CODEWITHSUNDEEP
qtsignals-slotsqmenuqaction
cappy0704
cappy0704

Reputation: 567

How to perform action on clicking a QMenu object only?

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.Perform action when Help menu is clicked

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();
}

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...

Upvotes: 7

Views: 21140

Answers (2)

thuga
thuga

Reputation: 12931

The reason it doesn't work, is because you are not triggering any action.

This signal is emitted when an action in a menu belonging to this menubar is triggered as a result of a mouse click; action is the action that caused the signal to be emitted.

What you should do is add an action to your QMenuBar instead of a QMenu.

QAction *helpAction = ui->menuBar->addAction("Help");
connect(helpAction, SIGNAL(triggered()), this, SLOT(help()));

Upvotes: 8

vahancho
vahancho

Reputation: 21248

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";
}

Upvotes: 11

Related Questions