MonoGame.Samples/Graphics3DSample/Buttons/Clickable.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input.Touch;


namespace Graphics3DSample
{
    /// <summary>
    /// A game component.
    /// Has an associated rectangle.
    /// Accepts touch and click inside the rectangle.
    /// Has a state of IsTouching and IsClicked.
    /// </summary>
    public class Clickable : DrawableGameComponent
    {

        #region Fields
        readonly Rectangle rectangle;
        bool wasTouching;
        bool isTouching;

        #region Protected accessors
        public bool IsTouching { get { return isTouching; } }
        public bool IsClicked { get { return (wasTouching == true) && (isTouching == false); } }

        protected Rectangle Rectangle { get { return rectangle; } }
        protected new Graphics3DSampleGame Game { get { return (Graphics3DSampleGame)base.Game; } }
        #endregion
        #endregion

        #region Initialization
        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="game">The Game oject</param>
        /// <param name="targetRectangle">Position of the component on the screen</param>
        public Clickable(Graphics3DSampleGame game, Rectangle targetRectangle)
            : base(game)
        {
            rectangle = targetRectangle;
        }
        #endregion

        #region Input handling
        /// <summary>
        /// Handles Input
        /// </summary>
        protected void HandleInput()
        {
            wasTouching = isTouching;
            isTouching = false;

            TouchCollection touches = TouchPanel.GetState();

            if (touches.Count > 0)
            {
                var touch = touches[0];
                var position = touch.Position;


                Rectangle touchRect = new Rectangle((int)touch.Position.X - 5, (int)touch.Position.Y - 5,
                    10, 10);

                if (rectangle.Intersects(touchRect))
                    isTouching = true;
            }

        }
        #endregion
    }
}