/*

     File: SelectionView.m 

 Abstract: Implements the Core Animation kiosk-type behavior. 

  Version: 1.1 

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 */

#import "SelectionView.h"

#import <Quartz/Quartz.h>

@implementation SelectionView

@synthesize selectedIndex;

@synthesize menuLayer;

@synthesize selectionLayer;

@synthesize names;

- (void)awakeFromNib

{

#pragma mark - Listing: Implementation of awakeFromNib

    // create an array that contains the various 

    // strings

    self.names=[NSArray arrayWithObjects:@"Movies",@"Music",

                @"Podcasts",@"Photos",@"Internet",

                nil] ;

    // The cursor isn't used for selection, so we hide it

    [NSCursor hide];

    // go full screen, as a kiosk application 

    [self enterFullScreenMode:[self.window screen] withOptions:NULL];

    // Make the window the first responder to get keystrokes

    [self.window makeFirstResponder:self];

    // setup the individual layers

    [self setupLayers];

    // bring the window to the front

    [self.window makeKeyAndOrderFront:self];

}

#pragma mark Listing: Configuration of the Background rootLayer

-(void)setupLayers;

{

    // Make a Quartz Composition Layer.  

    // Note: Running a QCComposition can impact performance

    QCCompositionLayer* rootLayer=[QCCompositionLayer compositionLayerWithFile:

               [[NSBundle mainBundle] pathForResource:@"Background" ofType:@"qtz"]];

    // Set the QCCompositionLayer as the root layer

    // and then turn on wantsLayer. This order prevents

    // the view from creating it's own layer.

    [self setLayer:rootLayer];

    [self setWantsLayer:YES];

#pragma mark - Setup menuLayers Array. The Selectable Menu Items.

    // Create a layer to contain the menus  

    self.menuLayer=[CALayer layer] ;

    self.menuLayer.frame=rootLayer.frame;

    self.menuLayer.layoutManager=[CAConstraintLayoutManager layoutManager];

    [rootLayer addSublayer:self.menuLayer];

    // setup and calculate the size and location of the individually selectable items.

    CGFloat width=400.0f;

    CGFloat height=50.0f;

    CGFloat spacing=20.0f;

    CGFloat fontSize=32.0f;

    CGFloat initialOffset=(self.bounds.size.height/2-(height*5+spacing*4)/2.0f)+50;

    //Create whiteColor it's used to draw the text and also in the selectionLayer

    CGColorRef myWhiteColor=CGColorCreateGenericRGB(1.0f,1.0f,1.0f,1.0f);

    // Iterate over the list of selection names and create layers for them.

    // The menuItemLayer's are also positioned during this loop.

    NSUInteger i;

    for (i=0;i<[names count];i++) {

        CATextLayer *menuItemLayer=[CATextLayer layer];

        menuItemLayer.string=[self.names objectAtIndex:i];

        menuItemLayer.font=@"Lucida-Grande";

        menuItemLayer.fontSize=fontSize;

        menuItemLayer.foregroundColor=myWhiteColor;

        [menuItemLayer addConstraint:[CAConstraint

                                      constraintWithAttribute:kCAConstraintMaxY

                                      relativeTo:@"superlayer"

                                      attribute:kCAConstraintMaxY

                                      offset:-(i*height+spacing+initialOffset)]];

        [menuItemLayer addConstraint:[CAConstraint

                                      constraintWithAttribute:kCAConstraintMidX

                                      relativeTo:@"superlayer"

                                      attribute:kCAConstraintMidX]];

        [self.menuLayer addSublayer:menuItemLayer];

    } // end of for loop

    [self.menuLayer layoutIfNeeded];

#pragma mark - Setup selectionLayer. Displays the Currently Selected Item.

    // Use an additional layer, selectionLayer

    // to indicate that the current item is selected

    self.selectionLayer=[CALayer layer];

    self.selectionLayer.bounds=CGRectMake(0.0f,0.0f,width,height);

    self.selectionLayer.borderWidth=2.0f;

    self.selectionLayer.cornerRadius=25;

    self.selectionLayer.borderColor=myWhiteColor;

    CIFilter *filter = [CIFilter filterWithName:@"CIBloom"];

    [filter setDefaults];

    [filter setValue:[NSNumber numberWithFloat:5.0f] forKey:@"inputRadius"];

    [filter setName:@"pulseFilter"];

    [selectionLayer setFilters:[NSArray arrayWithObject:filter]];

    // The selectionLayer shows a subtle pulse as it

    // is displayed. This section of the code create the pulse animation

    // setting the filters.pulsefilter.inputintensity to range from 0 to 2.

    // This will happen every second, autoreverse, and repeat forever

    CABasicAnimation* pulseAnimation = [CABasicAnimation animation];

    pulseAnimation.keyPath = @"filters.pulseFilter.inputIntensity";

    pulseAnimation.fromValue = [NSNumber numberWithFloat: 0.0f];

    pulseAnimation.toValue = [NSNumber numberWithFloat: 2.0f];

    pulseAnimation.duration = 1.0;

    pulseAnimation.repeatCount = HUGE_VALF;

    pulseAnimation.autoreverses = YES;

    pulseAnimation.timingFunction = [CAMediaTimingFunction functionWithName:

                                     kCAMediaTimingFunctionEaseInEaseOut];

    [selectionLayer addAnimation:pulseAnimation forKey:@"pulseAnimation"];

    // Set the first item as selected

    [self changeSelectedIndex:0];

    // finally, the selection layer is added to the root layer

    [rootLayer addSublayer:self.selectionLayer];

    // Cleanup

    CGColorRelease(myWhiteColor);

    // End of setupLayers

}

#pragma mark Listing: Handle Changes in the Selection

-(void)changeSelectedIndex:(NSInteger)theSelectedIndex

{

    self.selectedIndex=theSelectedIndex;

    if (self.selectedIndex == (NSInteger)[names count]) 

        self.selectedIndex=[names count]-1;

    if (self.selectedIndex < 0) 

        self.selectedIndex=0;

    CALayer *theSelectedLayer=[[self.menuLayer sublayers] objectAtIndex:self.selectedIndex];

    // Moves the selectionLayer to illustrate the 

    // currently selected item. It does this

    // using an animation so that the transition 

    // is visible.

    self.selectionLayer.position=theSelectedLayer.position;

};

#pragma mark Listing: Handling Up and Down Key Presses

-(void)moveUp:(id)sender

{

    [self changeSelectedIndex:self.selectedIndex-1];

}

-(void)moveDown:(id)sender

{

    [self changeSelectedIndex:self.selectedIndex+1];

}

#pragma mark Listing: Dealloc and Cleanup

-(void)dealloc

{

    [self setLayer:nil];

    self.menuLayer=nil;

    self.selectionLayer=nil;

    self.names=nil;

    [super dealloc];

}

@end