System.Windows.Forms.ThemeWin32Classic.CPDrawScrollButton C# (CSharp) Method

		public override void CPDrawScrollButton (Graphics dc, Rectangle area, ScrollButton type, ButtonState state)
		{
			DrawScrollButtonPrimitive (dc, area, state);
			
			bool fill_rect = true;
			int offset = 0;
			
			if ((state & ButtonState.Pushed) != 0)
				offset = 1;
			
			// skip the border
			Rectangle rect = new Rectangle (area.X + 2 + offset, area.Y + 2 + offset, area.Width - 4, area.Height - 4);
			
			Point [] arrow = new Point [3];
			for (int i = 0; i < 3; i++)
				arrow [i] = new Point ();
			
			Pen pen = SystemPens.ControlText;
			
			if ((state & ButtonState.Inactive) != 0) {
				pen = SystemPens.ControlDark;
			}
			
			switch (type) {
				default:
				case ScrollButton.Down:
					int x_middle = (int)Math.Round (rect.Width / 2.0f) - 1;
					int y_middle = (int)Math.Round (rect.Height / 2.0f) - 1;
					if (x_middle == 1)
						x_middle = 2;
					
					int triangle_height;
					
					if (rect.Height < 8) {
						triangle_height = 2;
						fill_rect = false;
					} else if (rect.Height == 11) {
						triangle_height = 3;
					} else {
						triangle_height = (int)Math.Round (rect.Height / 3.0f);
					}
					
					arrow [0].X = rect.X + x_middle;
					arrow [0].Y = rect.Y + y_middle + triangle_height / 2;
					
					arrow [1].X = arrow [0].X + triangle_height - 1;
					arrow [1].Y = arrow [0].Y - triangle_height + 1;
					arrow [2].X = arrow [0].X - triangle_height + 1;
					arrow [2].Y = arrow [1].Y;
					
					dc.DrawPolygon (pen, arrow);
					
					if ((state & ButtonState.Inactive) != 0) {
						dc.DrawLine (SystemPens.ControlLightLight, arrow [1].X + 1, arrow [1].Y + 1, arrow [0].X + 1, arrow [0].Y + 1);
						dc.DrawLine (SystemPens.ControlLightLight, arrow [1].X, arrow [1].Y + 1, arrow [0].X + 1, arrow [0].Y);
					}
					
					if (fill_rect) {
						for (int i = 0; i < arrow [0].Y - arrow [1].Y; i++) {
							dc.DrawLine (pen, arrow [1].X, arrow [1].Y + i, arrow [2].X, arrow [1].Y + i);
							arrow [1].X -= 1;
							arrow [2].X += 1;
						}
					}
					break;
					
				case ScrollButton.Up:
					x_middle = (int)Math.Round (rect.Width / 2.0f) - 1;
					y_middle = (int)Math.Round (rect.Height / 2.0f);
					if (x_middle == 1)
						x_middle = 2;
					
					if (y_middle == 1)
						y_middle = 2;
					
					if (rect.Height < 8) {
						triangle_height = 2;
						fill_rect = false;
					} else if (rect.Height == 11) {
						triangle_height = 3;
					} else {
						triangle_height = (int)Math.Round (rect.Height / 3.0f);
					}
					
					arrow [0].X = rect.X + x_middle;
					arrow [0].Y = rect.Y + y_middle - triangle_height / 2;
					
					arrow [1].X = arrow [0].X + triangle_height - 1;
					arrow [1].Y = arrow [0].Y + triangle_height - 1;
					arrow [2].X = arrow [0].X - triangle_height + 1;
					arrow [2].Y = arrow [1].Y;
					
					dc.DrawPolygon (pen, arrow);
					
					if ((state & ButtonState.Inactive) != 0) {
						dc.DrawLine (SystemPens.ControlLightLight, arrow [1].X + 1, arrow [1].Y + 1, arrow [2].X + 1, arrow [1].Y + 1);
					}
					
					if (fill_rect) {
						for (int i = 0; i < arrow [1].Y - arrow [0].Y; i++) {
							dc.DrawLine (pen, arrow [2].X, arrow [1].Y - i, arrow [1].X, arrow [1].Y - i);
							arrow [1].X -= 1;
							arrow [2].X += 1;
						}
					}
					break;
					
				case ScrollButton.Left:
					y_middle = (int)Math.Round (rect.Height / 2.0f) - 1;
					if (y_middle == 1)
						y_middle = 2;
					
					int triangle_width;
					
					if (rect.Width < 8) {
						triangle_width = 2;
						fill_rect = false;
					} else if (rect.Width == 11) {
						triangle_width = 3;
					} else {
						triangle_width = (int)Math.Round (rect.Width / 3.0f);
					}
					
					arrow [0].X = rect.Left + triangle_width - 1;
					arrow [0].Y = rect.Y + y_middle;
					
					if (arrow [0].X - 1 == rect.X)
						arrow [0].X += 1;
					
					arrow [1].X = arrow [0].X + triangle_width - 1;
					arrow [1].Y = arrow [0].Y - triangle_width + 1;
					arrow [2].X = arrow [1].X;
					arrow [2].Y = arrow [0].Y + triangle_width - 1;
					
					dc.DrawPolygon (pen, arrow);
					
					if ((state & ButtonState.Inactive) != 0) {
						dc.DrawLine (SystemPens.ControlLightLight, arrow [1].X + 1, arrow [1].Y + 1, arrow [2].X + 1, arrow [2].Y + 1);
					}
					
					if (fill_rect) {
						for (int i = 0; i < arrow [2].X - arrow [0].X; i++) {
							dc.DrawLine (pen, arrow [2].X - i, arrow [1].Y, arrow [2].X - i, arrow [2].Y);
							arrow [1].Y += 1;
							arrow [2].Y -= 1;
						}
					}
					break;
					
				case ScrollButton.Right:
					y_middle = (int)Math.Round (rect.Height / 2.0f) - 1;
					if (y_middle == 1)
						y_middle = 2;
					
					if (rect.Width < 8) {
						triangle_width = 2;
						fill_rect = false;
					} else if (rect.Width == 11) {
						triangle_width = 3;
					} else {
						triangle_width = (int)Math.Round (rect.Width / 3.0f);
					}
					
					arrow [0].X = rect.Right - triangle_width - 1;
					arrow [0].Y = rect.Y + y_middle;
					
					if (arrow [0].X - 1 == rect.X)
						arrow [0].X += 1;
					
					arrow [1].X = arrow [0].X - triangle_width + 1;
					arrow [1].Y = arrow [0].Y - triangle_width + 1;
					arrow [2].X = arrow [1].X;
					arrow [2].Y = arrow [0].Y + triangle_width - 1;
					
					dc.DrawPolygon (pen, arrow);
					
					if ((state & ButtonState.Inactive) != 0) {
						dc.DrawLine (SystemPens.ControlLightLight, arrow [0].X + 1, arrow [0].Y + 1, arrow [2].X + 1, arrow [2].Y + 1);
						dc.DrawLine (SystemPens.ControlLightLight, arrow [0].X, arrow [0].Y + 1, arrow [2].X + 1, arrow [2].Y);
					}
					
					if (fill_rect) {
						for (int i = 0; i < arrow [0].X - arrow [1].X; i++) {
							dc.DrawLine (pen, arrow [2].X + i, arrow [1].Y, arrow [2].X + i, arrow [2].Y);
							arrow [1].Y += 1;
							arrow [2].Y -= 1;
						}
					}
					break;
			}
		}