PRB: Use Masks to Set/Get Item States in CListCtrl

SYMPTOMS

Sample Code

   void CMyView::OnInitialUpdate()
   {
      CFormView::OnInitialUpdate();

      m_listCtrl.InsertColumn(0, "Western States", LVCFMT_LEFT, 150);

      LV_ITEM lvItem;
      ZeroMemory(&lvItem, sizeof(lvItem));
      lvItem.mask = LVIF_TEXT | LVIF_STATE;

      lvItem.iItem = 0;
      lvItem.state = LVIS_CUT | LVIS_SELECTED;
      lvItem.pszText = "Washington";
      m_listCtrl.InsertItem(&lvItem); // initially selected

      lvItem.iItem = 1;
      lvItem.state = LVIS_CUT | LVIS_SELECTED;
      lvItem.pszText = "Arizona";
      m_listCtrl.InsertItem(&lvItem); // initially selected

      lvItem.iItem = 2;
      lvItem.state = LVIS_CUT;
      lvItem.pszText = "Alaska";
      m_listCtrl.InsertItem(&lvItem);

      lvItem.iItem = 3;
      lvItem.state = LVIS_CUT;
      lvItem.pszText = "California";
      m_listCtrl.InsertItem(&lvItem);

      lvItem.iItem = 4;
      lvItem.state = LVIS_CUT;
      lvItem.pszText = "Nevada";
      m_listCtrl.InsertItem(&lvItem);

      UINT nState;
      CString strText;
      int iItem = -1;

      // as long as GetNextItem found an item...
      while ((iItem = m_listCtrl.GetNextItem(iItem, LVNI_ALL)) > -1 )
      {
         // get item string
         strText = m_listCtrl.GetItemText(iItem, 0);

         // show initial state of flags
         nState = m_listCtrl.GetItemState(iItem, LVIS_SELECTED | LVIS_CUT);
         TRACE("%s state flag is %0x\n", strText, nState);

         // Get only LVIS_SELECTED flag
         // note that LVIS_CUT is not returned in nState
         nState = m_listCtrl.GetItemState(iItem, LVIS_SELECTED);

         // select states beginning with 'A'
         if (strText[0] == 'A' && !nState) {
            TRACE("%s needed to be selected\n", strText);
            m_listCtrl.SetItemState(iItem,
               LVIS_SELECTED,  // nState
               LVIS_SELECTED); // nMask

         // deselect states that don't begin with 'A'
         } else if (strText[0] != 'A' && nState) {
            TRACE("%s needed to be deselected\n", strText);
            m_listCtrl.SetItemState(iItem,
               0,              // nState
               LVIS_SELECTED); // nMask
         }

         // show new flags if modified, note that LVIS_CUT wasn't affected
         nState = m_listCtrl.GetItemState(iItem, LVIS_SELECTED | LVIS_CUT);
         TRACE("%s state flag is now %0x\n", strText, nState);
      }
   }