setView

設定combobox的顯示視窗,並且設定tableview的選中項為當前顯示項

ui->comboBox->setModel(model);
QTableView *tableView = new QTableView;
      tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
      tableView->setMinimumWidth(300);
      ui->comboBox->setView(tableView);
      connect(ui->comboBox->view(), &QAbstractItemView::pressed, [&](){
          oldText = ui->comboBox->model()->data(ui->comboBox->view()->currentIndex()).toString();
          qDebug() << ui->comboBox->model()->data(ui->comboBox->view()->currentIndex()).toString() << oldText;
      });
      connect(ui->comboBox,&QComboBox::currentTextChanged,[&]() {
          ui->comboBox->blockSignals(true);
          ui->comboBox->setCurrentText(oldText);
          ui->comboBox->blockSignals(false);
      });
 

showPopup

重寫顯示方式,顯示的位置位於combobox上方

void MyComboBox::showPopup()
{
    QComboBox::showPopup();
    QWidget *popup = this->findChild<QFrame*>();
    popup->move(popup->x(),popup->y()-this->height()-popup->height());
}
```*