C＃Windows Phone 7的框滚动up / down事件？ [英] C# Windows Phone 7 ListBox Scrolling Up / Down event?

问题描述

我要寻找一个办法知道当用户滚动在我的Windows Phone 7应用程序向上或向下的列表框。

I am looking for a way to know when a user is scrolling the listbox on my Windows Phone 7 application up or down.

我能来最接近

    private double fDown = 0.6;

    private void buddyList_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
    {
        var sView = e.ManipulationContainer as ScrollViewer;

        double lBox = 25 - fDown;

        double nBox = 25 - sView.VerticalOffset;

        if (nBox > lBox)
            MessageBox.Show("up!");
        else
            MessageBox.Show("down!");
    }

不过，这并不正常工作。我需要知道什么时候它是在比较，通过它的中间滚动列表框的底部。

However, that doesn't work correctly. I need to know when it's at the bottom of the listbox compared to scrolling through the middle of it.

当它在列表框的底部，我想启用定时器以保持它在底部不断。还是有另一种方式来保持它在不断地底......？有反正我可以做到这一点？

When it's at the bottom of the listbox I want to enable a timer to keep it at the bottom constantly. Or is there another way to keep it at the bottom constantly...? Is there anyway I can do this?

感谢。

推荐答案

我跟一个朋友，他给了我这个作为一个答案（的人谁在futue看起来）：

I talked to a friend and he gave me this as an answer (to anyone who looks in the futue):

        var sView = e.ManipulationContainer as ScrollViewer;

        double lBox = 25 - sView.ScrollableHeight;

        double nBox = 25 - sView.VerticalOffset;

        if (lBox < nBox)
            //Listbox Scrolled Up
        else
            //Listbox at Bottom

感谢。

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