Mac-4.7.4/src/qt3support/other/q3mimefactory.cpp - platform/external/qt - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the Qt3Support module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser General Public
 ** License version 2.1 as published by the Free Software Foundation and
 ** appearing in the file LICENSE.LGPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU Lesser
 ** General Public License version 2.1 requirements will be met:
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
 ** Other Usage
 ** Alternatively, this file may be used in accordance with the terms and
 ** conditions contained in a signed written agreement between you and Nokia.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "q3mimefactory.h"

 #ifndef QT_NO_MIMEFACTORY

 #include "qmap.h"
 #include "qmime.h"
 #include "qstringlist.h"
 #include "qfileinfo.h"
 #include "qdir.h"
 #include "q3dragobject.h"
 #include "qpixmap.h"
 #include "qimagereader.h"
 #include "q3cleanuphandler.h"
 #include "private/qtextimagehandler_p.h"

 QT_BEGIN_NAMESPACE

 static Q3MimeSourceFactory* defaultfactory = 0;
 static Q3SingleCleanupHandler<Q3MimeSourceFactory> qmime_cleanup_factory;

 class Q3MimeSourceFactoryData {
 public:
     Q3MimeSourceFactoryData() :
         last(0)
     {
     }

     ~Q3MimeSourceFactoryData()
     {
         QMap<QString, QMimeSource*>::Iterator it = stored.begin();
         while (it != stored.end()) {
             delete *it;
             ++it;
         }
         delete last;
     }

     QMap<QString, QMimeSource*> stored;
     QMap<QString, QString> extensions;
     QStringList path;
     QMimeSource* last;
     QList<Q3MimeSourceFactory*> factories;
 };

 static QImage richTextImageLoader(const QString &name, const QString &context)
 {
     QImage img;

     const QMimeSource *src = Q3MimeSourceFactory::defaultFactory()->data(name, context);
     if (src && Q3ImageDrag::decode(src, img))
         return img;

     return QImage();
 }

 /*!
     \class Q3MimeSourceFactory
     \brief The Q3MimeSourceFactory class is an extensible provider of mime-typed data.

     \compat

     A Q3MimeSourceFactory provides an abstract interface to a
     collection of information. Each piece of information is
     represented by a QMimeSource object which can be examined and
     converted to concrete data types by functions such as
     Q3ImageDrag::canDecode() and Q3ImageDrag::decode().

     The base Q3MimeSourceFactory can be used in two ways: as an
     abstraction of a collection of files or as specifically stored
     data. For it to access files, call setFilePath() before accessing
     data. For stored data, call setData() for each item (there are
     also convenience functions, e.g. setText(), setImage() and
     setPixmap(), that simply call setData() with appropriate
     parameters).

     The rich text widgets, QTextEdit and QTextBrowser, use
     Q3MimeSourceFactory to resolve references such as images or links
     within rich text documents. They either access the default factory
     (see \l{defaultFactory()}) or their own. Other classes that are
     capable of displaying rich text (such as QLabel, QWhatsThis or
     QMessageBox) always use the default factory.

     A factory can also be used as a container to store data associated
     with a name. This technique is useful whenever rich text contains
     images that are stored in the program itself, not loaded from the
     hard disk. Your program may, for example, define some image data
     as:
     \snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 0

     To be able to use this image within some rich text, for example
     inside a QLabel, you must create a QImage from the raw data and
     insert it into the factory with a unique name:
     \snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 1

     Now you can create a rich text QLabel with

     \snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 2

     When no longer needed, you can clear the data from the factory:

     \snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 3
 */


 /*!
     Constructs a Q3MimeSourceFactory that has no file path and no
     stored content.
 */
 Q3MimeSourceFactory::Q3MimeSourceFactory() :
     d(new Q3MimeSourceFactoryData)
 {
     addFilePath(QLatin1String(":/qt/q3mimesourcefactory/")); //to get from the resources
     // add some reasonable defaults
     setExtensionType(QLatin1String("htm"), "text/html;charset=iso8859-1");
     setExtensionType(QLatin1String("html"), "text/html;charset=iso8859-1");
     setExtensionType(QLatin1String("txt"), "text/plain");
     setExtensionType(QLatin1String("xml"), "text/xml;charset=UTF-8");
     setExtensionType(QLatin1String("jpg"), "image/jpeg"); // support misspelled jpeg files
 }

