/// <summary>
/// Adds a Metro Dialog instance to the specified window and makes it visible asynchronously.
/// If you want to wait until the user has closed the dialog, use <see cref="ShowMetroDialogAsyncAwaitable"/>
/// <para>You have to close the resulting dialog yourself with <see cref="HideMetroDialogAsync"/>.</para>
/// </summary>
/// <param name="window">The owning window of the dialog.</param>
/// <param name="dialog">The dialog instance itself.</param>
/// <param name="settings">An optional pre-defined settings instance.</param>
/// <returns>A task representing the operation.</returns>
/// <exception cref="InvalidOperationException">The <paramref name="dialog"/> is already visible in the window.</exception>
public Task ShowMetroDialogAsync(
IMetroWindow metroWindow
, IBaseMetroDialogFrame dialog
, IMetroDialogFrameSettings settings = null)
{
metroWindow.Dispatcher.VerifyAccess();
if (metroWindow.MetroActiveDialogContainer.Children.Contains(dialog as UIElement) || metroWindow.MetroInactiveDialogContainer.Children.Contains(dialog as UIElement))
{
throw new InvalidOperationException("The provided dialog is already visible in the specified window.");
}
return(this.HandleOverlayOnShow(metroWindow, settings).ContinueWith(z =>
{
return (Task)metroWindow.Dispatcher.Invoke(new Func <Task>(() =>
{
settings = settings ?? new MetroDialogFrameSettings();
SizeChangedEventHandler sizeHandler = this.SetupAndOpenDialog(metroWindow, dialog);
dialog.SizeChangedHandler = sizeHandler;
return dialog.WaitForLoadAsync().ContinueWith(x =>
{
dialog.OnShown();
if (DialogOpened != null)
{
metroWindow.Dispatcher.BeginInvoke(new Action(() => DialogOpened(this, new DialogStateChangedEventArgs())));
}
});
}));
}).Unwrap());
}
private SizeChangedEventHandler SetupAndOpenDialog(
IMetroWindow metroWindow
, IBaseMetroDialogFrame dialog)
{
dialog.SetZIndex((int)metroWindow.OverlayBox.GetValue(Panel.ZIndexProperty) + 1);
dialog.MinHeight = metroWindow.ActualHeight / 4.0;
dialog.MaxHeight = metroWindow.ActualHeight;
SizeChangedEventHandler sizeHandler = (sender, args) =>
{
dialog.MinHeight = metroWindow.ActualHeight / 4.0;
dialog.MaxHeight = metroWindow.ActualHeight;
};
metroWindow.SizeChanged += sizeHandler;
this.AddDialog(metroWindow, dialog);
dialog.OnShown();
return(sizeHandler);
}