Mozilla/mozilla/widget/src/mac/nsWindow.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */


// ***IMPORTANT***
// On all platforms, we are assuming in places that the implementation of |nsIWidget|
// is really |nsWindow| and then calling methods specific to nsWindow to finish the job.
// This is by design and the assumption is safe because an nsIWidget can only be created through
// our Widget factory where all our widgets, including the XP widgets, inherit from nsWindow.
// Still, in the places (or most of them) where this assumption is done, a |static_cast| has been used.
// A similar warning is in nsWidgetFactory.cpp.


#include "nsWindow.h"
#include "nsIFontMetrics.h"
#include "nsIDeviceContext.h"
#include "nsCOMPtr.h"
#include "nsToolkit.h"
#include "nsIEnumerator.h"
#include <Appearance.h>

#include "nsplugindefs.h"
#include "nsMacEventHandler.h"


//-------------------------------------------------------------------------
//
// nsWindow constructor
//
//-------------------------------------------------------------------------
nsWindow::nsWindow() : nsBaseWidget() , nsDeleteObserved(this)
{
  strcpy(gInstanceClassName, "nsWindow");

  mParent = nsnull;
  mBounds.SetRect(0,0,0,0);

  mResizingChildren = PR_FALSE;
  mVisible = PR_FALSE;
  mEnabled = PR_TRUE;
	SetPreferredSize(0,0);

	mFontMetrics = nsnull;
	mMenuBar = nsnull;
	mTempRenderingContext = nsnull;

  mWindowRegion = nsnull;
  mVisRegion = nsnull;
  mWindowPtr = nsnull;
  mDrawing = PR_FALSE;
	mDestroyCalled = PR_FALSE;
	mDestructorCalled = PR_FALSE;

	SetBackgroundColor(NS_RGB(255, 255, 255));
	SetForegroundColor(NS_RGB(0, 0, 0));
	
	mPluginPort = nsnull;
}


//-------------------------------------------------------------------------
//
// nsWindow destructor
//
//-------------------------------------------------------------------------
nsWindow::~nsWindow()
{
	mDestructorCalled = PR_TRUE;

	//Destroy();

	if (mWindowRegion)
	{
		::DisposeRgn(mWindowRegion);
		mWindowRegion = nsnull;	
	}

	if (mVisRegion)
	{
		::DisposeRgn(mVisRegion);
		mVisRegion = nsnull;	
	}
			
	NS_IF_RELEASE(mTempRenderingContext);
	
	NS_IF_RELEASE(mMenuBar);
	NS_IF_RELEASE(mMenuListener);
	
	if (mPluginPort) {
		delete mPluginPort;
	}
}


//-------------------------------------------------------------------------
//
// Utility method for implementing both Create(nsIWidget ...) and
// Create(nsNativeWidget...)
//-------------------------------------------------------------------------

nsresult nsWindow::StandardCreate(nsIWidget *aParent,
                      const nsRect &aRect,
                      EVENT_CALLBACK aHandleEventFunction,
                      nsIDeviceContext *aContext,
                      nsIAppShell *aAppShell,
                      nsIToolkit *aToolkit,
                      nsWidgetInitData *aInitData,
                      nsNativeWidget aNativeParent)	// should always be nil here
{
	mParent = aParent;
	mBounds = aRect;
	CalcWindowRegions();

	BaseCreate(aParent, aRect, aHandleEventFunction, 
							aContext, aAppShell, aToolkit, aInitData);

	if (mParent)
	{
		SetBackgroundColor(mParent->GetBackgroundColor());
		SetForegroundColor(mParent->GetForegroundColor());
	}

	if (mWindowPtr == nsnull) {
		if (aParent)
			mWindowPtr = (WindowPtr)aParent->GetNativeData(NS_NATIVE_DISPLAY);
		else if (aAppShell)
			mWindowPtr = (WindowPtr)aAppShell->GetNativeData(NS_NATIVE_SHELL);
	}
	return NS_OK;
}

//-------------------------------------------------------------------------
//
// create a nswindow
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Create(nsIWidget *aParent,
                      const nsRect &aRect,
                      EVENT_CALLBACK aHandleEventFunction,
                      nsIDeviceContext *aContext,
                      nsIAppShell *aAppShell,
                      nsIToolkit *aToolkit,
                      nsWidgetInitData *aInitData)
{	 
	return(StandardCreate(aParent, aRect, aHandleEventFunction,
													aContext, aAppShell, aToolkit, aInitData,
														nsnull));
}

