This article was previously published under Q141834
NOTE: Microsoft Visual C++ NET (2002) supported both the managed code
model that is provided by the .NET Framework and the unmanaged native Windows
code model. The information in this article applies to unmanaged Visual C++
code only.
When you initialize the CListCtrl by calling
CListCtrl::InsertItem(), you can pass in a value of I_IMAGECALLBACK for the
index of the image. This means that the system expects you to fill in the image
index when you get an LVN_GETDISPINFO notification. Inside of the handler for
LVN_GETDISPINFO, you can check if the item is selected and set the appropriate
image index.
BEGIN_MESSAGE_MAP(CTestView, CView)
//{{AFX_MSG_MAP(CTestView)
ON_WM_CREATE()
//}}AFX_MSG_MAP
ON_NOTIFY (LVN_GETDISPINFO, IDI_LIST, OnGetDispInfo)
END_MESSAGE_MAP()
int CTestView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;
// m_pImage is a CTestView's member variable of type CImageList*
// create the CImageList with 16x15 images
m_pImage = new CImageList();
VERIFY (m_pImage->Create (16, 15, TRUE, 0, 1));
CBitmap bm;
// IDR_MAINFRAME is the toolbar bitmap in a default AppWizard
// project.
bm.LoadBitmap (IDR_MAINFRAME);
// This will automatically parse the bitmap into nine images.
m_pImage->Add (&bm, RGB (192, 192, 192));
// m_pList is CTestView's member variable of type CListCtrl*
// create the CListCtrl.
m_pList = new CListCtrl();
VERIFY (m_pList->Create (WS_VISIBLE | WS_CHILD | LVS_REPORT |
LVS_EDITLABELS, CRect (0, 0, 400, 400), this, IDI_LIST));
// Create column.
m_pList->InsertColumn (0, "Button Number", LVCFMT_LEFT, 100);
// Associate CImageList with CListCtrl.
m_pList->SetImageList (m_pImage, LVSIL_SMALL);
char szTemp[10];
for (int iCntr = 0; iCntr < 9; iCntr++)
{
wsprintf (szTemp, "%d", iCntr);
m_pList->InsertItem (LVIF_IMAGE | LVIF_TEXT,
iCntr, szTemp, 0, 0, I_IMAGECALLBACK, 0L);
}
return 0;
}
void CTestView::OnGetDispInfo (NMHDR* pnmhdr, LRESULT* pResult)
{
LV_DISPINFO* pdi = (LV_DISPINFO *) pnmhdr;
// Fill in the LV_ITEM structure with the image info.
// When an item is selected, the image is set to the first
// image (the new bitmap on the toolbar).
// When it is not selected, the image index is equal to the
// item number (that is, 0=new, 1=open, 2=save, and so on.)
if (LVIS_SELECTED == m_pList->GetItemState (pdi->item.iItem,
LVIS_SELECTED))
pdi->item.iImage = 0;
else
pdi->item.iImage = pdi->item.iItem;
}
CTestView::~CTestView()
{
// Clean up.
delete m_pImage;
delete m_pList;
}
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