帶複選框的CTreeCtrl響應複選消息

1.在對話框中添加CTreeCtrl控件並勾選Check Boxes選項,爲CTreeCtrl控件添加CTreeCtrl變量m_tree;

2.爲CTreeCtrl控件添加NM_CLICK消息響應函數OnClickTree();代碼以下:

OnClickTree(NMHDR* pNMHDR, LRESULT* pResult) 

{
    CPoint point;
    UINT uFlag;   //接收有關點擊測試的信息的整數
    HTREEITEM hTree;
    BOOL bCheck;
    GetCursorPos(&point);    //獲取屏幕鼠標座標
    m_tree.ScreenToClient(&point);           //轉化成客戶座標
    hTree = m_tree.HitTest(point,&uFlag);    //返回與CtreeCtrl關聯的光標的當前位置和句柄

    if (hTree && (TVHT_ONITEMSTATEICON & uFlag))  //點中複選框
     {

          bCheck = m_treeSsid.GetCheck(hTree);      //獲取當前複選狀態
          SetChildCheck(hTree,!bCheck);                  //設置子項複選狀態
      }
 
     *pResult = 0;
}

3.SetChildCheck()函數爲自定義的處理函數(響應點擊複選框後的具體處理函數):

下面的函數功能爲:父項選中或取消選中,子項跟住選中或取消選中;

SetChildCheck(HTREEITEM hTree,BOOL bCheck)
{
  hTree = m_tree.GetChildItem(hTree);  //獲取子項句柄
  while (hTree)
  {

      m_tree.SetCheck(hTree, bCheck);
      SetChildCheck(hTree,bCheck);     //遞歸調用
      hTree = m_tree.GetNextSiblingItem(hTree);    //獲取兄弟的句柄
  }
 }

4.總結:關鍵是TVHT_ONITEMSTATEICON,它標誌鼠標點擊的是樹形控件的複選框;