//-------------------------------------------------------------------------
//
// Creates a main nsWindow using a native widget
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Create(nsNativeWidget aNativeParent,		// this is a nsWindow*
                      const nsRect &aRect,
                      EVENT_CALLBACK aHandleEventFunction,
                      nsIDeviceContext *aContext,
                      nsIAppShell *aAppShell,
                      nsIToolkit *aToolkit,
                      nsWidgetInitData *aInitData)
{
	// On Mac, a native widget is a nsWindow* because 
	// nsWindow::GetNativeData(NS_NATIVE_WIDGET) returns 'this'
	nsIWidget* aParent = (nsIWidget*)aNativeParent;
	
	return(Create(aParent, aRect, aHandleEventFunction,
									aContext, aAppShell, aToolkit, aInitData));
}

//-------------------------------------------------------------------------
//
// Close this nsWindow
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Destroy()
{
	if (mDestroyCalled)
		return NS_OK;
	mDestroyCalled = PR_TRUE;

	nsBaseWidget::OnDestroy();
	nsBaseWidget::Destroy();
	
	NS_IF_RELEASE(mMenuBar);
	SetMenuBar(nsnull);

	ReportDestroyEvent();	// beard: this seems to cause the window to be deleted. moved all release code to destructor.

	return NS_OK;
}

#pragma mark -
//-------------------------------------------------------------------------
//
// Get this nsWindow parent
//
//-------------------------------------------------------------------------
nsIWidget* nsWindow::GetParent(void)
{
  NS_IF_ADDREF(mParent);
  return  mParent;
}

//-------------------------------------------------------------------------
//
// Return some native data according to aDataType
//
//-------------------------------------------------------------------------
void* nsWindow::GetNativeData(PRUint32 aDataType)
{
	nsPoint		point;
	void*		retVal = nsnull;

  switch (aDataType) 
	{
	case NS_NATIVE_WIDGET:
    case NS_NATIVE_WINDOW:
    	retVal = (void*)this;
    	break;

    case NS_NATIVE_GRAPHIC:
    case NS_NATIVE_DISPLAY:
      retVal = (void*)mWindowPtr;
    	break;

    case NS_NATIVE_REGION:
//   	retVal = (void*)mWindowRegion;
    	retVal = (void*)mVisRegion;
    	break;

    case NS_NATIVE_COLORMAP:
    	//<2F>TODO
    	break;

    case NS_NATIVE_OFFSETX:
    	point.MoveTo(mBounds.x, mBounds.y);
    	LocalToWindowCoordinate(point);
    	retVal = (void*)point.x;
     	break;

    case NS_NATIVE_OFFSETY:
    	point.MoveTo(mBounds.x, mBounds.y);
    	LocalToWindowCoordinate(point);
    	retVal = (void*)point.y;
    	break;
    
    case NS_NATIVE_PLUGIN_PORT:
    	// this needs to be a combination of the port and the offsets.
    	if (mPluginPort == nsnull)
    		mPluginPort = new nsPluginPort;
    		
		point.MoveTo(mBounds.x, mBounds.y);
		LocalToWindowCoordinate(point);

		// for compatibility with 4.X, this origin is what you'd pass
		// to SetOrigin.
		mPluginPort->port = CGrafPtr(mWindowPtr);
		mPluginPort->portx = -point.x;
		mPluginPort->porty = -point.y;
		
    	retVal = (void*)mPluginPort;
	}

  return retVal;
}

#pragma mark -
//-------------------------------------------------------------------------
//
// Return PR_TRUE if the whether the component is visible, PR_FALSE otherwise
//
//-------------------------------------------------------------------------
NS_METHOD nsWindow::IsVisible(PRBool & bState)
{
  bState = mVisible;
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Hide or show this component
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Show(PRBool bState)
{
  mVisible = bState;
  return NS_OK;
}

    
//-------------------------------------------------------------------------
//
// Enable/disable this component
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Enable(PRBool bState)
{
	mEnabled = bState;
	return NS_OK;
}

    
//-------------------------------------------------------------------------
//
// Set the focus on this component
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::SetFocus(void)
{
	if (mToolkit)
		((nsToolkit*)mToolkit)->SetFocus(this);
	return NS_OK;
}

//-------------------------------------------------------------------------
//
// Get this component font
//
//-------------------------------------------------------------------------
nsIFontMetrics* nsWindow::GetFont(void)
{
	return mFontMetrics;
}

    
//-------------------------------------------------------------------------
//
// Set this component font
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::SetFont(const nsFont &aFont)
{
	NS_IF_RELEASE(mFontMetrics);
	if (mContext)
		mContext->GetMetricsFor(aFont, mFontMetrics);
 	return NS_OK;
}


//-------------------------------------------------------------------------
//
// Set the colormap of the window
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::SetColorMap(nsColorMap *aColorMap)
{
	//<2F>TODO
	// We may need to move this to nsMacWindow:
	// I'm not sure all the individual widgets
	// can have each their own colorMap on Mac.
	return NS_OK;
}

