path: root/WebKit/mac/Carbon/HIWebView.mm

/*
 * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer. 
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __LP64__

#import "HIWebView.h"

#import "CarbonWindowAdapter.h"
#import "HIViewAdapter.h"
#import "WebHTMLViewInternal.h"
#import "WebKit.h"

#import <objc/objc-runtime.h>
#import <WebKitSystemInterface.h>

@interface NSWindow (AppKitSecretsHIWebViewKnows)
- (void)_removeWindowRef;
@end

@interface NSView (AppKitSecretsHIWebViewKnows)
- (void)_clearDirtyRectsForTree;
@end

extern "C" void HIWebViewRegisterClass();

@interface MenuItemProxy : NSObject <NSValidatedUserInterfaceItem>
{
    int     _tag;
    SEL _action;
}

- (id)initWithAction:(SEL)action;
- (SEL)action;
- (int)tag;

@end

@implementation MenuItemProxy

- (id)initWithAction:(SEL)action
{
    [super init];
    if (self == nil) return nil;

    _action = action;

    return self;
}

- (SEL)action
{
       return _action;
}

- (int)tag 
{
    return 0;
}

@end

struct HIWebView
{
    HIViewRef							fViewRef;

    WebView*							fWebView;
    NSView*								fFirstResponder;
    CarbonWindowAdapter	*				fKitWindow;
    bool								fIsComposited;
    CFRunLoopObserverRef				fUpdateObserver;
};
typedef struct HIWebView HIWebView;

static const OSType NSAppKitPropertyCreator = 'akit';
/*
These constants are not used. Commented out to make the compiler happy.
static const OSType NSViewCarbonControlViewPropertyTag = 'view';
static const OSType NSViewCarbonControlAutodisplayPropertyTag = 'autd';
static const OSType NSViewCarbonControlFirstResponderViewPropertyTag = 'frvw';
*/
static const OSType NSCarbonWindowPropertyTag = 'win ';

#ifdef BUILDING_ON_TIGER
const int typeByteCount = typeSInt32;
#endif

static SEL _NSSelectorForHICommand( const HICommand* hiCommand );

static const EventTypeSpec kEvents[] = { 
	{ kEventClassHIObject, kEventHIObjectConstruct },
	{ kEventClassHIObject, kEventHIObjectDestruct },
	
	{ kEventClassMouse, kEventMouseUp },
	{ kEventClassMouse, kEventMouseMoved },
	{ kEventClassMouse, kEventMouseDragged },
	{ kEventClassMouse, kEventMouseWheelMoved },

	{ kEventClassKeyboard, kEventRawKeyDown },
	{ kEventClassKeyboard, kEventRawKeyRepeat },

	{ kEventClassCommand, kEventCommandProcess },
	{ kEventClassCommand, kEventCommandUpdateStatus },

	{ kEventClassControl, kEventControlInitialize },
	{ kEventClassControl, kEventControlDraw },
	{ kEventClassControl, kEventControlHitTest },
	{ kEventClassControl, kEventControlGetPartRegion },
	{ kEventClassControl, kEventControlGetData },
	{ kEventClassControl, kEventControlBoundsChanged },
	{ kEventClassControl, kEventControlActivate },
	{ kEventClassControl, kEventControlDeactivate },
	{ kEventClassControl, kEventControlOwningWindowChanged },
	{ kEventClassControl, kEventControlClick },
	{ kEventClassControl, kEventControlContextualMenuClick },
	{ kEventClassControl, kEventControlSetFocusPart }
};

#define kHIViewBaseClassID		CFSTR( "com.apple.hiview" )
#define kHIWebViewClassID		CFSTR( "com.apple.HIWebView" )

static HIWebView*		HIWebViewConstructor( HIViewRef inView );
static void				HIWebViewDestructor( HIWebView* view );

static OSStatus			HIWebViewEventHandler(
								EventHandlerCallRef	inCallRef,
								EventRef			inEvent,
								void *				inUserData );

static UInt32			GetBehaviors();
static ControlKind		GetKind();
static void				Draw( HIWebView* inView, RgnHandle limitRgn, CGContextRef inContext );
static ControlPartCode	HitTest( HIWebView* view, const HIPoint* where );
static OSStatus			GetRegion( HIWebView* view, ControlPartCode inPart, RgnHandle outRgn );
static void				BoundsChanged(
								HIWebView*			inView,
								UInt32				inOptions,
								const HIRect*		inOriginalBounds,
								const HIRect*		inCurrentBounds );
static void				OwningWindowChanged(
								HIWebView*			view,
								WindowRef			oldWindow,
								WindowRef			newWindow );
static void				ActiveStateChanged( HIWebView* view );

static OSStatus			Click( HIWebView* inView, EventRef inEvent );
static OSStatus			ContextMenuClick( HIWebView* inView, EventRef inEvent );
static OSStatus			MouseUp( HIWebView* inView, EventRef inEvent );
static OSStatus			MouseMoved( HIWebView* inView, EventRef inEvent );
static OSStatus			MouseDragged( HIWebView* inView, EventRef inEvent );
static OSStatus			MouseWheelMoved( HIWebView* inView, EventRef inEvent );

static OSStatus			ProcessCommand( HIWebView* inView, const HICommand* inCommand );
static OSStatus			UpdateCommandStatus( HIWebView* inView, const HICommand* inCommand );

static OSStatus			SetFocusPart(
								HIWebView*				view,
								ControlPartCode 		desiredFocus,
								RgnHandle 				invalidRgn,
								Boolean 				focusEverything,
								ControlPartCode* 		actualFocus );
static NSView*			AdvanceFocus( HIWebView* view, bool forward );
static void				RelinquishFocus( HIWebView* view, bool inAutodisplay );

static WindowRef		GetWindowRef( HIWebView* inView );
static void				SyncFrame( HIWebView* inView );

static OSStatus			WindowHandler( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData );

static void				StartUpdateObserver( HIWebView* view );
static void				StopUpdateObserver( HIWebView* view );

static inline void HIRectToQDRect( const HIRect* inRect, Rect* outRect )
{
    outRect->top = (SInt16)CGRectGetMinY( *inRect );
    outRect->left = (SInt16)CGRectGetMinX( *inRect );
    outRect->bottom = (SInt16)CGRectGetMaxY( *inRect );
    outRect->right = (SInt16)CGRectGetMaxX( *inRect );
}

//----------------------------------------------------------------------------------
// HIWebViewCreate
//----------------------------------------------------------------------------------
//
OSStatus
HIWebViewCreate(HIViewRef* outControl)
{
    HIWebViewRegisterClass();
    return HIObjectCreate(kHIWebViewClassID, NULL, (HIObjectRef*)outControl);
}

