Thread: How to make to scrollbars work?

Hi,

I'm having some trouble trying to make my vertical scrollbar work. My horizontal scrollbar works, but the vertical doesn't work properly. It seems that the horizontal scrollbar works in parallel with the vertical scrollbar.

I can't figure out whats my problem, can someone help me out?

Here's my code:

Code:

LRESULT CALLBACK HelloWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC		hdc;
	static RECT rect;
	static int iHscrollPos, iVscrollPos, cxChar, cyChar,cxCaps, cxClient, cyClient;
	HCURSOR hCursor ;
	PAINTSTRUCT ps ;
	SCROLLINFO  si;
	TEXTMETRIC  tm ;
	
	switch (message)
	{
		case WM_CREATE:
			hdc = GetDC (hwnd) ;
			
			GetTextMetrics (hdc, &tm) ;
			cxChar = tm.tmAveCharWidth ;
			cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2 ;
			cyChar = tm.tmHeight + tm.tmExternalLeading ;

			SetScrollRange (hwnd, SB_HORZ, 0, 100, FALSE);
			SetScrollPos (hwnd, SB_HORZ, iHscrollPos, TRUE);

			ReleaseDC (hwnd, hdc) ;
			return 0;

		case WM_SIZE:
			cxClient = LOWORD (lParam) ;
			cyClient = HIWORD (lParam) ;
			return 0;

		case WM_HSCROLL:
			switch(LOWORD(wParam))
			{
				case SB_LINERIGHT:
					iHscrollPos += 1;
					break;
				case SB_LINELEFT:
					iHscrollPos -= 1;
					break;
				case SB_THUMBPOSITION:
					iHscrollPos = HIWORD (wParam);
					break;
				default:
					break;
			}
			iHscrollPos = max(0, min(iHscrollPos,100));

			if(iHscrollPos != GetScrollPos(hwnd, SB_HORZ))
			{
				SetScrollPos(hwnd, SB_HORZ, iHscrollPos, TRUE);
				InvalidateRect(hwnd,NULL,TRUE);
			}
			return 0;
		
		case WM_VSCROLL: //to get all the vertical scroll bar information
			switch (LOWORD (wParam))
			{
				case SB_TOP:
					si.nPos = si.nMin ; 
					break;
				case SB_BOTTOM:
					si.nPos = si.nMax ; 
					break;
				case SB_LINEUP:
					//iHscrollPos -= 1;
					si.nPos -= 1 ;
					break;
				case SB_LINEDOWN:
					//iHscrollPos += 1;
					si.nPos += 1 ;
					break;
				case SB_PAGEUP:
					si.nPos -= si.nPage ;
					break ;
				case SB_PAGEDOWN:
					si.nPos += si.nPage ;
					break ;
				case SB_THUMBTRACK:
					si.nPos = si.nTrackPos ;
					break ;
				default:
					break ;
			}
			si.fMask = SIF_POS ;
			iHscrollPos = max(0, min(iHscrollPos,100));
			
			if(iHscrollPos != GetScrollPos(hwnd, SB_VERT))
			{
				SetScrollPos(hwnd, SB_VERT, iHscrollPos, TRUE);
				InvalidateRect(hwnd,NULL,TRUE);
			}
			return 0 ;
		case WM_PAINT:
			hdc = BeginPaint(hwnd, &ps);
			EndPaint(hwnd, &ps);
			return 0;
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;

	}
	return DefWindowProc(hwnd, message, wParam, lParam);
}

thanks, I think got it running now.