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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt3Support module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "q3mimefactory.h"
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#ifndef QT_NO_MIMEFACTORY
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#include "qmap.h"
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#include "qmime.h"
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#include "qstringlist.h"
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#include "qfileinfo.h"
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#include "qdir.h"
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#include "q3dragobject.h"
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#include "qpixmap.h"
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#include "qimagereader.h"
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#include "q3cleanuphandler.h"
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#include "private/qtextimagehandler_p.h"
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QT_BEGIN_NAMESPACE
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static Q3MimeSourceFactory* defaultfactory = 0;
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static Q3SingleCleanupHandler<Q3MimeSourceFactory> qmime_cleanup_factory;
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class Q3MimeSourceFactoryData {
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public:
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Q3MimeSourceFactoryData() :
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last(0)
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{
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}
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~Q3MimeSourceFactoryData()
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{
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QMap<QString, QMimeSource*>::Iterator it = stored.begin();
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while (it != stored.end()) {
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delete *it;
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++it;
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}
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delete last;
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}
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QMap<QString, QMimeSource*> stored;
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QMap<QString, QString> extensions;
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QStringList path;
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QMimeSource* last;
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QList<Q3MimeSourceFactory*> factories;
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};
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static QImage richTextImageLoader(const QString &name, const QString &context)
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{
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QImage img;
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const QMimeSource *src = Q3MimeSourceFactory::defaultFactory()->data(name, context);
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if (src && Q3ImageDrag::decode(src, img))
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return img;
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return QImage();
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}
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/*!
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\class Q3MimeSourceFactory
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\brief The Q3MimeSourceFactory class is an extensible provider of mime-typed data.
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\compat
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A Q3MimeSourceFactory provides an abstract interface to a
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collection of information. Each piece of information is
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represented by a QMimeSource object which can be examined and
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converted to concrete data types by functions such as
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Q3ImageDrag::canDecode() and Q3ImageDrag::decode().
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The base Q3MimeSourceFactory can be used in two ways: as an
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abstraction of a collection of files or as specifically stored
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data. For it to access files, call setFilePath() before accessing
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data. For stored data, call setData() for each item (there are
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also convenience functions, e.g. setText(), setImage() and
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setPixmap(), that simply call setData() with appropriate
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parameters).
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The rich text widgets, QTextEdit and QTextBrowser, use
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Q3MimeSourceFactory to resolve references such as images or links
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within rich text documents. They either access the default factory
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(see \l{defaultFactory()}) or their own. Other classes that are
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capable of displaying rich text (such as QLabel, QWhatsThis or
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QMessageBox) always use the default factory.
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A factory can also be used as a container to store data associated
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with a name. This technique is useful whenever rich text contains
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images that are stored in the program itself, not loaded from the
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hard disk. Your program may, for example, define some image data
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as:
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\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 0
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To be able to use this image within some rich text, for example
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inside a QLabel, you must create a QImage from the raw data and
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insert it into the factory with a unique name:
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\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 1
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Now you can create a rich text QLabel with
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\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 2
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When no longer needed, you can clear the data from the factory:
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\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 3
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*/
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/*!
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Constructs a Q3MimeSourceFactory that has no file path and no
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stored content.
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*/
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Q3MimeSourceFactory::Q3MimeSourceFactory() :
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d(new Q3MimeSourceFactoryData)
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{
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addFilePath(QLatin1String(":/qt/q3mimesourcefactory/")); //to get from the resources
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// add some reasonable defaults
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setExtensionType(QLatin1String("htm"), "text/html;charset=iso8859-1");
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setExtensionType(QLatin1String("html"), "text/html;charset=iso8859-1");
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setExtensionType(QLatin1String("txt"), "text/plain");
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setExtensionType(QLatin1String("xml"), "text/xml;charset=UTF-8");
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setExtensionType(QLatin1String("jpg"), "image/jpeg"); // support misspelled jpeg files
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}
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/*!
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Destroys the Q3MimeSourceFactory, deleting all stored content.