 /*!
     Destroys the Q3MimeSourceFactory, deleting all stored content.
 */
 Q3MimeSourceFactory::~Q3MimeSourceFactory()
 {
     if (defaultFactory() == this)
         defaultfactory = 0;
     delete d;
 }

 QMimeSource* Q3MimeSourceFactory::dataInternal(const QString& abs_name, const QMap<QString, QString> &extensions) const
 {
     QMimeSource* r = 0;
     QStringList attempted_names(abs_name);
     QFileInfo fi(abs_name);
     if (fi.isReadable()) {
         // get the right mimetype
         QString e = fi.extension(false);
         QByteArray mimetype("application/octet-stream");
         if (extensions.contains(e))
             mimetype = extensions[e].latin1();
         if (!QImageReader::imageFormat(abs_name).isEmpty())
             mimetype = "application/x-qt-image";

         QFile f(abs_name);
         if (f.open(QIODevice::ReadOnly) && f.size()) {
             QByteArray ba;
             ba.resize(f.size());
             f.readBlock(ba.data(), ba.size());
             Q3StoredDrag* sr = new Q3StoredDrag(mimetype);
             sr->setEncodedData(ba);
             delete d->last;
             d->last = r = sr;
         }
     }

     // we didn't find the mime-source, so ask the default factory for
     // the mime-source (this one will iterate over all installed ones)
     //
     // this looks dangerous, as this dataInternal() function will be
     // called again when the default factory loops over all installed
     // factories (including this), but the static bool looping in
     // data() avoids endless recursions
     if (!r && this != defaultFactory())
         r = (QMimeSource*)defaultFactory()->data(abs_name);

     return r;
 }


 /*!
     Returns a reference to the data associated with \a abs_name. The
     return value remains valid only until the next data() or setData()
     call, so you should immediately decode the result.

     If there is no data associated with \a abs_name in the factory's
     store, the factory tries to access the local filesystem. If \a
     abs_name isn't an absolute file name, the factory will search for
     it in all defined paths (see \l{setFilePath()}).

     The factory understands all the image formats supported by
     QImageReader. Any other mime types are determined by the file name
     extension. The default settings are
     \snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 4
     The effect of these is that file names ending in "txt" will be
     treated as text encoded in the local encoding; those ending in
     "xml" will be treated as text encoded in Unicode UTF-8 encoding.
     The text/html type is treated specially, since the encoding can be
     specified in the html file itself. "html" or "htm" will be treated
     as text encoded in the encoding specified by the html meta tag, if
     none could be found, the charset of the mime type will be used.
     The text subtype ("html", "plain", or "xml") does not affect the
     factory, but users of the factory may behave differently. We
     recommend creating "xml" files where practical. These files can be
     viewed regardless of the runtime encoding and can encode any
     Unicode characters without resorting to encoding definitions
     inside the file.

     Any file data that is not recognized will be retrieved as a
     QMimeSource providing the "application/octet-stream" mime type,
     meaning uninterpreted binary data.

     You can add further extensions or change existing ones with
     subsequent calls to setExtensionType(). If the extension mechanism
     is not sufficient for your problem domain, you can inherit
     Q3MimeSourceFactory and reimplement this function to perform some
     more specialized mime-type detection. The same applies if you want
     to use the mime source factory to access URL referenced data over
     a network.
 */
 const QMimeSource *Q3MimeSourceFactory::data(const QString& abs_name) const
 {
     if (d->stored.contains(abs_name))
         return d->stored[abs_name];

     const QMimeSource *r = 0;
     if (abs_name.isEmpty())
         return r;
     QStringList::Iterator it;
     if (abs_name[0] == QLatin1Char('/')
 #ifdef Q_WS_WIN
             || (abs_name[0].isLetter() && abs_name[1] == QLatin1Char(':')) || abs_name.startsWith(QLatin1String("\\\\"))
 #endif
    )
     {
         // handle absolute file names directly
         r = dataInternal(abs_name, d->extensions);
     }
     else { // check list of paths
         for (it = d->path.begin(); !r && it != d->path.end(); ++it) {
             QString filename = *it;
             if (filename[(int)filename.length()-1] != QLatin1Char('/'))
                 filename += QLatin1Char('/');
             filename += abs_name;
             r = dataInternal(filename, d->extensions);
         }
     }

