//

//  GGBLayer.m

//  GGB-iPhone

//

//  Created by Jens Alfke on 3/7/08.

//  Copyright 2008 __MyCompanyName__. All rights reserved.

//

#import "GGBLayer.h"

#import "QuartzUtils.h"

#import "GGBUtils.h"

NSString* const GGBLayerStyleChangedNotification = @"GGBLayerStyleChanged";

@implementation GGBLayer

- (NSString*) description

{

    return [NSString stringWithFormat: @"%@[(%g,%g)]", self.class,self.position.x,self.position.y];

}

- (void) redisplayAll

{

    [self setNeedsDisplay];

    for( CALayer *layer in self.sublayers )

        if( [layer isKindOfClass: [GGBLayer class]] )

            ((GGBLayer*)layer).redisplayAll;

        else

            [layer setNeedsDisplay];

}

/*

- (void)addAnimation:(CAAnimation *)anim forKey:(NSString *)key 

{

    NSLog(@"%@[%p] addAnimation: %p forKey: %@",[self class],self,anim,key);

    [super addAnimation: anim forKey: key];

}

*/

- (void) animateAndBlock: (NSString*)keyPath from: (id)from to: (id)to duration: (NSTimeInterval)duration

{

    //WARNING: This code works, but is a mess. I hope to find a better way to do this. --Jens 3/16/08

    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath: keyPath];

    anim.duration= duration;

    anim.fromValue = from;

    anim.toValue = to;

    anim.isRemovedOnCompletion = YES;

    anim.delegate = self;

    [self addAnimation:anim forKey: @"animateAndBlock:"];

    _curAnimation = (id)[self animationForKey: @"animateAndBlock:"];

    [self setValue: to forKeyPath: keyPath];    // animation doesn't update the property value

    // Now wait for it to finish:

    while( _curAnimation ) {

        [[NSRunLoop currentRunLoop] runMode: NSDefaultRunLoopMode//NSEventTrackingRunLoopMode

                                 beforeDate: [NSDate dateWithTimeIntervalSinceNow: 0.1]];

    }

}

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

{

    if( anim==_curAnimation ) {

        _curAnimation = nil;

    }

}

- (void) setStyle: (NSDictionary*)style

{

    if( style != _styleDict ) {

        if( _styleDict )

            [[NSNotificationCenter defaultCenter] removeObserver: self 

                                                            name: GGBLayerStyleChangedNotification

                                                          object: _styleDict];

        if( style )

            [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(_styleChanged)

                                                         name: GGBLayerStyleChangedNotification

                                                       object: style];

        setObj(&_styleDict,style);

    }

    [super setStyle: style];

}

- (void) _styleChanged

{

    // Reapply the style, so any changes in the dict will take effect.

    [super setStyle: _styleDict];

}

- (void) dealloc

{

    if( _styleDict )

        [[NSNotificationCenter defaultCenter] removeObserver: self

                                                        name: GGBLayerStyleChangedNotification

                                                      object: _styleDict];

    [super dealloc];

}

- (void) setValue: (id)value ofStyleProperty: (NSString*)prop

{

    if( _styleDict ) {

        id oldValue = [_styleDict objectForKey: prop];

        if( oldValue != value ) {

            if( value )

                [_styleDict setObject: value forKey: prop];

            else

                [_styleDict removeObjectForKey: prop];

            [[NSNotificationCenter defaultCenter] postNotificationName: GGBLayerStyleChangedNotification

                                                                object: _styleDict];

        }

    } else

        [self setValue: value forKey: prop];

}

#if TARGET_OS_IPHONE

#pragma mark -

#pragma mark IPHONE VERSION:

- (id) copyWithZone: (NSZone*)zone

{

    GGBLayer *clone = [[[self class] alloc] init];

    clone.bounds = self.bounds;

    clone.position = self.position;

    clone.zPosition = self.zPosition;

    clone.anchorPoint = self.anchorPoint;

    clone.transform = self.transform;

    clone.hidden = self.hidden;

    clone.doubleSided = self.doubleSided;

    clone.sublayerTransform = self.sublayerTransform;

    clone.masksToBounds = self.masksToBounds;

    clone.contents = self.contents;                 // doesn't copy contents (shallow-copy)

    clone.contentsRect = self.contentsRect;

    clone.contentsGravity = self.contentsGravity;

    clone.minificationFilter = self.minificationFilter;

    clone.magnificationFilter = self.magnificationFilter;

    clone.opaque = self.opaque;

    clone.needsDisplayOnBoundsChange = self.needsDisplayOnBoundsChange;

    clone.edgeAntialiasingMask = self.edgeAntialiasingMask;

    clone.backgroundColor = self.backgroundColor;

    clone.opacity = self.opacity;

    clone.compositingFilter = self.compositingFilter;

    clone.filters = self.filters;

    clone.backgroundFilters = self.backgroundFilters;

    clone.actions = self.actions;

    clone.name = self.name;

    clone.style = self.style;

    clone.cornerRadius = self.cornerRadius;

    clone.borderWidth = self.borderWidth;

    clone.borderColor = self.borderColor;

    for( GGBLayer *sublayer in self.sublayers ) {

        sublayer = [sublayer copyWithZone: zone];

