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dynamically change background color for certain cells in the CListCtrl using report style

Posted on 2008-10-23
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Last Modified: 2013-11-20
I use CListCtrl with report style to list some text with grids.
I would like to change the background color for some cells.
For example, if the user push button A, the background for the cell at row 3 and col 4 will be changed to yellow. And if the user push button B, the the background for the cell at row 3 and col 4 will be changed to red. I have been searched the internet for good solutions but they are all too complicated for me. Currently, I use CustomDraw below. However, it will change the background clolor for the "whole" row, which is not what I really want. In the code, indexVector is an vector variable in the Mydialog object used for indicating which row needs to change the background.
I would like to have a function that I can pass in the row and col and it change the background for that cell for me in the CListCtrl.
Thanks very much for any comments.

void Mydialog::OnCustomDrawList(NMHDR* pNMHDR, LRESULT* pResult) 
{
	//SAMPLE: for this notification, the structure is actually a
	// NMLVCUSTOMDRAW that tells you what's going on with the custom
	// draw action. So, we'll need to cast the generic pNMHDR pointer.
	LPNMLVCUSTOMDRAW  lplvcd = (LPNMLVCUSTOMDRAW)pNMHDR;
	//SAMPLE: The first notification we'll receive is CDDS_PREPAINT,
	// right at the beginning of the paint cycle. We'll want to return
	// item-specific notifications so we can deal with things the right
	// way.
	if (lplvcd->nmcd.dwDrawStage == CDDS_PREPAINT)
	{
		*pResult = CDRF_NOTIFYITEMDRAW;
	}
	// otherwise, we might be really getting a notification about
	// painting something.
	else if (lplvcd->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)
	// Because we returned CDRF_NOTIFYITEMDRAW in response to
    // CDDS_PREPAINT, CDDS_ITEMPREPAINT is sent when the control is
    // about to paint an item.
	{
		if (indexVector.at(lplvcd->nmcd.dwItemSpec) == 1 )
		{
            lplvcd->clrText = RGB(255, 0, 0);
            lplvcd->clrTextBk = RGB(0, 255, 255);
            *pResult = CDRF_NEWFONT;
		}
		else
		{
		// no change; tell the control to do the default
			*pResult = CDRF_DODEFAULT;
        }
	}
	else
	{
		*pResult = 0;
	}
}

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Question by:lily1102
2 Comments
 
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Accepted Solution

by:
Naveen_R earned 2000 total points
ID: 22793163
Currently in your code, you are handling CDDS_ITEMPREPAINT to draw the entrie row. But if you return CDRF_NOTIFYSUBITEMDRAW as a response to the CDDS_ITEMPREPAINT , the custome draw will get called before each column is draw. Below is the sample code. try it.
void Mydialog::OnCustomdraw(NMHDR* pNMHDR, LRESULT* pResult)
{
    NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>(pNMHDR);
    *pResult = CDRF_DODEFAULT;
    if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )	
    {
        *pResult = CDRF_NOTIFYITEMDRAW;
    }
    else if (pLVCD->nmcd.dwDrawStage == CDDS_ITEMPREPAINT )
    {
         *pResult = CDRF_NOTIFYSUBITEMDRAW;
    }
    else if (pLVCD->nmcd.dwDrawStage == (CDDS_ITEMPREPAINT | CDDS_SUBITEM))	
    {
        if( indexVector.at(pLVCD->nmcd.dwItemSpec) == 1 && 
            ( pLVCD->iSubItem == 3 || pLVCD->iSubItem == 4 ))
        {
          // All conditions met, chnage the color
           pLVCD->clrTextBk = RGB(0, 255, 255);
           pLVCD->clrText = RGB(255, 0, 0);
        }
        else
        {
           // Default color
           pLVCD->clrTextBk = RGB(255,255,255);
           pLVCD->clrText = RGB(0,0,0);
        }
    }
}

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Author Closing Comment

by:lily1102
ID: 31509327
Thanks so much for the wonderful solution that you provided. Super!!
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