如何通过单击 wpf 中的按钮使用 TabIndex 导航光标？

Question

<Grid x:Name="LayoutRoot">
    <Button x:Name="BtnNavigateTabIndex" Content="NavigateTabIndex" Margin="152,200,0,190" HorizontalAlignment="Left" Width="120"/>
    <TextBox x:Name="TextBox_1" HorizontalAlignment="Left" Height="48" Margin="120,64,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="80"/>
    <TextBox x:Name="TextBox_2" HorizontalAlignment="Left" Height="48" Margin="120,128,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="80"/>
    <PasswordBox x:Name="PasswordBox_1" HorizontalAlignment="Left" Height="48" Margin="224,64,0,0" VerticalAlignment="Top" Width="72"/>
    <PasswordBox x:Name="PasswordBox_2" HorizontalAlignment="Left" Height="48" Margin="224,128,0,0" VerticalAlignment="Top" Width="72"/>
</Grid>

设计将如下所示。

如果我单击按钮（NavigateTabIndex），光标应该导航到 TextBox 或 PasswordBox。 对于 EX：如果您单击键盘中的 Tab 键，光标将导航。这就是我需要的场景。

Answer 1

一般来说，专注于 WPF 有很多陷阱......甚至有些错误。

您需要了解逻辑和键盘焦点之间的区别。

• http://msdn.microsoft.com/en-us/library/aa969768.aspx

使用 FocusScopes 时，您可以使用：

MoveFocus 和 TraversalRequest(FocusNavigationDirection.Next)

将逻辑焦点更改为范围内的下一项。

使用 FocusScopes 的替代方法是跟踪 GotFocus/LostFocus 事件并自行管理。

更多链接：

• How to programmatically navigate WPF UI element tab stops?

• Move focus in response to keyboard events in XAML

• WPF FocusNavigationDirection, MoveFocus and Arrow keys

• Locating the first WPF tab stop

• http://www.codeproject.com/Articles/38507/Using-the-WPF-FocusScope

---

好的，这里有一些示例代码。我冒昧地重新设计了您对 Grid 的使用，以遵循更传统的布局实践。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication5
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void BtnNavigateTabIndex_Click(object sender, RoutedEventArgs e)
        {
            UIElement focussedelement = FocusManager.GetFocusedElement(grid1) as UIElement;

            bool bmovedfocus = focussedelement.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));

            if (bmovedfocus)
            {
                UIElement withfocusnow = FocusManager.GetFocusedElement(grid1) as UIElement;

                if (withfocusnow == focussedelement) // focus didn't change! because end of focus group..need to put it back to the start
                {
                    TextBox_1.Focus();
                }
            }
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            TextBox_1.Focus();
        }
    }
}


    <Window x:Class="WpfApplication5.MainWindow"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:local="clr-namespace:WpfApplication5"
            Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded">
        <StackPanel>
            <Grid x:Name="grid1" FocusManager.IsFocusScope="True">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>
                <TextBox Margin="10" Grid.Row="0" Grid.Column="0" x:Name="TextBox_1" HorizontalAlignment="Left" Height="48" TextWrapping="Wrap" VerticalAlignment="Top" Width="80"/>
                <PasswordBox Margin="10" Grid.Row="0" Grid.Column="1" x:Name="PasswordBox_1" HorizontalAlignment="Left" Height="48" VerticalAlignment="Top" Width="72"/>
                <TextBox Margin="10" Grid.Row="1" Grid.Column="0" x:Name="TextBox_2" HorizontalAlignment="Left" Height="48" TextWrapping="Wrap" VerticalAlignment="Top" Width="80"/>
                <PasswordBox Margin="10" Grid.Row="1" Grid.Column="1" x:Name="PasswordBox_2" HorizontalAlignment="Left" Height="48" VerticalAlignment="Top" Width="72"/>
                <Button FocusManager.IsFocusScope="True" Padding="20" HorizontalAlignment="Center" Grid.Row="2" Grid.ColumnSpan="2" x:Name="BtnNavigateTabIndex" Content="NavigateTabIndex"  Width="120" Click="BtnNavigateTabIndex_Click" />
            </Grid>
        </StackPanel>
    </Window>

Answer 2

这行代码应该会让你朝着正确的方向前进：

element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));

其中 element 是 UIElement（就像您的文本框之一）。这是以下帖子的摘录：Moving to next control on Enter keypress in WPF。而你把这段代码放在按钮的点击事件处理程序上......

顺便说一句：发现活动的 UIElement / 用户控件是什么，可以按照here 的描述来完成。