//----------------------------------------------------------------------------------
// HIWebViewGetWebView
//----------------------------------------------------------------------------------
//
WebView*
HIWebViewGetWebView( HIViewRef inView )
{
	HIWebView* 	view = (HIWebView*)HIObjectDynamicCast( (HIObjectRef)inView, kHIWebViewClassID );
	WebView*			result = NULL;
	
	if ( view )
		result = view->fWebView;
	
	return result;
}

//----------------------------------------------------------------------------------
// HIWebViewConstructor
//----------------------------------------------------------------------------------
//

static HIWebView*
HIWebViewConstructor( HIViewRef inView )
{
	HIWebView*		view = (HIWebView*)malloc( sizeof( HIWebView ) );
	
	if ( view )
	{
		NSRect		frame = { { 0, 0 }, { 400, 400  } };
	
		view->fViewRef = inView;

                WebView *webView = [[WebView alloc] initWithFrame: frame];
                CFRetain(webView);
                [webView release];
		view->fWebView = webView;
		[HIViewAdapter bindHIViewToNSView:inView nsView:view->fWebView];
		
		view->fFirstResponder = NULL;
		view->fKitWindow = NULL;
        view->fIsComposited = false;
        view->fUpdateObserver = NULL;
	}
	
	return view;
}

//----------------------------------------------------------------------------------
// HIWebViewDestructor
//----------------------------------------------------------------------------------
//
static void
HIWebViewDestructor( HIWebView* inView )
{
    [HIViewAdapter unbindNSView:inView->fWebView];
    CFRelease(inView->fWebView);

    free(inView);
}

//----------------------------------------------------------------------------------
// HIWebViewRegisterClass
//----------------------------------------------------------------------------------
//
void
HIWebViewRegisterClass()
{
	static bool sRegistered;
	
	if ( !sRegistered )
	{
		HIObjectRegisterSubclass( kHIWebViewClassID, kHIViewBaseClassID, 0, HIWebViewEventHandler,
			GetEventTypeCount( kEvents ), kEvents, 0, NULL );
		sRegistered = true;
	}
}

//----------------------------------------------------------------------------------
// GetBehaviors
//----------------------------------------------------------------------------------
//
static UInt32
GetBehaviors()
{
	return kControlSupportsDataAccess | kControlSupportsGetRegion | kControlGetsFocusOnClick;
}

//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
//
static void
Draw( HIWebView* inView, RgnHandle limitRgn, CGContextRef inContext )
{
	HIRect				bounds;
	Rect				drawRect;
	HIRect				hiRect;
	bool				createdContext = false;

    if (!inView->fIsComposited)
    {
        GrafPtr port;
        Rect portRect;

        GetPort( &port );
        GetPortBounds( port, &portRect );
        CreateCGContextForPort( port, &inContext );
        SyncCGContextOriginWithPort( inContext, port );
        CGContextTranslateCTM( inContext, 0, (portRect.bottom - portRect.top) );
        CGContextScaleCTM( inContext, 1, -1 );
        createdContext = true;
    }

	HIViewGetBounds( inView->fViewRef, &bounds );

    CGContextRef savedContext = WKNSWindowOverrideCGContext(inView->fKitWindow, inContext);
    [NSGraphicsContext setCurrentContext:[inView->fKitWindow graphicsContext]];

	GetRegionBounds( limitRgn, &drawRect );

    if ( !inView->fIsComposited )
        OffsetRect( &drawRect, (SInt16)-bounds.origin.x, (SInt16)-bounds.origin.y );
    
	hiRect.origin.x = drawRect.left;
	hiRect.origin.y = bounds.size.height - drawRect.bottom; // flip y
	hiRect.size.width = drawRect.right - drawRect.left;
	hiRect.size.height = drawRect.bottom - drawRect.top;

//    printf( "Drawing: drawRect is (%g %g) (%g %g)\n", hiRect.origin.x, hiRect.origin.y,
//            hiRect.size.width, hiRect.size.height );

    // FIXME: We need to do layout before Carbon has decided what region needs drawn.
    // In Cocoa we make sure to do layout and invalidate any new regions before draw, so everything
    // can be drawn in one pass. Doing a layout here will cause new regions to be invalidated, but they
    // will not all be drawn in this pass since we already have a fixed rect we are going to display.

    NSView <WebDocumentView> *documentView = [[[inView->fWebView mainFrame] frameView] documentView];
    if ([documentView isKindOfClass:[WebHTMLView class]])
        [(WebHTMLView *)documentView _web_layoutIfNeededRecursive];

    if ( inView->fIsComposited )
        [inView->fWebView displayIfNeededInRect: *(NSRect*)&hiRect];
    else
        [inView->fWebView displayRect:*(NSRect*)&hiRect];

    WKNSWindowRestoreCGContext(inView->fKitWindow, savedContext);

    if ( !inView->fIsComposited )
    {
        HIViewRef      view;
        HIViewFindByID( HIViewGetRoot( GetControlOwner( inView->fViewRef ) ), kHIViewWindowGrowBoxID, &view );
        if ( view )
        {
            HIRect     frame;

            HIViewGetBounds( view, &frame );
            HIViewConvertRect( &frame, view, NULL );

            hiRect.origin.x = drawRect.left;
            hiRect.origin.y = drawRect.top;
            hiRect.size.width = drawRect.right - drawRect.left;
            hiRect.size.height = drawRect.bottom - drawRect.top;

            HIViewConvertRect( &hiRect, inView->fViewRef, NULL );

            if ( CGRectIntersectsRect( frame, hiRect ) )
                HIViewSetNeedsDisplay( view, true );
        }
     }

    if ( createdContext )
    {
        CGContextSynchronize( inContext );
        CGContextRelease( inContext );
    }
}

//----------------------------------------------------------------------------------
// HitTest
//----------------------------------------------------------------------------------
//
static ControlPartCode
HitTest( HIWebView* view, const HIPoint* where )
{
	HIRect		bounds;
	
	HIViewGetBounds( view->fViewRef, &bounds );

	if ( CGRectContainsPoint( bounds, *where ) )
		return 1;
	else
		return kControlNoPart;
}

//----------------------------------------------------------------------------------
// GetRegion
//----------------------------------------------------------------------------------
//
static OSStatus
GetRegion(
	HIWebView*			inView,
	ControlPartCode		inPart,
	RgnHandle			outRgn )
{
	OSStatus	 err = eventNotHandledErr;
	
	if ( inPart == -3 ) // kControlOpaqueMetaPart:
	{
		if ( [inView->fWebView isOpaque] )
		{
			HIRect	bounds;
			Rect	temp;
			
