src/mac/menu.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        menu.cpp
// Purpose:     wxMenu, wxMenuBar, wxMenuItem
// Author:      Stefan Csomor
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id$
// Copyright:   (c) Stefan Csomor
// Licence:       wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "menu.h"
#pragma implementation "menuitem.h"
#endif

// ============================================================================
// headers & declarations
// ============================================================================

// wxWindows headers
// -----------------

#include "wx/app.h"
#include "wx/menu.h"
#include "wx/menuitem.h"
#include "wx/window.h"
#include "wx/log.h"
#include "wx/utils.h"
#include "wx/frame.h"

#include "wx/mac/uma.h"

// other standard headers
// ----------------------
#include <string.h>

#if !USE_SHARED_LIBRARY
IMPLEMENT_DYNAMIC_CLASS(wxMenu, wxEvtHandler)
IMPLEMENT_DYNAMIC_CLASS(wxMenuBar, wxEvtHandler)
#endif

// the (popup) menu title has this special id
static const int idMenuTitle = -2;
static MenuItemIndex firstUserHelpMenuItem = 0 ;

const short kwxMacMenuBarResource = 1 ;
const short kwxMacAppleMenuId = 1 ;

// ============================================================================
// implementation
// ============================================================================
static void wxMenubarUnsetInvokingWindow( wxMenu *menu ) ;
static void wxMenubarSetInvokingWindow( wxMenu *menu, wxWindow *win );

// Menus

// Construct a menu with optional title (then use append)

#ifdef __DARWIN__
short wxMenu::s_macNextMenuId = 3 ;
#else
short wxMenu::s_macNextMenuId = 2 ;
#endif

void wxMenu::Init()
{
    m_doBreak = FALSE;
    m_startRadioGroup = -1;

    // create the menu
    m_macMenuId = s_macNextMenuId++;
    m_hMenu = UMANewMenu(m_macMenuId, m_title);

    if ( !m_hMenu )
    {
        wxLogLastError("UMANewMenu failed");
    }

    // if we have a title, insert it in the beginning of the menu
    if ( !!m_title )
    {
        Append(idMenuTitle, m_title) ;
        AppendSeparator() ;
    }
}

wxMenu::~wxMenu()
{
    if (MAC_WXHMENU(m_hMenu))
        ::DisposeMenu(MAC_WXHMENU(m_hMenu));
}

void wxMenu::Break()
{
    // not available on the mac platform
}

void wxMenu::Attach(wxMenuBarBase *menubar)
{
    wxMenuBase::Attach(menubar);

    EndRadioGroup();
}

// function appends a new item or submenu to the menu
// append a new item or submenu to the menu
bool wxMenu::DoInsertOrAppend(wxMenuItem *pItem, size_t pos)
{
    wxASSERT_MSG( pItem != NULL, wxT("can't append NULL item to the menu") );

    if ( pItem->IsSeparator() )
    {
        if ( pos == (size_t)-1 )
            MacAppendMenu(MAC_WXHMENU(m_hMenu), "\p-");
        else
            MacInsertMenuItem(MAC_WXHMENU(m_hMenu), "\p-" , pos);
    }
    else
    {
        wxMenu *pSubMenu = pItem->GetSubMenu() ;
        if ( pSubMenu != NULL )
        {
               wxASSERT_MSG( pSubMenu->m_hMenu != NULL , wxT("invalid submenu added"));
            pSubMenu->m_menuParent = this ;

            if (wxMenuBar::MacGetInstalledMenuBar() == m_menuBar)
            {
                pSubMenu->MacBeforeDisplay( true ) ;
             }

            if ( pos == (size_t)-1 )
                UMAAppendSubMenuItem(MAC_WXHMENU(m_hMenu), pItem->GetText(), pSubMenu->m_macMenuId);
            else
                UMAInsertSubMenuItem(MAC_WXHMENU(m_hMenu), pItem->GetText() , pos, pSubMenu->m_macMenuId);
            pItem->UpdateItemBitmap() ;
            pItem->UpdateItemStatus() ;
        }
        else
        {
            if ( pos == (size_t)-1 )
            {
                UMAAppendMenuItem(MAC_WXHMENU(m_hMenu), wxT("a") );
                pos = CountMenuItems(MAC_WXHMENU(m_hMenu)) ;
            }
            else
            {
                // MacOS counts menu items from 1 and inserts after, therefore having the
                // same effect as wx 0 based and inserting before, we must correct pos
                // after however for updates to be correct
                UMAInsertMenuItem(MAC_WXHMENU(m_hMenu), wxT("a") , pos);
                pos += 1 ;
            }

