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

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"));}

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