获取Gridview中的可见项（Windows商店）

Question

我正在开发一个Windows应用商店应用程序，它是C＃和Windows框架的新手。我有一个gridview，数据绑定正在使用GridView.ItemTemplate和DataTemplate完成。 Gridview可能在任何时间点都有多个项目。而且我必须只获取用户当前可见的项目。

请建议正确的方法来实现这一目标。一些CODE SNIPPETS非常有用。

提前致谢。

Answer 1

         //I think i found the answer
         //GridList is the list of items inside the GridView    
     //grv is the gridView instance
     //sv is the scrollview
        Rect bounds = Window.Current.Bounds;                        
        double height = bounds.Height;
        double width = bounds.Width;
        var ttf = sv.TransformToVisual(Window.Current.Content);
        Windows.Foundation.Point screenCoordsSv = ttf.TransformPoint(new Windows.Foundation.Point(0, 0));

        foreach (Grid grv in GridList)
        {                
            double gridWidth = grv.Width;


            var ttv = grv.TransformToVisual(Window.Current.Content);
            Windows.Foundation.Point screenCoords = ttv.TransformPoint(new Windows.Foundation.Point(0, 0));

            if ((screenCoords.X >= -(gridWidth + 10)) && (screenCoords.X < width))
            {                    
               //item falls inside the visible area
            }
        }