VC++ CTreeCtrl 使用NM_CLICK和TVN_SELCHANGED

//这是当CTREECTRL控件点击时NM_CLICK的处理函数

void CDriverSelCtrl::OnNMClick(NMHDR *pNMHDR, LRESULT *pResult)
{
    CPoint curPoint;
    UINT nFlags;
    HTREEITEM hItem;

    GetCursorPos(&curPoint); //当前点坐标
    ScreenToClient(&curPoint); //屏幕坐标转换为TREE内坐标
    hItem = HitTest(curPoint, &nFlags); //坐标是否有ITEM

    if (hItem && (TVHT_ONITEM & nFlags)) //判断是否有HTREEITEM
    {
        this->SelectItem(hItem);//在这里处理点击后的结果
    }

   // TODO:  在此添加控件通知处理程序代码
    *pResult = 0;
}

在这里需要指出 HitTest 函数不但可以检测出是否在item上 也可以检测出 位于 item项的 哪个位置请看 MSDN的说明

Value	Meaning
TVHT_ABOVE	Above the client area.
TVHT_BELOW	Below the client area.
TVHT_NOWHERE	In the client area, but below the last item.
TVHT_ONITEM	On the bitmap or label associated with an item.
TVHT_ONITEMBUTTON	On the button associated with an item.
TVHT_ONITEMICON	On the bitmap associated with an item.
TVHT_ONITEMINDENT	In the indentation associated with an item.
TVHT_ONITEMLABEL	On the label (string) associated with an item.
TVHT_ONITEMRIGHT	In the area to the right of an item.
TVHT_ONITEMSTATEICON	On the state icon for a tree-view item that is in a user-defined state.
TVHT_TOLEFT	To the left of the client area.
TVHT_TORIGHT	To the right of the client area.

由此可以更加灵活的使用的CTREECTL控件了

例如下面 例子:

void CDriverSelCtrl::OnNMClick(NMHDR *pNMHDR, LRESULT *pResult)
{
    CPoint point;
    UINT uFlag;
    BOOL bCheck;


    GetCursorPos(&point);
    CTreeCtrl::ScreenToClient(&point);
    HTREEITEM hTree = CTreeCtrl::HitTest(point, &uFlag);

if (hTree && (TVHT_ONITEMSTATEICON & uFlag))
    {
        CTreeCtrl::SelectItem(hTree);
        bCheck = CTreeCtrl::GetCheck(hTree);

        
    }


    // TODO:  在此添加控件通知处理程序代码
    *pResult = 0;
}

 下面是关于 选项改变时的函数

//这是当控件的选择发生变化时的处理函数
void CDriverSelCtrl::OnTvnSelchanged(NMHDR *pNMHDR, LRESULT *pResult)
{    

LPNMTREEVIEW pNMTreeView = reinterpret_cast<LPNMTREEVIEW>(pNMHDR);
pNMTreeView->itemNew //选中HTREEITEM
pNMTreeView->itemOld //上次选中HTREEITEM
// TODO:  在此添加控件通知处理程序代码
*pResult = 0;
}