);

		if (sd->sarea)
			sd->sarea->flag &= ~(AREA_FLAG_DRAWSPLIT_H | AREA_FLAG_DRAWSPLIT_V);
		
		MEM_freeN(op->customdata);
		op->customdata = NULL;
	}
	
	WM_cursor_modal_restore(CTX_wm_window(C));
	WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
	
	/* this makes sure aligned edges will result in aligned grabbing */
	removedouble_scrverts(CTX_wm_screen(C));
	removedouble_scredges(CTX_wm_screen(C));
}


/* UI callback, adds new handler */
static int area_split_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	wmWindow *win = CTX_wm_window(C);
	bScreen *sc = CTX_wm_screen(C);
	sAreaSplitData *sd;
	const int winsize_x = WM_window_pixels_x(win);
	const int winsize_y = WM_window_pixels_y(win);
	int dir;
	
	/* no full window splitting allowed */
	if (sc->full != SCREENNORMAL)
		return OPERATOR_CANCELLED;
	
	if (event->type == EVT_ACTIONZONE_AREA) {
		sActionzoneData *sad = event->customdata;
		
		if (sad == NULL || sad->modifier > 0) {
			return OPERATOR_PASS_THROUGH;
		}
		
		/* verify *sad itself */
		if (sad->sa1 == NULL || sad->az == NULL)
			return OPERATOR_PASS_THROUGH;
		
		/* is this our *sad? if areas not equal it should be passed on */
		if (CTX_wm_area(C) != sad->sa1 || sad->sa1 != sad->sa2)
			return OPERATOR_PASS_THROUGH;
		
		/* prepare operator state vars */
		if (sad->gesture_dir == 'n' || sad->gesture_dir == 's') {
			dir = 'h';
			RNA_float_set(op->ptr, "factor", ((float)(event->x - sad->sa1->v1->vec.x)) / (float)sad->sa1->winx);
		}
		else {
			dir = 'v';
			RNA_float_set(op->ptr, "factor", ((float)(event->y - sad->sa1->v1->vec.y)) / (float)sad->sa1->winy);
		}
		RNA_enum_set(op->ptr, "direction", dir);
		
		/* general init, also non-UI case, adds customdata, sets area and defaults */
		if (!area_split_init(C, op))
			return OPERATOR_PASS_THROUGH;
		
	}
	else {
		ScrEdge *actedge;
		int x, y;
		
		/* retrieve initial mouse coord, so we can find the active edge */
		if (RNA_struct_property_is_set(op->ptr, "mouse_x"))
			x = RNA_int_get(op->ptr, "mouse_x");
		else
			x = event->x;
		
		if (RNA_struct_property_is_set(op->ptr, "mouse_y"))
			y = RNA_int_get(op->ptr, "mouse_y");
		else
			y = event->x;
		
		actedge = screen_find_active_scredge(sc, winsize_x, winsize_y, x, y);
		if (actedge == NULL)
			return OPERATOR_CANCELLED;
		
		dir = scredge_is_horizontal(actedge) ? 'v' : 'h';
		
		RNA_enum_set(op->ptr, "direction", dir);
		
		/* special case, adds customdata, sets defaults */
		if (!area_split_menu_init(C, op))
			return OPERATOR_CANCELLED;
		
	}
	
	sd = (sAreaSplitData *)op->customdata;
	
	sd->x = event->x;
	sd->y = event->y;
	
	if (event->type == EVT_ACTIONZONE_AREA) {
		
		/* do the split */
		if (area_split_apply(C, op)) {
			area_move_set_limits(sc, dir, winsize_x, winsize_y, &sd->bigger, &sd->smaller);
			
			/* add temp handler for edge move or cancel */
			WM_event_add_modal_handler(C, op);
			
			return OPERATOR_RUNNING_MODAL;
		}
	}
	else {
		sd->previewmode = 1;
		/* add temp handler for edge move or cancel */
		WM_event_add_modal_handler(C, op);
		
		return OPERATOR_RUNNING_MODAL;
		
	}
	
	return OPERATOR_PASS_THROUGH;
}

/* function to be called outside UI context, or for redo */
static int area_split_exec(bContext *C, wmOperator *op)
{
	
	if (!area_split_init(C, op))
		return OPERATOR_CANCELLED;
	
	area_split_apply(C, op);
	area_split_exit(C, op);
	
	return OPERATOR_FINISHED;
}


static void area_split_cancel(bContext *C, wmOperator *op)
{
	sAreaSplitData *sd = (sAreaSplitData *)op->customdata;
	
	if (sd->previewmode) {
	}
	else {
		if (screen_area_join(C, CTX_wm_screen(C), sd->sarea, sd->narea)) {
			if (CTX_wm_area(C) == sd->narea) {
				CTX_wm_area_set(C, NULL);
				CTX_wm_region_set(C, NULL);
			}
			sd->narea = NULL;
		}
	}
	area_split_exit(C, op);
}

static int area_split_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	sAreaSplitData *sd = (sAreaSplitData *)op->customdata;
	float fac;
	int dir;
	
	/* execute the events */
	switch (event->type) {
		case MOUSEMOVE:
			dir = RNA_enum_get(op->ptr, "direction");
			
			sd->delta = (dir == 'v') ? event->x - sd->origval : event->y - sd->origval;
			if (sd->previewmode == 0)
				area_move_apply_do(C, sd->origval, sd->delta, dir, sd->bigger, sd->smaller);
			else {
				if (sd->sarea) {
					sd->sarea->flag &= ~(AREA_FLAG_DRAWSPLIT_H | AREA_FLAG_DRAWSPLIT_V);
					ED_area_tag_redraw(sd->sarea);
				}
				sd->sarea = screen_areahascursor(CTX_wm_screen(C), event->x, event->y);  /* area context not set */
				
				if (sd->sarea) {
					ED_area_tag_redraw(sd->sarea);
					if (dir == 'v') {
						sd->origsize = sd->sarea->winx;
						sd->origmin = sd->sarea->totrct.xmin;
						sd->sarea->flag |= AREA_FLAG_DRAWSPLIT_V;
					}
					else {
						sd->origsize = sd->sarea->winy;
						sd->origmin = sd->sarea->totrct.ymin;
						sd->sarea->flag |= AREA_FLAG_DRAWSPLIT_H;
					}
				}
				
				CTX_wm_window(C)->screen->do_draw = true;

			}
			
			fac = (dir == 'v') ? event->x - sd->origmin : event->y - sd->origmin;
			RNA_float_set(op->ptr, "factor", fac / (float)sd->origsize);
			
			break;
			
		case LEFTMOUSE:
			if (sd->previewmode) {
				area_split_apply(C, op);
				area_split_exit(C, op);
				return OPERATOR_FINISHED;
			}
			else {
				if (event->val == KM_RELEASE) { /* mouse up */
					area_split_exit(C, op);
					return OPERATOR_FINISHED;
				}
			}
			break;
			
		case MIDDLEMOUSE:
		case TABKEY:
			if (sd->previewmode == 0) {
			}
			else {
				dir = RNA_enum_get(op->ptr, "direction");
				
				if (event->val == KM_PRESS) {
					if (sd->sarea) {
						sd->sarea->flag &= ~(AREA_FLAG_DRAWSPLIT_H | AREA_FLAG_DRAWSPLIT_V);
						ED_area_tag_redraw(sd->sarea);
						
						if (dir == 'v') {
							RNA_enum_set(op->ptr, "direction", 'h');
							sd->sarea->flag |= AREA_FLAG_DRAWSPLIT_H;
							
							WM_cursor_set(CTX_wm_window(C), CURSOR_X_MOVE);
						}
						else {
							RNA_enum_set(op->ptr, "direction", 'v');
							sd->sarea->flag |= AREA_FLAG_DRAWSPLIT_V;
							
							WM_cursor_set(CTX_wm_window(C), CURSOR_Y_MOVE);
						}
					}
				}
			}
			
			break;
			
		case RIGHTMOUSE: /* cancel operation */
		case ESCKEY:
			area_split_cancel(C, op);
			return OPERATOR_CANCELLED;
	}
	
	return OPERATOR_RUNNING_MODAL;
}

static EnumPropertyItem prop_direction_items[] = {
	{'h', "HORIZONTAL", 0, "Horizontal", ""},
	{'v', "VERTICAL", 0, "Vertical", ""},
	{0, NULL, 0, NULL, NULL}
};

static void SCREEN_OT_area_split(wmOperatorType *ot)
{
	ot->name = "Split Area";
	ot->description = "Split selected area into new windows";
	ot->idname = "SCREEN_OT_area_split";
	
	ot->exec = area_split_exec;
	ot->invoke = area_split_invoke;
	ot->modal = area_split_modal;
	ot->cancel = area_split_cancel;
	
	ot->poll = screen_active_editable;

	/* flags */
	ot->flag = OPTYPE_BLOCKING | OPTYPE_INTERNAL;
	
	/* rna */
	RNA_def_enum(ot->srna, "direction", prop_direction_items, 'h', "Direction", "");
	RNA_def_float(ot->srna, "factor", 0.5f, 0.0, 1.0, "Factor", "", 0.0, 1.0);
	RNA_def_int(ot->srna, "mouse_x", -100, INT_MIN, INT_MAX, "Mouse X", "", INT_MIN, INT_MAX);
	RNA_def_int(ot->srna, "mouse_y", -100, INT_MIN, INT_MAX, "Mouse Y", "", INT_MIN, INT_MAX);
}



/* ************** scale region edge operator *********************************** */

typedef struct RegionMoveData {
	AZone *az;
	ARegion *ar;
	ScrArea *sa;
	int bigger, smaller, origval;
	int origx, origy;
	int maxsize;
	AZEdge edge;
	
} RegionMoveData;


static int area_max_regionsize(ScrArea *sa, ARegion *scalear, AZEdge edge)
{
	ARegion *ar;
	int dist;
	
	if (edge == AE_RIGHT_TO_TOPLEFT || edge == AE_LEFT_TO_TOPRIGHT) {
		dist = BLI_rcti_size_x(&sa->totrct);
	}
	else {  /* AE_BOTTOM_TO_TOPLEFT, AE_TOP_TO_BOTTOMRIGHT */
		dist = BLI_rcti_size_y(&sa->totrct);
	}
	
	/* subtractwidth of regions on opposite side 
	 * prevents dragging regions into other opposite regions */
	for (ar = sa->regionbase.first; ar; ar = ar->next) {
		if (ar == scalear)
			continue;
		
		if (scalear->alignment == RGN_ALIGN_TOP && ar->alignment == RGN_ALIGN_BOTTOM)
			dist -= ar->winy;
		else if (scalear->alignment == RGN_ALIGN_BOTTOM && ar->alignment == RGN_ALIGN_TOP)
			dist -= ar->winy;
		else if (scalear->alignment == RGN_ALIGN_LEFT && ar->alignment == RGN_ALIGN_RIGHT)
			dist -= ar->winx;
		else if (scalear->alignment == RGN_ALIGN_RIGHT && ar->alignment == RGN_ALIGN_LEFT)
			dist -= ar->winx;
		
		/* case of regions in regions, like operator properties panel */
		/* these can sit on top of other regions such as headers, so account for this */
		else if (edge == AE_BOTTOM_TO_TOPLEFT && scalear->alignment & RGN_ALIGN_TOP &&
		         ar->alignment == RGN_ALIGN_TOP && ar->regiontype == RGN_TYPE_HEADER)
		{
			dist -= ar->winy;
		}
		else if (edge == AE_TOP_TO_BOTTOMRIGHT && scalear->alignment & RGN_ALIGN_BOTTOM &&
		         ar->alignment == RGN_ALIGN_BOTTOM && ar->regiontype == RGN_TYPE_HEADER)
		{
			dist -= ar->winy;
		}
	}

	return dist;
}

static int region_scale_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	sActionzoneData *sad = event->customdata;
	AZone *az;
	
	if (event->type != EVT_ACTIONZONE_REGION) {
		BKE_report(op->reports, RPT_ERROR, "Can only scale region size from an action zone");
		return OPERATOR_CANCELLED;
	}
	
	az = sad->az;
	
	if (az->ar) {
		RegionMoveData *rmd = MEM_callocN(sizeof(RegionMoveData), "RegionMoveData");
		int maxsize;
		
		op->customdata = rmd;
		
		rmd->az = az;
		rmd->ar = az->ar;
		rmd->sa = sad->sa1;
		rmd->edge = az->edge;
		rmd->origx = event->x;
		rmd->origy = event->y;
		rmd->maxsize = area_max_regionsize(rmd->sa, rmd->ar, rmd->edge);
		
