在ListCtrl中将多选框变为单选框的方法

来源：互联网发布：linux expect spawn 编辑：程序博客网时间：2024/05/17 23:04

在ListCtrl中将多选框变为单选框的方法:

假定ID为IDC_LIST1
增加:
ON_NOTIFY(LVN_ITEMCHANGED, IDC_LIST1, OnItemchangedList1)

函数实现:
void CTestDlg::OnItemchangedList1(NMHDR* pNMHDR, LRESULT* pResult)
{
    NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
    // TODO: Add your control notification handler code here
    *pResult = 0;

    static int lSelectItem=-1;
    if (pNMListView->uOldState == 0 && pNMListView->uNewState == 0)
        return;    // No change

    BOOL bPrevState = (BOOL)(((pNMListView->uOldState &
        LVIS_STATEIMAGEMASK)>>12)-1);   // Old check box state
    if (bPrevState < 0)    // On startup there's no previous state
        bPrevState = 0; // so assign as false (unchecked)

    // New check box state
    BOOL bChecked=(BOOL)(((pNMListView->uNewState & LVIS_STATEIMAGEMASK)>>12)-1);
    if (bChecked < 0) // On non-checkbox notifications assume false
        bChecked = 0;

    if (bPrevState == bChecked) // No change in check box
        return;

    if(bChecked)
    {
        if(lSelectItem!=-1)
        {
            //already checked, reset the last checked item
            m_list.SetCheck(lSelectItem,FALSE);
        }
        lSelectItem=pNMListView->iItem;
    }
    else
    {
        //UnCheck,reset lSelectItem
        lSelectItem=-1;
    }
}