Qt Toolkit - richtext/main.cpp example file

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# Richtext

In this examples it's demonstrated how to display rich text, using Qt, in a widget. In this example some sayings taken from the famous Unix "Fortune" are displayed nicely formatted.

Header file:

    /****************************************************************************
    ** $Id: qt/examples/richtext/richtext.h   2.2.0   edited 2000-08-31 $
    **
    ** 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 RICHTEXT_H
    #define RICHTEXT_H

    #include <qvbox.h>

    class QTextView;
    class QPushButton;

    class MyRichText : public QVBox
    {
        Q_OBJECT

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

    protected:
        QTextView *view;
        QPushButton *bClose, *bNext, *bPrev;
        int num;

    protected slots:
        void prev();
        void next();

    };

    #endif

Implementation:

    /****************************************************************************
    ** $Id: qt/examples/richtext/richtext.cpp   2.2.0   edited 2000-08-31 $
    **
    ** 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 "richtext.h"

    #include <qhbox.h>
    #include <qhbox.h>
    #include <qpushbutton.h>
    #include <qtextview.h>
    #include <qbrush.h>
    #include <qapplication.h>

    static const char* sayings[] = {
        "<b>Saying 1:</b><br>"
        "<hr><br><br>"
        "<big>Evil is that which one believes of others.  It is a sin to believe evil "
        "of others, but it is seldom a mistake.</big><br><br>"
        "<center><i>-- H.L. Mencken</i></center>",

        "<b>Saying 2:</b><br>"
        "<hr><br><br>"
        "<big>A well-used door needs no oil on its hinges.<br>"
        "A swift-flowing steam does not grow stagnant.<br>"
        "Neither sound nor thoughts can travel through a vacuum.<br>"
        "Software rots if not used.<br><br>"
        "These are great mysteries.</big><br><br>"
        "<center><i>-- Geoffrey James, \"The Tao of Programming\"</i></center>",

        "<b>Saying 3:</b><br>"
        "<hr><br><br>"
        "<big>Show business is just like high school, except you get paid.</big><br><br>"
        "<center><i>-- Martin Mull</i></center>",

        "<b>Saying 4:</b><br>"
        "<hr><br><br>"
        "<big><b>The Least Successful Executions</b><br>"
        "<twocolumn><p>      History has furnished us with two executioners worthy of attention. "
        "The first performed in Sydney in Australia.  In 1803 three attempts were "
        "made to hang a Mr. Joseph Samuels.  On the first two of these the rope "
        "snapped, while on the third Mr. Samuels just hung there peacefully until he "
        "and everyone else got bored.  Since he had proved unsusceptible to capital "
        "punishment, he was reprieved.</p>"
        "<p>        The most important British executioner was Mr. James Berry who "
        "tried three times in 1885 to hang Mr. John Lee at Exeter Jail, but on each "
        "occasion failed to get the trap door open.<!p>"
        "<p>        In recognition of this achievement, the Home Secretary commuted "
        "Lee's sentence to \"life\" imprisonment.  He was released in 1917, emigrated "
        "to America and lived until 1933.</p></twocolumn></big><br><br>"
        "<center><i>-- Stephen Pile, \"The Book of Heroic Failures\"</i></center>",

        "<b>Saying 5:</b><br>"
        "<hr><br><br>"
        "<big>If you can, help others.  If you can't, at least don't hurt others.</big><br><br>"
        "<center><i>-- the Dalai Lama</i></center>",

        "<b>Saying 6:</b><br>"
        "<hr><br><br>"
        "<big>Television has brought back murder into the home -- where it belongs.</big><br><br>"
        "<center><i>-- Alfred Hitchcock</i></center>",

        "<b>Saying 7:</b><br>"
        "<hr><br><br>"
        "<big>I don't know who my grandfather was; I am much more concerned to know "
        "what his grandson will be.</big><br><br>"
        "<center><i>-- Abraham Lincoln</i></center>",

        0
    };

    MyRichText::MyRichText( QWidget *parent, const char *name )
        : QVBox( parent, name )
    {
        setMargin( 5 );

        view = new QTextView( this );
        view->setText( "This is a <b>Test</b> with <i>italic</i> <u>stuff</u>" );
        QBrush paper;
        paper.setPixmap( QPixmap( "../richtext/marble.png" ) );
        view->setPaper( paper );

        view->setText( sayings[0] );
        view->setMinimumSize( 450, 250 );

        QHBox *buttons = new QHBox( this );
        buttons->setMargin( 5 );

        bClose = new QPushButton( "&Close", buttons );
        bPrev = new QPushButton( "<< &Prev", buttons );
        bNext = new QPushButton( "&Next >>", buttons );

        bPrev->setEnabled( FALSE );

        connect( bClose, SIGNAL( clicked() ), qApp, SLOT( quit() ) );
        connect( bPrev, SIGNAL( clicked() ), this, SLOT( prev() ) );
        connect( bNext, SIGNAL( clicked() ), this, SLOT( next() ) );

        num = 0;
    }

    void MyRichText::prev()
    {
        if ( num <= 0 )
            return;

        num--;

        view->setText( sayings[num] );

        if ( num == 0 )
            bPrev->setEnabled( FALSE );

        bNext->setEnabled( TRUE );
    }

    void MyRichText::next()
    {
        if ( !sayings[++num] )
            return;

        view->setText( sayings[num] );

        if ( !sayings[num + 1] )
            bNext->setEnabled( FALSE );

        bPrev->setEnabled( TRUE );
    }

Main:

    /****************************************************************************
    ** $Id: qt/examples/richtext/main.cpp   2.2.0   edited 2000-08-31 $
    **
    ** 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 "richtext.h"
    #include <qapplication.h>

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

        MyRichText richtext;
        richtext.resize( 450, 350 );
        richtext.setCaption( "Fortune" );
        a.setMainWidget( &richtext );
        richtext.show();

        return a.exec();
    }