托盘菜单实现：通过QSystemTrayIcon+QMenu+QAction即可完美实现！

实现方式：createActions用于创建菜单、菜单项,translateActions用于设置文本、实现多语化，translateAccount用于设置用户空间配额。

void TrayMenu::createActions()
{help_menu = new QMenu();//创建菜单项action_show = new QAction(this);action_quit = new QAction(this);action_login_home = new QAction(this);action_account = new QAction(this);action_user_space = new QAction(this);action_help = new QAction(this);action_about = new QAction(this);action_check_update = new QAction(this);action_setting = new QAction(this);help_menu->setIcon(QIcon(":/icon/help"));action_show->setIcon(QIcon(":/icon/open"));action_login_home->setIcon(QIcon(":/icon/home"));action_account->setIcon(QIcon(":/icon/user"));action_help->setIcon(QIcon(":/icon/help"));action_about->setIcon(QIcon(":/icon/about"));action_check_update->setIcon(QIcon(":/icon/update"));action_setting->setIcon(QIcon(":/icon/set"));action_quit->setIcon(QIcon(":/icon/quit"));//添加菜单项help_menu->addAction(action_about);help_menu->addAction(action_help);help_menu->addAction(action_check_update);this->addAction(action_show);this->addAction(action_login_home);this->addSeparator();this->addAction(action_account);this->addAction(action_user_space);this->addSeparator();this->addAction(action_setting);this->addMenu(help_menu);this->addAction(action_quit);//设置信号连接connect(action_show, SIGNAL(triggered(bool)), this, SIGNAL(showWidget()));connect(action_quit, SIGNAL(triggered(bool)), this, SIGNAL(logoutWidget()));connect(action_setting, SIGNAL(triggered(bool)), this, SIGNAL(setUp()));connect(action_about, SIGNAL(triggered(bool)), this, SIGNAL(aboutUs()));connect(action_login_home, SIGNAL(triggered(bool)), MenuAction::getInstance(), SLOT(openLoginHome()));connect(action_help, SIGNAL(triggered(bool)), MenuAction::getInstance(), SLOT(openHelpMe()));QObject::connect(action_check_update, SIGNAL(triggered(bool)), MenuAction::getInstance(), SLOT(openCheckUpdate()));
}void TrayMenu::translateActions()
{help_menu->setTitle(tr("help"));action_show->setText(tr("open"));action_quit->setText(tr("quit"));action_login_home->setText(tr("login home"));this->translateAccount();action_help->setText(tr("instruction"));action_about->setText(tr("about us"));action_check_update->setText(tr("check update"));action_setting->setText(tr("setting"));
}void TrayMenu::translateAccount()
{action_user_space->setText(tr("use:") + use_space + QString("  ") + tr("total:") + total_space);
}托盘菜单项建立完成之后，在建立自己的托盘，包括：托盘图标、托盘提示信息等。
QSystemTrayIcon *system_tray = new QSystemTrayIcon();//放在托盘提示信息、托盘图标
system_tray ->setToolTip(QString("我就是托盘"));
system_tray ->setIcon(QIcon(":/icon/login"));TrayMenu *tray_menu = new TrayMenu();
system_tray->setContextMenu(tray_menu);//点击托盘执行的事件
connect(system_tray , SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(iconIsActived(QSystemTrayIcon::ActivationReason)));connect(tray_menu, SIGNAL(showWidget()), this, SLOT(showNormal()));//显示托盘
system_tray->show();//托盘显示提示信息
system_tray->showMessage(QString("托盘标题"), QString("托盘显示内容"));