//-------------------------------------------------------------------------
//
// Set the widget's MenuBar.
// Must be called after Create.
// Releases a previously set nsIMenuBar
// AddRefs the passed in nsIMenuBar
// @param aMenuBar a pointer to an nsIMenuBar interface on an object
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::SetMenuBar(nsIMenuBar * aMenuBar)
{
  if (mMenuBar)
    mMenuBar->SetParent(nsnull);
  NS_IF_RELEASE(mMenuBar);
  NS_IF_ADDREF(aMenuBar);
  mMenuBar = aMenuBar;
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Get the widget's MenuBar.
//
//-------------------------------------------------------------------------
nsIMenuBar* nsWindow::GetMenuBar()
{
  return mMenuBar;
}


//
// SetCursor
//
// Override to set the cursor on the mac
//
NS_METHOD nsWindow::SetCursor(nsCursor aCursor)
{
  nsBaseWidget::SetCursor(aCursor);
	
  // mac specific cursor manipulation
	//<2F>TODO: We need a way to get non-os cursors here.
	if (nsToolkit::HasAppearanceManager())
	{
		short cursor = -1;
	  switch (aCursor)
	  {
	    case eCursor_standard:	cursor = kThemeArrowCursor;		break;
	    case eCursor_wait:			cursor = kThemeWatchCursor;		break;
	    case eCursor_select:		cursor = kThemeIBeamCursor;		break;
	    case eCursor_hyperlink:	cursor = kThemePointingHandCursor;		break;
			case eCursor_sizeWE:		cursor = kThemeResizeLeftRightCursor;	break;
			case eCursor_sizeNS:		cursor = kThemeResizeLeftRightCursor;	break;	//<2F>TODO: bad id
	  }
	  if (cursor >= 0)
	  	::SetThemeCursor(cursor);
  }
  else
  {
		short cursor = -1;
	  switch (aCursor)
	  {
	    case eCursor_standard:	::InitCursor();					break;
	    case eCursor_wait:			cursor = watchCursor;		break;
	    case eCursor_select:		cursor = iBeamCursor;		break;
	    case eCursor_hyperlink:	cursor = plusCursor;		break;
	  }
	  if (cursor > 0)
	  	::SetCursor(*(::GetCursor(cursor)));
  }
 
  return NS_OK;
  
} // nsWindow :: SetCursor
    

#pragma mark -
//-------------------------------------------------------------------------
//
// Get this component dimension
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::GetBounds(nsRect &aRect)
{
  aRect = mBounds;
  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Move this component
// aX and aY are in the parent widget coordinate system
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Move(PRUint32 aX, PRUint32 aY)
{
	if ((mBounds.x != aX) || (mBounds.y != aY))
	{
		// Invalidate the current location (unless it's the top-level window)
		if (mParent != nsnull)
			Invalidate(PR_FALSE);
	  	
		// Set the bounds
		mBounds.x = aX;
		mBounds.y = aY;

		// Recalculate the regions
		CalcWindowRegions();

		// Report the event
		ReportMoveEvent();
	}
	return NS_OK;
}

//-------------------------------------------------------------------------
//
// Resize this component
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Resize(PRUint32 aWidth, PRUint32 aHeight, PRBool aRepaint)
{
	if ((mBounds.width != aWidth) || (mBounds.height != aHeight))
	{
	  // Set the bounds
	  mBounds.width  = aWidth;
	  mBounds.height = aHeight;

		// Recalculate the regions
		CalcWindowRegions();

		// Invalidate the new location
		if (aRepaint)
			Invalidate(PR_FALSE);

		// Report the event
		ReportSizeEvent();
	}
	return NS_OK;
}

//-------------------------------------------------------------------------
//
// Resize this component
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Resize(PRUint32 aX, PRUint32 aY, PRUint32 aWidth, PRUint32 aHeight, PRBool aRepaint)
{
	nsWindow::Move(aX, aY);
	nsWindow::Resize(aWidth, aHeight, aRepaint);
	return NS_OK;
}


NS_METHOD nsWindow::GetPreferredSize(PRInt32& aWidth, PRInt32& aHeight)
{
  aWidth  = mPreferredWidth;
  aHeight = mPreferredHeight;
  return NS_ERROR_FAILURE;
}

NS_METHOD nsWindow::SetPreferredSize(PRInt32 aWidth, PRInt32 aHeight)
{
  mPreferredWidth  = aWidth;
  mPreferredHeight = aHeight;
  return NS_OK;
}

//-------------------------------------------------------------------------
// 
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::BeginResizingChildren(void)
{
	mResizingChildren = PR_TRUE;
	mSaveVisible = mVisible;
	mVisible = PR_FALSE;

	return NS_OK;
}

//-------------------------------------------------------------------------
// 
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::EndResizingChildren(void)
{
	mResizingChildren = PR_FALSE;
	mVisible = mSaveVisible;

