QMenu的个性化定制
经常使用菜单，菜单的定制相当重要，普通的样式设置不难，一般需求足以实现（QMenu + QAction）。如果要足够个性，则需要进行一定的定制。 说起定制，其实也是利用Qt中现成的组件进行组装而已，使用QMenu + QWidgetAction + QAction，再加上QSS美化就可实现个性的QMenu。
先看效果（模仿酷狗所做的一个托盘菜单）：

主要代码如下：
SystemTray::SystemTray(): QSystemTrayIcon(){this->createActions();this->createPlayAction();this->addActions();this->translateLanguage();this->setContextMenu(pop_menu);}
SystemTray::~SystemTray(){}
void SystemTray::translateLanguage(){this->setToolTip(tr("hey music"));this->switchPlayToolTip(is_paly); backward_button->setToolTip(tr("backward")); forward_button->setToolTip(tr("forward"));
show_action->setText(tr("show"));setting_action->setText(tr("setting"));lock_lrc_action->setText(tr("lock lrc"));this->showLrc(is_show);login_action->setText(tr("login"));logout_action->setText(tr("logout"));}
void SystemTray::createActions(){this->setIcon(QIcon(":/images/music.png"));
pop_menu = new QMenu();show_action = new QAction(pop_menu);setting_action = new QAction(pop_menu);lock_lrc_action = new QAction(pop_menu);show_lrc_action = new QAction(pop_menu);login_action = new QAction(pop_menu);logout_action = new QAction(pop_menu);
connect(show_action, &QAction::triggered, this, &SystemTray::showWidget);connect(show_lrc_action, &QAction::triggered, this, static_cast(&SystemTray::showLrc));connect(login_action, &QAction::triggered, this, &SystemTray::showLoginWidget);connect(logout_action, &QAction::triggered, this, &SystemTray::logoutWidget);}
void SystemTray::createPlayAction(){play_widget = new QWidget();play_widget_action = new QWidgetAction(pop_menu);play_button = new QPushButton();backward_button = new QPushButton();forward_button = new QPushButton();music_name_label = new QLabel();
music_name_label->setFixedWidth(MUSIC_NAME_WIDTH);music_name_label->setAlignment(Qt::AlignCenter);QPixmap play_pixmap(":/action/pause"); play_button->setIcon(play_pixmap);play_button->setIconSize(play_pixmap.size());play_button->setObjectName("transparentButton");
QPixmap backward_pixmap(":/action/backward"); backward_button->setIcon(backward_pixmap);backward_button->setIconSize(backward_pixmap.size());backward_button->setObjectName("transparentButton");
QPixmap forward_pixmap(":/action/forward"); forward_button->setIcon(forward_pixmap);forward_button->setIconSize(forward_pixmap.size());forward_button->setObjectName("transparentButton");
backward_button->setCursor(Qt::PointingHandCursor);play_button->setCursor(Qt::PointingHandCursor);forward_button->setCursor(Qt::PointingHandCursor);
QHBoxLayout *layout = new QHBoxLayout();layout->addWidget(backward_button);layout->addWidget(play_button);layout->addWidget(forward_button);layout->setSpacing(0);layout->setContentsMargins(20, 0, 20, 0);
QVBoxLayout *layout2 = new QVBoxLayout();layout2->addLayout(layout);layout2->addWidget(music_name_label, 0, Qt::AlignCenter);layout2->setSpacing(5);layout2->setContentsMargins(0, 0, 0, 5);music_name_label->setText("player");music_name_label->setEnabled(false);play_widget->setLayout(layout2);play_widget_action->setDefaultWidget(play_widget);
connect(play_button, &QPushButton::clicked, this, &SystemTray::play);connect(backward_button, &QPushButton::clicked, this, &SystemTray::skipBackward);connect(forward_button, &QPushButton::clicked, this, &SystemTray::skipForward);}
void SystemTray::addActions(){pop_menu->addAction(play_widget_action);pop_menu->addSeparator();pop_menu->addAction(show_action);pop_menu->addSeparator();pop_menu->addAction(setting_action);pop_menu->addAction(lock_lrc_action);pop_menu->addAction(show_lrc_action);pop_menu->addSeparator();pop_menu->addAction(login_action);pop_menu->addAction(logout_action);}