private void AssociatedObject_Unloaded(object sender, RoutedEventArgs e)
{
AssociatedObject.Unloaded -= AssociatedObject_Unloaded;
// to avoid reusing old cached elements which are being destroyed
GalleryCacheProvider.ClearCache();
Detach();
}
private void AssociatedObject_Loaded(object sender, RoutedEventArgs e)
{
if (!_loaded)
{
var parent = GalleryCacheProvider.GetGalleryItemsControl(AssociatedObject);
var scrollViewer = GalleryCacheProvider.GetGalleryScrollViewer(AssociatedObject);
Point relativePoint = AssociatedObject.TransformToAncestor(parent)
.Transform(new Point(0, 0));
_container = parent.ItemContainerGenerator.ContainerFromItem(AssociatedObject.DataContext);
var index = parent.ItemContainerGenerator.IndexFromContainer(_container);
//no need to animate non visible items
if (relativePoint.X < parent.ActualWidth && scrollViewer.HorizontalOffset == 0)
{
AssociatedObject.Padding = new Thickness(0, 50, 0, 0);
DoubleAnimation opacity = new DoubleAnimation(0.9, new Duration(TimeSpan.FromMilliseconds(400)));
opacity.BeginTime = new TimeSpan(0, 0, 0, 0, 100 * index + InitialDelayInMs);
opacity.EasingFunction = new QuarticEase();
AssociatedObject.BeginAnimation(Border.OpacityProperty, opacity);
ThicknessAnimation moveUp = new ThicknessAnimation(new Thickness(0), new Duration(TimeSpan.FromMilliseconds(400)));
moveUp.BeginTime = new TimeSpan(0, 0, 0, 0, 100 * index + InitialDelayInMs);
moveUp.EasingFunction = new ExponentialEase()
{
EasingMode = EasingMode.EaseOut
};
AssociatedObject.BeginAnimation(Border.PaddingProperty, moveUp);
}
else
{
AssociatedObject.Opacity = 0.9;
AssociatedObject.Margin = new Thickness(0);
}
_loaded = true;
}
}