		/* if not set we do now, otherwise it uses type */
		if (rmd->ar->sizex == 0)
			rmd->ar->sizex = rmd->ar->winx;
		if (rmd->ar->sizey == 0)
			rmd->ar->sizey = rmd->ar->winy;
		
		/* now copy to regionmovedata */
		if (rmd->edge == AE_LEFT_TO_TOPRIGHT || rmd->edge == AE_RIGHT_TO_TOPLEFT) {
			rmd->origval = rmd->ar->sizex;
		}
		else {
			rmd->origval = rmd->ar->sizey;
		}
		
		/* limit headers to standard height for now */
		if (rmd->ar->regiontype == RGN_TYPE_HEADER)
			maxsize = ED_area_headersize();
		else
			maxsize = 1000;
		
		CLAMP(rmd->maxsize, 0, maxsize);
		
		/* add temp handler */
		WM_event_add_modal_handler(C, op);
		
		return OPERATOR_RUNNING_MODAL;
	}
	
	return OPERATOR_FINISHED;
}

static int region_scale_get_maxsize(RegionMoveData *rmd)
{
	int maxsize = 0;

	if (rmd->edge == AE_LEFT_TO_TOPRIGHT || rmd->edge == AE_RIGHT_TO_TOPLEFT) {
		return  (int) ( (rmd->sa->winx / UI_DPI_FAC) - UI_UNIT_X);
	}

	if (rmd->ar->regiontype == RGN_TYPE_TOOL_PROPS) {
		/* this calculation seems overly verbose
		 * can someone explain why this method is necessary? - campbell */
		maxsize = rmd->maxsize - ((rmd->sa->headertype == HEADERTOP) ? UI_UNIT_Y * 2 : UI_UNIT_Y) - (UI_UNIT_Y / 4);
	}

	return maxsize;
}

static void region_scale_validate_size(RegionMoveData *rmd)
{
	if ((rmd->ar->flag & RGN_FLAG_HIDDEN) == 0) {
		short *size, maxsize = -1;


		if (rmd->edge == AE_LEFT_TO_TOPRIGHT || rmd->edge == AE_RIGHT_TO_TOPLEFT)
			size = &rmd->ar->sizex;
		else
			size = &rmd->ar->sizey;

		maxsize = region_scale_get_maxsize(rmd);

		if (*size > maxsize && maxsize > 0)
			*size = maxsize;
	}
}

static void region_scale_toggle_hidden(bContext *C, RegionMoveData *rmd)
{
	region_toggle_hidden(C, rmd->ar, 0);
	region_scale_validate_size(rmd);
}

static int region_scale_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	RegionMoveData *rmd = op->customdata;
	int delta;
	
	/* execute the events */
	switch (event->type) {
		case MOUSEMOVE:
			
			if (rmd->edge == AE_LEFT_TO_TOPRIGHT || rmd->edge == AE_RIGHT_TO_TOPLEFT) {
				delta = event->x - rmd->origx;
				if (rmd->edge == AE_LEFT_TO_TOPRIGHT) delta = -delta;
				
				/* region sizes now get multiplied */
				delta /= UI_DPI_FAC;
				
				rmd->ar->sizex = rmd->origval + delta;
				CLAMP(rmd->ar->sizex, 0, rmd->maxsize);
				
				if (rmd->ar->sizex < UI_UNIT_X) {
					rmd->ar->sizex = rmd->origval;
					if (!(rmd->ar->flag & RGN_FLAG_HIDDEN))
						region_scale_toggle_hidden(C, rmd);
				}
				else if (rmd->ar->flag & RGN_FLAG_HIDDEN)
					region_scale_toggle_hidden(C, rmd);
			}
			else {
				int maxsize = region_scale_get_maxsize(rmd);
				delta = event->y - rmd->origy;
				if (rmd->edge == AE_BOTTOM_TO_TOPLEFT) delta = -delta;
				
				/* region sizes now get multiplied */
				delta /= UI_DPI_FAC;

				rmd->ar->sizey = rmd->origval + delta;
				CLAMP(rmd->ar->sizey, 0, rmd->maxsize);

				/* note, 'UI_UNIT_Y/4' means you need to drag the header almost
				 * all the way down for it to become hidden, this is done
				 * otherwise its too easy to do this by accident */
				if (rmd->ar->sizey < UI_UNIT_Y / 4) {
					rmd->ar->sizey = rmd->origval;
					if (!(rmd->ar->flag & RGN_FLAG_HIDDEN))
						region_scale_toggle_hidden(C, rmd);
				}
				else if (maxsize > 0 && (rmd->ar->sizey > maxsize)) 
					rmd->ar->sizey = maxsize;
				else if (rmd->ar->flag & RGN_FLAG_HIDDEN)
					region_scale_toggle_hidden(C, rmd);
			}
			ED_area_tag_redraw(rmd->sa);
			WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
			
			break;
			
		case LEFTMOUSE:
			if (event->val == KM_RELEASE) {
				
				if (ABS(event->x - rmd->origx) < 2 && ABS(event->y - rmd->origy) < 2) {
					if (rmd->ar->flag & RGN_FLAG_HIDDEN) {
						region_scale_toggle_hidden(C, rmd);
					}
					else if (rmd->ar->flag & RGN_FLAG_TOO_SMALL) {
						region_scale_validate_size(rmd);
					}

					ED_area_tag_redraw(rmd->sa);
					WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
				}
				MEM_freeN(op->customdata);
				op->customdata = NULL;
				
				return OPERATOR_FINISHED;
			}
			break;
			
		case ESCKEY:
			break;
	}
	
	return OPERATOR_RUNNING_MODAL;
}

static void region_scale_cancel(bContext *UNUSED(C), wmOperator *op)
{
	MEM_freeN(op->customdata);
	op->customdata = NULL;
}

static void SCREEN_OT_region_scale(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Scale Region Size";
	ot->description = "Scale selected area";
	ot->idname = "SCREEN_OT_region_scale";
	
	ot->invoke = region_scale_invoke;
	ot->modal = region_scale_modal;
	ot->cancel = region_scale_cancel;
	
	ot->poll = ED_operator_areaactive;
	
	/* flags */
	ot->flag = OPTYPE_BLOCKING | OPTYPE_INTERNAL;
}


/* ************** frame change operator ***************************** */

/* function to be called outside UI context, or for redo */
static int frame_offset_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	int delta;
	
	delta = RNA_int_get(op->ptr, "delta");

	CFRA += delta;
	FRAMENUMBER_MIN_CLAMP(CFRA);
	SUBFRA = 0.f;
	
	sound_seek_scene(bmain, scene);

	WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_frame_offset(wmOperatorType *ot)
{
	ot->name = "Frame Offset";
	ot->idname = "SCREEN_OT_frame_offset";
	ot->description = "Move current frame forward/backward by a given number";
	
	ot->exec = frame_offset_exec;
	
	ot->poll = ED_operator_screenactive_norender;
	ot->flag = 0;
	
	/* rna */
	RNA_def_int(ot->srna, "delta", 0, INT_MIN, INT_MAX, "Delta", "", INT_MIN, INT_MAX);
}


/* function to be called outside UI context, or for redo */
static int frame_jump_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	wmTimer *animtimer = CTX_wm_screen(C)->animtimer;

	/* Don't change CFRA directly if animtimer is running as this can cause
	 * first/last frame not to be actually shown (bad since for example physics
	 * simulations aren't reset properly).
	 */
	if (animtimer) {
		ScreenAnimData *sad = animtimer->customdata;
		
		sad->flag |= ANIMPLAY_FLAG_USE_NEXT_FRAME;
		
		if (RNA_boolean_get(op->ptr, "end"))
			sad->nextfra = PEFRA;
		else
			sad->nextfra = PSFRA;
	}
	else {
		if (RNA_boolean_get(op->ptr, "end"))
			CFRA = PEFRA;
		else
			CFRA = PSFRA;
		
		sound_seek_scene(bmain, scene);

		WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
	}
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_frame_jump(wmOperatorType *ot)
{
	ot->name = "Jump to Endpoint";
	ot->description = "Jump to first/last frame in frame range";
	ot->idname = "SCREEN_OT_frame_jump";
	
	ot->exec = frame_jump_exec;
	
	ot->poll = ED_operator_screenactive_norender;
	ot->flag = OPTYPE_UNDO;
	
	/* rna */
	RNA_def_boolean(ot->srna, "end", 0, "Last Frame", "Jump to the last frame of the frame range");
}


/* ************** jump to keyframe operator ***************************** */

/* function to be called outside UI context, or for redo */
static int keyframe_jump_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	Object *ob = CTX_data_active_object(C);
	bDopeSheet ads = {NULL};
	DLRBT_Tree keys;
	ActKeyColumn *ak;
	float cfra;
	const bool next = RNA_boolean_get(op->ptr, "next");
	bool done = false;
	
	/* sanity checks */
	if (scene == NULL)
		return OPERATOR_CANCELLED;

	cfra = (float)(CFRA);

	/* init binarytree-list for getting keyframes */
	BLI_dlrbTree_init(&keys);
	
	/* seed up dummy dopesheet context with flags to perform necessary filtering */
	if ((scene->flag & SCE_KEYS_NO_SELONLY) == 0) {
		/* only selected channels are included */
		ads.filterflag |= ADS_FILTER_ONLYSEL;
	}
	
	/* populate tree with keyframe nodes */
	scene_to_keylist(&ads, scene, &keys, NULL);

	if (ob)
		ob_to_keylist(&ads, ob, &keys, NULL);

	{
		Mask *mask = CTX_data_edit_mask(C);
		if (mask) {
			MaskLayer *masklay = BKE_mask_layer_active(mask);
			mask_to_keylist(&ads, masklay, &keys);
		}
	}

	/* build linked-list for searching */
	BLI_dlrbTree_linkedlist_sync(&keys);
	
	/* find matching keyframe in the right direction */
	do {
		if (next)
			ak = (ActKeyColumn *)BLI_dlrbTree_search_next(&keys, compare_ak_cfraPtr, &cfra);
		else
			ak = (ActKeyColumn *)BLI_dlrbTree_search_prev(&keys, compare_ak_cfraPtr, &cfra);
		
		if (ak) {
			if (CFRA != (int)ak->cfra) {
				/* this changes the frame, so set the frame and we're done */
				CFRA = (int)ak->cfra;
				done = true;
			}
			else {
				/* make this the new starting point for the search */
				cfra = ak->cfra;
			}
		}
	} while ((ak != NULL) && (done == false));

	/* free temp stuff */
	BLI_dlrbTree_free(&keys);

	/* any success? */
	if (done == false) {
		BKE_report(op->reports, RPT_INFO, "No more keyframes to jump to in this direction");

		return OPERATOR_CANCELLED;
	}
	else {
		sound_seek_scene(bmain, scene);

		WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);

		return OPERATOR_FINISHED;
	}
}

static void SCREEN_OT_keyframe_jump(wmOperatorType *ot)
{
	ot->name = "Jump to Keyframe";
	ot->description = "Jump to previous/next keyframe";
	ot->idname = "SCREEN_OT_keyframe_jump";
	
	ot->exec = keyframe_jump_exec;
	
	ot->poll = ED_operator_screenactive_norender;
	ot->flag = OPTYPE_UNDO;
	
	/* properties */
	RNA_def_boolean(ot->srna, "next", true, "Next Keyframe", "");
}

