SIL.FieldWorks.Common.Widgets.VSTabControl.DrawTabItem C# (CSharp) Method

		private void DrawTabItem(Graphics g, int index, TabItemState state, Rectangle tabRect, StringFormat textFmt)
		{
			//if scroller is visible and the tab is fully placed under it we don't need to draw such tab
			if (fUpDown.X <= 0 || tabRect.X < fUpDown.X)
			{
				/* We will draw our tab on the bitmap and then will transfer image on the control
				 * graphic context.*/

				using (Bitmap bmp = new Bitmap(tabRect.Width, tabRect.Height))
				{
					Rectangle drawRect = new Rectangle(0, 0, tabRect.Width, tabRect.Height);
					using (Graphics bitmapContext = Graphics.FromImage(bmp))
					{
						TabRenderer.DrawTabItem(bitmapContext, drawRect, state);
						if (state == TabItemState.Selected && tabRect.X == 0)
						{
							int corrY = bmp.Height - 1;
							bmp.SetPixel(0, corrY, bmp.GetPixel(0, corrY - 1));
						}
						/* Important moment. If tab alignment is bottom we should flip image to display tab
						 * correctly.*/

						if (this.Alignment == TabAlignment.Bottom)
							bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);

						Rectangle focusRect = Rectangle.Inflate(drawRect, -3, -3);
						//focus rect
						TabPage pg = this.TabPages[index];
						//tab page whose tab we're drawing
						//trying to get tab image if any
						Image pagePict = GetImageByIndexOrKey(pg.ImageIndex, pg.ImageKey);
						if (pagePict != null)
						{
							//If tab image is present we should draw it.
							Point imgLoc = state == TabItemState.Selected ? new Point(8, 2) : new Point(6, 2);
							if (this.Alignment == TabAlignment.Bottom)
								imgLoc.Y = drawRect.Bottom - 2 - pagePict.Height;
							bitmapContext.DrawImageUnscaled(pagePict, imgLoc);
							//Correcting rectangle for drawing text.
							drawRect.X += imgLoc.X + pagePict.Width;
							drawRect.Width -= imgLoc.X + pagePict.Width;
						}
						//drawing tab text
						using (Brush b = new SolidBrush(SystemColors.ControlText))
							bitmapContext.DrawString(pg.Text, this.Font, b, (RectangleF)drawRect, textFmt);
						//and finally drawing focus rect(if needed)
						if (this.Focused && state == TabItemState.Selected)
							ControlPaint.DrawFocusRectangle(bitmapContext, focusRect);
					}
					//If the tab has part under scroller we shouldn't draw that part.
					int shift = state == TabItemState.Selected ? 2 : 0;
					if (fUpDown.X > 0 && fUpDown.X >= tabRect.X - shift && fUpDown.X < tabRect.Right + shift)
						tabRect.Width -= tabRect.Right - fUpDown.X + shift;
					g.DrawImageUnscaledAndClipped(bmp, tabRect);
				}
			}
		}

 protected override void WndProc(ref Message m)
 {
     //if native updown is destroyed we need release our hook
     if (m.Msg == NativeMethods.WM_DESTROY || m.Msg == NativeMethods.WM_NCDESTROY)
     {
         this.ReleaseHandle();
     }
     else if (m.Msg == NativeMethods.WM_WINDOWPOSCHANGING)
     {
         //When scroller position is changed we should remember that new position.
         x = ((NativeMethods.WINDOWPOS)m.GetLParam(typeof(NativeMethods.WINDOWPOS))).x;
     }
     else if (m.Msg == NativeMethods.WM_MOUSEMOVE && fparent.lastHotIndex > 0 &&
              fparent.lastHotIndex != fparent.SelectedIndex)
     {
         //owerdrawing former hot tab as normal
         using (Graphics context = Graphics.FromHwnd(fparent.Handle))
         {
             using (StringFormat textFormat = new StringFormat())
             {
                 textFormat.Alignment     = StringAlignment.Center;
                 textFormat.LineAlignment = StringAlignment.Center;
                 fparent.DrawTabItem(context, fparent.lastHotIndex, TabItemState.Normal,
                                     fparent.GetTabRect(fparent.lastHotIndex), textFormat);
                 if (fparent.lastHotIndex - fparent.SelectedIndex == 1)
                 {
                     Rectangle selRect = fparent.GetTabRect(fparent.SelectedIndex);
                     selRect.Inflate(2, 2);
                     fparent.DrawTabItem(context, fparent.SelectedIndex, TabItemState.Selected, selRect, textFormat);
                 }
             }
         }
     }
     else if (m.Msg == NativeMethods.WM_LBUTTONDOWN)
     {
         Rectangle invalidRect = fparent.GetTabRect(fparent.SelectedIndex);
         invalidRect.X = 0; invalidRect.Width = 2;
         invalidRect.Inflate(0, 2);
         fparent.Invalidate(invalidRect);
     }
     else if (m.Msg == NativeMethods.WM_SHOWWINDOW)
     {
         // If the scroll control for the labels is being hidden we need to stop
         // clipping the labels.
         // USUALLY we get WM_WINDOWPOSCHANGING with position 0 as well as this
         // message, but not while starting up a parent control that gets laid out
         // twice, first at a width that needs the scroll control and later at a width
         // that does not. See FWR-1794 for one case where this can be a problem.
         if (m.WParam.ToInt32() == 0)                     // window being hidden
         {
             x = 0;
         }
     }
     base.WndProc(ref m);
 }