private static void HandleDisplay(FragmentContentViewer viewer, ViewModelFragment oldValue, ViewModelFragment newValue)
{
if (oldValue != null)
{
oldValue.Dispose();
}
if (newValue != null)
{
var viewType = FragmentManager.ResolveFragmentView(newValue.GetType());
if (viewType != null)
{
var view = Activator.CreateInstance(viewType) as FrameworkElement;
var newFragment = newValue as ViewModelFragment;
view.DataContext = newFragment;
newFragment.UI.SetUIElement(view, viewer);
viewer.PART_ContentPresenter.Content = view;
if (viewer.AutoInvoke)
{
newFragment.Invoke(viewer.DataContext as ViewModelBase, viewer.InvokeParameter);
}
}
}
else
{
viewer.PART_ContentPresenter.Content = null;
}
}
public async Task <NepAppUIManagerDialogResult> ShowDialogFragmentAsync <T>(object parameter = null) where T : NepAppUIDialogFragment
{
await BeginShowingDialogAsync();
//used to handle resizing the dialog
ApplicationView appView = ApplicationView.GetForCurrentView();
appView.VisibleBoundsChanged += NepAppUIManagerOverlayHandle_VisibleBoundsChanged;
Window.Current.SizeChanged += Current_SizeChanged;
Rect bounds = GetScreenBounds();
ResizeInlineFrameDialog(bounds.Height, bounds.Width);
var fragment = Activator.CreateInstance <T>() as NepAppUIDialogFragment;
var viewType = FragmentManager.ResolveFragmentView <T>();
var view = Activator.CreateInstance(viewType) as Control;
view.DataContext = fragment;
inlineFrame.Content = view;
KeyEventHandler escapeHandler = null;
bool escapeHandlerReleased = false;
escapeHandler = new KeyEventHandler((s, e) =>
{
//handles the escape button. On Xbox, the "B" button counts as Escape here.
if (e.Key == Windows.System.VirtualKey.Escape)
{
e.Handled = true;
view.KeyDown -= escapeHandler;
escapeHandlerReleased = true;
fragment.ResultTaskCompletionSource.SetResult(NepAppUIManagerDialogResult.Declined);
}
});
view.KeyDown += escapeHandler;
var navManager = WindowManager.GetNavigationManagerForCurrentView()
.GetNavigationServiceFromFrameLevel(FrameLevel.Two);
EventHandler <NavigationManagerPreBackRequestedEventArgs> backHandler = null;
bool backHandlerReleased = false;
backHandler = new EventHandler <NavigationManagerPreBackRequestedEventArgs>((o, e) =>
{
//hack to handle the back button.
e.Handled = true;
navManager.PreBackRequested -= backHandler;
backHandlerReleased = true;
fragment.ResultTaskCompletionSource.SetResult(NepAppUIManagerDialogResult.Declined);
});
navManager.PreBackRequested += backHandler;
var result = await fragment.InvokeAsync(parameter);
if (!backHandlerReleased)
{
navManager.PreBackRequested -= backHandler;
}
if (!escapeHandlerReleased)
{
view.KeyDown -= escapeHandler;
}
appView.VisibleBoundsChanged -= NepAppUIManagerOverlayHandle_VisibleBoundsChanged;
Window.Current.SizeChanged -= Current_SizeChanged;
await EndShowingDialogAsync();
fragment.Dispose();
return(result);
}
