private static void OnOpened(object sender, EventArgs e)
{
var popup = sender as Popup;
if (popup != null)
{
var target = popup.PlacementTarget as FrameworkElement;
if (target != null)
{
if (popup.Child != null)
{
var root = VisualTreeHelperExtensions.FindTopLevelParent(popup.Child) as Visual;
if (root != null)
{
var realPosition = root.PointToScreen(new Point(0d, 0d));
var calculatedPosition = target.PointToScreen(new Point(0d + popup.HorizontalOffset, target.ActualHeight - popup.VerticalOffset));
var isDefaultHorizontalPosition = Math.Abs(realPosition.X - calculatedPosition.X) < double.Epsilon;
var isDefaultVerticalPosition = Math.Abs(realPosition.Y - calculatedPosition.Y) < double.Epsilon;
SetIsDefaultHorizontalPosition(popup, isDefaultHorizontalPosition);
SetIsDefaultVerticalPosition(popup, isDefaultVerticalPosition);
}
}
}
}
}
private void OnDropDownOpened(object sender, EventArgs e)
{
if (HasSubmenu)
{
Mouse.Capture((IInputElement)VisualTreeHelperExtensions.FindTopLevelParent(Submenu), CaptureMode.SubTree);
OnDropDownOpened(e);
}
}
private void OnDropDownOpened(object sender, EventArgs e)
{
if (HasSubmenu)
{
// HasSubmenu ensures that Submenu isn't null
Contract.Assume(Submenu != null);
Mouse.Capture((IInputElement)VisualTreeHelperExtensions.FindTopLevelParent(Submenu), CaptureMode.SubTree);
OnDropDownOpened(e);
}
}
private void ApplyTemplateInternal()
{
if (Template != null)
{
if (_popup != null)
{
_popup.Child = null;
if (Submenu != null)
{
var popupRootInstance = VisualTreeHelperExtensions.FindTopLevelParent(Submenu);
if (popupRootInstance != null)
{
var presentationFramework = Assembly.GetAssembly(typeof(System.Windows.Window));
if (presentationFramework != null)
{
var popupRoot = presentationFramework.GetType("System.Windows.Controls.Primitives.PopupRoot");
if (popupRoot != null)
{
var popupRootChild = popupRoot.GetProperty("Child",
BindingFlags.Instance | BindingFlags.SetProperty | BindingFlags.NonPublic);
if (popupRootChild != null)
{
popupRootChild.SetValue(popupRootInstance, null, null);
}
}
}
}
}
_popup.Closed -= OnDropDownClosed;
_popup.Opened -= OnDropDownOpened;
_popup.CustomPopupPlacementCallback = null;
}
// Bug in Code Contracts static checker: Template is already checked to null
Contract.Assume(Template != null);
_popup = Template.FindName(PopupName, this) as Popup;
if (_popup == null)
{
Trace.TraceError(PopupName + " not found.");
}
else
{
_popup.CustomPopupPlacementCallback = PlacePopup;
_popup.Opened += OnDropDownOpened;
_popup.Closed += OnDropDownClosed;
if (Submenu != null)
{
_popup.Child = Submenu;
}
}
}
}
