private static void MiddleClickCommand_PropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var Element = o as FrameworkElement;
if (Element == null)
{
throw new ArgumentException("Type mismatch", "o");
}
var Value = (ICommand)e.NewValue;
var Listener = GetMiddleClickCommandWeakEventListener(Element);
if (Value != null)
{
if (Listener == null)
{
Listener = new MiddleClickCommandEventListener();
}
SetMiddleClickCommandWeakEventListener(Element, Listener);
PreviewMouseDownEventManager.AddListener(Element, Listener);
}
else if (Listener != null)
{
SetMiddleClickCommandWeakEventListener(Element, null);
PreviewMouseDownEventManager.RemoveListener(Element, Listener);
}
}
private static void DoDragMove_PropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var Element = o as FrameworkElement;
if (Element == null)
{
throw new ArgumentException("Type mismatch", "o");
}
var Value = (bool)e.NewValue;
var DownListener = GetDoDragMoveMouseDownWeakEventListenerProperty(Element);
var MoveListener = GetDoDragMoveMouseMoveWeakEventListenerProperty(Element);
if (Value)
{
if (MoveListener == null)
{
MoveListener = new DoDragMoveMouseMoveEventListener();
}
if (DownListener == null)
{
DownListener = new DoDragMoveMouseDownEventListener();
}
SetDoDragMoveMouseMoveWeakEventListenerProperty(Element, MoveListener);
SetDoDragMoveMouseDownWeakEventListenerProperty(Element, DownListener);
PreviewMouseMoveEventManager.AddListener(Element, MoveListener);
PreviewMouseDownEventManager.AddListener(Element, DownListener);
}
else
{
if (MoveListener != null)
{
SetDoDragMoveMouseMoveWeakEventListenerProperty(Element, null);
PreviewMouseMoveEventManager.RemoveListener(Element, MoveListener);
}
if (DownListener != null)
{
SetDoDragMoveMouseDownWeakEventListenerProperty(Element, null);
PreviewMouseDownEventManager.RemoveListener(Element, DownListener);
}
}
}