private async void OnContentManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
if ((e.Cumulative.Translation.X > 0 && e.Cumulative.Translation.X >= 150) ||
(e.Cumulative.Translation.X < 0 && Math.Abs(e.Cumulative.Translation.X) >= this.rightContent.ActualWidth))
{
if (e.Cumulative.Translation.X > 0)
{
await this.FadeOutControlDirection(AnimationDirection.Right);
if (this.LeftCommand != null && this.LeftCommand.CanExecute(null))
{
this.LeftCommand.Execute(this.DataContext);
}
await this.FadeOutControl(0);
}
else if (e.Cumulative.Translation.X < 0)
{
lastActionListItemAnimated = this;
if (this.scrollviewer == null)
{
this.scrollviewer = TreeHelper.FindVisualAncestor <ScrollViewer>(this);
this.scrollviewer.ViewChanging += this.OnScrollViewerViewChanging;
}
}
}
else
{
await this.FadeOutControl(0d);
this.leftContent.Visibility = Visibility.Collapsed;
this.rightContent.Visibility = Visibility.Collapsed;
}
}
private Task FadeOutControl(double target)
{
TimeSpan duration = TimeSpan.FromMilliseconds(200);
DoubleAnimationUsingKeyFrames doubleAnimationKeyFrames = new DoubleAnimationUsingKeyFrames();
if (this.content.RenderTransform is CompositeTransform)
{
doubleAnimationKeyFrames.KeyFrames.Add(new EasingDoubleKeyFrame {
KeyTime = TimeSpan.Zero, Value = ((CompositeTransform)this.content.RenderTransform).TranslateX
});
}
doubleAnimationKeyFrames.KeyFrames.Add(new EasingDoubleKeyFrame {
KeyTime = duration, Value = target, EasingFunction = new CubicEase {
EasingMode = EasingMode.EaseIn
}
});
Storyboard.SetTarget(doubleAnimationKeyFrames, this.content);
Storyboard.SetTargetProperty(doubleAnimationKeyFrames, "(UIElement.RenderTransform).(CompositeTransform.TranslateX)");
TaskCompletionSource <bool> source = new TaskCompletionSource <bool>();
Storyboard storyBoard = new Storyboard {
Duration = duration
};
storyBoard.Children.Add(doubleAnimationKeyFrames);
storyBoard.Completed += (s, e) => source.SetResult(true);
storyBoard.Begin();
lastActionListItemAnimated = null;
return(source.Task);
}
private void OnContentManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
if (lastActionListItemAnimated != null)
{
lastActionListItemAnimated.Reset();
lastActionListItemAnimated = null;
}
e.Handled = false;
var target = e.Cumulative.Translation.X;
if (target < 0)
{
if (this.rightContent.ActualWidth > 0 && Math.Abs(target) > this.rightContent.ActualWidth)
{
target = this.rightContent.ActualWidth * -1;
}
}
this.leftContent.Visibility = target > 0 ? Visibility.Visible : Visibility.Collapsed;
this.rightContent.Visibility = target < 0 ? Visibility.Visible : Visibility.Collapsed;
if (this.content.RenderTransform is CompositeTransform)
{
((CompositeTransform)this.content.RenderTransform).TranslateX = target;
}
}
