WPF-嵌套控件按键事件顺序

最新推荐文章于 2024-11-12 22:08:44 发布

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最新推荐文章于 2024-11-12 22:08:44 发布 · 1.4k 阅读

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#wpf #控件

本文详细探讨了在WPF中，嵌套控件如Grid和TextBlock如何处理按键事件。当在Grid_PreviewKeyDown_1事件中设置e.Handled = true时，事件处理顺序发生变化，依次为Grid_PreviewKeyDown_1、Grid_PreviewKeyUp_1、TextBlock_PreviewKeyUp_1、TextBlock_KeyUp_1、Grid_KeyUp_1。这展示了WPF事件冒泡和隧道传递机制的影响。

<Window x:Class="EventOrderDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <DockPanel LastChildFill="True" PreviewKeyDown="Grid_PreviewKeyDown_1" PreviewKeyUp="Grid_PreviewKeyUp_1" KeyDown="Grid_KeyDown_1" KeyUp="Grid_KeyUp_1">
        <ListBox DockPanel.Dock="Right" Width="100">
            <ListBoxItem>
                <TextBox Margin="10,10,10,10">  
                </TextBox>
            </ListBoxItem>
            <ListBoxItem>
                <TextBox>
                </TextBox>
            </ListBoxItem>
        </ListBox>
        <TextBox  PreviewKeyDown="TextBlock_PreviewKeyDown_1" PreviewKeyUp="TextBlock_PreviewKeyUp_1" KeyDown="TextBlock_KeyDown_1" KeyUp="TextBlock_KeyUp_1" >

        </TextBox