AnimatedSlider/NSSliderExtensions.m
/* |
File: NSSliderExtensions.m |
Abstract: A category for NSSlider that adds support for |
implicitly animating the slider's value. |
Version: 1.1 |
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*/ |
#import "NSSliderExtensions.h" |
#import <Quartz/Quartz.h> |
@implementation NSSlider (Extension) |
/* This method is part of the NSAnimatablePropertyContainer which is adopted by NSView (and hence all its |
* subclasses. It is used to retrieve the default animation that should be performed to animate a given |
* property. If no default animation is provided, the property is not considered implicitly animatable. |
* |
* By default NSSlider does not provide an implicit animation for its "floatValue" property. So, we will |
* provide one with this category thus making the "floatValue" animatable. |
*/ |
+ (id)defaultAnimationForKey:(NSString *)key |
{ |
if ([key isEqualToString:@"floatValue"]) { |
// By default, use simple linear interpolation. |
return [CABasicAnimation animation]; |
} |
/* You may wish to add handlers here for the other many properties that can affect a slider's value |
* such as intValue, doubleValue, ... */ |
else { |
// Defer to super's implementation for any keys we don't specifically handle. |
return [super defaultAnimationForKey:key]; |
} |
} |
@end |
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