仅单击QMenu对象如何执行操作? [英] How to perform action on clicking a QMenu object only?

问题描述

这是GUI的快照.我只想通过单击QMenu对象帮助来执行简单的操作.此QMenu对象没有任何子菜单.

Here's a snapshot of the GUI. I want to perform simple actions solely by clicking on QMenu object Help. This QMenu object does NOT have any submenus.

请问我仅单击QMenu时如何执行操作? 这是我尝试过的方法，但输出为空.

Can you please advise me how to perform actions when only the QMenu is clicked Here's what I have tried, but I got an empty output.

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDebug>
#include <QSignalMapper>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    void createActions();
    QSignalMapper *pSignalMapper;

private slots:
    void help();

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    createActions();
}

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

void MainWindow::createActions()
{
    pSignalMapper = new QSignalMapper(this);
    connect(ui->menuHelp, SIGNAL(triggered(QAction*)), this, SLOT(help()));

}

void MainWindow::help()
{
    qDebug()<<"inside help qdialog";
}

main.cpp

#include "mainwindow.h"
#include <QApplication>
#include <ui_mainwindow.h>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

当我单击帮助" QMenu时，输出，绝对没有:

Output when I click on Help QMenu, absolutely nothing:

Starting E:\Qt2\modules\guiPrototype2\build-guiPrototype2-Desktop_Qt_5_2_0_MSVC2010_32bit-Debug\debug\guiPrototype2.exe...

推荐答案

我会尝试执行以下操作:

I would try to do the following:

void MainWindow::createActions()
{
    [..]
    connect(ui->menuHelp, SIGNAL(aboutToShow()), this, SLOT(help()));
}

void MainWindow::help()
{
    qDebug()<<"inside help qdialog";
}

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