/*

     File: ASCValueTransformers.m

 Abstract: Declares and implements value transformers needed in the user interface for bindings.

  Version: 1.0

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#import <SceneKit/SceneKit.h>

#import "ASCValueTransformers.h"

@implementation ASCLightingModelTransformer

+ (void)initialize {

    id lightingModelTransformer = [[[self class] alloc] init];

    [NSValueTransformer setValueTransformer:lightingModelTransformer

                                    forName:NSStringFromClass([self class])];

}

+ (Class)transformedValueClass {

    return [NSString class];

}

+ (BOOL)allowsReverseTransformation {

    return YES;

}

- (id)transformedValue:(id)item {

    if ([item isEqual:SCNLightingModelBlinn])

        return @0;

    if ([item isEqual:SCNLightingModelPhong])

        return @1;

    if ([item isEqual:SCNLightingModelLambert])

        return @2;

    if ([item isEqual:SCNLightingModelConstant])

        return @3;

    return nil;

}

- (id)reverseTransformedValue:(id)item {

    switch ([item unsignedIntegerValue]) {

        case 0:

            return SCNLightingModelBlinn;

        case 1:

            return SCNLightingModelPhong;

        case 2:

            return SCNLightingModelLambert;

        case 3:

            return SCNLightingModelConstant;

    }

    return nil;

}

@end

@implementation ASCImageContentsOrNilTransformer

+ (void)initialize {

    id nameTransformer = [[[self class] alloc] init];

    [NSValueTransformer setValueTransformer:nameTransformer

                                    forName:NSStringFromClass([self class])];

}

+ (Class)transformedValueClass {

    return [NSImage class];

}

+ (BOOL)allowsReverseTransformation {

    return YES;

}

- (id)transformedValue:(id)item {

    return [item isKindOfClass:[NSImage class]] ? item : nil;

}

- (id)reverseTransformedValue:(id)item {

    return [item isKindOfClass:[NSImage class]] ? item : nil;

}

@end

@implementation ASCColorContentsOrNilTransformer

+ (void)initialize {

    id nameTransformer = [[[self class] alloc] init];

    [NSValueTransformer setValueTransformer:nameTransformer

                                    forName:NSStringFromClass([self class])];

}

+ (Class)transformedValueClass {

    return [NSColor class];

}

+ (BOOL)allowsReverseTransformation {

    return YES;

}

- (id)transformedValue:(id)item {

    return [item isKindOfClass:[NSColor class]] ? item : nil;

}

- (id)reverseTransformedValue:(id)item {

    return [item isKindOfClass:[NSColor class]] ? item : nil;

}

@end