/* ************** jump to marker operator ***************************** */

/* function to be called outside UI context, or for redo */
static int marker_jump_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	TimeMarker *marker;
	int closest = CFRA;
	const bool next = RNA_boolean_get(op->ptr, "next");
	bool found = false;

	/* find matching marker in the right direction */
	for (marker = scene->markers.first; marker; marker = marker->next) {
		if (next) {
			if ((marker->frame > CFRA) && (!found || closest > marker->frame)) {
				closest = marker->frame;
				found = true;
			}
		}
		else {
			if ((marker->frame < CFRA) && (!found || closest < marker->frame)) {
				closest = marker->frame;
				found = true;
			}
		}
	}

	/* any success? */
	if (!found) {
		BKE_report(op->reports, RPT_INFO, "No more markers to jump to in this direction");

		return OPERATOR_CANCELLED;
	}
	else {
		CFRA = closest;

		sound_seek_scene(bmain, scene);

		WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);

		return OPERATOR_FINISHED;
	}
}

static void SCREEN_OT_marker_jump(wmOperatorType *ot)
{
	ot->name = "Jump to Marker";
	ot->description = "Jump to previous/next marker";
	ot->idname = "SCREEN_OT_marker_jump";

	ot->exec = marker_jump_exec;

	ot->poll = ED_operator_screenactive_norender;
	ot->flag = OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "next", true, "Next Marker", "");
}

/* ************** switch screen operator ***************************** */

static bool screen_set_is_ok(bScreen *screen, bScreen *screen_prev)
{
	return ((screen->winid == 0)    &&
	        (screen->full == 0)     &&
	        (screen != screen_prev) &&
	        (screen->id.name[2] != '.' || !(U.uiflag & USER_HIDE_DOT)));
}

/* function to be called outside UI context, or for redo */
static int screen_set_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	bScreen *screen = CTX_wm_screen(C);
	bScreen *screen_prev = screen;
	
	ScrArea *sa = CTX_wm_area(C);
	int tot = BLI_countlist(&bmain->screen);
	int delta = RNA_int_get(op->ptr, "delta");
	
	/* temp screens are for userpref or render display */
	if (screen->temp)
		return OPERATOR_CANCELLED;
	
	if (delta == 1) {
		while (tot--) {
			screen = screen->id.next;
			if (screen == NULL) screen = bmain->screen.first;
			if (screen_set_is_ok(screen, screen_prev)) {
				break;
			}
		}
	}
	else if (delta == -1) {
		while (tot--) {
			screen = screen->id.prev;
			if (screen == NULL) screen = bmain->screen.last;
			if (screen_set_is_ok(screen, screen_prev)) {
				break;
			}
		}
	}
	else {
		screen = NULL;
	}
	
	if (screen && screen_prev != screen) {
		/* return to previous state before switching screens */
		if (sa && sa->full) {
			ED_screen_full_restore(C, sa); /* may free 'screen_prev' */
		}
		
		ED_screen_set(C, screen);
		return OPERATOR_FINISHED;
	}
	return OPERATOR_CANCELLED;
}

static void SCREEN_OT_screen_set(wmOperatorType *ot)
{
	ot->name = "Set Screen";
	ot->description = "Cycle through available screens";
	ot->idname = "SCREEN_OT_screen_set";
	
	ot->exec = screen_set_exec;
	ot->poll = ED_operator_screenactive;

	/* rna */
	RNA_def_int(ot->srna, "delta", 0, INT_MIN, INT_MAX, "Delta", "", INT_MIN, INT_MAX);
}

/* ************** screen full-area operator ***************************** */


/* function to be called outside UI context, or for redo */
static int screen_full_area_exec(bContext *C, wmOperator *UNUSED(op))
{
	bScreen *screen = CTX_wm_screen(C);
	ScrArea *sa = NULL;
	
	/* search current screen for 'fullscreen' areas */
	/* prevents restoring info header, when mouse is over it */
	for (sa = screen->areabase.first; sa; sa = sa->next) {
		if (sa->full) break;
	}
	
	if (sa == NULL) sa = CTX_wm_area(C);
	
	ED_screen_full_toggle(C, CTX_wm_window(C), sa);
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_screen_full_area(wmOperatorType *ot)
{
	ot->name = "Toggle Full Screen";
	ot->description = "Toggle display selected area as fullscreen";
	ot->idname = "SCREEN_OT_screen_full_area";
	
	ot->exec = screen_full_area_exec;
	ot->poll = ED_operator_areaactive;
	ot->flag = 0;
	
}



/* ************** join area operator ********************************************** */

/* operator state vars used:  
 * x1, y1     mouse coord in first area, which will disappear
 * x2, y2     mouse coord in 2nd area, which will become joined
 * 
 * functions:
 * 
 * init()   find edge based on state vars 
 * test if the edge divides two areas, 
 * store active and nonactive area,
 * 
 * apply()  do the actual join
 * 
 * exit()	cleanup, send notifier
 * 
 * callbacks:
 * 
 * exec()	calls init, apply, exit 
 * 
 * invoke() sets mouse coords in x,y
 * call init()
 * add modal handler
 * 
 * modal()	accept modal events while doing it
 * call apply() with active window and nonactive window
 * call exit() and remove handler when LMB confirm
 */

typedef struct sAreaJoinData {
	ScrArea *sa1;   /* first area to be considered */
	ScrArea *sa2;   /* second area to be considered */
	ScrArea *scr;   /* designed for removal */

} sAreaJoinData;


/* validate selection inside screen, set variables OK */
/* return 0: init failed */
/* XXX todo: find edge based on (x,y) and set other area? */
static int area_join_init(bContext *C, wmOperator *op)
{
	ScrArea *sa1, *sa2;
	sAreaJoinData *jd = NULL;
	int x1, y1;
	int x2, y2;
	int shared = 0;
	
	/* required properties, make negative to get return 0 if not set by caller */
	x1 = RNA_int_get(op->ptr, "min_x");
	y1 = RNA_int_get(op->ptr, "min_y");
	x2 = RNA_int_get(op->ptr, "max_x");
	y2 = RNA_int_get(op->ptr, "max_y");
	
	sa1 = screen_areahascursor(CTX_wm_screen(C), x1, y1);
	sa2 = screen_areahascursor(CTX_wm_screen(C), x2, y2);
	if (sa1 == NULL || sa2 == NULL || sa1 == sa2)
		return 0;
	
	/* do areas share an edge? */
	if (sa1->v1 == sa2->v1 || sa1->v1 == sa2->v2 || sa1->v1 == sa2->v3 || sa1->v1 == sa2->v4) shared++;
	if (sa1->v2 == sa2->v1 || sa1->v2 == sa2->v2 || sa1->v2 == sa2->v3 || sa1->v2 == sa2->v4) shared++;
	if (sa1->v3 == sa2->v1 || sa1->v3 == sa2->v2 || sa1->v3 == sa2->v3 || sa1->v3 == sa2->v4) shared++;
	if (sa1->v4 == sa2->v1 || sa1->v4 == sa2->v2 || sa1->v4 == sa2->v3 || sa1->v4 == sa2->v4) shared++;
	if (shared != 2) {
		printf("areas don't share edge\n");
		return 0;
	}
	
	jd = (sAreaJoinData *)MEM_callocN(sizeof(sAreaJoinData), "op_area_join");
	
	jd->sa1 = sa1;
	jd->sa1->flag |= AREA_FLAG_DRAWJOINFROM;
	jd->sa2 = sa2;
	jd->sa2->flag |= AREA_FLAG_DRAWJOINTO;
	
	op->customdata = jd;
	
	return 1;
}

/* apply the join of the areas (space types) */
static int area_join_apply(bContext *C, wmOperator *op)
{
	sAreaJoinData *jd = (sAreaJoinData *)op->customdata;
	if (!jd) return 0;
	
	if (!screen_area_join(C, CTX_wm_screen(C), jd->sa1, jd->sa2)) {
		return 0;
	}
	if (CTX_wm_area(C) == jd->sa2) {
		CTX_wm_area_set(C, NULL);
		CTX_wm_region_set(C, NULL);
	}
	
	return 1;
}

/* finish operation */
static void area_join_exit(bContext *C, wmOperator *op)
{
	if (op->customdata) {
		MEM_freeN(op->customdata);
		op->customdata = NULL;
	}
	
	/* this makes sure aligned edges will result in aligned grabbing */
	removedouble_scredges(CTX_wm_screen(C));
	removenotused_scredges(CTX_wm_screen(C));
	removenotused_scrverts(CTX_wm_screen(C));
}

static int area_join_exec(bContext *C, wmOperator *op)
{
	if (!area_join_init(C, op)) 
		return OPERATOR_CANCELLED;
	
	area_join_apply(C, op);
	area_join_exit(C, op);
	
	return OPERATOR_FINISHED;
}

/* interaction callback */
static int area_join_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	
	if (event->type == EVT_ACTIONZONE_AREA) {
		sActionzoneData *sad = event->customdata;
		
		if (sad == NULL || sad->modifier > 0) {
			return OPERATOR_PASS_THROUGH;
		}
		
		/* verify *sad itself */
		if (sad->sa1 == NULL || sad->sa2 == NULL)
			return OPERATOR_PASS_THROUGH;
		
		/* is this our *sad? if areas equal it should be passed on */
		if (sad->sa1 == sad->sa2)
			return OPERATOR_PASS_THROUGH;
		
		/* prepare operator state vars */
		RNA_int_set(op->ptr, "min_x", sad->x);
		RNA_int_set(op->ptr, "min_y", sad->y);
		RNA_int_set(op->ptr, "max_x", event->x);
		RNA_int_set(op->ptr, "max_y", event->y);
	}
	
	
	if (!area_join_init(C, op)) 
		return OPERATOR_PASS_THROUGH;
	
	/* add temp handler */
	WM_event_add_modal_handler(C, op);
	
	return OPERATOR_RUNNING_MODAL;
}

static void area_join_cancel(bContext *C, wmOperator *op)
{
	sAreaJoinData *jd = (sAreaJoinData *)op->customdata;
	
	if (jd->sa1) {
		jd->sa1->flag &= ~AREA_FLAG_DRAWJOINFROM;
		jd->sa1->flag &= ~AREA_FLAG_DRAWJOINTO;
	}
	if (jd->sa2) {
		jd->sa2->flag &= ~AREA_FLAG_DRAWJOINFROM;
		jd->sa2->flag &= ~AREA_FLAG_DRAWJOINTO;
	}
	
	WM_event_add_notifier(C, NC_WINDOW, NULL);
	
	area_join_exit(C, op);
}

/* modal callback while selecting area (space) that will be removed */
static int area_join_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
	bScreen *sc = CTX_wm_screen(C);
	sAreaJoinData *jd = (sAreaJoinData *)op->customdata;
	
