为什么触发`IsKeyboardFocusWithin`在值为false时不起作用？

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变为en-us，但不会将其返回fa-ir，这有什么问题？

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>