            SetMenuItemCommandID( MAC_WXHMENU(m_hMenu) , pos , pItem->GetId() ) ;
            pItem->UpdateItemText() ;
            pItem->UpdateItemBitmap() ;
            pItem->UpdateItemStatus() ;

              if ( pItem->GetId() == idMenuTitle )
              {
                UMAEnableMenuItem(MAC_WXHMENU(m_hMenu) , pos , false ) ;
              }
        }
    }
    // if we're already attached to the menubar, we must update it
    if ( IsAttached() )
    {
        m_menuBar->Refresh();
    }
    return TRUE ;
}

void wxMenu::EndRadioGroup()
{
    // we're not inside a radio group any longer
    m_startRadioGroup = -1;
}

bool wxMenu::DoAppend(wxMenuItem *item)
{
    wxCHECK_MSG( item, FALSE, _T("NULL item in wxMenu::DoAppend") );

    bool check = FALSE;

    if ( item->GetKind() == wxITEM_RADIO )
    {
        int count = GetMenuItemCount();

        if ( m_startRadioGroup == -1 )
        {
            // start a new radio group
            m_startRadioGroup = count;

            // for now it has just one element
            item->SetAsRadioGroupStart();
            item->SetRadioGroupEnd(m_startRadioGroup);

            // ensure that we have a checked item in the radio group
            check = TRUE;
        }
        else // extend the current radio group
        {
            // we need to update its end item
            item->SetRadioGroupStart(m_startRadioGroup);
            wxMenuItemList::Node *node = GetMenuItems().Item(m_startRadioGroup);

            if ( node )
            {
                node->GetData()->SetRadioGroupEnd(count);
            }
            else
            {
                wxFAIL_MSG( _T("where is the radio group start item?") );
            }
        }
    }
    else // not a radio item
    {
        EndRadioGroup();
    }

    if ( !wxMenuBase::DoAppend(item) || !DoInsertOrAppend(item) )
    {
        return FALSE;
    }

    if ( check )
    {
        // check the item initially
        item->Check(TRUE);
    }

    return TRUE;
}

bool wxMenu::DoInsert(size_t pos, wxMenuItem *item)
{
    return wxMenuBase::DoInsert(pos, item) && DoInsertOrAppend(item, pos);
}

wxMenuItem *wxMenu::DoRemove(wxMenuItem *item)
{
    // we need to find the items position in the child list
    size_t pos;
    wxMenuItemList::Node *node = GetMenuItems().GetFirst();
    for ( pos = 0; node; pos++ )
    {
        if ( node->GetData() == item )
            break;

        node = node->GetNext();
    }

    // DoRemove() (unlike Remove) can only be called for existing item!
    wxCHECK_MSG( node, NULL, wxT("bug in wxMenu::Remove logic") );

    ::DeleteMenuItem(MAC_WXHMENU(m_hMenu) , pos + 1);

    if ( IsAttached() )
    {
        // otherwise, the change won't be visible
        m_menuBar->Refresh();
    }

    // and from internal data structures
    return wxMenuBase::DoRemove(item);
}

void wxMenu::SetTitle(const wxString& label)
{
       m_title = label ;
    UMASetMenuTitle(MAC_WXHMENU(m_hMenu) , label ) ;
}
bool wxMenu::ProcessCommand(wxCommandEvent & event)
{
    bool processed = FALSE;

#if WXWIN_COMPATIBILITY
    // Try a callback
    if (m_callback)
    {
        (void)(*(m_callback))(*this, event);
        processed = TRUE;
    }
#endif WXWIN_COMPATIBILITY

    // Try the menu's event handler
    if ( !processed && GetEventHandler())
    {
        processed = GetEventHandler()->ProcessEvent(event);
    }

