Scroll Bars

I wish to use a scroll bar as a slider. I've worked out how to get a scrollbar on the screen but I can't figure out how to set its maximum and minimum values or even get it to stay where I move it.

Can anyone help?

Wow, that's two perfectly good threads totally ignored. I must have offended someone pretty high up.

I refuse to beleive that nobody on this board knows how to acheive what I'm looking for.

You can set the range of a scroll bar using SetScrollInfo. You respond to movement by handling the WM_HSCROLL or WM_VSCROLL messages depending on whether the scroll bar is horizontal or vertical. This is slightly complicated, as you have to manually update the position. There is an example at MSDN:

Code:

---

    case WM_HSCROLL:
    {
        SCROLLINFO si    = { 0 };
        int        oldPos = 0;

        si.cbSize = sizeof (si);
        si.fMask  = SIF_ALL;
        GetScrollInfo (hwnd, SB_HORZ, &si);

        // Save the position for comparison later on
        oldPos = si.nPos;

        switch (LOWORD (wParam))
        {
            // user clicked left arrow
            case SB_LINELEFT:
                si.nPos -= 1;
                break;
             
            // user clicked right arrow
            case SB_LINERIGHT:
                si.nPos += 1;
                break;
             
            // user clicked the scroll bar shaft left of the scroll box
            case SB_PAGELEFT:
                si.nPos -= si.nPage;
                break;
             
            // user clicked the scroll bar shaft right of the scroll box
            case SB_PAGERIGHT:
                si.nPos += si.nPage;
                break;
             
            // user dragged the scroll box
            case SB_THUMBTRACK:
                si.nPos = si.nTrackPos;
                break;
             
            default:
                break;
        }

        // Set the position and then retrieve it.  Due to adjustments
        //  by Windows it may not be the same as the value set.
        si.fMask = SIF_POS;
        SetScrollInfo (hwnd, SB_HORZ, &si, TRUE);
        GetScrollInfo (hwnd, SB_HORZ, &si);
       
        if (si.nPos != oldPos)
        {
            // If the position has changed, use the new value
        }

        return 0;
    }

---

However, instead of using a scroll bar, I would strongly suggest you use a trackbar control.

As far as I know, you haven't offended anybody, some questions just slip by.

Thanks, but in my haste I've written my own slider control.