	CalcWindowRegions();
	return NS_OK;
}

#pragma mark -
 
//-------------------------------------------------------------------------
//
// Invalidate this component visible area
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Invalidate(const nsRect &aRect, PRBool aIsSynchronous)
{
	if (!mWindowPtr)
		return NS_OK;

#if 0	// We don't want to draw synchronously on Mac: it makes the xpfe apps much slower
	static PRBool	reentrant = PR_FALSE;
	if (aIsSynchronous && !reentrant)
	{
		reentrant = PR_TRUE;	// no reentrance please
		Update();
		reentrant = PR_FALSE;
	}
	else
#endif
	{
		nsRect wRect = aRect;
		Rect macRect;
		LocalToWindowCoordinate(wRect);
		nsRectToMacRect(wRect, macRect);

		GrafPtr savePort;
		::GetPort(&savePort);
		::SetPort(mWindowPtr);
		Rect savePortRect = mWindowPtr->portRect;
		::SetOrigin(0, 0);
		::InvalRect(&macRect);
//<2F>REVISIT		::SetOrigin(savePortRect.left, savePortRect.top);
		::SetPort(savePort);
	}
	return NS_OK;
}
   
//-------------------------------------------------------------------------
//
// Invalidate this component visible area
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Invalidate(PRBool aIsSynchronous)
{
	nsWindow::Invalidate(mBounds, aIsSynchronous);
	return NS_OK;
}

inline PRUint16 COLOR8TOCOLOR16(PRUint8 color8)
{
	// return (color8 == 0xFF ? 0xFFFF : (color8 << 8));
	return (color8 << 8) | color8;	/* (color8 * 257) == (color8 * 0x0101) */
}

//-------------------------------------------------------------------------
//	StartDraw
//
//-------------------------------------------------------------------------
void nsWindow::StartDraw(nsIRenderingContext* aRenderingContext)
{
	if (mDrawing)
		return;
	mDrawing = PR_TRUE;

	CalcWindowRegions();	//<2F>REVISIT

	if (aRenderingContext == nsnull)
	{
		// make sure we have a rendering context
		mTempRenderingContext = GetRenderingContext();
		mTempRenderingContextMadeHere = PR_TRUE;
	}
	else
	{
		// if we already have a rendering context, save its state
		NS_IF_ADDREF(aRenderingContext);
		mTempRenderingContext = aRenderingContext;
		mTempRenderingContextMadeHere = PR_FALSE;
		mTempRenderingContext->PushState();

		// set the environment to the current widget
		mTempRenderingContext->Init(mContext, this);
	}

	// set the widget font. nsMacControl implements SetFont, which is where
	// the font should get set.
	if (mFontMetrics)
	{
		mTempRenderingContext->SetFont(mFontMetrics);
	}

	// set the widget background and foreground colors
	nscolor color = GetBackgroundColor();
	RGBColor macColor;
	macColor.red   = COLOR8TOCOLOR16(NS_GET_R(color));
	macColor.green = COLOR8TOCOLOR16(NS_GET_G(color));
	macColor.blue  = COLOR8TOCOLOR16(NS_GET_B(color));
	::RGBBackColor(&macColor);

	color = GetForegroundColor();
	macColor.red   = COLOR8TOCOLOR16(NS_GET_R(color));
	macColor.green = COLOR8TOCOLOR16(NS_GET_G(color));
	macColor.blue  = COLOR8TOCOLOR16(NS_GET_B(color));
	::RGBForeColor(&macColor);

	mTempRenderingContext->SetColor(color);				// just in case, set the rendering context color too
}


//-------------------------------------------------------------------------
//	EndDraw
//
//-------------------------------------------------------------------------
void nsWindow::EndDraw()
{
	if (! mDrawing)
		return;
	mDrawing = PR_FALSE;

	if (mTempRenderingContextMadeHere)
	{
		PRBool clipEmpty;
		mTempRenderingContext->PopState(clipEmpty);
	}
	NS_RELEASE(mTempRenderingContext);
}

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
PRBool nsWindow::OnPaint(nsPaintEvent &event)
{
	// override this
  return PR_TRUE;
}


//-------------------------------------------------------------------------
//	Update
//
//		Redraw this widget.
//
//		We draw the widget between BeginUpdate and EndUpdate because some
//		operations go much faster when the visRgn contains what needs to be
//		painted. Then we restore the original updateRgn and validate this
//		widget's rectangle.
//-------------------------------------------------------------------------
NS_IMETHODIMP	nsWindow::Update()
{
	if (! mVisible)
		return NS_OK;

	static PRBool  reentrant = PR_FALSE;

	if (reentrant)
		HandleUpdateEvent();
	else
	{
		reentrant = PR_TRUE;

