QTreeWidget指定子节点弹出菜单

方法：判断父对象

1. connect(ui->treeWidget_nav, &QTreeWidget::itemChanged, [=](QTreeWidgetItem *TWI){
2.     if (TWI->parent() == TWI_bookmark) {
3.         qDebug() << TWI->data(0, LOCATION_OF_REAL_PATH).toString() << TWI->text(0);
4.     }
5. });
6. ui->treeWidget_nav->setContextMenuPolicy(Qt::CustomContextMenu);
7. QMenu *menu_bookmark = new QMenu(ui->treeWidget_nav);
8. QAction *action_bookmark_rename = new QAction("重命名");
9. QAction *action_bookmark_move_up = new QAction("上移");
10. QAction *action_bookmark_move_down = new QAction("下移");
11. QAction *action_bookmark_delete = new QAction("删除");
12. menu_bookmark->addAction(action_bookmark_rename);
13. menu_bookmark->addAction(action_bookmark_move_up);
14. menu_bookmark->addAction(action_bookmark_move_down);
15. menu_bookmark->addAction(action_bookmark_delete);
16. connect(ui->treeWidget_nav, &QTreeWidget::customContextMenuRequested, [=](const QPoint &pos){
17.     QTreeWidgetItem *TWI = ui->treeWidget_nav->itemAt(pos);
18.     if (TWI->parent() == TWI_bookmark) {
19.         menu_bookmark->exec(ui->treeWidget_nav->mapToGlobal(pos));
20.     }
21. });
22. connect(action_bookmark_rename, &QAction::triggered, [=](){
23.     ui->treeWidget_nav->editItem(ui->treeWidget_nav->currentItem(), 0);
24. });

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