haiku/src/servers/app/server/RootLayer.cpp

//------------------------------------------------------------------------------
//	Copyright (c) 2001-2003, Haiku, Inc.
//
//	Permission is hereby granted, free of charge, to any person obtaining a
//	copy of this software and associated documentation files (the "Software"),
//	to deal in the Software without restriction, including without limitation
//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
//	and/or sell copies of the Software, and to permit persons to whom the
//	Software is furnished to do so, subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in
//	all copies or substantial portions of the Software.
//
//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//	DEALINGS IN THE SOFTWARE.
//
//	File Name:		RootLayer.cpp
//	Author:			Gabe Yoder <gyoder@stny.rr.com>
//					DarkWyrm <bpmagic@columbus.rr.com>
//					Adi Oanca <adioanca@cotty.iren.ro>
//	Description:	Class used for the top layer of each workspace's Layer tree
//  
//------------------------------------------------------------------------------

#include <stdio.h>
#include <Window.h>
#include <List.h>
#include <Message.h>
#include <Entry.h>
#include <File.h>
#include <PortLink.h>

#include "Globals.h"
#include "RootLayer.h"
#include "Layer.h"
#include "Workspace.h"
#include "ServerScreen.h"
#include "WinBorder.h"
#include "ServerWindow.h"
#include "ServerApp.h"
#include "Desktop.h"
#include "ServerConfig.h"
#include "FMWList.h"
#include "DisplayDriver.h"
#include "ServerProtocol.h"
#include "Decorator.h"

//#define DEBUG_ROOTLAYER

#ifdef DEBUG_ROOTLAYER
	#define STRACE(a) printf a
#else
	#define STRACE(a) /* nothing */
#endif

//#define DISPLAYDRIVER_TEST_HACK

RootLayer::RootLayer(const char *name, int32 workspaceCount, 
		Desktop *desktop, DisplayDriver *driver)
 : Layer(BRect(0,0,0,0), name, 0, B_FOLLOW_ALL, B_WILL_DRAW, driver)
{
	fDesktop = desktop;

	fWinBorderListLength	= 64;
	fWinBorderList2	= (WinBorder**)malloc(fWinBorderListLength * sizeof(WinBorder*));
	fWinBorderList	= (WinBorder**)malloc(fWinBorderListLength * sizeof(WinBorder*));
	fWinBorderCount	= 0;
	fWinBorderIndex	= 0;
	fWsCount		= 0;
	fActiveWksIndex	= 0;
	memset(&fWorkspace[0], 0, sizeof(Workspace*)*32);
	SetWorkspaceCount(workspaceCount);
	SetActiveWorkspace(0L);

	fMovingWindow		= false;
	fResizingWindow		= false;
	fMouseTarget		= NULL;
	fDragMessage		= NULL;
	fScreenShotIndex	= 1;

	fQuiting			= false;

	//NOTE: be careful about this one.
	fRootLayer = this;
	fRows = 0;
	fColumns = 0;

	// TODO: this should eventually be replaced by a method to convert the monitor
	// number to an index in the name, i.e. workspace_settings_1 for screen #1
	ReadWorkspaceData(WORKSPACE_DATA_LIST);

	// TODO: read these 3 from a configuration file.
	fScreenXResolution = 0;
	fScreenYResolution = 0;
	fColorSpace = B_RGB32;

	// easy way to identify this class.
	fClassID = AS_ROOTLAYER_CLASS;
	fHidden	= false;

	fListenPort = find_port(SERVER_INPUT_PORT);
	if (fListenPort == B_NAME_NOT_FOUND)
		return;
	
	// Spawn our working thread
	fThreadID = spawn_thread(WorkingThread, name, B_REAL_TIME_DISPLAY_PRIORITY, this);
}

RootLayer::~RootLayer()
{
	int32		exitValue;
	fQuiting	= true;
	BPortLink	msg(fListenPort, -1);
	msg.StartMessage(B_QUIT_REQUESTED);
	msg.EndMessage();
	msg.Flush();

	wait_for_thread(fThreadID, &exitValue);

	if (fDragMessage)
		delete fDragMessage;

	for (int32 i = 0; i < fWsCount; i++)
	{
		if (fWorkspace[i])
		{
			delete fWorkspace[i];
			fWorkspace[i] = NULL;
		}
	}

	// RootLayer object just uses Screen objects, it is not allowed to delete them.
}

void RootLayer::RunThread()
{
	
	if (fThreadID > 0)
		resume_thread(fThreadID);
	else
		debugger("Can not create any more threads.\n");
}

/*!
	\brief Thread function for handling input messages and calculating visible regions.
	\param data Pointer to the app_server to which the thread belongs
	\return Throwaway value - always 0
*/
int32 RootLayer::WorkingThread(void *data)
{
	int32		code = 0;
	status_t	err = B_OK;
	RootLayer	*oneRootLayer	= (RootLayer*)data;
	BPortLink	messageQueue(-1, oneRootLayer->fListenPort);

	// first make sure we are actualy visible
	oneRootLayer->Lock();
	oneRootLayer->RebuildFullRegion();
	oneRootLayer->invalidate_layer(oneRootLayer, oneRootLayer->Bounds());
	oneRootLayer->Unlock();
	
	STRACE(("info: RootLayer(%s)::WorkingThread listening on port %ld.\n", oneRootLayer->GetName(), oneRootLayer->fListenPort));
	for(;;)
	{
		err = messageQueue.GetNextReply(&code);

		oneRootLayer->Lock();

		if(err < B_OK)
		{
			STRACE(("WorkingThread: messageQueue.GetNextReply failed\n"));
			continue;
		}
		
		switch(code)
		{
			// We don't need to do anything with these two, so just pass them
			// onto the active application. Eventually, we will end up passing 
			// them onto the window which is currently under the cursor.
			case B_MOUSE_DOWN:
			case B_MOUSE_UP:
			case B_MOUSE_MOVED:
			case B_MOUSE_WHEEL_CHANGED:
				oneRootLayer->MouseEventHandler(code, messageQueue);
				break;

			case B_KEY_DOWN:
			case B_KEY_UP:
			case B_UNMAPPED_KEY_DOWN:
			case B_UNMAPPED_KEY_UP:
			case B_MODIFIERS_CHANGED:
				oneRootLayer->KeyboardEventHandler(code, messageQueue);
				break;

			case B_QUIT_REQUESTED:
				exit_thread(0);
				break;

