/// <summary>
/// Handles the completion of the exit transition, automatically
/// continuing to bring in the new element's transition as well if it is
/// ready.
/// </summary>
/// <param name="sender">The source object.</param>
/// <param name="e">The event arguments.</param>
private void OnExitTransitionCompleted(object sender, System.EventArgs e)
{
_readyToTransitionToNewContent = true;
_performingExitTransition = false;
if (_navigationStopped)
{
// Restore the old content presenter's interactivity if the navigation is cancelled.
CompleteTransition(_storedNavigationOutTransition, _oldContentPresenter, _storedOldTransition);
_navigationStopped = false;
}
else
{
CompleteTransition(_storedNavigationOutTransition, /*_oldContentPresenter*/ null, _storedOldTransition);
}
_storedNavigationOutTransition = null;
_storedOldTransition = null;
if (_contentReady)
{
ITransition newTransition = _storedNewTransition;
TelegramNavigationInTransition navigationInTransition = _storedNavigationInTransition;
_storedNewTransition = null;
_storedNavigationInTransition = null;
TransitionNewContent(newTransition, navigationInTransition);
}
}
/// <summary>
/// Stops the last navigation transition if it's active and a new navigation occurs.
/// </summary>
private void EnsureLastTransitionIsComplete()
{
_readyToTransitionToNewContent = false;
_contentReady = false;
if (_performingExitTransition)
{
Debug.Assert(_storedOldTransition != null && _storedNavigationOutTransition != null);
// If the app calls GoBack on NavigatedTo, we want the old content to be null
// because you can't have the same content in two spots on the visual tree.
if (_oldContentPresenter != null)
{
_oldContentPresenter.Content = null;
}
if (_storedOldTransition != null)
{
_storedOldTransition.Stop();
}
_storedNavigationOutTransition = null;
_storedOldTransition = null;
if (_storedNewTransition != null)
{
_storedNewTransition.Stop();
_storedNewTransition = null;
_storedNavigationInTransition = null;
}
_performingExitTransition = false;
}
}
/// <summary>
/// Sets a
/// <see cref="T:Microsoft.Phone.Controls.NavigationTransition"/>s
/// to
/// <see cref="M:Microsoft.Phone.Controls.TransitionService.NavigationOutTransitionProperty"/>
/// for a
/// <see cref="T:System.Windows.UIElement"/>.
/// </summary>
/// <param name="element">The <see cref="T:System.Windows.UIElement"/>.</param>
/// <param name="value">The <see cref="T:Microsoft.Phone.Controls.NavigationTransition"/>.</param>
/// <returns>The </returns>
public static void SetNavigationOutTransition(UIElement element, TelegramNavigationOutTransition value)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
element.SetValue(NavigationOutTransitionProperty, value);
}
/// <summary>
/// Handles the Navigating event of the frame, the immediate way to
/// begin a transition out before the new page has loaded or had its
/// layout pass.
/// </summary>
/// <param name="sender">The source object.</param>
/// <param name="e">The event arguments.</param>
private void OnNavigating(object sender, NavigatingCancelEventArgs e)
{
//if (e.NavigationMode == NavigationMode.Reset
// || e.Uri.OriginalString == "app://external/"
// || e.Uri.OriginalString.StartsWith("/Protocol?encodedLaunchUri"))
//|| e.Uri.OriginalString.Contains("msg_id"))
// return;
// If the current application is not the origin
// and destination of the navigation, ignore it.
// e.g. do not play a transition when the
// application gets deactivated because the shell
// will animate the frame out automatically.
if (!e.IsNavigationInitiator)
{
return;
}
_isForwardNavigation = e.NavigationMode != NavigationMode.Back;
var oldElement = Content as UIElement;
if (oldElement == null)
{
return;
}
EnsureLastTransitionIsComplete();
FlipPresenters();
TransitionElement oldTransitionElement = null;
TelegramNavigationOutTransition navigationOutTransition = null;
ITransition oldTransition = null;
if (!e.Uri.OriginalString.Contains("msg_id") &&
!e.Uri.OriginalString.Contains("SecondaryTile") &&
!e.Uri.OriginalString.StartsWith("/Protocol?encodedLaunchUri") &&
!e.Uri.OriginalString.Contains("rndParam") &&
!(e.Uri.OriginalString == "/Views/ShellView.xaml" && e.NavigationMode == NavigationMode.New) &&
!(e.Uri.OriginalString.StartsWith("/Views/Additional/SettingsView.xaml?Action=DC_UPDATE")))
{
navigationOutTransition = TelegramTransitionService.GetNavigationOutTransition(oldElement);
}
if (navigationOutTransition != null)
{
oldTransitionElement = _isForwardNavigation ? navigationOutTransition.Forward : navigationOutTransition.Backward;
}
if (oldTransitionElement != null)
{
oldTransition = oldTransitionElement.GetTransition(oldElement);
}
if (oldTransition != null)
{
EnsureStoppedTransition(oldTransition);
_storedNavigationOutTransition = navigationOutTransition;
_storedOldTransition = oldTransition;
oldTransition.Completed += OnExitTransitionCompleted;
_performingExitTransition = true;
PerformTransition(navigationOutTransition, _oldContentPresenter, oldTransition);
PrepareContentPresenterForCompositor(_oldContentPresenter);
}
else
{
_readyToTransitionToNewContent = true;
}
}
