Calling Classes with signal slots like a function

sumit yadav

Hello I am new to Qt creator and also to C++

i have two classes. first is main class in which i have a ui with only a push buttons. second i have another class which add a label and and qlineedit. Now to to call the second class when the puchbutton is clicked. please find below the code

this is mainwindow

 #ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QLayout>
#include <QFormLayout>
#include <QButtonGroup>
#include <QLineEdit>
#include <QRect>
#include <QStyle>
#include <QScrollArea>
#include <QtSql>
#include <QDebug>
#include <QtGui>
#include <QtCore>
#include <QDialog>
#include <QLabel>
#include <QMessageBox>

#include "new_class.h"


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();
    


private:
    Ui::MainWindow *ui;
    QFormLayout* viewLayout;
    new_class* tab_1;
};

#endif // MAINWINDOW_H

.cpp file

#include "mainwindow.h"
#include "ui_mainwindow.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)

{
    ui->setupUi(this);

}

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

void MainWindow::on_pushButton_clicked()
{

 // dont know how to call ???????
}

second call start from here


#ifndef NEW_CLASS_H
#define NEW_CLASS_H

#include <QWidget>
#include <QLineEdit>
#include <QLayout>
#include <QFormLayout>
#include <QButtonGroup>
#include <QRect>
#include <QStyle>
#include <QScrollArea>
#include <QtSql>
#include <QDebug>
#include <QtGui>
#include <QtCore>
#include <QDialog>
#include <QLabel>
#include <QMessageBox>

class new_class : public QWidget
{
    Q_OBJECT
public:
    explicit new_class(QWidget *parent = 0);

signals:

public slots:




private:
    QLineEdit *new_line;
    QFormLayout* viewLayout;
};

#endif // NEW_CLASS_H

second call .cpp file


#include "new_class.h"

new_class::new_class(QWidget *parent) : QWidget(parent)
{

    viewLayout = new QFormLayout(this);
    QWidget* scrollAreaContent = new QWidget(this);
    scrollAreaContent->setLayout( viewLayout );
    QScrollArea* scrollArea = new QScrollArea(this);
    scrollArea->setHorizontalScrollBarPolicy( Qt::ScrollBarAlwaysOff );
    scrollArea->setVerticalScrollBarPolicy( Qt::ScrollBarAsNeeded );
    scrollArea->setWidgetResizable( true );
    scrollArea->setWidget( scrollAreaContent );
    scrollArea->setGeometry(250,250,700,500);
    scrollArea->setEnabled(true);
    scrollArea->show();

    QLabel    *L  = new QLabel("ANYTHING THAT PASS TO IT", this);
    QLineEdit *Q  = new QLineEdit("Just to Check",this);
    L->setBuddy(Q);
    viewLayout->addWidget(L);
    viewLayout->addWidget(Q);
    L->show();
    Q->show();

}

VRonin

Just put a QWidget in your designer, right click on it and promote it to the type new_class. now you can access it through code as any other QWidget, something like ui->myNewClass->