		// make a copy of the window update rgn
		RgnHandle saveUpdateRgn = ::NewRgn();
		if (!saveUpdateRgn)
			return NS_ERROR_OUT_OF_MEMORY;
		::CopyRgn(((WindowRecord*)mWindowPtr)->updateRgn, saveUpdateRgn);

		// draw the widget
		GrafPtr savePort;
		::GetPort(&savePort);
		::SetPort(mWindowPtr);

		::BeginUpdate(mWindowPtr);
		HandleUpdateEvent();
		::EndUpdate(mWindowPtr);

		// restore the window update rgn
		::CopyRgn(saveUpdateRgn, ((WindowRecord*)mWindowPtr)->updateRgn);

		// validate the rect of the widget we have just drawn
		nsRect bounds = mBounds;
		LocalToWindowCoordinate(bounds);
		Rect macRect;
		nsRectToMacRect(bounds, macRect);
		::ValidRect(&macRect);
		::DisposeRgn(saveUpdateRgn);

		::SetPort(savePort);
		reentrant = PR_FALSE;
	}

	return NS_OK;
}


//-------------------------------------------------------------------------
//	HandleUpdateEvent
//
//		Called by the event handler to redraw the top-level widget.
//		Must be called between BeginUpdate/EndUpdate: the window visRgn
//		is expected to be set to whatever needs to be drawn.
//-------------------------------------------------------------------------
nsresult nsWindow::HandleUpdateEvent()
{
	if (! mVisible)
		return NS_OK;

	// get the damaged region from the OS
	RgnHandle damagedRgn = mWindowPtr->visRgn;

	// calculate the update region relatively to the window port rect
	// (at this point, the grafPort origin should always be 0,0
	// so mWindowRegion has to be converted to window coordinates)
	RgnHandle updateRgn = ::NewRgn();
	if (!updateRgn)
		return NS_ERROR_OUT_OF_MEMORY;
	::CopyRgn(mWindowRegion, updateRgn);

	nsRect bounds = mBounds;
	LocalToWindowCoordinate(bounds);
	::OffsetRgn(updateRgn, bounds.x, bounds.y);

	// check if the update region is visible
	::SectRgn(damagedRgn, updateRgn, updateRgn);
	if (!::EmptyRgn(updateRgn))
	{
		nsIRenderingContext* renderingContext = GetRenderingContext();
		if (renderingContext)
		{
			// determine the rect to draw
			nsRect rect;
			Rect macRect = (*updateRgn)->rgnBBox;
			::OffsetRect(&macRect, -bounds.x, -bounds.y);
			rect.SetRect(macRect.left, macRect.top, macRect.right - macRect.left, macRect.bottom - macRect.top);

			// update the widget
			UpdateWidget(rect, renderingContext);

			NS_RELEASE(renderingContext);
		}
	}
	::DisposeRgn(updateRgn);
	return NS_OK;
}


//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
void nsWindow::UpdateWidget(nsRect& aRect, nsIRenderingContext* aContext)
{
	if (! mVisible)
		return;

	// initialize the paint event
	nsPaintEvent paintEvent;
	paintEvent.eventStructType	= NS_PAINT_EVENT;		// nsEvent
	paintEvent.message					= NS_PAINT;
	paintEvent.widget						= this;							// nsGUIEvent
	paintEvent.nativeMsg				= NULL;
	paintEvent.renderingContext	= aContext;					// nsPaintEvent
	paintEvent.rect							= &aRect;

	// draw the widget
	StartDraw(aContext);
	if (OnPaint(paintEvent))
		DispatchWindowEvent(paintEvent);
	EndDraw();

	// recursively draw the children
	nsCOMPtr<nsIEnumerator> children(dont_AddRef(GetChildren()));
	if (children)
	{
		children->First();
		do
		{
			nsISupports* child;
			if (NS_SUCCEEDED(children->CurrentItem(&child)))
			{
				nsWindow* childWindow = static_cast<nsWindow*>(child);
				NS_RELEASE(child);

				nsRect childBounds;
				childWindow->GetBounds(childBounds);

				// redraw only the intersection of the child rect and the update rect
				nsRect intersection;
				if (intersection.IntersectRect(aRect, childBounds))
				{
					intersection.MoveBy(-childBounds.x, -childBounds.y);
					childWindow->UpdateWidget(intersection, aContext);
				}
    	}
		} while (NS_SUCCEEDED(children->Next()));			
	}
}


//-------------------------------------------------------------------------
//
// Scroll the bits of a window
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::Scroll(PRInt32 aDx, PRInt32 aDy, nsRect *aClipRect)
{
	if (! mVisible)
		return NS_OK;

