/*

     File: ATPopupWindow.m

 Abstract:  A custom NSWindow that mainly implements a "popup" animation using CoreAnimation.

  Version: 1.1

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 */

#import <QuartzCore/QuartzCore.h>

#import "ATPopupWindow.h"

#define GROW_ANIMATION_DURATION 0.20

#define GROW_SCALE 1.25

#define SHRINK_ANIMATION_DURATION 0.10

#define SHRINK_SCALE 0.80

#define RESTORE_ANIMATION_DURATION 0.10

@implementation ATPopupWindow

- (void)_cleanupAndRestoreViews {

    // Swap back the content view

    if (_oldContentView != nil) {

        // We disable screen updates to avoid any flashing that might happening when one

        // layer backed view goes away and another regular view replaces it.

        //

        NSDisableScreenUpdates();

        [self setFrame:_originalWidowFrame display:NO];

        [self setContentView:_oldContentView];

        [_oldContentView release];

        _oldContentView = nil;

        [self makeFirstResponder:_oldFirstResponder];

        _oldFirstResponder = nil;

        [_animationView release];

        _animationView = nil;

        _animationLayer = nil; // Non retained

        NSEnableScreenUpdates();

    }

    _shrinking = NO;

    _growing = NO;

}

- (CATransform3D)_transformForScale:(CGFloat)scale {

    if (scale == 1.0) {

        return CATransform3DIdentity;

    } else {

        // Start at the scale percentage

        CATransform3D scaleTransform = CATransform3DScale(CATransform3DIdentity, scale, scale, 1.0);

        // Create a translation to make us popup from somewhere other than the center

        CGFloat yTrans = NSHeight(_originalLayerFrame)/2.0 - (NSHeight(_originalLayerFrame)*scale)/2.0;

        CGFloat xTrans = 0; // No X translating -- we popup from the X center

        CATransform3D translateTransform = CATransform3DTranslate(CATransform3DIdentity, xTrans, yTrans, 1.0);

        return CATransform3DConcat(scaleTransform, translateTransform);

    }

}

- (void)_addAnimationToScale:(CGFloat)scale duration:(NSTimeInterval)duration {

    CABasicAnimation *transformAni = [CABasicAnimation animation];

    transformAni.fromValue = [NSValue valueWithCATransform3D:_animationLayer.transform];

    transformAni.duration = duration;

    // We make ourselves the delegate to get notified when the animation ends

    transformAni.delegate = self;

    // Set the final "toValue" for the animation and the layer contents. 

    // At the end of the animation it is left at this value, which is what we want

    _animationLayer.transform = [self _transformForScale:scale];

    [_animationLayer addAnimation:transformAni forKey:@"transform"];

}

// Chain several animations together -- one starting at the end of the other

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {

    if (!flag) {

        _animationLayer.transform = [self _transformForScale:1.0];

        [self _cleanupAndRestoreViews];

    } else if (_growing) {

        _growing = NO;

        _shrinking = YES;

        [self _addAnimationToScale:SHRINK_SCALE duration:SHRINK_ANIMATION_DURATION];

    } else if (_shrinking) {

        _shrinking = NO;

        [self _addAnimationToScale:1.0 duration:RESTORE_ANIMATION_DURATION];

    } else {

        [self _cleanupAndRestoreViews];

    }

}

// Our window doesn't have a title bar or a resize bar, but we want it to still become key.

// However, we want the tableview to draw as the first responder even when the window

// isn't key. So, we return NO when we are drawing to work around that.

//

- (BOOL)canBecomeKeyWindow {

    if (_pretendKeyForDrawing) return NO;

    return YES;

}

// The scrollers always draw blue if they are in a key window.

// Temporarily tell them that our window is key for caching the proper image.

//

- (BOOL)isKeyWindow {

    if (_pretendKeyForDrawing) return YES;

    return [super isKeyWindow];

}

- (void)popup {

    // Stop any existing animations

    if (_animationView != nil) {

        [_animationLayer removeAllAnimations];

        [self _cleanupAndRestoreViews];

    }

    // Perform some initial setup - hide the window and make us not have a shadow while animating

    if ([self isVisible]) {

        [self orderOut:nil];

    }

    // Grab the content view and cache its contents

    _oldContentView = [[self contentView] retain];

    // We also want to restore the current first responder

    _oldFirstResponder = [self firstResponder];

    _pretendKeyForDrawing = YES;

    NSRect visibleRect = [_oldContentView visibleRect];

    NSBitmapImageRep *imageRep = [_oldContentView bitmapImageRepForCachingDisplayInRect:visibleRect];

    [_oldContentView cacheDisplayInRect:visibleRect toBitmapImageRep:imageRep];

    _pretendKeyForDrawing = NO;

    // Create a new content view for animating

    _animationView = [[NSView alloc] initWithFrame:visibleRect];

    [_animationView setWantsLayer:YES];

    [self setContentView:_animationView];

    // Temporarily enlargen the window size to accomidate the "grow" animation.

    _originalWidowFrame = self.frame;

    CGFloat xGrow = NSWidth(_originalWidowFrame)*0.5;

    CGFloat yGrow = NSHeight(_originalWidowFrame)*0.5;

    [self setFrame:NSInsetRect(_originalWidowFrame, -xGrow, -yGrow) display:NO];

    // Calculate where we want the animation layer to be based off of the offset we set above

    _originalLayerFrame = visibleRect;

    _originalLayerFrame.origin.x += xGrow;

    _originalLayerFrame.origin.y += yGrow;

    // Create a manual layer and control it's contents and position

    _animationLayer = [CALayer layer];

    _animationLayer.frame = NSRectToCGRect(_originalLayerFrame);

    _animationLayer.contents = (id)[imageRep CGImage];

    // A shadow is needed to match what the window normally has

    _animationLayer.shadowOpacity = 0.50;

    _animationLayer.shadowRadius = 4;

    // Start at 1% scale

    _animationLayer.transform = [self _transformForScale:0.01];

    // Get the layer into the rendering tree

    [[_animationView layer] addSublayer:_animationLayer];

    // Bring the window up and flush the contents

    [self makeKeyAndOrderFront:nil];

    [self displayIfNeeded];

    // Start the grow animation

    _growing = YES;

    [self _addAnimationToScale:GROW_SCALE duration:GROW_ANIMATION_DURATION];

}

@end