WPF中Popup上的textbox无法切换来汉语输入法

by admin on 2019年5月7日

As Marco Zhou has said in the msdn forum
(http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b2428b85-adc9-4a1e-a588-8dbb3b9aac06/):
Windows will only send WM_IME_SETCONTEXT message to the active window,
Popup by default is designed to be shown with WM_EX_NOACTIVE which
means that it doesn’t in active state when displaying, that’s why IME
could not work correctly in this regard, to workaround this issue, you
could try set the Popup as the active window using win32
SetActiveWindow() API.

So the workaround is use MyPopup instead of Popup:

public class MyPopup : Popup
{
    [DllImport(“user32.dll”)]
    static extern IntPtr SetActiveWindow(IntPtr hWnd);

    static MyPopup()
    {
        EventManager.RegisterClassHandler(
            typeof(MyPopup),
            Popup.PreviewGotKeyboardFocusEvent,
            new
KeyboardFocusChangedEventHandler(OnPreviewGotKeyboardFocus),
            true);
    }

    private static void OnPreviewGotKeyboardFocus(Object sender,
KeyboardFocusChangedEventArgs e)
    {
        var textBox = e.NewFocus as TextBoxBase;
        if (textBox != null)
        {
            var hwndSource = PresentationSource.FromVisual(textBox) as
HwndSource;
            if (hwndSource != null)
            {
                SetActiveWindow(hwndSource.Handle);
            }
        }
    }
}

官方化解方案

运用的话自身建1个类代码如上,控件内local:MyPopup
等同于Popup,亲测好使,实用。

参考:https://connect.microsoft.com/VisualStudio/feedback/details/389998/wpf-popup-messes-with-ime-switching

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