从子窗口到父窗口的GotKeyboardFocus事件

本文关键字：窗口 GotKeyboardFocus 事件 | 更新日期: 2023-09-27 17:58:27

我有一个应用程序，每当某些UI元素（TextBox、PasswordBox等）获得焦点时，它必须打开屏幕键盘。我使用主窗口上的GotKeyboardFocus和LostKeyboard福克斯来实现这一点：

this.GotKeyboardFocus += AutoKeyboard.GotKeyboardFocus;
this.LostKeyboardFocus += AutoKeyboard.LostKeyboardFocus;

一切都很好，除了当我打开一个包含自己的TextBoxes的新窗口时。显然，由于它们不是MainWindows routedEvent的一部分，因此不会触发键盘焦点事件。有没有一种方法可以让所有子窗口从MainWindow继承GotKeyboardFocus，或者让它将键盘焦点事件传递回其父窗口？

从子窗口到父窗口的GotKeyboardFocus事件

我建议使用EventManager为所选事件注册全局（应用程序范围）处理程序。这里有一个例子：

public partial class App : Application
{
    public App()
    {
        EventManager.RegisterClassHandler(
            typeof (UIElement),             
            UIElement.GotKeyboardFocusEvent,
            new RoutedEventHandler(GotKeyboardFocusEventHandler));
        EventManager.RegisterClassHandler(
            typeof (UIElement), 
            UIElement.LostKeyboardFocusEvent,
            new RoutedEventHandler(LostKeyboardFocusEventHandler));
    }
    private void GotKeyboardFocusEventHandler(object sender, RoutedEventArgs routedEventArgs)
    {
       ...
    }
    private void LostKeyboardFocusEventHandler(object sender, RoutedEventArgs routedEventArgs)
    {
       ...
    }
}
相关文章：