public void TestPropagateEvent()
{
// create a hierarchy of UIElements
// (00)
// |
// (10)
// / \
// (20) (21)
// | / \
// (30) (31) (32)
var element00 = new ContentControlTest();
var element10 = new StackPanel();
var element20 = new ContentControlTest();
var element21 = new StackPanel();
var element30 = new UIElementLayeringTests();
var element31 = new UIElementLayeringTests();
var element32 = new UIElementLayeringTests();
element00.Content = element10;
element10.Children.Add(element20);
element10.Children.Add(element21);
element20.Content = element30;
element21.Children.Add(element31);
element21.Children.Add(element32);
var elements = new List <UIElement> {
element00, element10, element20, element21, element30, element31, element32
};
// create routed events
var tunnelingEvent = EventManager.RegisterRoutedEvent <RoutedEventArgs>("TestTuneling", RoutingStrategy.Tunnel, typeof(UIElementLayeringTests));
var bubblingEvent = EventManager.RegisterRoutedEvent <RoutedEventArgs>("TestBubbling", RoutingStrategy.Bubble, typeof(UIElementLayeringTests));
var directEvent = EventManager.RegisterRoutedEvent <RoutedEventArgs>("TestDirect", RoutingStrategy.Direct, typeof(UIElementLayeringTests));
// test propagation direction, propagation bounds and sender values
foreach (var uiElement in elements)
{
uiElement.AddHandler(tunnelingEvent, TestAddSenderToList);
uiElement.AddHandler(bubblingEvent, TestAddSenderToList);
uiElement.AddHandler(directEvent, TestAddSenderToList);
}
// tunneling test 1
senderList.Clear();
element20.RaiseEvent(new RoutedEventArgs(tunnelingEvent));
Assert.Equal(3, senderList.Count);
Assert.Equal(element00, senderList[0]);
Assert.Equal(element10, senderList[1]);
Assert.Equal(element20, senderList[2]);
// tunneling test 2
senderList.Clear();
element31.RaiseEvent(new RoutedEventArgs(tunnelingEvent));
Assert.Equal(4, senderList.Count);
Assert.Equal(element00, senderList[0]);
Assert.Equal(element10, senderList[1]);
Assert.Equal(element21, senderList[2]);
Assert.Equal(element31, senderList[3]);
// direct test
senderList.Clear();
element10.RaiseEvent(new RoutedEventArgs(directEvent));
Assert.Equal(1, senderList.Count);
Assert.Equal(element10, senderList[0]);
// tunneling test 1
senderList.Clear();
element30.RaiseEvent(new RoutedEventArgs(bubblingEvent));
Assert.Equal(4, senderList.Count);
Assert.Equal(element30, senderList[0]);
Assert.Equal(element20, senderList[1]);
Assert.Equal(element10, senderList[2]);
Assert.Equal(element00, senderList[3]);
// tunneling test 2
senderList.Clear();
element20.RaiseEvent(new RoutedEventArgs(bubblingEvent));
Assert.Equal(3, senderList.Count);
Assert.Equal(element20, senderList[0]);
Assert.Equal(element10, senderList[1]);
Assert.Equal(element00, senderList[2]);
// test with another type of handler
var eventMyTestHandler = EventManager.RegisterRoutedEvent <MyTestRoutedEventArgs>("TestMyTestHandler", RoutingStrategy.Direct, typeof(UIElementLayeringTests));
AddHandler(eventMyTestHandler, TestMyTestHandler);
RaiseEvent(new MyTestRoutedEventArgs(eventMyTestHandler));
Assert.Equal(true, testMyTestHandlerCalled);
// test Handled and EventHandledToo
foreach (var uiElement in elements)
{
uiElement.RemoveHandler(bubblingEvent, TestAddSenderToList);
uiElement.AddHandler(bubblingEvent, TestHandledHandler);
}
senderList.Clear();
element00.AddHandler(bubblingEvent, TestEventHandledHandler, true);
element32.RaiseEvent(new RoutedEventArgs(bubblingEvent));
Assert.Equal(1, senderList.Count);
Assert.Equal(element32, senderList[0]);
Assert.Equal(true, testEventHandledTooCalled);
// test class handlers basic working
foreach (var uiElement in elements)
{
uiElement.RemoveHandler(bubblingEvent, TestHandledHandler);
}
EventManager.RegisterClassHandler(typeof(ContentControl), bubblingEvent, TestAddSenderToClassHandlerList);
element30.RaiseEvent(new RoutedEventArgs(bubblingEvent));
Assert.Equal(2, classHandlerSenderList.Count);
Assert.Equal(element20, classHandlerSenderList[0]);
Assert.Equal(element00, classHandlerSenderList[1]);
// test that class handlers are called before instance handlers + test handledEventToo for class handlers
senderList.Clear();
classHandlerSenderList.Clear();
EventManager.RegisterClassHandler(typeof(ContentControl), bubblingEvent, TestClassHandlerHandled);
EventManager.RegisterClassHandler(typeof(StackPanel), bubblingEvent, TestClassHandlerEventHandled, true);
foreach (var uiElement in elements)
{
uiElement.AddHandler(bubblingEvent, TestAddSenderToList);
}
element20.RaiseEvent(new RoutedEventArgs(bubblingEvent));
Assert.Equal(1, classHandlerSenderList.Count);
Assert.Equal(element20, classHandlerSenderList[0]);
Assert.Equal(0, senderList.Count);
Assert.Equal(true, testClassHandlerEventHandledTooCalled);
}