//
//  PSMOverflowPopUpButton.m
//  PSMTabBarControl
//
//  Created by John Pannell on 11/4/05.
//  Copyright 2005 Positive Spin Media. All rights reserved.
//

#import "PSMOverflowPopUpButton.h"
#import "PSMTabBarControl.h"

#define TIMER_INTERVAL 1.0 / 15.0
#define ANIMATION_STEP 0.033f

@implementation PSMOverflowPopUpButton

- (id)initWithFrame:(NSRect)frameRect pullsDown:(BOOL)flag {
	if ((self = [super initWithFrame:frameRect pullsDown:YES]) != nil) {
		[self setBezelStyle:NSRegularSquareBezelStyle];
		[self setBordered:NO];
		[self setTitle:@""];
		[self setPreferredEdge:NSMaxXEdge];
		_PSMTabBarOverflowPopUpImage = [[NSImage alloc] initByReferencingFile:[[PSMTabBarControl bundle] pathForImageResource:@"overflowImage"]];
		_PSMTabBarOverflowDownPopUpImage = [[NSImage alloc] initByReferencingFile:[[PSMTabBarControl bundle] pathForImageResource:@"overflowImagePressed"]];
		_animatingAlternateImage = NO;
	}
	return self;
}

- (void)dealloc {
	[_PSMTabBarOverflowPopUpImage release];
	[_PSMTabBarOverflowDownPopUpImage release];
	[super dealloc];
}

- (void)drawRect:(NSRect)rect {
	if(_PSMTabBarOverflowPopUpImage == nil) {
		[super drawRect:rect];
		return;
	}

	NSImage *image = (_down) ? _PSMTabBarOverflowDownPopUpImage : _PSMTabBarOverflowPopUpImage;
	NSSize imageSize = [image size];
	NSRect bounds = [self bounds];

	NSPoint drawPoint = NSMakePoint(NSMidX(bounds) - (imageSize.width * 0.5f), NSMidY(bounds) - (imageSize.height * 0.5f));

	if([self isFlipped]) {
		drawPoint.y += imageSize.height;
	}

	[image compositeToPoint:drawPoint operation:NSCompositeSourceOver fraction:(_animatingAlternateImage ? 0.7f : 1.0f)];

	if(_animatingAlternateImage) {
		NSImage *alternateImage = [self alternateImage];
		NSSize altImageSize = [alternateImage size];
		drawPoint = NSMakePoint(NSMidX(bounds) - (altImageSize.width * 0.5f), NSMidY(bounds) - (altImageSize.height * 0.5f));

		if([self isFlipped]) {
			drawPoint.y += altImageSize.height;
		}

		[[self alternateImage] compositeToPoint:drawPoint operation:NSCompositeSourceOver fraction:sin(_animationValue * M_PI)];
	}
}

- (void)mouseDown:(NSEvent *)event {
	_down = YES;
	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notificationReceived:) name:NSMenuDidEndTrackingNotification object:[self menu]];
	[self setNeedsDisplay:YES];
	[super mouseDown:event];
}

- (void)setHidden:(BOOL)value {
	if([self isHidden] != value) {
		if(value) {
			// Stop any animating alternate image if we hide
			[_animationTimer invalidate], _animationTimer = nil;
		} else if(_animatingAlternateImage) {
			// Restart any animating alternate image if we unhide
			_animationValue = ANIMATION_STEP;
			_animationTimer = [NSTimer scheduledTimerWithTimeInterval:TIMER_INTERVAL target:self selector:@selector(animateStep:) userInfo:nil repeats:YES];
			[[NSRunLoop currentRunLoop] addTimer:_animationTimer forMode:NSEventTrackingRunLoopMode];
		}
	}

	[super setHidden:value];
}

- (void)notificationReceived:(NSNotification *)notification {
	_down = NO;
	[self setNeedsDisplay:YES];
	[[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)setAnimatingAlternateImage:(BOOL)flag {
	if(_animatingAlternateImage != flag) {
		_animatingAlternateImage = flag;

		if(![self isHidden]) {
			if(flag) {
				_animationValue = ANIMATION_STEP;
				_animationTimer = [NSTimer scheduledTimerWithTimeInterval:TIMER_INTERVAL target:self selector:@selector(animateStep:) userInfo:nil repeats:YES];
				[[NSRunLoop currentRunLoop] addTimer:_animationTimer forMode:NSEventTrackingRunLoopMode];
			} else {
				[_animationTimer invalidate], _animationTimer = nil;
			}

			[self setNeedsDisplay:YES];
		}
	}
}

- (BOOL)animatingAlternateImage;
{
	return _animatingAlternateImage;
}

- (void)animateStep:(NSTimer *)timer {
	_animationValue += ANIMATION_STEP;

	if(_animationValue >= 1) {
		_animationValue = ANIMATION_STEP;
	}

	[self setNeedsDisplay:YES];
}

#pragma mark -
#pragma mark Archiving

- (void)encodeWithCoder:(NSCoder *)aCoder {
	[super encodeWithCoder:aCoder];
	if([aCoder allowsKeyedCoding]) {
		[aCoder encodeObject:_PSMTabBarOverflowPopUpImage forKey:@"PSMTabBarOverflowPopUpImage"];
		[aCoder encodeObject:_PSMTabBarOverflowDownPopUpImage forKey:@"PSMTabBarOverflowDownPopUpImage"];
		[aCoder encodeBool:_animatingAlternateImage forKey:@"PSMTabBarOverflowAnimatingAlternateImage"];
	}
}

- (id)initWithCoder:(NSCoder *)aDecoder {
	if((self = [super initWithCoder:aDecoder])) {
		if([aDecoder allowsKeyedCoding]) {
			_PSMTabBarOverflowPopUpImage = [[aDecoder decodeObjectForKey:@"PSMTabBarOverflowPopUpImage"] retain];
			_PSMTabBarOverflowDownPopUpImage = [[aDecoder decodeObjectForKey:@"PSMTabBarOverflowDownPopUpImage"] retain];
			[self setAnimatingAlternateImage:[aDecoder decodeBoolForKey:@"PSMTabBarOverflowAnimatingAlternateImage"]];
		}
	}
	return self;
}

@end