linear-app-launcher/RyzStudio/Windows/Forms/FlatButton.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RyzStudio.Windows.Forms
{
    public class FlatButton : Label
    {
        public class Style
        {
            public Color BackColour { get; set; } = Color.Transparent;
            public Color PenColour { get; set; } = Color.Transparent;
        }

        public enum State
        {
            Idle = 0,
            Hover,
            Down
        }

        protected State controlState = State.Idle;

        public FlatButton() : base()
        {
            this.AutoSize = false;
            this.ImageAlign = ContentAlignment.MiddleCenter;
            this.TextAlign = ContentAlignment.MiddleCenter;

            // customise
            this.StyleOver = new Style()
            {
                BackColour = Color.FromArgb(51, 51, 51),
                PenColour = Color.White
            };
            this.StyleDown = new Style()
            {
                BackColour = Color.FromArgb(179, 179, 179),
                PenColour = Color.Black
            };
            this.StyleDefault = new Style()
            {
                BackColour = Color.White,
                PenColour = Color.Black
            };

            this.VisualState = State.Idle;

            this.Click += delegate { this.OnClick(null); };
            this.MouseEnter += delegate { this.VisualState = State.Hover; };
            this.MouseLeave += delegate { this.VisualState = State.Idle; };
            this.MouseDown += delegate { this.VisualState = State.Down; };
            this.MouseUp += delegate { this.VisualState = State.Idle; };
        }

        protected State VisualState
        {
            get { return controlState; }
            set
            {
                switch (value)
                {
                    case State.Idle:
                        if (this.VisualState == State.Down)
                        {
                            updateButton(StyleOver);
                        }
                        else
                        {
                            updateButton(StyleDefault);
                        }

                        break;
                    case State.Hover:
                        updateButton(StyleOver);
                        break;
                    case State.Down:
                        updateButton(StyleDown);
                        break;
                    default:
                        updateButton(StyleDefault);
                        break;
                }

                controlState = value;
            }
        }

        protected void updateButton(Style style)
        {
            this.ForeColor = style.PenColour;
            this.BackColor = style.BackColour;
        }

        [Browsable(false)]
        public Style StyleOver { get; set; } = new Style();

        [Browsable(false)]
        public Style StyleDown { get; set; } = new Style();

        [Browsable(false)]
        public Style StyleDefault { get; set; } = new Style();

        public void PerformClick() => this.OnClick(null);

    }
}