在不同的DataTemplates创建了两个ScrollViewers之间共享Horizo​​ntalOffset

问题描述

我有两个ItemsControls，使用相同的集合作为一个的ItemsSource。这两个ItemsControls的ItemTemplate非常相似：同时存在的DataTemplates内的ScrollViewer

I've got two ItemsControls, which use the same collection as an ItemsSource. ItemTemplates for both ItemsControls are very similar: there is a ScrollViewer inside both DataTemplates.

问：

如果我在第一个的ItemsControl生成的ScrollViewers之一变Horizo​​ntalOffset，我怎么可以从第二ItemsControl的滚动的ScrollViewer，具有相同的物体作为一个DataContext 后，以同样的Horizo​​ntalOffset？

If I change HorizontalOffset in one of the ScrollViewers generated in the first ItemsControl, how can I scroll the ScrollViewer from the second ItemsControl, which has the same object as a DataContext, to the same HorizontalOffset?

推荐答案

由于雷切尔提到的，可能有许多关于你的问题的解决方案。然而，我所看见的事都有点复杂或对我来说并不简单。所以，我以为这样一来，这是非常简单，可以将所有具有的ScrollViewer中的VisualTree控制。

As Rachel mentioned, there may be lots of solutions about your problem. However, the things that I have seen are a little complex or not simple for me. So, I thought this way, which is very simple and can apply all the control which has ScrollViewer in VisualTree.

以下code假定两个控件，具有的ScrollViewer中的VisualTree，在XAML中已经定义，它被命名为控制1 和控制2在我的$ C $ C。

The following code assumes that the two controls, having ScrollViewer in VisualTree, are already defined in Xaml, which are named control1 and control2 in my code.

public partial class MainWindow : Window
{
    private ScrollViewer _scrollViewer1;
    private ScrollViewer _scrollViewer2;

    public MainWindow()
    {
        InitializeComponent();
        Loaded += (s, e) =>
                    {
                        _scrollViewer1 = FindScrollViewer(**control1**);
                        _scrollViewer2 = FindScrollViewer(**control2**);
                        if (_scrollViewer1 == null || _scrollViewer2 == null) throw new InvalidOperationException();
                        _scrollViewer1.ScrollChanged += ScrollViewer1ScrollChanged;
                        _scrollViewer2.ScrollChanged += ScrollViewer2ScrollChanged;
                    };
    }

    private ScrollViewer FindScrollViewer(Visual visual)
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(visual); i++)
        {
            var visualChild = VisualTreeHelper.GetChild(visual, i) as Visual;
            if (visualChild == null) continue;
            var scrollViewer = visualChild as ScrollViewer;
            if (scrollViewer != null)
            {
                return scrollViewer;
            }
            return FindScrollViewer(visualChild);
        }
        return null;
    }

    private void ScrollViewer1ScrollChanged(object sender, ScrollChangedEventArgs e)
    {
        _scrollViewer2.ScrollToVerticalOffset(_scrollViewer1.VerticalOffset);
    }

    private void ScrollViewer2ScrollChanged(object sender, ScrollChangedEventArgs e)
    {
        _scrollViewer1.ScrollToVerticalOffset(_scrollViewer2.VerticalOffset);
    }
}

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