linear-app-launcher/Windows/Forms/AForm.cs

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace AppLauncher.Windows.Forms
{
    public class AForm : Form
    {
        protected readonly int titleHeight = 56;

        protected bool isDragging = false;
        protected Point startPosition = new Point();

        public AForm() : base()
        {
            if (!this.DesignMode)
            {
                this.FormBorderStyle = FormBorderStyle.None;
                this.StartPosition = FormStartPosition.Manual;
            }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            Graphics g = e.Graphics;

            Color borderColour = Color.FromArgb(232, 231, 236);
            Color menubarColour = Color.FromArgb(237, 240, 247);
            Rectangle area = new Rectangle(this.DisplayRectangle.X, this.DisplayRectangle.Y, (this.DisplayRectangle.Width - 1), (this.DisplayRectangle.Height - 1));

            // border
            g.DrawRectangle(new Pen(borderColour, 1), area);

            area.Inflate(-1, -1);

            g.FillRectangle(new SolidBrush(menubarColour), area.X, area.Y, (area.Width + area.X), titleHeight);
            g.DrawLine(new Pen(borderColour, 1), area.X, (titleHeight + 1), (area.Width + area.X), (titleHeight + 1));

            g.DrawImageUnscaled(Properties.Resources.app_icon_24, 17, 17);

            TextRenderer.DrawText(e.Graphics, "Launcher", new Font(this.Font.FontFamily, 14F), new Point(58, 17), Color.FromArgb(156, 158, 171));

        }

        protected override void OnMouseClick(MouseEventArgs e)
        {
            base.OnMouseClick(e);

            bool isLabel = ((e.Location.X >= 0) && (e.Location.X <= this.Width) && (e.Location.Y >= 0) && (e.Location.Y <= titleHeight));

            if (e.Button == MouseButtons.Left)
            {
                if (isLabel)
                {
                    // do nothing
                }
                else
                {
                    // do nothing
                }
            }
            else if (e.Button == MouseButtons.Right)
            {
                if (isLabel)
                {
                    if (this.TitleContextMenuStrip != null)
                    {
                        this.TitleContextMenuStrip.Show(this, e.Location);
                    }
                }
                else
                {
                    // do nothing
                }
            }
        }

        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);

            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            isDragging = true;
            startPosition = e.Location;
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);

            if (isDragging)
            {
                int x = (this.Location.X + (e.Location.X - startPosition.X));
                int y = (this.Location.Y + (e.Location.Y - startPosition.Y));

                //this.Location = validateFormLocation(x, y);
                this.Location = new Point(x, y);
            }
        }

        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);

            isDragging = false;
        }

        protected Point DefaultLocation
        {
            get
            {
                Point newPosition = new Point(Cursor.Position.X, Cursor.Position.Y);
                newPosition.X -= (this.Width / 2);
                newPosition.Y -= (this.Height / 2);

                newPosition.X = Math.Max(newPosition.X, Screen.PrimaryScreen.WorkingArea.Left);
                newPosition.Y = Math.Max(newPosition.Y, Screen.PrimaryScreen.WorkingArea.Top);

                return newPosition;
            }
        }

        public override Color BackColor { get => base.BackColor; set => base.BackColor = Color.FromArgb(254, 254, 254); }

        [Category("Appearance")]
        public ContextMenuStrip TitleContextMenuStrip { get; set; } = null;

    }
}