如何将 Qt 中的组合框元素与具有相同索引的静态向量中的预定义元素链接起来？

Question

我有20 个元素存储在vector 中，我想要做的是：当用户从下拉列表（组合框）中选择一个元素时，我的导航（路由）的源或目的地的值获得具有相同索引的无符号整数值来自矢量的组合框上的元素，我如何在 Qt 上使用组合框来做到这一点？

//Start
void MainWindow::fill_MyPlaces(){
    MyPlaces.push_back(make_pair("Aldi Store",1545694404)); //1 Aldi
    MyPlaces.push_back(make_pair("Restaurant Le Fut",1544558413)); //2 Restaurant Le Fut
    MyPlaces.push_back(make_pair("Place Schnider",1455348628)); //3 place schnider
    MyPlaces.push_back(make_pair("Acacias Residence",1540689869)); //4 Acacias
    MyPlaces.push_back(make_pair("IUT University",442028765));  //5 IUT
    MyPlaces.push_back(make_pair("Train Station (Gare du Creusot)",1387416514)); //6 Train Station (Gare du Creusot)
    MyPlaces.push_back(make_pair("Carrefour Shopping Center",1829507841)); //7 Carrefour
    MyPlaces.push_back(make_pair("Condorcet Center University",2019043458)); //8 Condorcet
    MyPlaces.push_back(make_pair("Hospital Creusot",2258325836)); //9 Hospital Creusot
    MyPlaces.push_back(make_pair("BNP PariBank",1544079469)); //10 BNP PariBank
    MyPlaces.push_back(make_pair("Acion Store",889114982)); //11 Action Store
    MyPlaces.push_back(make_pair("El-Loco Cafe",1540689876));//12 El-Loco Cafe
    MyPlaces.push_back(make_pair("Residence Jean Monnent",2244694498));//13 Residence Jean Monnent
    MyPlaces.push_back(make_pair("Crous Office & Restaurant",1540680545));//14 Crous Office & Restaurant
    MyPlaces.push_back(make_pair("Euro Lav(Laundry)",4846313478));//15 Euro Lav(Laundry)
    MyPlaces.push_back(make_pair("Pharmacie des Acacias",1540689863));//16 Pharmacie des Acacias
    MyPlaces.push_back(make_pair("Centre Medico Scolaire (Medical school)",1544558417));//17 centre medico scolaire (Medical school)
    MyPlaces.push_back(make_pair("Driving School",1544558167));//18 Driving School
    MyPlaces.push_back(make_pair("Le Poste",2019027442));//19 Le Poste
    MyPlaces.push_back(make_pair("MCDonld's",6269205284));//20 McDonald's
}
//End

Answer 1

QComboBox 允许您通过可以通过itemData()访问的角色存储其他信息：

#include <QtWidgets>

class Widget: public QWidget{
    Q_OBJECT
public:
    Widget(QWidget *parent=nullptr): 
        QWidget(parent), combo(new QComboBox), label(new QLabel)
    {
        QVBoxLayout *lay = new QVBoxLayout{this};
        lay->addWidget(combo);
        lay->addWidget(label);
        connect(combo, 
            QOverload<int>::of(&QComboBox::currentIndexChanged), 
            this, 
            &Widget::onCurrentIndexChanged);

        for(const std::pair<QString, int> & p: std::vector<std::pair<QString, int>>{
            {"Aldi Store", 1545694404}, //1 Aldi
            {"Restaurant Le Fut",1544558413}, //2 Restaurant Le Fut
            {"Place Schnider",1455348628}, //3 place schnider
            {"Acacias Residence",1540689869}, //4 Acacias
            {"IUT University",442028765},  //5 IUT
            {"Train Station (Gare du Creusot)",1387416514}, //6 Train Station (Gare du Creusot)
            {"Carrefour Shopping Center",1829507841}, //7 Carrefour
            {"Condorcet Center University",2019043458}, //8 Condorcet
            {"Hospital Creusot",2258325836}, //9 Hospital Creusot
            {"BNP PariBank",1544079469}, //10 BNP PariBank
            {"Acion Store",889114982}, //11 Action Store
            {"El-Loco Cafe",1540689876},//12 El-Loco Cafe
            {"Residence Jean Monnent",2244694498},//13 Residence Jean Monnent
            {"Crous Office & Restaurant",1540680545},//14 Crous Office & Restaurant
            {"Euro Lav(Laundry)",4846313478},//15 Euro Lav(Laundry)
            {"Pharmacie des Acacias",1540689863},//16 Pharmacie des Acacias
            {"Centre Medico Scolaire (Medical school)",1544558417},//17 centre medico scolaire (Medical school)
            {"Driving School",1544558167},//18 Driving School
            {"Le Poste",2019027442},//19 Le Poste
            {"MCDonld's",6269205284},//20 McDonald's
        }){
            combo->addItem(p.first, p.second);
        }
    }
public slots:
    void onCurrentIndexChanged(int index){
        int value = combo->itemData(index).value<int>();
        label->setNum(value);
    }
private:
    QComboBox *combo;
    QLabel *label;
};


int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    Widget w;
    w.show();
    return app.exec();
}

#include "main.moc"