			HIViewGetBounds( inView->fViewRef, &bounds );

			temp.top = (SInt16)bounds.origin.y;
			temp.left = (SInt16)bounds.origin.x;
			temp.bottom = (SInt16)CGRectGetMaxY( bounds );
			temp.right = (SInt16)CGRectGetMaxX( bounds );

			RectRgn( outRgn, &temp );
			err = noErr;
		}
	}
	
	return err;
}

static WindowRef
GetWindowRef( HIWebView* inView )
{
       return GetControlOwner( inView->fViewRef );
}

//----------------------------------------------------------------------------------
// Click
//----------------------------------------------------------------------------------
//
static OSStatus
Click(HIWebView* inView, EventRef inEvent)
{
    NSEvent *kitEvent = WKCreateNSEventWithCarbonClickEvent(inEvent, GetWindowRef(inView));

    if (!inView->fIsComposited)
        StartUpdateObserver(inView);

    [inView->fKitWindow sendEvent:kitEvent];

    if (!inView->fIsComposited)
        StopUpdateObserver(inView);

    [kitEvent release];

    return noErr;
}

//----------------------------------------------------------------------------------
// MouseUp
//----------------------------------------------------------------------------------
//
static OSStatus
MouseUp( HIWebView* inView, EventRef inEvent )
{
	NSEvent* kitEvent = WKCreateNSEventWithCarbonEvent(inEvent);

    [inView->fKitWindow sendEvent:kitEvent];
	
    [kitEvent release];
    
	return noErr;
}

//----------------------------------------------------------------------------------
// MouseMoved
//----------------------------------------------------------------------------------
//
static OSStatus
MouseMoved( HIWebView* inView, EventRef inEvent )
{
    NSEvent *kitEvent = WKCreateNSEventWithCarbonMouseMoveEvent(inEvent, inView->fKitWindow);
    [inView->fKitWindow sendEvent:kitEvent];
	[kitEvent release];

	return noErr;
}

//----------------------------------------------------------------------------------
// MouseDragged
//----------------------------------------------------------------------------------
//
static OSStatus
MouseDragged( HIWebView* inView, EventRef inEvent )
{
	NSEvent* kitEvent = WKCreateNSEventWithCarbonEvent(inEvent);

    [inView->fKitWindow sendEvent:kitEvent];

	[kitEvent release];
	
	return noErr;
}

//----------------------------------------------------------------------------------
// MouseDragged
//----------------------------------------------------------------------------------
//
static OSStatus
MouseWheelMoved( HIWebView* inView, EventRef inEvent )
{
	NSEvent* kitEvent = WKCreateNSEventWithCarbonEvent(inEvent);

    [inView->fKitWindow sendEvent:kitEvent];

	[kitEvent release];
	
	return noErr;
}

//----------------------------------------------------------------------------------
// ContextMenuClick
//----------------------------------------------------------------------------------
//
static OSStatus
ContextMenuClick( HIWebView* inView, EventRef inEvent )
{
    NSView *webView = inView->fWebView;
    NSWindow *window = [webView window];

    // Get the point out of the event.
    HIPoint point;
    GetEventParameter(inEvent, kEventParamMouseLocation, typeHIPoint, NULL, sizeof(point), NULL, &point);
    HIViewConvertPoint(&point, inView->fViewRef, NULL);
    
    // Flip the Y coordinate, since Carbon is flipped relative to the AppKit.
    NSPoint location = NSMakePoint(point.x, [window frame].size.height - point.y);
    
    // Make up an event with the point and send it to the window.
    NSEvent *kitEvent = [NSEvent mouseEventWithType:NSRightMouseDown
                                           location:location
                                      modifierFlags:0
                                          timestamp:GetEventTime(inEvent)
                                       windowNumber:[window windowNumber]
                                            context:0
                                        eventNumber:0
                                         clickCount:1
                                           pressure:0];
    [inView->fKitWindow sendEvent:kitEvent];
    return noErr;
}

//----------------------------------------------------------------------------------
// GetKind
//----------------------------------------------------------------------------------
//
static ControlKind
GetKind()
{
	const ControlKind kMyKind = { 'appl', 'wbvw' };
	
	return kMyKind;
}

//----------------------------------------------------------------------------------
// BoundsChanged
//----------------------------------------------------------------------------------
//
static void
BoundsChanged(
	HIWebView*			inView,
	UInt32				inOptions,
	const HIRect*		inOriginalBounds,
	const HIRect*		inCurrentBounds )
{
	if ( inView->fWebView )
	{
		SyncFrame( inView );
	}
}

//----------------------------------------------------------------------------------
// OwningWindowChanged
//----------------------------------------------------------------------------------
//
static void
OwningWindowChanged(
	HIWebView*			view,
	WindowRef			oldWindow,
	WindowRef			newWindow )
{
    if ( newWindow ){
        WindowAttributes	attrs;
        
        OSStatus err = GetWindowProperty(newWindow, NSAppKitPropertyCreator, NSCarbonWindowPropertyTag, sizeof(NSWindow *), NULL, &view->fKitWindow);
        if ( err != noErr )
        {
            const EventTypeSpec kWindowEvents[] = {
            { kEventClassWindow, kEventWindowClosed },
            { kEventClassMouse, kEventMouseMoved },
            { kEventClassMouse, kEventMouseUp },
            { kEventClassMouse, kEventMouseDragged },
            { kEventClassMouse, kEventMouseWheelMoved },
            { kEventClassKeyboard, kEventRawKeyDown },
            { kEventClassKeyboard, kEventRawKeyRepeat },
            { kEventClassKeyboard, kEventRawKeyUp },
            { kEventClassControl, kEventControlClick },
            };
            
            view->fKitWindow = [[CarbonWindowAdapter alloc] initWithCarbonWindowRef: newWindow takingOwnership: NO disableOrdering:NO carbon:YES];
            SetWindowProperty(newWindow, NSAppKitPropertyCreator, NSCarbonWindowPropertyTag, sizeof(NSWindow *), &view->fKitWindow);
            
            InstallWindowEventHandler( newWindow, WindowHandler, GetEventTypeCount( kWindowEvents ), kWindowEvents, newWindow, NULL );
        }
        
        [[view->fKitWindow contentView] addSubview:view->fWebView];
        
        GetWindowAttributes( newWindow, &attrs );
        view->fIsComposited = ( ( attrs & kWindowCompositingAttribute ) != 0 );
        
