public void Dispose()
{
if (_shouldUpdatePosition)
{
_shouldUpdatePosition = false;
if (_contextMenu != null)
{
_contextMenu.ClearValue(ContextMenu.HorizontalOffsetProperty);
_contextMenu.ClearValue(ContextMenu.VerticalOffsetProperty);
}
else if (_toolTip != null)
{
_toolTip.ClearValue(System.Windows.Controls.ToolTip.HorizontalOffsetProperty);
_toolTip.ClearValue(System.Windows.Controls.ToolTip.VerticalOffsetProperty);
}
else if (_popup != null)
{
_popup.ClearValue(Popup.HorizontalOffsetProperty);
_popup.ClearValue(Popup.VerticalOffsetProperty);
}
}
_contextMenu = null;
_toolTip = null;
_popup = null;
}
private static void SetAllowsTransparencyInternal(Control element, Object value)
{
ToolTip tooTip = element as ToolTip;
ContextMenu contextMenu = element as ContextMenu;
// Set the IsOpen property to true to let the ToolTip/ContextMenu create Popup instance early, since
// we are only interesting in Popup.AllowsTransparency property rather than
// opening the ToolTip/ContextMenu, set its Visibility to Collapsed.
element.Visibility = Visibility.Collapsed;
if (tooTip != null)
{
tooTip.IsOpen = true;
}
else if (contextMenu != null)
{
contextMenu.IsOpen = true;
}
//Find the Popup logical element root.
Popup popup = GetPopupFromVisualChild(element);
if (popup != null)
{
popup.SetValue(Popup.AllowsTransparencyProperty, value);
}
//Set properties back to what it is initially.
if (tooTip != null)
{
tooTip.ClearValue(ToolTip.IsOpenProperty);
}
else if (contextMenu != null)
{
contextMenu.ClearValue(ToolTip.IsOpenProperty);
}
element.ClearValue(FrameworkElement.VisibilityProperty);
}