ComponentFactory.Krypton.Toolkit.RenderStandard.DrawRibbonQATFullbarSquare C# (CSharp) Method

        protected virtual IDisposable DrawRibbonQATFullbarSquare(RenderContext context,
                                                                 Rectangle rect,
                                                                 PaletteState state,
                                                                 IPaletteRibbonBack palette,
                                                                 IDisposable memento)
        {
            if ((rect.Width > 0) && (rect.Height > 0))
            {
                Color c1 = palette.GetRibbonBackColor1(state);
                Color c2 = palette.GetRibbonBackColor2(state);
                Color c3 = palette.GetRibbonBackColor3(state);

                bool generate = true;
                MementoRibbonQATFullbarSquare cache;

                // Access a cache instance and decide if cache resources need generating
                if ((memento == null) || !(memento is MementoRibbonQATFullbarSquare))
                {
                    if (memento != null)
                        memento.Dispose();

                    cache = new MementoRibbonQATFullbarSquare(rect, c1, c2, c3);
                    memento = cache;
                }
                else
                {
                    cache = (MementoRibbonQATFullbarSquare)memento;
                    generate = !cache.UseCachedValues(rect, c1, c2, c3);
                }

                // Do we need to generate the contents of the cache?
                if (generate)
                {
                    // Dispose of existing values
                    cache.Dispose();

                    cache.lightPen = new Pen(c1);
                    cache.mediumBrush = new SolidBrush(c2);
                    cache.darkPen = new Pen(c3);
                }

                // Fill entire area in background brush
                context.Graphics.FillRectangle(cache.mediumBrush, rect);

                // Draw the outside border
                context.Graphics.DrawRectangle(cache.darkPen, rect.X, rect.Y, rect.Width - 1, rect.Height - 1);

                // Draw ligher top and bottom lines
                context.Graphics.DrawLine(cache.lightPen, rect.X + 1, rect.Y + 1, rect.Width - 2, rect.Y + 1);
                context.Graphics.DrawLine(cache.lightPen, rect.X + 1, rect.Bottom - 2, rect.Width - 2, rect.Bottom - 2);
            }

            return memento;
        }