91 lines
2.1 KiB
Objective-C
91 lines
2.1 KiB
Objective-C
#import "TrackingSlider.h"
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#import "TrackingCell.h"
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@implementation TrackingSlider
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static NSString *TrackingSliderValueObservationContext = @"TrackingSliderValueObservationContext";
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- (id)initWithFrame:(NSRect)frameRect
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{
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self = [super initWithFrame:frameRect];
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if (self)
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{
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bindingInfo = [[NSMutableDictionary alloc] init];
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}
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return self;
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}
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- (id)initWithCoder:(NSCoder *)decoder
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{
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self = [super initWithCoder:decoder];
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if (self)
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{
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bindingInfo = [[NSMutableDictionary alloc] init];
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}
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return self;
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
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{
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if ([TrackingSliderValueObservationContext isEqual:context])
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{
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if (![self isTracking])
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{
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id value = [change objectForKey:NSKeyValueChangeNewKey];
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[self setDoubleValue:[value doubleValue]];
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}
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}
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else
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{
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[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
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}
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}
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- (void)bind:(NSString *)binding toObject:(id)observableController withKeyPath:(NSString *)keyPath options:(NSDictionary *)options
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{
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if ([binding isEqualToString:@"value"])
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{
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[observableController addObserver:self forKeyPath:keyPath options:(NSKeyValueObservingOptionNew) context:TrackingSliderValueObservationContext];
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NSDictionary *bindingsData = [NSDictionary dictionaryWithObjectsAndKeys:
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observableController, NSObservedObjectKey,
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[[keyPath copy] autorelease], NSObservedKeyPathKey,
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[[options copy] autorelease], NSOptionsKey, nil];
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[bindingInfo setObject:bindingsData forKey:binding];
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}
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else
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{
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[super bind:binding toObject:observableController withKeyPath:keyPath options:options];
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}
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}
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- (void)unbind:(NSString *)binding
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{
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if ([binding isEqualToString:@"value"])
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{
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NSDictionary *info = [bindingInfo objectForKey:binding];
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NSString *keyPath = [info objectForKey:NSObservedKeyPathKey];
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id observedObject = [info objectForKey:NSObservedObjectKey];
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[observedObject removeObserver:self forKeyPath:keyPath];
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}
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else
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{
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[super unbind:binding];
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}
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}
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- (BOOL)isTracking
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{
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return [[self cell] isTracking];
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}
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@end
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