source: trunk/examples/xml/outliner/outlinetree.cpp@ 20

/****************************************************************************
** $Id: outlinetree.cpp 2 2005-11-16 15:49:26Z dmik $
**
** 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 "outlinetree.h"
#include <qfile.h>
#include <qmessagebox.h>

OutlineTree::OutlineTree( const QString fileName, QWidget *parent, const char *name )
    : QListView( parent, name )
{
    // div. configuration of the list view
    addColumn( "Outlines" );
    setSorting( -1 );
    setRootIsDecorated( TRUE );

    // read the XML file and create DOM tree
    QFile opmlFile( fileName );
    if ( !opmlFile.open( IO_ReadOnly ) ) {
        QMessageBox::critical( 0,
                tr( "Critical Error" ),
                tr( "Cannot open file %1" ).arg( fileName ) );
        return;
    }
    if ( !domTree.setContent( &opmlFile ) ) {
        QMessageBox::critical( 0,
                tr( "Critical Error" ),
                tr( "Parsing error for file %1" ).arg( fileName ) );
        opmlFile.close();
        return;
    }
    opmlFile.close();

    // get the header information from the DOM
    QDomElement root = domTree.documentElement();
    QDomNode node;
    node = root.firstChild();
    while ( !node.isNull() ) {
        if ( node.isElement() && node.nodeName() == "head" ) {
            QDomElement header = node.toElement();
            getHeaderInformation( header );
            break;
        }
        node = node.nextSibling();
    }
    // create the tree view out of the DOM
    node = root.firstChild();
    while ( !node.isNull() ) {
        if ( node.isElement() && node.nodeName() == "body" ) {
            QDomElement body = node.toElement();
            buildTree( 0, body );
            break;
        }
        node = node.nextSibling();
    }
}

OutlineTree::~OutlineTree()
{
}

void OutlineTree::getHeaderInformation( const QDomElement &header )
{
    // visit all children of the header element and look if you can make
    // something with it
    QDomNode node = header.firstChild();
    while ( !node.isNull() ) {
        if ( node.isElement() ) {
            // case for the different header entries
            if ( node.nodeName() == "title" ) {
                QDomText textChild = node.firstChild().toText();
                if ( !textChild.isNull() ) {
                    setColumnText( 0, textChild.nodeValue() );
                }
            }
        }
        node = node.nextSibling();
    }
}

void OutlineTree::buildTree( QListViewItem *parentItem, const QDomElement &parentElement )
{
    QListViewItem *thisItem = 0;
    QDomNode node = parentElement.firstChild();
    while ( !node.isNull() ) {
        if ( node.isElement() && node.nodeName() == "outline" ) {
            // add a new list view item for the outline
            if ( parentItem == 0 )
                thisItem = new QListViewItem( this, thisItem );
            else
                thisItem = new QListViewItem( parentItem, thisItem );
            thisItem->setText( 0, node.toElement().attribute( "text" ) );
            // recursive build of the tree
            buildTree( thisItem, node.toElement() );
        }
        node = node.nextSibling();
    }
}