     static bool looping = false;
     if (!r && this == defaultFactory()) {
         // we found no mime-source and we are the default factory, so
         // we know all the other installed mime-source factories, so
         // ask them
         if (!looping) {
             // to avoid endless recustions, don't enter the loop below
             // if data() got called from within the loop below
             looping = true;
             for (int i = 0; i < d->factories.size(); ++i) {
                 const Q3MimeSourceFactory *f = d->factories.at(i);
                 if (f == this)
                     continue;
                 r = static_cast<const QMimeSource *>(f->data(abs_name));
                 if (r) {
                     looping = false;
                     return r;
                 }
             }
             looping = false;
         }
     } else if (!r) {
         // we are not the default mime-source factory, so ask the
         // default one for the mime-source, as this one will loop over
         // all installed mime-source factories and ask these
         r = static_cast<const QMimeSource *>(defaultFactory()->data(abs_name));
     }
     return r;
 }

 /*!
     \fn void Q3MimeSourceFactory::setFilePath(const QStringList &path)
     \fn void Q3MimeSourceFactory::setFilePath(const QString &path)

     Sets the list of directories that will be searched when named data
     is requested to those given in the string list \a path.

     \sa filePath()
 */
 void Q3MimeSourceFactory::setFilePath(const QStringList& path)
 {
     d->path = path;
 }

 /*!
     Returns the currently set search paths.
 */
 QStringList Q3MimeSourceFactory::filePath() const
 {
     return d->path;
 }

 /*!
     Adds another search path, \a p to the existing search paths.

     \sa setFilePath()
 */
 void Q3MimeSourceFactory::addFilePath(const QString& p)
 {
     d->path += p;
 }

 /*!
     Sets the mime-type to be associated with the file name extension,
     \a ext to \a mimetype. This determines the mime-type for files
     found via the paths set by setFilePath().
 */
 void Q3MimeSourceFactory::setExtensionType(const QString& ext, const char* mimetype)
 {
     d->extensions.insert(ext, QLatin1String(mimetype));
 }

 /*!
     Converts the absolute or relative data item name \a
     abs_or_rel_name to an absolute name, interpreted within the
     context (path) of the data item named \a context (this must be an
     absolute name).
 */
 QString Q3MimeSourceFactory::makeAbsolute(const QString& abs_or_rel_name, const QString& context) const
 {
     if (context.isNull() ||
          !(context[0] == QLatin1Char('/')
 #ifdef Q_WS_WIN
          || (context[0].isLetter() && context[1] == QLatin1Char(':'))
 #endif
           ))
         return abs_or_rel_name;
     if (abs_or_rel_name.isEmpty())
         return context;
     QFileInfo c(context);
     if (!c.isDir()) {
         QFileInfo r(c.dir(true), abs_or_rel_name);
         return r.absFilePath();
     } else {
         QDir d(context);
         QFileInfo r(d, abs_or_rel_name);
         return r.absFilePath();
     }
 }

 /*!
     \overload
     A convenience function. See data(const QString& abs_name). The
     file name is given in \a abs_or_rel_name and the path is in \a
     context.
 */
 const QMimeSource* Q3MimeSourceFactory::data(const QString& abs_or_rel_name, const QString& context) const
 {
     const QMimeSource* r = data(makeAbsolute(abs_or_rel_name,context));
     if (!r && !d->path.isEmpty())
         r = data(abs_or_rel_name);
     return r;
 }


 /*!
     Sets \a text to be the data item associated with the absolute name
     \a abs_name.

     Equivalent to setData(abs_name, new Q3TextDrag(text)).
 */
 void Q3MimeSourceFactory::setText(const QString& abs_name, const QString& text)
 {
     setData(abs_name, new Q3TextDrag(text));
 }

 /*!
     Sets \a image to be the data item associated with the absolute
     name \a abs_name.

     Equivalent to setData(abs_name, new Q3ImageDrag(image)).
 */
 void Q3MimeSourceFactory::setImage(const QString& abs_name, const QImage& image)
 {
     setData(abs_name, new Q3ImageDrag(image));
 }

 /*!
     Sets \a pixmap to be the data item associated with the absolute
     name \a abs_name.
 */
 void Q3MimeSourceFactory::setPixmap(const QString& abs_name, const QPixmap& pixmap)
 {
     setData(abs_name, new Q3ImageDrag(pixmap.convertToImage()));
 }

 /*!
   Sets \a data to be the data item associated with
   the absolute name \a abs_name. Note that the ownership of \a data is
   transferred to the factory: do not delete or access the pointer after
   passing it to this function.

