2010-01-07 114 views

回答

0

我發現這個很髒的修復程序。當ViewPortChanged事件觸發時,我將MultiScaleImage的新更改的ViewportOrigin傳遞給下面的方法。問題是View端口是異步更改的,用戶可以看到圖像被移回到邊界。

public void SetViewportOrigin(Point point) 
    { 
     Point bottomRight = ZoomImage.ElementToLogicalPoint(new Point(ZoomImage.ActualWidth/ZoomImage.ViewportWidth - ZoomImage.ActualWidth, ZoomImage.ActualWidth/(ZoomImage.ViewportWidth * 1.33184438 /*ZoomImage.AspectRatio*/) - ZoomImage.ActualHeight)); 
     bottomRight.X -= ZoomImage.ViewportOrigin.X; 
     bottomRight.Y -= ZoomImage.ViewportOrigin.Y; 

     if (point.X < 0) 
     { //left edge 
      point.X = 0; 
      Debug.WriteLine("left edge"); 
     } 
     else if (point.X > bottomRight.X) 
     {//right edge 
      point.X = bottomRight.X; 
      Debug.WriteLine("right edge"); 
     } 

     if (point.Y > 1.0) 
     {//bottom edge 

      point.Y = 1.0; 
      Debug.WriteLine("bottom edge1"); 
     } 

     if (point.Y < 0) 
     {//top edge 
      point.Y = 0; 
      Debug.WriteLine("top edge"); 
     } 
     else if (point.Y > bottomRight.Y) //bottom edge 
     { 
      point.Y = bottomRight.Y; 
     } 

     ZoomImage.ViewportOrigin = point; 
    }