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*/
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Q3MimeSourceFactory::~Q3MimeSourceFactory()
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{
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if (defaultFactory() == this)
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defaultfactory = 0;
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delete d;
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}
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QMimeSource* Q3MimeSourceFactory::dataInternal(const QString& abs_name, const QMap<QString, QString> &extensions) const
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{
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QMimeSource* r = 0;
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QStringList attempted_names(abs_name);
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QFileInfo fi(abs_name);
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if (fi.isReadable()) {
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// get the right mimetype
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QString e = fi.extension(false);
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QByteArray mimetype("application/octet-stream");
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if (extensions.contains(e))
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mimetype = extensions[e].latin1();
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if (!QImageReader::imageFormat(abs_name).isEmpty())
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mimetype = "application/x-qt-image";
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QFile f(abs_name);
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if (f.open(QIODevice::ReadOnly) && f.size()) {
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QByteArray ba;
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ba.resize(f.size());
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f.readBlock(ba.data(), ba.size());
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Q3StoredDrag* sr = new Q3StoredDrag(mimetype);
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sr->setEncodedData(ba);
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delete d->last;
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d->last = r = sr;
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}
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}
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// we didn't find the mime-source, so ask the default factory for
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// the mime-source (this one will iterate over all installed ones)
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//
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// this looks dangerous, as this dataInternal() function will be
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// called again when the default factory loops over all installed
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// factories (including this), but the static bool looping in
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// data() avoids endless recursions
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if (!r && this != defaultFactory())
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r = (QMimeSource*)defaultFactory()->data(abs_name);
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return r;
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}
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/*!
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Returns a reference to the data associated with \a abs_name. The
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return value remains valid only until the next data() or setData()
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call, so you should immediately decode the result.
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If there is no data associated with \a abs_name in the factory's
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store, the factory tries to access the local filesystem. If \a
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abs_name isn't an absolute file name, the factory will search for
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it in all defined paths (see \l{setFilePath()}).
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The factory understands all the image formats supported by
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QImageReader. Any other mime types are determined by the file name
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extension. The default settings are
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\snippet doc/src/snippets/code/src_qt3support_other_q3mimefactory.cpp 4
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The effect of these is that file names ending in "txt" will be
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treated as text encoded in the local encoding; those ending in
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"xml" will be treated as text encoded in Unicode UTF-8 encoding.
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The text/html type is treated specially, since the encoding can be
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specified in the html file itself. "html" or "htm" will be treated
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as text encoded in the encoding specified by the html meta tag, if
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none could be found, the charset of the mime type will be used.
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The text subtype ("html", "plain", or "xml") does not affect the
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factory, but users of the factory may behave differently. We
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recommend creating "xml" files where practical. These files can be
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viewed regardless of the runtime encoding and can encode any
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Unicode characters without resorting to encoding definitions
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inside the file.
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Any file data that is not recognized will be retrieved as a
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QMimeSource providing the "application/octet-stream" mime type,
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meaning uninterpreted binary data.
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You can add further extensions or change existing ones with
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subsequent calls to setExtensionType(). If the extension mechanism
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is not sufficient for your problem domain, you can inherit
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Q3MimeSourceFactory and reimplement this function to perform some
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more specialized mime-type detection. The same applies if you want
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to use the mime source factory to access URL referenced data over
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a network.
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*/
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const QMimeSource *Q3MimeSourceFactory::data(const QString& abs_name) const
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{
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if (d->stored.contains(abs_name))
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return d->stored[abs_name];
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const QMimeSource *r = 0;
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if (abs_name.isEmpty())
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return r;
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QStringList::Iterator it;
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if (abs_name[0] == QLatin1Char('/')
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#ifdef Q_WS_WIN
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|| (abs_name[0].isLetter() && abs_name[1] == QLatin1Char(':')) || abs_name.startsWith(QLatin1String("\\\\"))
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#endif
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)
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{
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// handle absolute file names directly
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r = dataInternal(abs_name, d->extensions);
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}
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else { // check list of paths
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for (it = d->path.begin(); !r && it != d->path.end(); ++it) {
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QString filename = *it;
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if (filename[(int)filename.length()-1] != QLatin1Char('/'))
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filename += QLatin1Char('/');
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filename += abs_name;
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r = dataInternal(filename, d->extensions);
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}
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}
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static bool looping = false;
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if (!r && this == defaultFactory()) {
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// we found no mime-source and we are the default factory, so
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// we know all the other installed mime-source factories, so
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// ask them
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if (!looping) {
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// to avoid endless recustions, don't enter the loop below
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// if data() got called from within the loop below
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looping = true;
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for (int i = 0; i < d->factories.size(); ++i) {
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const Q3MimeSourceFactory *f = d->factories.at(i);
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if (f == this)
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continue;
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r = static_cast<const QMimeSource *>(f->data(abs_name));
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if (r) {
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looping = false;
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return r;
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}
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}
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looping = false;
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}
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} else if (!r) {
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// we are not the default mime-source factory, so ask the
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// default one for the mime-source, as this one will loop over
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// all installed mime-source factories and ask these
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r = static_cast<const QMimeSource *>(defaultFactory()->data(abs_name));
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}
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return r;
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}
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/*!