			case AS_ROOTLAYER_SHOW_WINBORDER:
			{
				WinBorder	*winBorder = NULL;
				messageQueue.Read<WinBorder*>(&winBorder);
				oneRootLayer->show_winBorder(winBorder);
				break;
			}
			case AS_ROOTLAYER_HIDE_WINBORDER:
			{
				WinBorder	*winBorder = NULL;
				messageQueue.Read<WinBorder*>(&winBorder);
				oneRootLayer->hide_winBorder(winBorder);
				break;
			}
			case AS_ROOTLAYER_DO_INVALIDATE:
			{
				BRegion		invalidRegion;
				Layer		*layer = NULL;
				messageQueue.Read<Layer*>(&layer);
				messageQueue.ReadRegion(&invalidRegion);
				oneRootLayer->invalidate_layer(layer, invalidRegion);
				break;
			}
			case AS_ROOTLAYER_DO_REDRAW:
			{
				BRegion		redrawRegion;
				Layer		*layer = NULL;
				messageQueue.Read<Layer*>(&layer);
				messageQueue.ReadRegion(&redrawRegion);
				oneRootLayer->redraw_layer(layer, redrawRegion);
				break;
			}
			case AS_ROOTLAYER_LAYER_MOVE:
			{
				Layer		*layer = NULL;
				float		x, y;
				messageQueue.Read<Layer*>(&layer);
				messageQueue.Read<float>(&x);
				messageQueue.Read<float>(&y);
				layer->move_layer(x, y);
				break;
			}
			case AS_ROOTLAYER_LAYER_RESIZE:
			{
				Layer		*layer = NULL;
				float		x, y;
				messageQueue.Read<Layer*>(&layer);
				messageQueue.Read<float>(&x);
				messageQueue.Read<float>(&y);
				layer->resize_layer(x, y);
				break;
			}
			case AS_ROOTLAYER_ADD_TO_SUBSET:
			{
				WinBorder	*winBorder = NULL;
				WinBorder	*toWinBorder = NULL;
				messageQueue.Read<WinBorder*>(&winBorder);
				messageQueue.Read<WinBorder*>(&toWinBorder);
				desktop->AddWinBorderToSubset(winBorder, toWinBorder);
				break;
			}
			default:
				STRACE(("RootLayer(%s)::WorkingThread received unexpected code %lx\n",oneRootLayer->GetName(), code));
				break;
		}

		oneRootLayer->Unlock();

		// if we still have other messages in our queue, but we really want to quit
		if (oneRootLayer->fQuiting)
			break;
	}
	return 0;
}

void RootLayer::GoInvalidate(const Layer *layer, const BRegion &region)
{
	BPortLink	msg(fListenPort, -1);
	msg.StartMessage(AS_ROOTLAYER_DO_INVALIDATE);
	msg.Attach<const Layer*>(layer);
	msg.AttachRegion(region);
	msg.Flush();
}

void RootLayer::invalidate_layer(Layer *layer, const BRegion &region)
{
	// NOTE: our thread (WorkingThread) is locked here.
	STRACE(("RootLayer::invalidate_layer(%s)\n", layer->GetName()));

	if (layer->fParent)
		layer = layer->fParent;

	layer->FullInvalidate(region);
}

status_t RootLayer::EnqueueMessage(BPortLink &message)
{
	message.SetSendPort(fListenPort);
	message.Flush();
	return B_OK;
}

void RootLayer::GoRedraw(const Layer *layer, const BRegion &region)
{
	BPortLink	msg(fListenPort, -1);
	msg.StartMessage(AS_ROOTLAYER_DO_REDRAW);
	msg.Attach<const Layer*>(layer);
	msg.AttachRegion(region);
	msg.Flush();
}

void RootLayer::redraw_layer(Layer *layer, const BRegion &region)
{
	// NOTE: our thread (WorkingThread) is locked here.

	layer->Invalidate(region);
}



void RootLayer::MoveBy(float x, float y)
{
}

void RootLayer::ResizeBy(float x, float y)
{
	// TODO: implement
}

Layer* RootLayer::VirtualTopChild() const
{
	fWinBorderIndex	= fWinBorderCount-1;

	if (fWinBorderIndex < fWinBorderCount && fWinBorderIndex >= 0)
{
		WinBorder *wb = fWinBorderList[fWinBorderIndex];
		fWinBorderIndex--;
//printf("Adi: VTC: %p.\n", wb);
//		return fWinBorderList[fWinBorderIndex--];
		return wb;
}

	return NULL;
}

Layer* RootLayer::VirtualLowerSibling() const
{
	if (fWinBorderIndex < fWinBorderCount && fWinBorderIndex > 0)
{
		WinBorder *wb = fWinBorderList[fWinBorderIndex];
		fWinBorderIndex--;
//printf("Adi: VLS: %p.\n", wb);
		return wb;
//		return fWinBorderList[fWinBorderIndex--];
}

	return NULL;
}

Layer* RootLayer::VirtualUpperSibling() const
{
	if (fWinBorderIndex < fWinBorderCount && fWinBorderIndex > 0)
{
		WinBorder *wb = fWinBorderList[fWinBorderIndex];
		fWinBorderIndex++;
//printf("Adi: VUS: %p.\n", wb);
		return wb;
//		return fWinBorderList[fWinBorderIndex++];
}

	return NULL;
}

Layer* RootLayer::VirtualBottomChild() const
{
	fWinBorderIndex	= 0;

	if (fWinBorderIndex < fWinBorderCount && fWinBorderIndex >= 0)
{
		WinBorder *wb = fWinBorderList[fWinBorderIndex];
		fWinBorderIndex++;
//printf("Adi: VBC: %p.\n", wb);
		return wb;
//		return fWinBorderList[fWinBorderIndex++];
}

	return NULL;
}


void RootLayer::AddWinBorder(WinBorder* winBorder)
{
	if (!winBorder->IsHidden())
	{
		debugger("RootLayer::RemoveWinBorder - winBorder must be hidden\n");
		return;
	}

	// Subset modals also need to have a main window before appearing in workspace list.
	int32 feel = winBorder->Window()->Feel();
	if (feel != B_FLOATING_SUBSET_WINDOW_FEEL && feel != B_MODAL_SUBSET_WINDOW_FEEL)
	{
		uint32		wks = winBorder->Window()->Workspaces();

		// add to current workspace
		if (wks == 0)
		{
			fWorkspace[fActiveWksIndex]->AddWinBorder(winBorder);
		}
		// add to desired workspaces
		else
		{
			for (int32 i = 0; i < fWsCount; i++)
			{
				if (fWorkspace[i] && (wks & (0x00000001UL << i)))
					fWorkspace[i]->AddWinBorder(winBorder);
			}
		}
	}

	// we _DO_NOT_ need to invalidate here. At this point our WinBorder is hidden!

