public void On_Capture_Transfer_PointerCaptureLost_Should_Propagate_Up_To_The_Common_Parent()
{
Border initialParent, initialCapture, newParent, newCapture;
var el = new StackPanel
{
Children =
{
(initialParent = new Border {
Child = initialCapture = new Border()
}),
(newParent = new Border {
Child = newCapture = new Border()
})
}
};
var receivers = new List <object>();
var root = new TestRoot(el);
foreach (InputElement d in root.GetSelfAndVisualDescendants())
{
d.PointerCaptureLost += (s, e) => receivers.Add(s);
}
var pointer = new Pointer(Pointer.GetNextFreeId(), PointerType.Mouse, true);
pointer.Capture(initialCapture);
pointer.Capture(newCapture);
Assert.True(receivers.SequenceEqual(new[] { initialCapture, initialParent }));
receivers.Clear();
pointer.Capture(null);
Assert.True(receivers.SequenceEqual(new object[] { newCapture, newParent, el, root }));
}