    // Try the window the menu was popped up from (and up through the
    // hierarchy)
    wxWindow *win = GetInvokingWindow();
    if ( !processed && win )
        processed = win->GetEventHandler()->ProcessEvent(event);

    return processed;
}


// ---------------------------------------------------------------------------
// other
// ---------------------------------------------------------------------------

wxWindow *wxMenu::GetWindow() const
{
    if ( m_invokingWindow != NULL )
        return m_invokingWindow;
    else if ( m_menuBar != NULL)
        return (wxWindow *) m_menuBar->GetFrame();

    return NULL;
}

// helper functions returning the mac menu position for a certain item, note that this is
// mac-wise 1 - based, i.e. the first item has index 1 whereas on MSWin it has pos 0

int wxMenu::MacGetIndexFromId( int id )
{
    size_t pos;
    wxMenuItemList::Node *node = GetMenuItems().GetFirst();
    for ( pos = 0; node; pos++ )
    {
        if ( node->GetData()->GetId() == id )
            break;

        node = node->GetNext();
    }

    if (!node)
        return 0;

    return pos + 1 ;
}

int wxMenu::MacGetIndexFromItem( wxMenuItem *pItem )
{
    size_t pos;
    wxMenuItemList::Node *node = GetMenuItems().GetFirst();
    for ( pos = 0; node; pos++ )
    {
        if ( node->GetData() == pItem )
            break;

        node = node->GetNext();
    }

    if (!node)
        return 0;

    return pos + 1 ;
}

void wxMenu::MacEnableMenu( bool bDoEnable )
{
    UMAEnableMenuItem(MAC_WXHMENU(m_hMenu) , 0 , bDoEnable ) ;

    ::DrawMenuBar() ;
}

// MacOS needs to know about submenus somewhere within this menu
// before it can be displayed , also hide special menu items like preferences
// that are handled by the OS
void wxMenu::MacBeforeDisplay( bool isSubMenu )
{
    wxMenuItem* previousItem = NULL ;
    size_t pos ;
    wxMenuItemList::Node *node;
    wxMenuItem *item;
    for (pos = 0, node = GetMenuItems().GetFirst(); node; node = node->GetNext(), pos++)
    {
        item = (wxMenuItem *)node->GetData();
        wxMenu* subMenu = item->GetSubMenu() ;
        if (subMenu)
        {
            subMenu->MacBeforeDisplay( true ) ;
        }
        else
        {
            #if TARGET_CARBON
            if ( UMAGetSystemVersion() >= 0x1000 )
            {
                if ( item->GetId() == wxApp::s_macPreferencesMenuItemId || item->GetId() == wxApp::s_macExitMenuItemId)
                {
                    ChangeMenuItemAttributes( MAC_WXHMENU( GetHMenu() ) , pos + 1, kMenuItemAttrHidden, 0 );
                    if ( GetMenuItems().GetCount() == pos + 1 &&
                            previousItem != NULL &&
                                previousItem->IsSeparator() )
                    {
                        ChangeMenuItemAttributes( MAC_WXHMENU( GetHMenu() ) , pos , kMenuItemAttrHidden, 0 );
                    }
                }
            }
            #endif
        }
        previousItem = item ;
    }

    if ( isSubMenu )
        ::InsertMenu(MAC_WXHMENU( GetHMenu()), -1);

}
// undo all changes from the MacBeforeDisplay call
void wxMenu::MacAfterDisplay( bool isSubMenu )
{
    if ( isSubMenu )
        ::DeleteMenu(MacGetMenuId());

    wxMenuItem* previousItem = NULL ;
    int pos ;
    wxMenuItemList::Node *node;
    wxMenuItem *item;
    for (pos = 0, node = GetMenuItems().GetFirst(); node; node = node->GetNext(), pos++)
    {
        item = (wxMenuItem *)node->GetData();
        wxMenu* subMenu = item->GetSubMenu() ;
        if (subMenu)
        {
            subMenu->MacAfterDisplay( true ) ;
        }
        else
        {
            // no need to undo hidings
        }
        previousItem = item ;
    }
}

// Menu Bar

/*

Mac Implementation note :

The Mac has only one global menubar, so we attempt to install the currently
active menubar from a frame, we currently don't take into account mdi-frames
which would ask for menu-merging

Secondly there is no mac api for changing a menubar that is not the current
menubar, so we have to wait for preparing the actual menubar until the
wxMenubar is to be used

We can in subsequent versions use MacInstallMenuBar to provide some sort of
auto-merge for MDI in case this will be necessary