	// set some internals
	winBorder->SetRootLayer(this);
	winBorder->fParent = this;
}

void RootLayer::RemoveWinBorder(WinBorder* winBorder)
{
	// Note: removing a subset window is also permited/performed.

	if (!winBorder->IsHidden())
	{
		debugger("RootLayer::RemoveWinBorder - winBorder must be hidden\n");
		return;
	}

	// security measure: in case of windows whose workspace count is 0(current workspace),
	// we don't know the exact workspaces to remove it from. And how all modal and floating
	// windows have 0 as a workspace index, this action is fully justified.
	for (int32 i = 0; i < fWsCount; i++)
		if (fWorkspace[i])
			fWorkspace[i]->RemoveWinBorder(winBorder);

	// we _DO_NOT_ need to invalidate here. At this point our WinBorder is hidden!

	// set some internals
	winBorder->SetRootLayer(NULL);
	winBorder->fParent = NULL;
}

void RootLayer::AddSubsetWinBorder(WinBorder *winBorder, WinBorder *toWinBorder)
{
	// SUBSET windows _must_ have their workspaceIndex set to 0x0
	if (winBorder->Window()->Workspaces() != 0UL)
	{
		debugger("SUBSET windows _must_ have their workspaceIndex set to 0x0\n");
		return;
	}

	// there is no point in continuing - this subset window won't be shown,
	// from 'toWinBorder's point of view
	if (winBorder->IsHidden() || toWinBorder->IsHidden())
	{
		return;
	}

	bool		invalidate	= false;
	bool		invalid;
	WinBorder	*exFocus = FocusWinBorder();

	// we try to add WinBorders to all workspaces. If they are not needed, nothing will be done.
	// If they are needed, Workspace automaticaly allocates space and inserts them.
	for (int32 i = 0; i < fWsCount; i++)
	{
		invalid		= false;

		if (fWorkspace[i] && fWorkspace[i]->HasWinBorder(toWinBorder))
			invalid = fWorkspace[i]->ShowWinBorder(winBorder, false);

		if (fActiveWksIndex == i)
			invalidate = invalid;
	}

	if (invalidate)
	{
		get_workspace_windows();

		// TODO: should it be improved by calling with region of hidden windows
		//       plus the full regions of new windows???
		invalidate_layer(this, fFull);

		draw_window_tab(exFocus, FocusWinBorder());
	}
}

void RootLayer::RemoveSubsetWinBorder(WinBorder *winBorder, WinBorder *fromWinBorder)
{
	// there is no point in continuing - this subset window is not visible
	// at least not visible from 'fromWinBorder's point of view.
	if (winBorder->IsHidden() || fromWinBorder->IsHidden())
	{
		return;
	}

	bool		invalidate	= false;
	bool		invalid;
	WinBorder	*exFocus = FocusWinBorder();

	// we try to remove from all workspaces. If winBorder is not in there, nothing will be done.
	for (int32 i = 0; i < fWsCount; i++)
	{
		invalid		= false;

		if (fWorkspace[i] && fWorkspace[i]->HasWinBorder(fromWinBorder))
			invalid = fWorkspace[i]->HideWinBorder(winBorder);

		if (fActiveWksIndex == i)
			invalidate = invalid;
	}

	if (invalidate)
	{
		get_workspace_windows();

		// TODO: should it be improved by calling with region of hidden windows
		//       plus the full regions of new windows???
		invalidate_layer(this, fFull);

		draw_window_tab(exFocus, FocusWinBorder());
	}
}


// NOTE: This must be called by RootLayer's thread!!!!
void RootLayer::SetActiveWorkspace(int32 index)
{
	STRACE(("RootLayer(%s)::SetActiveWorkspace(%ld)\n", GetName(), index));
	// we need to lock the window list here so no other window can be created 
	desktop->Lock();

	// if fWorkspace[index] object does not exist, create and add allowed WinBorders
	if (!fWorkspace[index])
	{
		// TODO: we NEED datas from a file!!!
		fWorkspace[index] = new Workspace(index, 0xFF00FF00, RGBColor());

		const BList&	windowList = desktop->WindowList();

		int32			ptrCount = windowList.CountItems();
		WinBorder		**ptrWin = (WinBorder**)windowList.Items();

		for (int32 i = 0; i < ptrCount; i++)
		{
			if (ptrWin[i]->Window()->Workspaces() & (0x00000001UL << index))
			{
				fWorkspace[index]->AddWinBorder(ptrWin[i]);
				if (!ptrWin[i]->IsHidden())
					fWorkspace[index]->ShowWinBorder(ptrWin[i]);
			}
		}
	}

	if (ActiveWorkspace()->Focus())
	{
		BMessage	activateMsg(B_WINDOW_ACTIVATED);
		activateMsg.AddBool("active", false);
//		ActiveWorkspace()->Focus()->layerPtr->Window()->SendMsgToClient(&msg);
	}

	{
		int32		ptrCount;
		WinBorder	**ptrWin = NULL;
		BMessage	activatedMsg(B_WORKSPACE_ACTIVATED);
		activatedMsg.AddInt32("workspace", fActiveWksIndex);
		activatedMsg.AddBool("active", false);

		ActiveWorkspace()->GetWinBorderList((void**&)ptrWin, &ptrCount);
		if (ptrWin)
		{
			for (int32 i = 0; i < ptrCount; i++)
			{
				//ptrWin[i]->Window()->SendMsgToClient(&activatedMsg);
			}
		
			delete ptrWin;
		}
	}

	fActiveWksIndex		= index;

	{
		int32		ptrCount;
		WinBorder	**ptrWin = NULL;
		BMessage	activatedMsg(B_WORKSPACE_ACTIVATED);
		activatedMsg.AddInt32("workspace", fActiveWksIndex);
		activatedMsg.AddBool("active", true);

		ActiveWorkspace()->GetWinBorderList((void**&)ptrWin, &ptrCount);
		if (ptrWin)
		{
			for (int32 i = 0; i < ptrCount; i++)
			{
				//ptrWin[i]->Window()->SendMsgToClient(&activatedMsg);
			}
		
			delete ptrWin;
		}
	}

	if (ActiveWorkspace()->Focus())
	{
		BMessage	activateMsg(B_WINDOW_ACTIVATED);
		activateMsg.AddBool("active", true);
//		ActiveWorkspace()->Focus()->layerPtr->Window()->SendMsgToClient(&msg);
	}

// TODO: if the user is holding/moving a window, *IF* the window *is not*
//       in future active workspace, remove from curent one and place in
//       future active workspace.

