学习：Tree Control

Posted 2021-03-11 zpchcbd

/*
D:Visual_Studio_reposMFC7*/

/*插入*/
void CMy7Dlg::OnBnClickedButton1()
{
    /*
        逻辑顺序：
        1、利用GetSelectedItem函数获取被选中的节点
        2、if判断是否有节点选中，如果没有的话创建一个HTREEITEM结构体作为节点进行插入
        3、插入的顺序为 hInsertAfter = TVI_LAST，节点的名称为EDIT控件的名称
        4、进行插入InsertItem 返回一个新节点的句柄
        5、插入成功后，默认选中插入的节点
    */
    CString mString;
    GetDlgItemText(IDC_EDIT1,mString);
    HTREEITEM hTree = m_tree_1.GetSelectedItem();
    if (hTree == NULL) {
        hTree = TVI_ROOT;
    }

    TVINSERTSTRUCT tv = { 0 };
    tv.hParent = hTree;
    tv.hInsertAfter = TVI_LAST;
    tv.item.pszText = mString.GetBuffer(); //获取Cstring的字符串的指针
    tv.item.mask = TVIF_TEXT;
    HTREEITEM NewTree = m_tree_1.InsertItem(&tv); // 插入节点
    m_tree_1.SelectItem(NewTree); //插入后 再进行默认选中
}


/*修改*/
void CMy7Dlg::OnBnClickedButton2()
{
    CString mString;
    CString TreeName;
    GetDlgItemText(IDC_EDIT1, mString);
    HTREEITEM hTree = m_tree_1.GetSelectedItem();
    m_tree_1.SetItemText(hTree, mString.GetBuffer());

}


void CMy7Dlg::OnBnClickedButton3()
{
    HTREEITEM hTree = m_tree_1.GetSelectedItem();
    m_tree_1.DeleteItem(hTree);
}

/*实时EDIT节点名*/
void CMy7Dlg::OnTvnSelchangedTree1(NMHDR *pNMHDR, LRESULT *pResult)
{
    LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);
    
    CString mString;
    HTREEITEM hTree = m_tree_1.GetSelectedItem();
    mString = m_tree_1.GetItemText(hTree);
    SetDlgItemText(IDC_EDIT1, mString);
    *pResult = 0;
}