   Passing 0 for data removes previously stored data.
 */
 void Q3MimeSourceFactory::setData(const QString& abs_name, QMimeSource* data)
 {
     if (d->stored.contains(abs_name))
         delete d->stored[abs_name];
     d->stored.insert(abs_name,data);
 }


 /*!
     Returns the application-wide default mime source factory. This
     factory is used by rich text rendering classes such as
     QSimpleRichText, QWhatsThis and QMessageBox to resolve named
     references within rich text documents. It serves also as the
     initial factory for the more complex render widgets, QTextEdit and
     QTextBrowser.

     \sa setDefaultFactory()
 */
 Q3MimeSourceFactory* Q3MimeSourceFactory::defaultFactory()
 {
     if (!defaultfactory)
     {
         defaultfactory = new Q3MimeSourceFactory();
         qmime_cleanup_factory.set(&defaultfactory);
         QTextImageHandler::externalLoader = richTextImageLoader;
     }
     return defaultfactory;
 }

 /*!
     Sets the default \a factory, destroying any previously set mime
     source provider. The ownership of the factory is transferred to
     Qt.

     \sa defaultFactory()
 */
 void Q3MimeSourceFactory::setDefaultFactory(Q3MimeSourceFactory* factory)
 {
     if (!defaultfactory)
         qmime_cleanup_factory.set(&defaultfactory);
     else if (defaultfactory != factory)
         delete defaultfactory;
     defaultfactory = factory;
 }

 /*!
     Sets the defaultFactory() to 0 and returns the previous one.
 */

 Q3MimeSourceFactory* Q3MimeSourceFactory::takeDefaultFactory()
 {
     Q3MimeSourceFactory *f = defaultfactory;
     defaultfactory = 0;
     return f;
 }

 /*!
     Adds the Q3MimeSourceFactory \a f to the list of available
     mimesource factories. If the defaultFactory() can't resolve a
     data() it iterates over the list of installed mimesource factories
     until the data can be resolved.

     \sa removeFactory()
 */

 void Q3MimeSourceFactory::addFactory(Q3MimeSourceFactory *f)
 {
     Q3MimeSourceFactory::defaultFactory()->d->factories.append(f);
 }

 /*!
     Removes the mimesource factory \a f from the list of available
     mimesource factories.

     \sa addFactory()
 */

 void Q3MimeSourceFactory::removeFactory(Q3MimeSourceFactory *f)
 {
     Q3MimeSourceFactory::defaultFactory()->d->factories.removeAll(f);
 }

 QPixmap qPixmapFromMimeSource(const QString &abs_name)
 {
     const QMimeSource *m = Q3MimeSourceFactory::defaultFactory()->data(abs_name);
     if (!m) {
         if (QFile::exists(abs_name))
             return QPixmap(abs_name);
         if (!abs_name.isEmpty())
             qWarning("QPixmap::fromMimeSource: Cannot find pixmap \"%s\" in the mime source factory",
                       abs_name.latin1());
         return QPixmap();
     }
     QPixmap pix;
     Q3ImageDrag::decode(m, pix);
     return pix;
 }

 QImage qImageFromMimeSource(const QString &abs_name)
 {
     const QMimeSource *m = Q3MimeSourceFactory::defaultFactory()->data(abs_name);
     if (!m) {
         qWarning("QImage::fromMimeSource: Cannot find image \"%s\" in the mime source factory", abs_name.latin1());
         return QImage();
     }
     QImage img;
     Q3ImageDrag::decode(m, img);
     return img;
 }

