src/msw/menu.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        menu.cpp
// Purpose:     wxMenu, wxMenuBar, wxMenuItem
// Author:      Julian Smart
// Modified by: Vadim Zeitlin
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

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

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/frame.h"
    #include "wx/menu.h"
    #include "wx/utils.h"
#endif

#if wxUSE_OWNER_DRAWN
    #include "wx/ownerdrw.h"
#endif

#include "wx/msw/private.h"
#include "wx/msw/menu.h"
#include "wx/menuitem.h"
#include "wx/log.h"

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

// ----------------------------------------------------------------------------
// global variables
// ----------------------------------------------------------------------------

extern wxMenu *wxCurrentPopupMenu;

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

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

// ----------------------------------------------------------------------------
// macros
// ----------------------------------------------------------------------------

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

// convenience macro
#define GetHMENU()          ((HMENU)GetHMenu())
#define GetHMenuOf(menu)    ((HMENU)menu->GetHMenu())

// ============================================================================
// implementation
// ============================================================================

// Menus

// Construct a menu with optional title (then use append)
wxMenu::wxMenu(const wxString& title, const wxFunction func)
      : m_title(title)
{
    m_parent = NULL;
    m_eventHandler = this;
    m_pInvokingWindow = NULL;
    m_doBreak = FALSE ;
    m_noItems = 0;
    m_menuBar = NULL;
    m_hMenu = (WXHMENU) CreatePopupMenu();
    m_savehMenu = 0 ;
    m_topLevelMenu = this;
    m_clientData = (void*) NULL;

    if ( !!m_title )
    {
        Append(idMenuTitle, m_title) ;
        AppendSeparator() ;
    }

    Callback(func);
}

// The wxWindow destructor will take care of deleting the submenus.
wxMenu::~wxMenu()
{
    if (m_hMenu)
        DestroyMenu((HMENU) m_hMenu);
    m_hMenu = 0;

    // Windows seems really bad on Menu de-allocation...
    // After many try, here is what I do: RemoveMenu() will ensure
    // that popup are "disconnected" from their parent; then call
    // delete method on each child (which in turn do a recursive job),
    // and finally, DestroyMenu()
    //
    // With that, BoundCheckers is happy, and no complaints...
    /*
       int N = 0 ;
       if (m_hMenu)
       N = GetMenuItemCount(m_hMenu);
       int i;
       for (i = N-1; i >= 0; i--)
       RemoveMenu(m_hMenu, i, MF_BYPOSITION);
     */

    // How is deleting submenus in this loop any different from deleting
    // the submenus in the children list, via ~wxWindow ?
    // I'll reinstate this deletion for now and remove addition
    // from children list (which doesn't exist now)
    // Julian 1/3/97
    wxNode *node = m_menuItems.First();
    while (node)
    {
        wxMenuItem *item = (wxMenuItem *)node->Data();

        // Delete child menus.
        // Beware: they must not be appended to children list!!!
        // (because order of delete is significant)
        if (item->GetSubMenu())
            item->DeleteSubMenu();

        wxNode *next = node->Next();
        delete item;
        delete node;
        node = next;
    }
    /*
       if (m_hMenu)
       DestroyMenu(m_hMenu);
       m_hMenu = 0;
     */
}

void wxMenu::Break()
{
    m_doBreak = TRUE ;
}

// function appends a new item or submenu to the menu
void wxMenu::Append(wxMenuItem *pItem)
{
    wxCHECK_RET( pItem != NULL, "can't append NULL item to the menu" );

    m_menuItems.Append(pItem);

    UINT flags = 0;

    if ( m_doBreak ) {
        flags |= MF_MENUBREAK;
        m_doBreak = FALSE;
    }

    if ( pItem->IsSeparator() ) {
        flags |= MF_SEPARATOR;
    }

    // id is the numeric id for normal menu items and HMENU for submenus
    UINT id;
    wxMenu *SubMenu = pItem->GetSubMenu();
    if ( SubMenu != NULL ) {
        wxASSERT( SubMenu->m_hMenu != (WXHMENU) NULL );

        id = (UINT)SubMenu->m_hMenu;

        SubMenu->m_topLevelMenu = m_topLevelMenu;
        SubMenu->m_parent       = this;
        SubMenu->m_savehMenu    = (WXHMENU)id;
        SubMenu->m_hMenu        = 0;

        flags |= MF_POPUP;
    }
    else {
        id = pItem->GetId();
    }

    LPCSTR pData;

