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//
// NSWindow+Fade.m
// TalkingMoose
//
// Created by Uli Kusterer on 22.06.05.
// Copyright 2005 Uli Kusterer.
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//

#import "NSWindow+Fade.h"
#import "UKHelperMacros.h"

static NSMutableDictionary* pendingFades = nil;


@implementation NSWindow (UKFade)

-(void) fadeInWithDuration: (NSTimeInterval)duration
{
    if( !pendingFades )
        pendingFades = [[NSMutableDictionary alloc] init];
    
    NSString* key = [NSString stringWithFormat: @"%p", self];
    NSDictionary* fade = [pendingFades objectForKey: key];
    
    if( fade ) // Currently fading that window? Abort that fade:
        [[fade objectForKey: @"timer"] invalidate]; // No need to remove from pendingFades, we'll replace it in a moment.
    
    [self setAlphaValue: 0];
    [self orderFront: nil];
    
    NSTimeInterval interval = duration / 0.1;
    float stepSize = 1 / interval;
    NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval: 0.1 // scheduled since we also want "normal" run loop mode.
                                target: self selector: @selector(fadeInOneStep:)
                                userInfo: nil repeats: YES];
    [[NSRunLoop currentRunLoop] addTimer: timer forMode: NSModalPanelRunLoopMode];
    [[NSRunLoop currentRunLoop] addTimer: timer forMode: NSEventTrackingRunLoopMode];
    [pendingFades setObject: [NSMutableDictionary dictionaryWithObjectsAndKeys: timer, @"timer",
                                                [NSNumber numberWithFloat: stepSize], @"stepSize",
                                                nil] forKey: key]; // Releases of any old fades.
}


-(void) fadeInOneStep: (NSTimer*)timer
{
    NSString* key = [NSString stringWithFormat: @"%p", self];
    float newAlpha = [self alphaValue] + [[[pendingFades objectForKey: key] objectForKey: @"stepSize"] floatValue];
    
    if( newAlpha >= 1.0 )
    {
        newAlpha = 1;
        [timer invalidate];
        [pendingFades removeObjectForKey: key];
    }
    
    //UKLog(@"Fading in: %f", newAlpha);
    [self setAlphaValue: newAlpha];
}


-(void) fadeOutWithDuration: (NSTimeInterval)duration
{
    if( !pendingFades )
        pendingFades = [[NSMutableDictionary alloc] init];
    
    NSString* key = [NSString stringWithFormat: @"%p", self];
    NSDictionary* fade = [pendingFades objectForKey: key];
    
    if( fade ) // Currently fading that window? Abort that fade:
        [[fade objectForKey: @"timer"] invalidate]; // No need to remove from pendingFades, we'll replace it in a moment.
    
    [self setAlphaValue: 1.0];
    
    NSTimeInterval interval = duration / 0.1;
    float stepSize = 1 / interval;
    NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval: 0.1 // scheduled since we also want "normal" run loop mode.
                                target: self selector: @selector(fadeOutOneStep:)
                                userInfo: nil repeats: YES];
    [pendingFades setObject: [NSMutableDictionary dictionaryWithObjectsAndKeys: timer, @"timer",
                                                [NSNumber numberWithFloat: stepSize], @"stepSize",
                                                nil] forKey: key]; // Releases of any old fades.
    [[NSRunLoop currentRunLoop] addTimer: timer forMode: NSModalPanelRunLoopMode];
    [[NSRunLoop currentRunLoop] addTimer: timer forMode: NSEventTrackingRunLoopMode];
}

-(void) fadeOutOneStep: (NSTimer*)timer
{
    NSString* key = [NSString stringWithFormat: @"%p", self];
NSMutableDictionary* currFadeDict = [[[pendingFades objectForKey: key] retain] autorelease]; // Make sure it doesn't go away in case we're cross-fading layers.
    float newAlpha = [self alphaValue] - [[currFadeDict objectForKey: @"stepSize"] floatValue];
    
    if( newAlpha <= 0 )
    {
        [timer invalidate];

[pendingFades removeObjectForKey: key];

NSNumber* newLevel = [currFadeDict objectForKey: @"newLevel"];
if( newLevel )
{
NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval: 0.1 // scheduled since we also want "normal" run loop mode.
                                target: self selector: @selector(fadeInOneStep:)
                                userInfo: nil repeats: YES];
[currFadeDict setObject: timer forKey: @"timer"];
[pendingFades setObject: currFadeDict forKey: key];
[[NSRunLoop currentRunLoop] addTimer: timer forMode: NSModalPanelRunLoopMode];
[[NSRunLoop currentRunLoop] addTimer: timer forMode: NSEventTrackingRunLoopMode];

[self setLevel: [newLevel intValue]];
//UKLog(@"Changing level to %u", [newLevel unsignedIntValue]);

newAlpha = 0;
}
else
{
newAlpha = 1; // Make opaque again so non-fading showing of window doesn't look unsuccessful.
[self orderOut: nil]; // Hide so setAlphaValue below doesn't cause window to fade out, then pop in again.
}
    }

//UKLog(@"Fading out: %f", newAlpha); // DEBUG ONLY!
[self setAlphaValue: newAlpha];
}


-(void) fadeToLevel: (int)lev withDuration: (NSTimeInterval)duration
{
    if( !pendingFades )
        pendingFades = [[NSMutableDictionary alloc] init];
    
    NSString* key = [NSString stringWithFormat: @"%p", self];
    NSDictionary* fade = [pendingFades objectForKey: key];
    
    if( fade ) // Currently fading that window? Abort that fade:
        [[fade objectForKey: @"timer"] invalidate]; // No need to remove from pendingFades, we'll replace it in a moment.
    
    [self setAlphaValue: 1.0];
    
    NSTimeInterval interval = (duration /2) / 0.1;
    float stepSize = 1 / interval;
    NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval: 0.1 // scheduled since we also want "normal" run loop mode.
                                target: self selector: @selector(fadeOutOneStep:)
                                userInfo: nil repeats: YES];
    [pendingFades setObject: [NSMutableDictionary dictionaryWithObjectsAndKeys: timer, @"timer",
                                                [NSNumber numberWithFloat: stepSize], @"stepSize",
                                                [NSNumber numberWithInt: lev], @"newLevel",
                                                nil] forKey: key]; // Releases of any old fades.
    [[NSRunLoop currentRunLoop] addTimer: timer forMode: NSModalPanelRunLoopMode];
    [[NSRunLoop currentRunLoop] addTimer: timer forMode: NSEventTrackingRunLoopMode];
}


@end
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