c# – 如何防止我的WPF TreeView聚焦所选的TreeViewItem
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我正在使用TreeView,我有一些孩子.
问题是,当我选择宽度高于TreeView的子项时,滚动自动移动以显示所有选定的项目,我想禁用此行为！
我已经尝试过处理RequestBringIntoView事件,但它似乎没有用！
谢谢你的帮助！
这是XAML：
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="350">
<Grid>
<TreeView RequestBringIntoView="TreeView_RequestBringIntoView">
<TreeViewItem Header="Monster huge tree view item Header OMG WTF IS THAT BBQ"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="Monster huge tree view item Header OMG WTF IS THAT BBQ">
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1">
<TreeViewItem Header="Monster huge tree view item Header OMG WTF IS THAT BBQ"/>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
<TreeViewItem Header="TreeView Elem 1"/>
</TreeView>
</Grid>
</Window>
代码惊吓CS：
using System.Windows;
namespace WpfApplication2
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void TreeView_RequestBringIntoView(object sender, RequestBringIntoViewEventArgs e)
{
e.Handled = true;
}
}
}
解决方法:
您需要在TreeViewItem上处理RequestBringIntoView事件而不是TreeView.
您需要使用事件设置器为下面的数据绑定项执行此操作.
<TreeView>
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<EventSetter Event="RequestBringIntoView" Handler="Null_Handler"/>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
或者像下面的xaml定义的例子
<TreeView>
<TreeViewItem Header="Monster huge tree view item Header OMG WTF IS THAT BBQ" RequestBringIntoView="Null_Handler"/>
<TreeViewItem Header="TreeView Elem 1" RequestBringIntoView="Null_Handler">
</TreeView>
其中Null_Handler的定义如下
private void Null_Handler(object sender, RoutedEventArgs e)
{
e.Handled = true;
}
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