/// <summary>
/// Constructor
/// </summary>
/// <param name="displayLocation"> The <see cref="DialogDisplayLocation"/> of this <see cref="DialogHandler"/>. </param>
/// <param name="dialogViewProvider"> <see cref="DialogAssemblyViewProvider"/> used to obtain the proper view for an <see cref="IDialogContainerViewModel"/>. </param>
public DialogHandler
(
DialogDisplayLocation displayLocation,
DialogAssemblyViewProvider dialogViewProvider
)
{
// Save parameters.
this.DisplayLocation = displayLocation;
_containerViewModel = new DialogContainerViewModel();
// Initialize fields.
_containerView = dialogViewProvider.GetViewInstance(_containerViewModel);
_dialogs = new ConcurrentStack <Dialog>();
this.IsInitialized = false;
}
/// <summary>
/// Initializes the current instance once the original framework <paramref name="element"/> has been loaded.
/// </summary>
/// <param name="element"> The <see cref="Visual"/> that will be used to display a dialog. </param>
/// <param name="dialogContainerView"> The view for the <paramref name="dialogContainerViewModel"/>. </param>
/// <param name="dialogContainerViewModel"> The <see cref="IDialogContainerViewModel"/> view model. </param>
private void Initialize(Visual element, Visual dialogContainerView, IDialogContainerViewModel dialogContainerViewModel)
{
// Get the adorner layer.
_adornerLayer = DialogHandler.GetAdornerLayer(element, out var adornedVisual);
// Check if the really adorned visual is of a UIElement.
if (!(adornedVisual is UIElement adornedElement))
{
throw new DialogException($"The adorned element '{adornedVisual}' is not of type '{nameof(UIElement)}'");
}
// Save the adorned element.
_adornedElement = adornedElement;
// Create a content adorner.
_contentAdorner = new ContentAdorner(adornedElement, dialogContainerView);
// Modify the dialog container view.
if (dialogContainerView is FrameworkElement dialogContainerElement)
{
// Make the dialog container view focusable, so that key events will be received.
dialogContainerElement.Focusable = true;
// Handle the loaded event of the dialog container view.
void LoadedHandler(object sender, RoutedEventArgs args)
{
dialogContainerElement.Loaded -= LoadedHandler;
// Focus the dialog container view once it is loaded.
dialogContainerElement.Focus();
// Attach key up events from the view to the handler in the view model.
dialogContainerElement.PreviewKeyUp -= dialogContainerViewModel.HandleKeyUp;
dialogContainerElement.PreviewKeyUp += dialogContainerViewModel.HandleKeyUp;
}
dialogContainerElement.Loaded += LoadedHandler;
if (dialogContainerElement.IsLoaded)
{
LoadedHandler(null, new RoutedEventArgs());
}
}
this.OnInitialized();
}
