如何使文本框的行为类似于C＃中的弹出信息框

Question

i intend to display some information when i right click on a textbox. this information is just plain readable information.

My approach was to use a richtextbox to be visible whenever the texbox is right clicked. however i am not able to hide the textbox when user clicks the container. using mousecapturechanged event for Richtextbox only caputres the click on the Richtextbox and not any clicks made outside the Richtextbox. release focus also does not solve the purpose.

Edit: Gist:

So what am i trying to do is create a popup info box, whose sole purpose should be to display information and then hide when click is made anywhere other than the box itself

Answer 1

我知道您说过明确释放焦点是行不通的（确切地说，您是怎么做的？），即使在富文本框中为LostFocus设置了事件侦听器，然后在出现偶数时将其隐藏，该怎么办？

Answer 2

This works for me : this assumes you do want the RTF control to pop up where the user clicked in the TextBox, rather than in a fixed location. And this example suppresses the default context menu by setting ShortCutsEnabled : it re-enables using keyboard shortcuts when the left mouse goes down : if they are turned off. This example also defines a double-click handler on the RTF control which will also hide the RTF control.

    private Point rtfLocation;

    private void textBox1_MouseDown(object sender, MouseEventArgs e)
    {
        if (MouseButtons == MouseButtons.Right)
        {
            rtfLocation = this.PointToClient(textBox1.PointToScreen(new Point(e.X, e.Y)));
            textBox1.ShortcutsEnabled = false;
            richTextBox1.Location = rtfLocation;
            richTextBox1.Show();
        }
    }

    private void richTextBox1_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        richTextBox1.Hide();
    }

    private void richTextBox1_Leave(object sender, EventArgs e)
    {
        richTextBox1.Hide();
    }

    private void Form1_Click(object sender, EventArgs e)
    {
        if (richTextBox1.Visible)
        {
            richTextBox1.Hide();
        }
    }

    private void textBox1_Click(object sender, EventArgs e)
    {
        if (richTextBox1.Visible) richTextBox1.Hide();
    }

    private void richTextBox1_VisibleChanged(object sender, EventArgs e)
    {
        textBox1.ShortcutsEnabled = ! richTextBox1.Visible;
    }

Answer 3

In winforms Controls the LostFocus Events doesn't work in all situations.. better use the Leave event.. it always fires when the control Loses the Focus.. In your case you need to track the MouseDown( or whatever event of the mouse you like the best) in the TextBox to pop out the RichtextBox and then use the Leave event of the RichtextBox to Hide it. Do not try to Remove the RichtextBox Control in the leave event.. it might crash.