protected static Task <T> ShowDialogAsync <T>(object context, CloseableViewModelBase <T> viewModel, BaseMetroDialog view,
Action?onShown = null)
{
var metroWindow = GetMetroWindow(context);
return(metroWindow.Invoke(() => metroWindow.ShowDialogAsync(viewModel, view, onShown)));
}
/// <summary>
/// Sets up the connection between view and viewModel, shows the view as a metro dialog,
/// calls <paramref name="onShown"/> and waits for the dialog to be closed.
/// </summary>
public static async Task <T> ShowDialogAsync <T>(this MetroWindow window, CloseableViewModelBase <T> viewModel,
BaseMetroDialog view, Action?onShown = null)
{
view.DataContext = viewModel;
// Undefault buttons not in the dialog as they would be pressed instead of a dialog button on enter.
var oldDefaults = window.FindVisualChildren <Button>().Where(b => b.IsDefault).ToList();
oldDefaults.ForEach(b => b.IsDefault = false);
// Save old keyboard focus.
var oldFocus = Keyboard.FocusedElement;
await window.ShowMetroDialogAsync(view, new MetroDialogSettings { AnimateShow = false });
// Focus the first focusable element in the view
var element = view.FindVisualChildren <UIElement>().FirstOrDefault(e => e.Focusable);
element?.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => Keyboard.Focus(element)));
onShown?.Invoke();
var result = await viewModel.WaitForCloseAsync();
await window.HideMetroDialogAsync(view, new MetroDialogSettings { AnimateHide = false });
// Restore IsDefault and keyboard focus.
oldDefaults.ForEach(b => b.IsDefault = true);
Keyboard.Focus(oldFocus);
return(result);
}
