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

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AppLauncher.Windows.Forms
{
    public class AForm : Form
    {
        protected bool isDragging = false;
        protected Point startPosition = new Point();

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

            this.MouseDown += mainForm_MouseDown;
            this.MouseUp += mainForm_MouseUp;
            this.MouseMove += mainForm_MouseMove;
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            if (this.DesignMode)
            {
                return;
            }

            //int requestedHeight = (int)Math.Floor(decimal.Divide((Screen.PrimaryScreen.WorkingArea.Height - this.Height), 2));
            //this.Location = new Point(Screen.PrimaryScreen.WorkingArea.X, (Screen.PrimaryScreen.WorkingArea.Y + requestedHeight));

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

            //this.Location = newPosition;
        }

        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), 56);
            g.DrawLine(new Pen(borderColour, 1), area.X, 57, (area.Width + area.X), 57);

            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));

            //g.DrawRectangle(new Pen(Color.FromArgb(232, 231, 236), 1), borderArea);
            //g.DrawRectangle(new Pen(Color.Red, 1), area);

        }

        //protected override void OnPaintBackground(PaintEventArgs e)
        //{
        //    base.OnPaintBackground(e);

        //Graphics g = e.Graphics;
        //g.TextRenderingHint = TextRenderingHint.AntiAlias;
        //g.InterpolationMode = InterpolationMode.HighQualityBilinear;
        //g.PixelOffsetMode = PixelOffsetMode.HighQuality;
        //g.SmoothingMode = SmoothingMode.HighQuality;

        //g.FillRectangle(new LinearGradientBrush(this.DisplayRectangle, Color.FromArgb(76, 83, 93), Color.FromArgb(255, 255, 255), -30F), this.DisplayRectangle);

        //g.DrawRectangle(new Pen(new SolidBrush(Color.Red), 1), this.DisplayRectangle);
        //}

        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); }

        private void mainForm_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            isDragging = true;
            startPosition = e.Location;
        }

        private void mainForm_MouseUp(object sender, MouseEventArgs e)
        {
            isDragging = false;
        }

        private void mainForm_MouseMove(object sender, MouseEventArgs 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);
            }
        }

    }
}