        [clone addSublayer: sublayer];

    }

    return clone;

}

- (CGFloat) cornerRadius    {return _cornerRadius;}

- (CGFloat) borderWidth     {return _borderWidth;}

- (CGColorRef) backgroundColor {return _realBGColor;}

- (CGColorRef) borderColor  {return _borderColor;}

- (void) setCornerRadius: (CGFloat)r

{

    if( r != _cornerRadius ) {

        _cornerRadius = r;

        [self setNeedsDisplay];

    }

}

- (void) setBorderWidth: (CGFloat)w

{

    if( w != _borderWidth ) {

        _borderWidth = w;

        self.needsDisplayOnBoundsChange = (_borderWidth>0.0 && _borderColor!=NULL);

        [self setNeedsDisplay];

    }

}

- (void) setBackgroundColor: (CGColorRef)color

{

    if( color != _realBGColor ) {

        CGColorRelease(_realBGColor);

        _realBGColor = CGColorRetain(color);

        [self setNeedsDisplay];

    }

}

- (void) setBorderColor: (CGColorRef)color

{

    if( color != _borderColor ) {

        CGColorRelease(_borderColor);

        _borderColor = CGColorRetain(color);

        self.needsDisplayOnBoundsChange = (_borderWidth>0.0 && _borderColor!=NULL);

        [self setNeedsDisplay];

    }

}

- (void)drawInContext:(CGContextRef)ctx

{

    [super drawInContext: ctx];

    CGContextSaveGState(ctx);

    if( _realBGColor ) {

        CGRect interior = CGRectInset(self.bounds, _borderWidth,_borderWidth);

        CGContextSetFillColorWithColor(ctx, _realBGColor);

        if( _cornerRadius <= 0.0 ) {

            CGContextFillRect(ctx,interior);

        } else {

            CGContextBeginPath(ctx);

            AddRoundRect(ctx,interior,_cornerRadius);

            CGContextFillPath(ctx);

        }

    }

    if( _borderWidth > 0.0 && _borderColor!=NULL ) {

        CGRect border = CGRectInset(self.bounds, _borderWidth/2.0, _borderWidth/2.0);

        CGContextSetStrokeColorWithColor(ctx, _borderColor);

        CGContextSetLineWidth(ctx, _borderWidth);

        if( _cornerRadius <= 0.0 ) {

            CGContextStrokeRect(ctx,border);

        } else {

            CGContextBeginPath(ctx);

            AddRoundRect(ctx,border,_cornerRadius);

            CGContextStrokePath(ctx);

        }

    }

    CGContextRestoreGState(ctx);

}

#else

#pragma mark -

#pragma mark MAC OS VERSION:

- (id) copyWithZone: (NSZone*)zone

{

    // NSLayer isn't copyable, but it is archivable. So create a copy by archiving to

    // a temporary data block, then unarchiving a new layer from that block.

    // One complication is that, due to a bug in Core Animation, CALayer can't archive

    // a pattern-based CGColor. So as a workaround, clear the background before archiving,

    // then restore it afterwards.

    // Also, archiving a CALayer with an image in it leaks memory. (Filed as rdar://5786865 )

    // As a workaround, clear the contents before archiving, then restore.

    CGColorRef bg = CGColorRetain(self.backgroundColor);

    self.backgroundColor = NULL;

    id contents = [self.contents retain];

    self.contents = nil;

    NSData *data = [NSKeyedArchiver archivedDataWithRootObject: self];

    self.backgroundColor = bg;

    self.contents = contents;

    GGBLayer *clone = [NSKeyedUnarchiver unarchiveObjectWithData: data];

    clone.backgroundColor = bg;

    clone.contents = contents;

    CGColorRelease(bg);

    [contents release];

    return [clone retain];

}

#endif

@end

#pragma mark -

#pragma mark UTILITIES:

void BeginDisableAnimations(void)

{

    [CATransaction begin];

    [CATransaction setValue:(id)kCFBooleanTrue

                     forKey:kCATransactionDisableActions];

}

void EndDisableAnimations(void)

{

    [CATransaction commit];

} 

void ChangeSuperlayer( CALayer *layer, CALayer *newSuperlayer, int index )

{

    // Disable actions, else the layer will move to the wrong place and then back!

    [CATransaction flush];

    BeginDisableAnimations();

    CGPoint pos = layer.position;

    if( layer.superlayer )

        pos = [newSuperlayer convertPoint: pos fromLayer: layer.superlayer];

    [layer retain];

    [layer removeFromSuperlayer];

    layer.position = pos;

    if( index >= 0 )

        [newSuperlayer insertSublayer: layer atIndex: index];

    else

        [newSuperlayer addSublayer: layer];

    [layer release];

    EndDisableAnimations();

}

void RemoveImmediately( CALayer *layer )

{

    [CATransaction flush];

    BeginDisableAnimations();

    [layer removeFromSuperlayer];

    EndDisableAnimations();

}    

CGColorRef GetEffectiveBackground( CALayer *layer )

{

    for( ; layer; layer=layer.superlayer ) {

        CGColorRef bg = layer.backgroundColor;

        if( bg )

            return bg;

    }

    return nil;

}