/*

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                this notice and the following text and disclaimers in all such redistributions of

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                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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*/

#import <CoreFoundation/CFDictionary.h>

#import "NSViewOverlays.h"

static CFMutableDictionaryRef _overlayViewDict = NULL;

@class OverlayHelperWindow;

@class OverlayHelperView;

@interface OverlayHelperWindow : NSWindow

{

    OverlayHelperView *helperView;

    NSView *parentView;

    NSWindowOrderingMode order;

}

- (id)initWithContentRect:(NSRect)contentRect styleMask:(unsigned int)aStyle

    backing:(NSBackingStoreType)bufferingType defer:(BOOL)flag

    parentView:(NSView *)aView helperView:(OverlayHelperView *)helper ordered:(NSWindowOrderingMode)place;

- (void)parentViewWillMoveToWindow:(NSWindow *)window;

- (void)parentViewDidMoveToWindow;

- (OverlayHelperView *)helperView;

@end

@interface OverlayHelperView : NSView

{

    OverlayHelperWindow *helperWindow;

}

- (void)setHelperWindow:(OverlayHelperWindow *)helper;

@end

@implementation NSView(OverlayView)

- (void)addOverlayView:(NSView *)theView ordered:(NSWindowOrderingMode)place

{

    NSMutableArray *overlayviews;

    OverlayHelperWindow *childWindow;

    OverlayHelperView *helperView;

    if(!_overlayViewDict)

        _overlayViewDict = CFDictionaryCreateMutable(NULL, 0, NULL, &kCFTypeDictionaryValueCallBacks);

    overlayviews = (NSMutableArray *)CFDictionaryGetValue(_overlayViewDict, self);

    if(!overlayviews)

    {

        overlayviews = [[NSMutableArray alloc] init];

        CFDictionarySetValue(_overlayViewDict, self, overlayviews);

        [overlayviews release];

    }

    [overlayviews addObject:theView];

    // Add a special NSView to the parent so we can track a few things...

    helperView = [[OverlayHelperView alloc] initWithFrame:NSMakeRect(0,0,0,0)];

    childWindow = [[OverlayHelperWindow alloc] 

        initWithContentRect:NSMakeRect(-10000,-10000,1,1)

        styleMask:NSBorderlessWindowMask

        backing:NSBackingStoreBuffered

        defer:NO

        parentView:self

        helperView:helperView

        ordered:place];

    [childWindow setContentView:theView];

    [helperView setHelperWindow:childWindow];

    [self addSubview:helperView];

    [helperView release];

    [childWindow display];

}

- (void)removeOverlayView:(NSView *)theView

{

    NSMutableArray *overlayviews;

    OverlayHelperWindow *childWindow;

    OverlayHelperView *helperView;

    if(!_overlayViewDict)

        return;

    overlayviews = (NSMutableArray *)CFDictionaryGetValue(_overlayViewDict, self);

    if(!overlayviews)

        return;

    [overlayviews removeObject:theView];

    // Grab helper window and helper views

    childWindow = (OverlayHelperWindow *)[theView window];

    helperView = [childWindow helperView];

    [helperView removeFromSuperview];

    [childWindow release];

    if([overlayviews count] == 0)

            CFDictionaryRemoveValue(_overlayViewDict, self);

    [self setNeedsDisplay:YES];

}

@end

@implementation OverlayHelperView

- (void)setHelperWindow:(OverlayHelperWindow *)theWindow

{

    helperWindow = theWindow;

}

- (void)viewWillMoveToWindow:(NSWindow *)theWindow

{

    [helperWindow parentViewWillMoveToWindow:theWindow];

}

- (void)viewDidMoveToWindow

{

    [helperWindow parentViewDidMoveToWindow];

}

@end

@implementation OverlayHelperWindow

- (void)parentViewChanged:(NSNotification *)note

{

    NSRect viewRect, windowRect;

    viewRect = [parentView convertRect:[parentView bounds] toView:nil];

    windowRect = [[helperView window] frame];

    viewRect.origin.x += windowRect.origin.x;

    viewRect.origin.y += windowRect.origin.y;

    [self setFrame:viewRect display:YES];

}

- (void)parentViewWillMoveToWindow:(NSWindow *)window

{

    if(!window && window != [self parentWindow])

    {

        NSView *overlayView = [self contentView];

        if([overlayView respondsToSelector:@selector(viewWillResignOverlay)])

            [overlayView viewWillResignOverlay];

        [[self parentWindow] removeChildWindow:self];

        if([overlayView respondsToSelector:@selector(viewDidResignOverlay)])

            [overlayView viewDidResignOverlay];

    }

}

- (void)parentViewDidMoveToWindow

{

    NSView *overlayView = [self contentView];

    if([helperView window])

    {

        if([overlayView respondsToSelector:@selector(viewWillBecomeOverlay)])

            [overlayView viewWillBecomeOverlay];

        [[helperView window] addChildWindow:self ordered:order];

        if([[helperView window] isVisible])

            [self orderFront:nil];

        [self parentViewChanged:nil];

        if([overlayView respondsToSelector:@selector(viewDidBecomeOverlay)])

            [overlayView viewDidBecomeOverlay];

    }

}

- (id)initWithContentRect:(NSRect)contentRect styleMask:(unsigned int)aStyle

    backing:(NSBackingStoreType)bufferingType defer:(BOOL)flag

    parentView:(NSView *)aView helperView:(OverlayHelperView *)helper ordered:(NSWindowOrderingMode)place

{

    if(self = [super initWithContentRect:contentRect styleMask:aStyle

            backing:bufferingType defer:flag])

    {

        parentView = aView;

        helperView = helper;

        order = place;

        [self setOpaque:NO];

        [self setAlphaValue:.999];

        [self setIgnoresMouseEvents:YES];

        // Ask to get notifications when our parent view's

        // frame changes.

        [[NSNotificationCenter defaultCenter]

            addObserver:self

            selector:@selector(parentViewChanged:)

            name:NSViewFrameDidChangeNotification

            object:aView];

    }

    return self;

}

- (OverlayHelperView *)helperView

{

    return helperView;

}

@end