/// <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, CloseableViewModel <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);
// Clear keyboard focus as they focused element is pressed instead of a dialog element on enter.
var oldFocus = Keyboard.FocusedElement;
Keyboard.ClearFocus();
await window.ShowMetroDialogAsync(view, new MetroDialogSettings { AnimateShow = false });
DialogParticipation.SetRegister(view, viewModel);
onShown?.Invoke();
var result = await viewModel.WaitForCloseAsync();
await window.HideMetroDialogAsync(view, new MetroDialogSettings { AnimateHide = false });
DialogParticipation.SetRegister(view, null);
// Restore IsDefault and keyboard focus.
oldDefaults.ForEach(b => b.IsDefault = true);
Keyboard.Focus(oldFocus);
return(result);
}
/// <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, CloseableViewModel <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 });
DialogParticipation.SetRegister(view, viewModel);
// 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 });
DialogParticipation.SetRegister(view, null);
// Restore IsDefault and keyboard focus.
oldDefaults.ForEach(b => b.IsDefault = true);
Keyboard.Focus(oldFocus);
return(result);
}
protected static MetroWindow GetMetroWindow(object context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (!DialogParticipation.IsRegistered(context))
{
throw new InvalidOperationException(
"Context is not registered. Consider using DialogParticipation.Register in XAML to bind in the DataContext.");
}
var association = DialogParticipation.GetAssociation(context);
var metroWindow = association.Invoke(() => Window.GetWindow(association) as MetroWindow);
if (metroWindow == null)
{
throw new InvalidOperationException("Control is not inside a MetroWindow.");
}
return(metroWindow);
}
private static async Task <MetroWindow> GetMetroWindowAsync(object context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (!DialogParticipation.IsRegistered(context))
{
var tcs = new TaskCompletionSource <DependencyObject>();
ContextRegistrationChangedEventHandler handler = null;
handler = (c, o) =>
{
if (c == context)
{
DialogParticipation.ContextRegistrationChanged -= handler;
tcs.TrySetResult(o);
}
};
DialogParticipation.ContextRegistrationChanged += handler;
var task = tcs.Task;
if (await task.WithTimeout(TimeSpan.FromSeconds(2)))
{
return(AssociationToWindow(task.Result));
}
else
{
throw new InvalidOperationException(
"Context is not registered. Consider using DialogParticipation.Register in XAML to bind in the DataContext.");
}
}
var association = DialogParticipation.GetAssociation(context);
return(AssociationToWindow(association));
}