	/* execute the events */
	switch (event->type) {
			
		case MOUSEMOVE: 
		{
			ScrArea *sa = screen_areahascursor(sc, event->x, event->y);
			int dir;
			
			if (sa) {
				if (jd->sa1 != sa) {
					dir = area_getorientation(jd->sa1, sa);
					if (dir != -1) {
						if (jd->sa2) jd->sa2->flag &= ~AREA_FLAG_DRAWJOINTO;
						jd->sa2 = sa;
						jd->sa2->flag |= AREA_FLAG_DRAWJOINTO;
					}
					else {
						/* we are not bordering on the previously selected area 
						 * we check if area has common border with the one marked for removal
						 * in this case we can swap areas.
						 */
						dir = area_getorientation(sa, jd->sa2);
						if (dir != -1) {
							if (jd->sa1) jd->sa1->flag &= ~AREA_FLAG_DRAWJOINFROM;
							if (jd->sa2) jd->sa2->flag &= ~AREA_FLAG_DRAWJOINTO;
							jd->sa1 = jd->sa2;
							jd->sa2 = sa;
							if (jd->sa1) jd->sa1->flag |= AREA_FLAG_DRAWJOINFROM;
							if (jd->sa2) jd->sa2->flag |= AREA_FLAG_DRAWJOINTO;
						}
						else {
							if (jd->sa2) jd->sa2->flag &= ~AREA_FLAG_DRAWJOINTO;
							jd->sa2 = NULL;
						}
					}
					WM_event_add_notifier(C, NC_WINDOW, NULL);
				}
				else {
					/* we are back in the area previously selected for keeping 
					 * we swap the areas if possible to allow user to choose */
					if (jd->sa2 != NULL) {
						if (jd->sa1) jd->sa1->flag &= ~AREA_FLAG_DRAWJOINFROM;
						if (jd->sa2) jd->sa2->flag &= ~AREA_FLAG_DRAWJOINTO;
						jd->sa1 = jd->sa2;
						jd->sa2 = sa;
						if (jd->sa1) jd->sa1->flag |= AREA_FLAG_DRAWJOINFROM;
						if (jd->sa2) jd->sa2->flag |= AREA_FLAG_DRAWJOINTO;
						dir = area_getorientation(jd->sa1, jd->sa2);
						if (dir == -1) {
							printf("oops, didn't expect that!\n");
						}
					}
					else {
						dir = area_getorientation(jd->sa1, sa);
						if (dir != -1) {
							if (jd->sa2) jd->sa2->flag &= ~AREA_FLAG_DRAWJOINTO;
							jd->sa2 = sa;
							jd->sa2->flag |= AREA_FLAG_DRAWJOINTO;
						}
					}
					WM_event_add_notifier(C, NC_WINDOW, NULL);
				}
			}
			break;
		}
		case LEFTMOUSE:
			if (event->val == KM_RELEASE) {
				ED_area_tag_redraw(jd->sa1);
				ED_area_tag_redraw(jd->sa2);

				area_join_apply(C, op);
				WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
				area_join_exit(C, op);
				return OPERATOR_FINISHED;
			}
			break;
			
		case RIGHTMOUSE:
		case ESCKEY:
			area_join_cancel(C, op);
			return OPERATOR_CANCELLED;
	}
	
	return OPERATOR_RUNNING_MODAL;
}

/* Operator for joining two areas (space types) */
static void SCREEN_OT_area_join(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Join Area";
	ot->description = "Join selected areas into new window";
	ot->idname = "SCREEN_OT_area_join";
	
	/* api callbacks */
	ot->exec = area_join_exec;
	ot->invoke = area_join_invoke;
	ot->modal = area_join_modal;
	ot->poll = screen_active_editable;
	ot->cancel = area_join_cancel;
	
	/* flags */
	ot->flag = OPTYPE_BLOCKING | OPTYPE_INTERNAL;
	
	/* rna */
	RNA_def_int(ot->srna, "min_x", -100, INT_MIN, INT_MAX, "X 1", "", INT_MIN, INT_MAX);
	RNA_def_int(ot->srna, "min_y", -100, INT_MIN, INT_MAX, "Y 1", "", INT_MIN, INT_MAX);
	RNA_def_int(ot->srna, "max_x", -100, INT_MIN, INT_MAX, "X 2", "", INT_MIN, INT_MAX);
	RNA_def_int(ot->srna, "max_y", -100, INT_MIN, INT_MAX, "Y 2", "", INT_MIN, INT_MAX);
}

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

static int screen_area_options_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
	wmWindow *win = CTX_wm_window(C);
	bScreen *sc = CTX_wm_screen(C);
	uiPopupMenu *pup;
	uiLayout *layout;
	PointerRNA ptr1, ptr2;
	ScrEdge *actedge;
	const int winsize_x = WM_window_pixels_x(win);
	const int winsize_y = WM_window_pixels_y(win);

	actedge = screen_find_active_scredge(sc, winsize_x, winsize_y, event->x, event->y);
	
	if (actedge == NULL) return OPERATOR_CANCELLED;
	
	pup = uiPupMenuBegin(C, RNA_struct_ui_name(op->type->srna), ICON_NONE);
	layout = uiPupMenuLayout(pup);
	
	WM_operator_properties_create(&ptr1, "SCREEN_OT_area_join");
	
	/* mouse cursor on edge, '4' can fail on wide edges... */
	RNA_int_set(&ptr1, "min_x", event->x + 4);
	RNA_int_set(&ptr1, "min_y", event->y + 4);
	RNA_int_set(&ptr1, "max_x", event->x - 4);
	RNA_int_set(&ptr1, "max_y", event->y - 4);
	
	WM_operator_properties_create(&ptr2, "SCREEN_OT_area_split");
	
	/* store initial mouse cursor position */
	RNA_int_set(&ptr2, "mouse_x", event->x);
	RNA_int_set(&ptr2, "mouse_y", event->y);
	
	uiItemFullO(layout, "SCREEN_OT_area_split", NULL, ICON_NONE, ptr2.data, WM_OP_INVOKE_DEFAULT, 0);
	uiItemFullO(layout, "SCREEN_OT_area_join", NULL, ICON_NONE, ptr1.data, WM_OP_INVOKE_DEFAULT, 0);
	
	uiPupMenuEnd(C, pup);
	
	return OPERATOR_CANCELLED;
}

static void SCREEN_OT_area_options(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Area Options";
	ot->description = "Operations for splitting and merging";
	ot->idname = "SCREEN_OT_area_options";
	
	/* api callbacks */
	ot->invoke = screen_area_options_invoke;
	
	ot->poll = ED_operator_screen_mainwinactive;

	/* flags */
	ot->flag = OPTYPE_INTERNAL;
}


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


static int spacedata_cleanup_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	bScreen *screen;
	ScrArea *sa;
	int tot = 0;
	
	for (screen = bmain->screen.first; screen; screen = screen->id.next) {
		for (sa = screen->areabase.first; sa; sa = sa->next) {
			if (sa->spacedata.first != sa->spacedata.last) {
				SpaceLink *sl = sa->spacedata.first;

				BLI_remlink(&sa->spacedata, sl);
				tot += BLI_countlist(&sa->spacedata);
				BKE_spacedata_freelist(&sa->spacedata);
				BLI_addtail(&sa->spacedata, sl);
			}
		}
	}
	BKE_reportf(op->reports, RPT_INFO, "Removed amount of editors: %d", tot);
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_spacedata_cleanup(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Clean-up Space-data";
	ot->description = "Remove unused settings for invisible editors";
	ot->idname = "SCREEN_OT_spacedata_cleanup";
	
	/* api callbacks */
	ot->exec = spacedata_cleanup_exec;
	ot->poll = WM_operator_winactive;
	
}

/* ************** repeat last operator ***************************** */

static int repeat_last_exec(bContext *C, wmOperator *UNUSED(op))
{
	wmOperator *lastop = CTX_wm_manager(C)->operators.last;
	
	if (lastop)
		WM_operator_repeat(C, lastop);
	
	return OPERATOR_CANCELLED;
}

static void SCREEN_OT_repeat_last(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Repeat Last";
	ot->description = "Repeat last action";
	ot->idname = "SCREEN_OT_repeat_last";
	
	/* api callbacks */
	ot->exec = repeat_last_exec;
	
	ot->poll = ED_operator_screenactive;
	
}

static int repeat_history_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
	wmWindowManager *wm = CTX_wm_manager(C);
	wmOperator *lastop;
	uiPopupMenu *pup;
	uiLayout *layout;
	int items, i;
	
	items = BLI_countlist(&wm->operators);
	if (items == 0)
		return OPERATOR_CANCELLED;
	
	pup = uiPupMenuBegin(C, RNA_struct_ui_name(op->type->srna), ICON_NONE);
	layout = uiPupMenuLayout(pup);
	
	for (i = items - 1, lastop = wm->operators.last; lastop; lastop = lastop->prev, i--)
		if (WM_operator_repeat_check(C, lastop))
			uiItemIntO(layout, RNA_struct_ui_name(lastop->type->srna), ICON_NONE, op->type->idname, "index", i);
	
	uiPupMenuEnd(C, pup);
	
	return OPERATOR_CANCELLED;
}

static int repeat_history_exec(bContext *C, wmOperator *op)
{
	wmWindowManager *wm = CTX_wm_manager(C);
	
	op = BLI_findlink(&wm->operators, RNA_int_get(op->ptr, "index"));
	if (op) {
		/* let's put it as last operator in list */
		BLI_remlink(&wm->operators, op);
		BLI_addtail(&wm->operators, op);
		
		WM_operator_repeat(C, op);
	}
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_repeat_history(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Repeat History";
	ot->description = "Display menu for previous actions performed";
	ot->idname = "SCREEN_OT_repeat_history";
	
	/* api callbacks */
	ot->invoke = repeat_history_invoke;
	ot->exec = repeat_history_exec;
	
	ot->poll = ED_operator_screenactive;
	
	RNA_def_int(ot->srna, "index", 0, 0, INT_MAX, "Index", "", 0, 1000);
}

/* ********************** redo operator ***************************** */

static int redo_last_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *UNUSED(event))
{
	wmOperator *lastop = WM_operator_last_redo(C);
	
	if (lastop)
		WM_operator_redo_popup(C, lastop);
	
	return OPERATOR_CANCELLED;
}

static void SCREEN_OT_redo_last(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Redo Last";
	ot->description = "Display menu for last action performed";
	ot->idname = "SCREEN_OT_redo_last";
	
	/* api callbacks */
	ot->invoke = redo_last_invoke;
	
	ot->poll = ED_operator_screenactive;
}

/* ************** region four-split operator ***************************** */

static void view3d_localview_update_rv3d(struct RegionView3D *rv3d)
{
	if (rv3d->localvd) {
		rv3d->localvd->view = rv3d->view;
		rv3d->localvd->persp = rv3d->persp;
		copy_qt_qt(rv3d->localvd->viewquat, rv3d->viewquat);
	}
}

static void region_quadview_init_rv3d(ScrArea *sa, ARegion *ar,
                                      const char viewlock, const char view, const char persp)
{
	RegionView3D *rv3d = ar->regiondata;

	if (persp == RV3D_CAMOB) {
		ED_view3d_lastview_store(rv3d);
	}

	rv3d->viewlock = viewlock;
	rv3d->view = view;
	rv3d->persp = persp;

	ED_view3d_lock(rv3d);
	view3d_localview_update_rv3d(rv3d);
	if ((viewlock & RV3D_BOXCLIP) && (persp == RV3D_ORTHO)) {
		ED_view3d_quadview_update(sa, ar, true);
	}
}

/* insert a region in the area region list */
static int region_quadview_exec(bContext *C, wmOperator *op)
{
	ARegion *ar = CTX_wm_region(C);
	
	/* some rules... */
	if (ar->regiontype != RGN_TYPE_WINDOW) {
		BKE_report(op->reports, RPT_ERROR, "Only window region can be 4-splitted");
	}
	else if (ar->alignment == RGN_ALIGN_QSPLIT) {
		/* Exit quad-view */
		ScrArea *sa = CTX_wm_area(C);
		ARegion *arn;
		
		/* keep current region */
		ar->alignment = 0;
		
		if (sa->spacetype == SPACE_VIEW3D) {
			ARegion *ar_iter;
			RegionView3D *rv3d = ar->regiondata;

			/* if this is a locked view, use settings from 'User' view */
			if (rv3d->viewlock) {
				View3D *v3d_user;
				ARegion *ar_user;

				if (ED_view3d_context_user_region(C, &v3d_user, &ar_user)) {
					if (ar != ar_user) {
						SWAP(void *, ar->regiondata, ar_user->regiondata);
						rv3d = ar->regiondata;
					}
				}
			}

			rv3d->viewlock_quad = RV3D_VIEWLOCK_INIT;
			rv3d->viewlock = 0;
			rv3d->rflag &= ~RV3D_CLIPPING;