#if wxUSE_OWNER_DRAWN
    if ( pItem->IsOwnerDrawn() ) {  // want to get {Measure|Draw}Item messages?
        // item draws itself, pass pointer to it in data parameter
        flags |= MF_OWNERDRAW;
        pData = (LPCSTR)pItem;
    }
    else
#endif
    {
        // menu is just a normal string (passed in data parameter)
        flags |= MF_STRING;
        pData = pItem->GetName();
    }

    // visually select the menu title
    if ( id == idMenuTitle )
    {
        // TODO use SetMenuItemInfo(MFS_DEFAULT) to put it in bold face
    }

    if ( !AppendMenu(GetHMENU(), flags, id, pData) )
    {
        wxLogLastError("AppendMenu");
    }

    m_noItems++;
}

void wxMenu::AppendSeparator()
{
    Append(new wxMenuItem(this, ID_SEPARATOR));
}

// Pullright item
void wxMenu::Append(int id, const wxString& label,
                    wxMenu *SubMenu, const wxString& helpString)
{
    Append(new wxMenuItem(this, id, label, helpString, FALSE, SubMenu));
}

// Ordinary menu item
void wxMenu::Append(int id, const wxString& label,
        const wxString& helpString, bool checkable)
{
    // 'checkable' parameter is useless for Windows.
    Append(new wxMenuItem(this, id, label, helpString, checkable));
}

void wxMenu::Delete(int id)
{
    wxMenuItem *item = NULL;
    int pos;
    wxNode *node;
    for (pos = 0, node = m_menuItems.First(); node; node = node->Next(), pos++)
    {
        item = (wxMenuItem *)node->Data();
        if ( item->GetId() == id )
            break;
    }

    wxCHECK_RET( node, "wxMenu::Delete(): item doesn't exist" );

    HMENU menu = GetHMENU();

    wxMenu *pSubMenu = item->GetSubMenu();
    if ( pSubMenu != NULL ) {
        RemoveMenu(menu, (UINT)pos, MF_BYPOSITION);
        pSubMenu->m_hMenu = pSubMenu->m_savehMenu;
        pSubMenu->m_savehMenu = 0;
        pSubMenu->m_parent = NULL;
        //     RemoveChild(item->subMenu);
        pSubMenu->m_topLevelMenu = NULL;
        // TODO: Why isn't subMenu deleted here???
        // Will put this in for now. Assuming this is supposed
        // to delete the menu, not just remove it.
        item->DeleteSubMenu();
    }
    else {
        DeleteMenu(menu, (UINT)pos, MF_BYPOSITION);
    }

    m_menuItems.DeleteNode(node);
    delete item;
}

void wxMenu::Enable(int id, bool Flag)
{
    wxMenuItem *item = FindItemForId(id);
    wxCHECK_RET( item != NULL, "can't enable non-existing menu item" );

    item->Enable(Flag);
}

bool wxMenu::IsEnabled(int id) const
{
    wxMenuItem *item = FindItemForId(id);
    wxCHECK_MSG( item != NULL, FALSE, "invalid item id" );

    return item->IsEnabled();
}

void wxMenu::Check(int id, bool Flag)
{
    wxMenuItem *item = FindItemForId(id);
    wxCHECK_RET( item != NULL, "can't get status of non-existing menu item" );

    item->Check(Flag);
}

bool wxMenu::IsChecked(int id) const
{
    wxMenuItem *item = FindItemForId(id);
    wxCHECK_MSG( item != NULL, FALSE, "invalid item id" );

    return item->IsChecked();
}

void wxMenu::SetTitle(const wxString& label)
{
    bool hasNoTitle = m_title.IsEmpty();
    m_title = label;

    HMENU hMenu = GetHMENU();

    if ( hasNoTitle )
    {
        if ( !label.IsEmpty() )
        {
            if ( !InsertMenu(hMenu, 0u, MF_BYPOSITION | MF_STRING,
                             (unsigned)idMenuTitle, m_title) ||
                 !InsertMenu(hMenu, 1u, MF_BYPOSITION, (unsigned)-1, NULL) )
            {
                wxLogLastError("InsertMenu");
            }
        }
    }
    else
    {
        if ( label.IsEmpty() )
        {
            // remove the title and the separator after it
            if ( !RemoveMenu(hMenu, 0, MF_BYPOSITION) ||
                 !RemoveMenu(hMenu, 0, MF_BYPOSITION) )
            {
                wxLogLastError("RemoveMenu");
            }
        }
        else
        {
            // modify the title
            if ( !ModifyMenu(hMenu, 0u,
                        MF_BYPOSITION | MF_STRING,
                        (unsigned)idMenuTitle, m_title) )
            {
                wxLogLastError("ModifyMenu");
            }
        }
    }

