ctreectrl checkbox改变事件

首先ctreectrl的checkbox属性需要用代码去设置

m_tree.ModifyStyle(0, TVS_CHECKBOXES);

 

checkbox改变事件也就是点击事件。

 

1 重载treectrl的OnNotify()

2 自定义一个消息，在这个消息的处理函数中，去做checkbox改变的响应。

 

OnNotify内容：

#define UM_CHECKSTATECHANGE (WM_USER + 19)
#define GET_X_LPARAM(lp) ((int)(short)LOWORD(lp))
#define GET_Y_LPARAM(lp) ((lp & 0xFFFF0000)>>16)

BOOL SomeDlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
    // TODO: Add your specialized code here and/or call the base class
    LPNMHDR lpnmh = (LPNMHDR) lParam;
    TVHITTESTINFO ht = {0};

    if((lpnmh->code == NM_CLICK) && (lpnmh->idFrom == IDC_TR_TBS))
    {
        DWORD dwpos = GetMessagePos();

        // include <windowsx.h> and <windows.h> header files
        ht.pt.x = GET_X_LPARAM(dwpos);
        ht.pt.y = GET_Y_LPARAM(dwpos);
        ::MapWindowPoints(HWND_DESKTOP, lpnmh->hwndFrom, &ht.pt, 1);

        TreeView_HitTest(lpnmh->hwndFrom, &ht);

        if(TVHT_ONITEMSTATEICON & ht.flags)
        {
            ::PostMessage(m_hWnd, UM_CHECKSTATECHANGE, 0, (LPARAM)ht.hItem);
        }
    }

    return CDialog::OnNotify(wParam, lParam, pResult);
}

 

处理的时候取得状态

 

HTREEITEM hItemChanged = (HTREEITEM)lParam;
    if(NULL == hItemChanged){ return -1;}
    BOOL checked = m_tbs.GetCheck(hItemChanged);
   ......
}