Multi window app with same QMenuBar

kocka

I would like to make 5 QMenu into QMenuBar. Each window have the same menu bar. What would be the best approach?

first.h

#pragma once

#include <QMainWindow>
#include <QMenuBar>
#include "second.h"

QT_BEGIN_NAMESPACE
namespace Ui { class first; }
QT_END_NAMESPACE

class first : public QMainWindow {
    
    Q_OBJECT

public:
    first(QWidget *parent = nullptr);
    ~first();

private slots:
    void changeWindow();

private:
    Ui::first *ui;
    second *sec;

};

first.cpp

#include "first.h"
#include "ui_first.h"

#include <QDebug>

first::first(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::first) {
    ui->setupUi(this);

    QWidget* firstWindow = new QWidget;

        QMenuBar* menu = new QMenuBar(firstWindow);

            QMenu* menuFirst = new QMenu(menu);
            menuFirst->setObjectName("first");
            menuFirst->setTitle("first");

            QMenu* menuSecond = new QMenu(menu);
            menuSecond->setObjectName("second");
            menuSecond->setTitle("second");

            menu->addMenu(menuFirst);
            menu->addMenu(menuSecond);


    sec = new second();

    connect(menuFirst, &QMenu::aboutToShow, this, &first::changeWindow);

    
    setCentralWidget(firstWindow);

}

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

void first::changeWindow() {

    if(sec->isVisible()) {
        sec->hide();
        this->show();
    }
    else {
        this->hide();
        sec->show();
    }
}

With 2 window this is a good, but with 5 or 6 window this is a second-rate solution.

One thing came to mind, create an own menuBar which inherit from QMenuBar and make a function create and that create the menuBar to each window. But maybe there is better solution.

What would be the best to the changeWindow function?

jsulm

@kocka said in Multi window app with same QMenuBar:

QMenuBar* menuBar = new QMenuBar(mainWidget);

Why do you create a QMenuBar manually and why do you put it into QStackedWidget?
Use https://doc.qt.io/qt-5/qmainwindow.html#menuBar to access the menu bar instead.

SGaist

Hi,

Looks like you should take a look at QStackedWidget.

kocka

@SGaist

When I click on a menuBar element, it change the widget.

The issue is that, if I click on a menuBar element, then I click on anywhere on the window, then I could not click on the the menuBar element. ( the menu lost the hoover )

QStackedWidget* mainWidget = new QStackedWidget;

	QWidget* widgetFirst = new QWidget(mainWidget);
	QWidget* widgetSecond = new QWidget(mainWidget);

	mainWidget->addWidget(widgetFirst);
	mainWidget->addWidget(widgetSecond);


	QMenuBar* menuBar = new QMenuBar(mainWidget);
		menuBar->setGeometry(0,0,400,25);

		QMenu* menuFirst = new QMenu(menuBar);
		menuFirst->setObjectName("first");
		menuFirst->setTitle("first");

		QMenu* menuSecond = new QMenu(menuBar);
		menuSecond->setObjectName("second");
		menuSecond->setTitle("second");

		menuBar->addMenu(menuFirst);
		menuBar->addMenu(menuSecond);


QPushButton* pushButton_1 = new QPushButton(widgetFirst);
pushButton_1->setText("widgetFirst");
pushButton_1->setGeometry(300,300,100,100);

QPushButton* pushButton_2 = new QPushButton(widgetSecond);
pushButton_2->setText("widgetSecond");
pushButton_2->setGeometry(200,200,100,100);


connect(menuFirst, &QMenu::aboutToShow, this,
		[=]{first::changeWindow(mainWidget,widgetFirst);});
connect(menuSecond, &QMenu::aboutToShow, this,
		[=]{first::changeWindow(mainWidget,widgetSecond);});


setCentralWidget(mainWidget);

void first::changeWindow(QStackedWidget *w, QWidget* activate) {
    w->setCurrentWidget(activate);
}

jsulm

@kocka said in Multi window app with same QMenuBar:

QMenuBar* menuBar = new QMenuBar(mainWidget);

Why do you create a QMenuBar manually and why do you put it into QStackedWidget?
Use https://doc.qt.io/qt-5/qmainwindow.html#menuBar to access the menu bar instead.

kocka

@jsulm

I use setMenuBar to access to the menu bar and it is working.

setMenuBar(menuBar);