Question

我使用serveral UserControls作为子级，使用Canvas作为Container来模仿MDI窗口，但是当我拖动UserControl时，它的移动是如此缓慢！事件如下：

GTitle.MouseLeftButtonDown += GTitleMouseButtonDownHandler;
GTitle.MouseMove += MouseMoveHandler;
GTitle.MouseLeftButtonUp += GTitleMouseButtonUp;

和：

private void  GTitleMouseButtonDownHandler(object o,MouseButtonEventArgs e)
{
    oldPoint = e.GetPosition(MyParent); 
    GTitle.CaptureMouse();
}

private void MouseMoveHandler(object o, MouseEventArgs e)
{   
   Point MovePoint = e.GetPosition(MyParent);
   if (GTitle.IsMouseCaptured)
   {
       var offset = MovePoint - oldPoint;
       Position = new Point(Position.X + offset.X, Position.Y + offset.Y);
       oldPoint = MovePoint;
   }
}

private void GTitleMouseButtonUp(object sender, MouseButtonEventArgs e)
{
  if (GTitle.IsMouseCaptured)
      GTitle.ReleaseMouseCapture();
}

public Point Position
{
   get { return (Point)GetValue(PositionProperty); }
   set { SetValue(PositionProperty, value); }
}

public static readonly DependencyProperty PositionProperty =
        DependencyProperty.Register("Position", typeof(Point), typeof(ChildBaseEx2),
        new UIPropertyMetadata(new Point(-1, -1) ,new PropertyChangedCallback(PositionValueChanged)));

 private static void PositionValueChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
 {
    if ((Point)e.NewValue == (Point)e.OldValue)
       return;
    ChildBaseEx2 mdiChild = (ChildBaseEx2)sender;
    Point newPosition = (Point)e.NewValue;
    TranslateTransform translateTransform = mdiChild.RenderTransform as TranslateTransform;
    translateTransform.X = newPosition.X;
    translateTransform.Y = newPosition.Y;
 }

所以，当我拖动鼠标时，Usercontrol可以正常移动，但是速度有点慢，需要帮助，谢谢吗？那里有很多孩子有影响力吗？

WPF，在画布中拖动带有许多子项的UserControl如此缓慢

0 个答案: