/*

File: Card.m

Abstract: A card of some type (playing card, Community Chest, money, ...).

Version: 1.0

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may be used to endorse or promote products derived from the Apple

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as expressly stated in this notice, no other rights or licenses, express

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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

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*/

#import "Card.h"

#import "QuartzUtils.h"

/**  WARNING: THIS CODE REQUIRES GARBAGE COLLECTION!

 **  This sample application uses Objective-C 2.0 garbage collection.

 **  Therefore, the source code in this file does NOT perform manual object memory management.

 **  If you reuse any of this code in a process that isn't garbage collected, you will need to

 **  add all necessary retain/release/autorelease calls, and implement -dealloc methods,

 **  otherwise unpleasant leakage will occur!

 **/

@implementation Card

static CATransform3D kFaceUpTransform, kFaceDownTransform;

+ (void) initialize

{

    if( self==[Card class] ) {

        kFaceUpTransform = kFaceDownTransform = CATransform3DIdentity;

        // Construct a 180-degree rotation matrix:

        kFaceDownTransform.m11 = kFaceDownTransform.m33 = -1;

        // The more obvious way to create kFaceDownTransform would be to call

        // CATransform3DMakeRotation(pi,0,1,0), but due to round-off errors, that transform

        // will have non-zero values in some other places, making it appear to CA as a true

        // 3D transform; this will then cause unexpected clipping behaviors when used.

    }

}

+ (NSRange) serialNumberRange;

{

    NSAssert1(NO,@"%@ forgot to override +serialNumberRange",self);

    return NSMakeRange(0,0);

}

- (id) initWithSerialNumber: (int)serial position: (CGPoint)pos

{

    self = [super init];

    if (self != nil) {

        _serialNumber = serial;

        self.bounds = CGRectMake(0,0,kCardWidth,kCardHeight);

        self.position = pos;

        self.edgeAntialiasingMask = 0;

        _back = [self createBack];

        [self addSublayer: _back];

        _front = [self createFront];

        _front.transform = kFaceDownTransform;

        [self addSublayer: _front];

    }

    return self;

}

- (void)encodeWithCoder:(NSCoder *)aCoder

{

    [super encodeWithCoder: aCoder];

    [aCoder encodeInt: _serialNumber forKey: @"serialNumber"];

}

- (id)initWithCoder:(NSCoder *)aDecoder

{

    self = [super initWithCoder: aDecoder];

    if( self ) {

        _serialNumber = [aDecoder decodeIntForKey: @"serialNumber"];

    }

    return self;

}

- (NSString*) description

{

    return [NSString stringWithFormat: @"%@[#%i]",self.class,_serialNumber];

}

@synthesize serialNumber=_serialNumber;

- (BOOL) faceUp

{

    return _faceUp;

}

- (void) setFaceUp: (BOOL)up

{

    if( up != _faceUp ) {

        // The Card has separate sub-layers for its front and back. At any time, one of them

        // is hidden, by having a 180 degree rotation about the Y axis.

        // To flip the card, both front and back layers are flipped over.

        CATransform3D xform;

        xform = up ?kFaceUpTransform :kFaceDownTransform;

        _front.transform = xform;

        xform = up ?kFaceDownTransform :kFaceUpTransform;

        _back.transform = xform;

        _faceUp = up;

    }

}

- (CALayer*) createFront

{

    CALayer *front = [[CALayer alloc] init];

    front.bounds = CGRectMake(0,0,kCardWidth,kCardHeight);

    front.position = CGPointMake(kCardWidth/2,kCardHeight/2);

    front.edgeAntialiasingMask = 0;

    front.backgroundColor = kWhiteColor;

    front.cornerRadius = 8;

    front.borderWidth = 1;

    front.borderColor = CGColorCreateGenericGray(0.7, 1.0);

    front.doubleSided = NO;         // this makes the layer invisible when it's flipped

    return front;

}

- (CALayer*) createBack

{

    CGSize size = self.bounds.size;

    CALayer *back = [[CALayer alloc] init];

    back.bounds = CGRectMake(0,0,size.width,size.height);

    back.position = CGPointMake(kCardWidth/2,kCardHeight/2);

    back.contents = (id) GetCGImageNamed(@"/Library/Desktop Pictures/Classic Aqua Blue.jpg");

    back.contentsGravity = kCAGravityResize;

    back.masksToBounds = YES;

    back.borderWidth = 4;

    back.borderColor = kWhiteColor;

    back.cornerRadius = 8;

    back.edgeAntialiasingMask = 0;

    back.doubleSided = NO;          // this makes the layer invisible when it's flipped

    CATextLayer *label = AddTextLayer(back, @"\u2603",          // Unicode snowman character

                                      [NSFont systemFontOfSize: 0.9*size.width],

                                      kCALayerWidthSizable|kCALayerHeightSizable);

    label.foregroundColor = CGColorCreateGenericGray(1.0,0.5);

    return back;

}    

#pragma mark -

#pragma mark DRAG-AND-DROP:

// An image from another app can be dragged onto a Card to change its background. */

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender

{

    NSPasteboard *pb = [sender draggingPasteboard];

    if( [NSImage canInitWithPasteboard: pb] )

        return NSDragOperationCopy;

    else

        return NSDragOperationNone;

}

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender

{

    CGImageRef image = GetCGImageFromPasteboard([sender draggingPasteboard]);

    if( image ) {

        CALayer *face = _faceUp ?_front :_back;

        face.contents = (id) image;

        face.contentsGravity = kCAGravityResizeAspectFill;

        face.masksToBounds = YES;

        return YES;

    } else

        return NO;

}

@end