        SyncFrame( view );        
    }
    else
    {
        // Be sure to detach the cocoa view, too.
        if ( view->fWebView )
            [view->fWebView removeFromSuperview];
        
        view->fKitWindow = NULL; // break the ties that bind
    }
}

//-------------------------------------------------------------------------------------
//	WindowHandler
//-------------------------------------------------------------------------------------
//	Redirect mouse events to the views beneath them. This is required for WebKit to work
// 	properly. We install it once per window. We also tap into window close to release
//	the NSWindow that shadows our Carbon window.
//
static OSStatus
WindowHandler( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData )
{
	WindowRef	window = (WindowRef)inUserData;
	OSStatus	result = eventNotHandledErr;

    switch( GetEventClass( inEvent ) )
    {
    	case kEventClassControl:
            {
            switch( GetEventKind( inEvent ) )
            {
                case kEventControlClick:
                    {
                        CarbonWindowAdapter *kitWindow;
                        OSStatus err;
                        
                        err = GetWindowProperty( window, NSAppKitPropertyCreator, NSCarbonWindowPropertyTag, sizeof(NSWindow *), NULL, &kitWindow);
                        
                        // We must be outside the HIWebView, relinquish focus.
                        [kitWindow relinquishFocus];
                    }
                    break;
                }
            }
            break;
            
    	case kEventClassKeyboard:
    		{
                NSWindow*		kitWindow;
                OSStatus		err;
   				NSEvent*		kitEvent;
   				
   				// if the first responder in the kit window is something other than the
   				// window, we assume a subview of the webview is focused. we must send
   				// the event to the window so that it goes through the kit's normal TSM
   				// logic, and -- more importantly -- allows any delegates associated
   				// with the first responder to have a chance at the event.
   				
				err = GetWindowProperty( window, NSAppKitPropertyCreator, NSCarbonWindowPropertyTag, sizeof(NSWindow *), NULL, &kitWindow);
				if ( err == noErr )
				{
					NSResponder* responder = [kitWindow firstResponder];
					if ( responder != kitWindow )
					{
                        kitEvent = WKCreateNSEventWithCarbonEvent(inEvent);
						
						[kitWindow sendEvent:kitEvent];
						[kitEvent release];
						
						result = noErr;
					}
				}
    		}
    		break;

        case kEventClassWindow:
            {
                NSWindow*	kitWindow;
                OSStatus	err;
                
                err = GetWindowProperty( window, NSAppKitPropertyCreator, NSCarbonWindowPropertyTag, sizeof(NSWindow *), NULL, &kitWindow);
                if ( err == noErr )
                {
                    [kitWindow _removeWindowRef];
                    [kitWindow close];
                }
	
                result = noErr;
            }
            break;
        
        case kEventClassMouse:
            switch (GetEventKind(inEvent))
            {
                case kEventMouseMoved:
                    {
                        Point where;
                        GetEventParameter(inEvent, kEventParamMouseLocation, typeQDPoint, NULL, sizeof(Point), NULL, &where);

                        WindowRef temp;
                        FindWindow(where, &temp);
                        if (temp == window)
                        {
                            Rect bounds;
                            GetWindowBounds(window, kWindowStructureRgn, &bounds);
                            where.h -= bounds.left;
                            where.v -= bounds.top;
                            SetEventParameter(inEvent, kEventParamWindowRef, typeWindowRef, sizeof(WindowRef), &window);
                            SetEventParameter(inEvent, kEventParamWindowMouseLocation, typeQDPoint, sizeof(Point), &where);

                            OSStatus err = noErr;
                            HIViewRef view = NULL;

                            err = HIViewGetViewForMouseEvent(HIViewGetRoot(window), inEvent, &view);
                            if (err == noErr && view && HIObjectIsOfClass((HIObjectRef)view, kHIWebViewClassID))
                                result = SendEventToEventTargetWithOptions(inEvent, HIObjectGetEventTarget((HIObjectRef)view), kEventTargetDontPropagate);
                        }
                    }
                    break;
                
                case kEventMouseUp:
                case kEventMouseDragged:
                case kEventMouseWheelMoved:
                    {
                        OSStatus err = noErr;
                        HIViewRef view = NULL;

                        err = HIViewGetViewForMouseEvent(HIViewGetRoot(window), inEvent, &view);
                        if (err == noErr && view && HIObjectIsOfClass((HIObjectRef)view, kHIWebViewClassID))
                            result = SendEventToEventTargetWithOptions(inEvent, HIObjectGetEventTarget((HIObjectRef)view), kEventTargetDontPropagate);
                    }
                    break;
            }
            break;
    }

	return result;
}


//----------------------------------------------------------------------------------
// SyncFrame
//----------------------------------------------------------------------------------
//
static void
SyncFrame( HIWebView* inView )
{
	HIViewRef	parent = HIViewGetSuperview( inView->fViewRef );
	
	if ( parent )
	{
        if ( inView->fIsComposited )
        {
            HIRect		frame;
            HIRect		parentBounds;
            NSPoint		origin;

            HIViewGetFrame( inView->fViewRef, &frame );
            HIViewGetBounds( parent, &parentBounds );
            
            origin.x = frame.origin.x;
            origin.y = parentBounds.size.height - CGRectGetMaxY( frame );
//    printf( "syncing to (%g %g) (%g %g)\n", origin.x, origin.y,
//            frame.size.width, frame.size.height );
            [inView->fWebView setFrameOrigin: origin];
            [inView->fWebView setFrameSize: *(NSSize*)&frame.size];
        }
        else
        {
            GrafPtr			port = GetWindowPort( GetControlOwner( inView->fViewRef ) );
            PixMapHandle	portPix = GetPortPixMap( port );
            Rect			bounds;
            HIRect			rootFrame;
            HIRect			frame;

            GetControlBounds( inView->fViewRef, &bounds );
            OffsetRect( &bounds, -(**portPix).bounds.left, -(**portPix).bounds.top );

//            printf( "control lives at %d %d %d %d in window-coords\n", bounds.top, bounds.left,
//                bounds.bottom, bounds.right );
  
            HIViewGetFrame( HIViewGetRoot( GetControlOwner( inView->fViewRef ) ), &rootFrame );

            frame.origin.x = bounds.left;
            frame.origin.y = rootFrame.size.height - bounds.bottom;
            frame.size.width = bounds.right - bounds.left;
            frame.size.height = bounds.bottom - bounds.top;

//            printf( "   before frame convert (%g %g) (%g %g)\n", frame.origin.x, frame.origin.y,
//                frame.size.width, frame.size.height );
            