 QT_END_NAMESPACE

 #endif // QT_NO_MIMEFACTORY
	/****************************************************************************
	**
	** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
	** All rights reserved.
	** Contact: Nokia Corporation (qt-info@nokia.com)
	**
	** This file is part of the Qt3Support module of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:LGPL$
	** GNU Lesser General Public License Usage
	** This file may be used under the terms of the GNU Lesser General Public
	** License version 2.1 as published by the Free Software Foundation and
	** appearing in the file LICENSE.LGPL included in the packaging of this
	** file. Please review the following information to ensure the GNU Lesser
	** General Public License version 2.1 requirements will be met:
	** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
	**
	** In addition, as a special exception, Nokia gives you certain additional
	** rights. These rights are described in the Nokia Qt LGPL Exception
	** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
	**
	** GNU General Public License Usage
	** Alternatively, this file may be used under the terms of the GNU General
	** Public License version 3.0 as published by the Free Software Foundation
	** and appearing in the file LICENSE.GPL included in the packaging of this
	** file. Please review the following information to ensure the GNU General
	** Public License version 3.0 requirements will be met:
	** http://www.gnu.org/copyleft/gpl.html.
	**
	** Other Usage
	** Alternatively, this file may be used in accordance with the terms and
	** conditions contained in a signed written agreement between you and Nokia.
	**
	**
	**
	**
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/

	#include "q3mimefactory.h"

	#ifndef QT_NO_MIMEFACTORY

	#include "qmap.h"
	#include "qmime.h"
	#include "qstringlist.h"
	#include "qfileinfo.h"
	#include "qdir.h"
	#include "q3dragobject.h"
	#include "qpixmap.h"
	#include "qimagereader.h"
	#include "q3cleanuphandler.h"
	#include "private/qtextimagehandler_p.h"

	QT_BEGIN_NAMESPACE

	static Q3MimeSourceFactory* defaultfactory = 0;
	static Q3SingleCleanupHandler<Q3MimeSourceFactory> qmime_cleanup_factory;

	class Q3MimeSourceFactoryData {
	public:
	Q3MimeSourceFactoryData() :
	last(0)
	{
	}

	~Q3MimeSourceFactoryData()
	{
	QMap<QString, QMimeSource*>::Iterator it = stored.begin();
	while (it != stored.end()) {
	delete *it;
	++it;
	}
	delete last;
	}

	QMap<QString, QMimeSource*> stored;
	QMap<QString, QString> extensions;
	QStringList path;
	QMimeSource* last;
	QList<Q3MimeSourceFactory*> factories;
	};

	static QImage richTextImageLoader(const QString &name, const QString &context)
	{
	QImage img;

	const QMimeSource *src = Q3MimeSourceFactory::defaultFactory()->data(name, context);
	if (src && Q3ImageDrag::decode(src, img))
	return img;

	return QImage();
	}

	/*!
	\class Q3MimeSourceFactory
	\brief The Q3MimeSourceFactory class is an extensible provider of mime-typed data.

	\compat

	A Q3MimeSourceFactory provides an abstract interface to a
	collection of information. Each piece of information is
	represented by a QMimeSource object which can be examined and
	converted to concrete data types by functions such as
	Q3ImageDrag::canDecode() and Q3ImageDrag::decode().

	The base Q3MimeSourceFactory can be used in two ways: as an
	abstraction of a collection of files or as specifically stored
	data. For it to access files, call setFilePath() before accessing
	data. For stored data, call setData() for each item (there are
	also convenience functions, e.g. setText(), setImage() and
	setPixmap(), that simply call setData() with appropriate
	parameters).

	The rich text widgets, QTextEdit and QTextBrowser, use
	Q3MimeSourceFactory to resolve references such as images or links
	within rich text documents. They either access the default factory
	(see \l{defaultFactory()}) or their own. Other classes that are
	capable of displaying rich text (such as QLabel, QWhatsThis or
	QMessageBox) always use the default factory.

	A factory can also be used as a container to store data associated
	with a name. This technique is useful whenever rich text contains
	images that are stored in the program itself, not loaded from the
	hard disk. Your program may, for example, define some image data
	as:
	\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 0

	To be able to use this image within some rich text, for example
	inside a QLabel, you must create a QImage from the raw data and
	insert it into the factory with a unique name:
	\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 1

	Now you can create a rich text QLabel with

	\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 2

	When no longer needed, you can clear the data from the factory:

