MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QIcon icon;
    icon.addFile(":/image/ksirtet.ico");

    // 填充第一個(gè)Main
    for(int x=0;x<10;x++)
    {
        ui->comboBox_Main->addItem(icon,QString::asprintf("元素_%d",x));
    }

    // 填充第二個(gè)SubMain
    icon.addFile(":/image/browser alt.ico");
    for(int x=0;x<10;x++)
    {
        ui->comboBox_SubMain->addItem(icon,QString::asprintf("元素_%d",x));
    }
}

#include <iostream>
#include <QList>
#include <QMap>

// --------------------------------------
// 定義全局變量
// --------------------------------------

// 存儲(chǔ)城市與ID
QMap<QString,int> City_Zone;

// 存儲(chǔ)地區(qū)與城市
QMap<QString,QList <QString>> map;

// 臨時(shí)變量
QList<QString> tmp;

MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    // --------------------------------------------
    // comboBox_Main設(shè)置主菜單
    ui->comboBox_Main->clear();
    QStringList str;
    str << "北京" << "上海" << "廣州" << "深圳";

    // 添加元素到主菜單
    ui->comboBox_Main->addItems(str);

    // 依次設(shè)置圖標(biāo)
    ui->comboBox_Main->setItemIcon(0,QIcon(":/image/ksirtet.ico"));
    ui->comboBox_Main->setItemIcon(1,QIcon(":/image/ksirtet.ico"));
    ui->comboBox_Main->setItemIcon(2,QIcon(":/image/ksirtet.ico"));
    ui->comboBox_Main->setItemIcon(3,QIcon(":/image/ksirtet.ico"));

    // --------------------------------------------
    // 設(shè)置城市和序號(hào)
    ui->comboBox_Main->clear();
    City_Zone.insert("請(qǐng)選擇",0);
    City_Zone.insert("北京",1);
    City_Zone.insert("上海",2);
    City_Zone.insert("廣州",3);
    City_Zone.insert("深圳",4);

    // --------------------------------------------
    // 循環(huán)填充一級(jí)菜單
    ui->comboBox_Main->clear();
    foreach(const QString &str,City_Zone.keys())
    {
        ui->comboBox_Main->addItem(QIcon(":/image/ksirtet.ico"),str,City_Zone.value(str));
    }

    // --------------------------------------------
    // 插入二級(jí)菜單
    tmp.clear();
    tmp << "大興區(qū)" << "昌平區(qū)" << "東城區(qū)" << "西城區(qū)";
    map["北京"] = tmp;

    tmp.clear();
    tmp << "黃浦區(qū)" << "徐匯區(qū)" << "長(zhǎng)寧區(qū)" << "楊浦區(qū)";
    map["上海"] = tmp;

    tmp.clear();
    tmp << "荔灣區(qū)" << "越秀區(qū)" << "花都區(qū)" << "增城區(qū)";
    map["廣州"] = tmp;

    tmp.clear();
    tmp << "羅湖區(qū)" << "福田區(qū)" << "龍崗區(qū)" << "光明區(qū)";
    map["深圳"] = tmp;

    // 設(shè)置默認(rèn)選擇第4個(gè)
    ui->comboBox_Main->setCurrentIndex(4);
}

// 觸發(fā)子標(biāo)簽填充
void MainWindow::on_comboBox_Main_currentTextChanged(const QString &arg1)
{
    ui->comboBox_SubMain->clear();
    QList<QString> qtmp;

    qtmp = map.value(arg1);
    for(int x=0;x<qtmp.count();x++)
    {
        ui->comboBox_SubMain->addItem(QIcon(":/image/browser alt.ico"),qtmp[x]);
    }
}

// 觸發(fā)按鈕點(diǎn)擊
void MainWindow::on_pushButton_clicked()
{
    QString one = ui->comboBox_Main->currentText();
    QString two = ui->comboBox_SubMain->currentText();
    std::cout << one.toStdString().data() << " | " << two.toStdString().data() << std::endl;
}