private void HandleCompleted(bool stopped = false)
{
var completed = _storyboardCompleted && _compositionCompleted;
if (!completed && !stopped)
{
return;
}
if (_storyboardCompleted && _compositionCompleted)
{
State = AnimationSetState.Completed;
}
else
{
State = AnimationSetState.Stopped;
}
if (_animationTCS != null && !_animationTCS.Task.IsCompleted)
{
Completed?.Invoke(this, new AnimationSetCompletedEventArgs()
{
Completed = _storyboardCompleted && _compositionCompleted
});
_animationTCS.SetResult(State == AnimationSetState.Completed);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="AnimationSet"/> class.
/// </summary>
/// <param name="element">The associated element</param>
public AnimationSet(UIElement element)
{
if (element == null)
{
throw new NullReferenceException("Element must not be null");
}
var visual = ElementCompositionPreview.GetElementVisual(element);
if (visual == null)
{
throw new NullReferenceException("Visual must not be null");
}
Visual = visual;
if (Visual.Compositor == null)
{
throw new NullReferenceException("Visual must have a compositor");
}
Element = element;
State = AnimationSetState.NotStarted;
_compositor = Visual.Compositor;
_compositionAnimations = new Dictionary <string, CompositionAnimation>();
_compositionEffectAnimations = new List <EffectAnimationDefinition>();
_directCompositionPropertyChanges = new Dictionary <string, object>();
_directCompositionEffectPropertyChanges = new List <EffectDirectPropertyChangeDefinition>();
_animationSets = new List <AnimationSet>();
_storyboard = new Storyboard();
_storyboardAnimations = new Dictionary <string, Timeline>();
_animationTasks = new List <AnimationTask>();
}
/// <summary>
/// Starts all animations and returns an awaitable task.
/// </summary>
/// <returns>A <see cref="Task"/> that can be awaited until all animations have completed</returns>
public async Task <bool> StartAsync()
{
if (_animationTCS == null || _animationTCS.Task.IsCompleted)
{
if (_animationTCS != null && _animationTCS.Task.IsCompleted)
{
foreach (var set in _animationSets)
{
set.State = AnimationSetState.NotStarted;
set._animationTCS = null;
}
}
State = AnimationSetState.Running;
_animationTCS = new TaskCompletionSource <bool>();
}
else
{
return(await _animationTCS.Task);
}
foreach (var set in _animationSets)
{
if (set.State != AnimationSetState.Completed)
{
var completed = await set.StartAsync();
if (!completed)
{
// the animation was stopped
return(await _animationTCS.Task);
}
}
}
foreach (var task in _animationTasks)
{
if (task.Task != null && !task.Task.IsCompleted)
{
await task.Task;
}
// if _animationSet is stopped while task was running
if (State == AnimationSetState.Stopped)
{
return(await _animationTCS.Task);
}
}
_animationTasks.Clear();
foreach (var property in _directCompositionPropertyChanges)
{
typeof(Visual).GetProperty(property.Key).SetValue(Visual, property.Value);
}
foreach (var definition in _directCompositionEffectPropertyChanges)
{
definition.EffectBrush.Properties.InsertScalar(definition.PropertyName, definition.Value);
}
if (_compositionAnimations.Count > 0 || _compositionEffectAnimations.Count > 0)
{
if (_batch != null)
{
if (!_batch.IsEnded)
{
_batch.End();
}
_batch.Completed -= Batch_Completed;
}
_batch = _compositor.CreateScopedBatch(CompositionBatchTypes.Animation);
_batch.Completed += Batch_Completed;
foreach (var anim in _compositionAnimations)
{
Visual.StartAnimation(anim.Key, anim.Value);
}
foreach (var effect in _compositionEffectAnimations)
{
effect.EffectBrush.StartAnimation(effect.PropertyName, effect.Animation);
}
_compositionCompleted = false;
_batch.End();
}
else
{
_compositionCompleted = true;
}
if (_storyboardAnimations.Count > 0)
{
_storyboardCompleted = false;
_storyboard.Completed -= Storyboard_Completed;
_storyboard.Completed += Storyboard_Completed;
_storyboard.Begin();
}
else
{
_storyboardCompleted = true;
}
HandleCompleted();
return(await _animationTCS.Task);
}