netsurf/cocoa/PSMTabBarControl/PSMRolloverButton.m

//
//  PSMOverflowPopUpButton.m
//  NetScrape
//
//  Created by John Pannell on 8/4/04.
//  Copyright 2004 Positive Spin Media. All rights reserved.
//

#import "PSMRolloverButton.h"

@implementation PSMRolloverButton

- (void)awakeFromNib {
	if([[self superclass] instancesRespondToSelector:@selector(awakeFromNib)]) {
		[super awakeFromNib];
	}

	[[NSNotificationCenter defaultCenter] addObserver:self
	 selector:@selector(rolloverFrameDidChange:)
	 name:NSViewFrameDidChangeNotification
	 object:self];
	[self setPostsFrameChangedNotifications:YES];
	[self resetCursorRects];

	_myTrackingRectTag = -1;
}

- (void)dealloc {
	[[NSNotificationCenter defaultCenter] removeObserver:self];

	[self removeTrackingRect];

	[super dealloc];
}

// the regular image
- (void)setUsualImage:(NSImage *)newImage {
	[newImage retain];
	[_usualImage release];
	_usualImage = newImage;

	[self setImage:_usualImage];
}

- (NSImage *)usualImage {
	return _usualImage;
}

- (void)setRolloverImage:(NSImage *)newImage {
	[newImage retain];
	[_rolloverImage release];
	_rolloverImage = newImage;
}

- (NSImage *)rolloverImage {
	return _rolloverImage;
}

//Remove old tracking rects when we change superviews
- (void)viewWillMoveToSuperview:(NSView *)newSuperview {
	[self removeTrackingRect];

	[super viewWillMoveToSuperview:newSuperview];
}

- (void)viewDidMoveToSuperview {
	[super viewDidMoveToSuperview];

	[self resetCursorRects];
}

- (void)viewWillMoveToWindow:(NSWindow *)newWindow {
	[self removeTrackingRect];

	[super viewWillMoveToWindow:newWindow];
}

- (void)viewDidMoveToWindow {
	[super viewDidMoveToWindow];

	[self resetCursorRects];
}

- (void)rolloverFrameDidChange:(NSNotification *)inNotification {
	[self resetCursorRects];
}

- (void)addTrackingRect {
	// assign a tracking rect to watch for mouse enter/exit
	NSRect trackRect = [self bounds];
	NSPoint localPoint = [self convertPoint:[[self window] convertScreenToBase:[NSEvent mouseLocation]]
						  fromView:nil];
	BOOL mouseInside = NSPointInRect(localPoint, trackRect);

	_myTrackingRectTag = [self addTrackingRect:trackRect owner:self userData:nil assumeInside:mouseInside];
	if(mouseInside) {
		[self mouseEntered:nil];
	} else{
		[self mouseExited:nil];
	}
}

- (void)removeTrackingRect {
	if(_myTrackingRectTag != -1) {
		[self removeTrackingRect:_myTrackingRectTag];
	}
	_myTrackingRectTag = -1;
}

// override for rollover effect
- (void)mouseEntered:(NSEvent *)theEvent;
{
	// set rollover image
	[self setImage:_rolloverImage];

	[super mouseEntered:theEvent];
}

- (void)mouseExited:(NSEvent *)theEvent;
{
	// restore usual image
	[self setImage:_usualImage];

	[super mouseExited:theEvent];
}

- (void)resetCursorRects {
	// called when the button rect has been changed
	[self removeTrackingRect];
	[self addTrackingRect];
}

- (void)setFrame:(NSRect)rect {
	[super setFrame:rect];
	[self resetCursorRects];
}

- (void)setBounds:(NSRect)rect {
	[super setBounds:rect];
	[self resetCursorRects];
}

#pragma mark -
#pragma mark Archiving

- (void)encodeWithCoder:(NSCoder *)aCoder {
	[super encodeWithCoder:aCoder];
	if([aCoder allowsKeyedCoding]) {
		[aCoder encodeObject:_rolloverImage forKey:@"rolloverImage"];
		[aCoder encodeObject:_usualImage forKey:@"usualImage"];
		[aCoder encodeInt64:_myTrackingRectTag forKey:@"myTrackingRectTag"];
	}
}

- (id)initWithCoder:(NSCoder *)aDecoder {
	self = [super initWithCoder:aDecoder];
	if(self) {
		if([aDecoder allowsKeyedCoding]) {
			_rolloverImage = [[aDecoder decodeObjectForKey:@"rolloverImage"] retain];
			_usualImage = [[aDecoder decodeObjectForKey:@"usualImage"] retain];
			_myTrackingRectTag = [aDecoder decodeInt64ForKey:@"myTrackingRectTag"];
		}
	}
	return self;
}


@end