#if 0	//<2F>REVISIT
	// scroll the rect
	nsRect scrollRect;
	if (aClipRect)
		scrollRect = *aClipRect;
	else
	{
		scrollRect = mBounds;
		scrollRect.x = scrollRect.y = 0;
	}

	Rect macRect;
	nsRectToMacRect(scrollRect, macRect);

	RgnHandle updateRgn = ::NewRgn();
	if (updateRgn == nil)
		return NS_ERROR_OUT_OF_MEMORY;

	StartDraw();
		::ScrollRect(&macRect, aDx, aDy, updateRgn);
		::InvalRgn(updateRgn);
		::DisposeRgn(updateRgn);
	EndDraw();
#else
	Invalidate(PR_FALSE);
#endif

	// scroll the children
	nsCOMPtr<nsIEnumerator> children(dont_AddRef(GetChildren()));
	if (children)
	{
		children->First();
		do
		{
			nsISupports* child;
			if (NS_SUCCEEDED(children->CurrentItem(&child)))
			{
				nsWindow* childWindow = static_cast<nsWindow*>(child);
				NS_RELEASE(child);

				nsRect bounds;
				childWindow->GetBounds(bounds);
				bounds.x += aDx;
				bounds.y += aDy;
				childWindow->SetBounds(bounds);
				childWindow->Scroll(aDx, aDy, &bounds);
  		}
		} while (NS_SUCCEEDED(children->Next()));			
	}

	// recalculate the window regions
	CalcWindowRegions();

	return NS_OK;
}

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------

PRBool nsWindow::ConvertStatus(nsEventStatus aStatus)
{
  switch (aStatus)
  {
    case nsEventStatus_eIgnore:							return(PR_FALSE);
    case nsEventStatus_eConsumeNoDefault:		return(PR_TRUE);	// don't do default processing
    case nsEventStatus_eConsumeDoDefault:		return(PR_FALSE);
    default:
      NS_ASSERTION(0, "Illegal nsEventStatus enumeration value");
      break;
  }
  return(PR_FALSE);
}

//-------------------------------------------------------------------------
//
// Invokes callback and  ProcessEvent method on Event Listener object
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::DispatchEvent(nsGUIEvent* event, nsEventStatus& aStatus)
{
  aStatus = nsEventStatus_eIgnore;
	if (! mDestructorCalled)
	{
		nsIWidget* aWidget = event->widget;
		NS_IF_ADDREF(aWidget);
	  
	  if (nsnull != mMenuListener){
	    if(NS_MENU_EVENT == event->eventStructType)
	  	  aStatus = mMenuListener->MenuSelected( static_cast<nsMenuEvent&>(*event) );
	  }
	  if (mEventCallback)
	    aStatus = (*mEventCallback)(event);

		// Dispatch to event listener if event was not consumed
	  if ((aStatus != nsEventStatus_eConsumeNoDefault) && (mEventListener != nsnull))
	    aStatus = mEventListener->ProcessEvent(*event);

		NS_IF_RELEASE(aWidget);
	}
  return NS_OK;
}

//-------------------------------------------------------------------------
PRBool nsWindow::DispatchWindowEvent(nsGUIEvent &event)
{
  nsEventStatus status;
  DispatchEvent(&event, status);
  return ConvertStatus(status);
}

//-------------------------------------------------------------------------
//
// Deal with all sort of mouse event
//
//-------------------------------------------------------------------------
PRBool nsWindow::DispatchMouseEvent(nsMouseEvent &aEvent)
{

  PRBool result = PR_FALSE;
  if (nsnull == mEventCallback && nsnull == mMouseListener) {
    return result;
  }

  // call the event callback 
  if (nsnull != mEventCallback) 
  	{
    result = (DispatchWindowEvent(aEvent));
    return result;
  	}

  if (nsnull != mMouseListener) {
    switch (aEvent.message) {
      case NS_MOUSE_MOVE: {
        result = ConvertStatus(mMouseListener->MouseMoved(aEvent));
        nsRect rect;
        GetBounds(rect);
        if (rect.Contains(aEvent.point.x, aEvent.point.y)) 
        	{
          //if (mWindowPtr == NULL || mWindowPtr != this) 
          	//{
            printf("Mouse enter");
            //mCurrentWindow = this;
          	//}
        	} 
        else 
        	{
          printf("Mouse exit");
        	}

