@implementation AnimatableSplitView

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code here.
    }

    return self;
}

- (CGFloat)positionForDividerAtIndex:(NSInteger)idx
{
    NSRect frame = [[[self subviews] objectAtIndex:idx] frame];
    if (self.isVertical) {
        return NSMaxX(frame) + ([self dividerThickness] * idx);
    }
    else {
        return NSMaxY(frame) + ([self dividerThickness] * idx);
    }
}

- (void)setPosition:(CGFloat)position ofDividerAtIndex:(NSInteger)dividerIndex animate:(BOOL)animate
{
    if (!animate) {
        [super setPosition:position ofDividerAtIndex:dividerIndex];
    }
    else {
        [[self animator] setValue:[NSNumber numberWithFloat:position] forKey:[NSString stringWithFormat:@"dividerPosition%li", dividerIndex, nil]];
    }
}

- (BOOL) _tryParsingDividerPositionIndex:(NSInteger*) anInteger fromKey:(NSString*) key
{
    *anInteger = 0;
    return YES;
}

- (id)animationForKey:(NSString *)key
{
    id animation = [super animationForKey:key];
    NSInteger idx;
    if (animation == nil && [self _tryParsingDividerPositionIndex:&idx fromKey:key]) {
        animation = [super animationForKey:@"dividerPosition"];
    }

    return animation;
}

- (id)valueForUndefinedKey:(NSString *)key
{
    NSInteger idx;
    if ([self _tryParsingDividerPositionIndex:&idx fromKey:key]) {
        CGFloat position = [self positionForDividerAtIndex:idx];
        return [NSNumber numberWithFloat:position];
    }

    return nil;
}

- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
    NSInteger idx;
    if ([value isKindOfClass:[NSNumber class]] && [self _tryParsingDividerPositionIndex:&idx fromKey:key]) {
        [super setPosition:[value floatValue] ofDividerAtIndex:idx];
    }
}

@end