#ifndef __WIN16__
    // put the title string in bold face
    if ( !m_title.IsEmpty() )
    {
        MENUITEMINFO mii;
        mii.cbSize = sizeof(mii);
        mii.fMask = MIIM_STATE;
        mii.fState = MFS_DEFAULT;

        if ( !SetMenuItemInfo(hMenu, (unsigned)idMenuTitle, FALSE, &mii) )
        {
            wxLogLastError("SetMenuItemInfo");
        }
    }
#endif
}

const wxString wxMenu::GetTitle() const
{
    return m_title;
}

void wxMenu::SetLabel(int id, const wxString& label)
{
    wxMenuItem *item = FindItemForId(id) ;
    if (item==NULL)
        return;

    if (item->GetSubMenu()==NULL)
    {
        HMENU hMenu = GetHMENU();

        UINT was_flag = GetMenuState(hMenu, id, MF_BYCOMMAND);
        ModifyMenu(hMenu, id, MF_BYCOMMAND | MF_STRING | was_flag, id, label);
    }
    else
    {
        wxMenu *father = item->GetSubMenu()->m_topLevelMenu ;
        wxNode *node = father->m_menuItems.First() ;
        int i = 0 ;
        while (node)
        {
            wxMenuItem *matched = (wxMenuItem*)node->Data() ;
            if (matched==item)
                break ;
            i++ ;
            node = node->Next() ;
        }
        // Here, we have the position.
        ModifyMenu((HMENU)father->m_savehMenu,i,
                MF_BYPOSITION|MF_STRING|MF_POPUP,
                (UINT)item->GetSubMenu()->m_savehMenu,(const char *)label) ;
    }
    item->SetName(label);
}

wxString wxMenu::GetLabel(int id) const
{
    wxString label;
    wxMenuItem *pItem = FindItemForId(id) ;
    if (pItem)
        label = pItem->GetName() ;
    else
        wxFAIL_MSG("wxMenu::GetLabel: item doesn't exist");

    return label;
}

bool wxMenu::MSWCommand(WXUINT WXUNUSED(param), WXWORD id)
{
    // ignore commands from the menu title

    // NB: VC++ generates wrong assembler for `if ( id != idMenuTitle )'!!
    if ( id != (WXWORD)idMenuTitle )
    {
        wxCommandEvent event(wxEVT_COMMAND_MENU_SELECTED);
        event.SetEventObject( this );
        event.SetId( id );
        event.SetInt( id );
        ProcessCommand(event);
    }

    return TRUE;
}

// Finds the item id matching the given string, -1 if not found.
int wxMenu::FindItem (const wxString& itemString) const
{
    // FIXME fixed size buffer
    char buf1[200];
    char buf2[200];
    wxStripMenuCodes ((char *)(const char *)itemString, buf1);

    for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
        wxMenuItem *item = (wxMenuItem *) node->Data ();
        if (item->GetSubMenu())
        {
            int ans = item->GetSubMenu()->FindItem(itemString);
            if (ans > -1)
                return ans;
        }
        if ( !item->IsSeparator() )
        {
            wxStripMenuCodes((char *)item->GetName().c_str(), buf2);
            if (strcmp(buf1, buf2) == 0)
                return item->GetId();
        }
    }

    return wxNOT_FOUND;
}

wxMenuItem *wxMenu::FindItemForId(int itemId, wxMenu ** itemMenu) const
{
    if (itemMenu)
        *itemMenu = NULL;
    for (wxNode * node = m_menuItems.First (); node; node = node->Next ())
    {
        wxMenuItem *item = (wxMenuItem *) node->Data ();

        if (item->GetId() == itemId)
        {
            if (itemMenu)
                *itemMenu = (wxMenu *) this;
            return item;
        }

        if (item->GetSubMenu())
        {
            wxMenuItem *ans = item->GetSubMenu()->FindItemForId (itemId, itemMenu);
            if (ans)
                return ans;
        }
    }

