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

		public override void DataGridPaintColumnHeaders (Graphics g, Rectangle clip, DataGrid grid)
		{
			if (!grid.CurrentTableStyle.ColumnHeadersVisible)
				return;

			Rectangle columns_area = grid.column_headers_area;

			// Paint corner shared between row and column header
			if (grid.CurrentTableStyle.CurrentRowHeadersVisible) {
				Rectangle rect_bloc = grid.column_headers_area;
				rect_bloc.Width = grid.RowHeaderWidth;
				if (clip.IntersectsWith (rect_bloc)) {
					if (grid.FlatMode)
						g.FillRectangle (ResPool.GetSolidBrush (grid.CurrentTableStyle.CurrentHeaderBackColor), rect_bloc);
					else
						CPDrawBorder3D (g, rect_bloc, Border3DStyle.RaisedInner, 
							Border3DSide.Left | Border3DSide.Right | 
							Border3DSide.Top | Border3DSide.Bottom | Border3DSide.Middle, 
							grid.CurrentTableStyle.CurrentHeaderBackColor);
				}

				columns_area.X += grid.RowHeaderWidth;
				columns_area.Width -= grid.RowHeaderWidth;
			}

			// Set column painting
			Rectangle rect_columnhdr = new Rectangle ();
			int col_pixel;
			Region current_clip;
			Region prev_clip = g.Clip;
			rect_columnhdr.Y = columns_area.Y;
			rect_columnhdr.Height = columns_area.Height;

			int column_cnt = grid.FirstVisibleColumn + grid.VisibleColumnCount;
			for (int column = grid.FirstVisibleColumn; column < column_cnt; column++) {
				if (grid.CurrentTableStyle.GridColumnStyles[column].bound == false)
					continue;
				
				col_pixel = grid.GetColumnStartingPixel (column);
				rect_columnhdr.X = columns_area.X + col_pixel - grid.HorizPixelOffset;
				rect_columnhdr.Width = grid.CurrentTableStyle.GridColumnStyles[column].Width;

				if (clip.IntersectsWith (rect_columnhdr) == false)
					continue;

				current_clip = new Region (rect_columnhdr);
				current_clip.Intersect (columns_area);
				current_clip.Intersect (prev_clip);
				g.Clip = current_clip;

				DataGridPaintColumnHeader (g, rect_columnhdr, grid, column);

				current_clip.Dispose ();
			}

			g.Clip = prev_clip;
				
			Rectangle not_usedarea = grid.column_headers_area;
			not_usedarea.X = (column_cnt == 0) ? grid.RowHeaderWidth : rect_columnhdr.X + rect_columnhdr.Width;
			not_usedarea.Width = grid.ClientRectangle.X + grid.ClientRectangle.Width - not_usedarea.X;
			g.FillRectangle (ResPool.GetSolidBrush (grid.BackgroundColor), not_usedarea);
		}