	\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 3
	*/


	/*!
	Constructs a Q3MimeSourceFactory that has no file path and no
	stored content.
	*/
	Q3MimeSourceFactory::Q3MimeSourceFactory() :
	d(new Q3MimeSourceFactoryData)
	{
	addFilePath(QLatin1String(":/qt/q3mimesourcefactory/")); //to get from the resources
	// add some reasonable defaults
	setExtensionType(QLatin1String("htm"), "text/html;charset=iso8859-1");
	setExtensionType(QLatin1String("html"), "text/html;charset=iso8859-1");
	setExtensionType(QLatin1String("txt"), "text/plain");
	setExtensionType(QLatin1String("xml"), "text/xml;charset=UTF-8");
	setExtensionType(QLatin1String("jpg"), "image/jpeg"); // support misspelled jpeg files
	}

	/*!
	Destroys the Q3MimeSourceFactory, deleting all stored content.
	*/
	Q3MimeSourceFactory::~Q3MimeSourceFactory()
	{
	if (defaultFactory() == this)
	defaultfactory = 0;
	delete d;
	}

	QMimeSource* Q3MimeSourceFactory::dataInternal(const QString& abs_name, const QMap<QString, QString> &extensions) const
	{
	QMimeSource* r = 0;
	QStringList attempted_names(abs_name);
	QFileInfo fi(abs_name);
	if (fi.isReadable()) {
	// get the right mimetype
	QString e = fi.extension(false);
	QByteArray mimetype("application/octet-stream");
	if (extensions.contains(e))
	mimetype = extensions[e].latin1();
	if (!QImageReader::imageFormat(abs_name).isEmpty())
	mimetype = "application/x-qt-image";

	QFile f(abs_name);
	if (f.open(QIODevice::ReadOnly) && f.size()) {
	QByteArray ba;
	ba.resize(f.size());
	f.readBlock(ba.data(), ba.size());
	Q3StoredDrag* sr = new Q3StoredDrag(mimetype);
	sr->setEncodedData(ba);
	delete d->last;
	d->last = r = sr;
	}
	}

	// we didn't find the mime-source, so ask the default factory for
	// the mime-source (this one will iterate over all installed ones)
	//
	// this looks dangerous, as this dataInternal() function will be
	// called again when the default factory loops over all installed
	// factories (including this), but the static bool looping in
	// data() avoids endless recursions
	if (!r && this != defaultFactory())
	r = (QMimeSource*)defaultFactory()->data(abs_name);

	return r;
	}


	/*!
	Returns a reference to the data associated with \a abs_name. The
	return value remains valid only until the next data() or setData()
	call, so you should immediately decode the result.

	If there is no data associated with \a abs_name in the factory's
	store, the factory tries to access the local filesystem. If \a
	abs_name isn't an absolute file name, the factory will search for
	it in all defined paths (see \l{setFilePath()}).

	The factory understands all the image formats supported by
	QImageReader. Any other mime types are determined by the file name
	extension. The default settings are
	\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 4
	The effect of these is that file names ending in "txt" will be
	treated as text encoded in the local encoding; those ending in
	"xml" will be treated as text encoded in Unicode UTF-8 encoding.
	The text/html type is treated specially, since the encoding can be
	specified in the html file itself. "html" or "htm" will be treated
	as text encoded in the encoding specified by the html meta tag, if
	none could be found, the charset of the mime type will be used.
	The text subtype ("html", "plain", or "xml") does not affect the
	factory, but users of the factory may behave differently. We
	recommend creating "xml" files where practical. These files can be
	viewed regardless of the runtime encoding and can encode any
	Unicode characters without resorting to encoding definitions
	inside the file.

	Any file data that is not recognized will be retrieved as a
	QMimeSource providing the "application/octet-stream" mime type,
	meaning uninterpreted binary data.

	You can add further extensions or change existing ones with
	subsequent calls to setExtensionType(). If the extension mechanism
	is not sufficient for your problem domain, you can inherit
	Q3MimeSourceFactory and reimplement this function to perform some
	more specialized mime-type detection. The same applies if you want
	to use the mime source factory to access URL referenced data over
	a network.
	*/
	const QMimeSource *Q3MimeSourceFactory::data(const QString& abs_name) const
	{
	if (d->stored.contains(abs_name))
	return d->stored[abs_name];