	// RootLayer::Invalidate(&RootLayer's fFullVisible)

	desktop->Unlock();
}

void RootLayer::SetWinBorderWorskpaces(WinBorder *winBorder, uint32 newWksIndex)
{
	// you *cannot* set workspaces index for a window other than a normal one!
	// Note: See ServerWindow class.
	if (winBorder->Window()->Feel() != B_NORMAL_WINDOW_FEEL)
		return;

	bool invalidate = false;
	bool invalid;
	uint32		oldWksIndex = winBorder->Window()->Workspaces();

	for (int32 i = 0; i < 32; i++)
	{
		if (fWorkspace[i])
		{
			invalid = false;

			if (oldWksIndex & (0x00000001UL << i) &&
				!(newWksIndex & (0x00000001UL << i)))
			{
				if (!winBorder->IsHidden())
				{
					// a little trick to force Workspace to properly pick the next front.
					winBorder->Hide();
					invalid = fWorkspace[i]->HideWinBorder(winBorder);
					winBorder->Show();
				}
				fWorkspace[i]->RemoveWinBorder(winBorder);
			}
			else
			if (newWksIndex & (0x00000001UL << i) &&
				!(oldWksIndex & (0x00000001UL << i)))
			{
				fWorkspace[i]->AddWinBorder(winBorder);
				if (!winBorder->IsHidden())
					invalid = fWorkspace[i]->ShowWinBorder(winBorder);
			}
			else
			{
				// do nothing. winBorder was, and it's still is a member of this workspace
				// OR, winBorder wasn't and it not be in this workspace
			}

			if (fActiveWksIndex == i)
				invalidate = invalid;
		}
	}

	if (invalidate)
		; // RootLayer::Invalidate(winBorder's full visible)
}

void RootLayer::SetWorkspaceCount(int32 wksCount)
{
	if (wksCount < 1)
		wksCount = 1;
	if (wksCount > 32)
		wksCount = 32;

	for (int32 i = wksCount; i < fWsCount; i++)
	{
		if (fWorkspace[i])
		{
			delete fWorkspace[i];
			fWorkspace[i] = NULL;
		}
	}
	
	fWsCount	= wksCount;
}

void RootLayer::ReadWorkspaceData(const char *path)
{
	BMessage msg, settings;
	BFile file(path,B_READ_ONLY);
	char string[20];
	
	if(file.InitCheck()==B_OK && msg.Unflatten(&file)==B_OK)
	{
		int32 count;
		
		if(msg.FindInt32("workspace_count",&count)!=B_OK)
			count=9;
		
		SetWorkspaceCount(count);
		
		for(int32 i=0; i<count; i++)
		{
			Workspace *ws=(Workspace*)fWorkspace[i];
			if(!ws)
				continue;
			
			sprintf(string,"workspace %ld",i);
			
			if(msg.FindMessage(string,&settings)==B_OK)
			{
				ws->GetSettings(settings);
				settings.MakeEmpty();
			}
			else
				ws->GetDefaultSettings();
		}
	}
	else
	{
		SetWorkspaceCount(9);
		
		for(int32 i=0; i<9; i++)
		{
			Workspace *ws=(Workspace*)fWorkspace[i];
			if(!ws)
				continue;
			
			ws->GetDefaultSettings();
		}
	}
}

void RootLayer::SaveWorkspaceData(const char *path)
{
	BMessage msg,dummy;
	BFile file(path,B_READ_WRITE | B_CREATE_FILE);
	
	if(file.InitCheck()!=B_OK)
	{
		printf("ERROR: Couldn't save workspace data in RootLayer\n");
		return;
	}
	
	char string[20];
	int32 count=fWsCount;

	if(msg.Unflatten(&file)==B_OK)
	{
		// if we were successful in unflattening the file, it means we're
		// going to need to save over the existing data
		for(int32 i=0; i<count; i++)
		{
			sprintf(string,"workspace %ld",i);
			if(msg.FindMessage(string,&dummy)==B_OK)
				msg.RemoveName(string);
		}
	}
		
	for(int32 i=0; i<count; i++)
	{
		sprintf(string,"workspace %ld",i);

		Workspace *ws=(Workspace*)fWorkspace[i];
		
		if(!ws)
		{
			dummy.MakeEmpty();
			ws->PutSettings(&dummy,i);
			msg.AddMessage(string,&dummy);
		}
		else
		{
			// We're not supposed to have this happen, but we'll suck it up, anyway. :P
			Workspace::PutDefaultSettings(&msg,i);
		}
	}
}


void RootLayer::HideWinBorder(WinBorder* winBorder)
{
	BPortLink	msg(fListenPort, -1);
	msg.StartMessage(AS_ROOTLAYER_HIDE_WINBORDER);
	msg.Attach<WinBorder*>(winBorder);
	msg.Flush();
}

void RootLayer::ShowWinBorder(WinBorder* winBorder)
{
	BPortLink	msg(fListenPort, -1);
	msg.StartMessage(AS_ROOTLAYER_SHOW_WINBORDER);
	msg.Attach<WinBorder*>(winBorder);
	msg.Flush();
}

WinBorder* RootLayer::WinBorderAt(const BPoint& pt) const{
	for (int32 i = 0; i < fWinBorderCount; i++)
	{
		if (fWinBorderList[i]->fFullVisible.Contains(pt))
			return fWinBorderList[i];
	}
	return NULL;
}

