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();

??? //菜單欄

??? QMenuBar *pMenuBar;

??? //菜單項

??? QMenu *pMenuTest;

??? QMenu *pMenuTest1;

??? QMenu *pMenuTest2;

??? //子菜單

??? QAction *pActionTest;

??? QAction *pActionTest1;

??? QAction *pActionTest2;

??? QAction *pActionTest3;

??? QAction *pActionTest4;

??? QAction *pActionTest5;

??? QAction *pActionTest6;

public slots:

?? ?//菜單響應函數

??? void OnActionTest();

??? void OnActionTest1();

private:

??? Ui::MainWindow *ui;

};

#endif ????????????//MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QDialog>

//是否啟用QMainWindow自帶的菜單欄

//#define USE_DEFAULT_MENU_BAR

MainWindow::MainWindow(QWidget *parent)

??? : QMainWindow(parent)

??? , ui(new Ui::MainWindow)

{

??? ui->setupUi(this);

??? //指定菜單欄

#ifdef ??USE_DEFAULT_MENU_BAR

??? //添加菜單欄(此處添加為的為QMainWindow自帶的菜單）

??? pMenuBar = this->menuBar();

#else

??? //添加自定義菜單

??? pMenuBar = new QMenuBar(this);

#endif

??? //定義菜單項

??? //（&n)代表快捷方式，當窗口獲得焦點時按alt+n即可打開“測試”菜單項

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

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

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

??? //定義子菜單

??? //（&s）為子菜單快捷鍵，當打開該菜單項后，按下‘s’鍵即可響應

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

?? ?//新建一個帶圖標的菜單項，圖標使用資源文件中的資源

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

??? pActionTest2 = new QAction("測試2",this);

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

??? pActionTest4 = new QAction("測試4",this);

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

??? pActionTest6 = new QAction("測試6",this);

??? //將菜單項添加到子菜單

??? pMenuTest->addAction(pActionTest);

??? pMenuTest->addAction(pActionTest1);

?? ?//在菜單項之間添加分割線

??? pMenuTest->addSeparator();

??? pMenuTest->addAction(pActionTest2);

??? pMenuTest1->addAction(pActionTest3);

??? pMenuTest1->addAction(pActionTest4);

??? pMenuTest2->addAction(pActionTest5);

??? pMenuTest2->addAction(pActionTest6);

??? //將子菜單添加到菜單欄

??? pMenuBar->addMenu(pMenuTest);

??? pMenuBar->addMenu(pMenuTest1);

??? pMenuBar->addMenu(pMenuTest2);

#ifndef ???USE_DEFAULT_MENU_BAR

?? ?//當不使用QMainWindow自帶的菜單欄時，必須要加上此行

??? setMenuBar(pMenuBar);

#endif

??? //添加菜單響應函數

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

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

}

//菜單響應函數

void MainWindow::OnActionTest()

{

??? QDialog ?dlg;

??? dlg.setWindowTitle("測試菜單響應");

??? dlg.exec();

}

void MainWindow::OnActionTest1()

{

??? QDialog dlg;

??? dlg.setWindowTitle("測試菜單響應");

??? dlg.exec();

}

MainWindow::~MainWindow()

{

??? delete ui;

}