private void App_BackRequested(object sender, BackRequestedEventArgs e)
{
OnBackRequested?.Invoke(this, e);
if (!e.Handled)
{
if (Frame.CanGoBack)
{
Frame.GoBack();
e.Handled = true;
}
}
}
/// <summary>
/// Virtual method used by the <see cref="GoBackCommand"/> property
/// to invoke the <see cref="Windows.UI.Xaml.Controls.Frame.GoBack()"/> method.
/// </summary>
public virtual void GoBack()
{
if (Frame != null && Frame.CanGoBack)
{
FrameBackRequestedEventArgs eventArgs = new FrameBackRequestedEventArgs();
OnBackRequested?.Invoke(this, eventArgs);
if (eventArgs == null || !eventArgs.IsHandled)
{
Frame.GoBack();
}
}
}
private void AppBackRequested(object sender, BackRequestedEventArgs e)
{
OnBackRequested?.Invoke(this, e);
if (!e.Handled)
{
// Default is to navigate back within the Frame
Frame frame = Window.Current.Content as Frame;
if (frame.CanGoBack)
{
frame.GoBack();
// Signal handled so that system doesn't navigate back through app stack
e.Handled = true;
}
}
}
private void AppBackRequested(object sender, BackRequestedEventArgs e)
{
OnBackRequested?.Invoke(this, e);
if (!e.Handled)
{
// Default is to navigate back within the Frame
Frame frame = Window.Current.Content as Frame;
if (frame.CanGoBack)
{
frame.GoBack();
// Signal handled so that system doesn't navigate back through app stack
e.Handled = true;
}
}
}
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
#if DEBUG
if (Debugger.IsAttached)
{
DebugSettings.EnableFrameRateCounter = true;
}
#endif
var rootFrame = Window.Current.Content as Frame;
if (rootFrame == null)
{
rootFrame = new Frame();
rootFrame.NavigationFailed +=
(sender, args) => { throw new Exception("Failed to load Page " + args.SourcePageType.FullName); };
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Zustand von zuvor angehaltener Anwendung laden
}
Window.Current.Content = rootFrame;
//Handle the BackRequested Event
SystemNavigationManager.GetForCurrentView().BackRequested += (sender, eventArgs) =>
{
//If an EventHandler is registered for the OnBackRequested event: call it
//Maybe the EventHandler will handled this event
OnBackRequested?.Invoke(this, eventArgs);
if (!eventArgs.Handled)
{
var frame = Window.Current.Content as Frame;
if (frame != null && frame.CanGoBack) //If we can go back, go back
{
eventArgs.Handled = true;
frame.GoBack();
}
}
};
//Whenever we navigate to a new page, set the AppViewBackButton to visible if we can go back, to collapsed if we dont
rootFrame.Navigated += (sender, args) =>
{
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility
= rootFrame.CanGoBack
? AppViewBackButtonVisibility.Visible
: AppViewBackButtonVisibility.Collapsed;
};
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
rootFrame.Navigate(typeof(StartPage), e.Arguments);
}
Window.Current.Activate();
}
}
/// Called when the back button has been tapped
///
public void OnBackTapped()
{
OnBackRequested.SafeInvoke();
}