            [inView->fWebView convertRect:*(NSRect*)&frame fromView:nil];

//            printf( "   moving web view to (%g %g) (%g %g)\n", frame.origin.x, frame.origin.y,
//                frame.size.width, frame.size.height );

            [inView->fWebView setFrameOrigin: *(NSPoint*)&frame.origin];
            [inView->fWebView setFrameSize: *(NSSize*)&frame.size];
        }
    }
}

//----------------------------------------------------------------------------------
// SetFocusPart
//----------------------------------------------------------------------------------
//
static OSStatus
SetFocusPart(
	HIWebView*				view,
	ControlPartCode 		desiredFocus,
	RgnHandle 				invalidRgn,
	Boolean 				focusEverything,
	ControlPartCode* 		actualFocus )
{
    NSView *	freshlyMadeFirstResponderView;
    SInt32 		partCodeToReturn;

    // Do what Carbon is telling us to do.
    if ( desiredFocus == kControlFocusNoPart )
	{
        // Relinquish the keyboard focus.
        RelinquishFocus( view, true ); //(autodisplay ? YES : NO));
        freshlyMadeFirstResponderView = nil;
        partCodeToReturn = kControlFocusNoPart;
		//NSLog(@"Relinquished the key focus because we have no choice.");
    }
	else if ( desiredFocus == kControlFocusNextPart || desiredFocus == kControlFocusPrevPart )
	{
        BOOL goForward = (desiredFocus == kControlFocusNextPart );

        // Advance the keyboard focus, maybe right off of this view.  Maybe a subview of this one already has the keyboard focus, maybe not.
        freshlyMadeFirstResponderView = AdvanceFocus( view, goForward );
        if (freshlyMadeFirstResponderView)
            partCodeToReturn = desiredFocus;
        else
            partCodeToReturn = kControlFocusNoPart;
        //NSLog(freshlyMadeFirstResponderView ? @"Advanced the key focus." : @"Relinquished the key focus.");
    }
	else
	{
		// What's this?
                if (desiredFocus != kControlIndicatorPart) {
                    check(false);
                }
		freshlyMadeFirstResponderView = nil;
		partCodeToReturn = desiredFocus;
    }

	view->fFirstResponder = freshlyMadeFirstResponderView;

	*actualFocus = partCodeToReturn;

	// Done.
	return noErr;
}

//----------------------------------------------------------------------------------
// AdvanceFocus
//----------------------------------------------------------------------------------
//
static NSView*
AdvanceFocus( HIWebView* view, bool forward )
{
    NSResponder*		oldFirstResponder;
    NSView*				currentKeyView;
    NSView*				viewWeMadeFirstResponder;
    
    //	Focus on some part (subview) of this control (view).  Maybe
	//	a subview of this one already has the keyboard focus, maybe not.
	
	oldFirstResponder = [view->fKitWindow firstResponder];

	// If we tab out of our NSView, it will no longer be the responder
	// when we get here. We'll try this trick for now. We might need to
	// tag the view appropriately.

	if ( view->fFirstResponder && ( (NSResponder*)view->fFirstResponder != oldFirstResponder ) )
	{
		return NULL;
	}
	
	if ( [oldFirstResponder isKindOfClass:[NSView class]] )
	{
		NSView*		tentativeNewKeyView;

        // Some view in this window already has the keyboard focus.  It better at least be a subview of this one.
        NSView*	oldFirstResponderView = (NSView *)oldFirstResponder;
        check( [oldFirstResponderView isDescendantOf:view->fWebView] );

		if ( oldFirstResponderView != view->fFirstResponder
			&& ![oldFirstResponderView isDescendantOf:view->fFirstResponder] )
		{
            // Despite our efforts to record what view we made the first responder
			// (for use in the next paragraph) we couldn't keep up because the user
			// has clicked in a text field to make it the key focus, instead of using
			// the tab key.  Find a control on which it's reasonable to invoke
			// -[NSView nextValidKeyView], taking into account the fact that
			// NSTextFields always pass on first-respondership to a temporarily-
			// contained NSTextView.

			NSView *viewBeingTested;
			currentKeyView = oldFirstResponderView;
			viewBeingTested = currentKeyView;
			while ( viewBeingTested != view->fWebView )
			{
				if ( [viewBeingTested isKindOfClass:[NSTextField class]] )
				{
					currentKeyView = viewBeingTested;
					break;
				}
				else
				{
					viewBeingTested = [viewBeingTested superview];
				}
			}
		}
		else 
		{
			// We recorded which view we made into the first responder the
			// last time the user hit the tab key, and nothing has invalidated
			// our recorded value since.
			
			currentKeyView = view->fFirstResponder;
		}

        // Try to move on to the next or previous key view.  We use the laboriously
		// recorded/figured currentKeyView instead of just oldFirstResponder as the
		// jumping-off-point when searching for the next valid key view.  This is so
		// we don't get fooled if we recently made some view the first responder, but
		// it passed on first-responder-ness to some temporary subview.
		
        // You can't put normal views in a window with Carbon-control-wrapped views.
		// Stuff like this would break.  M.P. Notice - 12/2/00

        tentativeNewKeyView = forward ? [currentKeyView nextValidKeyView] : [currentKeyView previousValidKeyView];
        if ( tentativeNewKeyView && [tentativeNewKeyView isDescendantOf:view->fWebView] )
		{
            // The user has tabbed to another subview of this control view.  Change the keyboard focus.
            //NSLog(@"Tabbed to the next or previous key view.");

            [view->fKitWindow makeFirstResponder:tentativeNewKeyView];
            viewWeMadeFirstResponder = tentativeNewKeyView;
        }
		else
		{
            // The user has tabbed past the subviews of this control view.  The window is the first responder now.
            //NSLog(@"Tabbed past the first or last key view.");
            [view->fKitWindow makeFirstResponder:view->fKitWindow];
            viewWeMadeFirstResponder = nil;
        }
    }
	else
	{
        // No view in this window has the keyboard focus.  This view should
		// try to select one of its key subviews.  We're not interested in
		// the subviews of sibling views here.

		//NSLog(@"No keyboard focus in window. Attempting to set...");

		NSView *tentativeNewKeyView;
		check(oldFirstResponder==fKitWindow);
		if ( [view->fWebView acceptsFirstResponder] )
			tentativeNewKeyView = view->fWebView;
		else
			tentativeNewKeyView = [view->fWebView nextValidKeyView];
        if ( tentativeNewKeyView && [tentativeNewKeyView isDescendantOf:view->fWebView] )
		{
            // This control view has at least one subview that can take the keyboard focus.
            if ( !forward )
			{
                // The user has tabbed into this control view backwards.  Find
				// and select the last subview of this one that can take the
				// keyboard focus.  Watch out for loops of valid key views.

