TweetDuck/Controls/FlatProgressBar.cs

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

namespace TweetDuck.Controls {
	sealed class FlatProgressBar : ProgressBar {
		private readonly SolidBrush brush;

		public FlatProgressBar() {
			brush = new SolidBrush(Color.White);

			SetStyle(ControlStyles.UserPaint, true);
			SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
		}

		public void SetValueInstant(int value) {
			ControlExtensions.SetValueInstant(this, Math.Max(Minimum, Math.Min(Maximum, value)));
		}

		protected override void OnPaint(PaintEventArgs e) {
			if (brush.Color != ForeColor) {
				brush.Color = ForeColor;
			}

			Rectangle rect = e.ClipRectangle;
			rect.Width = (int) (rect.Width * ((double) Value / Maximum));
			e.Graphics.FillRectangle(brush, rect);
		}

		protected override void Dispose(bool disposing) {
			base.Dispose(disposing);

			if (disposing) {
				brush.Dispose();
			}
		}
	}
}