Question

更新：Discusion显示只有在wpf应用程序中托管自定义控件文本框时才会出现问题，该应用程序再次通过winforms应用程序中的elementhost托管。

我有一个从TextBox开始的WPF-CustomControl。我重写了OnLostKeyBoardFocus方法。

作为这种方法的一部分，我举起了一个活动。一个事件处理程序显示一个MessageBox（这不在我的控制之下）。当用户关闭MessageBox时，KeyBoardFocus将直接返回到TextBox。尽管如此，OnLostKeyboardFocus（...）仍然没有返回。

自动（重新）聚焦我的TextBox控件，给我带来了一系列问题。除了使用Dispatcher.BeginInvoke（）调度事件之外，我是否可以通过某种方式规避此行为。

class MyTextBoxCustomControl : TextBox {

    public event EventHandler<EditCompletedEventArgs> EditCompleted;

    private void OnEditCompleted(EditCompletedEventArgs e)
    {
        var handler = EditCompleted;
        if (handler != null) handler(this, e);
    }

    protected override OnLostKeyboardFocus(KeyboardFocusChangedEventArgs e){

        base.OnLostKeyboardFocus(e);  

        OnEditCompleted(new EditCompletedEventArgs())

        //Before this point is reached OnGotKeyboardFocus(...) is called
    }

    protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
    {
        base.OnGotKeyboardFocus(e);

        //Is called twice, directly after MessageBox is closed and
        //after OnLostKeyboardFocus(...) returns
    }
}

class MyEventHandler {

    private void Test(){

        var myTBCC = new MyTextBoxCustomControl();

        //Closing the message box will return focus to myTBCC, which directly 
        //causes OnGotKeyboardFocus to be called
        myTBCC.EditCompleted += (a, b) =>  
                                    MessageBox.Show("PressOk");                    
    }
}

Answer 1

您可以在MessageBox.Show。

之后立即尝试在发件人上发送.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));

修改

... MessageBox.Show("PressOk"); ((MyTextBoxCustomControl)a).MoveFocus(new TraversalRequest(FocusNavigationDirection.Next)); ...

WPF MessageBox将键盘焦点返回到错误的控件

1 个答案: