OOGL.GUI.Widgets.ComboBox.DrawToFrameBuffer C# (CSharp) Method

        public override void DrawToFrameBuffer(double gameTime)
        {
            base.DrawToFrameBuffer(gameTime);

            int size = clientRectangle.Height;
            if (size < 5) return;

			RectangleF fontSize = frameMgr.textPrinter.Measure("0", Font).BoundingBox;
			
            Rectangle screenRectClient = ClientToScreen(clientRectangle);
            screenRectText = new Rectangle(screenRectClient.X, screenRectClient.Y, clientRectangle.Width - size, clientRectangle.Height);
            screenRectButton = new Rectangle(screenRectClient.Right - size, screenRectClient.Y, size, size);

            object[] items = Items;
            Rectangle[] itemRects = new Rectangle[items.Length];
            for (int i = 0; i < items.Length; i++)
            {
                itemRects[i] = new Rectangle(screenRectClient.X, screenRectClient.Bottom + ((int)fontSize.Height * i) + 1, screenRectClient.Width, (int)fontSize.Height);
            }
            screenRectDropListItems = itemRects;

            Rectangle frameRectText = ScreenToFrame(screenRectText);
            Rectangle frameRectButton = ScreenToFrame(screenRectButton);

            List<PositionColor> verts = new List<PositionColor>();

            verts.Add(new PositionColor(new Vector3(frameRectButton.Left, frameRectButton.Top, 0f), Gradient(Color.Gray, 255)));
            verts.Add(new PositionColor(new Vector3(frameRectButton.Left, frameRectButton.Bottom, 0f), Gradient(Color.Gray, 127)));
            verts.Add(new PositionColor(new Vector3(frameRectButton.Right, frameRectButton.Top, 0f), Gradient(Color.Gray, 127)));

            verts.Add(new PositionColor(new Vector3(frameRectButton.Left, frameRectButton.Bottom, 0f), Gradient(Color.Gray, 127)));
            verts.Add(new PositionColor(new Vector3(frameRectButton.Right, frameRectButton.Bottom, 0f), Gradient(Color.Gray, 0)));
            verts.Add(new PositionColor(new Vector3(frameRectButton.Right, frameRectButton.Top, 0f), Gradient(Color.Gray, 127)));

            verts.Add(new PositionColor(new Vector3(frameRectButton.Left + 2, frameRectButton.Top + 2, 0f), Gradient(Color.LightGray, 255)));
            verts.Add(new PositionColor(new Vector3(frameRectButton.Left + (size / 2), frameRectButton.Bottom - 2, 0f), Gradient(Color.LightGray, 100)));
            verts.Add(new PositionColor(new Vector3(frameRectButton.Right - 2, frameRectButton.Top + 2, 0f), Gradient(Color.LightGray, 127)));

            if (showDropList)
            {
                for (int i = 0; i < items.Length; i++)
                {
                    Rectangle frameRectDropListItem = ScreenToFrame(screenRectDropListItems[i]);

                    verts.Add(new PositionColor(new Vector3(frameRectDropListItem.Left, frameRectDropListItem.Top, 0f), Color.Gray));
                    verts.Add(new PositionColor(new Vector3(frameRectDropListItem.Left, frameRectDropListItem.Bottom, 0f), Color.Gray));
                    verts.Add(new PositionColor(new Vector3(frameRectDropListItem.Right, frameRectDropListItem.Top, 0f), Color.Gray));

                    verts.Add(new PositionColor(new Vector3(frameRectDropListItem.Left, frameRectDropListItem.Bottom, 0f), Color.Gray));
                    verts.Add(new PositionColor(new Vector3(frameRectDropListItem.Right, frameRectDropListItem.Bottom, 0f), Color.Gray));
                    verts.Add(new PositionColor(new Vector3(frameRectDropListItem.Right, frameRectDropListItem.Top, 0f), Color.Gray));
                }
            }

            PositionColor.Draw(BeginMode.Triangles, verts.ToArray());
            
            Frame.DrawText(Font, Text, frameRectText, DrawTextFormat.Bottom | DrawTextFormat.WordBreak, Color.Black);
            if (showDropList)
            {
                for (int i = 0; i < items.Length; i++)
                {
                    Rectangle frameRectDropListItem = ScreenToFrame(screenRectDropListItems[i]);
                    Frame.DrawText(Font, items[i].ToString(), frameRectDropListItem, DrawTextFormat.Left | DrawTextFormat.Bottom, Color.Black);
                }
            }
        }