void MainWindow::initUi()

{

    QActionGroup* toolGroup = new QActionGroup(this);

    toolGroup->addAction(this->ui->drawLine);

    toolGroup->addAction(this->ui->drawCircle);

    toolGroup->addAction(this->ui->drawEllipse);

    toolGroup->addAction(this->ui->selectTool);

    toolGroup->addAction(this->ui->fillPolygon);

    toolGroup->addAction(this->ui->fillFence);

    toolGroup->addAction(this->ui->drawPolygon);

    toolGroup->setExclusionPolicy(QActionGroup::ExclusionPolicy::ExclusiveOptional);

}

#ifndef     MAINWINDOW_H

#define    MAINWINDOW_H

#include  <QMainWindow>

#include  <QMenuBar>

QT_BEGIN_NAMESPACE

namespace Ui { class MainWindow; }

QT_END_NAMESPACE

class  MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    MainWindow(QWidget *parent = nullptr);

    ~MainWindow();

    //菜单栏

    QMenuBar *pMenuBar;

    //菜单项

    QMenu *pMenuTest;

    QMenu *pMenuTest1;

    QMenu *pMenuTest2;

    //子菜单

    QAction *pActionTest;

    QAction *pActionTest1;

    QAction *pActionTest2;

    QAction *pActionTest3;

    QAction *pActionTest4;

    QAction *pActionTest5;

    QAction *pActionTest6;

public slots:

    //菜单响应函数

    void OnActionTest();

    void OnActionTest1();

private:

    Ui::MainWindow *ui;

};

#endif             //MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QDialog>

//是否启用QMainWindow自带的菜单栏

//#define USE_DEFAULT_MENU_BAR

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

    , ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    //指定菜单栏

#ifdef   USE_DEFAULT_MENU_BAR

    //添加菜单栏(此处添加为的为QMainWindow自带的菜单）

    pMenuBar = this->menuBar();

#else

    //添加自定义菜单

    pMenuBar = new QMenuBar(this);

#endif

    //定义菜单项

    //（&n)代表快捷方式，当窗口获得焦点时按alt+n即可打开“测试”菜单项

    pMenuTest = new QMenu("测试(&n)",this);

    pMenuTest1 = new QMenu("test1",this);

    pMenuTest2 = new QMenu("test2",this);

    //定义子菜单

    //（&s）为子菜单快捷键，当打开该菜单项后，按下‘s’键即可响应

    pActionTest = new QAction("测试(&s)",this);

    //新建一个带图标的菜单项，图标使用资源文件中的资源

    pActionTest1 = new QAction(QIcon(":/new/prefix1/resource/soccer_ball.ico"),"测试1",this);

    pActionTest2 = new QAction("测试2",this);

    pActionTest3 = new QAction("测试3(&Y)",this);

    pActionTest4 = new QAction("测试4",this);

    pActionTest5 = new QAction("测试5(&M)",this);

    pActionTest6 = new QAction("测试6",this);

    //将菜单项添加到子菜单

    pMenuTest->addAction(pActionTest);

    pMenuTest->addAction(pActionTest1);

    //在菜单项之间添加分割线

    pMenuTest->addSeparator();

    pMenuTest->addAction(pActionTest2);

    pMenuTest1->addAction(pActionTest3);

    pMenuTest1->addAction(pActionTest4);

    pMenuTest2->addAction(pActionTest5);

    pMenuTest2->addAction(pActionTest6);

    //将子菜单添加到菜单栏

    pMenuBar->addMenu(pMenuTest);

    pMenuBar->addMenu(pMenuTest1);

    pMenuBar->addMenu(pMenuTest2);

#ifndef    USE_DEFAULT_MENU_BAR

    //当不使用QMainWindow自带的菜单栏时，必须要加上此行

    setMenuBar(pMenuBar);

#endif

    //添加菜单响应函数

    connect(pActionTest,&QAction::triggered,this,&MainWindow::OnActionTest);

    connect(pActionTest1,&QAction::triggered,this,&MainWindow::OnActionTest);

}

//菜单响应函数

void MainWindow::OnActionTest()

{

    QDialog  dlg;

    dlg.setWindowTitle("测试菜单响应");

    dlg.exec();

}

void MainWindow::OnActionTest1()

{

    QDialog dlg;

    dlg.setWindowTitle("测试菜单响应");

    dlg.exec();

}

MainWindow::~MainWindow()

{

    delete ui;

}