System.Windows.Forms.XplatUIX11.TranslateClientRectangleToXClientRectangle C# (CSharp) Method

		internal static Rectangle TranslateClientRectangleToXClientRectangle (Hwnd hwnd, Control ctrl)
		{
			/* 
			 * If this is a form with no window manager, X is handling all the border and caption painting
			 * so remove that from the area (since the area we set of the window here is the part of the window 
			 * we're painting in only)
			 */
			Rectangle rect = hwnd.ClientRect;
			Form form = ctrl as Form;
			CreateParams cp = null;

			if (form != null)
				cp = form.GetCreateParams ();

			if (form != null && (form.window_manager == null && !cp.IsSet (WindowExStyles.WS_EX_TOOLWINDOW))) {
				Hwnd.Borders borders = Hwnd.GetBorders (cp, null);
				Rectangle xrect = rect;

				xrect.Y -= borders.top;
				xrect.X -= borders.left;
				xrect.Width += borders.left + borders.right;
				xrect.Height += borders.top + borders.bottom;

				rect = xrect;
			}
			
			if (rect.Width < 1 || rect.Height < 1) {
				rect.Width = 1;
				rect.Height = 1;
				rect.X = -5;
				rect.Y = -5;
			}
			
			return rect;
		}