			/* accumulate locks, incase they're mixed */
			for (ar_iter = sa->regionbase.first; ar_iter; ar_iter = ar_iter->next) {
				if (ar_iter->regiontype == RGN_TYPE_WINDOW) {
					RegionView3D *rv3d_iter = ar_iter->regiondata;
					rv3d->viewlock_quad |= rv3d_iter->viewlock;
				}
			}
		}
		
		for (ar = sa->regionbase.first; ar; ar = arn) {
			arn = ar->next;
			if (ar->alignment == RGN_ALIGN_QSPLIT) {
				ED_region_exit(C, ar);
				BKE_area_region_free(sa->type, ar);
				BLI_remlink(&sa->regionbase, ar);
				MEM_freeN(ar);
			}
		}
		ED_area_tag_redraw(sa);
		WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
	}
	else if (ar->next) {
		BKE_report(op->reports, RPT_ERROR, "Only last region can be 4-splitted");
	}
	else {
		/* Enter quad-view */
		ScrArea *sa = CTX_wm_area(C);
		ARegion *newar;
		int count;
		
		ar->alignment = RGN_ALIGN_QSPLIT;
		
		for (count = 0; count < 3; count++) {
			newar = BKE_area_region_copy(sa->type, ar);
			BLI_addtail(&sa->regionbase, newar);
		}
		
		/* lock views and set them */
		if (sa->spacetype == SPACE_VIEW3D) {
			View3D *v3d = sa->spacedata.first;
			int index_qsplit = 0;

			/* run ED_view3d_lock() so the correct 'rv3d->viewquat' is set,
			 * otherwise when restoring rv3d->localvd the 'viewquat' won't
			 * match the 'view', set on entering localview See: [#26315],
			 *
			 * We could avoid manipulating rv3d->localvd here if exiting
			 * localview with a 4-split would assign these view locks */
			RegionView3D *rv3d = ar->regiondata;
			const char viewlock = (rv3d->viewlock_quad & RV3D_VIEWLOCK_INIT) ?
			                      (rv3d->viewlock_quad & ~RV3D_VIEWLOCK_INIT) : RV3D_LOCKED;

			region_quadview_init_rv3d(sa, ar,              viewlock, ED_view3d_lock_view_from_index(index_qsplit++), RV3D_ORTHO);
			region_quadview_init_rv3d(sa, (ar = ar->next), viewlock, ED_view3d_lock_view_from_index(index_qsplit++), RV3D_ORTHO);
			region_quadview_init_rv3d(sa, (ar = ar->next), viewlock, ED_view3d_lock_view_from_index(index_qsplit++), RV3D_ORTHO);
			/* forcing camera is distracting */
#if 0
			if (v3d->camera) region_quadview_init_rv3d(sa, (ar = ar->next), 0, RV3D_VIEW_CAMERA, RV3D_CAMOB);
			else             region_quadview_init_rv3d(sa, (ar = ar->next), 0, RV3D_VIEW_USER,   RV3D_PERSP);
#else
			(void)v3d;
#endif
		}
		ED_area_tag_redraw(sa);
		WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
	}
	
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_region_quadview(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Toggle Quad View";
	ot->description = "Split selected area into camera, front, right & top views";
	ot->idname = "SCREEN_OT_region_quadview";
	
	/* api callbacks */
	ot->exec = region_quadview_exec;
	ot->poll = ED_operator_region_view3d_active;
	ot->flag = 0;
}


/* ************** region flip operator ***************************** */

/* flip a region alignment */
static int region_flip_exec(bContext *C, wmOperator *UNUSED(op))
{
	ARegion *ar = CTX_wm_region(C);
	
	if (!ar)
		return OPERATOR_CANCELLED;
	
	if (ar->alignment == RGN_ALIGN_TOP)
		ar->alignment = RGN_ALIGN_BOTTOM;
	else if (ar->alignment == RGN_ALIGN_BOTTOM)
		ar->alignment = RGN_ALIGN_TOP;
	else if (ar->alignment == RGN_ALIGN_LEFT)
		ar->alignment = RGN_ALIGN_RIGHT;
	else if (ar->alignment == RGN_ALIGN_RIGHT)
		ar->alignment = RGN_ALIGN_LEFT;

	ED_area_tag_redraw(CTX_wm_area(C));
	WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
	
	return OPERATOR_FINISHED;
}


static void SCREEN_OT_region_flip(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Flip Region";
	ot->idname = "SCREEN_OT_region_flip";
	ot->description = "Toggle the region's alignment (left/right or top/bottom)";
	
	/* api callbacks */
	ot->exec = region_flip_exec;
	ot->poll = ED_operator_areaactive;
	ot->flag = 0;
}

/* ************** header flip operator ***************************** */

/* flip a header region alignment */
static int header_flip_exec(bContext *C, wmOperator *UNUSED(op))
{
	ARegion *ar = CTX_wm_region(C);
	
	/* find the header region 
	 *	- try context first, but upon failing, search all regions in area...
	 */
	if ((ar == NULL) || (ar->regiontype != RGN_TYPE_HEADER)) {
		ScrArea *sa = CTX_wm_area(C);
		ar = BKE_area_find_region_type(sa, RGN_TYPE_HEADER);

		/* don't do anything if no region */
		if (ar == NULL)
			return OPERATOR_CANCELLED;
	}
	
	/* copied from SCREEN_OT_region_flip */
	if (ar->alignment == RGN_ALIGN_TOP)
		ar->alignment = RGN_ALIGN_BOTTOM;
	else if (ar->alignment == RGN_ALIGN_BOTTOM)
		ar->alignment = RGN_ALIGN_TOP;
	else if (ar->alignment == RGN_ALIGN_LEFT)
		ar->alignment = RGN_ALIGN_RIGHT;
	else if (ar->alignment == RGN_ALIGN_RIGHT)
		ar->alignment = RGN_ALIGN_LEFT;

	ED_area_tag_redraw(CTX_wm_area(C));

	WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);
	
	return OPERATOR_FINISHED;
}


static void SCREEN_OT_header_flip(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Flip Header Region";
	ot->idname = "SCREEN_OT_header_flip";
	ot->description = "Toggle the header over/below the main window area";
	
	/* api callbacks */
	ot->exec = header_flip_exec;
	
	ot->poll = ED_operator_areaactive;
	ot->flag = 0;
}



/* ************** show menus operator ***************************** */

/* show/hide header text menus */
static int header_toggle_menus_exec(bContext *C, wmOperator *UNUSED(op))
{
	ScrArea *sa = CTX_wm_area(C);

	sa->flag = sa->flag ^ HEADER_NO_PULLDOWN;

	ED_area_tag_redraw(sa);
	WM_event_add_notifier(C, NC_SCREEN | NA_EDITED, NULL);	

	return OPERATOR_FINISHED;
}


static void SCREEN_OT_header_toggle_menus(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Expand/Collapse Header Menus";
	ot->idname = "SCREEN_OT_header_toggle_menus";
	ot->description = "Expand or collapse the header pulldown menus";
	
	/* api callbacks */
	ot->exec = header_toggle_menus_exec;
	ot->poll = ED_operator_areaactive;
	ot->flag = 0;
}


/* ************** header tools operator ***************************** */
void ED_screens_header_tools_menu_create(bContext *C, uiLayout *layout, void *UNUSED(arg))
{
	ScrArea *sa = CTX_wm_area(C);
	ARegion *ar = CTX_wm_region(C);

	/* XXX SCREEN_OT_region_flip doesn't work - gets wrong context for active region, so added custom operator. */
	if (ar->alignment == RGN_ALIGN_TOP)
		uiItemO(layout, IFACE_("Flip to Bottom"), ICON_NONE, "SCREEN_OT_header_flip");
	else
		uiItemO(layout, IFACE_("Flip to Top"), ICON_NONE, "SCREEN_OT_header_flip");

	uiItemO(layout, IFACE_("Collapse Menus"),
	        (sa->flag & HEADER_NO_PULLDOWN) ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT,
	        "SCREEN_OT_header_toggle_menus");

	uiItemS(layout);

	/* file browser should be fullscreen all the time, but other regions can be maximized/restored... */
	if (sa->spacetype != SPACE_FILE) {
		if (sa->full) 
			uiItemO(layout, IFACE_("Tile Area"), ICON_NONE, "SCREEN_OT_screen_full_area");
		else
			uiItemO(layout, IFACE_("Maximize Area"), ICON_NONE, "SCREEN_OT_screen_full_area");
	}
}

static int header_toolbox_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *UNUSED(event))
{
	uiPopupMenu *pup;
	uiLayout *layout;

	pup = uiPupMenuBegin(C, IFACE_("Header"), ICON_NONE);
	layout = uiPupMenuLayout(pup);

	ED_screens_header_tools_menu_create(C, layout, NULL);

	uiPupMenuEnd(C, pup);

	return OPERATOR_CANCELLED;
}

static void SCREEN_OT_header_toolbox(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Header Toolbox";
	ot->description = "Display header region toolbox";
	ot->idname = "SCREEN_OT_header_toolbox";
	
	/* api callbacks */
	ot->invoke = header_toolbox_invoke;
}

/* ****************** anim player, with timer ***************** */

static int match_area_with_refresh(int spacetype, int refresh)
{
	switch (spacetype) {
		case SPACE_TIME:
			if (refresh & SPACE_TIME)
				return 1;
			break;
	}
	
	return 0;
}

static int match_region_with_redraws(int spacetype, int regiontype, int redraws)
{
	if (regiontype == RGN_TYPE_WINDOW) {
		
		switch (spacetype) {
			case SPACE_VIEW3D:
				if (redraws & TIME_ALL_3D_WIN)
					return 1;
				break;
			case SPACE_IPO:
			case SPACE_ACTION:
			case SPACE_NLA:
				if (redraws & TIME_ALL_ANIM_WIN)
					return 1;
				break;
			case SPACE_TIME:
				/* if only 1 window or 3d windows, we do timeline too */
				if (redraws & (TIME_ALL_ANIM_WIN | TIME_REGION | TIME_ALL_3D_WIN))
					return 1;
				break;
			case SPACE_BUTS:
				if (redraws & TIME_ALL_BUTS_WIN)
					return 1;
				break;
			case SPACE_SEQ:
				if (redraws & (TIME_SEQ | TIME_ALL_ANIM_WIN))
					return 1;
				break;
			case SPACE_NODE:
				if (redraws & (TIME_NODES))
					return 1;
				break;
			case SPACE_IMAGE:
				if (redraws & TIME_ALL_IMAGE_WIN)
					return 1;
				break;
			case SPACE_CLIP:
				if (redraws & TIME_CLIPS)
					return 1;
				break;
				
		}
	}
	else if (regiontype == RGN_TYPE_CHANNELS) {
		switch (spacetype) {
			case SPACE_IPO:
			case SPACE_ACTION:
			case SPACE_NLA:
				if (redraws & TIME_ALL_ANIM_WIN)
					return 1;
				break;
		}
	}
	else if (regiontype == RGN_TYPE_UI) {
		if (spacetype == SPACE_CLIP) {
			/* Track Preview button is on Properties Editor in SpaceClip,
			 * and it's very common case when users want it be refreshing
			 * during playback, so asking people to enable special option
			 * for this is a bit tricky, so add exception here for refreshing
			 * Properties Editor for SpaceClip always */
			return 1;
		}

		if (redraws & TIME_ALL_BUTS_WIN)
			return 1;
	}
	else if (regiontype == RGN_TYPE_HEADER) {
		if (spacetype == SPACE_TIME)
			return 1;
	}
	else if (regiontype == RGN_TYPE_PREVIEW) {
		switch (spacetype) {
			case SPACE_SEQ:
				if (redraws & (TIME_SEQ | TIME_ALL_ANIM_WIN))
					return 1;
				break;
			case SPACE_CLIP:
				return 1;
		}
	}
	return 0;
}

static int screen_animation_step(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
{
	bScreen *screen = CTX_wm_screen(C);

	if (screen->animtimer && screen->animtimer == event->customdata) {
		Main *bmain = CTX_data_main(C);
		Scene *scene = CTX_data_scene(C);
		wmTimer *wt = screen->animtimer;
		ScreenAnimData *sad = wt->customdata;
		wmWindowManager *wm = CTX_wm_manager(C);
		wmWindow *window;
		ScrArea *sa;
		int sync;
		float time;
		
