How to make QMenu Item checkable in QT - c++

Question

How to give Qmenu item checkable using QT
QMenu *preferenceMenu = new QMenu();
preferenceMenu = editMenu->addMenu(tr("&Preferences"));
QMenu *Mode1 = new QMenu();
Mode1 = preferenceMenu->addMenu(tr("&Mode 1"));
Mode1->addAction(new QAction(tr("&Menu1"), this));
QMenu *Mode2 = new QMenu();
Mode2 = preferenceMenu->addMenu(tr("&Mode 2"));
Mode2->addAction(new QAction(tr("&Menu2"), this));
Mode2->addAction(new QAction(tr("&Menu3"), this));
On QAction I called slot "slotActionTriggered(QAction* actionSelected)"
void csTitleBar::slotActionTriggered(QAction* actionSelected)
{
actionSelected->setChecked(true);
}
How to show small TICK in the selected Menu# so that user can know which is selected
Currently I am able to change to all Menu#, but I need to show a small tick on menu so that the selected one can be easly Identified

Answer 1

Small example:
cmainwindow.h
#ifndef CMAINWINDOW_H
#define CMAINWINDOW_H
#include <QMainWindow>
#include <QPointer>
class CMainWindow : public QMainWindow
{
Q_OBJECT
public:
CMainWindow(QWidget *parent = 0);
~CMainWindow();
private slots:
void slot_SomethingChecked();
private:
QPointer<QAction> m_p_Act_Button1 = nullptr;
QPointer<QAction> m_p_Act_Button2 = nullptr;
};
#endif // CMAINWINDOW_H
cmainwindow.cpp
#include "cmainwindow.h"
#include <QtWidgets>
#include <QDebug>
CMainWindow::CMainWindow(QWidget *parent)
: QMainWindow(parent)
{
m_p_Act_Button1 = new QAction("Super Button 1", this);
m_p_Act_Button1->setCheckable(true);
m_p_Act_Button1->setChecked(true);
connect(m_p_Act_Button1, SIGNAL(triggered()), this, SLOT(slot_SomethingChecked()));
m_p_Act_Button2 = new QAction("Super Button 2", this);
m_p_Act_Button2->setCheckable(true);
m_p_Act_Button2->setChecked(true);
connect(m_p_Act_Button2, SIGNAL(triggered()), this, SLOT(slot_SomethingChecked()));
QMenu *p_menu = menuBar()->addMenu("My Menu");
p_menu->addAction(m_p_Act_Button1);
p_menu->addAction(m_p_Act_Button2);
}
CMainWindow::~CMainWindow() { }
void CMainWindow::slot_SomethingChecked()
{
if(!m_p_Act_Button1 || !m_p_Act_Button2) {return;}
qDebug() << "Hi";
if(m_p_Act_Button1->isChecked())
{
qDebug() << "The action 1 is now checked";
}
else
{
qDebug() << "The action 1 is now unchecked";
}
if(m_p_Act_Button2->isChecked())
{
qDebug() << "The action 2 is now checked";
}
else
{
qDebug() << "The action 2 is now unchecked";
}
}

Answer 2

Modern connection syntax is preferable.
Checkable items can also be used on context menu as follow :
void MyWidget::initContextMenu()
{
if( _contextMenu)
{
delete _contextMenu;
}
_contextMenu = new QMenu(this);
auto action1 = new QAction("Action Item 1", &_contextMenu);
action1->setCheckable(true);
action1->setChecked(getMyProperty1());
connect(action1 , &QAction::triggered, this, &MyWidget::setMyProperty1);
_contextMenu->AddAction( action1 );
}
void MyWidget::contextMenuEvent(QContextMenuEvent *event)
{
initContextMenu();
_contextMenu.popup(
this->viewport()->mapToGlobal(
event->pos()));
}
bool MyWidget::setMyProperty1(bool state)
{
_myProperty1 = state;
emit MyPropertyChanged(_myProperty);
}