*/

wxMenuBar* wxMenuBar::s_macInstalledMenuBar = NULL ;
wxMenuBar* wxMenuBar::s_macCommonMenuBar = NULL ;

void wxMenuBar::Init()
{
    m_eventHandler = this;
    m_menuBarFrame = NULL;
    m_invokingWindow = (wxWindow*) NULL;
}

wxMenuBar::wxMenuBar()
{
    Init();
}

wxMenuBar::wxMenuBar( long WXUNUSED(style) )
{
    Init();
}


wxMenuBar::wxMenuBar(int count, wxMenu *menus[], const wxString titles[])
{
    Init();

    m_titles.Alloc(count);

    for ( int i = 0; i < count; i++ )
    {
        m_menus.Append(menus[i]);
        m_titles.Add(titles[i]);

        menus[i]->Attach(this);
    }
}

wxMenuBar::~wxMenuBar()
{
    if (s_macCommonMenuBar == this)
        s_macCommonMenuBar = NULL;
    if (s_macInstalledMenuBar == this)
    {
        ::ClearMenuBar();
        s_macInstalledMenuBar = NULL;
    }

}

void wxMenuBar::Refresh(bool WXUNUSED(eraseBackground), const wxRect *WXUNUSED(rect))
{
    wxCHECK_RET( IsAttached(), wxT("can't refresh unatteched menubar") );

    DrawMenuBar();
}

void wxMenuBar::MacInstallMenuBar()
{
    if ( s_macInstalledMenuBar == this )
        return ;

    wxStAppResource resload ;

    Handle menubar = ::GetNewMBar( kwxMacMenuBarResource ) ;
    wxString message ;
    wxCHECK_RET( menubar != NULL, wxT("can't read MBAR resource") );
    ::SetMenuBar( menubar ) ;
#if TARGET_API_MAC_CARBON
    ::DisposeMenuBar( menubar ) ;
#else
    ::DisposeHandle( menubar ) ;
#endif

#if TARGET_API_MAC_OS8
    MenuHandle menu = ::GetMenuHandle( kwxMacAppleMenuId ) ;
    if ( CountMenuItems( menu ) == 2 )
    {
        ::AppendResMenu(menu, 'DRVR');
    }
#endif

    // clean-up the help menu before adding new items
    MenuHandle mh = NULL ;
    if ( UMAGetHelpMenu( &mh , &firstUserHelpMenuItem) == noErr )
    {
        for ( int i = CountMenuItems( mh ) ; i >= firstUserHelpMenuItem ; --i )
        {
            DeleteMenuItem( mh , i ) ;
        }
    }
    else
    {
        mh = NULL ;
    }
#if TARGET_CARBON
    if ( UMAGetSystemVersion() >= 0x1000 && wxApp::s_macPreferencesMenuItemId)
    {
        wxMenuItem *item = FindItem( wxApp::s_macPreferencesMenuItemId , NULL ) ;
        if ( item == NULL || !(item->IsEnabled()) )
            DisableMenuCommand( NULL , kHICommandPreferences ) ;
        else
            EnableMenuCommand( NULL , kHICommandPreferences ) ;
    }
#endif
       for (size_t i = 0; i < m_menus.GetCount(); i++)
      {
        wxMenuItemList::Node *node;
        wxMenuItem *item;
        int pos ;
        wxMenu* menu = m_menus[i] , *subMenu = NULL ;

        if( m_titles[i] == wxT("?") || m_titles[i] == wxT("&?")  || m_titles[i] == wxApp::s_macHelpMenuTitleName )
        {
            if ( mh == NULL )
            {
                continue ;
            }

              for (pos = 0 , node = menu->GetMenuItems().GetFirst(); node; node = node->GetNext(), pos++)
              {
                 item = (wxMenuItem *)node->GetData();
                 subMenu = item->GetSubMenu() ;
                if (subMenu)
                {
                    // we don't support hierarchical menus in the help menu yet
                }
                else
                {
                    if ( item->IsSeparator() )
                    {
                        if ( mh )
                            MacAppendMenu(mh, "\p-" );
                    }
                    else
                    {
                        wxAcceleratorEntry* entry = wxGetAccelFromString( item->GetText() ) ;

                        if ( item->GetId() == wxApp::s_macAboutMenuItemId )
                        {
                                UMASetMenuItemText( GetMenuHandle( kwxMacAppleMenuId ) , 1 , item->GetText()  );
                                UMAEnableMenuItem( GetMenuHandle( kwxMacAppleMenuId ) , 1 , true );
                                SetMenuItemCommandID( GetMenuHandle( kwxMacAppleMenuId ) , 1 , item->GetId() ) ;
                                UMASetMenuItemShortcut( GetMenuHandle( kwxMacAppleMenuId ) , 1 , entry ) ;
                         }
                        else
                        {
                            if ( mh )
                            {
                                UMAAppendMenuItem(mh, item->GetText()  , entry );
                                SetMenuItemCommandID( mh , CountMenuItems(mh) , item->GetId() ) ;
                            }
                        }