		/* sync, don't sync, or follow scene setting */
		if (sad->flag & ANIMPLAY_FLAG_SYNC) sync = 1;
		else if (sad->flag & ANIMPLAY_FLAG_NO_SYNC) sync = 0;
		else sync = (scene->flag & SCE_FRAME_DROP);
		
		if ((scene->audio.flag & AUDIO_SYNC) &&
		    (sad->flag & ANIMPLAY_FLAG_REVERSE) == false &&
		    finite(time = sound_sync_scene(scene)))
		{
			scene->r.cfra = (double)time * FPS + 0.5;
		}
		else {
			if (sync) {
				/* note: this is very simplistic,
				 * its has problem that it may skip too many frames.
				 * however at least this gives a less jittery playback */
				const int step = max_ii(1, floor((wt->duration - sad->last_duration) * FPS));

				/* skip frames */
				if (sad->flag & ANIMPLAY_FLAG_REVERSE)
					scene->r.cfra -= step;
				else
					scene->r.cfra += step;
			}
			else {
				/* one frame +/- */
				if (sad->flag & ANIMPLAY_FLAG_REVERSE)
					scene->r.cfra--;
				else
					scene->r.cfra++;
			}
		}
		
		sad->last_duration = wt->duration;

		/* reset 'jumped' flag before checking if we need to jump... */
		sad->flag &= ~ANIMPLAY_FLAG_JUMPED;
		
		if (sad->flag & ANIMPLAY_FLAG_REVERSE) {
			/* jump back to end? */
			if (PRVRANGEON) {
				if (scene->r.cfra < scene->r.psfra) {
					scene->r.cfra = scene->r.pefra;
					sad->flag |= ANIMPLAY_FLAG_JUMPED;
				}
			}
			else {
				if (scene->r.cfra < scene->r.sfra) {
					scene->r.cfra = scene->r.efra;
					sad->flag |= ANIMPLAY_FLAG_JUMPED;
				}
			}
		}
		else {
			/* jump back to start? */
			if (PRVRANGEON) {
				if (scene->r.cfra > scene->r.pefra) {
					scene->r.cfra = scene->r.psfra;
					sad->flag |= ANIMPLAY_FLAG_JUMPED;
				}
			}
			else {
				if (scene->r.cfra > scene->r.efra) {
					scene->r.cfra = scene->r.sfra;
					sad->flag |= ANIMPLAY_FLAG_JUMPED;
				}
			}
		}

		/* next frame overridden by user action (pressed jump to first/last frame) */
		if (sad->flag & ANIMPLAY_FLAG_USE_NEXT_FRAME) {
			scene->r.cfra = sad->nextfra;
			sad->flag &= ~ANIMPLAY_FLAG_USE_NEXT_FRAME;
			sad->flag |= ANIMPLAY_FLAG_JUMPED;
		}
		
		if (sad->flag & ANIMPLAY_FLAG_JUMPED)
			sound_seek_scene(bmain, scene);
		
		/* since we follow drawflags, we can't send notifier but tag regions ourselves */
		ED_update_for_newframe(bmain, scene, 1);

		for (window = wm->windows.first; window; window = window->next) {
			for (sa = window->screen->areabase.first; sa; sa = sa->next) {
				ARegion *ar;
				for (ar = sa->regionbase.first; ar; ar = ar->next) {
					if (ar == sad->ar) {
						ED_region_tag_redraw(ar);
					}
					else if (match_region_with_redraws(sa->spacetype, ar->regiontype, sad->redraws)) {
						ED_region_tag_redraw(ar);
					}
				}
				
				if (match_area_with_refresh(sa->spacetype, sad->refresh))
					ED_area_tag_refresh(sa);
			}
		}
			
		/* update frame rate info too 
		 * NOTE: this may not be accurate enough, since we might need this after modifiers/etc. 
		 * have been calculated instead of just before updates have been done?
		 */
		ED_refresh_viewport_fps(C);
		
		/* recalculate the timestep for the timer now that we've finished calculating this,
		 * since the frames-per-second value may have been changed
		 */
		/* TODO: this may make evaluation a bit slower if the value doesn't change... any way to avoid this? */
		wt->timestep = (1.0 / FPS);
		
		return OPERATOR_FINISHED;
	}
	return OPERATOR_PASS_THROUGH;
}

static void SCREEN_OT_animation_step(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Animation Step";
	ot->description = "Step through animation by position";
	ot->idname = "SCREEN_OT_animation_step";
	
	/* api callbacks */
	ot->invoke = screen_animation_step;
	
	ot->poll = ED_operator_screenactive_norender;
	
}

/* ****************** anim player, starts or ends timer ***************** */

/* find window that owns the animation timer */
bScreen *ED_screen_animation_playing(const wmWindowManager *wm)
{
	wmWindow *window;

	for (window = wm->windows.first; window; window = window->next)
		if (window->screen->animtimer)
			return window->screen;
	
	return NULL;
}

/* toggle operator */
int ED_screen_animation_play(bContext *C, int sync, int mode)
{
	bScreen *screen = CTX_wm_screen(C);
	Scene *scene = CTX_data_scene(C);

	if (ED_screen_animation_playing(CTX_wm_manager(C))) {
		/* stop playback now */
		ED_screen_animation_timer(C, 0, 0, 0, 0);
		sound_stop_scene(scene);
	}
	else {
		int refresh = SPACE_TIME; /* these settings are currently only available from a menu in the TimeLine */
		
		if (mode == 1)  /* XXX only play audio forwards!? */
			sound_play_scene(scene);
		
		ED_screen_animation_timer(C, screen->redraws_flag, refresh, sync, mode);
		
		if (screen->animtimer) {
			wmTimer *wt = screen->animtimer;
			ScreenAnimData *sad = wt->customdata;
			
			sad->ar = CTX_wm_region(C);
		}
	}

	return OPERATOR_FINISHED;
}

static int screen_animation_play_exec(bContext *C, wmOperator *op)
{
	int mode = (RNA_boolean_get(op->ptr, "reverse")) ? -1 : 1;
	int sync = -1;
	
	if (RNA_struct_property_is_set(op->ptr, "sync"))
		sync = (RNA_boolean_get(op->ptr, "sync"));
	
	return ED_screen_animation_play(C, sync, mode);
}

static void SCREEN_OT_animation_play(wmOperatorType *ot)
{
	PropertyRNA *prop;

	/* identifiers */
	ot->name = "Play Animation";
	ot->description = "Play animation";
	ot->idname = "SCREEN_OT_animation_play";
	
	/* api callbacks */
	ot->exec = screen_animation_play_exec;
	
	ot->poll = ED_operator_screenactive_norender;
	
	prop = RNA_def_boolean(ot->srna, "reverse", 0, "Play in Reverse", "Animation is played backwards");
	RNA_def_property_flag(prop, PROP_SKIP_SAVE);
	prop = RNA_def_boolean(ot->srna, "sync", 0, "Sync", "Drop frames to maintain framerate");
	RNA_def_property_flag(prop, PROP_SKIP_SAVE);
}

static int screen_animation_cancel_exec(bContext *C, wmOperator *op)
{
	bScreen *screen = ED_screen_animation_playing(CTX_wm_manager(C));

	if (screen) {
		if (RNA_boolean_get(op->ptr, "restore_frame")) {
			ScreenAnimData *sad = screen->animtimer->customdata;
			Scene *scene = CTX_data_scene(C);

			/* reset current frame before stopping, and just send a notifier to deal with the rest
			 * (since playback still needs to be stopped)
			 */
			scene->r.cfra = sad->sfra;

			WM_event_add_notifier(C, NC_SCENE | ND_FRAME, scene);
		}

		/* call the other "toggling" operator to clean up now */
		ED_screen_animation_play(C, 0, 0);
	}

	return OPERATOR_PASS_THROUGH;
}

static void SCREEN_OT_animation_cancel(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Cancel Animation";
	ot->description = "Cancel animation, returning to the original frame";
	ot->idname = "SCREEN_OT_animation_cancel";
	
	/* api callbacks */
	ot->exec = screen_animation_cancel_exec;
	
	ot->poll = ED_operator_screenactive;

	RNA_def_boolean(ot->srna, "restore_frame", true, "Restore Frame", "Restore the frame when animation was initialized");
}

/* ************** border select operator (template) ***************************** */

/* operator state vars used: (added by default WM callbacks)   
 * xmin, ymin     
 * xmax, ymax     
 * 
 * customdata: the wmGesture pointer
 * 
 * callbacks:
 * 
 * exec()	has to be filled in by user
 * 
 * invoke() default WM function
 * adds modal handler
 * 
 * modal()	default WM function 
 * accept modal events while doing it, calls exec(), handles ESC and border drawing
 * 
 * poll()	has to be filled in by user for context
 */
#if 0
static int border_select_exec(bContext *C, wmOperator *op)
{
	int event_type = RNA_int_get(op->ptr, "event_type");
	
	if (event_type == LEFTMOUSE)
		printf("border select do select\n");
	else if (event_type == RIGHTMOUSE)
		printf("border select deselect\n");
	else 
		printf("border select do something\n");
	
	return 1;
}

static void SCREEN_OT_border_select(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Border Select";
	ot->idname = "SCREEN_OT_border_select";
	
	/* api callbacks */
	ot->exec = border_select_exec;
	ot->invoke = WM_border_select_invoke;
	ot->modal = WM_border_select_modal;
	ot->cancel = WM_border_select_cancel;
	
	ot->poll = ED_operator_areaactive;
	
	/* rna */
	RNA_def_int(ot->srna, "event_type", 0, INT_MIN, INT_MAX, "Event Type", "", INT_MIN, INT_MAX);
	WM_operator_properties_border(ot);
}
#endif

/* *********************** generic fullscreen 'back' button *************** */


static int fullscreen_back_exec(bContext *C, wmOperator *op)
{
	bScreen *screen = CTX_wm_screen(C);
	ScrArea *sa = NULL;
	
	/* search current screen for 'fullscreen' areas */
	for (sa = screen->areabase.first; sa; sa = sa->next) {
		if (sa->full) break;
	}
	if (!sa) {
		BKE_report(op->reports, RPT_ERROR, "No fullscreen areas were found");
		return OPERATOR_CANCELLED;
	}
	
	ED_screen_full_restore(C, sa);
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_back_to_previous(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Back to Previous Screen";
	ot->description = "Revert back to the original screen layout, before fullscreen area overlay";
	ot->idname = "SCREEN_OT_back_to_previous";
	
	/* api callbacks */
	ot->exec = fullscreen_back_exec;
	ot->poll = ED_operator_screenactive;
}

/* *********** show user pref window ****** */

static int userpref_show_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
{
	wmWindow *win = CTX_wm_window(C);
	rcti rect;
	int sizex, sizey;
	
	sizex = 800 * UI_DPI_WINDOW_FAC;
	sizey = 480 * UI_DPI_WINDOW_FAC;
	
	/* some magic to calculate postition */
	/* pixelsize: mouse coords are in U.pixelsize units :/ */
	rect.xmin = (event->x / U.pixelsize) + win->posx - sizex / 2;
	rect.ymin = (event->y / U.pixelsize) + win->posy - sizey / 2;
	rect.xmax = rect.xmin + sizex;
	rect.ymax = rect.ymin + sizey;
	
	/* changes context! */
	WM_window_open_temp(C, &rect, WM_WINDOW_USERPREFS);
	
	return OPERATOR_FINISHED;
}


static void SCREEN_OT_userpref_show(struct wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Show User Preferences";
	ot->description = "Show user preferences";
	ot->idname = "SCREEN_OT_userpref_show";
	
	/* api callbacks */
	ot->invoke = userpref_show_invoke;
	ot->poll = ED_operator_screenactive;
}

/********************* new screen operator *********************/

static int screen_new_exec(bContext *C, wmOperator *UNUSED(op))
{
	wmWindow *win = CTX_wm_window(C);
	bScreen *sc = CTX_wm_screen(C);
	
	sc = ED_screen_duplicate(win, sc);
	WM_event_add_notifier(C, NC_SCREEN | ND_SCREENBROWSE, sc);
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_new(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "New Screen";
	ot->description = "Add a new screen";
	ot->idname = "SCREEN_OT_new";
	