    if (itemMenu)
        *itemMenu = NULL;
    return NULL;
}

void wxMenu::SetHelpString(int itemId, const wxString& helpString)
{
    wxMenuItem *item = FindItemForId (itemId);
    if (item)
        item->SetHelp(helpString);
    else
        wxFAIL_MSG("wxMenu::SetHelpString: item doesn't exist");
}

wxString wxMenu::GetHelpString (int itemId) const
{
    wxString help;
    wxMenuItem *item = FindItemForId (itemId);
    if (item)
        help = item->GetHelp();
    else
        wxFAIL_MSG("wxMenu::GetHelpString: item doesn't exist");

    return help;
}

void wxMenu::ProcessCommand(wxCommandEvent & event)
{
    bool processed = FALSE;

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

    // 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);
}

bool wxWindow::PopupMenu(wxMenu *menu, int x, int y)
{
    menu->SetInvokingWindow(this);
    menu->UpdateUI();

    HWND hWnd = (HWND) GetHWND();
    HMENU hMenu = (HMENU)menu->m_hMenu;
    POINT point;
    point.x = x;
    point.y = y;
    ::ClientToScreen(hWnd, &point);
    wxCurrentPopupMenu = menu;
    ::TrackPopupMenu(hMenu, TPM_RIGHTBUTTON, point.x, point.y, 0, hWnd, NULL);
    wxYield();
    wxCurrentPopupMenu = NULL;

    menu->SetInvokingWindow(NULL);

    return TRUE;
}

// Menu Bar
wxMenuBar::wxMenuBar()
{
    m_eventHandler = this;
    m_menuCount = 0;
    m_menus = NULL;
    m_titles = NULL;
    m_menuBarFrame = NULL;
    m_hMenu = 0;
}

wxMenuBar::wxMenuBar( long WXUNUSED(style) )
{
    m_eventHandler = this;
    m_menuCount = 0;
    m_menus = NULL;
    m_titles = NULL;
    m_menuBarFrame = NULL;
    m_hMenu = 0;
}

wxMenuBar::wxMenuBar(int N, wxMenu *Menus[], const wxString Titles[])
{
    m_eventHandler = this;
    m_menuCount = N;
    m_menus = Menus;
    m_titles = new wxString[N];
    int i;
    for ( i = 0; i < N; i++ )
        m_titles[i] = Titles[i];
    m_menuBarFrame = NULL;
    for (i = 0; i < N; i++)
        m_menus[i]->m_menuBar = (wxMenuBar *) this;

    m_hMenu = 0;
}

wxMenuBar::~wxMenuBar()
{
    // In fact, don't want menu to be destroyed before MDI
    // shuffling has taken place. Let it be destroyed
    // automatically when the window is destroyed.

    //  DestroyMenu(menu);
    //  m_hMenu = NULL;

    int i;
    /*
    // See remarks in ::~wxMenu() method
    // BEWARE - this may interfere with MDI fixes, so
    // may need to remove
    int N = 0 ;

    if (m_menuBarFrame && ((m_menuBarFrame->GetWindowStyleFlag() & wxSDI) == wxSDI))
    {
    if (menu)
    N = GetMenuItemCount(menu) ;
    for (i = N-1; i >= 0; i--)
    RemoveMenu(menu, i, MF_BYPOSITION);
    }
     */
    for (i = 0; i < m_menuCount; i++)
    {
        delete m_menus[i];
    }
    delete[] m_menus;
    delete[] m_titles;

    /* Don't destroy menu here, in case we're MDI and
       need to do some shuffling with VALID menu handles.
       if (menu)
       DestroyMenu(menu);
       m_hMenu = 0;
     */
}

// Must only be used AFTER menu has been attached to frame,
// otherwise use individual menus to enable/disable items
void wxMenuBar::Enable(int id, bool enable)
{
    int flag = enable ? MF_ENABLED : MF_GRAYED;

    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    wxCHECK_RET( item, "attempt to enable an item which doesn't exist" );

    EnableMenuItem(GetHMenuOf(itemMenu), id, MF_BYCOMMAND | flag);
}

void wxMenuBar::EnableTop(int pos, bool enable)
{
    int flag = enable ? MF_ENABLED : MF_GRAYED;;

    EnableMenuItem((HMENU)m_hMenu, pos, MF_BYPOSITION | flag);
    DrawMenuBar((HWND)m_menuBarFrame->GetHWND()) ;
}

