如何使弹出式菜单项中的弹出式菜单项变灰？

mhj1232 2009-09-08 04:40:26

我建了个菜单，在菜单栏下还有一个弹出式菜单，该弹出式菜单有两个菜单项，我用了以下方法都无法使这两个菜单项变灰。
1.GetMenu()->GetSubMenu(2)->GetSubMenu(0)->EnableMenuItem(0,MF_GRAYED|MF_BYPOSITION)；该方法Debug错误
2.GetMenu()->GetSubMenu(2)->EnableMenuItem(菜单ID,MF_GRAYED|MF_BYPOSITION)；无反应

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beniii011 2010-03-18

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xiexie ,i would like to see the solution.

mhj1232 2009-09-08

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有必要搞那么复杂吗？

yuhudie203 2009-09-08

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基于对话框的要添加相应的代码



相应 OnInitMenuPopup虚函数

virtual void OnInitMenuPopup(CMenu* pPopupMenu, UINT nIndex, BOOL bSysMenu);

然后添加如下代码

void CDrawRate::OnInitMenuPopup(CMenu* pPopupMenu, UINT nIndex, BOOL bSysMenu) 

{

    ASSERT(pPopupMenu != NULL);

    // Check the enabled state of various menu items.

	

    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;

	}

}