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

namespace RyzStudio.Windows.ThemedForms
{
    using System;
    using System.ComponentModel;
    using System.Drawing;
    using System.Windows.Forms;

    public partial class Form : System.Windows.Forms.Form
    {
		protected Color topFillColour = Color.FromArgb(15, 15, 15);
		protected int topFillHeight = 52;

		protected Color bottomFillColour = Color.FromArgb(15, 15, 15);
		protected int bottomFillMargin = 19;

        protected int borderWidth = 1;

        public Form()
        {
            this.InitializeComponent();

			this.BackColor = Color.FromArgb(246, 246, 246);
		}

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

            this.Invalidate();
        }

        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 areaBottom = new Rectangle(this.DisplayRectangle.Left, (this.DisplayRectangle.Height - bottomFillMargin), this.DisplayRectangle.Width, bottomFillMargin);
            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);
			}

            // draw footer
			if (bottomFillMargin > 0)
			{
				g.FillRectangle(new SolidBrush(bottomFillColour), areaBottom);
			}

			// draw logo
			if (this.TitleLogo != null)
			{
				g.DrawImageUnscaled(this.TitleLogo, this.Padding.Left, this.Padding.Top);
			}

			if (this.Banner != null)
			{
				g.DrawImageUnscaled(this.Banner, this.Padding.Left, (this.DisplayRectangle.Height - this.Banner.Height - bottomFillMargin), (this.DisplayRectangle.Width - (this.Padding.Left + this.Padding.Right)), this.Banner.Height);
			}

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

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

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

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

        public void SetValue(Label sender, string value)
		{
			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { sender.Text = value; }));
			}
			else
			{
				sender.Text = value;
			}
		}

		public void SetValue(GroupBox sender, string value)
		{
			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { sender.Text = value; }));
			}
			else
			{
				sender.Text = value;
			}
		}

		public void AddValue(ListBox sender, string value)
		{
			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { sender.Items.Add(value); }));
			}
			else
			{
				sender.Items.Add(value);
			}
		}

		public void ClearValues(ListBox sender)
		{
			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { sender.Items.Clear(); }));
			}
			else
			{
				sender.Items.Clear();
			}
		}

		public string GetValue(ListBox sender)
		{
			string rv = string.Empty;

			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { rv = (sender.SelectedItem == null) ? string.Empty : sender.SelectedItem.ToString(); }));
			}
			else
			{
				rv = (sender.SelectedItem == null) ? string.Empty : sender.SelectedItem.ToString();
			}

			return rv;
		}

		public string GetValue(TextBox sender)
		{
			string rv = string.Empty;

			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { rv = sender.Text.Trim(); }));
			}
			else
			{
				rv = sender.Text.Trim();
			}

			return rv;
		}

		public int GetValue(NumericUpDown sender)
		{
			int rv = 0;

			if (sender.InvokeRequired)
			{
				sender.Invoke(new MethodInvoker(() => { rv = (int)sender.Value; }));
			}
			else
			{
				rv = (int)sender.Value;
			}

			return rv;
		}
	}
}