WinBorder* RootLayer::FocusWinBorder() const
{
	return ActiveWorkspace()->Focus();
}

void RootLayer::SetScreens(Screen *screen[], int32 rows, int32 columns)
{
	// NOTE: All screens *must* have the same resolution
	fScreenPtrList.MakeEmpty();
	BRect	newFrame(0, 0, 0, 0);
	for (int32 i=0; i < rows; i++)
	{
		if (i==0)
		{
			for(int32 j=0; j < columns; j++)
			{
				fScreenPtrList.AddItem(screen[i*rows + j]);
				newFrame.right += screen[i*rows + j]->Resolution().x;
			}
		}
		newFrame.bottom		+= screen[i*rows]->Resolution().y;
	}
	
	newFrame.right	-= 1;
	newFrame.bottom	-= 1;
	
	fFrame = newFrame;
	fRows = rows;
	fColumns = columns;
	fScreenXResolution = (int32)(screen[0]->Resolution().x);
	fScreenYResolution = (int32)(screen[0]->Resolution().y);
}

Screen **RootLayer::Screens()
{
	return (Screen**)fScreenPtrList.Items();
}

bool RootLayer::SetScreenResolution(int32 width, int32 height, uint32 colorspace)
{
	if (fScreenXResolution == width && fScreenYResolution == height &&
		fColorSpace == colorspace)
		return false;
	
	bool accepted = true;
	
	for (int i=0; i < fScreenPtrList.CountItems(); i++)
	{
		Screen *screen;
		screen = static_cast<Screen*>(fScreenPtrList.ItemAt(i));
		
		if ( !(screen->SupportsResolution(BPoint(width, height), colorspace)) )
			accepted = false;
	}
	
	if (accepted)
	{
		for (int i=0; i < fScreenPtrList.CountItems(); i++)
		{
			Screen *screen;
			screen = static_cast<Screen*>(fScreenPtrList.ItemAt(i));
			
			screen->SetResolution(BPoint(width, height), colorspace);
		}
		
		Screen **screens = (Screen**)fScreenPtrList.Items();
		SetScreens(screens, fRows, fColumns);
		
		return true;
	}
	
	return false;
}
//---------------------------------------------------------------------------
//				Workspace related methods
//---------------------------------------------------------------------------

//---------------------------------------------------------------------------
//				Input related methods
//---------------------------------------------------------------------------
inline
void RootLayer::MouseEventHandler(int32 code, BPortLink& msg)
{
	switch(code)
	{
		case B_MOUSE_DOWN:
		{
			// Attached data:
			// 1) int64 - time of mouse click
			// 2) float - x coordinate of mouse click
			// 3) float - y coordinate of mouse click
			// 4) int32 - modifier keys down
			// 5) int32 - buttons down
			// 6) int32 - clicks

			PointerEvent evt;	
			evt.code = B_MOUSE_DOWN;
			msg.Read<int64>(&evt.when);
			msg.Read<float>(&evt.where.x);
			msg.Read<float>(&evt.where.y);
			msg.Read<int32>(&evt.modifiers);
			msg.Read<int32>(&evt.buttons);
			msg.Read<int32>(&evt.clicks);
			
			WinBorder	*target = WinBorderAt(evt.where);
			if (target)
			{
				click_type		action;
				bool			invalidate;
				bool			sendMessage = true;
				WinBorder		*exFocus = FocusWinBorder();

				action			= target->TellWhat(evt);

				if (action == DEC_MOVETOBACK)
					invalidate		= ActiveWorkspace()->MoveToBack(target);
				else
					invalidate		= ActiveWorkspace()->MoveToFront(target);
				
				if (invalidate)
				{
					get_workspace_windows();
					
					// TODO: should it be improved by calling with region of hidden windows
					//       plus the full regions of new windows???
					invalidate_layer(this, fFull);
				}

				draw_window_tab(exFocus, FocusWinBorder());

				if (action == DEC_DRAG)
				{
					fMovingWindow = true;
				}
				else if (action == DEC_RESIZE)
				{
					fResizingWindow = true;
				}
				else
				{
					if (exFocus != FocusWinBorder()
						 && !(target->Window()->Flags() & B_WILL_ACCEPT_FIRST_CLICK))
						sendMessage = false;

					target->MouseDown(evt, sendMessage);
				}

				fMouseTarget = target;
			}

			// We'll need this so that GetMouse can query for which buttons
			// are down.
			fButtons=evt.buttons;

			break;
		}
		case B_MOUSE_UP:
		{
			// Attached data:
			// 1) int64 - time of mouse click
			// 2) float - x coordinate of mouse click
			// 3) float - y coordinate of mouse click
			// 4) int32 - modifier keys down

			PointerEvent evt;	
			evt.code = B_MOUSE_UP;
			msg.Read<int64>(&evt.when);
			msg.Read<float>(&evt.where.x);
			msg.Read<float>(&evt.where.y);
			msg.Read<int32>(&evt.modifiers);

			// currently mouse up goes to the same window which received mouse down
			if (fMouseTarget)
			{
				fMouseTarget->MouseUp(evt);
				fMouseTarget = NULL;
			}

			fMovingWindow	= false;
			fResizingWindow	= false;

			STRACE(("MOUSE UP: at (%f, %f)\n", evt.where.x, evt.where.y));

			break;
		}
		case B_MOUSE_MOVED:
		{
			// Attached data:
			// 1) int64 - time of mouse click
			// 2) float - x coordinate of mouse click
			// 3) float - y coordinate of mouse click
			// 4) int32 - buttons down
			
			PointerEvent evt;	
			evt.code = B_MOUSE_MOVED;
			msg.Read<int64>(&evt.when);
			msg.Read<float>(&evt.where.x);
			msg.Read<float>(&evt.where.y);
			msg.Read<int32>(&evt.buttons);

			GetDisplayDriver()->MoveCursorTo(evt.where.x, evt.where.y);

			if (fMouseTarget)
			{
				BPoint		pt = evt.where;
				pt			-= fLastMousePossition;

				if (fMovingWindow)
				{
					if(fMouseTarget->fDecorator)
						fMouseTarget->fDecorator->MoveBy(pt.x, pt.y);

					fMouseTarget->move_layer(pt.x, pt.y);
				}
				else if (fResizingWindow)
				{
					if(fMouseTarget->fDecorator)
						fMouseTarget->fDecorator->ResizeBy(pt.x, pt.y);

					fMouseTarget->resize_layer(pt.x, pt.y);
				}
				else
				{
					fMouseTarget->MouseMoved(evt);
				}
			}
			else
			{
				WinBorder	*target = WinBorderAt(evt.where);
				if (target)
				{
					target->MouseMoved(evt);
				}
			}

			fLastMousePossition = evt.where;

			break;
		}
		case B_MOUSE_WHEEL_CHANGED:
		{
			// FEATURE: This is a tentative change: mouse wheel messages are always sent to the window
			// under the cursor. It's pretty stupid to send it to the active window unless a particular
			// view has locked focus via SetMouseEventMask
						
