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 bool isBusy = false;

        protected Color topFillColour = Color.FromArgb(15, 15, 15);
        protected int topFillHeight = 32;
        protected int borderWidth = 1;

        private bool windowDragging = false;
        private Point windowOffset = new Point();
        private Point windowSize = new Point();

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

            this.BackColor = Color.FromArgb(246, 246, 246);
            this.Padding = new Padding(1);

			this.topFillColour = Color.FromArgb(51, 51, 51);
			this.topFillHeight = 32;

			this.BackColor = Color.FromArgb(248, 249, 250);
            this.FormBorderStyle = FormBorderStyle.None;

            imgbxClose.Click += pictureBox3_Click;
        }

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

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

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

            Graphics g = e.Graphics;

            Rectangle areaTop = new Rectangle(this.DisplayRectangle.Left, this.Padding.Top, this.DisplayRectangle.Width, topFillHeight);
            Rectangle areaBorder = new Rectangle(this.ClientRectangle.X, this.ClientRectangle.Y, this.ClientRectangle.Width - borderWidth, this.ClientRectangle.Height - borderWidth);

            // draw header
            if (topFillHeight > 0)
            {
                g.FillRectangle(new SolidBrush(topFillColour), areaTop);
            }

            g.DrawRectangle(new Pen(Color.Black, borderWidth), areaBorder);
        }

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

            this.Invalidate();
        }

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

        [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 Description
        {
            get
            {
                return lblDescription.Text?.Replace("\n", "\\n");
            }
            set
            {
                lblDescription.Text = value?.Replace("\\n", "\n");
            }
        }

        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();
        }

        private void label1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            windowDragging = true;
            windowOffset = e.Location;
        }

        private void label1_MouseUp(object sender, MouseEventArgs e)
        {
            windowDragging = false;
        }

        private void label1_MouseMove(object sender, MouseEventArgs e)
        {
            if (windowDragging)
            {
                Point currentScreenPos = PointToScreen(e.Location);
                Location = new Point(currentScreenPos.X - windowOffset.X, currentScreenPos.Y - windowOffset.Y);
            }
        }

        private void label1_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Middle)
            {
                this.TopMost = !this.TopMost;
            }
        }

        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            windowDragging = true;
            windowOffset = e.Location;
            windowSize = new Point(this.Width, this.Height);
        }

        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            windowDragging = false;
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            if (windowDragging)
            {
                this.Size = new Size(e.X - windowOffset.X + this.Width, e.Y - windowOffset.Y + this.Height);
            }
        }

        private void panel2_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
            {
                return;
            }

            windowDragging = true;
            windowOffset = e.Location;
            windowSize = new Point(this.Width, this.Height);
        }

        private void panel2_MouseUp(object sender, MouseEventArgs e)
        {
            windowDragging = false;

        }

        private void panel2_MouseMove(object sender, MouseEventArgs e)
        {
            if (windowDragging)
            {
                this.Size = new Size(windowSize.X, e.Y - windowOffset.Y + this.Height);
            }
        }
    }
}