WPF从树视图中删除的ScrollViewer [英] WPF Remove ScrollViewer from TreeView

问题描述

我想知道，如果它可以很容易地关掉TreeView的ScrollViewer中。

I was wondering if it is possible to turn off the TreeView's ScrollViewer easily.

我有一个格一个用户控件。一项所述的细胞具有的StackPanel内几的TreeView。控制的高度的纸型自动取决于的TreeView的高度，所以也没有必要为一个滚动条。

I have a UserControl with a Grid. One of the Cells has a few TreeViews inside a Stackpanel. The height of the Control sizes automatically depending on the height of the TreeViews, so there is no need for a scrollbar.

现在的问题是：我有一大堆的这些符合自己的ScrollViewer列表框，但是当我使用鼠标滚轮，滚动停止时，你是在一个TreeView。

The problem is: I have a bunch of these in a ListBox with its own ScrollViewer, but when i am using the MouseWheel, scrolling stops when you are over a TreeView.

这是因为TreeView控件都有自己的ScrollViewer用于窃取鼠标滚轮。我知道这可能是可以通过修改控制模板，但我希望有一个更简单的方法。

This is because the TreeView has its own ScrollViewer which steals the MouseWheel. I know this is probably possible by overriding the control template, but I hope there is an easier way.

推荐答案

您可以使用技术说明如下： http://serialseb.blogspot.com/2007/ 09 / WPF的提示-6-防止-的ScrollViewer-from.html ，以防止由ScrollViewer中正在处理的鼠标滚轮事件。添加 PreviewMouseWheel =HandlePreviewMouseWheel您TreeView和定义HandlePreviewMouseWheel为：

You can use the technique described here: http://serialseb.blogspot.com/2007/09/wpf-tips-6-preventing-scrollviewer-from.html to prevent the mouse wheel events from being handled by the ScrollViewer. Add PreviewMouseWheel="HandlePreviewMouseWheel" to your TreeView and define HandlePreviewMouseWheel as:

private void HandlePreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    if (!e.Handled)
    {
        e.Handled = true;
        var eventArg = new MouseWheelEventArgs(
            e.MouseDevice, e.Timestamp, e.Delta);
        eventArg.RoutedEvent = UIElement.MouseWheelEvent;
        eventArg.Source = sender;
        var parent = ((Control)sender).Parent as UIElement;
        parent.RaiseEvent(eventArg);
    }
}

更​​改控制模板不包括的ScrollViewer ISN ŧ难，不过，由于TreeView控件的默认模板非常简单，大部分的复杂性正在处理的ScrollViewer。试着这样做：

Changing the control template to not include a ScrollViewer isn't that hard, though, since the default template for TreeView is pretty simple, and most of the complexity is handling the ScrollViewer. Try doing this:

<TreeView.Template>
    <ControlTemplate TargetType="TreeView">
        <Border BorderBrush="{TemplateBinding BorderBrush}"
                BorderThickness="{TemplateBinding BorderThickness}"
                SnapsToDevicePixels="true">
            <ItemsPresenter/>
        </Border>
    </ControlTemplate>
</TreeView.Template>

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