			PointerEvent evt;	
			evt.code = B_MOUSE_WHEEL_CHANGED;
			msg.Read<int64>(&evt.when);
			msg.Read<float>(&evt.wheel_delta_x);
			msg.Read<float>(&evt.wheel_delta_y);

			if (FocusWinBorder())
			{
				BPoint		cursorPos = GetDisplayDriver()->GetCursorPosition();
				FocusWinBorder()->MouseWheel(evt, cursorPos);
			}
			break;
		}
		default:
		{
			printf("\nDesktop::MouseEventHandler(): WARNING: unknown message\n\n");
			break;
		}
	}
}

inline
void RootLayer::KeyboardEventHandler(int32 code, BPortLink& msg)
{

	switch(code)
	{
		case B_KEY_DOWN:
		{
			// Attached Data:
			// 1) int64 bigtime_t object of when the message was sent
			// 2) int32 raw key code (scancode)
			// 3) int32 modifier-independent ASCII code for the character
			// 4) int32 repeat count
			// 5) int32 modifiers
			// 6) int8[3] UTF-8 data generated
			// 7) int8 number of bytes to follow containing the 
			//		generated string
			// 8) Character string generated by the keystroke
			// 9) int8[16] state of all keys
			
			bigtime_t time;
			int32 scancode, modifiers;
			int8 utf[3];
			char *string = NULL;
			int8 keystates[16];
			int32 raw_char;
			int32 repeatcount;
			
			*((int32*)utf)=0;
			
			msg.Read<bigtime_t>(&time);
			msg.Read<int32>(&scancode);
			msg.Read<int32>(&raw_char);
			msg.Read<int32>(&repeatcount);
			msg.Read<int32>(&modifiers);
			msg.Read(utf, sizeof(utf));
			msg.ReadString(&string);
			msg.Read(keystates,sizeof(int8)*16);
	
			if(DISPLAYDRIVER==HWDRIVER)
			{
				// Check for workspace change or safe video mode
				if(scancode>0x01 && scancode<0x0e)
				{
					if(scancode==0x0d)
					{
						if(modifiers & (B_LEFT_COMMAND_KEY |
							B_LEFT_CONTROL_KEY | B_LEFT_SHIFT_KEY))
						{
							// TODO: Set to Safe Mode in KeyboardEventHandler:B_KEY_DOWN. (DisplayDriver API change)
							STRACE(("Safe Video Mode invoked - code unimplemented\n"));
							if (string)
								free(string);
							break;
						}
					}
				}
			
				if(modifiers & B_CONTROL_KEY)
				{
					STRACE(("Set Workspace %ld\n",scancode-1));
					
					//TODO: SetWorkspace in KeyboardEventHandler
					//SetWorkspace(scancode-2);
					if (string)
						free(string);
					break;
				}	

				// Tab key
				if(scancode==0x26 && (modifiers & B_CONTROL_KEY))
				{
					//ServerApp *deskbar=app_server->FindApp("application/x-vnd.Be-TSKB");
					//if(deskbar)
					//{
						printf("Send Twitcher message key to Deskbar - unimplmemented\n");
						if (string)
							free(string);
						break;
					//}
				}

				// PrintScreen
				if(scancode==0xe)
				{
					if(GetDisplayDriver())
					{
						char filename[128];
						BEntry entry;
						
						sprintf(filename,"/boot/home/screen%ld.png",fScreenShotIndex);
						entry.SetTo(filename);
						
						while(entry.Exists())
						{
							fScreenShotIndex++;
							sprintf(filename,"/boot/home/screen%ld.png",fScreenShotIndex);
						}
						fScreenShotIndex++;
						GetDisplayDriver()->DumpToFile(filename);
						if (string)
							free(string);
						break;
					}
				}
			}
			else
			{
				// F12
				if(scancode>0x1 && scancode<0xe)
				{
					if(scancode==0xd)
					{
						if(modifiers & (B_LEFT_CONTROL_KEY | B_LEFT_SHIFT_KEY | B_LEFT_OPTION_KEY))
						{
							// TODO: Set to Safe Mode in KeyboardEventHandler:B_KEY_DOWN. (DisplayDriver API change)
							STRACE(("Safe Video Mode invoked - code unimplemented\n"));
							if (string)
								free(string);
							break;
						}
					}
					if(modifiers & (B_LEFT_SHIFT_KEY | B_LEFT_CONTROL_KEY))
					{
						STRACE(("Set Workspace %ld\n",scancode-1));
						//TODO: SetWorkspace in KeyboardEventHandler
						//SetWorkspace(scancode-2);
						if (string)
							free(string);
						break;
					}	
				}
				
				//Tab
				if(scancode==0x26 && (modifiers & B_SHIFT_KEY))
				{
					STRACE(("Twitcher\n"));
					//ServerApp *deskbar=app_server->FindApp("application/x-vnd.Be-TSKB");
					//if(deskbar)
					//{
						printf("Send Twitcher message key to Deskbar - unimplmemented\n");
						if (string)
							free(string);
						break;
					//}
				}

				// Pause/Break
				if(scancode==0x7f)
				{
					if(GetDisplayDriver())
					{
						char filename[128];
						BEntry entry;
						
						sprintf(filename,"/boot/home/screen%ld.png",fScreenShotIndex);
						entry.SetTo(filename);
						
						while(entry.Exists())
						{
							fScreenShotIndex++;
							sprintf(filename,"/boot/home/screen%ld.png",fScreenShotIndex);
						}
						fScreenShotIndex++;

						GetDisplayDriver()->DumpToFile(filename);
						if (string)
							free(string);
						break;
					}
				}
			}
			
			// We got this far, so apparently it's safe to pass to the active
			// window.

