无法使 WPF 从 UserControl 的子控件传递焦点答案

【问题标题】：Can't make WPF pass focus from a child control of UserControl无法使 WPF 从 UserControl 的子控件传递焦点
【发布时间】：2011-12-10 16:50:20
【问题描述】：

我定义了一个名为TouchTextBox 的UserControl。当TextBox 获得焦点时，我已经获得了TouchTextBox 的焦点。现在我需要TouchTextBox 在用户单击另一个控件或按下选项卡时放弃焦点。这是TouchTextBox 的一些 XAML。

<UserControl x:Class="CarSystem.CustomControls.TouchTextBox"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:fps="clr-namespace:FPS.VirtualKeyboard;assembly=FPS.VirtualKeyboard"
             mc:Ignorable="d"
             Focusable="True"
             GotFocus="UserControl_GotFocus">

    <Grid Margin="0">
        <Border BorderBrush="{Binding Path=BorderBrush, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                BorderThickness="{Binding Path=BorderThickness, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"
                FocusManager.IsFocusScope="True"
                VerticalAlignment="{Binding Path=VerticalAlignment, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}">
            <TextBox AcceptsTab="False"
                     AcceptsReturn="False"
                     Background="White" 
                     Cursor="{Binding Path=Cursor, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FlowDirection="{Binding Path=FlowDirection, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontFamily="{Binding Path=FontFamily, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"
                     FontSize="{Binding Path=FontSize, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontStretch="{Binding Path=FontStretch, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontStyle="{Binding Path=FontStyle, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     FontWeight="{Binding Path=FontWeight, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     GotFocus="TextBox_GotFocus" 
                     HorizontalAlignment="{Binding Path=HorizontalAlignment, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     HorizontalContentAlignment="{Binding Path=HorizontalContentAlignment, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     IsEnabled="{Binding Path=IsEnabled, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     LostFocus="TextBox_LostFocus" 
                     Margin="1" 
                     MaxLength="{Binding Path=MaxLength, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     MaxLines="{Binding Path=MaxLines, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
                     Name="TextBox" 
                     Text="{Binding Path=Text, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}"
                     TextChanged="TextBox_TextChanged" />
        </Border>
        <Popup IsOpen="{Binding Path=PopupIsOpen, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}" 
               Name="KeyboardPopup" 
               PlacementTarget="{Binding Path=PlacementTarget, Mode=TwoWay, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}">
            <fps:VirtualKeyboard AutoFill="True" Name="PopupKeyboard" />
        </Popup>
    </Grid>
</UserControl>

此控件用作几个UserControl 的子控件，然后在我的MainWindow 中使用。当此控件获得焦点时，它会按设计显示 Popup。但不知何故，当我单击另一个控件或按 Tab 键时，它并没有放弃焦点。

我必须改变什么才能使这项工作有效？

托尼

【问题讨论】：

请向我们展示事件处理程序（LostFocus、GotFoucs）中的代码。
这能回答你的问题吗？ Setting tab order in wpf when use from UserControls?
这是stackoverflow.com/questions/7954973/… 的骗子……接受的答案只是重复了那里的答案。

标签： wpf user-controls focus focusmanager

【解决方案1】：

我通常使用的解决方法是在我的UserControl 上设置IsTabStop="False"（以防止在UserControl 本身上使用标签），然后在UserControl 内部使用TemplateBinding 绑定到内部控件TabIndex 到UserControl 的TabIndex。

看到这个问题：Setting tab order in wpf

【讨论】：