自学教程：C++ updateMenu函数代码示例

    void MainMenu::setVisible (bool visible)    {        if (visible)            updateMenu();        OEngine::GUI::Layout::setVisible (visible);    }

TrayIcon::TrayIcon(Application *parent) : QObject(parent),	m_icon(new QSystemTrayIcon(this)){	QMenu *menu = new QMenu();	menu->addAction(tr("Show Windows"))->setData(QLatin1String("toggleVisibility"));	menu->addSeparator();	menu->addAction(tr("New Tab"))->setData(QLatin1String("newTab"));	menu->addAction(tr("New Private Tab"))->setData(QLatin1String("newPrivateTab"));	menu->addSeparator();	menu->addAction(tr("Bookmarks"))->setData(QLatin1String("bookmarks"));	menu->addAction(tr("Transfers"))->setData(QLatin1String("transfers"));	menu->addAction(tr("History"))->setData(QLatin1String("history"));	menu->addSeparator();	menu->addAction(tr("Exit"))->setData(QLatin1String("exit"));	m_icon->setIcon(parent->windowIcon());	m_icon->setContextMenu(menu);	m_icon->setToolTip(tr("Otter Browser"));	m_icon->show();	setParent(NULL);	connect(Application::getInstance(), SIGNAL(aboutToQuit()), this, SLOT(hide()));	connect(this, SIGNAL(destroyed()), menu, SLOT(deleteLater()));	connect(parent, SIGNAL(destroyed()), this, SLOT(deleteLater()));	connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(triggerAction(QAction*)));	connect(menu, SIGNAL(aboutToShow()), this, SLOT(updateMenu()));	connect(m_icon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(activated(QSystemTrayIcon::ActivationReason)));}

RecentFiles::RecentFiles( QMenu * menu, QAction * before, int maxfiles, const QString& settingsname ){	if ( maxfiles < 1 )		qFatal( "RecentFiles::RecentFiles: maxfiles (%d) is < 1 ", maxfiles );	m_settingsName = settingsname.isEmpty() ? "recentFileList" : settingsname;	m_actions.resize( maxfiles );	// Create the actions	for ( int i = 0; i < maxfiles; ++i )	{		m_actions[i] = new QAction( this );		m_actions[i]->setVisible(false);		connect( m_actions[i], SIGNAL(triggered()), this, SLOT(actionRecent()) );	}	// Add them to the menu	for ( int i = 0; i < maxfiles; ++i )		menu->insertAction( before, m_actions[i] );	// Add a separator after the last action	m_separator = menu->insertSeparator( before );	// Update the actions menu	updateMenu();}

MainMenu::MainMenu(int w, int h)    : OEngine::GUI::Layout("openmw_mainmenu.layout")    , mButtonBox(0), mWidth (w), mHeight (h)    , mSaveGameDialog(NULL){    updateMenu();}

void QgsRendererV2DataDefinedMenus::sizeScaleFieldSelected( QAction* a ){  if ( a == NULL )    return;  QString fldName = a->text();#if 0  updateMenu( mSizeAttributeActionGroup, fldName );#endif  if ( fldName == tr( "- no field -" ) )  {    fldName = QString();  }  else if ( fldName.startsWith( tr( "- expression -" ) ) )  {    QString expr( fldName );    expr.replace( 0, tr( "- expression -" ).length(), "" );    QgsExpressionBuilderDialog dialog( mLayer, expr );    if ( !dialog.exec() ) return;    fldName = dialog.expressionText();    Q_ASSERT( !QgsExpression( fldName ).hasParserError() );    a->setText( tr( "- expression -" ) + fldName );  }  emit sizeScaleFieldChanged( fldName );}

void DolphinRemoteEncoding::slotAboutToShow(){    if (!m_loaded) {        loadSettings();    }    updateMenu();}

int ToolBar::qt_metacall(QMetaObject::Call _c, int _id, void **_a){    _id = QToolBar::qt_metacall(_c, _id, _a);    if (_id < 0)        return _id;    if (_c == QMetaObject::InvokeMetaMethod) {        switch (_id) {        case 0: order(); break;        case 1: randomize(); break;        case 2: addSpinBox(); break;        case 3: removeSpinBox(); break;        case 4: changeMovable((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 5: allowLeft((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 6: allowRight((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 7: allowTop((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 8: allowBottom((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 9: placeLeft((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 10: placeRight((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 11: placeTop((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 12: placeBottom((*reinterpret_cast< bool(*)>(_a[1]))); break;        case 13: updateMenu(); break;        case 14: insertToolBarBreak(); break;        default: ;        }        _id -= 15;    }    return _id;}

