WPF：自定义控制焦点管理

Question

我试图将焦点放在用于构建自定义 "Numeric Up Down" 控件的 TextBox 上。这是习俗"Numeric Up Down"

<Style x:Key="SpinButton" TargetType="Slider" >
    <Setter Property="Template">
    <Setter.Value>
    <ControlTemplate TargetType="Slider">
    <Border Grid.RowSpan="3" BorderThickness="1,1,1,1" BorderBrush="WhiteSmoke">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width=".5*"/>
            <ColumnDefinition Width=".5*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height=".5*"/>
            <RowDefinition Height=".5*"/>
        </Grid.RowDefinitions>
        <TextBox Name="textBoxNumericUpDown" Grid.RowSpan="3" Margin="2,0,0,0"         Text="{Binding Value,Mode=TwoWay, RelativeSource={RelativeSource     TemplatedParent}}" FontSize="20" VerticalAlignment="Center" Background="    {x:Null}" Foreground="White" BorderThickness="0" CaretBrush="White"     IsTabStop="True"/>
        <RepeatButton Grid.Column="1" Grid.Row="0" Margin="0,0,-5,0"     Command="Slider.IncreaseLarge" Style="{StaticResource TimeRepeatButtonStyle}" Content="+" Background="{x:Null}" BorderBrush="White" Foreground="White"     FontSize="18" Cursor="Hand" Width="44" Height="44" IsTabStop="False"/>
        <RepeatButton Grid.Column="1" Grid.Row="1" Command="Slider.DecreaseLarge"     Margin="0,1,-5,0" Style="{StaticResource TimeRepeatButtonStyle}" Content="-"     Background="{x:Null}" BorderBrush="White" Foreground="White" FontSize="18"     Cursor="Hand" Width="44" Height="44" IsTabStop="False"/>
    </Grid>
    </Border>
    </ControlTemplate>
    </Setter.Value>
    </Setter>
</Style>

用法

<Slider PreviewTextInput="textBoxTimeMinute_PreviewTextInput" Name="textBoxTimeMinute" Width="100" Style="{StaticResource SpinButton}" Maximum="999" Margin="8" HorizontalAlignment="Left" Minimum="0" IsTabStop="True" TabIndex="0"/>
<Label Grid.Column="1" Content=":" VerticalAlignment="Center" IsTabStop="False"/>
<Slider PreviewTextInput="textBoxTimeSecond_PreviewTextInput" Grid.Column="2" Name="textBoxTimeSecond" Width="100" Style="{StaticResource SpinButton}" Maximum="60" Margin="8" HorizontalAlignment="Left" Minimum="-1" IsTabStop="True" TabIndex="1"/>

Wanted result (Automatic focus on the first textbox if no number inside)

Wanted result (Automatic focus on the first textbox if number inside, number is selected)

我尝试了不同的方法使它 select 成为正确的控件，但它总是 select 在外层。在我的例子中 Grid/Border。只有在我按下 TAB 后，我才能得到它 select 正确的 TextBox 控件。

在WPF中有什么方法可以不按TAB键实现文本框的焦点吗？

Answer 1

已解决：

如果您想将 TextBox 聚焦在 ControlTemplate 中，您必须在“IsFocused”属性上设置触发器。当它变为真时，您必须将 FocusManager.FocusedElement 字段设置为您想要聚焦的文本框（或其他控件）的名称。

下面是我用来实现这个的代码：

<ControlTemplate TargetType="Slider">
 <TextBox x:Name="TextBoxToFocus"/> //The textbox(or any other element) I want to set focus to. It is very important to have it named, otherwise I won't know which control to focus.
 <ControlTemplate.Triggers> //The trigger
      <Trigger Property = "IsFocused" Value = "True" /> //The property the trigger is watching
           <Setter TargetName="TextBoxToFocus" Property="FocusManager.FocusedElement" Value="{Binding ElementName=NumericUpDown}"/> //Setter when the trigger executes
      </Trigger>
 </ControlTelmplate.Triggers>

WPF：自定义控制焦点管理

WPF: Customized control focus management

focus

wpf-controls