      } break;

      case NS_MOUSE_LEFT_BUTTON_DOWN:
      case NS_MOUSE_MIDDLE_BUTTON_DOWN:
      case NS_MOUSE_RIGHT_BUTTON_DOWN:
        result = ConvertStatus(mMouseListener->MousePressed(aEvent));
        break;

      case NS_MOUSE_LEFT_BUTTON_UP:
      case NS_MOUSE_MIDDLE_BUTTON_UP:
      case NS_MOUSE_RIGHT_BUTTON_UP:
        result = ConvertStatus(mMouseListener->MouseReleased(aEvent));
        result = ConvertStatus(mMouseListener->MouseClicked(aEvent));
        break;
    } // switch
  } 
  return result;
}

#pragma mark -

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
PRBool nsWindow::ReportDestroyEvent()
{
	// nsEvent
	nsGUIEvent moveEvent;
	moveEvent.eventStructType = NS_GUI_EVENT;
	moveEvent.message			= NS_DESTROY;
	moveEvent.point.x			= 0;
	moveEvent.point.y			= 0;
	moveEvent.time				= PR_IntervalNow();

	// nsGUIEvent
	moveEvent.widget			= this;
	moveEvent.nativeMsg		= nsnull;

	// dispatch event
	return (DispatchWindowEvent(moveEvent));
}

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
PRBool nsWindow::ReportMoveEvent()
{
	// nsEvent
	nsGUIEvent moveEvent;
	moveEvent.eventStructType = NS_GUI_EVENT;
	moveEvent.message			= NS_MOVE;
	moveEvent.point.x			= mBounds.x;
	moveEvent.point.y			= mBounds.y;
	moveEvent.time				= PR_IntervalNow();

	// nsGUIEvent
	moveEvent.widget			= this;
	moveEvent.nativeMsg		= nsnull;

	// dispatch event
	return (DispatchWindowEvent(moveEvent));
}

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
PRBool nsWindow::ReportSizeEvent()
{
	// nsEvent
	nsSizeEvent sizeEvent;
	sizeEvent.eventStructType = NS_SIZE_EVENT;
	sizeEvent.message			= NS_SIZE;
	sizeEvent.point.x			= 0;
	sizeEvent.point.y			= 0;
	sizeEvent.time				= PR_IntervalNow();

	// nsGUIEvent
	sizeEvent.widget			= this;
	sizeEvent.nativeMsg		= nsnull;

	// nsSizeEvent
	sizeEvent.windowSize	= &mBounds;
	sizeEvent.mWinWidth		= mBounds.width;
	sizeEvent.mWinHeight	= mBounds.height;
  
	// dispatch event
	return(DispatchWindowEvent(sizeEvent));
}



#pragma mark -

//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
void nsWindow::CalcWindowRegions()
{
	//------
	// calculate the window region
	if (mWindowRegion == nsnull)
	{
		mWindowRegion = ::NewRgn();
		if (mWindowRegion == nsnull)
			return;
	}
 	::SetRectRgn(mWindowRegion, 0, 0, mBounds.width, mBounds.height);


	//------
	// calculate the visible region
	if (mVisRegion == nsnull)
	{
		mVisRegion = ::NewRgn();
		if (mVisRegion == nsnull)
			return;
	}
	::CopyRgn(mWindowRegion, mVisRegion);

	// intersect with all the parents
	nsWindow* parent = (nsWindow*)mParent;
	nsPoint origin(-mBounds.x, -mBounds.y);
	while (parent)
	{
		if (parent->mWindowRegion)
		{
			::OffsetRgn(parent->mWindowRegion, origin.x, origin.y);
			::SectRgn(mVisRegion, parent->mWindowRegion, mVisRegion);
			::OffsetRgn(parent->mWindowRegion, -origin.x, -origin.y);
		}
		origin.x -= parent->mBounds.x;
		origin.y -= parent->mBounds.y;
		parent = (nsWindow*)parent->mParent;
	}

	// clip the children out of the visRgn
	RgnHandle childRgn = ::NewRgn();
	if (!childRgn) return;

	nsCOMPtr<nsIEnumerator> children(dont_AddRef(GetChildren()));
	if (children)
	{
		children->First();
		do
		{
			nsISupports* child;
			if (NS_SUCCEEDED(children->CurrentItem(&child)))
			{
				nsWindow* childWindow = static_cast<nsWindow*>(child);
				NS_RELEASE(child);

				nsRect childRect;
				childWindow->GetBounds(childRect);

				Rect macRect;
				::SetRect(&macRect, childRect.x, childRect.y, childRect.XMost(), childRect.YMost());
				::RectRgn(childRgn, &macRect);
				::DiffRgn(mVisRegion, childRgn, mVisRegion);
			}
		} while (NS_SUCCEEDED(children->Next()));
	}
	::DisposeRgn(childRgn);

}

//-------------------------------------------------------------------------
/*
 *  @update  dc 08/28/98
 *  @param   aTheRegion -- The region to intersect with for this widget
 *  @return  PR_TRUE if the these regions intersect
 */

