Question

我有一个应用程序，必须在某些UIElements获得焦点（TextBox，PasswordBox等）时打开屏幕键盘。我在MainWindow上使用GotKeyboardFocus和LostKeyboardFocus来实现这个目标：

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

一切都很好，除非我打开一个包含自己的TextBoxes的新窗口。显然，由于它们不是MainWindows routedEvent的一部分，因此它们不会触发键盘焦点事件。有没有办法可以让所有子窗口从MainWindow继承GotKeyboardFocus或让它将键盘焦点事件传递回其父窗口？

Answer 1

我建议使用 EventManager 来注册所选事件的全局（应用程序范围）处理程序。这是一个例子：

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)
    {
       ...
    }
}

从子窗口到父窗口的GotKeyboardFocus事件

1 个答案: