1. Qt之自定義菜單（右鍵菜單）

在接觸Qt這段時間以來，經常遇到菜單項的問題（右鍵菜單、托盤菜單、按鈕菜單等），QMenu用于菜單欄,上下文菜單,彈出菜單等，利用QMenu+QAction就可以達到效果！

???右鍵菜單實現：通過重寫contextMenuEvent(QContextMenuEvent *event)事件，QMenu+QAction即可完美實現！

????對象：QTreeWidget

???實現方式：createActions用于創建菜單、菜單項，contextMenuEvent用于實現菜單的顯示，translateLanguage用于實現菜單的文本（此方法主要設置多語化使用）

void ImageTree::createActions(){//創建菜單、菜單項pop_menu = new QMenu();add_images_action = new QAction(this);?add_folder_action = new QAction(this);remove_selected_action = new QAction(this);remove_all_action = new QAction(this);//連接信號與槽connect(add_images_action, &QAction::triggered, this, &ImageTree::selectImages);connect(add_folder_action, &QAction::triggered, this, &ImageTree::selectFolder);connect(remove_selected_action, &QAction::triggered, this, &ImageTree::removeSelectedImages);connect(remove_all_action, &QAction::triggered, this, &ImageTree::removeAllImages);}void ImageTree::contextMenuEvent(QContextMenuEvent *event){//清除原有菜單pop_menu->clear();pop_menu->addAction(add_images_action);pop_menu->addAction(add_folder_action);pop_menu->addAction(remove_selected_action);pop_menu->addAction(remove_all_action);//菜單出現的位置為當前鼠標的位置pop_menu->exec(QCursor::pos());event->accept();}void ImageTree::translateLanguage(){add_images_action->setText(tr("add images"));add_folder_action->setText(tr("add folder"));remove_selected_action->setText(tr("remove selected images"));remove_all_action->setText(tr("remove all images"));}

效果如下：

???二級菜單的實現（包括三級菜單或者更多）也類似，只需要使用QMenu的addMenu()方法即可！關于右鍵二級菜單的東西之前介紹過，詳情請參閱：QTableWidget詳解（樣式、右鍵菜單、表頭塌陷、多選等）。

2.?Qt之自定義菜單（托盤菜單）

繼右鍵菜單之后，再次探討托盤菜單。。。也許你對有些東西會感覺到莫名其妙，但大致思路不變，因為這些東西都是我根據實際項目所述。

??托盤菜單實現：通過QSystemTrayIcon+QMenu+QAction即可完美實現！

???實現方式：createActions用于創建菜單、菜單項,translateActions用于設置文本、實現多語化，translateAccount用于設置用戶空間配額。

void TrayMenu::createActions()

{

????help_menu = new QMenu();

????//創建菜單項

????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"));

????//添加菜單項

???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);

????//設置信號連接

????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);

}

???托盤菜單項建立完成之后，在建立自己的托盤，包括：托盤圖標、托盤提示信息等。

QSystemTrayIcon *system_tray = new QSystemTrayIcon();

//放在托盤提示信息、托盤圖標

system_tray ->setToolTip(QString("我就是托盤"));
system_tray ->setIcon(QIcon(":/icon/login"));

TrayMenu *tray_menu = new TrayMenu();
system_tray->setContextMenu(tray_menu);

//點擊托盤執行的事件
connect(system_tray?, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(iconIsActived(QSystemTrayIcon::ActivationReason)));
????connect(tray_menu, SIGNAL(showWidget()), this, SLOT(showNormal()));

//顯示托盤
system_tray->show();

//托盤顯示提示信息

system_tray->showMessage(QString("托盤標題"), QString("托盤顯示內容"));

效果如下：

??

更多參考：

• Qt之系統托盤（QSystemTrayIcon詳解）。

3.?Qt之自定義菜單（按鈕菜單）

?再次探討Qt的菜單，按鈕菜單也是很常用的東東，使用QPushButton(QToolButton)+QMenu+QAction即可完美實現！

???實現方式：createButton用于創建按鈕以及菜單，translateLanguage用于設置文本、實現多語化。

void WatermarksToolWidget::createButton()

{ ???

????remove_watermarks_button = new QPushButton();

????remove_menu = new QMenu();

????remove_selected_action = new QAction(remove_menu);

????remove_all_action = new QAction(remove_menu);

???remove_menu->addAction(remove_selected_action);

???remove_menu->addAction(remove_all_action);

???remove_watermarks_button->setMenu(remove_menu);

???//remove_watermarks_button->setStyleSheet("QPushButton::menu-indicator{image:None;}");

}

void WatermarksToolWidget::translateLanguage()

{

???remove_watermarks_button->setText(tr("remove"));

???remove_selected_action->setText(tr("remove selected watermarks"));

???remove_all_action->setText(tr("remove all watermarks"));

}

效果如下：

???兩者區別很明顯，第一個有下拉三角，第二個沒有。去掉下拉三角添加如下代碼即可： remove_watermarks_button->setStyleSheet("QPushButton::menu-indicator{image:None;}");

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