XNA Editable text field

问题

I know how to draw text in XNA but I am implementing a level designer that will require the user to enter text into a UI. I have had a little scoot around on Google but couldn't find how to implement an editable text field. Is there nothing built into the framework for this?

回答1:

you can use some sort of gui library like http://nuclexframework.codeplex.com

or use winforms http://create.msdn.com/en-US/education/catalog/sample/winforms_series_1

回答2:

Have you considered implementing a level editor for your game by embedding XNA in WinForms?

回答3:

If just need a simple way to enter a small amount of text create a class kbHandler

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework.Input;

namespace CodeName
{
public class KbHandler
{
    private Keys[] lastPressedKeys;
    public string tekst = "";

    public KbHandler()
    {
        lastPressedKeys = new Keys[0];
    }

    public void Update()
    {
        KeyboardState kbState = Keyboard.GetState();
        Keys[] pressedKeys = kbState.GetPressedKeys();

        //check if any of the previous update's keys are no longer pressed
        foreach (Keys key in lastPressedKeys)
        {
            if (!pressedKeys.Contains(key))
                OnKeyUp(key);
        }

        //check if the currently pressed keys were already pressed
        foreach (Keys key in pressedKeys)
        {
            if (!lastPressedKeys.Contains(key))
                OnKeyDown(key);
        }

        //save the currently pressed keys so we can compare on the next update
        lastPressedKeys = pressedKeys;
    }

//Create your own   
private void OnKeyDown(Keys key)
    {
        switch (key)
        {
            case Keys.D0:
                tekst += "0";
                break;
            case Keys.D1:
                tekst += "1";
                break;
            case Keys.D2:
                tekst += "2";
                break;
            case Keys.D3:
                tekst += "3";
                break;
            case Keys.D4:
                tekst += "4";
                break;
            case Keys.D5:
                tekst += "5";
                break;
            case Keys.D6:
                tekst += "6";
                break;
            case Keys.D7:
                tekst += "7";
                break;
            case Keys.D8:
                tekst += "8";
                break;
            case Keys.D9:
                tekst += "9";
                break;
            case Keys.NumPad0:
                tekst += "0";
                break;
            case Keys.NumPad1:
                tekst += "1";
                break;
            case Keys.NumPad2:
                tekst += "2";
                break;
            case Keys.NumPad3:
                tekst += "3";
                break;
            case Keys.NumPad4:
                tekst += "4";
                break;
            case Keys.NumPad5:
                tekst += "5";
                break;
            case Keys.NumPad6:
                tekst += "6";
                break;
            case Keys.NumPad7:
                tekst += "7";
                break;
            case Keys.NumPad8:
                tekst += "8";
                break;
            case Keys.NumPad9:
                tekst += "9";
                break;
            case Keys.OemPeriod:
                tekst += ".";
                break;
            case Keys.Back:
                if (tekst.Length > 0)
                {
                    tekst = tekst.Remove(tekst.Length - 1, 1);
                }                    
                break;

        }

    }

    private void OnKeyUp(Keys key)
    {
        //do stuff
    }
}
}

And in the update loop

kb.Update();
string text = kb.tekst;

This is a really easy and dirty way to do it

回答4:

You will have to create your own area that the user can click into. When they do you need to capture the key presses.

回答5:

To go along with some of the other suggestions on this thread, you could also use WPF and just render the XNA to a custom user control in xaml. There's a great blog post by Nick Gravelyn on how to do this here:
http://blogs.msdn.com/b/nicgrave/archive/2010/07/25/rendering-with-xna-framework-4-0-inside-of-a-wpf-application.aspx

The great part about this is that you can use techniques like MVVM then to write your editor :-)

来源：https://stackoverflow.com/questions/4462088/xna-editable-text-field