private async void AnimatedSwitch_Click(object sender, RoutedEventArgs e)
{
// The sample demonstrates a general strategy for doing custom animations when switching view
// It's technically only possible to animate the contents of a particular view. But, it is possible
// to animate the outgoing view to some common visual (like a blank background), have the incoming
// view draw that same visual, switch in the incoming window (which will be imperceptible to the
// user since both windows will be showing the same thing), then animate the contents of the incoming
// view in from the common visual.
var selectedItem = ViewChooser.SelectedItem as ViewLifetimeControl;
if (selectedItem != null)
{
try
{
// Prevent the view from being closed while switching to it
selectedItem.StartViewInUse();
// Signal that the window is about to be switched to
// If the view is already shown to the user, then the app
// shouldn't run any extra animations
var currentId = ApplicationView.GetForCurrentView().Id;
bool isViewVisible = await ApplicationViewSwitcher.PrepareForCustomAnimatedSwitchAsync(
selectedItem.Id,
currentId,
ApplicationViewSwitchingOptions.SkipAnimation);
// The view may already be on screen, in which case there's no need to animate its
// contents (or animate out the contents of the current window)
if (!isViewVisible)
{
// The view isn't visible, so animate it on screen
lastFadeOutTime = DateTime.Now;
// Make the current view totally blank. The incoming view is also
// going to be totally blank when the two windows switch
await FadeOutContents();
// Once the current view is blank, switch in the other window
await selectedItem.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
var currentPage = (SecondaryViewPage)((Frame)Window.Current.Content).Content;
// More details are in SecondaryViewPage.xaml.cs
// This function makes the view totally blank, swaps the two view (which
// is not apparent to the user since both windows are blank), then animates
// in the content of newly visible view
currentPage.SwitchAndAnimate(currentId);
});
}
selectedItem.StopViewInUse();
}
catch (InvalidOperationException)
{
// The view could be in the process of closing, and
// this thread just hasn't updated. As part of being closed,
// this thread will be informed to clean up its list of
// views (see SecondaryViewPage.xaml.cs)
}
catch (TaskCanceledException)
{
rootPage.NotifyUser("The animation was canceled. It may have timed out", NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUser("Select a window to see a switch animation. You can create a window in scenario 1", NotifyType.ErrorMessage);
}
}
