Qt QComboBox 并联实现

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最近学习Qt，用到了两个QComboBox，选择第一个QComboBox后，第二个QComboBox 中只列出与第一项相关的内容。

widget.h 头文件

#ifndef WIDGET_H#define WIDGET_H#include <QWidget>namespace Ui {class Widget;}class Widget : public QWidget{    Q_OBJECTpublic:    explicit Widget(QWidget *parent = 0);    ~Widget();private slots:   void  AttachChose();private:    Ui::Widget *ui;};#endif // WIDGET_H

widget.cpp 文件

#include "widget.h"#include "ui_widget.h"#include <QListView>Widget::Widget(QWidget *parent) :    QWidget(parent),    ui(new Ui::Widget){    ui->setupUi(this);    ui->CollegeCmb->setCurrentIndex(0);    ui->majorCmb->clear();    setStyleSheet("QComboBox { min-height: 20px; min-width: 40px; }"            "QComboBox QAbstractItemView::item { min-height: 20px; min-width: 80px; }");    ui->CollegeCmb->setView(new QListView());    ui->majorCmb->setView(new QListView());    connect(ui->CollegeCmb,SIGNAL(currentIndexChanged(int)),this,SLOT(AttachChose()));}void  Widget::AttachChose(){    int currentIndex=ui->CollegeCmb->currentIndex();    switch (currentIndex) {    case 0:        ui->majorCmb->clear();        break;    case 1:        ui->majorCmb->clear();        ui->majorCmb->addItem(tr("机械工程及自动化专业"));        ui->majorCmb->addItem(tr("机械电子工程"));        ui->majorCmb->addItem(tr("材料成型及控制工程专业"));        ui->majorCmb->addItem(tr("过程装备与控制工程专业"));        break;    case 2:        ui->majorCmb->clear();        ui->majorCmb->addItem(tr("中国语言文学"));        ui->majorCmb->addItem(tr("汉语言文字学"));        ui->majorCmb->addItem(tr("语言学及应用语言学"));        ui->majorCmb->addItem(tr("外国语言文学"));        break;    case 3:        ui->majorCmb->clear();        ui->majorCmb->addItem(tr("计算机科学与技术"));        ui->majorCmb->addItem(tr("软件工程"));        ui->majorCmb->addItem(tr("网络工程"));        ui->majorCmb->addItem(tr("数字媒体技术专业"));        break;    default:        break;    }}Widget::~Widget(){    delete ui;}

main 文件

#include "widget.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    Widget w;    w.show();    return a.exec();}

运行结果如图所示

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