                NSView *firstTentativeNewKeyView = tentativeNewKeyView;
                NSView *nextTentativeNewKeyView = [tentativeNewKeyView nextValidKeyView];
                while ( nextTentativeNewKeyView 
						&& [nextTentativeNewKeyView isDescendantOf:view->fWebView] 
						&& nextTentativeNewKeyView!=firstTentativeNewKeyView)
				{
                    tentativeNewKeyView = nextTentativeNewKeyView;
                    nextTentativeNewKeyView = [tentativeNewKeyView nextValidKeyView];
                }

            }

            // Set the keyboard focus.
            //NSLog(@"Tabbed into the first or last key view.");
            [view->fKitWindow makeFirstResponder:tentativeNewKeyView];
            viewWeMadeFirstResponder = tentativeNewKeyView;
        }
		else
		{
            // This control view has no subviews that can take the keyboard focus.
            //NSLog(@"Can't tab into this view.");
            viewWeMadeFirstResponder = nil;
        }
    }

    // Done.
    return viewWeMadeFirstResponder;
}


//----------------------------------------------------------------------------------
// RelinquishFocus
//----------------------------------------------------------------------------------
//
static void
RelinquishFocus( HIWebView* view, bool inAutodisplay )
{
    NSResponder*  firstResponder;

    // Apparently Carbon thinks that some subview of this control view has the keyboard focus,
	// or we wouldn't be being asked to relinquish focus.

	firstResponder = [view->fKitWindow firstResponder];
	if ( [firstResponder isKindOfClass:[NSView class]] )
	{
		// Some subview of this control view really is the first responder right now.
		check( [(NSView *)firstResponder isDescendantOf:view->fWebView] );

		// Make the window the first responder, so that no view is the key view.
        [view->fKitWindow makeFirstResponder:view->fKitWindow];

		// 	If this control is not allowed to do autodisplay, don't let
		//	it autodisplay any just-changed focus rings or text on the
		//	next go around the event loop. I'm probably clearing more
		//	dirty rects than I have to, but it doesn't seem to hurt in
		//	the print panel accessory view case, and I don't have time
		//	to figure out exactly what -[NSCell _setKeyboardFocusRingNeedsDisplay]
		//	is doing when invoked indirectly from -makeFirstResponder up above.  M.P. Notice - 12/4/00

		if ( !inAutodisplay )
			[[view->fWebView opaqueAncestor] _clearDirtyRectsForTree];
    }
	else
	{
		//  The Cocoa first responder does not correspond to the Carbon
		//	control that has the keyboard focus.  This can happen when
		//	you've closed a dialog by hitting return in an NSTextView
		//	that's a subview of this one; Cocoa closed the window, and
		//	now Carbon is telling this control to relinquish the focus
		//	as it's being disposed.  There's nothing to do.

		check(firstResponder==window);
	}
}

//----------------------------------------------------------------------------------
// ActiveStateChanged
//----------------------------------------------------------------------------------
//
static void
ActiveStateChanged( HIWebView* view )
{
	if ( [view->fWebView respondsToSelector:@selector(setEnabled)] )
	{
		[(NSControl*)view->fWebView setEnabled: IsControlEnabled( view->fViewRef )];
		HIViewSetNeedsDisplay( view->fViewRef, true );
	}
}


//----------------------------------------------------------------------------------
// ProcessCommand
//----------------------------------------------------------------------------------
//
static OSStatus
ProcessCommand( HIWebView* inView, const HICommand* inCommand )
{
	OSStatus		result = eventNotHandledErr;
	NSResponder*	resp;
	
	resp = [inView->fKitWindow firstResponder];

	if ( [resp isKindOfClass:[NSView class]] )
	{
		NSView*	respView = (NSView*)resp;

		if ( respView == inView->fWebView
			|| [respView isDescendantOf: inView->fWebView] )
		{
			switch ( inCommand->commandID )
			{
				case kHICommandCut:
				case kHICommandCopy:
				case kHICommandPaste:
				case kHICommandClear:
				case kHICommandSelectAll:
					{
						SEL selector = _NSSelectorForHICommand( inCommand );
						if ( [respView respondsToSelector:selector] )
						{
							[respView performSelector:selector withObject:nil];
							result = noErr;
						}
					}
					break;
			}
		}
	}
	
	return result;
}

//----------------------------------------------------------------------------------
// UpdateCommandStatus
//----------------------------------------------------------------------------------
//
static OSStatus
UpdateCommandStatus( HIWebView* inView, const HICommand* inCommand )
{
	OSStatus		result = eventNotHandledErr;
	MenuItemProxy* 	proxy = NULL;
	NSResponder*	resp;
	
	resp = [inView->fKitWindow firstResponder];
	
	if ( [resp isKindOfClass:[NSView class]] )
	{
		NSView*	respView = (NSView*)resp;

		if ( respView == inView->fWebView
			|| [respView isDescendantOf: inView->fWebView] )
		{
			if ( inCommand->attributes & kHICommandFromMenu )
			{
				SEL selector = _NSSelectorForHICommand( inCommand );
	
				if ( selector )
				{
					if ( [resp respondsToSelector: selector] )
					{
						proxy = [[MenuItemProxy alloc] initWithAction: selector];
						
                        // Can't use -performSelector:withObject: here because the method we're calling returns BOOL, while
                        // -performSelector:withObject:'s return value is assumed to be an id.
                        BOOL (*validationFunction)(id, SEL, id) = (BOOL (*)(id, SEL, id))objc_msgSend;
                        if (validationFunction(resp, @selector(validateUserInterfaceItem:), proxy))
							EnableMenuItem( inCommand->menu.menuRef, inCommand->menu.menuItemIndex );
						else
							DisableMenuItem( inCommand->menu.menuRef, inCommand->menu.menuItemIndex );
						
						result = noErr;
					}
				}
			}
		}
	}
	
	if ( proxy )
		[proxy release];

	return result;
}

// Blatantly stolen from AppKit and cropped a bit

//----------------------------------------------------------------------------------
// _NSSelectorForHICommand
//----------------------------------------------------------------------------------
//
static SEL
_NSSelectorForHICommand( const HICommand* inCommand )
{
    switch ( inCommand->commandID )
	{
        case kHICommandUndo: return @selector(undo:);
        case kHICommandRedo: return @selector(redo:);
        case kHICommandCut  : return @selector(cut:);
        case kHICommandCopy : return @selector(copy:);
        case kHICommandPaste: return @selector(paste:);
        case kHICommandClear: return @selector(delete:);
        case kHICommandSelectAll: return @selector(selectAll:);
        default: return NULL;
    }

    return NULL;
}


//-----------------------------------------------------------------------------------
//	HIWebViewEventHandler
//-----------------------------------------------------------------------------------
//	Our object's virtual event handler method. I'm not sure if we need this these days.
//	We used to do various things with it, but those days are long gone...
//
static OSStatus
HIWebViewEventHandler(
	EventHandlerCallRef	inCallRef,
	EventRef			inEvent,
	void *				inUserData )
{
	OSStatus			result = eventNotHandledErr;
	HIPoint				where;
	OSType				tag;
	void *				ptr;
	Size				size;
	UInt32				features;
	RgnHandle			region = NULL;
	ControlPartCode		part;
	HIWebView*			view = (HIWebView*)inUserData;

