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<title>Outliner to show use of DOM</title>
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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><?xml version="1.0" encoding="ISO-8859-1"?>
<opml version="1.0">
<head>
<title>Todo List</title>
<dateCreated>Tue, 31 Oct 2000 17:00:17 CET</dateCreated>
<dateModified>Tue, 31 Oct 2000 17:00:17 CET</dateModified>
<ownerName>Arthur Dent</ownerName>
<ownerEmail>info@trolltech.com</ownerEmail>
</head>
<body>
<outline text="Background">
<outline text="This is an example todo list."/>
</outline>
<outline text="Books to read">
<outline text="Science Fiction">
<outline text="Philip K. Dick">
<outline text="Do Androids Dream of Electical Sheep?"/>
<outline text="The Three Stigmata of Palmer Eldritch"/>
</outline>
<outline text="Robert A. Heinlein">
<outline text="Stranger in a Strange Land"/>
</outline>
<outline text="Isaac Asimov">
<outline text="Foundation and Empire"/>
</outline>
</outline>
<outline text="Qt Books (in English)">
<outline text="Blanchette &amp; Summerfield: C++ GUI Programming with Qt 3"/>
<outline text="Dalheimer: Programming with Qt"/>
<outline text="Griffith: KDE 2/Qt Programming Bible"/>
<outline text="Hughes: Linux Rapid Application Development"/>
<outline text="Solin: <a href="qt.html">Qt</a> Programming in 24 hours"/>
<outline text="Ward: <a href="qt.html">Qt</a> 2 Programming for Linux and Windows 2000"/>
</outline>
</outline>
<outline text="Shopping list">
<outline text="General">
<outline text="Towel"/>
<outline text="Hair dryer"/>
<outline text="Underpants"/>
</outline>
<outline text="For Sunday">
<outline text="Beef"/>
<outline text="Rice"/>
<outline text="Carrots"/>
<outline text="Beans"/>
<outline text="Beer"/>
<outline text="Wine"/>
<outline text="Orange juice"/>
</outline>
</outline>
<outline text="Write a letter to Ford">
</outline>
</body>
</opml>
</pre>
<p> <hr>
<p> Header file (outlinetree.h):
<p> <pre>/****************************************************************************
** $Id: qt/outlinetree.h 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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 <<a href="qlistview-h.html">qlistview.h</a>>
#include <<a href="qdom-h.html">qdom.h</a>>
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> &header );
void buildTree( <a href="qlistviewitem.html">QListViewItem</a> *parentItem, const <a href="qdomelement.html">QDomElement</a> &parentElement );
};
#endif // OUTLINETREE_H
</pre>
<p> <hr>
<p> Implementation (outlinetree.cpp):
<p> <pre>/****************************************************************************
** $Id: qt/outlinetree.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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 <<a href="qfile-h.html">qfile.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
<a name="f522"></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="x1915"></a> if ( !opmlFile.<a href="qfile.html#open">open</a>( <a href="qfile.html#open">IO_ReadOnly</a> ) ) {
<a name="x1917"></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( &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="x1914"></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="x1907"></a> node = root.<a href="qdomnode.html#firstChild">firstChild</a>();
<a name="x1909"></a> while ( !node.<a href="qdomnode.html#isNull">isNull</a>() ) {
<a name="x1911"></a><a name="x1908"></a> if ( node.<a href="qdomnode.html#isElement">isElement</a>() && node.<a href="qdomnode.html#nodeName">nodeName</a>() == "head" ) {
<a name="x1913"></a> <a href="qdomelement.html">QDomElement</a> header = node.<a href="qdomnode.html#toElement">toElement</a>();
getHeaderInformation( header );
break;
}
<a name="x1910"></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>() && 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="f523"></a>OutlineTree::getHeaderInformation( const <a href="qdomelement.html">QDomElement</a> &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="x1912"></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="f524"></a>OutlineTree::buildTree( <a href="qlistviewitem.html">QListViewItem</a> *parentItem, const <a href="qdomelement.html">QDomElement</a> &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>() && 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="x1916"></a> thisItem-><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 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. 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 <<a href="qapplication-h.html">qapplication.h</a>>
#include "outlinetree.h"
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
OutlineTree outline( "todos.opml" );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &outline );
<a name="x1920"></a> outline.<a href="qwidget.html#show">show</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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