CTreeCtrl 父结点联动子结点CheckBox

来源：互联网发布：mac pkg系统盘安装包编辑：程序博客网时间：2024/04/30 10:18

来自http://www.cnblogs.com/chain2012/archive/2011/06/22/2086647.html

网上搜索了一番，发现没有一个符合我的要求的，于是自己写。

程序功能实现：在按下父结点的CheckBox后，其子结点全部跟随父结点的CheckBox属性设置。

实现步骤：

1.重载CTreeCtrl的单击事件

void CXMLTree::OnNMClickTree(NMHDR *pNMHDR, LRESULT *pResult){    NM_TREEVIEW* pHdr = (NM_TREEVIEW*)pNMHDR;    CPoint point;    UINT uFlag;    GetCursorPos(&point);    ScreenToClient(&point);    HTREEITEM hItem = m_TreeCtrl.HitTest(point, &uFlag);    if((hItem) && (TVHT_ONITEMSTATEICON & uFlag))       {           // 发送消息，在进行父节点和子节点关联之前判断CheckBox前后的状态        PostMessage(UM_CHECKSTATECHANGE, 0, (LPARAM)hItem);    }    else    {        *pResult = 0;    }}

2.重载双击时间，屏蔽掉因双击展开结点而改变CheckBox的状态

void CXMLTree::OnNMDblclkTree(NMHDR *pNMHDR, LRESULT *pResult){          *pResult = TRUE;}

3.写自己Post的Message函数

#define UM_CHECKSTATECHANGE (WM_USER + 100)//Message Map里面加这句ON_MESSAGE(UM_CHECKSTATECHANGE, &CXMLTree::OnMyMessage)afx_msg LRESULT CXMLTree::OnMyMessage(WPARAM wParam, LPARAM lParam){    HTREEITEM hItem = (HTREEITEM)lParam;    DWORD data = m_TreeCtrl.GetItemData(hItem);    BOOL bCheck = m_TreeCtrl.GetCheck(hItem);    CString cStrTemp = m_TreeCtrl.GetItemText(hItem);    //AfxMessageBox(cStrTemp);    if(data==1 && !bCheck)     {        //AfxMessageBox(_T("Check状态从check到uncheck"));        //SetChildCheck(hItem, 0);         SetParentChildNodeCheck(hItem, 0);  //按下CheckBox后触发的动作        m_TreeCtrl.SetItemData(hItem, 0);    }    if(data==0 && bCheck) {        //AfxMessageBox(_T("Check状态从uncheck到check"));        //SetChildCheck(hItem, 1);         SetParentChildNodeCheck(hItem, 1); //按下CheckBox后触发的动作        m_TreeCtrl.SetItemData(hItem, 1);    }    return 0L;}

4.写递归函数，实现父结点关联子结点

BOOL CXMLTree::SetParentChildNodeCheck(HTREEITEM hItem, BOOL bCheck){    if (hItem==NULL)        return FALSE;    HTREEITEM hChild = m_TreeCtrl.GetChildItem(hItem);    SetChildCheck(hChild, bCheck);     m_TreeCtrl.SetCheck(hItem, bCheck);    return TRUE;}//递归函数void CXMLTree::SetChildCheck(HTREEITEM hItem, BOOL bCheck){    if (hItem == NULL) return;    m_TreeCtrl.SetCheck(hItem, bCheck);     HTREEITEM hSibling = m_TreeCtrl.GetNextItem(hItem, TVGN_NEXT);    while (hSibling)    {        m_TreeCtrl.SetCheck(hSibling, bCheck);         HTREEITEM hSibChild = m_TreeCtrl.GetChildItem(hSibling);        if (hSibChild)        {            SetChildCheck(hSibChild, bCheck);        }        hSibling = m_TreeCtrl.GetNextItem(hSibling, TVGN_NEXT);    }    HTREEITEM hChild = m_TreeCtrl.GetChildItem(hItem);    if (hChild!=NULL)    {        SetChildCheck(hChild, bCheck);    }}

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