ListCtrl Custom Draw

[ROK_RShadow]

I have been reading Michael Dunn's article about Custom Draw and the List Control to figure out how to change the background and text color to change on a selected item. I have tried the code below in both the pre and post paint stages. Also in both stages I have tryed returning both CDRF_DODEFAULT and CDRF_SKIPDEFAULT, either nothing happens.. or no selection highlight is drawn. Anybody have any ideas? I'm lost with Custom Draw.. I don't understand why I can change the text/bk color for every item.. but if I test for a selected item, and then try and change the text/bk color.. nadda.. nothing .. zip..

void CPlayListWindow::OnCustomDrawList ( NMHDR* pNMHDR, LRESULT* pResult )
{
	NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR );


	// tell windows to draw the control its self
	// unless we change it
	*pResult = 0;

	// Now we need to check the draw stage
	// if the stage is at the pre paint stage
	// we need to tell windows that we want
	// messages for every item
	if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage)
		*pResult = CDRF_NOTIFYITEMDRAW;
	

	else if(CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage)
	{
		// This is the prepaint stage for each 
		// individual item.
		*pResult = CDRF_NOTIFYPOSTPAINT;
	}
	else if(CDDS_ITEMPOSTPAINT == pLVCD->nmcd.dwDrawStage)
	{
	
		// first we are going to check to see if the
		// item is selected. If it is we are going
		// to tell it the background color
		// is transparent (black) and the text color is blue
		LVITEM rItem;
        int    nItem = static_cast<int>( pLVCD->nmcd.dwItemSpec );

		ZeroMemory ( &rItem, sizeof(LVITEM) );
        rItem.mask  = LVIF_IMAGE | LVIF_STATE;
        rItem.iItem = nItem;
        rItem.stateMask = LVIS_SELECTED;
		GetListCtrl().GetItem(&rItem);
		
		if(rItem.state == LVIS_SELECTED)
		{
			// now lets change the items color
			pLVCD->clrTextBk = RGB(0,0,255);
			pLVCD->clrText = RGB(0,0,255);


			// Tell windows to draw it for us now
			//*pResult = CDRF_DODEFAULT
			*pResult = CDRF_SKIPDEFAULT;
		}
	
	}

}

C# a poor attempt at bringing C++ to the VB masses

[Roger Allen]

I have been working from the same article just yesterday. Hers a copy of mu OnCustom draw...

void CCommunicationView::OnCustomDrawLog(NMHDR* pNMHDR, LRESULT* pResult)
{
NMLVCUSTOMDRAW *pLVCD = reinterpret_cast(pNMHDR);

\*pResult = CDRF\_DODEFAULT;			// assume normal windows drawn control

if (CDDS\_PREPAINT == pLVCD->nmcd.dwDrawStage)
{
	\*pResult = CDRF\_NOTIFYITEMDRAW;
}
else if (CDDS\_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage)
{
	// this is the prepaint stage, we need each sub-item pre-paint
	\*pResult = CDRF\_NOTIFYSUBITEMDRAW;
}
else if ((CDDS\_ITEMPREPAINT | CDDS\_SUBITEM) == pLVCD->nmcd.dwDrawStage)
{
	// now render the image if it has one
	int		item = pLVCD->nmcd.dwItemSpec;
	LVITEM rItem;
    ZeroMemory(&rItem, sizeof(LVITEM));
    rItem.mask = LVIF\_IMAGE | LVIF\_STATE;
    rItem.iItem = item;
    rItem.stateMask = LVIS\_SELECTED;
    m\_Log.GetItem(&rItem );
	// we render the text ourselves in the right colour and take tabs into account
	int		value = m\_Log.GetItemData(item);
	CDC\*	pDC = CDC::FromHandle ( pLVCD->nmcd.hdc );
	CRect	rcText;
	CRect	rcIcon;
	CString	text;
	
	m\_Log.GetItemRect(item, &rcIcon, LVIR\_ICON);
	m\_Log.GetItemRect(item, &rcText, LVIR\_BOUNDS);
	rcText.left += rcIcon.Width();

	text = m\_Log.GetItemText(item, 0);
	if (rItem.state & LVIS\_SELECTED)
	{
		pDC->SetTextColor(GetSysColor(COLOR\_HIGHLIGHTTEXT));
		CBrush	brush(GetSysColor(COLOR\_HIGHLIGHT));
		pDC->FillRect(rcText, &brush);
	}
	else
	{
		pDC->SetTextColor(value);
		CBrush	brush(GetSysColor(COLOR\_HIGHLIGHTTEXT));
		pDC->FillRect(rcText, &brush);
	}
	pDC->DrawText(text, rcText, DT\_END\_ELLIPSIS | DT\_EXPANDTABS | DT\_SINGLELINE | DT\_VCENTER);
	pLVCD->clrText = value;
	m\_ilLog.Draw(pDC, rItem.iImage, rcIcon.TopLeft(), ILD\_TRANSPARENT);
	\*pResult = CDRF\_SKIPDEFAULT;
}

}

Roger Allen Sonork 100.10016 Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003

[ROK_RShadow]

Thanks for the quick reply. I got it working.. but I am still confused. I don't understand why I have to draw it out in the pre paint stage. Post paint I might be able to understand.. but I don't understand why I can loop through message for each Item, and change there colors using nmcd.clr...() but I can't check if the item is selected and use mncd to change color????? C# a poor attempt at bringing C++ to the VB masses