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如何禁用 WPF TreeView 中的双击行为？

发布于 2024-11-08 17:10:41 字数 186 浏览 0 评论 0原文

在我的 TreeView 中，我有不同的 MouseDown/MouseUp 事件，等等，但是当我做得足够快时，TreeView > 展开/折叠TreeNode。我不想要这种固有的行为。

有办法禁用这个吗？

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我不在是我 2024-11-15 17:10:41

您可以抑制 TreeViewItem 的双击事件，如下所示：

xaml:

<TreeView DockPanel.Dock="Left" TreeViewItem.PreviewMouseDoubleClick="TreeViewItem_PreviewMouseDoubleClick">
    <TreeViewItem Header="Node Level 1" IsExpanded="True" >
        <TreeViewItem Header="Node Level 2.1" >
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
        <TreeViewItem Header="Node Level 2.2">
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
    </TreeViewItem>
</TreeView>

code:

private void TreeViewItem_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    //this will suppress the event that is causing the nodes to expand/contract 
    e.Handled = true;
}

UPDATE

根据 msdn 文档：

虽然这个路由事件似乎
沿着隧道路线穿过
元素树，它实际上是一个直接的
沿着引发的路由事件
元素树由每个 UIElement...
控制想要处理的作者
鼠标双击应该使用
PreviewMouseLeftButtonDown 事件时
ClickCount 等于二。这将
导致 Handled 的状态变为
在这种情况下适当传播
其中元素中的另一个元素
树处理该事件。

我不确定这是否是您遇到问题的原因，但我们将按照 MSDN 方式进行操作并使用 PreviewMouseLeftButtonDown 代替：

xaml:

<TreeView DockPanel.Dock="Left" TreeViewItem.PreviewMouseLeftButtonDown="TreeView_PreviewMouseLeftButtonDown">
    <TreeViewItem Header="Node Level 1" IsExpanded="True">
        <TreeViewItem Header="Node Level 2.1" >
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
        <TreeViewItem Header="Node Level 2.2">
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
    </TreeViewItem>
</TreeView>

code:

private void TreeView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount > 1)
    {
        //here you would probably want to include code that is called by your
        //mouse down event handler.
        e.Handled = true;
    }
}

我已经对此进行了测试，无论如何它都有效我点击了多少次

You could suppress the double click event of TreeViewItem like so:

xaml:

<TreeView DockPanel.Dock="Left" TreeViewItem.PreviewMouseDoubleClick="TreeViewItem_PreviewMouseDoubleClick">
    <TreeViewItem Header="Node Level 1" IsExpanded="True" >
        <TreeViewItem Header="Node Level 2.1" >
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
        <TreeViewItem Header="Node Level 2.2">
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
    </TreeViewItem>
</TreeView>

code:

private void TreeViewItem_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    //this will suppress the event that is causing the nodes to expand/contract 
    e.Handled = true;
}

UPDATE

According to msdn docs:

Although this routed event seems to
follow a tunneling route through an
element tree, it actually is a direct
routed event that is raised along the
element tree by each UIElement...
Control authors who want to handle
mouse double clicks should use the
PreviewMouseLeftButtonDown event when
ClickCount is equal to two. This will
cause the state of Handled to
propagate appropriately in the case
where another element in the element
tree handles the event.

I'm not sure if this why you are having issues or not, but we'll do it the MSDN way and use PreviewMouseLeftButtonDown instead:

xaml:

<TreeView DockPanel.Dock="Left" TreeViewItem.PreviewMouseLeftButtonDown="TreeView_PreviewMouseLeftButtonDown">
    <TreeViewItem Header="Node Level 1" IsExpanded="True">
        <TreeViewItem Header="Node Level 2.1" >
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
        <TreeViewItem Header="Node Level 2.2">
            <TreeViewItem Header="MyItem" />
        </TreeViewItem>
    </TreeViewItem>
</TreeView>

code:

private void TreeView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount > 1)
    {
        //here you would probably want to include code that is called by your
        //mouse down event handler.
        e.Handled = true;
    }
}

I've tested this and it works no matter how many times i click

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