QT关于QMenu菜单栏

关于使用QT实现菜单栏功能的Demo
具体实现效果如下

代码如下：

#include "widget.h"
#include "ui_widget.h"
#include <QAction>
#include <QFileDialog>
#include <QMenuBar>
#include <QMainWindow>
#include <QDebug>
#include <QStyle>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    CreateMenu();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::CreateMenu()
{
    QStyle *style = QApplication::style();

    QMenu *menu=new QMenu("菜单:常规1");
    QAction *action1=new QAction(QIcon(style->standardIcon(QStyle::SP_ArrowForward)),"action1");
    QAction *action2=new QAction(QIcon(style->standardIcon(QStyle::SP_ArrowForward)),"action2");
    QList<QAction*> list;
    list.append(action1);
    list.append(action2);
    menu->addActions(list);
    QMenuBar *menuBar=new QMenuBar;
    menuBar->addMenu(menu);
    menuBar->addSeparator();    //分隔栏

    connect(action1, &QAction ::triggered, this, [=] (){
            qDebug() << "action1";
        });
    connect(action2, &QAction ::triggered, this, [=] (){
            qDebug() << "action2";
        });


    QMenu *menu2=new QMenu("菜单:常规2");
    QAction *action3=new QAction(QIcon(style->standardIcon(QStyle::SP_ArrowForward)),"action3");
    QAction *action4=new QAction(QIcon(style->standardIcon(QStyle::SP_ArrowForward)),"action4");
    QList<QAction*> list2;
    list2.append(action3);
    list2.append(action4);
    menu2->addActions(list2);
    QMenuBar *menuBar2=new QMenuBar;
    menuBar->addMenu(menu2);
    menuBar->addSeparator();    //分隔栏

    connect(action3, &QAction ::triggered, this, [=] (){
            qDebug() << "action3";
        });
    connect(action4, &QAction ::triggered, this, [=] (){
            qDebug() << "action4";
        });
    ui->gridLayout->addWidget(menuBar);
}

每个action用了信号槽，都有debug输出，具体功能可以自己写。