/*

     File: FilterAttributeBinding.h

 Abstract: Binding between a CIFilter's attribute and a SliderCell instance.

  Version: 1.0

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#import <Foundation/Foundation.h>

#import <QuartzCore/QuartzCore.h>

#import "SliderCell.h"

@interface FilterAttributeBinding : NSObject <SliderCellDelegate>

{

@private

    CIFilter *_filter;

    CGSize _screenSize;

    NSString *_attrName;

    NSString *_attrType;

    Class _attrClass;

    id _attrDefault;

    NSMutableDictionary *_sliderCellBindings;

}

- (id)initWithFilter:(CIFilter *)aFilter attributeName:(NSString *)name dictionary:(NSDictionary *)dictionary screenSize:(CGSize)screenSize;

- (NSString *)elementTitleForIndex:(NSUInteger)index;

- (double)elementValueForIndex:(NSUInteger)index;

// when a SliderCell is bound to a filter attribute, any value change in the slider will cause change in the bound filter and attribute

- (void)bindSliderCell:(SliderCell *)cell toElementIndex:(NSUInteger)index;

- (void)unbindSliderCell:(SliderCell *)cell;

// reverts the attribute's value to the default, and also causes the corresponding change in the bound SliderCell

- (void)revertToDefaultValues;

@property (readonly, nonatomic) NSUInteger elementCount;

@property (readonly, nonatomic) NSString *title;

@property (readonly, nonatomic) double minElementValue;

@property (readonly, nonatomic) double maxElementValue;

@end

// a notification is posted whenever an attribute is updated

extern NSString *const FilterAttributeValueDidUpdateNotification;

extern NSString *const FilterAttributeBindingFilterNameKey;

extern NSString *const FilterAttributeBindingAttributeNameKey;

extern NSString *const FilterAttributeBindingAttributeValueStringKey;   // value as a string

extern NSString *const kFilterObject, *const kFilterInputValue, *const kFilterInputKey;