PRB: Incorrect CListCtrl Painting During Label Editing

ID: Q149709

The information in this article applies to:

The Microsoft Foundation Classes (MFC), included with:
- Microsoft Visual C++, 32-bit Editions, versions 2.1, 2.2, 4.0, 4.1

SYMPTOMS

A label-editing enabled List View control with callback items (the application stores the text), may show selected items incorrectly highlighted when labels are edited in place. When label editing changes the length of the text, clearing the item selection and re-selecting it may cause the highlighted bar to span the length of the original text.

CAUSE

The functionality to show the highlighted bar resides in the List View control. In this case, the control does not calculate the new size of the highlighted bar for the edited label.

RESOLUTION

At the end of label editing, call the CListCtrl::SetItem function to make the control calculate the size of the just edited item. This function sets some or all of a list view item's attributes.

STATUS

This behavior is by design.

MORE INFORMATION

This problem can be seen in the MSDN sample, MFCLIST. The sample demonstrates a simple list view control implemented with MFC. Editing any of the "Address" column labels and changing the text length demonstrates the problem.

Sample Code

The following code demonstrates how to correct the behavior:


void CMyDialog::OnEndLabelEdit (NMHDR* pNMHDR, LRESULT* pResult)
{
    LV_DISPINFO* pLvdi = (LV_DISPINFO*)pNMHDR;

// The text is maintained by the application, so first update it

// Set up the item, to reset its text
    LV_ITEM lvi;
    lvi.mask = LVIF_TEXT;
    lvi.iItem=pLvdi->item.iItem;
    lvi.iSubItem = 0;
    lvi.pszText = LPSTR_TEXTCALLBACK;

// Call CListCtrl::SetItem, to force recalculation of the text length
    m_ListCtl.SetItem ( &lvi );

    *pResult = 0;
}

Additional query words: 2.10 2.20 3.10 3.20 4.00 4.10 LPSTR_TEXTCALLBACK edit highlight MFCList

Keywords : kbMFC KbUIDesign kbVC
Version : 2.10 2.20 4.00 4.10
Platform : NT WINDOWS
Issue type :