超级复杂的写法（ 动态设置菜单项为灰色）

[zrdongjiao]

动态设置菜单项为灰色


on_upate_command_ui 里难道不可以吗？

比如可以这样处理：

pCmdUI->Enable(FALSE); //就可以禁止菜单， 让其为灰色了。



网上的代码居然搞了那么复杂，看个例子：


OnInitMenuPopup(CMenu* pMenu, UINT nIndex, BOOL bSysMenu)
{
if (bSysMenu)
return; // don't support system menu

ASSERT(pMenu != NULL);

// check the enabled state of various menu items

CCmdUI state;
state.m_pMenu = pMenu;
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 == pMenu->m_hMenu)
state.m_pParentMenu = pMenu; // parent == child for tracking popup
else if ((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
{
CWnd* pParent = GetTopLevelParent();
// 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) == pMenu->m_hMenu)
{
// when popup is found, m_pParentMenu is containing menu
state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
break;
}
}
}
}

state.m_nIndexMax = pMenu->GetMenuItemCount();
for (state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax;
state.m_nIndex++)
{
state.m_nID = pMenu->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 = pMenu->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, FALSE); // 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, state.m_nID < 0xF000);
}

// adjust for menu deletions and additions
UINT nCount = pMenu->GetMenuItemCount();
if (nCount < state.m_nIndexMax)
{
state.m_nIndex -= (state.m_nIndexMax - nCount);
while (state.m_nIndex < nCount &&
pMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
{
state.m_nIndex++;
}
}
state.m_nIndexMax = nCount;
}
}


真是无语至极

[shen_wei]

实现方式不一样。。下面那个更通用，传递CMenu，就可以随便禁用。。 楼主的方式也可以，但是菜单N多就是个问题。。相互关联的菜单项更麻烦

[yaozhiyong110]

你那个是禁止整个菜单的吧 下面的可以控制每一项

[zrdongjiao]

引用 2 楼 yaozhiyong110 的回复:

你那个是禁止整个菜单的吧 下面的可以控制每一项

引用 2 楼 yaozhiyong110 的回复:

你那个是禁止整个菜单的吧 下面的可以控制每一项

我的咋是 禁止整个菜单了？ 一个menu item 对应一个 on_update_command_ui 自然就说明我的法子是： 只禁止menu item