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libqt3-devel-3.0.2-2mdk.i586.rpm

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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Outliner to show use of DOM</h1>

 
<p> 
<p> This example presents a small outliner program to show the basic usage of
the <a href="xml.html#dom">DOM classes</a>. The format of the outlines
is the OPML format as described in http://www.opml.org/spec.
<p> This example shows how to load a DOM tree from an XML file and how to
traverse it.
<p> <hr>
<p> Sample XML file (todos.opml):
<p> <pre>&lt;?xml version="1.0" encoding="ISO-8859-1"?&gt;
&lt;opml version="1.0"&gt;
    &lt;head&gt;
        &lt;title&gt;Todo List&lt;/title&gt;
        &lt;dateCreated&gt;Tue, 31 Oct 2000 17:00:17 CET&lt;/dateCreated&gt;
        &lt;dateModified&gt;Tue, 31 Oct 2000 17:00:17 CET&lt;/dateModified&gt;
        &lt;ownerName&gt;Arthur Dent&lt;/ownerName&gt;
        &lt;ownerEmail&gt;info@trolltech.com&lt;/ownerEmail&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;outline text="Background"&gt;
            &lt;outline text="This is an example todo list."/&gt;
        &lt;/outline&gt;
        &lt;outline text="Books to read"&gt;
            &lt;outline text="Science Fiction"&gt;
                &lt;outline text="Philip K. Dick"&gt;
                    &lt;outline text="Do Androids Dream of Electical Sheep?"/&gt;
                    &lt;outline text="The Three Stigmata of Palmer Eldritch"/&gt;
                &lt;/outline&gt;
                &lt;outline text="Robert A. Heinlein"&gt;
                    &lt;outline text="Stranger in a Strange Land"/&gt;
                &lt;/outline&gt;
                &lt;outline text="Isaac Asimov"&gt;
                    &lt;outline text="Foundation and Empire"/&gt;
                &lt;/outline&gt;
            &lt;/outline&gt;
            &lt;outline text="Qt Books (in English)"&gt;
                &lt;outline text="Dalheimer: Programming with Qt"/&gt;
                &lt;outline text="Griffith: KDE 2/Qt Programming Bible"/&gt;
                &lt;outline text="Hughes: Linux Rapid Application Development"/&gt;
                &lt;outline text="Solin: <a href="qt.html">Qt</a> Programming in 24 hours"/&gt;
                &lt;outline text="Ward: <a href="qt.html">Qt</a> 2 Programming for Linux and Windows 2000"/&gt;
            &lt;/outline&gt;
        &lt;/outline&gt;
        &lt;outline text="Shopping list"&gt;
            &lt;outline text="General"&gt;
                &lt;outline text="Towel"/&gt;
                &lt;outline text="Hair dryer"/&gt;
                &lt;outline text="Underpants"/&gt;
            &lt;/outline&gt;
            &lt;outline text="For Sunday"&gt;
                &lt;outline text="Beef"/&gt;
                &lt;outline text="Rice"/&gt;
                &lt;outline text="Carrots"/&gt;
                &lt;outline text="Beans"/&gt;
                &lt;outline text="Beer"/&gt;
                &lt;outline text="Wine"/&gt;
                &lt;outline text="Orange juice"/&gt;
            &lt;/outline&gt;
        &lt;/outline&gt;
        &lt;outline text="Write a letter to Ford"&gt;
        &lt;/outline&gt;
    &lt;/body&gt;
&lt;/opml&gt;
</pre>

<p> <hr>
<p> Header file (outlinetree.h):
<p> <pre>/****************************************************************************
** $Id:  qt/outlinetree.h   3.0.2   edited Oct 12 12:18 $
**
** 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 OUTLINETREE_H
#define OUTLINETREE_H

#include &lt;<a href="qlistview-h.html">qlistview.h</a>&gt;
#include &lt;<a href="qdom-h.html">qdom.h</a>&gt;

class OutlineTree : public <a href="qlistview.html">QListView</a>
{
    <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>

public:
    OutlineTree( const <a href="qstring.html">QString</a> fileName, QWidget *parent = 0, const char *name = 0 );
    ~OutlineTree();

private:
    <a href="qdomdocument.html">QDomDocument</a> domTree;
    void getHeaderInformation( const <a href="qdomelement.html">QDomElement</a> &amp;header );
    void buildTree( <a href="qlistviewitem.html">QListViewItem</a> *parentItem, const <a href="qdomelement.html">QDomElement</a> &amp;parentElement );
};

#endif // OUTLINETREE_H
</pre>

<p> <hr>
<p> Implementation (outlinetree.cpp):
<p> <pre>/****************************************************************************
** $Id:  qt/outlinetree.cpp   3.0.2   edited Oct 12 12:18 $
**
** 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 &lt;<a href="qfile-h.html">qfile.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;

<a name="f150"></a>OutlineTree::OutlineTree( const <a href="qstring.html">QString</a> fileName, QWidget *parent, const char *name )
    : <a href="qlistview.html">QListView</a>( parent, name )
{
    // div. configuration of the list view
    <a href="qlistview.html#addColumn">addColumn</a>( "Outlines" );
    <a href="qlistview.html#setSorting">setSorting</a>( -1 );
    <a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE );

