Re: Question about CListCtrl extended style - LVS_EX_CHECKBOXES

This worked for me. Here is what it does, when you select an item that is
not check it will check it. When you unselect an item that is checked it
will uncheck it. when you check an item that is not check it will select it,
and when you uncheck an item that is checked it will also unselect the item.
You have to use Ctrl or Shift keys to multiple select the items.

h file of the CListCtrl class
#pragma once

// CCheckListControl

class CCheckListControl : public CListCtrl
{
 DECLARE_DYNAMIC(CCheckListControl)

public:
 CCheckListControl();
 virtual ~CCheckListControl();

protected:
  afx_msg void OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult);
  DECLARE_MESSAGE_MAP()
private:
   BOOL m_InChange;
};

cpp file of the CListCtrl class
// CheckListControl.cpp : implementation file
//

#include "stdafx.h"
#include "CheckListControl.h"
#include "afxtempl.h"

// CCheckListControl

IMPLEMENT_DYNAMIC(CCheckListControl, CListCtrl)
CCheckListControl::CCheckListControl()
: m_InChange(FALSE)
{
}

CCheckListControl::~CCheckListControl()
{
}

BEGIN_MESSAGE_MAP(CCheckListControl, CListCtrl)
   ON_NOTIFY_REFLECT(LVN_ITEMCHANGED, OnLvnItemchanged)
END_MESSAGE_MAP()

// CCheckListControl message handlers

void CCheckListControl::OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult)
{
   if (m_InChange)
   {
      return;
   }

   m_InChange = TRUE;

   LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
   // TODO: Add your control notification handler code here
   *pResult = 0;

   if (((pNMLV->uChanged & LVIF_STATE) == LVIF_STATE) && (pNMLV->uNewState &
LVIS_SELECTED) == LVIS_SELECTED)
   {
      SetCheck(pNMLV->iItem);
   }
   else if (((pNMLV->uChanged & LVIF_STATE) == LVIF_STATE) &&
pNMLV->uNewState == 0)
   {
      if (GetItemState(pNMLV->iItem,LVIS_SELECTED) == 0)
      {
         SetCheck(pNMLV->iItem,0);
      }
   }
   else
   {
      SetItemState(pNMLV->iItem,GetCheck(pNMLV->iItem) ? LVIS_SELECTED :
0,LVIS_SELECTED);
   }
   m_InChange = FALSE;
}

AliR.

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