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Checkboxes in CListCtrl via StateImages

Posted on 1997-11-05
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Last Modified: 2013-11-20
I'm looking for a solution:
I intend to implement a CListCtrl (Reportstyle) with Checkboxes at the head of each line (like CCheckBox).
I've created two state icons (checked, unchecked). But the problem that occured was that if I try to click on the checkbox nothing changed respectively the state of another line which was selected changed. Furthermore I don't only want to change thy state but to open an dialog at a double click to get more information from the user.
Thus my accurate questions:
- How can I include the checkbox range into the selection?
- How can I change the state of the checkbox by a single click on the checkbox field (like the CListBox behaviour)?
- How can I effectively open an dialog by a double click (Override WM_...)?
- How can I simply implement a functionality for exchanging two lines? I've tried this but every time the selection of the line I wanted to go down or up was gone.

I would be very grateful if if you could could show me the source code for a 3 row Control like discribed above.
Thank in advance.
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Question by:trouvain
3 Comments
 
LVL 8

Expert Comment

by:gelbert
ID: 1309387
Take a look at samples\mfc\general\rowlist. To open dialog overide handle of WM_LBUTTONDBLCLK in your CListCtrl derived class and create and open dialog inside this function.
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LVL 10

Accepted Solution

by:
RONSLOW earned 200 total points
ID: 1309388
I have code that does all this for a list control

Probably a bit much to put up in detail here.

To add checkboxes...

void CMyListCtrl::AddExStyle(DWORD dwNewStyle) {
      DWORD dwStyle = GetExStyle();
      dwStyle |= dwNewStyle;
      SetExStyle(dwStyle);
}

void CMyListCtrl::RemoveExStyle(DWORD dwDelStyle) {
      DWORD dwStyle = GetExStyle();
      dwStyle &= ~dwDelStyle;
      SetExStyle(dwStyle);
}

void CMyListCtrl::EnableCheckboxes(bool enable) {
      if (enable) {
            AddExStyle(LVS_EX_CHECKBOXES);
      } else {
            RemoveExStyle(LVS_EX_CHECKBOXES);
      }
}

To detect a checkbox change...

void CMyListCtrl::OnItemchanged(NMHDR* pNMHDR, LRESULT* pResult) {
      NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
      UINT changes = (pNMListView->uNewState)^(pNMListView->uOldState);
      if (changes & LVIS_STATEIMAGEMASK) {
            UINT checkstate = ((pNMListView->uNewState&LVIS_STATEIMAGEMASK) >> 12)-1;
            CheckStateChanged(pNMListView->lParam,checkstate);
      }
      *pResult = true;
}

where CheckStateChanged is a member function that gets called whenever a check state is changed

for double click...

ON_NOTIFY_REFLECT(NM_DBLCLK, OnDblclk)

int CMyListCtrl::HitTestMessage() const {
      const MSG * pMsg = GetCurrentMessage();
      CPoint pt = pMsg->pt;
      ScreenToClient(&pt);
      return HitTest(pt);
}

void CMyListCtrl::OnDblclk(NMHDR* /*pNMHDR*/, LRESULT* pResult) {
      m_clickitem = -1;
      int item = HitTestMessage(&col,NULL,&flag);
      if (item >= 0) {
            // handle double click (eg call dialog)
      }
      *pResult = 0;
}

exchanging two lines looses selection...

void CMyListCtrl::PreSubclassWindow() {
      CListCtrl::PreSubclassWindow();
      // .. other stuff
      ModifyStyle(0,LVS_SHOWSELALWAYS);
}

Hope this helps.

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Author Comment

by:trouvain
ID: 1309389
Thsnx but you could be more specific
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