                        delete entry ;
                    }
                }
            }
        }
        else
        {
            UMASetMenuTitle( MAC_WXHMENU(menu->GetHMenu()) , m_titles[i] ) ;
            m_menus[i]->MacBeforeDisplay(false) ;
            ::InsertMenu(MAC_WXHMENU(m_menus[i]->GetHMenu()), 0);
        }
    }
    ::DrawMenuBar() ;
    s_macInstalledMenuBar = this;
}

void wxMenuBar::EnableTop(size_t pos, bool enable)
{
    wxCHECK_RET( IsAttached(), wxT("doesn't work with unattached menubars") );
    m_menus[pos]->MacEnableMenu( enable ) ;
    Refresh();
}

void wxMenuBar::SetLabelTop(size_t pos, const wxString& label)
{
    wxCHECK_RET( pos < GetMenuCount(), wxT("invalid menu index") );

    m_titles[pos] = label;

    if ( !IsAttached() )
    {
        return;
    }

    m_menus[pos]->SetTitle( label ) ;
    if (wxMenuBar::s_macInstalledMenuBar == this) // are we currently installed ?
    {
        ::SetMenuBar( GetMenuBar() ) ;
        ::InvalMenuBar() ;
    }
}

wxString wxMenuBar::GetLabelTop(size_t pos) const
{
    wxCHECK_MSG( pos < GetMenuCount(), wxEmptyString,
                 wxT("invalid menu index in wxMenuBar::GetLabelTop") );

    return m_titles[pos];
}

int wxMenuBar::FindMenu(const wxString& title)
{
    wxString menuTitle = wxStripMenuCodes(title);

    size_t count = GetMenuCount();
    for ( size_t i = 0; i < count; i++ )
    {
        wxString title = wxStripMenuCodes(m_titles[i]);
        if ( menuTitle == title )
            return i;
    }

    return wxNOT_FOUND;

}


// ---------------------------------------------------------------------------
// wxMenuBar construction
// ---------------------------------------------------------------------------

// ---------------------------------------------------------------------------
// wxMenuBar construction
// ---------------------------------------------------------------------------

wxMenu *wxMenuBar::Replace(size_t pos, wxMenu *menu, const wxString& title)
{
    wxMenu *menuOld = wxMenuBarBase::Replace(pos, menu, title);
    if ( !menuOld )
        return FALSE;
    m_titles[pos] = title;

    if ( IsAttached() )
    {
        if (s_macInstalledMenuBar == this)
        {
            menuOld->MacAfterDisplay( false ) ;
            ::DeleteMenu( menuOld->MacGetMenuId() /* m_menus[pos]->MacGetMenuId() */ ) ;
            {
                menu->MacBeforeDisplay( false ) ;
                UMASetMenuTitle( MAC_WXHMENU(menu->GetHMenu()) , title ) ;
                if ( pos == m_menus.GetCount() - 1)
                {
                    ::InsertMenu( MAC_WXHMENU(menu->GetHMenu()) , 0 ) ;
                }
                else
                {
                    ::InsertMenu( MAC_WXHMENU(menu->GetHMenu()) , m_menus[pos+1]->MacGetMenuId() ) ;
                }
            }
        }

        Refresh();
    }

    return menuOld;
}

bool wxMenuBar::Insert(size_t pos, wxMenu *menu, const wxString& title)
{
    if ( !wxMenuBarBase::Insert(pos, menu, title) )
        return FALSE;

    m_titles.Insert(title, pos);

    UMASetMenuTitle( MAC_WXHMENU(menu->GetHMenu()) , title ) ;

    if ( IsAttached() && s_macInstalledMenuBar == this )
    {
        if (s_macInstalledMenuBar == this)
        {
            menu->MacBeforeDisplay( false ) ;
            if ( pos == (size_t) -1  || pos + 1 == m_menus.GetCount() )
            {
                ::InsertMenu( MAC_WXHMENU(menu->GetHMenu()) , 0 ) ;
            }
            else
            {
                ::InsertMenu( MAC_WXHMENU(menu->GetHMenu()) , m_menus[pos+1]->MacGetMenuId() ) ;
            }
        }
        Refresh();
    }

    return TRUE;
}

wxMenu *wxMenuBar::Remove(size_t pos)
{
    wxMenu *menu = wxMenuBarBase::Remove(pos);
    if ( !menu )
        return NULL;

    if ( IsAttached() )
    {
        if (s_macInstalledMenuBar == this)
        {
            ::DeleteMenu( menu->MacGetMenuId() /* m_menus[pos]->MacGetMenuId() */ ) ;
        }

        menu->Detach();

