/*

     File: BulbLayer.m

 Abstract: The custom CALayer subclass which implements a custom implicitly animatable property.

  Version: 1.0

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 */

#import "BulbLayer.h"

#import "Defines.h"

@implementation BulbLayer

// Needed to support implicit animation of this property.

@dynamic brightness;

// For CALayer subclasses, always support initWithLayer: by copying over custom properties.

-(id)initWithLayer:(id)layer {

    if( ( self = [super initWithLayer:layer] ) ) {

        if ([layer isKindOfClass:[BulbLayer class]]) {

            self.brightness = ((BulbLayer*)layer).brightness;

        }

    }

    return self;

}

// Instruct to Core Animation that a change in the custom "brightness" property should automatically trigger a redraw of the layer.

+(BOOL)needsDisplayForKey:(NSString*)key {

    if( [key isEqualToString:@"brightness"] )

        return YES;

    return [super needsDisplayForKey:key];

}

// Needed to support implicit animation of this property.

// Return the basic animation the implicit animation will leverage.

-(id<CAAction>)actionForKey:(NSString *)event {

    NSLog(@"%s - event: %@",__PRETTY_FUNCTION__,event);

    if( [event isEqualToString:@"brightness"] ) {

#if ANIMATION_TYPE_KEYFRAME

        // Create a basic interpolation for "briteness" animation

        CAKeyframeAnimation *theAnimation = [CAKeyframeAnimation

                                          animationWithKeyPath:event];

        // Hint: the previous value of the property is stored in the presentationLayer

        // Since for implicit animations, the model property is already set to the new value.

        theAnimation.calculationMode = kCAAnimationDiscrete;

        theAnimation.values = @[

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                @(0.0), @(255.0),

                                ];

#else

        // Create a basic interpolation for "briteness" animation

        CABasicAnimation *theAnimation = [CABasicAnimation

                                          animationWithKeyPath:event];

        // Hint: the previous value of the property is stored in the presentationLayer

        // Since for implicit animations, the model property is already set to the new value.

        theAnimation.fromValue = [[self presentationLayer] valueForKey:event];

#endif

        return theAnimation;

    }

    return [super actionForKey:event];

}

@end