			Workspace *ws=ActiveWorkspace();
			
			WinBorder *target=ws->Focus();
			if(target)
			{
				ServerWindow *win=target->Window();
				if(win)
				{
					BMessage keymsg(B_KEY_DOWN);
					keymsg.AddInt64("when",time);
//					keymsg.AddInt32("modifiers",modifiers);
					keymsg.AddInt32("key",scancode);
					if(repeatcount>1)
						keymsg.AddInt32("be:key_repeat",repeatcount);
					keymsg.AddData("states",B_INT8_TYPE,keystates,sizeof(int8)*16);
					for(uint8 i=0;i<4; i++)
					{
						if(utf[i])
							keymsg.AddInt8("byte",utf[i]);
					}
					keymsg.AddString("bytes",string);
//					keymsg.AddInt32("raw_char",raw_char);

					win->SendMessageToClient(&keymsg, B_NULL_TOKEN, true);
				}
			}
			
			if (string)
				free(string);
			break;
		}
		case B_KEY_UP:
		{
			// Attached Data:
			// 1) int64 bigtime_t object of when the message was sent
			// 2) int32 raw key code (scancode)
			// 3) int32 modifier-independent ASCII code for the character
			// 4) int32 modifiers
			// 5) int8[3] UTF-8 data generated
			// 6) int8 number of bytes to follow containing the 
			//		generated string
			// 7) Character string generated by the keystroke
			// 8) int8[16] state of all keys
			
			bigtime_t time;
			int32 scancode, modifiers;
			int8 utf[3];
			char *string = NULL;
			int8 keystates[16];
			int32 raw_char;
			
			*((int32*)utf)=0;
			
			msg.Read<bigtime_t>(&time);
			msg.Read<int32>(&scancode);
			msg.Read<int32>(&raw_char);
			msg.Read<int32>(&modifiers);
			msg.Read(utf, sizeof(utf));
			msg.ReadString(&string);
			msg.Read(keystates,sizeof(int8)*16);
	
			STRACE(("Key Up: 0x%lx\n",scancode));
			
			if(DISPLAYDRIVER==HWDRIVER)
			{
				// Tab key
				if(scancode==0x26 && (modifiers & B_CONTROL_KEY))
				{
					//ServerApp *deskbar=app_server->FindApp("application/x-vnd.Be-TSKB");
					//if(deskbar)
					//{
						printf("Send Twitcher message key to Deskbar - unimplmemented\n");
						break;
					//}
				}
			}
			else
			{
				if(scancode==0x26 && (modifiers & B_LEFT_SHIFT_KEY))
				{
					//ServerApp *deskbar=app_server->FindApp("application/x-vnd.Be-TSKB");
					//if(deskbar)
					//{
						printf("Send Twitcher message key to Deskbar - unimplmemented\n");
						break;
					//}
				}
			}

			// We got this far, so apparently it's safe to pass to the active
			// window.
			
			Workspace *ws=ActiveWorkspace();
			
			WinBorder *target=ws->Focus();
			if(target)
			{
				ServerWindow *win=target->Window();
				if(win)
				{
					BMessage keymsg(B_KEY_UP);
					keymsg.AddInt64("when",time);
					keymsg.AddInt32("key",scancode);
					keymsg.AddInt32("modifiers",modifiers);
					keymsg.AddData("states",B_INT8_TYPE,keystates,sizeof(int8)*16);
					for(uint8 i=0;i<4; i++)
					{
						if(utf[i])
							keymsg.AddInt8("byte",utf[i]);
					}
					keymsg.AddString("bytes",string);
					keymsg.AddInt32("raw_char",raw_char);

					win->SendMessageToClient(&keymsg, B_NULL_TOKEN, true);
				}
			}
			
			if (string)
				free(string);
			break;
		}
		case B_UNMAPPED_KEY_DOWN:
		{
			// Attached Data:
			// 1) int64 bigtime_t object of when the message was sent
			// 2) int32 raw key code (scancode)
			// 3) int32 modifiers
			// 4) int8 state of all keys

			bigtime_t time;
			int32 scancode, modifiers;
			int8 keystates[16];
			
			msg.Read<bigtime_t>(&time);
			msg.Read<int32>(&scancode);
			msg.Read<int32>(&modifiers);
			msg.Read(keystates,sizeof(int8)*16);
	
			STRACE(("Unmapped Key Down: 0x%lx\n",scancode));
			
			Workspace *ws=ActiveWorkspace();
			
			WinBorder *target=ws->Focus();
			if(target)
			{
				ServerWindow *win=target->Window();
				if(win)
				{
					BMessage keymsg(B_UNMAPPED_KEY_DOWN);
					keymsg.AddInt64("when",time);
					keymsg.AddInt32("key",scancode);
					keymsg.AddInt32("modifiers",modifiers);
					keymsg.AddData("states",B_INT8_TYPE,keystates,sizeof(int8)*16);
					
					win->SendMessageToClient(&keymsg);
				}
			}
			
			break;
		}
		case B_UNMAPPED_KEY_UP:
		{
			// Attached Data:
			// 1) int64 bigtime_t object of when the message was sent
			// 2) int32 raw key code (scancode)
			// 3) int32 modifiers
			// 4) int8 state of all keys

			bigtime_t time;
			int32 scancode, modifiers;
			int8 keystates[16];
			
			msg.Read<bigtime_t>(&time);
			msg.Read<int32>(&scancode);
			msg.Read<int32>(&modifiers);
			msg.Read(keystates,sizeof(int8)*16);
	
			STRACE(("Unmapped Key Up: 0x%lx\n",scancode));
			
			Workspace *ws=ActiveWorkspace();
			
			WinBorder *target=ws->Focus();
			if(target)
			{
				ServerWindow *win=target->Window();
				if(win)
				{
					BMessage keymsg(B_UNMAPPED_KEY_UP);
					keymsg.AddInt64("when",time);
					keymsg.AddInt32("key",scancode);
					keymsg.AddInt32("modifiers",modifiers);
					keymsg.AddData("states",B_INT8_TYPE,keystates,sizeof(int8)*16);
					
					win->SendMessageToClient(&keymsg);
				}
			}
			
			break;
		}
		case B_MODIFIERS_CHANGED:
		{
			// Attached Data:
			// 1) int64 bigtime_t object of when the message was sent
			// 2) int32 modifiers
			// 3) int32 old modifiers
			// 4) int8 state of all keys
			
			bigtime_t time;
			int32 modifiers,oldmodifiers;
			int8 keystates[16];
			
			msg.Read<bigtime_t>(&time);
			msg.Read<int32>(&modifiers);
			msg.Read<int32>(&oldmodifiers);
			msg.Read(keystates,sizeof(int8)*16);

			Workspace *ws=ActiveWorkspace();
			