        Refresh();
    }

    m_titles.RemoveAt(pos);

    return menu;
}

bool wxMenuBar::Append(wxMenu *menu, const wxString& title)
{
    WXHMENU submenu = menu ? menu->GetHMenu() : 0;
    wxCHECK_MSG( submenu, FALSE, wxT("can't append invalid menu to menubar") );

    if ( !wxMenuBarBase::Append(menu, title) )
        return FALSE;

    m_titles.Add(title);

    UMASetMenuTitle( MAC_WXHMENU(menu->GetHMenu()) , title ) ;

    if ( IsAttached() )
    {
        if (s_macInstalledMenuBar == this)
        {
            ::InsertMenu( MAC_WXHMENU(menu->GetHMenu()) , 0 ) ;
        }

        Refresh();
    }

   // m_invokingWindow is set after wxFrame::SetMenuBar(). This call enables
    // adding menu later on.
    if (m_invokingWindow)
        wxMenubarSetInvokingWindow( menu, m_invokingWindow );

    return TRUE;
}

static void wxMenubarUnsetInvokingWindow( wxMenu *menu )
{
    menu->SetInvokingWindow( (wxWindow*) NULL );

    wxMenuItemList::Node *node = menu->GetMenuItems().GetFirst();
    while (node)
    {
        wxMenuItem *menuitem = node->GetData();
        if (menuitem->IsSubMenu())
            wxMenubarUnsetInvokingWindow( menuitem->GetSubMenu() );
        node = node->GetNext();
    }
}

static void wxMenubarSetInvokingWindow( wxMenu *menu, wxWindow *win )
{
    menu->SetInvokingWindow( win );

    wxMenuItemList::Node *node = menu->GetMenuItems().GetFirst();
    while (node)
    {
        wxMenuItem *menuitem = node->GetData();
        if (menuitem->IsSubMenu())
            wxMenubarSetInvokingWindow( menuitem->GetSubMenu() , win );
        node = node->GetNext();
    }
}

void wxMenuBar::UnsetInvokingWindow()
{
    m_invokingWindow = (wxWindow*) NULL;
    wxMenuList::Node *node = m_menus.GetFirst();
    while (node)
    {
        wxMenu *menu = node->GetData();
        wxMenubarUnsetInvokingWindow( menu );
        node = node->GetNext();
    }
}

void wxMenuBar::SetInvokingWindow(wxFrame *frame)
{
    m_invokingWindow = frame;
    wxMenuList::Node *node = m_menus.GetFirst();
    while (node)
    {
        wxMenu *menu = node->GetData();
        wxMenubarSetInvokingWindow( menu, frame );
        node = node->GetNext();
    }
}

void wxMenuBar::Detach()
{
    wxMenuBarBase::Detach() ;
}

void wxMenuBar::Attach(wxFrame *frame)
{
    wxMenuBarBase::Attach( frame ) ;
}
// ---------------------------------------------------------------------------
// wxMenuBar searching for menu items
// ---------------------------------------------------------------------------

// Find the itemString in menuString, and return the item id or wxNOT_FOUND
int wxMenuBar::FindMenuItem(const wxString& menuString,
                            const wxString& itemString) const
{
    wxString menuLabel = wxStripMenuCodes(menuString);
    size_t count = GetMenuCount();
    for ( size_t i = 0; i < count; i++ )
    {
        wxString title = wxStripMenuCodes(m_titles[i]);
        if ( menuString == title )
            return m_menus[i]->FindItem(itemString);
    }

    return wxNOT_FOUND;
}

wxMenuItem *wxMenuBar::FindItem(int id, wxMenu **itemMenu) const
{
    if ( itemMenu )
        *itemMenu = NULL;

    wxMenuItem *item = NULL;
    size_t count = GetMenuCount();
    for ( size_t i = 0; !item && (i < count); i++ )
    {
        item = m_menus[i]->FindItem(id, itemMenu);
    }

    return item;
}