QObject::connect: No such signal progressbarV::keyReleaseEvent() - c++

Question

I am trying to create a project in which I have a progressbarV class which creates a QProgressBar. I am calling this class in my mainWindow. My aim is to navigate to another screen when I click on the progressbar. I tried to implement KeyRleaseEvent for this purpose, but no matter what I do, I keep getting the error "QObject::connect: No such signal progressbarV::keyReleaseEvent()". I would much appreciate any help I could get to resolve this issue.
Please find my code below:-
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QWidget>
#include <QProgressBar>
#include <QLabel>
#include <QPixmap>
#include <QPushButton>
#include <QtWidgets>
#include <QProcess>
#include "headerfiles/progressbarV.h"
#include "headerfiles/redzonesettingsscreen.h"
class progressbarH;
class redZoneSettingsScreen;
class MainWindow : public QMainWindow//,public QProcess
{
Q_OBJECT
private:
progressbarV *progressbar_V_left;
public:
MainWindow();
~MainWindow();
void GetObjects(redZoneSettingsScreen *);
private slots:
void handleSettingsButtonPressed();
/*protected:
virtual void keyReleaseEvent(QKeyEvent *); //Q_DECL_OVERRIDE;*/
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "headerfiles/mainwindow.h"
redZoneSettingsScreen *gotoSettingsScreen;
MainWindow::MainWindow()
{
progressbar_V_left = new progressbarV;
progressbar_V_left->setParent(this);
progressbar_V_left->setGeometry(350,200,90,450);
progressbar_V_left->setTitle("Height");
progressbar_V_left->setData(labelCurHeight->getDataValue());
progressbar_V_left->setMinVal(0);
progressbar_V_left->setMaxVal(labelMaxHeight->getDataValue());
connect(progressbar_V_left, SIGNAL (keyReleaseEvent()), this, SLOT
(handleSettingsButtonPressed()));
}
MainWindow::~MainWindow()
{
delete progressbar_V_left;
}
void MainWindow::GetObjects(redZoneSettingsScreen *button)
{
gotoSettingsScreen = button;
}
void MainWindow::handleSettingsButtonPressed()
{
gotoSettingsScreen->hide();
gotoSettingsScreen->show();
this->hide();
}
/*void MainWindow::keyReleaseEvent(QKeyEvent *event)
{
}*/
progressbarV.h
#ifndef PROGRESSBARV_H
#define PROGRESSBARV_H
#include <QWidget>
#include <QProgressBar>
#include <QLabel>
#include <QPixmap>
class progressbarV: public QWidget
{
Q_OBJECT
private:
QProgressBar *progressbar_V;
QLabel *labelRedDanger, *labelYellowWarning;
float maxScaledHeight, redZoneScaledHeight, yellowZoneScaledHeight;
int spn, spn_value;
QString title;
int data;
short minVal;
short maxVal;
public:
progressbarV();
~progressbarV();
void setSPN(int);
int getSPN();
void setSPN_Value(int);
int getSPN_Value();
void setTitle(QString);
QString getTitle();
void setData(int);
int getData();
void setMinVal(short);
short getMinVal();
void setMaxVal(short);
short getMaxVal();
/*void setLowError(short);
short getLowError();
void setLowWarning(short);
short getLowWarning();
void setHighError(short);
short getHighError();
void setHighWarning(short);
short getHighWarning();*/
QProgressBar* getProgressBarV();
protected:
void keyReleaseEvent(QKeyEvent *); //Q_DECL_OVERRIDE;
};
#endif // PROGRESSBARH_H
progressbarV.cpp
#include "headerfiles/progressbarV.h"
progressbarV::progressbarV()
{
progressbar_V = new QProgressBar;
progressbar_V->setParent(this);
progressbar_V->setStyleSheet("QProgressBar{ border: solid grey; border-
width: 6; border-radius: 12; text-align: center;},
QProgressBar::chunk{background-color: limegreen; width: 0px; margin:
0px;}");
progressbar_V->setGeometry(2,0,50,200);
progressbar_V->setOrientation(Qt::Vertical);
maxScaledHeight = (200*100)/120;
redZoneScaledHeight = 200 - ((maxScaledHeight*105)/100);
yellowZoneScaledHeight = 200 - ((maxScaledHeight*90)/100);
QPixmap mypixRed(":/images/images/redZone.png");
labelRedDanger = new QLabel;
labelRedDanger->setParent(this);
labelRedDanger->setGeometry(8,redZoneScaledHeight,38,3);
labelRedDanger->setPixmap(mypixRed);
QPixmap mypixYellow(":/images/images/yellowZone.png");
labelYellowWarning = new QLabel;
labelYellowWarning->setParent(this);
labelYellowWarning->setGeometry(8,yellowZoneScaledHeight,38,3);
labelYellowWarning->setPixmap(mypixYellow);
}
progressbarV::~progressbarV()
{
delete progressbar_V;
delete labelRedDanger;
delete labelYellowWarning;
}
void progressbarV::setSPN(int val)
{
spn = val;
}
int progressbarV::getSPN()
{
return spn;
}
void progressbarV::setSPN_Value(int val)
{
spn_value = val;
}
int progressbarV::getSPN_Value()
{
return spn_value;
}
void progressbarV::setTitle(QString mTitle)
{
title = mTitle;
}
QString progressbarV::getTitle()
{
return title;
}
void progressbarV::setData(int mData)
{
data = mData;
progressbar_V->setValue(data);
}
int progressbarV::getData()
{
return data;
}
void progressbarV::setMinVal(short mMinVal)
{
minVal = mMinVal;
progressbar_V->setMinimum(minVal);
}
short progressbarV::getMinVal()
{
return minVal;
}
void progressbarV::setMaxVal(short mMaxVal)
{
maxVal = mMaxVal;
progressbar_V->setMaximum(maxVal);
}
short progressbarV::getMaxVal()
{
return maxVal;
}
QProgressBar *progressbarV::getProgressBarV()
{
return progressbar_V;
}
void progressbarV::keyReleaseEvent(QKeyEvent *event)
{
}
Since I am new to QT, kindly give me solutions in the form of code snippets
Thanks in advance,
Sam

Answer 1

you need to declare keyReleaseEvent as a public SLOT
public slots:
void keyReleaseEvent(QKeyEvent *); //Q_DECL_OVERRIDE;
so that QT can connect to it using the old connection style.