	const QMimeSource *r = 0;
	if (abs_name.isEmpty())
	return r;
	QStringList::Iterator it;
	if (abs_name[0] == QLatin1Char('/')
	#ifdef Q_WS_WIN
	\|\| (abs_name[0].isLetter() && abs_name[1] == QLatin1Char(':')) \|\| abs_name.startsWith(QLatin1String("\\\\"))
	#endif
	)
	{
	// handle absolute file names directly
	r = dataInternal(abs_name, d->extensions);
	}
	else { // check list of paths
	for (it = d->path.begin(); !r && it != d->path.end(); ++it) {
	QString filename = *it;
	if (filename[(int)filename.length()-1] != QLatin1Char('/'))
	filename += QLatin1Char('/');
	filename += abs_name;
	r = dataInternal(filename, d->extensions);
	}
	}

	static bool looping = false;
	if (!r && this == defaultFactory()) {
	// we found no mime-source and we are the default factory, so
	// we know all the other installed mime-source factories, so
	// ask them
	if (!looping) {
	// to avoid endless recustions, don't enter the loop below
	// if data() got called from within the loop below
	looping = true;
	for (int i = 0; i < d->factories.size(); ++i) {
	const Q3MimeSourceFactory *f = d->factories.at(i);
	if (f == this)
	continue;
	r = static_cast<const QMimeSource *>(f->data(abs_name));
	if (r) {
	looping = false;
	return r;
	}
	}
	looping = false;
	}
	} else if (!r) {
	// we are not the default mime-source factory, so ask the
	// default one for the mime-source, as this one will loop over
	// all installed mime-source factories and ask these
	r = static_cast<const QMimeSource *>(defaultFactory()->data(abs_name));
	}
	return r;
	}

	/*!
	\fn void Q3MimeSourceFactory::setFilePath(const QStringList &path)
	\fn void Q3MimeSourceFactory::setFilePath(const QString &path)

	Sets the list of directories that will be searched when named data
	is requested to those given in the string list \a path.

	\sa filePath()
	*/
	void Q3MimeSourceFactory::setFilePath(const QStringList& path)
	{
	d->path = path;
	}

	/*!
	Returns the currently set search paths.
	*/
	QStringList Q3MimeSourceFactory::filePath() const
	{
	return d->path;
	}

	/*!
	Adds another search path, \a p to the existing search paths.

	\sa setFilePath()
	*/
	void Q3MimeSourceFactory::addFilePath(const QString& p)
	{
	d->path += p;
	}

	/*!
	Sets the mime-type to be associated with the file name extension,
	\a ext to \a mimetype. This determines the mime-type for files
	found via the paths set by setFilePath().
	*/
	void Q3MimeSourceFactory::setExtensionType(const QString& ext, const char* mimetype)
	{
	d->extensions.insert(ext, QLatin1String(mimetype));
	}

	/*!
	Converts the absolute or relative data item name \a
	abs_or_rel_name to an absolute name, interpreted within the
	context (path) of the data item named \a context (this must be an
	absolute name).
	*/
	QString Q3MimeSourceFactory::makeAbsolute(const QString& abs_or_rel_name, const QString& context) const
	{
	if (context.isNull() \|\|
	!(context[0] == QLatin1Char('/')
	#ifdef Q_WS_WIN
	\|\| (context[0].isLetter() && context[1] == QLatin1Char(':'))
	#endif
	))
	return abs_or_rel_name;
	if (abs_or_rel_name.isEmpty())
	return context;
	QFileInfo c(context);
	if (!c.isDir()) {
	QFileInfo r(c.dir(true), abs_or_rel_name);
	return r.absFilePath();
	} else {
	QDir d(context);
	QFileInfo r(d, abs_or_rel_name);
	return r.absFilePath();
	}
	}

	/*!
	\overload
	A convenience function. See data(const QString& abs_name). The
	file name is given in \a abs_or_rel_name and the path is in \a
	context.
	*/
	const QMimeSource* Q3MimeSourceFactory::data(const QString& abs_or_rel_name, const QString& context) const
	{
	const QMimeSource* r = data(makeAbsolute(abs_or_rel_name,context));
	if (!r && !d->path.isEmpty())
	r = data(abs_or_rel_name);
	return r;
	}


	/*!
	Sets \a text to be the data item associated with the absolute name
	\a abs_name.

	Equivalent to setData(abs_name, new Q3TextDrag(text)).
	*/
	void Q3MimeSourceFactory::setText(const QString& abs_name, const QString& text)
	{
	setData(abs_name, new Q3TextDrag(text));
	}

	/*!
	Sets \a image to be the data item associated with the absolute
	name \a abs_name.

