wpf - 为什么当值为 false 时 `IsKeyboardFocusWithin` 上的触发器不起作用？

Question

我想更改 Textbox.GotFocus 和 Textbox.LostFocus 上的 InputLanguage，所以我这样做:

<Style TargetType="{x:Type TextBox}" x:Key="EnglishTextStyle">
    <Style.Triggers>
        <Trigger Property="IsKeyboardFocusWithin" Value="True">
            <Setter Property="InputLanguageManager.InputLanguage" Value="en-us" />
        </Trigger>
        <Trigger Property="IsKeyboardFocusWithin" Value="False">
            <Setter Property="InputLanguageManager.InputLanguage" Value="fa-ir" />
        </Trigger>
    </Style.Triggers>
</Style>

它将 InputLanguage 更改为 en-us 但没有将其返回到 fa-ir，这是什么问题？

Answer 1

您还需要指定类型:

<Trigger Property="TextBox.IsKeyboardFocusWithin" Value="False">
     <Setter Property="TextBox.InputLanguageManager.InputLanguage" Value="fa-ir" />
</Trigger>