PRBool nsWindow::RgnIntersects(RgnHandle aTheRegion, RgnHandle aIntersectRgn)
{
	::SectRgn(aTheRegion, this->mWindowRegion, aIntersectRgn);
	return (::EmptyRgn(aIntersectRgn) != false);
}



//-------------------------------------------------------------------------
/*  Calculate the x and y offsets for this particular widget
 *  @update  ps 09/22/98
 *  @param   aX -- x offset amount
 *  @param   aY -- y offset amount 
 *  @return  NOTHING
 */
NS_IMETHODIMP nsWindow::CalcOffset(PRInt32 &aX,PRInt32 &aY)
{
	aX = aY = 0;
	nsIWidget* grandParent;
	nsIWidget* theParent = this->GetParent();
	while (theParent)
	{
		nsRect theRect;
		theParent->GetBounds(theRect);
		aX += theRect.x;
		aY += theRect.y;

		grandParent = theParent->GetParent();
		NS_IF_RELEASE(theParent);
		theParent = grandParent;
	}
	return NS_OK;
}


//-------------------------------------------------------------------------
// PointInWidget
//		Find if a point in local coordinates is inside this object
//-------------------------------------------------------------------------
PRBool nsWindow::PointInWidget(Point aThePoint)
{
	// get the origin in local coordinates
	nsPoint widgetOrigin(0, 0);
	LocalToWindowCoordinate(widgetOrigin);

	// get rectangle relatively to the parent
	nsRect widgetRect;
	GetBounds(widgetRect);

	// convert the topLeft corner to local coordinates
	widgetRect.MoveBy(widgetOrigin.x, widgetOrigin.y);

	// finally tell whether it's a hit
	return(widgetRect.Contains(aThePoint.h, aThePoint.v));
}


//-------------------------------------------------------------------------
// FindWidgetHit
//		Recursively look for the widget hit
//		@param aParent   -- parent widget. 
//		@param aThePoint -- a point in local coordinates to test for the hit. 
//-------------------------------------------------------------------------
nsWindow*  nsWindow::FindWidgetHit(Point aThePoint)
{
	if (!mVisible || !PointInWidget(aThePoint))
		return nsnull;

	nsWindow* widgetHit = this;

	nsIBidirectionalEnumerator* children = static_cast<nsIBidirectionalEnumerator*>(GetChildren());
	if (children)
	{
		// traverse through all the nsWindows to find out who got hit, lowest level of course
		children->Last();
		do
		{
			nsISupports* child;
			if (NS_SUCCEEDED(children->CurrentItem(&child)))
      {
      	nsWindow* childWindow = static_cast<nsWindow*>(child);
				NS_RELEASE(child);

			  nsWindow* deeperHit = childWindow->FindWidgetHit(aThePoint);
			  if (deeperHit)
			  {
				  widgetHit = deeperHit;
				  break;
			  }
      }
		}
    while (NS_SUCCEEDED(children->Prev()));
		NS_RELEASE(children);
	}

	return widgetHit;
}

#pragma mark -
//-------------------------------------------------------------------------
//
// 
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::WidgetToScreen(const nsRect& aOldRect, nsRect& aNewRect)
{
	NS_NOTYETIMPLEMENTED("nsWindow::WidgetToScreen");
	return NS_OK;
}

//-------------------------------------------------------------------------
//
// 
//
//-------------------------------------------------------------------------
NS_IMETHODIMP nsWindow::ScreenToWidget(const nsRect& aOldRect, nsRect& aNewRect)
{
	NS_NOTYETIMPLEMENTED("nsWindow::ScreenToWidget");
	return NS_OK;
} 


/*
 *  Set a Mac Rect to the value of an nsRect 
 *  The source rect is assumed to be in pixels not TWIPS
 *  @update  gpk 08/27/98
 *  @param   aRect -- The nsRect that is the source
 *  @param   aMacRect -- The Mac Rect destination
 */
void nsWindow::nsRectToMacRect(const nsRect& aRect, Rect& aMacRect) const
{
		aMacRect.left = aRect.x;
		aMacRect.top = aRect.y;
		aMacRect.right = aRect.x + aRect.width;
		aMacRect.bottom = aRect.y + aRect.height;
}


//=================================================================
/*  Convert the coordinates to some device coordinates so GFX can draw.
 *  @update  dc 09/16/98
 *  @param   nscoord -- X coordinate to convert
 *  @param   nscoord -- Y coordinate to convert
 *  @return  NONE
 */
void  nsWindow::ConvertToDeviceCoordinates(nscoord &aX, nscoord &aY)
{
	PRInt32	offX, offY;
  this->CalcOffset(offX,offY);

	aX += offX;
	aY += offY;
}