	/* api callbacks */
	ot->exec = screen_new_exec;
	ot->poll = WM_operator_winactive;
}

/********************* delete screen operator *********************/

static int screen_delete_exec(bContext *C, wmOperator *UNUSED(op))
{
	bScreen *sc = CTX_wm_screen(C);
	
	WM_event_add_notifier(C, NC_SCREEN | ND_SCREENDELETE, sc);
	
	return OPERATOR_FINISHED;
}

static void SCREEN_OT_delete(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Delete Screen";
	ot->description = "Delete active screen";
	ot->idname = "SCREEN_OT_delete";
	
	/* api callbacks */
	ot->exec = screen_delete_exec;
}

/********************* new scene operator *********************/

static int scene_new_exec(bContext *C, wmOperator *op)
{
	Scene *newscene, *scene = CTX_data_scene(C);
	Main *bmain = CTX_data_main(C);
	int type = RNA_enum_get(op->ptr, "type");

	if (type == SCE_COPY_NEW) {
		newscene = BKE_scene_add(bmain, DATA_("Scene"));
	}
	else { /* different kinds of copying */
		newscene = BKE_scene_copy(scene, type);

		/* these can't be handled in blenkernel currently, so do them here */
		if (type == SCE_COPY_LINK_DATA) {
			ED_object_single_users(bmain, newscene, false, true);
		}
		else if (type == SCE_COPY_FULL) {
			ED_editors_flush_edits(C, false);
			ED_object_single_users(bmain, newscene, true, true);
		}
	}
	
	ED_screen_set_scene(C, CTX_wm_screen(C), newscene);
	
	WM_event_add_notifier(C, NC_SCENE | ND_SCENEBROWSE, newscene);
	
	return OPERATOR_FINISHED;
}

static void SCENE_OT_new(wmOperatorType *ot)
{
	static EnumPropertyItem type_items[] = {
		{SCE_COPY_NEW, "NEW", 0, "New", "Add new scene"},
		{SCE_COPY_EMPTY, "EMPTY", 0, "Copy Settings", "Make a copy without any objects"},
		{SCE_COPY_LINK_OB, "LINK_OBJECTS", 0, "Link Objects", "Link to the objects from the current scene"},
		{SCE_COPY_LINK_DATA, "LINK_OBJECT_DATA", 0, "Link Object Data", "Copy objects linked to data from the current scene"},
		{SCE_COPY_FULL, "FULL_COPY", 0, "Full Copy", "Make a full copy of the current scene"},
		{0, NULL, 0, NULL, NULL}};
	
	/* identifiers */
	ot->name = "New Scene";
	ot->description = "Add new scene by type";
	ot->idname = "SCENE_OT_new";
	
	/* api callbacks */
	ot->exec = scene_new_exec;
	ot->invoke = WM_menu_invoke;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
	
	/* properties */
	ot->prop = RNA_def_enum(ot->srna, "type", type_items, 0, "Type", "");
}

/********************* delete scene operator *********************/

static int scene_delete_exec(bContext *C, wmOperator *UNUSED(op))
{
	Scene *scene = CTX_data_scene(C);

	ED_screen_delete_scene(C, scene);

	if (G.debug & G_DEBUG)
		printf("scene delete %p\n", scene);

	WM_event_add_notifier(C, NC_SCENE | NA_REMOVED, scene);

	return OPERATOR_FINISHED;
}

static void SCENE_OT_delete(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Delete Scene";
	ot->description = "Delete active scene";
	ot->idname = "SCENE_OT_delete";
	
	/* api callbacks */
	ot->exec = scene_delete_exec;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* ***************** region alpha blending ***************** */

/* implementation note: a disappearing region needs at least 1 last draw with 100% backbuffer
 * texture over it- then triple buffer will clear it entirely.
 * This because flag RGN_HIDDEN is set in end - region doesnt draw at all then */

typedef struct RegionAlphaInfo {
	ScrArea *sa;
	ARegion *ar, *child_ar;	/* other region */
	int hidden;
} RegionAlphaInfo;

#define TIMEOUT		0.2f
#define TIMESTEP	0.04f

float ED_region_blend_factor(ARegion *ar)
{
	/* check parent too */
	if (ar->regiontimer == NULL && (ar->alignment & RGN_SPLIT_PREV) && ar->prev) {
		ar = ar->prev;
	}

	if (ar->regiontimer) {
		RegionAlphaInfo *rgi = ar->regiontimer->customdata;
		float alpha;

		alpha = (float)ar->regiontimer->duration / TIMEOUT;
		/* makes sure the blend out works 100% - without area redraws */
		if (rgi->hidden) alpha = 0.9f - TIMESTEP - alpha;
		
		CLAMP(alpha, 0.0f, 1.0f);
		return alpha;
	}
	return 1.0f;
}

/* assumes region has running region-blend timer */
static void region_blend_end(bContext *C, ARegion *ar, const bool is_running)
{
	RegionAlphaInfo *rgi = ar->regiontimer->customdata;
	
	/* always send redraw */
	ED_region_tag_redraw(ar);
	if (rgi->child_ar)
		ED_region_tag_redraw(rgi->child_ar);
	
	/* if running timer was hiding, the flag toggle went wrong */
	if (is_running) {
		if (rgi->hidden)
			rgi->ar->flag &= ~RGN_FLAG_HIDDEN;
	}
	else {
		if (rgi->hidden) {
			rgi->ar->flag |= rgi->hidden;
			ED_area_initialize(CTX_wm_manager(C), CTX_wm_window(C), rgi->sa);
		}
		/* area decoration needs redraw in end */
		ED_area_tag_redraw(rgi->sa);
	}
	WM_event_remove_timer(CTX_wm_manager(C), NULL, ar->regiontimer); /* frees rgi */
	ar->regiontimer = NULL;

}
/* assumes that *ar itself is not a splitted version from previous region */
void region_blend_start(bContext *C, ScrArea *sa, ARegion *ar)
{
	wmWindowManager *wm = CTX_wm_manager(C);
	wmWindow *win = CTX_wm_window(C);
	RegionAlphaInfo *rgi;
	
	/* end running timer */
	if (ar->regiontimer) {

		region_blend_end(C, ar, true);
	}
	rgi = MEM_callocN(sizeof(RegionAlphaInfo), "RegionAlphaInfo");
	
	rgi->hidden = ar->flag & RGN_FLAG_HIDDEN;
	rgi->sa = sa;
	rgi->ar = ar;
	ar->flag &= ~RGN_FLAG_HIDDEN;

	/* blend in, reinitialize regions because it got unhidden */
	if (rgi->hidden == 0)
		ED_area_initialize(wm, win, sa);
	else
		WM_event_remove_handlers(C, &ar->handlers);

	if (ar->next) {
		if (ar->next->alignment & RGN_SPLIT_PREV) {
			rgi->child_ar = ar->next;
		}
	}

	/* new timer */
	ar->regiontimer = WM_event_add_timer(wm, win, TIMERREGION, TIMESTEP);
	ar->regiontimer->customdata = rgi;

}

/* timer runs in win->handlers, so it cannot use context to find area/region */
static int region_blend_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
{
	RegionAlphaInfo *rgi;
	wmTimer *timer = event->customdata;
	
	/* event type is TIMERREGION, but we better check */
	if (event->type != TIMERREGION || timer == NULL)
		return OPERATOR_PASS_THROUGH;
	
	rgi = timer->customdata;
	
	/* always send redraws */
	ED_region_tag_redraw(rgi->ar);
	if (rgi->child_ar)
		ED_region_tag_redraw(rgi->child_ar);
	
	/* end timer? */
	if (rgi->ar->regiontimer->duration > (double)TIMEOUT) {
		region_blend_end(C, rgi->ar, false);
		return (OPERATOR_FINISHED | OPERATOR_PASS_THROUGH);
	}

	return (OPERATOR_FINISHED | OPERATOR_PASS_THROUGH);
}

static void SCREEN_OT_region_blend(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Region Alpha";
	ot->idname = "SCREEN_OT_region_blend";
	ot->description = "Blend in and out overlapping region";
	
	/* api callbacks */
	ot->invoke = region_blend_invoke;
	
	/* flags */
	ot->flag = OPTYPE_INTERNAL;
	
	/* properties */
}


/* ****************  Assigning operatortypes to global list, adding handlers **************** */


/* called in spacetypes.c */
void ED_operatortypes_screen(void)
{
	/* generic UI stuff */
	WM_operatortype_append(SCREEN_OT_actionzone);
	WM_operatortype_append(SCREEN_OT_repeat_last);
	WM_operatortype_append(SCREEN_OT_repeat_history);
	WM_operatortype_append(SCREEN_OT_redo_last);
	
	/* screen tools */
	WM_operatortype_append(SCREEN_OT_area_move);
	WM_operatortype_append(SCREEN_OT_area_split);
	WM_operatortype_append(SCREEN_OT_area_join);
	WM_operatortype_append(SCREEN_OT_area_options);
	WM_operatortype_append(SCREEN_OT_area_dupli);
	WM_operatortype_append(SCREEN_OT_area_swap);
	WM_operatortype_append(SCREEN_OT_region_quadview);
	WM_operatortype_append(SCREEN_OT_region_scale);
	WM_operatortype_append(SCREEN_OT_region_flip);
	WM_operatortype_append(SCREEN_OT_header_flip);
	WM_operatortype_append(SCREEN_OT_header_toggle_menus);
	WM_operatortype_append(SCREEN_OT_header_toolbox);
	WM_operatortype_append(SCREEN_OT_screen_set);
	WM_operatortype_append(SCREEN_OT_screen_full_area);
	WM_operatortype_append(SCREEN_OT_back_to_previous);
	WM_operatortype_append(SCREEN_OT_spacedata_cleanup);
	WM_operatortype_append(SCREEN_OT_screenshot);
	WM_operatortype_append(SCREEN_OT_screencast);
	WM_operatortype_append(SCREEN_OT_userpref_show);
	WM_operatortype_append(SCREEN_OT_region_blend);
	
	/*frame changes*/
	WM_operatortype_append(SCREEN_OT_frame_offset);
	WM_operatortype_append(SCREEN_OT_frame_jump);
	WM_operatortype_append(SCREEN_OT_keyframe_jump);
	WM_operatortype_append(SCREEN_OT_marker_jump);
	
	WM_operatortype_append(SCREEN_OT_animation_step);
	WM_operatortype_append(SCREEN_OT_animation_play);
	WM_operatortype_append(SCREEN_OT_animation_cancel);
	
	/* new/delete */
	WM_operatortype_append(SCREEN_OT_new);
	WM_operatortype_append(SCREEN_OT_delete);
	WM_operatortype_append(SCENE_OT_new);
	WM_operatortype_append(SCENE_OT_delete);
	
	/* tools shared by more space types */
	WM_operatortype_append(ED_OT_undo);
	WM_operatortype_append(ED_OT_undo_push);
	WM_operatortype_append(ED_OT_redo);
	WM_operatortype_append(ED_OT_undo_history);
	
}

static void keymap_modal_set(wmKeyConfig *keyconf)
{
	static EnumPropertyItem modal_items[] = {
		{KM_MODAL_CANCEL, "CANCEL", 0, "Cancel", ""},
		{KM_MODAL_APPLY, "APPLY", 0, "Apply", ""},
		{KM_MODAL_STEP10, "STEP10", 0, "Steps on", ""},
		{KM_MODAL_STEP10_OFF, "STEP10_OFF", 0, "Steps off", ""},
		{0, NULL, 0, NULL, NULL}};
	wmKeyMap *keymap;
	
	/* Standard Modal keymap ------------------------------------------------ */
	keymap = WM_modalkeymap_add(keyconf, "Standard Modal Map", modal_items);
	
