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02.13.2008 at 08:12AM PST, ID: 23159999
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8.0

How to repaint text that disappeared using V scrollbar?

Asked by mcravenufo in Microsoft Programming, C++ Programming Language, Microsoft Visual C++

Tags:

I am trying to repaint text that moved out of the visible area using a vertical scrollbar. I scroll down until my text is out of sight, however, when I scroll back up the text does not redraw. Also, if I minimize the window and restore it, the text will show back up. However, if the window is not in its top vertical scrollbar position the text is printed out as if it was but since the window was not at its top position the text is in the wrong position. This is using Windows SDK.Start Free Trial 
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case WM_PAINT:
    {
        hdc = BeginPaint(hDlgWnd, &ps);
        TextOut(hdc, 72, 49, "This is a test", 14);
        EndPaint(hDlgWnd, &ps);
 
        break;
    }
 
    case WM_SIZE:
    {
        // Retrieve the dimensions of the client area.
        int yClient = HIWORD(lParam);
 
        // Set the vertical scrolling range and page size
        siSms.cbSize    = sizeof(siSms);
        siSms.fMask     = SIF_RANGE | SIF_PAGE;
        siSms.nMin      = 0;
        siSms.nMax      = 32 - 1;
        siSms.nPage     = yClient / yChar;
 
        SetScrollInfo(hDlgWnd, SB_VERT, &siSms, TRUE);
 
        break;
    }
    case WM_VSCROLL:
    {
        // Get all the vertial scroll bar information
        int nscroll_code = LOWORD(wParam);
 
        siSms.cbSize    = sizeof(siSms);
        siSms.fMask     = SIF_ALL;
 
        GetScrollInfo(hDlgWnd, SB_VERT, &siSms);
 
        // Save the position for comparison later on
        yPos = siSms.nPos;
 
        switch(nscroll_code)
        {
        case SB_THUMBTRACK:
            siSms.nPos = siSms.nTrackPos;
 
            break;
 
        case SB_PAGEDOWN:
            siSms.nPos += siSms.nPage;
 
            break;
 
        case SB_PAGEUP:
            siSms.nPos -= siSms.nPage;
 
            break;
 
        case SB_LINEDOWN:
            siSms.nPos += 1;
 
            break;
 
        case SB_LINEUP:
            siSms.nPos -= 1;
 
            break;
        }
 
        // Set the position and then retrieve it.  Due to adjustments
        //  by Windows it may not be the same as the value set.
        siSms.fMask = SIF_POS;
        SetScrollInfo(hDlgWnd, SB_VERT, &siSms, TRUE);
        GetScrollInfo(hDlgWnd, SB_VERT, &siSms);
 
        // If the position has changed, scroll window and update it
        if(siSms.nPos != yPos)
        {
            ScrollWindow(hDlgWnd, 0, 7 * (yPos - siSms.nPos), NULL, NULL);
            UpdateWindow(hDlgWnd);
        }
 
Keywords: How to repaint text that disappeared u…
Title
1 redraw/repaint
2 Scrollbar problem XP themes
3 How to repaint an activex control
4 MDI repaint/refresh
5 scrollbars
6 Delphi 7 TListView Force Repaint
 
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[+][-]02.15.2008 at 07:26AM PST, ID: 20902514

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[+][-]02.15.2008 at 09:21AM PST, ID: 20903808

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[+][-]02.15.2008 at 10:30AM PST, ID: 20904493

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About this solution

Zones: Microsoft Programming, C++ Programming Language, Microsoft Visual C++
Tags: Windows SDK, C++
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Solution Provided By: wayside
Participating Experts: 1
Solution Grade: A
 
 
 
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