input.cs

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

namespace SceneryComponent.Components
{
    public delegate void KeyboardEventDelegate(KeyboardEventArgs e);

    public class KeyboardEventArgs : EventArgs
    {
        public readonly Keys Key;

        public KeyboardEventArgs(Keys key)
            : base()
        {
            Key = key;
        }
    }

    public class Input : GameComponent
    {
        private bool m_Active = false;
        private Viewport m_Viewport;

        private List<Keys> m_PressedKeys = new List<Keys>();

        public event KeyboardEventDelegate KeyDown;
        public event KeyboardEventDelegate KeyUp;

        public bool Active
        {
            get
            {
                return m_Active;
            }
            set
            {
                if (m_Active != value)
                {
                    m_Active = value;

                    Mouse.SetPosition(CenterX, CenterY);
                }
            }
        }
        public int CenterX
        {
            get
            {
                return m_Viewport.Width / 2;
            }
        }
        public int CenterY
        {
            get
            {
                return m_Viewport.Height / 2;
            }
        }
        public int X
        {
            get
            {
                if (m_Active)
                {
                    return CenterX - Mouse.GetState().X;
                }

                return 0;
            }
        }
        public int Y
        {
            get
            {
                if (m_Active)
                {
                    return CenterY - Mouse.GetState().Y;
                }

                return 0;
            }
        }

        public Input(Game game, Viewport viewport):base(game)
        {
            m_Viewport = viewport;
        }

        public bool ReadKey(Keys key)
        {
            KeyboardState state = Keyboard.GetState();

            if (state.IsKeyDown(key))
            {
                if (!m_PressedKeys.Contains(key))
                {
                    m_PressedKeys.Add(key);

                    if (KeyDown != null)
                    {
                        KeyDown(new KeyboardEventArgs(key));
                    }
                }

                return true;
            }
            else
            {
                if (m_PressedKeys.Contains(key))
                {
                    m_PressedKeys.Remove(key);

                    if (KeyUp != null)
                    {
                        KeyUp(new KeyboardEventArgs(key));
                    }
                }

                return false;
            }
        }

        public override void Update(GameTime gameTime)
        {
            base.Update(gameTime);

            if (m_Active)
            {
                Mouse.SetPosition(CenterX, CenterY);
            }
        }
    }
}