Qt Catching signal of checkbox to do an action - c++

Question

In my Qt program, I want to catch the signal of one of my checkbox to know if it's checked or not. I did it :
#include <iostream>
#include <QVBoxLayout>
#include <QtGui>
#include "Window.h"
Window::Window() : QWidget()
{
setFixedSize(400, 800);
m_bouton = new QPushButton("Module 1");
m_bouton->setCursor(Qt::PointingHandCursor);
m_bouton2 = new QPushButton("Module 2");
m_bouton2->setCursor(Qt::PointingHandCursor);
m_bouton3 = new QPushButton("Module 3");
m_bouton3->setCursor(Qt::PointingHandCursor);
m_bouton4 = new QPushButton("Module 4");
m_bouton4->setCursor(Qt::PointingHandCursor);
m_check4 = new QCheckBox(this);
m_check4->move(300, 50);
m_check4->setChecked(true);
m_check3 = new QCheckBox(this);
m_check3->move(200, 50);
m_check3->setChecked(true);
m_check2 = new QCheckBox(this);
m_check2->move(100, 50);
m_check2->setChecked(true);
m_check1 = new QCheckBox(this);
m_check1->move(0, 50);
m_check1->setChecked(true);
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(m_bouton);
layout->addWidget(m_bouton2);
layout->addWidget(m_bouton3);
layout->addWidget(m_bouton4);
this->setLayout(layout);
this->setStyleSheet("border: 1px solid black; border-radius: 10px;");
this->setWindowOpacity(0.5);
QWidget::setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint);
QWidget::setWindowTitle("Monitor Core");
QObject::connect(m_bouton4, SIGNAL(clicked()), this, SLOT(SizeCHange()));
QObject::connect(m_check4, SIGNAL(clicked()), this, SLOT(SizeCHange()));
}
void Window::SizeCHange()
{
setFixedSize(400, 800 - 200);
m_bouton4->setVisible(false);
}
and this is my .h :
#ifndef _WINDOW_H_
#define _WINDOW_H_
#include <QApplication>
#include <QWidget>
#include <QPushButton>
#include <QCheckBox>
class Window : public QWidget
{
Q_OBJECT
public:
Window();
public slots:
void SizeCHange();
private:
QPushButton *m_bouton;
QPushButton *m_bouton2;
QPushButton *m_bouton3;
QPushButton *m_bouton4;
QCheckBox *m_check1;
QCheckBox *m_check2;
QCheckBox *m_check3;
QCheckBox *m_check4;
};
#endif
This is working but just one time. I want to know if it's check or not, then I will be able to resize my window and make something invisible as I want.

Answer 1

You simply need to use a bool parameter, which indicates the state of the checkbox:
public slots:
void SizeCHange(bool checked); //using bool parameter
//...
QObject::connect(m_check4, SIGNAL(clicked(bool)), this, SLOT(SizeCHange(bool)));
//...
void Window::SizeCHange(bool checked)
{
if(checked)
{
setFixedSize(400, 800 - 200);
}
else
{
// removing fixed size
setMinimumSize(QSize(0, 0));
setMaximumSize(QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX));
}
m_bouton4->setVisible(checked);
}
The docs for a signal clicked()