CTreeCtrl基本使用

在OnInitDialog()函数中初始化CTreeCtrl

//初始化CTreeCtrl，为节点添加图片

//资源ID，显示的图标x轴像素，分组

m_pImage->Create(IDB_BITMAP1,24,2,RGB(255,255,255));

m_TreeCtrl.SetImageList(pImage,TVSIL_NORMAL);

//插入root节点

HTREEITEM hRoot = m_TreeCtrl.InsertItem(saValues1[0],0,0,TVI_ROOT,TVI_LAST);

m_TreeCtrl.SetItemData(hRoot,(DWORD)pmbgeo);

//插入叶节点

HTREEITEM ITEM = m_TreeCtrl.InsertItem(saValues2[0],2,2,hRoot,TVI_SORT);

m_TreeCtrl.SetItemData(ITEM,(DWORD)pgridgeo);

//展开节点

m_TreeCtrl.Expand(hRoot,TVE_EXPAND);

//显示第一个节点

HTREEITEM hItem = m_TreeCtrl.GetRootItem();

m_TreeCtrl.Select(hItem,TVGN_FIRSTVISIBLE);

//鼠标单击消息

OnClickTreeMaplist(NMHDR* pNMHDR, LRESULT* pResult)

{

BOOL bCheck ;

CPoint myPoint;

GetCursorPos(&myPoint) ;

m_TreeCtrl.ScreenToClient(&myPoint) ;

UINT uFlags;

//确定相对于工作区的树视图控件的指定点的位置

HTREEITEM hItem = m_TreeCtrl.HitTest(myPoint, &uFlags);

//获取复选框消息 -- TVHT_ONITEMSTATEICON
if (hItem  && (TVHT_ONITEMSTATEICON & uFlags))
{
    //子节点状态随父节点
    if (m_TreeCtrl.ItemHasChildren(hItem))  //父节点
    {   
        bCheck = m_TreeCtrl.GetCheck(hItem); //获取当前复选状态

        SetChildCheck(hItem,!bCheck); //设置子项复选状态
        {
            m_TreeCtrl.Expand(hItem,TVE_EXPAND);

            hItem = m_TreeCtrl.GetChildItem(hItem); //获取子项句柄

            while (hItem)
            {
                m_TreeCtrl.SetCheck(hItem, bCheck);
                SetChildCheck(hItem,bCheck); //递归调用
                hItem = m_TreeCtrl.GetNextSiblingItem(hItem); //获取兄弟的句柄

            }
        }

    }
    else
    {
        HTREEITEM hParent = m_TreeCtrl.GetParentItem(hItem);
        CString str = m_TreeCtrl.GetItemText(hParent);
        m_TreeCtrl.Select(hParent,TVGN_CARET);
    }
           

}

//获取鼠标点击的节点和图标的消息 — TVHT_ONITEMLABEL|TVHT_ONITEMICON

if (hItem && (TVHT_ONITEMLABEL|TVHT_ONITEMICON & uFlags))

{

…

}
//点击+-折叠展开树
if (hItem && (TVHT_ONITEMBUTTON & uFlags))
{
    //获取Ctrl键是否被按住
    short nState = GetKeyState(VK_CONTROL);
    if (nState == -127 || nState == -128)
    {
        UINT nItemExpand = m_TreeCtrl.GetItemState(hItem,TVIS_EXPANDED);
        if ((nItemExpand & TVIS_EXPANDED)!= TVIS_EXPANDED)  //树处于收缩状态
        {

            HTREEITEM hRoot = m_TreeCtrl.GetRootItem();
            while(hRoot)
            {
                if (hRoot == hItem)
                {
                    //不处理已经点击+-的节点
                    hRoot = m_TreeCtrl.GetNextItem(hRoot,TVGN_NEXT);
                    continue;
                }
                UINT nExpand = m_TreeCtrl.GetItemState(hRoot,TVIS_EXPANDED);
                //判断每个父节点的收缩状态
                if ((nExpand & TVIS_EXPANDED)!=TVIS_EXPANDED)
                {
                    m_TreeCtrl.Expand(hRoot,TVE_EXPAND);
                }
                hRoot = m_TreeCtrl.GetNextItem(hRoot,TVGN_NEXT);
            }

        }
        else    //处于展开状态
        {
            HTREEITEM hRoot = m_TreeCtrl.GetRootItem();
            while(hRoot)
            {
                if (hRoot == hItem)
                {
                    hRoot = m_TreeCtrl.GetNextItem(hRoot,TVGN_NEXT);
                    continue;
                }
                UINT nExpand = m_TreeCtrl.GetItemState(hRoot,TVIS_EXPANDED);
                if ((nExpand & TVIS_EXPANDED)==TVIS_EXPANDED)
                {
                    //收缩节点  TVE_COLLAPSE
                    m_TreeCtrl.Expand(hRoot,TVE_COLLAPSE);
                }

                hRoot = m_TreeCtrl.GetNextItem(hRoot,TVGN_NEXT);
            }
        }
        m_TreeCtrl.Select(hItem,TVGN_CARET);
    }   
}
           

}

//鼠标双击节点消息

OnDblclkTreeMaplist(NMHDR* pNMHDR, LRESULT* pResult)

{

//*pResult返回TRUE可以屏蔽双击展开节点操作

*pResult = TRUE;

}