	WM_modalkeymap_add_item(keymap, ESCKEY,    KM_PRESS, KM_ANY, 0, KM_MODAL_CANCEL);
	WM_modalkeymap_add_item(keymap, LEFTMOUSE, KM_ANY, KM_ANY, 0, KM_MODAL_APPLY);
	WM_modalkeymap_add_item(keymap, RETKEY, KM_PRESS, KM_ANY, 0, KM_MODAL_APPLY);
	WM_modalkeymap_add_item(keymap, PADENTER, KM_PRESS, KM_ANY, 0, KM_MODAL_APPLY);
	
	WM_modalkeymap_add_item(keymap, LEFTCTRLKEY, KM_PRESS, KM_ANY, 0, KM_MODAL_STEP10);
	WM_modalkeymap_add_item(keymap, LEFTCTRLKEY, KM_RELEASE, KM_ANY, 0, KM_MODAL_STEP10_OFF);
	
	WM_modalkeymap_assign(keymap, "SCREEN_OT_area_move");
	
}

static int open_file_drop_poll(bContext *UNUSED(C), wmDrag *drag, const wmEvent *UNUSED(event))
{
	if (drag->type == WM_DRAG_PATH) {
		if (drag->icon == ICON_FILE_BLEND)
			return 1;
	}
	return 0;
}

static void open_file_drop_copy(wmDrag *drag, wmDropBox *drop)
{
	/* copy drag path to properties */
	RNA_string_set(drop->ptr, "filepath", drag->path);
	drop->opcontext = WM_OP_EXEC_DEFAULT;
}


/* called in spacetypes.c */
void ED_keymap_screen(wmKeyConfig *keyconf)
{
	ListBase *lb;
	wmKeyMap *keymap;
	wmKeyMapItem *kmi;
	
	/* Screen Editing ------------------------------------------------ */
	keymap = WM_keymap_find(keyconf, "Screen Editing", 0, 0);
	
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_actionzone", LEFTMOUSE, KM_PRESS, 0, 0)->ptr, "modifier", 0);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_actionzone", LEFTMOUSE, KM_PRESS, KM_SHIFT, 0)->ptr, "modifier", 1);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_actionzone", LEFTMOUSE, KM_PRESS, KM_CTRL, 0)->ptr, "modifier", 2);
	
	/* screen tools */
	WM_keymap_verify_item(keymap, "SCREEN_OT_area_split", EVT_ACTIONZONE_AREA, 0, 0, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_area_join", EVT_ACTIONZONE_AREA, 0, 0, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_area_dupli", EVT_ACTIONZONE_AREA, 0, KM_SHIFT, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_area_swap", EVT_ACTIONZONE_AREA, 0, KM_CTRL, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_region_scale", EVT_ACTIONZONE_REGION, 0, 0, 0);
	/* area move after action zones */
	WM_keymap_verify_item(keymap, "SCREEN_OT_area_move", LEFTMOUSE, KM_PRESS, 0, 0);
	
	WM_keymap_verify_item(keymap, "SCREEN_OT_area_options", RIGHTMOUSE, KM_PRESS, 0, 0);
	
	
	/* Header Editing ------------------------------------------------ */
	keymap = WM_keymap_find(keyconf, "Header", 0, 0);
	
	WM_keymap_add_item(keymap, "SCREEN_OT_header_toolbox", RIGHTMOUSE, KM_PRESS, 0, 0);
	
	/* Screen General ------------------------------------------------ */
	keymap = WM_keymap_find(keyconf, "Screen", 0, 0);
	
	/* standard timers */
	WM_keymap_add_item(keymap, "SCREEN_OT_animation_step", TIMER0, KM_ANY, KM_ANY, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_region_blend", TIMERREGION, KM_ANY, KM_ANY, 0);
	
	
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_screen_set", RIGHTARROWKEY, KM_PRESS, KM_CTRL, 0)->ptr, "delta", 1);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_screen_set", LEFTARROWKEY, KM_PRESS, KM_CTRL, 0)->ptr, "delta", -1);
	WM_keymap_add_item(keymap, "SCREEN_OT_screen_full_area", UPARROWKEY, KM_PRESS, KM_CTRL, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_screen_full_area", DOWNARROWKEY, KM_PRESS, KM_CTRL, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_screen_full_area", SPACEKEY, KM_PRESS, KM_SHIFT, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_screenshot", F3KEY, KM_PRESS, KM_CTRL, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_screencast", F3KEY, KM_PRESS, KM_ALT, 0);
	
	/* tests */
	WM_keymap_add_item(keymap, "SCREEN_OT_region_quadview", QKEY, KM_PRESS, KM_CTRL | KM_ALT, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_repeat_history", F3KEY, KM_PRESS, 0, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_repeat_last", RKEY, KM_PRESS, KM_SHIFT, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_region_flip", F5KEY, KM_PRESS, 0, 0);
	WM_keymap_verify_item(keymap, "SCREEN_OT_redo_last", F6KEY, KM_PRESS, 0, 0);
	WM_keymap_verify_item(keymap, "SCRIPT_OT_reload", F8KEY, KM_PRESS, 0, 0);
	
	/* files */
	WM_keymap_add_item(keymap, "FILE_OT_execute", RETKEY, KM_PRESS, 0, 0);
	WM_keymap_add_item(keymap, "FILE_OT_execute", PADENTER, KM_PRESS, 0, 0);
	WM_keymap_add_item(keymap, "FILE_OT_cancel", ESCKEY, KM_PRESS, 0, 0);
	
	/* undo */
#ifdef __APPLE__
	WM_keymap_add_item(keymap, "ED_OT_undo", ZKEY, KM_PRESS, KM_OSKEY, 0);
	WM_keymap_add_item(keymap, "ED_OT_redo", ZKEY, KM_PRESS, KM_SHIFT | KM_OSKEY, 0);
	WM_keymap_add_item(keymap, "ED_OT_undo_history", ZKEY, KM_PRESS, KM_ALT | KM_OSKEY, 0);
#endif
	WM_keymap_add_item(keymap, "ED_OT_undo", ZKEY, KM_PRESS, KM_CTRL, 0);
	WM_keymap_add_item(keymap, "ED_OT_redo", ZKEY, KM_PRESS, KM_SHIFT | KM_CTRL, 0);
	WM_keymap_add_item(keymap, "ED_OT_undo_history", ZKEY, KM_PRESS, KM_ALT | KM_CTRL, 0);
	
	
	/* render */
	kmi = WM_keymap_add_item(keymap, "RENDER_OT_render", F12KEY, KM_PRESS, 0, 0);
	RNA_boolean_set(kmi->ptr, "use_viewport", true);
	kmi = WM_keymap_add_item(keymap, "RENDER_OT_render", F12KEY, KM_PRESS, KM_CTRL, 0);
	RNA_boolean_set(kmi->ptr, "animation", true);
	RNA_boolean_set(kmi->ptr, "use_viewport", true);
	WM_keymap_add_item(keymap, "RENDER_OT_view_cancel", ESCKEY, KM_PRESS, 0, 0);
	WM_keymap_add_item(keymap, "RENDER_OT_view_show", F11KEY, KM_PRESS, 0, 0);
	WM_keymap_add_item(keymap, "RENDER_OT_play_rendered_anim", F11KEY, KM_PRESS, KM_CTRL, 0);
	
	/* user prefs */
#ifdef __APPLE__
	WM_keymap_add_item(keymap, "SCREEN_OT_userpref_show", COMMAKEY, KM_PRESS, KM_OSKEY, 0);
#endif
	WM_keymap_add_item(keymap, "SCREEN_OT_userpref_show", UKEY, KM_PRESS, KM_CTRL | KM_ALT, 0);
	
	
	/* Anim Playback ------------------------------------------------ */
	keymap = WM_keymap_find(keyconf, "Frames", 0, 0);
	
	/* frame offsets */
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_offset", UPARROWKEY, KM_PRESS, KM_SHIFT, 0)->ptr, "delta", 10);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_offset", DOWNARROWKEY, KM_PRESS, KM_SHIFT, 0)->ptr, "delta", -10);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_offset", LEFTARROWKEY, KM_PRESS, 0, 0)->ptr, "delta", -1);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_offset", RIGHTARROWKEY, KM_PRESS, 0, 0)->ptr, "delta", 1);
	
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_offset", WHEELDOWNMOUSE, KM_PRESS, KM_ALT, 0)->ptr, "delta", 1);
	RNA_int_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_offset", WHEELUPMOUSE, KM_PRESS, KM_ALT, 0)->ptr, "delta", -1);
	
	RNA_boolean_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_jump", UPARROWKEY, KM_PRESS, KM_CTRL | KM_SHIFT, 0)->ptr, "end", true);
	RNA_boolean_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_jump", DOWNARROWKEY, KM_PRESS, KM_CTRL | KM_SHIFT, 0)->ptr, "end", false);
	RNA_boolean_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_jump", RIGHTARROWKEY, KM_PRESS, KM_SHIFT, 0)->ptr, "end", true);
	RNA_boolean_set(WM_keymap_add_item(keymap, "SCREEN_OT_frame_jump", LEFTARROWKEY, KM_PRESS, KM_SHIFT, 0)->ptr, "end", false);
	
	kmi = WM_keymap_add_item(keymap, "SCREEN_OT_keyframe_jump", UPARROWKEY, KM_PRESS, 0, 0);
	RNA_boolean_set(kmi->ptr, "next", true);

	kmi = WM_keymap_add_item(keymap, "SCREEN_OT_keyframe_jump", DOWNARROWKEY, KM_PRESS, 0, 0);
	RNA_boolean_set(kmi->ptr, "next", false);
	
	kmi = WM_keymap_add_item(keymap, "SCREEN_OT_keyframe_jump", MEDIALAST, KM_PRESS, 0, 0);
	RNA_boolean_set(kmi->ptr, "next", true);

	kmi = WM_keymap_add_item(keymap, "SCREEN_OT_keyframe_jump", MEDIAFIRST, KM_PRESS, 0, 0);
	RNA_boolean_set(kmi->ptr, "next", false);

	
	/* play (forward and backwards) */
	WM_keymap_add_item(keymap, "SCREEN_OT_animation_play", AKEY, KM_PRESS, KM_ALT, 0);
	RNA_boolean_set(WM_keymap_add_item(keymap, "SCREEN_OT_animation_play", AKEY, KM_PRESS, KM_ALT | KM_SHIFT, 0)->ptr, "reverse", true);
	WM_keymap_add_item(keymap, "SCREEN_OT_animation_cancel", ESCKEY, KM_PRESS, 0, 0);
	
	WM_keymap_add_item(keymap, "SCREEN_OT_animation_play", MEDIAPLAY, KM_PRESS, 0, 0);
	WM_keymap_add_item(keymap, "SCREEN_OT_animation_cancel", MEDIASTOP, KM_PRESS, 0, 0);
	
	/* Alternative keys for animation and sequencer playing */
#if 0 /* XXX: disabled for restoring later... bad implementation */
	keymap = WM_keymap_find(keyconf, "Frames", 0, 0);
	kmi = WM_keymap_add_item(keymap, "SCREEN_OT_animation_play", RIGHTARROWKEY, KM_PRESS, KM_ALT, 0);
	RNA_boolean_set(kmi->ptr, "cycle_speed", true);
	
	kmi = WM_keymap_add_item(keymap, "SCREEN_OT_animation_play", LEFTARROWKEY, KM_PRESS, KM_ALT, 0);
	RNA_boolean_set(kmi->ptr, "reverse", true);
	RNA_boolean_set(kmi->ptr, "cycle_speed", true);
	
	WM_keymap_add_item(keymap, "SCREEN_OT_animation_play", DOWNARROWKEY, KM_PRESS, KM_ALT, 0);
#endif

	/* dropbox for entire window */
	lb = WM_dropboxmap_find("Window", 0, 0);
	WM_dropbox_add(lb, "WM_OT_open_mainfile", open_file_drop_poll, open_file_drop_copy);
	WM_dropbox_add(lb, "UI_OT_drop_color", UI_drop_color_poll, UI_drop_color_copy);

	keymap_modal_set(keyconf);
}

