Component.cs

public abstract class Component
    //abstract to it has to be inherited and any child will be
    //forced to use the Draw & Update class
    {
        public abstract void Draw(GameTime gameTime, SpriteBatch spriteBatch);

        public abstract void Update(GameTime gameTime);
    }

Button.cs

public abstract class Button : Component
    //abstract to it has to be inherited and any child will be
    //forced to use the Draw & Update class
    {
       // #region Fields

        private MouseState _currentMouse;
        private SpriteFont _font;

        private MouseState _previousMouse;
        private Texture2D _texture;
        // #endregion

        public event EventHandler Click;
        public Color TextColour { get; set; }
        public Vector2 Position { get; set; }
        public Rectangle Rectangle
        {
            get
            {
                return new Rectangle((int)Position.X, (int)Position.Y, _texture.Width, _texture.Height);
            }
        }
        public string Text { get; set; }


        public Button(Texture2D texture, SpriteFont font)
        {
            _texture = texture;

            _font = font;

            TextColour = Color.White;
        }

        public override void Draw(GameTime gameTime, SpriteBatch spriteBatch)
        {
            var colour = Color.White;

            spriteBatch.Draw(_texture, Rectangle, colour);

            if (!string.IsNullOrEmpty(Text))
            {
                var x = (Rectangle.X   (Rectangle.Width / 2)) - (_font.MeasureString(Text).X / 2);
                var y = (Rectangle.Y   (Rectangle.Height / 2)) - (_font.MeasureString(Text).Y / 2);
                //center the font within the button

                spriteBatch.DrawString(_font, Text, new Vector2(x, y), TextColour);
            }
        }

        public override void Update(GameTime gameTime)
        {
            _previousMouse = _currentMouse;
            _currentMouse = Mouse.GetState();
            //sets position of the mouse to actual current position
            

            if (_currentMouse.LeftButton == ButtonState.Released & _previousMouse.LeftButton == ButtonState.Pressed)
            {
                Click?.Invoke(this, new EventArgs());
                //if click event handler is != null ....use it   
            }

        }
    }

I have these classes set up to register a button press on my game.

Within game1.cs I tried to add the following to load content.

 _spriteBatch = new SpriteBatch(GraphicsDevice);

var randomButton = new Button(Content.Load<Texture2D>("Controls/Button"), Content.Load<SpriteFont>("Fonts/Font"))
{
               
};

When implementing this I get error code CS0144 "Cannot create an instance or abstract type or interface 'Button'"

at the top of game1 I am using namespace.Controls as Button.cs is located in a folder called Controls. Any assistance or advice on this would be welcomed.

CodePudding user response：

Why is Button abstract?, abstract types cannot be initialized with the new keyword, instead their constructors are considered abstract and a derived type should call base() to it, consider not abstracting the class Button if possible (possible means: if you have any abstract member, than it is not possible, else, yes it is).