树形控件(Tree Control)

[cpp]
///"添加"按钮的响应函数
void CTreeCtrlDemoDlg::OnBtnAdd()
{
    // TODO: Add your control notification handler code here
    ///获取用户的输入
    CString strText;
    GetDlgItemText(IDC_EDT_TEXT, strText);
    if(strText.GetLength() == 0)
    {
        AfxMessageBox(_T("请输入文本!"));
        return ;
    }
    ///获取当前所选结点
    HTREEITEM hItem = m_tree.GetSelectedItem();
    ///如果当前没有选中节点，则添加根节点
    if(hItem== NULL)
    {
        hItem = TVI_ROOT;
    }

    ///节点数据
    TVINSERTSTRUCT ts = {0};
    //新节点的父节点
    ts.hParent = hItem;
    ///新节点添加在同级节点最后
    ts.hInsertAfter = TVI_LAST;
    ///新节点的文本
    ts.item.pszText = (LPTSTR)(LPCTSTR)strText;
    ///让文本成员有效
    ts.item.mask = TVIF_TEXT;
    ///添加新节点
    HTREEITEM hNewItem = m_tree.InsertItem(&ts);

    ///选中新节点
    m_tree.SelectItem(hNewItem);
    ///确保新节点在可视范围内
    m_tree.EnsureVisible(hNewItem);
}

///"删除"按钮的响应函数

void CTreeCtrlDemoDlg::OnBtnDelete()
{
    // TODO: Add your control notification handler code here
    ///获取当前所选结点
    HTREEITEM hItem = m_tree.GetSelectedItem();

    if(hItem ==NULL)
    {
        AfxMessageBox(_T("请选择一个结点!"));
        return ;
    }

    //取得当前结点的父节点
    HTREEITEM hParent = m_tree.GetParentItem(hItem);
    ///删除结点
    m_tree.DeleteItem(hItem);
    ///选中其父节点
    m_tree.SelectItem(hParent);
}

///"修改"按钮的消息响应函数

void CTreeCtrlDemoDlg::OnBtnEdit()
{
    // TODO: Add your control notification handler code here
    ///获取当前选中的结点
    HTREEITEM hItem = m_tree.GetSelectedItem();
    if(hItem == NULL)
    {
        AfxMessageBox(_T("请选择一个节点!"));
        return ;
    }
    ///获取用户的输入
    CString strText;
    GetDlgItemText(IDC_EDT_TEXT , strText);
    if(strText.GetLength() == 0)
    {
        AfxMessageBox(_T("请输入文本!"));
        return ;
    }
    ///修改结点文本
    m_tree.SetItemText(hItem,strText);
}

///树形控件“TVN_SELCHANGEED”通知消息的响应函数
///控件当前结点改变时的消息处理

void CTreeCtrlDemoDlg::OnSelchangedTree(NMHDR* pNMHDR, LRESULT* pResult)
{
    NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
    // TODO: Add your control notification handler code here
    ///获取当前所选结点
    HTREEITEM hItem = m_tree.GetSelectedItem();
    if(hItem != NULL)
    {
        ///获取结点文本
        CString strText= m_tree.GetItemText(hItem);
        ///将结点文本显示在文本框中
        SetDlgItemText(IDC_EDT_TEXT , strText);
    }
    *pResult = 0;
}

界面解释：
树形控件ID为IDC_TREE，关联变量m_tree ,选中style:has buttons 、has lines 、lines at root 、show selection always；
按钮ID为IDC_BTN_ADD、IDC_BTN_EDIT、 IDC_BTN_DELETE
文本框ID为IDC_EDT_TEXT

补充：软件开发 , C++ ,