public Task Run(Panel scene, HostControl backView, HostControl frontView, AnimationType animationType)
{
var tcs = new TaskCompletionSource <bool>();
if (IsRunning)
{
tcs.SetCanceled();
return(tcs.Task);
}
IsRunning = true;
//
// Creates a namescope that will be associated to the scene panel
// to work around the Wpf bug when using Storyboard.SetTarget, use a namescope + Storyboard.SetTargetName instead
// cf. http://connect.microsoft.com/VisualStudio/feedback/details/723701/storyboard-settarget-only-works-on-uielements-but-throws-no-exception
//
var sceneNameScope = NameScope.GetNameScope(scene);
if (sceneNameScope == null)
{
sceneNameScope = new NameScope();
NameScope.SetNameScope(scene, sceneNameScope);
}
var transitionInfo = new TransitionInfo
{
Scene = scene,
SceneNameScope = sceneNameScope,
BackView = backView,
FrontView = frontView,
AnimationType = animationType
};
// Storyboard completed handler
var localTransitionInfo = transitionInfo;
var storyboardCompletedAction = new Action(() =>
{
// Clean
OnRunTransitionCompleted(localTransitionInfo);
IsRunning = false;
tcs.SetResult(true);
});
// Execute this code asynchronously in the dispatcher with the priority specified
// so that we can be sure, it will be executed after the view was rendered
Dispatcher.CurrentDispatcher.BeginInvoke(new Action(() =>
{
OnRunTransitionStarted(transitionInfo);
var storyboard = CreateAnimation(transitionInfo);
// if the storyboard is empty then trigger storyboard completion manually
if (storyboard.Children.Count == 0)
{
storyboardCompletedAction();
}
else
{
// If it is a 3D animation then hide views
if (this is Transition3D)
{
EnsuresViewsAreHidden(backView, frontView);
}
else
{
EnsuresViewsAreVisible(backView, frontView);
}
storyboard.Completed += (sender, args) => storyboardCompletedAction();
storyboard.Begin(scene);
}
}), DispatcherPriority.Loaded);
return(tcs.Task);
}
protected virtual void OnRunTransitionCompleted(TransitionInfo transitionInfo)
{
}
protected abstract Storyboard CreateAnimation(TransitionInfo transitionInfo);
protected virtual void OnRunTransitionStarted(TransitionInfo transitionInfo)
{
}
