Layer Filters - Core Animation - page 105

LISTING 6-13

Continued

// Cause the layer to use its default transition
return nil ;

}

@end

The new RippleLayer class is used in the application's delegate class. The complete
AppDelegate code is in Listing 6-14.

LISTING 6-14

AppDelegate Implementation Using Encapsulation

#import “RippleLayer.h”

@interface AppDelegate : NSObject {
IBOutlet NSWindow *window;
RippleLayer *transitionLayer;

BOOL toggle;

}

-( IBAction )doTransition:( id )sender;
@end

@implementation AppDelegate
-( void )awakeFromNib;
{

[[window contentView ] setWantsLayer: YES ];

CGColorRef green =
CGColorCreateGenericRGB (0, 0.45, 0, 1);

transitionLayer = [[[RippleLayer alloc ] init ] retain ];
[transitionLayer setFrame :
NSRectToCGRect([[window contentView ] frame ])];

[transitionLayer setBackgroundColor :green];
[transitionLayer setDelegate : self ];
[transitionLayer setBorderWidth :3];

// Keep the layer behind the button
[[[window contentView ] layer ]
insertSublayer :transitionLayer atIndex :0];