Qt Toolkit - buttongroups/main.cpp example file

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# Buttons and Groupboxes

This examples shows different types of Groupboxes (Buttongroups, etc.) and lots of different kinds of Buttons (Checkboxes, Radiobuttons, Pushbuttons, etc.)

Header file:

    /****************************************************************************
    ** $Id: qt/examples/buttongroups/buttongroups.h   2.3.2   edited 2001-01-26 $
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of an example program for Qt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #ifndef BUTTONS_GROUPS_H
    #define BUTTONS_GROUPS_H

    #include <qwidget.h>

    class QCheckBox;
    class QRadioButton;

    class ButtonsGroups : public QWidget
    {
        Q_OBJECT

    public:
        ButtonsGroups( QWidget *parent = 0, const char *name = 0 );

    protected:
        QCheckBox *state;
        QRadioButton *rb21, *rb22, *rb23;

    protected slots:
        void slotChangeGrp3State();

    };

    #endif

Implementation:

    /****************************************************************************
    ** $Id: qt/examples/buttongroups/buttongroups.cpp   2.3.2   edited 2001-01-26 $
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of an example program for Qt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include "buttongroups.h"

    #include <qbuttongroup.h>
    #include <qlayout.h>
    #include <qradiobutton.h>
    #include <qcheckbox.h>
    #include <qgroupbox.h>
    #include <qpushbutton.h>

    /*
     * Constructor
     *
     * Creates all child widgets of the ButtonGroups window
     */

    ButtonsGroups::ButtonsGroups( QWidget *parent, const char *name )
        : QWidget( parent, name )
    {
        // Create Widgets which allow easy layouting
        QVBoxLayout *vbox = new QVBoxLayout( this );
        QHBoxLayout *box1 = new QHBoxLayout( vbox );
        QHBoxLayout *box2 = new QHBoxLayout( vbox );

        // ------- first group

        // Create an exclusive button group
        QButtonGroup *grp1 = new QButtonGroup( 1, QGroupBox::Horizontal, "Button Group 1 (exclusive)", this);
        box1->addWidget( grp1 );
        grp1->setExclusive( TRUE );

        // insert 3 radiobuttons
        QRadioButton *rb11 = new QRadioButton( "&Radiobutton 1", grp1 );
        rb11->setChecked( TRUE );
        (void)new QRadioButton( "R&adiobutton 2", grp1 );
        (void)new QRadioButton( "Ra&diobutton 3", grp1 );

        // ------- second group

        // Create a non-exclusive buttongroup
        QButtonGroup *grp2 = new QButtonGroup( 1, QGroupBox::Horizontal, "Button Group 2 (non-exclusive)", this );
        box1->addWidget( grp2 );
        grp2->setExclusive( FALSE );

        // insert 3 checkboxes
        (void)new QCheckBox( "&Checkbox 1", grp2 );
        QCheckBox *cb12 = new QCheckBox( "C&heckbox 2", grp2 );
        cb12->setChecked( TRUE );
        QCheckBox *cb13 = new QCheckBox( "Triple &State Button", grp2 );
        cb13->setTristate( TRUE );
        cb13->setChecked( TRUE );

        // ------------ third group

        // create a buttongroup which is exclusive for radiobuttons and non-exclusive for all other buttons
        QButtonGroup *grp3 = new QButtonGroup( 1, QGroupBox::Horizontal, "Button Group 3 (Radiobutton-exclusive)", this );
        box2->addWidget( grp3 );
        grp3->setRadioButtonExclusive( TRUE );

        // insert three radiobuttons
        rb21 = new QRadioButton( "Rad&iobutton 1", grp3 );
        rb22 = new QRadioButton( "Radi&obutton 2", grp3 );
        rb23 = new QRadioButton( "Radio&button 3", grp3 );
        rb23->setChecked( TRUE );

        // insert a checkbox...
        state = new QCheckBox( "E&nable Radiobuttons", grp3 );
        state->setChecked( TRUE );
        // ...and connect its SIGNAL clicked() with the SLOT slotChangeGrp3State()
        connect( state, SIGNAL( clicked() ), this, SLOT( slotChangeGrp3State() ) );

        // ------------ fourth group

        // create a groupbox which layouts its childs in a columns
        QGroupBox *grp4 = new QButtonGroup( 1, QGroupBox::Horizontal, "Groupbox with normal buttons", this );
        box2->addWidget( grp4 );

        // insert two pushbuttons...
        (void)new QPushButton( "&Push Button", grp4 );
        QPushButton *tb = new QPushButton( "&Toggle Button", grp4 );

        // ... and make the second one a toggle button
        tb->setToggleButton( TRUE );
        tb->setOn( TRUE );
    }

    /*
     * SLOT slotChangeGrp3State()
     *
     * enables/disables the radiobuttons of the third buttongroup
     */

    void ButtonsGroups::slotChangeGrp3State()
    {
        rb21->setEnabled( state->isChecked() );
        rb22->setEnabled( state->isChecked() );
        rb23->setEnabled( state->isChecked() );
    }

Main:

    /****************************************************************************
    ** $Id: qt/examples/buttongroups/main.cpp   2.3.2   edited 2001-06-12 $
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of an example program for Qt.  This example
    ** program may be used, distributed and modified without limitation.
    **
    *****************************************************************************/

    #include "buttongroups.h"
    #include <qapplication.h>

    int main( int argc, char **argv )
    {
        QApplication a( argc, argv );

        ButtonsGroups buttonsgroups;
        buttonsgroups.resize( 500, 250 );
        buttonsgroups.setCaption( "Qt Example - Buttongroups" );
        a.setMainWidget( &buttonsgroups );
        buttonsgroups.show();

        return a.exec();
    }