cog/Utils/TrackingSlider.m

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