			WinBorder *target=ws->Focus();
			if(target)
			{
				ServerWindow *win=target->Window();
				if(win)
				{
					BMessage keymsg(B_MODIFIERS_CHANGED);
					keymsg.AddInt64("when",time);
					keymsg.AddInt32("modifiers",modifiers);
					keymsg.AddInt32("be:old_modifiers",oldmodifiers);
					keymsg.AddData("states",B_INT8_TYPE,keystates,sizeof(int8)*16);
					
					win->SendMessageToClient(&keymsg);
				}
			}

			break;
		}
		default:
			break;
	}
}

void RootLayer::SetDragMessage(BMessage* msg)
{
	if (fDragMessage)
	{
		delete fDragMessage;
		fDragMessage = NULL;
	}

	if (msg)
		fDragMessage	= new BMessage(*msg);
}

BMessage* RootLayer::DragMessage(void) const
{
	return fDragMessage;
}

// DEBUG methods

void RootLayer::PrintToStream()
{
	printf("\nRootLayer '%s' internals:\n", GetName());
	printf("Screen list:\n");
	for(int32 i=0; i<fScreenPtrList.CountItems(); i++)
		printf("\t%ld\n", ((Screen*)fScreenPtrList.ItemAt(i))->ScreenNumber());

	printf("Screen rows: %ld\nScreen columns: %ld\n", fRows, fColumns);
	printf("Resolution for all Screens: %ldx%ldx%ld\n", fScreenXResolution, fScreenYResolution, fColorSpace);
	printf("Workspace list:\n");
	for(int32 i=0; i<fWsCount; i++)
	{
		printf("\t~~~Workspace: %ld\n", ((Workspace*)fWorkspace[i])->ID());
		((Workspace*)fWorkspace[i])->PrintToStream();
		printf("~~~~~~~~\n");
	}
}

// PRIVATE methods

void RootLayer::show_winBorder(WinBorder *winBorder)
{
	bool	invalidate = false;
	bool	invalid;
	WinBorder	*exFocus = FocusWinBorder();

	winBorder->Show(false);

	for (int32 i = 0; i < fWsCount; i++)
	{
		invalid		= false;

		if (fWorkspace[i] &&
				(fWorkspace[i]->HasWinBorder(winBorder) ||
				// floating windows are inserted/removed on-the-fly so this window,
				// although needed may not be in workspace's list.
				winBorder->Level() == B_FLOATING_APP))
		{
			invalid = fWorkspace[i]->ShowWinBorder(winBorder);
		}

		if (fActiveWksIndex == i)
			invalidate = invalid;
	}

	if (invalidate)
	{
		get_workspace_windows();

		// TODO: should it be improved by calling with region of hidden windows
		//       plus the full regions of new windows???
		invalidate_layer(this, fFull);

		draw_window_tab(exFocus, FocusWinBorder());
	}
}

void RootLayer::hide_winBorder(WinBorder *winBorder)
{
	bool		invalidate = false;
	bool		invalid;
	WinBorder	*exFocus = FocusWinBorder();

	winBorder->Hide(false);

	for (int32 i = 0; i < fWsCount; i++)
	{
		invalid		= false;

		if (fWorkspace[i] && fWorkspace[i]->HasWinBorder(winBorder))
			invalid = fWorkspace[i]->HideWinBorder(winBorder);

		if (fActiveWksIndex == i)
			invalidate = invalid;
	}

	if (invalidate)
	{
		get_workspace_windows();

		// TODO: should it be improved by calling with region of hidden windows
		//       plus the full regions of new windows???
		invalidate_layer(this, fFull);

		draw_window_tab(exFocus, FocusWinBorder());
	}
}

void RootLayer::get_workspace_windows()
{
	int32	bufferSize = fWinBorderListLength;
	int32	exCount = fWinBorderCount;
	bool	present;
	bool	newMemory = false;

	memcpy(fWinBorderList2, fWinBorderList, fWinBorderCount * sizeof(WinBorder*));

	if (!(ActiveWorkspace()->GetWinBorderList((void**)fWinBorderList, &bufferSize)))
	{
		newMemory		= true;
		// grow by a factor of 8.
		fWinBorderListLength = (bufferSize / 8 + 1) * 8;
		fWinBorderList	= (WinBorder**)realloc(fWinBorderList, fWinBorderListLength);
		ActiveWorkspace()->GetWinBorderList((void**)fWinBorderList, &bufferSize);
	}
	
	fWinBorderCount = bufferSize;

	fWinBorderIndex	= 0;

	// clear visible and full visible regions for windows no more visible.
	for (int32 i = 0; i < exCount; i++)
	{
		present	= false;

		for (int32 j = 0; j < fWinBorderCount; j++)
			if (fWinBorderList2[i] == fWinBorderList[j])
				present = true;

		if (!present)
			empty_visible_regions(fWinBorderList2[i]);
//		{
//			fWinBorderList2[i]->fVisible.MakeEmpty();
//			fWinBorderList2[i]->fFullVisible.MakeEmpty();
//		}
	}

	// enlarge 2nd buffer also
	if (newMemory)
		fWinBorderList2	= (WinBorder**)realloc(fWinBorderList2, fWinBorderListLength);

//for (int32 i = 0; i < fWinBorderCount; i++)
//{
//	printf("Adi: %ld get_workspace_windows(%p)\n", i, fWinBorderList[i]);
//}
//printf("Adi: get_workspace_windows DONE\n");
}

void RootLayer::draw_window_tab(WinBorder *exFocus, WinBorder *focus)
{
	if (exFocus || focus)
	{
		if (exFocus && exFocus != focus && exFocus->fDecorator)
			exFocus->fDecorator->SetFocus(false);
		if (focus && exFocus != focus && focus->fDecorator)
			focus->fDecorator->SetFocus(true);

		if (exFocus && focus != exFocus)
		{
			// TODO: this line is a hack, decorator is drawn twice.
			BRegion		reg(exFocus->fVisible);
			if (focus)
				reg.Include(&focus->fVisible);
			redraw_layer(this, reg);
		}
	}
}

inline
void RootLayer::empty_visible_regions(Layer *layer)
{
// TODO: optimize by avoiding recursion?
	// NOTE: first 'layer' must be a WinBorder
	Layer	*child;

	layer->fFullVisible.MakeEmpty();
	layer->fVisible.MakeEmpty();

	child	= layer->VirtualBottomChild();
	while(child)
	{
		empty_visible_regions(child);
		child = layer->VirtualUpperSibling();
	}
}