recrownedgtk/RecrownedAthenaeum/UI/Modular/Modules/Interactive/Button.cs

using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using RecrownedAthenaeum.UI.Modular;
using RecrownedAthenaeum.DataTypes;
using RecrownedAthenaeum.Input;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using RecrownedAthenaeum.UI.Skin.Definitions;

namespace RecrownedAthenaeum.UI.Modular.Modules.Interactive
{
    public delegate bool Clicked();

    public class Button : UIModule
    {
        private ButtonSkinDefinition skinDefinition;
        private ISpecialDrawable downTexture, upTexture, highlightedTexture, disabledTexture;
        public event Clicked Listeners;
        private bool pressed;
        public bool disabled = false;
        public bool Highlighted { get; private set; }

        public Button(ISpecialDrawable down, ISpecialDrawable up, ISpecialDrawable disabled = null, ISpecialDrawable selected = null)
        {
            this.downTexture = down;
            this.upTexture = up;
            this.disabledTexture = disabled;
            this.highlightedTexture = selected;
        }

        public Button(Skin.Skin skin, string definitionName = null)
        {
            this.skinDefinition = skin.ObtainDefinition<ButtonSkinDefinition>(definitionName, GetType());
            downTexture = skin.textureAtlas[skinDefinition.downRegion];
            upTexture = skin.textureAtlas[skinDefinition.upRegion];
            disabledTexture = skin.textureAtlas[skinDefinition.disabledRegion];
            highlightedTexture = skin.textureAtlas[skinDefinition.selectedRegion];
        }

        public override void Draw(SpriteBatch batch)
        {
            if (disabled)
            {
                disabledTexture?.Draw(batch, bounds, color);
            }
            else
            {
                if (pressed)
                {
                    downTexture.Draw(batch, bounds, color);
                }
                else
                {
                    upTexture.Draw(batch, bounds, color);
                }
            }
            base.Draw(batch);
        }

        public sealed override bool MouseStateChanged(MouseState state)
        {
            if (InputUtilities.MouseWithinBoundries(bounds))
            {
                if (state.LeftButton == ButtonState.Pressed)
                {
                    pressed = true;
                }
                else
                {
                    pressed = false;
                }
                if (InputUtilities.MouseClicked())
                {
                    OnClick();
                }
                Highlighted = true;
            }
            else
            {
                Highlighted = false;
                pressed = false;
            }

            return base.MouseStateChanged(state);
        }

        public sealed override bool KeyboardStateChanged(KeyboardState state)
        {
            return base.KeyboardStateChanged(state);
        }

        protected void OnClick()
        {
            Listeners?.Invoke();
        }

    }
}