如何同时显示和隐藏具有相同键的表单？

Question

I am making an RPG game with forms and I can't figure out how to show and hide a particular form with only one key. For example when I press the "C" key I want it to show me the form with the PlayerInfo panel, and when I press "C" again I want it to hide it.

private void KeyPress(object sender, KeyEventArgs e)
    {
        PlayerInfo playerInfo = new PlayerInfo(this);
        bool visible = false;

        if (e.KeyCode == Keys.C)
        {
            if (visible == false)
            {
                playerInfo.Show();
                visible = true;
            } 
        }

        if (e.KeyCode == Keys.C)
        {
            if (visible)
            {
                playerInfo.Hide();
                visible = false;
            }
        }
    }

Answer 1

You need an if/else statement, right now both if's are getting called so you end up showing and then hiding it in the same call when you hit the key

bool visible = false;

private void KeyPress(object sender, KeyEventArgs e)
{
    PlayerInfo playerInfo = new PlayerInfo(this);


    if (e.KeyCode == Keys.C)
    {
        if (visible == false)
        {
            playerInfo.Show();
            visible = true;
        } 
        else if (visible)
        {
            playerInfo.Hide();
            visible = false;
        }
    }
}

EDIT: Sorry, I didn't notice that your visible variable was a local variable. You need to make this a class variable, and set it on construction of your object. If you initialize it in your callback you'll always be setting it to false.

Answer 2

I would add a method and a property in PlayerInfo class, called toggle

 public class PlayerInfo { 
       // your stuff
       public bool IsVisible {get;set;}
       public void Toggle() {
             if (IsVisible)
                   Hide()
             else
                   Show()
             IsVisible = !IsVisible
       }
 }

Answer 3

Using your code you will always get it's visibility true until u make visible as global variable. Probably playerInfo too be global, else it will be a new instance every time.

Global declaration:

bool visible = false;
PlayerInfo playerInfo = new PlayerInfo(this);

KeyPress Method signature:

private void KeyPress(object sender, KeyEventArgs e)
{
 if (e.KeyCode == Keys.C)
    {
        if (!visible)
        {
            playerInfo.Show();
            visible = true;
        } 
        else
        {
            playerInfo.Hide();
            visible = false;
        }
    }
}