Re: Custom drawing CListCtrl problem (with picture!)

15 Jul 2006 09:39:56 -0700
Anyone have any ideas? wrote:

I'd like to add that if in the OnPaint method instead of only showing
visible items I draw every item (visible or not) by doing something
for(int i = 0; i < GetItemCount(); i++)

It works fine. There is no artifact at all, I've tried extending the
range that its drawing a bit doing something like this:
int iStart = GetTopIndex()-2;
    int iEnd = iStart + GetCountPerPage()+2;
    if(iStart < 0)
        iStart = 0;
    if(iEnd > GetItemCount())
        iEnd = GetItemCount();

    for(int i = iStart; i < iEnd; i++) {

With no success. wrote:

I've got a CListCtrl that uses the custom data style to handle a
massive amount of data, and I'm having wierd artifacts during custom

I've tried several methods of drawing. The first I tried was completely
overriding OnPaint:

int iStart = GetTopIndex();
    int iEnd = iStart + GetCountPerPage();
    cprintf("Drawing range %d to %d (%d)\n", iStart, iEnd, iEnd-iStart);
    for(int i = iStart; i < iEnd; i++) {

        bSelected = GetItemState(i, LVIS_SELECTED) & LVIS_SELECTED;

        if(bSelected) {
            GetItemRect(i, &rItem, NULL);
            rItem.right = rClient.right;
            dc.FillSolidRect(&rItem, RGB(243, 242, 240));

        for(int j = 0; j < 1; j++) {
            // CHANGED 1.07 LVIR_BOUNDS to LVIR_LABEL
            if(GetSubItemRect(i, j, LVIR_LABEL, rItem)) {
                sText = GetItemText(i, j);

                if(m_bHyperlink[j]) {
                    dc.SetTextColor( RGB(0, 0, 255) );
                else {
                    dc.SetTextColor( RGB(85, 85, 85) );
                    if(bSelected) {
                        dc.SetTextColor(RGB(108, 132, 145));

                rItem.left += 5;

                if(j ==0) {
                    cprintf("Drawing Item: %s %d %d %d %d height = %d width = %d\n",
sText, rItem.left,
              , rItem.right, rItem.bottom, rItem.Height(),

                // CHANGED 1.07 to fix column text overflop problem
                DrawItemText(&dc, sText, rItem, rItem.Width(), LVCFMT_LEFT);

The second I tried was using the NM_CUSTOMDRAW handlers:


    *pResult = 0;

    if(pNMCD->nmcd.dwDrawStage == CDDS_PREPAINT) {
        *pResult = CDRF_NOTIFYITEMDRAW;
    else if(pNMCD->nmcd.dwDrawStage == CDDS_ITEMPREPAINT) {
        CRect rc;
        GetSubItemRect(pNMCD->nmcd.dwItemSpec, pNMCD->iSubItem, LVIR_LABEL,

        CDC dc;
        //CMemDC dc(&cdc, rc);

        CString sText;
        sText = GetItemText(pNMCD->nmcd.dwItemSpec, pNMCD->iSubItem);
        cprintf("Drawing item %s height = %d width = %d item = %d sub =
%d\n", sText,
            rc.Height(), rc.Width(), pNMCD->nmcd.dwItemSpec, pNMCD->iSubItem);
        dc.DrawText(sText, &rc, NULL);

        *pResult = CDRF_SKIPDEFAULT;

Both ways I am getting strange artifacts when scrolling. The problem is
MUCH more pronounced when using the NM_CUSTOMDRAW method. When using
the OnPaint method it only appears when scrolling down - but not
scrolling up. It appears that something is erasing part of the control
once drawn. You can see what is happening at

The top part is what the list box looks like before I scroll, the
bottom part is what is happening on scroll.

Any tips would be appreciated! Thanks.

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