public void AddFlyout(string name, Type viewType, Position position, UnloadBehavior unloadBehavior = UnloadBehavior.SaveAndCloseViewModel, FlyoutTheme flyoutTheme = FlyoutTheme.Adapt)
{
Argument.IsNotNullOrWhitespace(() => name);
Argument.IsNotNull(() => viewType);
Log.Info("Adding flyout '{0}' with view type '{1}'", name, viewType.FullName);
var content = (UIElement)_typeFactory.CreateInstance(viewType);
var flyout = new Flyout();
flyout.Theme = flyoutTheme;
flyout.Position = position;
var flyoutInfo = new FlyoutInfo(flyout, content);
// See https://github.com/WildGums/Orchestra/issues/278, we cannot bind this, use workaround for now, see workaround below as well!!!
//flyout.SetBinding(Flyout.HeaderProperty, new Binding("ViewModel.Title") { Source = content });
((ICompositeCommand)_commandManager.GetCommand("Close")).RegisterAction(() => { flyout.IsOpen = false; });
// ViewModelChanged handler (Workaround for https://github.com/WildGums/Orchestra/issues/278)
var vmContainer = content as IViewModelContainer;
EventHandler <EventArgs> viewModelChangedHandler = null;
viewModelChangedHandler = (sender, e) =>
{
var title = vmContainer?.ViewModel?.Title;
if (!string.IsNullOrWhiteSpace(title))
{
flyout.Dispatcher.BeginInvoke(() =>
{
flyout.SetCurrentValue(Flyout.HeaderProperty, title);
});
}
};
vmContainer.ViewModelChanged += viewModelChangedHandler;
// IsOpenChanged handler
RoutedEventHandler isOpenHandler = null;
#pragma warning disable AvoidAsyncVoid
isOpenHandler = async(sender, e) =>
#pragma warning restore AvoidAsyncVoid
{
var vmContainer = flyout.Content as IViewModelContainer;
var vm = vmContainer?.ViewModel;
if (!flyout.IsOpen)
{
if (vm != null)
{
switch (unloadBehavior)
{
case UnloadBehavior.CloseViewModel:
await vm.CloseViewModelAsync(null);
break;
case UnloadBehavior.SaveAndCloseViewModel:
await vm.SaveAndCloseViewModelAsync();
break;
case UnloadBehavior.CancelAndCloseViewModel:
await vm.CancelAndCloseViewModelAsync();
break;
default:
throw new ArgumentOutOfRangeException(nameof(unloadBehavior));
}
}
flyout.Content = null;
flyout.DataContext = null;
flyout.IsOpenChanged -= isOpenHandler;
vmContainer.ViewModelChanged -= viewModelChangedHandler;
}
};
flyout.IsOpenChanged += isOpenHandler;
_flyouts[name] = flyoutInfo;
}