    // read the XML file and create DOM tree
    <a href="qfile.html">QFile</a> opmlFile( fileName );
<a name="x64"></a>    if ( !opmlFile.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_ReadOnly</a> ) ) {
<a name="x66"></a>        QMessageBox::<a href="qmessagebox.html#critical">critical</a>( 0,
                <a href="qobject.html#tr">tr</a>( "Critical Error" ),
                <a href="qobject.html#tr">tr</a>( "Cannot open file %1" ).arg( fileName ) );
        return;
    }
    if ( !domTree.setContent( &amp;opmlFile ) ) {
        QMessageBox::<a href="qmessagebox.html#critical">critical</a>( 0,
                <a href="qobject.html#tr">tr</a>( "Critical Error" ),
                <a href="qobject.html#tr">tr</a>( "Parsing error for file %1" ).arg( fileName ) );
<a name="x63"></a>        opmlFile.<a href="qfile.html#close">close</a>();
        return;
    }
    opmlFile.<a href="qfile.html#close">close</a>();

    // get the header information from the DOM
    <a href="qdomelement.html">QDomElement</a> root = domTree.documentElement();
    <a href="qdomnode.html">QDomNode</a> node;
<a name="x56"></a>    node = root.<a href="qdomnode.html#firstChild">firstChild</a>();
<a name="x58"></a>    while ( !node.<a href="qdomnode.html#isNull">isNull</a>() ) {
<a name="x60"></a><a name="x57"></a>        if ( node.<a href="qdomnode.html#isElement">isElement</a>() &amp;&amp; node.<a href="qdomnode.html#nodeName">nodeName</a>() == "head" ) {
<a name="x62"></a>            <a href="qdomelement.html">QDomElement</a> header = node.<a href="qdomnode.html#toElement">toElement</a>();
            getHeaderInformation( header );
            break;
        }
<a name="x59"></a>        node = node.<a href="qdomnode.html#nextSibling">nextSibling</a>();
    }
    // create the tree view out of the DOM
    node = root.<a href="qdomnode.html#firstChild">firstChild</a>();
    while ( !node.<a href="qdomnode.html#isNull">isNull</a>() ) {
        if ( node.<a href="qdomnode.html#isElement">isElement</a>() &amp;&amp; node.<a href="qdomnode.html#nodeName">nodeName</a>() == "body" ) {
            <a href="qdomelement.html">QDomElement</a> body = node.<a href="qdomnode.html#toElement">toElement</a>();
            buildTree( 0, body );
            break;
        }
        node = node.<a href="qdomnode.html#nextSibling">nextSibling</a>();
    }
}

OutlineTree::~OutlineTree()
{
}

void <a name="f151"></a>OutlineTree::getHeaderInformation( const <a href="qdomelement.html">QDomElement</a> &amp;header )
{
    // visit all children of the header element and look if you can make
    // something with it
    <a href="qdomnode.html">QDomNode</a> node = header.<a href="qdomnode.html#firstChild">firstChild</a>();
    while ( !node.<a href="qdomnode.html#isNull">isNull</a>() ) {
        if ( node.<a href="qdomnode.html#isElement">isElement</a>() ) {
            // case for the different header entries
            if ( node.<a href="qdomnode.html#nodeName">nodeName</a>() == "title" ) {
                <a href="qdomtext.html">QDomText</a> textChild = node.<a href="qdomnode.html#firstChild">firstChild</a>().toText();
                if ( !textChild.<a href="qdomnode.html#isNull">isNull</a>() ) {
<a name="x61"></a>                    <a href="qlistview.html#setColumnText">setColumnText</a>( 0, textChild.<a href="qdomnode.html#nodeValue">nodeValue</a>() );
                }
            }
        }
        node = node.<a href="qdomnode.html#nextSibling">nextSibling</a>();
    }
}

void <a name="f152"></a>OutlineTree::buildTree( <a href="qlistviewitem.html">QListViewItem</a> *parentItem, const <a href="qdomelement.html">QDomElement</a> &amp;parentElement )
{
    <a href="qlistviewitem.html">QListViewItem</a> *thisItem = 0;
    <a href="qdomnode.html">QDomNode</a> node = parentElement.<a href="qdomnode.html#firstChild">firstChild</a>();
    while ( !node.<a href="qdomnode.html#isNull">isNull</a>() ) {
        if ( node.<a href="qdomnode.html#isElement">isElement</a>() &amp;&amp; node.<a href="qdomnode.html#nodeName">nodeName</a>() == "outline" ) {
            // add a new list view item for the outline
            if ( parentItem == 0 )
                thisItem = new <a href="qlistviewitem.html">QListViewItem</a>( this, thisItem );
            else
                thisItem = new <a href="qlistviewitem.html">QListViewItem</a>( parentItem, thisItem );
<a name="x65"></a>            thisItem-&gt;<a href="qlistviewitem.html#setText">setText</a>( 0, node.<a href="qdomnode.html#toElement">toElement</a>().attribute( "text" ) );
            // recursive build of the tree
            buildTree( thisItem, node.<a href="qdomnode.html#toElement">toElement</a>() );
        }
        node = node.<a href="qdomnode.html#nextSibling">nextSibling</a>();
    }
}
</pre>

<p> <hr>
<p> Main (main.cpp):
<p> <pre>/****************************************************************************
** $Id:  qt/main.cpp   3.0.2   edited Oct 12 12:18 $
**
** 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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include "outlinetree.h"

int main( int argc, char **argv )
{
    <a href="qapplication.html">QApplication</a> a( argc, argv );

    OutlineTree outline( "todos.opml" );
<a name="x68"></a>    a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;outline );
    outline.<a href="qwidget.html#show">show</a>();

<a name="x67"></a>    return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>

<p>See also <a href="xml-examples.html">Qt XML Examples</a>.

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<td>Copyright &copy; 2001 
<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.2</div>
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