MFC對話框響應ON_UPDATE_COMMAND_UI事件

本文轉載自查看原文 2012-11-28 20:25 7727 VC++

以對話框為父窗口創建的菜單，菜單響應函數可以寫在對話框類中。

菜單響應函數的映射和普通菜單響應映射一樣。

但是菜單狀態更新命令，需要特殊處理。

BEGIN_MESSAGE_MAP(CDlg, CDialogEx)
    ON_WM_INITMENU()
    ON_WM_INITMENUPOPUP()
     // 大氣象
    ON_UPDATE_COMMAND_UI_RANGE( 1001, 1002,&OnMenuItemUI)
END_MESSAGE_MAP()

// 設置Check或Enable
void CDlg::OnMenuItemUI(CCmdUI *pCmdUI)
{
     if (pCmdUI->m_nID == 1001)
    {
        pCmdUI->SetCheck( 1);
    }
     if (pCmdUI->m_nID == 1002)
    {
        pCmdUI->Enable(FALSE);
    }
}

BOOL CDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

     // TODO:  在此添加額外的初始化
    CMenu menuMain;
    menuMain.CreateMenu();

    CMenu menuChild;
    menuChild.CreatePopupMenu();
    menuChild.AppendMenu(MF_STRING, 1001, " menu1 ");
    menuChild.AppendMenu(MF_STRING, 1002, " menu2 ");

    menuMain.AppendMenu(MF_POPUP,(UINT)menuChild.Detach(), " menu0 ");

    SetMenu(&menuMain);
    menuMain.Detach();

     return TRUE;   // return TRUE unless you set the focus to a control
     // 異常: OCX 屬性頁應返回 FALSE
}
// 大氣象：需要在這里做特殊處理。
void CDlg::OnInitMenuPopup(CMenu* pPopupMenu, UINT nIndex, BOOL bSysMenu)
{
    CDialogEx::OnInitMenuPopup(pPopupMenu, nIndex, bSysMenu);

     // TODO: 在此處添加消息處理程序代碼
    CCmdUI state;
    state.m_pMenu = pPopupMenu;
    ASSERT(state.m_pOther == NULL);
    ASSERT(state.m_pParentMenu == NULL);

     // Determine if menu is popup in top-level menu and set m_pOther to
     // it if so (m_pParentMenu == NULL indicates that it is secondary popup).
    HMENU hParentMenu;
     if (AfxGetThreadState()->m_hTrackingMenu == pPopupMenu->m_hMenu)
        state.m_pParentMenu = pPopupMenu;     // Parent == child for tracking popup.
     else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
    {
        CWnd* pParent = this;
         // Child windows don't have menus--need to go to the top!
         if (pParent != NULL &&
            (hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL)
        {
             int nIndexMax = ::GetMenuItemCount(hParentMenu);
             for ( int nIndex = 0; nIndex < nIndexMax; nIndex++)
            {
                 if (::GetSubMenu(hParentMenu, nIndex) == pPopupMenu->m_hMenu)
                {
                     // When popup is found, m_pParentMenu is containing menu.
                    state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
                     break;
                }
            }
        }
    }

    state.m_nIndexMax = pPopupMenu->GetMenuItemCount();
     for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax;
        state.m_nIndex++)
    {
        state.m_nID = pPopupMenu->GetMenuItemID(state.m_nIndex);
         if (state.m_nID == 0)
             continue; // Menu separator or invalid cmd - ignore it.

        ASSERT(state.m_pOther == NULL);
        ASSERT(state.m_pMenu != NULL);
         if (state.m_nID == (UINT)- 1)
        {
             // Possibly a popup menu, route to first item of that popup.
            state.m_pSubMenu = pPopupMenu->GetSubMenu(state.m_nIndex);
             if (state.m_pSubMenu == NULL ||
                (state.m_nID = state.m_pSubMenu->GetMenuItemID( 0)) == 0 ||
                state.m_nID == (UINT)- 1)
            {
                 continue;        // First item of popup can't be routed to.
            }
            state.DoUpdate( this, TRUE);    // Popups are never auto disabled.
        }
         else
        {
             // Normal menu item.
             // Auto enable/disable if frame window has m_bAutoMenuEnable
             // set and command is _not_ a system command.
            state.m_pSubMenu = NULL;
            state.DoUpdate( this, FALSE);
        }

         // Adjust for menu deletions and additions.
        UINT nCount = pPopupMenu->GetMenuItemCount();
         if (nCount < state.m_nIndexMax)
        {
            state.m_nIndex -= (state.m_nIndexMax - nCount);
             while (state.m_nIndex < nCount &&
                pPopupMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
            {
                state.m_nIndex++;
            }
        }
        state.m_nIndexMax = nCount;
    }
}
// 大氣象：注意不是這里
void CDlg::OnInitMenu(CMenu* pMenu)
{
    CDialogEx::OnInitMenu(pMenu);

     // TODO: 在此處添加消息處理程序代碼
}

對話框里創建的菜單，響應函數可以寫在其他類。
需要源碼的，留下郵箱索取。
url: http://greatverve.cnblogs.com/archive/2012/11/28/dlg-on-update-command-ui.html
參考：
http://support.microsoft.com/kb/242577/zh-cn
http://greatverve.cnblogs.com/archive/2012/11/21/mfc-dlg-menu-cmd.html

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