/// <summary>
/// Perform the animation when the child's height has changed.
/// </summary>
/// <param name="h"></param>
/// <returns></returns>
private double AnimatedResize(Double h)
{
double delta = targetHeight - h;
Animation.Animation animation = HeightAnimation as Animation.Animation;
if (animation == null)
{
animation = CreateAnimation();
}
targetHeight = h;
//animation.From = delta;
//animation.To = 0;
//this.BeginAnimation(AnimationDecorator.HeightOffsetProperty, animation);
animation.FillMode = FillMode.Backward;
KeyFrame keyFrame = new KeyFrame();
keyFrame.Cue = new Cue(0);
keyFrame.Setters.Add(new Setter(AnimationDecorator.HeightOffsetProperty, delta));
animation.Children.Add(keyFrame);
keyFrame = new KeyFrame();
keyFrame.Cue = new Cue(1);
keyFrame.Setters.Add(new Setter(AnimationDecorator.HeightOffsetProperty, 0));
animation.Children.Add(keyFrame);
animation.RunAsync(this);
return(delta);
}
private async void AnimateExpandedChanged(bool expanded)
{
if (Child != null)
{
animating = true;
if (YOffset > 0)
{
YOffset = 0;
}
if (-YOffset > Child.DesiredSize.Height)
{
YOffset = -Child.DesiredSize.Height;
}
Animation.Animation animation = HeightAnimation as Animation.Animation;
if (animation == null)
{
animation = CreateAnimation();
}
animation.FillMode = expanded ? FillMode.Forward : FillMode.Backward;
double val = expanded ? 0 : -Child.DesiredSize.Height;
KeyFrame keyFrame = null;
if (expanded)
{
keyFrame = new KeyFrame();
keyFrame.Cue = new Cue(0);
keyFrame.Setters.Add(new Setter(AnimationDecorator.YOffsetProperty, YOffset));
animation.Children.Add(keyFrame);
keyFrame = new KeyFrame();
keyFrame.Cue = new Cue(1);
keyFrame.Setters.Add(new Setter(AnimationDecorator.YOffsetProperty, val));
animation.Children.Add(keyFrame);
}
else
{
keyFrame = new KeyFrame();
keyFrame.Cue = new Cue(1);
keyFrame.Setters.Add(new Setter(AnimationDecorator.YOffsetProperty, val));
animation.Children.Add(keyFrame);
keyFrame = new KeyFrame();
keyFrame.Cue = new Cue(0);
keyFrame.Setters.Add(new Setter(AnimationDecorator.YOffsetProperty, 1d));
animation.Children.Add(keyFrame);
}
//animation.From = null;
//animation.To =
//animation.Completed += new EventHandler(animation_Completed);
//this.BeginAnimation(AnimationDecorator.YOffsetProperty, animation);
if (OpacityAnimation)
{
val = expanded ? 1 : 0;
keyFrame.Setters.Add(new Setter(AnimationDecorator.AnimationOpacityProperty, val));
animation.Children.Add(keyFrame);
//this.BeginAnimation(AnimationDecorator.AnimationOpacityProperty, animation);
}
await Task.WhenAll(new Task[] { animation.RunAsync(this) }).ContinueWith(x =>
{
animating = false;
});
}
else
{
YOffset = int.MinValue;
}
}