	Equivalent to setData(abs_name, new Q3ImageDrag(image)).
	*/
	void Q3MimeSourceFactory::setImage(const QString& abs_name, const QImage& image)
	{
	setData(abs_name, new Q3ImageDrag(image));
	}

	/*!
	Sets \a pixmap to be the data item associated with the absolute
	name \a abs_name.
	*/
	void Q3MimeSourceFactory::setPixmap(const QString& abs_name, const QPixmap& pixmap)
	{
	setData(abs_name, new Q3ImageDrag(pixmap.convertToImage()));
	}

	/*!
	Sets \a data to be the data item associated with
	the absolute name \a abs_name. Note that the ownership of \a data is
	transferred to the factory: do not delete or access the pointer after
	passing it to this function.

	Passing 0 for data removes previously stored data.
	*/
	void Q3MimeSourceFactory::setData(const QString& abs_name, QMimeSource* data)
	{
	if (d->stored.contains(abs_name))
	delete d->stored[abs_name];
	d->stored.insert(abs_name,data);
	}


	/*!
	Returns the application-wide default mime source factory. This
	factory is used by rich text rendering classes such as
	QSimpleRichText, QWhatsThis and QMessageBox to resolve named
	references within rich text documents. It serves also as the
	initial factory for the more complex render widgets, QTextEdit and
	QTextBrowser.

	\sa setDefaultFactory()
	*/
	Q3MimeSourceFactory* Q3MimeSourceFactory::defaultFactory()
	{
	if (!defaultfactory)
	{
	defaultfactory = new Q3MimeSourceFactory();
	qmime_cleanup_factory.set(&defaultfactory);
	QTextImageHandler::externalLoader = richTextImageLoader;
	}
	return defaultfactory;
	}

	/*!
	Sets the default \a factory, destroying any previously set mime
	source provider. The ownership of the factory is transferred to
	Qt.

	\sa defaultFactory()
	*/
	void Q3MimeSourceFactory::setDefaultFactory(Q3MimeSourceFactory* factory)
	{
	if (!defaultfactory)
	qmime_cleanup_factory.set(&defaultfactory);
	else if (defaultfactory != factory)
	delete defaultfactory;
	defaultfactory = factory;
	}

	/*!
	Sets the defaultFactory() to 0 and returns the previous one.
	*/

	Q3MimeSourceFactory* Q3MimeSourceFactory::takeDefaultFactory()
	{
	Q3MimeSourceFactory *f = defaultfactory;
	defaultfactory = 0;
	return f;
	}

	/*!
	Adds the Q3MimeSourceFactory \a f to the list of available
	mimesource factories. If the defaultFactory() can't resolve a
	data() it iterates over the list of installed mimesource factories
	until the data can be resolved.

	\sa removeFactory()
	*/

	void Q3MimeSourceFactory::addFactory(Q3MimeSourceFactory *f)
	{
	Q3MimeSourceFactory::defaultFactory()->d->factories.append(f);
	}

	/*!
	Removes the mimesource factory \a f from the list of available
	mimesource factories.

	\sa addFactory()
	*/

	void Q3MimeSourceFactory::removeFactory(Q3MimeSourceFactory *f)
	{
	Q3MimeSourceFactory::defaultFactory()->d->factories.removeAll(f);
	}

	QPixmap qPixmapFromMimeSource(const QString &abs_name)
	{
	const QMimeSource *m = Q3MimeSourceFactory::defaultFactory()->data(abs_name);
	if (!m) {
	if (QFile::exists(abs_name))
	return QPixmap(abs_name);
	if (!abs_name.isEmpty())
	qWarning("QPixmap::fromMimeSource: Cannot find pixmap \"%s\" in the mime source factory",
	abs_name.latin1());
	return QPixmap();
	}
	QPixmap pix;
	Q3ImageDrag::decode(m, pix);
	return pix;
	}

	QImage qImageFromMimeSource(const QString &abs_name)
	{
	const QMimeSource *m = Q3MimeSourceFactory::defaultFactory()->data(abs_name);
	if (!m) {
	qWarning("QImage::fromMimeSource: Cannot find image \"%s\" in the mime source factory", abs_name.latin1());
	return QImage();
	}
	QImage img;
	Q3ImageDrag::decode(m, img);
	return img;
	}

	QT_END_NAMESPACE

	#endif // QT_NO_MIMEFACTORY