        // [NSApp setWindowsNeedUpdate:YES] must be called before events so that ActivateTSMDocument is called to set an active document. 
        // Without an active document, TSM will use a default document which uses a bottom-line input window which we don't want.
        [NSApp setWindowsNeedUpdate:YES];
        
	switch ( GetEventClass( inEvent ) )
	{
		case kEventClassHIObject:
			switch ( GetEventKind( inEvent ) )
			{
				case kEventHIObjectConstruct:
					{
						HIObjectRef		object;

						result = GetEventParameter( inEvent, kEventParamHIObjectInstance,
								typeHIObjectRef, NULL, sizeof( HIObjectRef ), NULL, &object );
						require_noerr( result, MissingParameter );
						
						// on entry for our construct event, we're passed the
						// creation proc we registered with for this class.
						// we use it now to create the instance, and then we
						// replace the instance parameter data with said instance
						// as type void.

						view = HIWebViewConstructor( (HIViewRef)object );

						if ( view )
						{
							SetEventParameter( inEvent, kEventParamHIObjectInstance,
									typeVoidPtr, sizeof( void * ), &view ); 
						}
					}
					break;
				
				case kEventHIObjectDestruct:
					HIWebViewDestructor( view );
					// result is unimportant
					break;
			}
			break;

		case kEventClassKeyboard:
			{
				NSEvent* kitEvent = WKCreateNSEventWithCarbonEvent(inEvent);
				[view->fKitWindow sendSuperEvent:kitEvent];
				[kitEvent release];
				result = noErr;
			}
			break;

		case kEventClassMouse:
			switch ( GetEventKind( inEvent ) )
			{
				case kEventMouseUp:
					result = MouseUp( view, inEvent );
					break;
				
				case kEventMouseWheelMoved:
					result = MouseWheelMoved( view, inEvent );
					break;

				case kEventMouseMoved:
					result = MouseMoved( view, inEvent );
					break;

				case kEventMouseDragged:
					result = MouseDragged( view, inEvent );
					break;
			}
			break;

		case kEventClassCommand:
			{
				HICommand		command;
				
				result = GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL,
								sizeof( HICommand ), NULL, &command );
				require_noerr( result, MissingParameter );
				
				switch ( GetEventKind( inEvent ) )
				{
					case kEventCommandProcess:
						result = ProcessCommand( view, &command );
						break;
					
					case kEventCommandUpdateStatus:
						result = UpdateCommandStatus( view, &command );
						break;
				}
			}
			break;

		case kEventClassControl:
			switch ( GetEventKind( inEvent ) )
			{
				case kEventControlInitialize:
					features = GetBehaviors();
					SetEventParameter( inEvent, kEventParamControlFeatures, typeUInt32,
							sizeof( UInt32 ), &features );
					result = noErr;
					break;
					
				case kEventControlDraw:
					{
						CGContextRef		context = NULL;
						
						GetEventParameter( inEvent, kEventParamRgnHandle, typeQDRgnHandle, NULL,
								sizeof( RgnHandle ), NULL, &region );
						GetEventParameter( inEvent, kEventParamCGContextRef, typeCGContextRef, NULL,
								sizeof( CGContextRef ), NULL, &context );

						Draw( view, region, context );

						result = noErr;
					}
					break;
				
				case kEventControlHitTest:
					GetEventParameter( inEvent, kEventParamMouseLocation, typeHIPoint, NULL,
							sizeof( HIPoint ), NULL, &where );
					part = HitTest( view, &where );
					SetEventParameter( inEvent, kEventParamControlPart, typeControlPartCode, sizeof( ControlPartCode ), &part );
					result = noErr;
					break;
					
				case kEventControlGetPartRegion:
					GetEventParameter( inEvent, kEventParamControlPart, typeControlPartCode, NULL,
							sizeof( ControlPartCode ), NULL, &part );
					GetEventParameter( inEvent, kEventParamControlRegion, typeQDRgnHandle, NULL,
							sizeof( RgnHandle ), NULL, &region );
					result = GetRegion( view, part, region );
					break;
				
				case kEventControlGetData:
					GetEventParameter(inEvent, kEventParamControlPart, typeControlPartCode, NULL, sizeof(ControlPartCode), NULL, &part);
					GetEventParameter(inEvent, kEventParamControlDataTag, typeEnumeration, NULL, sizeof(OSType), NULL, &tag);
					GetEventParameter(inEvent, kEventParamControlDataBuffer, typePtr, NULL, sizeof(Ptr), NULL, &ptr);
					GetEventParameter(inEvent, kEventParamControlDataBufferSize, typeByteCount, NULL, sizeof(Size), NULL, &size);

					if (tag == kControlKindTag) {
						Size outSize;
						result = noErr;

						if (ptr) {
							if (size != sizeof(ControlKind))
								result = errDataSizeMismatch;
							else
								(*(ControlKind *)ptr) = GetKind();
						}

						outSize = sizeof(ControlKind);
						SetEventParameter(inEvent, kEventParamControlDataBufferSize, typeByteCount, sizeof(Size), &outSize);
					}

					break;
				
				case kEventControlBoundsChanged:
					{
						HIRect		prevRect, currRect;
						UInt32		attrs;
						
						GetEventParameter( inEvent, kEventParamAttributes, typeUInt32, NULL,
								sizeof( UInt32 ), NULL, &attrs );
						GetEventParameter( inEvent, kEventParamOriginalBounds, typeHIRect, NULL,
								sizeof( HIRect ), NULL, &prevRect );
						GetEventParameter( inEvent, kEventParamCurrentBounds, typeHIRect, NULL,
								sizeof( HIRect ), NULL, &currRect );