// Must only be used AFTER menu has been attached to frame,
// otherwise use individual menus
void wxMenuBar::Check(int id, bool check)
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    wxCHECK_RET( item, "attempt to check an item which doesn't exist" );
    wxCHECK_RET( item->IsCheckable(), "attempt to check an uncheckable item" );

    int flag = check ? MF_CHECKED : MF_UNCHECKED;
    CheckMenuItem(GetHMenuOf(itemMenu), id, MF_BYCOMMAND | flag);
}

bool wxMenuBar::IsChecked(int id) const
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    wxCHECK_MSG( item, FALSE, "wxMenuItem::IsChecked(): no such item" );

    int flag = ::GetMenuState(GetHMenuOf(itemMenu), id, MF_BYCOMMAND);

    return (flag & MF_CHECKED) != 0;
}

bool wxMenuBar::IsEnabled(int id) const
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    wxCHECK_MSG( item, FALSE, "wxMenuItem::IsEnabled(): no such item" );

    int flag = ::GetMenuState(GetHMenuOf(itemMenu), id, MF_BYCOMMAND) ;

    return (flag & MF_ENABLED) != 0;
}

void wxMenuBar::SetLabel(int id, const wxString& label)
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    if (!item)
        return;

    HMENU hMenu = GetHMenuOf(itemMenu);
    UINT was_flag = ::GetMenuState(hMenu, id, MF_BYCOMMAND);
    ::ModifyMenu(hMenu, id, MF_BYCOMMAND | MF_STRING | was_flag, id, label);
}

wxString wxMenuBar::GetLabel(int id) const
{
    wxMenu *itemMenu = NULL;
    wxMenuItem *item = FindItemForId(id, &itemMenu) ;

    wxCHECK_MSG( item, "", "wxMenuItem::GetLabel(): no such item" );

    HMENU hMenu = GetHMenuOf(itemMenu);
    int len = ::GetMenuString(hMenu, id, NULL, 0, MF_BYCOMMAND);

    len++;  // for the NUL character
    wxString label;
    ::GetMenuString(hMenu, id, label.GetWriteBuf(len), len, MF_BYCOMMAND);
    label.UngetWriteBuf();

    return label;
}

void wxMenuBar::SetLabelTop(int pos, const wxString& label)
{
    UINT id;
    UINT was_flag = ::GetMenuState((HMENU)m_hMenu, pos, MF_BYPOSITION);
    if (was_flag & MF_POPUP)
    {
        was_flag &= 0xff ;
        id = (UINT)::GetSubMenu((HMENU)m_hMenu, pos) ;
    }
    else
    {
        id = pos;
    }

    ::ModifyMenu((HMENU)m_hMenu, pos, MF_BYPOSITION | MF_STRING | was_flag,
                  id, label) ;
}

wxString wxMenuBar::GetLabelTop(int pos) const
{
    int len = ::GetMenuString((HMENU)m_hMenu, pos, NULL, 0, MF_BYCOMMAND);

    len++;  // for the NUL character
    wxString label;
    ::GetMenuString((HMENU)m_hMenu, pos, label.GetWriteBuf(len), len, MF_BYCOMMAND);
    label.UngetWriteBuf();

    return label;
}

bool wxMenuBar::OnDelete(wxMenu *a_menu, int pos)
{
    if (!m_menuBarFrame)
        return TRUE;

    if (RemoveMenu((HMENU)m_hMenu, (UINT)pos, MF_BYPOSITION)) {
        m_menus[pos]->m_hMenu = m_menus[pos]->m_savehMenu;
        m_menus[pos]->m_savehMenu = 0;

        if (m_menuBarFrame) {
            DrawMenuBar((HWND) m_menuBarFrame->GetHWND()) ;
        }

        return TRUE;
    }

    return FALSE;
}

bool wxMenuBar::OnAppend(wxMenu *a_menu, const char *title)
{
    if (!a_menu->m_hMenu)
        return FALSE;

    if (!m_menuBarFrame)
        return TRUE;

    a_menu->m_savehMenu = a_menu->m_hMenu;
    a_menu->m_hMenu = 0;

    AppendMenu((HMENU)m_hMenu, MF_POPUP | MF_STRING, (UINT)a_menu->m_savehMenu, title);

