how to connect a QRadioButton to a QTabWidget??

Question

i am creating a software using C++ and QT,and i have two widget one of type QRadioButon and one QTabWidget. My need is that i want to send signal from a radio button and i want that whenever the button is checked the content of tab get changed. Can anyone suggest how to do that? I tried creating a slot of my widget class and in that slot i called the constructor of tab class but the problem is the construtor is not getting called. here is the code i am using..

#include <QtGui>
#include "v_lab.h"

v_lab::v_lab(QWidget *parent)
    :QDialog(parent)
{

    setWindowTitle("Virtual Lab");
    maingroup=new QGroupBox(this);
    maingroup->setTitle("Algorithms");
    maingroup->setMinimumWidth(200);
    maingroup->setMaximumWidth(240);
    maingroup->setFlat(false);
    p=new QPalette;
            p->setColor(QPalette::Background,QColor(233,212,102));
            setPalette(*p);  


             box=new QGroupBox(maingroup);
         box->setFlat(false);
             box->setTitle("Searching Algorithm");




          linear_search=new QRadioButton("Linear Search",box);
          linear_search->setChecked(1);
           binary_search=new QRadioButton("Binary Search",box);


          box1=new QGroupBox(maingroup);
         box1->setFlat(false);
            box1->setTitle("Sorting Algorithms");


          bubble_sort=new QRadioButton("Bubble Sort",box1);
           selection_sort=new QRadioButton("Selection Sort",box1);


        box2=new QGroupBox(maingroup);
            box2->setFlat(false);
            box2->setTitle("Tree Algorithms");


         infix_traversal=new QRadioButton("Infix Traversal",box2);
           prefix_traversal=new QRadioButton("Prefix Traversal",box2);
           postfix_traversal=new QRadioButton("Postfix Traversal",box2);



           box3=new QGroupBox(maingroup);
              box3->setFlat(false);
            box3->setTitle("Graph Algorithms");


          bfs=new QRadioButton("BFS",box3);

           dfs=new QRadioButton("DFS",box3);
           shortest_path=new QRadioButton("Shortest Path",box3);

           QString string1="go to hell";
           tab=new QTabWidget;
           tab->addTab(new algorithm(string1),"Algorithm");
           //tab->addTab(new psudo_code(),"Pseduo-Code");
           tab->setMinimumWidth(250);
           tab->setMaximumWidth(400);




           //Layout
           mainlayout=new QHBoxLayout(this);
           mainlayout->addWidget(maingroup);

           mainlayout->addWidget(tab);
           mainlayout->addStretch();
           main_left_pane_layout=new QVBoxLayout(maingroup);

           main_left_pane_layout->addWidget(box);
           main_left_pane_layout->addWidget(box1);
           main_left_pane_layout->addWidget(box2);
           main_left_pane_layout->addWidget(box3);

           left_pane_box=new QVBoxLayout(box);

           left_pane_box->addWidget(linear_search);
           left_pane_box->addWidget(binary_search);


           left_pane_box1=new QVBoxLayout(box1);

           left_pane_box1->addWidget(bubble_sort);
           left_pane_box1->addWidget(selection_sort);

           left_pane_box2=new QVBoxLayout(box2);

           left_pane_box2->addWidget(infix_traversal);
           left_pane_box2->addWidget(prefix_traversal);
           left_pane_box2->addWidget(postfix_traversal);

    left_pane_box3=new QVBoxLayout(box3);

    left_pane_box3->addWidget(bfs);
    left_pane_box3->addWidget(dfs);
    left_pane_box3->addWidget(shortest_path);


    connect(binary_search,SIGNAL(clicked()),this,SLOT(peeyush()));
}

algorithm::algorithm(const QString &string,QWidget *parent)
    :QWidget(parent)
{
           label=new QLabel(string);
           main_layout=new QVBoxLayout;
           main_layout->addWidget(label);
           main_layout->addStretch();
           setLayout(main_layout);

}
/*  psudo_code::psudo_code(QWidget *parent)
    :QWidget(parent)
{
    label1=new QLabel("Hello Peeyush Chandel");
    main_layout1=new QVBoxLayout;
    main_layout1->addWidget(label1);
    main_layout1->addStretch();
    setLayout(main_layout1);

}*/



void v_lab::peeyush()
{
    QString string1="new string";
  algorithm obj(string1);
    //exit(1);
}

Answer 1

In the header definition file of your v_lab class you should have something like this:

// includes here
class v_lab: public QDialog{
    Q_OBJECT // VERY important!

    // Other things here.

    private slots: // VERY important. You can use public slots too.
        void peeyush();
}

And you cannot connect a signal to a constructor.

Answer 2

This problem has been solved.Thanks to them who tried.