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在接触Qt这段时间以来，经常遇到菜单项的问题（右键菜单、托盘菜单、按钮菜单等），QMenu用于菜单栏,上下文菜单,弹出菜单等，利用QMenu+QAction就可以达到效果！

右键菜单实现：通过重写contextMenuEvent(QContextMenuEvent *event)事件，QMenu+QAction即可完美实现！

对象：QTreeWidget

实现方式：createActions用于创建菜单、菜单项，contextMenuEvent用于实现菜单的显示，translateLanguage用于实现菜单的文本（此方法主要设置多语化使用）

void ImageTree::createActions()
{//创建菜单、菜单项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);//连接信号与槽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)
{//清除原有菜单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);//菜单出现的位置为当前鼠标的位置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"));
}

二级菜单的实现（包括三级菜单或者更多）也类似，只需要使用QMenu的addMenu()方法即可！