private static void OnShowStoryboardChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue == e.OldValue)
{
return;
}
var element = d as FrameworkElement;
if (element == null)
{
throw new ArgumentException("d");
}
var entry = s_entries.GetOrCreate(element, () => new EntryInfo());
if (entry.ShowStoryboard != null)
{
ShowHideAnimation.UnhandleShowStoryboardCompletedEvent(element);
}
if (e.NewValue == null)
{
entry.ShowStoryboard = null;
}
else
{
entry.ShowStoryboard = (Storyboard)((Freezable)e.NewValue).Clone();
}
}
static void ShowStoryboard_Completed(FrameworkElement element, object sender, EventArgs e)
{
EntryInfo entry;
if (s_entries.TryGetValue(element, out entry))
{
ShowHideAnimation.UnhandleShowStoryboardCompletedEvent(element);
if (entry.ContentHolder != null)
{
entry.ContentHolder.Visibility = Visibility.Visible;
}
if (entry.SnapshotHolder != null)
{
entry.SnapshotHolder.Visibility = Visibility.Hidden;
}
}
}
private static void OnVisibilityChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue == e.OldValue)
{
return;
}
var element = d as FrameworkElement;
if (element == null)
{
throw new ArgumentException("d");
}
var entry = s_entries.GetOrCreate(element, () => new EntryInfo());
var visibility = (Visibility)e.NewValue;
if (visibility == Visibility.Visible)
{
if (entry.ShowStoryboard == null)
{
element.Visibility = Visibility.Visible;
}
else
{
if (entry.SnapshotHolder != null)
{
ShowHideAnimation.TakeSnapshot(element);
}
entry.ShowStoryboardCompletedEventHander = (_, __) => ShowHideAnimation.ShowStoryboard_Completed(element, _, __);
entry.ShowStoryboard.Completed += entry.ShowStoryboardCompletedEventHander;
element.Visibility = Visibility.Visible;
if (element.IsLoaded)
{
entry.ShowStoryboard.Begin(element);
}
else
{
entry.ShowStoryboard.Begin(element, true);
entry.ShowStoryboard.SkipToFill(element);
}
}
}
else if (visibility != Visibility.Visible)
{
if (entry.HideStoryboard == null)
{
element.Visibility = visibility;
}
else
{
if (entry.SnapshotHolder != null)
{
ShowHideAnimation.TakeSnapshot(element);
}
entry.HideStoryboardCompletedEventHander = (_, __) => ShowHideAnimation.HideStoryboard_Completed(element, _, __);
entry.HideStoryboard.Completed += entry.HideStoryboardCompletedEventHander;
element.Visibility = Visibility.Visible;
if (element.IsLoaded)
{
entry.HideStoryboard.Begin(element);
}
else
{
entry.HideStoryboard.Begin(element, true);
entry.HideStoryboard.SkipToFill(element);
}
}
}
}
