转发KeyPress事件 [英] Forward a KeyPress-event

问题描述

我有一个TextBox，想从另一个Form转发一个KeyPress事件.

I have a TextBox and would like to forward a KeyPress-event from another Form.

到目前为止，我有我的表格:

So far I have my Form:

private readonly Action<KeyPressEventArgs> m_KeyPress;

public KeyboardForm( Action<KeyPressEventArgs> keyPress )
{
  m_KeyPress = keyPress;
}

protected override void OnKeyPress( KeyPressEventArgs e )
{
  m_KeyPress( e );
  base.OnKeyPress( e );
}

还有一个派生的TextBox，它初始化了Form:

And a derived TextBox, which initializes the Form:

var keyboardForm = new KeyboardForm( OnKeyPress );
keyboardForm.Show();

现在，将按预期方式(在Form中，然后在TextBox中)调用OnKeyPress方法.但是，什么都没有发生……当我按下"a"时，我希望在文本框中出现一个"a" ...

Now, the OnKeyPress-method gets called as expected (of the Form, then of the TextBox). But nevertheless nothing happens ... when I press 'a' I expected an 'a' to appear in my TextBox ...

有人知道这里有什么问题吗?

Does anyone have an idea what's the problem here?

它也不能与KeyDown一起使用，并且附加到常规的公开事件KeyPress也无济于事.我认为问题在于OnKeyPress的显式调用.可以吗?

It is not working with KeyDown, too, and attaching to the regular exposed event KeyPress does not help me either. I think, that the problem is the explicit call of OnKeyPress. Is it allowed?

推荐答案

Form1:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        Form2 f = new Form2();
        f.mEvent += new Form2.TestEvent(f_mEvent);
        f.Show();
    }

    void f_mEvent(KeyPressEventArgs e)
    {
        textBox1.Text += e.KeyChar;
    }
}

Form2:

public partial class Form2 : Form
{
    public delegate void TestEvent(KeyPressEventArgs e);
    public event TestEvent mEvent;

    public Form2()
    {
        InitializeComponent();
    }

    protected override void OnKeyPress(KeyPressEventArgs e)
    {
        if (mEvent != null)
        {
            mEvent(e);
        }
        base.OnKeyPress(e);
    }
}

这篇关于转发KeyPress事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！