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);
            }
        }
Пример #2
0
        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);
                }
            }
        }