bool MountTray::addDevice(QString dev, QString label, QString type, QString filesys){  if(!dev.startsWith(DEVICEDIR)){ dev.prepend(DEVICEDIR); }    //Check if the device is already in the list  int tot=0;  for(int i=0; i<deviceList.length(); i++){    if( deviceList[i]->device == dev ){ return false; } //already exists, do nothing    if( deviceList[i]->getDeviceName().startsWith(label) ){ tot++; }  }  //See if the label is unique as well, otherwise add a number to the end to make it unique  if(tot > 0 && !label.isEmpty()){ label.append("-"+QString::number(tot)); }   qDebug() << "Valid Device Connection:" << dev << type << label << filesys;  //Create the menu item (will automount if necessary)  MenuItem *tmp = new MenuItem(this, DCheck, dev, label, type, filesys);  //connect the signals/slots  connect(tmp, SIGNAL(itemMounted(QString)), this, SLOT(openMediaDir(QString)) );  connect(tmp, SIGNAL(newMessage(QString,QString)), this, SLOT(slotDisplayPopup(QString,QString)) );  connect(tmp, SIGNAL(itemRemoved(QString)), this, SLOT(removeDevice(QString)) );  connect(tmp, SIGNAL(itemWorking()), this, SLOT(slotCloseMenu()) );  connect(tmp, SIGNAL(openAVDisk(QString)), this, SLOT(slotOpenAVDisk(QString)) );  deviceList << tmp;  //Update the menu  updateMenu();  return true;}

void application() {   scene = G_sceneMenu;      // Primera escena (y la actual)   nextScene = scene;        // Siguiente escena (siempre empieza siendo igual a la primera)   interruptId = 0;          // Primera interrupcion   // Initialize CPC before starting the game   initializeCPC();   // Inicializamos la primera escena   initScene(&scene);   // Main loop   while (1) {      // Scene updates      switch(scene) {         case G_sceneMenu:            nextScene = updateMenu();         break;         case G_sceneGame:            nextScene = updateGame();         break;      }      // Comprobamos si vamos a cambiar de escena      if(scene != nextScene) {         // Cambiamos la escena actual y la inicializamos         scene = nextScene;         initScene(&scene);      }   }}

void RecentFiles::removeRecentFile( const QString& file ){	QStringList files = loadRecentFiles();	files.removeAll( file );	saveRecentFiles( files );	updateMenu();}

void ChatWindowMenu::onStanzaSessionTerminated(const IStanzaSession &ASession){	if (ASession.streamJid==streamJid() && ASession.contactJid==contactJid())	{		restoreSessionPrefs(contactJid());		updateMenu();	}}

void MulticrewUI::disconnected( std::string error ) {	d->core->stop();	d->connection = 0;	updateMenu();	d->statusDlg->setUnconnected();		if( error.length()==0 )	error = "Session terminated";	MessageBox( d->hwnd, error.c_str(), "Multicrew", MB_OK | MB_ICONINFORMATION );}

void TrayIcon::pauseOrResume(){    _isPaused = !_isPaused;    updateMenu();    updateToolTip();    updateTrayIcon();}

void ProfileAddDialog::createProfile() {    QString folder = QApplication::applicationDirPath() + "/profiles/" + ui->lineEdit->text();    if(!ui->lineEdit->text().isEmpty()) {        if(!QDir(folder).exists())            QDir().mkdir(folder);    }    emit updateMenu();}

void loopMainMenu(Inputs input, Map *map, Map *menu) {	updateMenu(&input, &map);	if (isOnMenu() != IS_IN_PRINCIPAL_MENU)		clearWindow();	else		drawMenu(menu);}

void FractalImagesFrame::OnCloseFractal(wxCommandEvent& WXUNUSED(event)){	int pos = m_tabs->GetSelection();	closeTab(pos);	updateMenu();}

