gitextensions-ICSharpCode.TextEditor/Project/Src/Gui/BrushRegistry.cs

// <file>
//     <copyright see="prj:///doc/copyright.txt"/>
//     <license see="prj:///doc/license.txt"/>
//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
//     <version>$Revision$</version>
// </file>

using System.Collections.Generic;
using System.Drawing;

namespace ICSharpCode.TextEditor
{
    /// <summary>
    ///     Contains brushes/pens for the text editor to speed up drawing. Re-Creation of brushes and pens
    ///     seems too costly.
    /// </summary>
    public class BrushRegistry
    {
        private static readonly Dictionary<Color, Brush> brushes = new Dictionary<Color, Brush>();
        private static readonly Dictionary<Color, Pen> pens = new Dictionary<Color, Pen>();
        private static readonly Dictionary<Color, Pen> dotPens = new Dictionary<Color, Pen>();

        private static readonly float[] dotPattern = {1, 1, 1, 1};

        public static Brush GetBrush(Color color)
        {
            lock (brushes)
            {
                if (!brushes.TryGetValue(color, out var brush))
                {
                    brush = new SolidBrush(color);
                    brushes.Add(color, brush);
                }

                return brush;
            }
        }

        public static Pen GetPen(Color color)
        {
            lock (pens)
            {
                if (!pens.TryGetValue(color, out var pen))
                {
                    pen = new Pen(color);
                    pens.Add(color, pen);
                }

                return pen;
            }
        }

        public static Pen GetDotPen(Color color)
        {
            lock (dotPens)
            {
                Pen pen;
                if (!dotPens.TryGetValue(color, out pen))
                {
                    pen = new Pen(color);
                    pen.DashPattern = dotPattern;
                    dotPens.Add(color, pen);
                }

                return pen;
            }
        }
    }
}