linear-app-launcher/RyzStudio/Windows/ThemedForms/TDialogForm.cs

namespace RyzStudio.Windows.ThemedForms
{
    using System;
    using System.ComponentModel;
    using System.Drawing;
    using System.Drawing.Design;
    using System.Windows.Forms;
    using Resources = AppLauncher.Properties.Resources;

    public partial class TDialogForm : System.Windows.Forms.Form
    {
        protected readonly Color borderColour = Color.FromArgb(232, 231, 236);
        protected readonly int borderWidth = 1;
        protected readonly Color titleBarColour = Color.FromArgb(152, 175, 206);
        protected readonly Color titleBarForeColour = Color.White;
        protected readonly Font titleBarFont = new Font("Segoe UI", 8.25F, FontStyle.Bold, GraphicsUnit.Point, 0);
        protected readonly int titleBarHeight = 32;

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

        protected bool isBusy = false;

        public TDialogForm() : base()
        {
            this.InitializeComponent();

            this.FormBorderStyle = FormBorderStyle.None;
            this.ShowInTaskbar = false;

            imgbxClose.Click += pictureBox3_Click;
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            base.OnClosing(e);

            if (this.IsBusy)
            {
                e.Cancel = true;
            }
        }

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

            if (e.Button == MouseButtons.Left)
            {
                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 = new Point(x, y);
            }
        }

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

            isDragging = false;
        }

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

            Graphics g = e.Graphics;
            Rectangle area = new Rectangle(this.DisplayRectangle.X, this.DisplayRectangle.Y, (this.DisplayRectangle.Width - borderWidth), (this.DisplayRectangle.Height - borderWidth));

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

            area.Inflate((-1 * borderWidth), (-1 * borderWidth));

            g.FillRectangle(new SolidBrush(titleBarColour), area.X, area.Y, (area.Width + area.X), titleBarHeight);

            TextRenderer.DrawText(g, this.Title, titleBarFont, new Point(12, 11), titleBarForeColour);

        }

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

            this.Invalidate();
        }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public override Color BackColor { get => base.BackColor; set => base.BackColor = Color.FromArgb(254, 254, 254); }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new FormBorderStyle FormBorderStyle { get => base.FormBorderStyle; set => base.FormBorderStyle = value; }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new Padding Padding { get => base.Padding; set => base.Padding = value; }

        [Category("Appearance"), Browsable(true)]
        public string Title { get; set; }

        protected virtual bool IsBusy { get => isBusy; set => isBusy = value; }

        private void pictureBox3_Click(object sender, System.EventArgs e)
        {
            MouseEventArgs mouseEvent = (MouseEventArgs)e;
            if (mouseEvent != null)
            {
                if (mouseEvent.Button != MouseButtons.Left)
                {
                    return;
                }
            }

            this.Close();
        }


    }
}