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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
 
LVL 3

Accepted Solution

by:
Naveen_R earned 500 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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