mkdir pokus
cd pokus

kate pokus.cc

qmake -project
qmake
make
./pokus

#include <qapplication.h>
#include <qpushbutton.h>
#include <qslider.h>
#include <qlcdnumber.h>
#include <qfont.h>
 
#include <qvbox.h>
 
class MyWidget : public QVBox
{
Q_OBJECT
public:
    MyWidget( QWidget *parent=0, const char *name=0 );
private:
   QPushButton * quit;
public slots:
   void stisknuto ();
};
 
#include "pokus.moc"
 
void MyWidget::stisknuto ()
{
    quit->setText ("ABC");
}
 
MyWidget::MyWidget( QWidget *parent, const char *name )
        : QVBox( parent, name )
{
    quit = new QPushButton( "Knoflik", this, "quit" );
    quit->setFont( QFont( "Times", 18, QFont::Bold ) );
 
    connect( quit, SIGNAL(clicked()), this, SLOT(stisknuto()) );
 
    QLCDNumber *lcd  = new QLCDNumber( 2, this, "lcd" );
 
    QSlider * slider = new QSlider( Horizontal, this, "slider" );
    slider->setRange( 0, 99 );
    slider->setValue( 0 );
 
    connect( slider, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)) );
}
 
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
 
    MyWidget w;
    a.setMainWidget( &w );
    w.show();
    return a.exec();
}

#include <iostream>
#include <qapplication.h>
#include <qpushbutton.h>
#include <qvbox.h>
#include <qhbox.h>
#include <qvaluevector.h>
#include <qtextedit.h>
 
using namespace std; 
 
class MyButton;
 
class MyWidget : public QWidget
{
Q_OBJECT
public:
    MyWidget ( QWidget *parent=0, const char *name=0 );
private:
    QPushButton * button;
    QValueVector < MyButton * > knofliky;
    QTextEdit * edit;
public slots:
    void abc ();
    void vypis ();
    // void def ();
    // void klm (int i);
};
 
class MyButton : public QPushButton
{
Q_OBJECT
public:
    MyButton ( const char *text, QWidget *parent=0, const char *name=0 );
public slots:
    void stisknuto ();
};
 
#include "pokus.moc"
 
void MyButton::stisknuto ()
{
    setText ("Click");
    setGeometry (100, 10, 70, 20);
}
 
MyButton::MyButton ( const char *text, QWidget *parent, const char *name )
   : QPushButton( text, parent, name )
{
}
 
void MyWidget::abc ()
{
    button->setText ("Stiknuto");
    setBackgroundColor(QColor (200, 128, 100));
 
    MyButton * p = new MyButton ("Knoflik", this);
    knofliky.push_back (p);
    p->show ();
    connect( p, SIGNAL(clicked()), p, SLOT(stisknuto ()) );
 
    // ( new QPushButton ("Knoflik", this) ) ->show ();
}
 
void MyWidget::vypis ()
{
    edit->setText ("");
    cout << "Seznam knofliku" << endl;
    for (int i = 0; i < knofliky.size (); i++)
    {
      cout << "knoflik " << i << " " << knofliky[i]->text () << endl;
      edit->append (QString ("knoflik ") + QString::number (i) + " " + knofliky[i]->text ());
    }
}
 
 
MyWidget::MyWidget( QWidget *parent, const char *name )
        : 
          QWidget( parent, name ),
          button (NULL)
{
    setMinimumSize( 200, 120 );
    // setMaximumSize( 400, 240 );
    setBackgroundColor(QColor (128, 128, 255));
 
    button = new QPushButton( "Quit", this, "quit" );
    button->setGeometry( 62, 40, 120, 30 );
    button->setFont( QFont( "Times", 18, QFont::Bold ) );
 
    connect( button, SIGNAL(clicked()), this, SLOT(abc ()) );
 
    QPushButton * b = new QPushButton( "List", this);
    b->setGeometry( 62, 80, 120, 30 );
    connect( b, SIGNAL(clicked()), this, SLOT(vypis ()) );
 
    edit = new QTextEdit (this);
    edit->setGeometry( 62, 120, 200, 200 );
}
 
 
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
 
    MyWidget w;
    w.setGeometry( 100, 100, 200, 120 );
    a.setMainWidget( &w );
 
    w.show();
    return a.exec();
}