可移动的UserControl，停用幻灯片？

Question

我发现这个CodeSnipped WWW。我很好用这个剪切的功能，但我唯一的问题是，当你移动一个UserControl你可以将控制移出窗口，它可以停用它吗？

public void MakeDraggable(System.Windows.UIElement moveThisElement, System.Windows.UIElement movedByElement)
{
    bool isMousePressed = false;
    System.Windows.Media.TranslateTransform transform = new System.Windows.Media.TranslateTransform(0, 0);
    moveThisElement.RenderTransform = transform;
    System.Windows.Point originalPoint = new System.Windows.Point(0, 0), currentPoint;

    movedByElement.MouseLeftButtonDown += (a, b) =>
    {
           isMousePressed = true;
           originalPoint = ((System.Windows.Input.MouseEventArgs)b).GetPosition(moveThisElement);
    };

    movedByElement.MouseLeftButtonUp += (a, b) => isMousePressed = false;

    movedByElement.MouseLeave += (a, b) => isMousePressed = false;

    movedByElement.MouseMove += (a, b) =>
    {
           if (!isMousePressed) return;

           currentPoint = ((System.Windows.Input.MouseEventArgs)b).GetPosition(moveThisElement);

           transform.X += currentPoint.X - originalPoint.X;
           transform.Y += currentPoint.Y - originalPoint.Y;
    };
}

感谢您的帮助，
弗里多林