    DrawMenuBar((HWND)m_menuBarFrame->GetHWND());

    return TRUE;
}

void wxMenuBar::Append (wxMenu * menu, const wxString& title)
{
    if (!OnAppend(menu, title))
        return;

    m_menuCount ++;
    wxMenu **new_menus = new wxMenu *[m_menuCount];
    wxString *new_titles = new wxString[m_menuCount];
    int i;

    for (i = 0; i < m_menuCount - 1; i++)
    {
        new_menus[i] = m_menus[i];
        m_menus[i] = NULL;
        new_titles[i] = m_titles[i];
        m_titles[i] = "";
    }
    if (m_menus)
    {
        delete[]m_menus;
        delete[]m_titles;
    }
    m_menus = new_menus;
    m_titles = new_titles;

    m_menus[m_menuCount - 1] = (wxMenu *)menu;
    m_titles[m_menuCount - 1] = title;

    ((wxMenu *)menu)->m_menuBar = (wxMenuBar *) this;
    ((wxMenu *)menu)->SetParent(this);
}

void wxMenuBar::Delete(wxMenu * menu, int i)
{
    int j;
    int ii = (int) i;

    if (menu != 0) {
        for (ii = 0; ii < m_menuCount; ii++) {
            if (m_menus[ii] == menu)
                break;
        }
        if (ii >= m_menuCount)
            return;
    } else {
        if (ii < 0 || ii >= m_menuCount)
            return;
        menu = m_menus[ii];
    }

    if (!OnDelete(menu, ii))
        return;

    menu->SetParent(NULL);

    -- m_menuCount;
    for (j = ii; j < m_menuCount; j++) {
        m_menus[j] = m_menus[j + 1];
        m_titles[j] = m_titles[j + 1];
    }
}

// Find the menu menuString, item itemString, and return the item id.
// Returns -1 if none found.
int wxMenuBar::FindMenuItem (const wxString& menuString, const wxString& itemString) const
{
    char buf1[200];
    char buf2[200];
    wxStripMenuCodes ((char *)(const char *)menuString, buf1);
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        wxStripMenuCodes ((char *)(const char *)m_titles[i], buf2);
        if (strcmp (buf1, buf2) == 0)
            return m_menus[i]->FindItem (itemString);
    }
    return -1;
}

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

    wxMenuItem *item = NULL;
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        item = m_menus[i]->FindItemForId (id, itemMenu);
        if (item)
            return item;
    }
    return NULL;
}

void wxMenuBar::SetHelpString (int id, const wxString& helpString)
{
    int i;
    for (i = 0; i < m_menuCount; i++)
    {
        if (m_menus[i]->FindItemForId (id))
        {
            m_menus[i]->SetHelpString (id, helpString);
            return;
        }
    }
}

wxString wxMenuBar::GetHelpString (int id) const
{
    wxString helpString;

    for (int i = 0; i < m_menuCount; i++)
    {
        wxMenuItem *item = m_menus[i]->FindItemForId(id);
        if ( item )
        {
            helpString = item->GetHelp();

            break;
        }
    }

    return helpString;
}

// ----------------------------------------------------------------------------
// helper functions
// ----------------------------------------------------------------------------

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

    return NULL;
}

WXHMENU wxMenu::GetHMenu() const
{
    if ( m_hMenu != 0 )
        return m_hMenu;
    else if ( m_savehMenu != 0 )
        return m_savehMenu;

    wxFAIL_MSG("wxMenu without HMENU");

    return 0;
}

// Update a menu and all submenus recursively. source is the object that has
// the update event handlers defined for it. If NULL, the menu or associated
// window will be used.
void wxMenu::UpdateUI(wxEvtHandler* source)
{
    if (!source && GetInvokingWindow())
        source = GetInvokingWindow()->GetEventHandler();
    if (!source)
        source = GetEventHandler();
    if (!source)
        source = this;

    wxNode* node = GetItems().First();
    while (node)
    {
        wxMenuItem* item = (wxMenuItem*) node->Data();
        if ( !item->IsSeparator() )
        {
            wxWindowID id = item->GetId();
            wxUpdateUIEvent event(id);
            event.SetEventObject( source );

            if (source->ProcessEvent(event))
            {
                if (event.GetSetText())
                    SetLabel(id, event.GetText());
                if (event.GetSetChecked())
                    Check(id, event.GetChecked());
                if (event.GetSetEnabled())
                    Enable(id, event.GetEnabled());
            }

            if (item->GetSubMenu())
                item->GetSubMenu()->UpdateUI(source);
        }
        node = node->Next();
    }
}