private static void OnControllerChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
Window w = sender as Window;
if (w == null)
{
//sender is a child element
w = Window.GetWindow(sender);
}
if (w != null)
{
ViewControllerBase controller = e.NewValue as ViewControllerBase;
if (controller != null)
{
EventHandler <WindowShouldCloseEventArgs> windowShouldClose = null;
windowShouldClose = (x, y) =>
{
//check if the call is on the same thread as the window
//need to marshal onto UI thread
if (!w.Dispatcher.CheckAccess())
{
//different thread so invoke async on the dispatcher's thread
w.Dispatcher.Invoke(windowShouldClose, x, y);
}
else
{
//ok thread is being called on the same thread as the window
//now check if the current thread is modal, this should mean that the window was shown using ShowDialog
if (ComponentDispatcher.IsThreadModal)
{
//window should be Modal, i.e. a child window that is owned by a parent window
try
{
//set the DialogResult value, close this window and return to the parent window
//this will throw if the Window was not shown using ShowDialog
w.DialogResult = y.DialogResult;
}
catch (InvalidOperationException)
{
}
}
w.Close();
}
};
controller.WindowShouldClose += windowShouldClose;
EventHandler closed = null;
closed = (x, y) =>
{
w.ClearValue(ViewControllerBehaviour.ControllerProperty);
controller.WindowShouldClose -= windowShouldClose;
w.Closed -= closed;
controller.OnWindowClosed();
};
w.Closed += closed;
EventHandler activated = (x, y) => controller.OnWindowActivated();
w.Activated += activated;
EventHandler deactivated = (x, y) => controller.OnWindowDeactivated();
w.Deactivated += deactivated;
}
}
}