						BoundsChanged( view, attrs, &prevRect, &currRect );
						result = noErr;
					}
					break;
				
				case kEventControlActivate:
					ActiveStateChanged( view );
					result = noErr;
					break;
					
				case kEventControlDeactivate:
					ActiveStateChanged( view );
					result = noErr;
					break;
															
				case kEventControlOwningWindowChanged:
					{
						WindowRef		fromWindow, toWindow;
						
						result = GetEventParameter( inEvent, kEventParamControlOriginalOwningWindow, typeWindowRef, NULL,
										sizeof( WindowRef ), NULL, &fromWindow );
						require_noerr( result, MissingParameter );

						result = GetEventParameter( inEvent, kEventParamControlCurrentOwningWindow, typeWindowRef, NULL,
										sizeof( WindowRef ), NULL, &toWindow );
						require_noerr( result, MissingParameter );

						OwningWindowChanged( view, fromWindow, toWindow );
						
						result = noErr;
					}
					break;
                                    
				case kEventControlClick:
					result = Click( view, inEvent );
					break;
                                    
				case kEventControlContextualMenuClick:
					result = ContextMenuClick( view, inEvent );
					break;
                                    
				case kEventControlSetFocusPart:
					{
						ControlPartCode		desiredFocus;
						RgnHandle			invalidRgn;
						Boolean				focusEverything;
						ControlPartCode		actualFocus;
						
						result = GetEventParameter( inEvent, kEventParamControlPart, typeControlPartCode, NULL,
										sizeof( ControlPartCode ), NULL, &desiredFocus ); 
						require_noerr( result, MissingParameter );
						
						GetEventParameter( inEvent, kEventParamControlInvalRgn, typeQDRgnHandle, NULL,
								sizeof( RgnHandle ), NULL, &invalidRgn );

						focusEverything = false; // a good default in case the parameter doesn't exist

						GetEventParameter( inEvent, kEventParamControlFocusEverything, typeBoolean, NULL,
								sizeof( Boolean ), NULL, &focusEverything );

						result = SetFocusPart( view, desiredFocus, invalidRgn, focusEverything, &actualFocus );
						
						if ( result == noErr )
							verify_noerr( SetEventParameter( inEvent, kEventParamControlPart, typeControlPartCode,
									sizeof( ControlPartCode ), &actualFocus ) );
					}
					break;
				
				// some other kind of Control event
				default:
					break;
			}
			break;
			
		// some other event class
		default:
			break;
	}

MissingParameter:
	return result;
}


static void UpdateObserver(CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info);

static void
StartUpdateObserver( HIWebView* view )
{
	CFRunLoopObserverContext	context;
	CFRunLoopObserverRef		observer;
    CFRunLoopRef				mainRunLoop;
    
    check( view->fIsComposited == false );
    check( view->fUpdateObserver == NULL );

	context.version = 0;
	context.info = view;
	context.retain = NULL;
	context.release = NULL;
	context.copyDescription = NULL;

    mainRunLoop = (CFRunLoopRef)GetCFRunLoopFromEventLoop( GetMainEventLoop() );
	observer = CFRunLoopObserverCreate( NULL, kCFRunLoopEntry | kCFRunLoopBeforeWaiting, true, 0, UpdateObserver, &context );
	CFRunLoopAddObserver( mainRunLoop, observer, kCFRunLoopCommonModes ); 

    view->fUpdateObserver = observer;
    
//    printf( "Update observer started\n" );
}

static void
StopUpdateObserver( HIWebView* view )
{
    check( view->fIsComposited == false );
    check( view->fUpdateObserver != NULL );

    CFRunLoopObserverInvalidate( view->fUpdateObserver );
    CFRelease( view->fUpdateObserver );
    view->fUpdateObserver = NULL;

//    printf( "Update observer removed\n" );
}

static void 
UpdateObserver( CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info )
{
	HIWebView*			view = (HIWebView*)info;
    RgnHandle			region = NewRgn();
    
//    printf( "Update observer called\n" );

    if ( region )
    {
        GetWindowRegion( GetControlOwner( view->fViewRef ), kWindowUpdateRgn, region );
        
        if ( !EmptyRgn( region ) )
        {
            RgnHandle		ourRgn = NewRgn();
            Rect			rect;
            
            GetWindowBounds( GetControlOwner( view->fViewRef ), kWindowStructureRgn, &rect );
            
//            printf( "Update region is non-empty\n" );
            
            if ( ourRgn )
            {
                Rect		rect;
                GrafPtr		savePort, port;
                Point		offset = { 0, 0 };
                
                port = GetWindowPort( GetControlOwner( view->fViewRef ) );
                
                GetPort( &savePort );
                SetPort( port );
                
                GlobalToLocal( &offset );
                OffsetRgn( region, offset.h, offset.v );

                GetControlBounds( view->fViewRef, &rect );
                RectRgn( ourRgn, &rect );
                
//                printf( "our control is at %d %d %d %d\n",
//                        rect.top, rect.left, rect.bottom, rect.right );
                
                GetRegionBounds( region, &rect );
//                printf( "region is at %d %d %d %d\n",
//                        rect.top, rect.left, rect.bottom, rect.right );

                SectRgn( ourRgn, region, ourRgn );
                
                GetRegionBounds( ourRgn, &rect );
//                printf( "intersection is  %d %d %d %d\n",
//                       rect.top, rect.left, rect.bottom, rect.right );
                if ( !EmptyRgn( ourRgn ) )
                {
                    RgnHandle	saveVis = NewRgn();
                    
//                    printf( "looks like we should draw\n" );

                    if ( saveVis )
                    {
//                        RGBColor	kRedColor = { 0xffff, 0, 0 };
                        
                        GetPortVisibleRegion( GetWindowPort( GetControlOwner( view->fViewRef ) ), saveVis );
                        SetPortVisibleRegion( GetWindowPort( GetControlOwner( view->fViewRef ) ), ourRgn );
                        
//                        RGBForeColor( &kRedColor );
//                        PaintRgn( ourRgn );
//                        QDFlushPortBuffer( port, NULL );
//                        Delay( 15, NULL );

                        Draw1Control( view->fViewRef );
                        ValidWindowRgn( GetControlOwner( view->fViewRef ), ourRgn );
                        
                        SetPortVisibleRegion( GetWindowPort( GetControlOwner( view->fViewRef ) ), saveVis );
                        DisposeRgn( saveVis );
                    }
                }

                SetPort( savePort );
                
                DisposeRgn( ourRgn );
            }
        }
        
        DisposeRgn( region );
    }
}

#endif