void updateDisplay() {  int elapsed = 0;  int countdown = 0;  elapsed = s_currentTimer/2;  countdown = s_selectedDuration - elapsed;    if(s_currentTimer%2 == 0) {    static char bUp[10];    static char bDown[4];    //static char bDuration[10];    //static char bDuration[5];    //static int elapsed = 0;    //static int countdown = 0;        //elapsed = s_currentTimer/2;    //countdown = s_selectedDuration - elapsed;    if(countdown > 0) {      //printInt(s_countup, elapsed, bUp);      printInt(s_countdown, countdown, bDown);      //printInt(s_duration, s_selectedDuration, bDuration);            snprintf(bUp, 10, "%d / %d", elapsed, s_selectedDuration);      text_layer_set_text(s_countup, bUp);    } else {      printInt(s_countup, elapsed - s_selectedDuration, bUp);      //text_layer_set_text(s_duration, "");    }         if(countdown == 10) {      vibes_double_pulse();    } else if(countdown == 3) {      vibes_long_pulse();    } else if(countdown == 2 || countdown == 1) {      vibes_short_pulse();    } else if(countdown == 0) {      window_set_background_color(s_window, GColorWhite);      vibes_long_pulse();      s_timerActive = false;      updateMenu(s_selectedDuration);      text_layer_set_text(s_countdown, "");      text_layer_set_text(s_countup, "");      updateSets();    }  }    if(s_timerActive) {    if(countdown <= 10) {       window_set_background_color(s_window, GColorRed);    } else if (s_currentTimer < s_selectedDuration) {      window_set_background_color(s_window, GColorGreen);    } else {      window_set_background_color(s_window, GColorOrange);      if(s_currentTimer == s_selectedDuration) { // halfway point        vibes_double_pulse();      }     }  }}

void MRU::initialise(){	// Construct the MRU commands and menu structure	constructMenu();	// Initialise the most recently used files list	loadRecentFiles();	updateMenu();}

void FileHistoryHandler::restoreState(){  filePaths = atools::settings::Settings::instance().valueStrList(settings);  // Convert all loaded paths to native  for(int i = 0; i < filePaths.size(); i++)    filePaths[i] = QDir::toNativeSeparators(filePaths.at(i));  updateMenu();}

TVList::TVList(bool check_channels_conf, Services services, QString filename, QWidget * parent) 	: Favorites(filename,parent){#ifndef Q_OS_WIN	if (check_channels_conf) {		/* f_list.clear(); */		parse_channels_conf(services);		updateMenu();	}#endif}

    void MainMenu::setVisible (bool visible)    {        if (visible)            updateMenu();        else            showBackground(                        MWBase::Environment::get().getWindowManager()->containsMode(MWGui::GM_MainMenu) &&                        MWBase::Environment::get().getStateManager()->getState() == MWBase::StateManager::State_NoGame);        OEngine::GUI::Layout::setVisible (visible);    }

void Menu::show(sf::Vector2f pos){	updateMenu();	setVisible(true);	if (isVerticalFlipped())		setPosition(pos.x, pos.y - getSize().y);	else		setPosition(pos);	acquireFocus();}

void RecentFilesAction::addFile(const QString &fileName){	if (m_recentFilesList.contains(fileName))		m_recentFilesList.move(m_recentFilesList.indexOf(fileName), 0);	else	{		if (m_recentFilesList.count() >= m_numOfRecentFiles)			m_recentFilesList.removeLast();		m_recentFilesList.prepend(fileName);	}	updateMenu();}

void MainState::play () {    if(_state == PLAYING && _messages.empty()) {        log().warning("Turn");        if(_fight->game_over()) {            _state = GAME_OVER;        } else if(_fight->tick_fight()) {            _state = BOSS_TURN;            updateMenu();            openMenu(_mainMenu.get());        }        updateHealthBars();    }}

void LastRecentFileList::remove(int index) {	if (_size == 0 || _locked)		return;	if (index > -1 && index < (int)_lrfl.size())	{		::RemoveMenu(_hMenu, _lrfl.at(index)._id, MF_BYCOMMAND);		setAvailable(_lrfl.at(index)._id);		_lrfl.erase(_lrfl.begin() + index);		--_size;		updateMenu();	}};

void MountTray::removeDevice(QString dev){  if(!dev.startsWith(DEVICEDIR)){ dev.prepend(DEVICEDIR); }    //Find the device in the list  int index = findDeviceInList(dev);  if( index == -1 ){ return; } //does not exist, do nothing  //Remove the menu entry from the list  deviceList[index]->cleanup(); //make sure it is unmounted with mountpoint removed  deviceList.removeAt(index);  //Update the menu  updateMenu();  qDebug() << "Valid Device Removal:" <<  dev;}

VstEffectControls::VstEffectControls( VstEffect * _eff ) :	EffectControls( _eff ),	m_effect( _eff ),	m_subWindow( NULL ),	knobFModel( NULL ),	vstKnobs( NULL ),	ctrHandle( NULL ),	lastPosInMenu (0)//	m_presetLabel ( NULL ){	menu = new QMenu;	connect( menu, SIGNAL( aboutToShow() ), this, SLOT( updateMenu() ) );}