/// <summary>
/// Called when the value of the
/// <see cref="P:System.Windows.Controls.ContentControl.Content"/>
/// property changes.
/// </summary>
/// <param name="oldContent">The old <see cref="T:System.Object"/>.</param>
/// <param name="newContent">The new <see cref="T:System.Object"/>.</param>
protected override void OnContentChanged(object oldContent, object newContent)
{
base.OnContentChanged(oldContent, newContent);
_contentReady = true;
UIElement oldElement = oldContent as UIElement;
UIElement newElement = newContent as UIElement;
// Require the appropriate template parts plus a new element to
// transition to.
if (_firstContentPresenter == null || _secondContentPresenter == null || newElement == null)
{
return;
}
TelegramNavigationInTransition navigationInTransition = null;
ITransition newTransition = null;
if (newElement != null)
{
navigationInTransition = TelegramTransitionService.GetNavigationInTransition(newElement);
TransitionElement newTransitionElement = null;
if (navigationInTransition != null)
{
newTransitionElement = _isForwardNavigation ? navigationInTransition.Forward : navigationInTransition.Backward;
}
if (newTransitionElement != null)
{
newElement.UpdateLayout();
newTransition = newTransitionElement.GetTransition(newElement);
PrepareContentPresenterForCompositor(_newContentPresenter);
}
}
_newContentPresenter.Opacity = 0;
_newContentPresenter.Visibility = Visibility.Visible;
_newContentPresenter.Content = newElement;
_oldContentPresenter.Opacity = 1;
_oldContentPresenter.Visibility = Visibility.Visible;
_oldContentPresenter.Content = oldElement;
if (_readyToTransitionToNewContent)
{
TransitionNewContent(newTransition, navigationInTransition);
}
else
{
_storedNewTransition = newTransition;
_storedNavigationInTransition = navigationInTransition;
}
}
/// <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;
}
}
