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How To Find Out If A Scrollbar Is Visible

Posted on 2004-03-24
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Last Modified: 2013-11-20
I have a CListCtrl, and I need to find out if it's vertical scrollbar is visible and what the scrollbar's width is so that I can resize the columns and remove the need to scroll horizontally.  I've tried the GetScrollBarCtrl(SB_VERT);, but I always get NULL.  I'm sure it's something stupid, but I haven't found the right function(s) for this.  Thanks in advance.
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Question by:mnashadka
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by:abesoft
abesoft earned 200 total points
ID: 10672231
I've used something like this before:
    SCROLLINFO info = {sizeof( SCROLLINFO)};
    info.fMask = SIF_RANGE;
    if (m_StatementsList.GetScrollInfo( SB_HORZ, &info, SIF_RANGE) &&
        ((info.nMax - info.nMin) > windowRect.Height()))
        OutputDebugString( "No horizontal scroll bar detected\r\n");
    else
    {
        OutputDebugString( "Horizontal scroll bar detected\r\n");
        width += GetSystemMetrics( SM_CXHSCROLL);
    }

Obviously, you would want to wrap this up into a function....
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by:abesoft
ID: 10672251
Oh, that chunk of code should be preceded by:
      CRect windowRect;
      m_StatementsList.GetWindowRect( &windowRect);
And this code assumes you are testing for a scrollbar in a control called m_StatementsList.
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AlexFM earned 300 total points
ID: 10674933
I always use the following code to resize list control columns so that they don't depend on vertical scrollbar. Suppose I need 3 columns with equal size:

    CRect rect;
    m_list_ctrl.GetClientRect(&rect);
    int nWidth = rect.Width() - GetSystemMetrics(SM_CXVSCROLL) - 5;   // vertical scrollbar width correction
    int nWidth1 = nWidth / 3;
    int nWidth2 = nWidth / 3;
    int nWidth3 = nWidth - nWidth1 - nWidth2;

    // insert columns with width nWidth1, nWidth2 and nWidth3

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by:mnashadka
ID: 10678089
Thank you both for your help.
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