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\fn void Q3MimeSourceFactory::setFilePath(const QStringList &path)
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\fn void Q3MimeSourceFactory::setFilePath(const QString &path)
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Sets the list of directories that will be searched when named data
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is requested to those given in the string list \a path.
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\sa filePath()
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*/
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void Q3MimeSourceFactory::setFilePath(const QStringList& path)
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{
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d->path = path;
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}
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/*!
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Returns the currently set search paths.
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*/
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QStringList Q3MimeSourceFactory::filePath() const
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{
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return d->path;
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}
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/*!
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Adds another search path, \a p to the existing search paths.
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\sa setFilePath()
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*/
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void Q3MimeSourceFactory::addFilePath(const QString& p)
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{
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d->path += p;
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}
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/*!
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Sets the mime-type to be associated with the file name extension,
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\a ext to \a mimetype. This determines the mime-type for files
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found via the paths set by setFilePath().
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*/
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void Q3MimeSourceFactory::setExtensionType(const QString& ext, const char* mimetype)
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{
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d->extensions.insert(ext, QLatin1String(mimetype));
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}
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/*!
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Converts the absolute or relative data item name \a
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abs_or_rel_name to an absolute name, interpreted within the
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context (path) of the data item named \a context (this must be an
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absolute name).
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*/
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QString Q3MimeSourceFactory::makeAbsolute(const QString& abs_or_rel_name, const QString& context) const
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{
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if (context.isNull() ||
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!(context[0] == QLatin1Char('/')
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#ifdef Q_WS_WIN
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|| (context[0].isLetter() && context[1] == QLatin1Char(':'))
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#endif
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))
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return abs_or_rel_name;
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if (abs_or_rel_name.isEmpty())
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return context;
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QFileInfo c(context);
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if (!c.isDir()) {
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QFileInfo r(c.dir(true), abs_or_rel_name);
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return r.absFilePath();
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} else {
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QDir d(context);
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QFileInfo r(d, abs_or_rel_name);
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return r.absFilePath();
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}
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}
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/*!
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\overload
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A convenience function. See data(const QString& abs_name). The
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file name is given in \a abs_or_rel_name and the path is in \a
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context.
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*/
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const QMimeSource* Q3MimeSourceFactory::data(const QString& abs_or_rel_name, const QString& context) const
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{
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const QMimeSource* r = data(makeAbsolute(abs_or_rel_name,context));
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if (!r && !d->path.isEmpty())
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r = data(abs_or_rel_name);
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return r;
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}
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/*!
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Sets \a text to be the data item associated with the absolute name
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\a abs_name.
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Equivalent to setData(abs_name, new Q3TextDrag(text)).
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*/
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void Q3MimeSourceFactory::setText(const QString& abs_name, const QString& text)
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{
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setData(abs_name, new Q3TextDrag(text));
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}
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/*!
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Sets \a image to be the data item associated with the absolute
|
|
408 |
name \a abs_name.
|
|
409 |
|
|
410 |
Equivalent to setData(abs_name, new Q3ImageDrag(image)).
|
|
411 |
*/
|
|
412 |
void Q3MimeSourceFactory::setImage(const QString& abs_name, const QImage& image)
|
|
413 |
{
|
|
414 |
setData(abs_name, new Q3ImageDrag(image));
|
|
415 |
}
|
|
416 |
|
|
417 |
/*!
|
|
418 |
Sets \a pixmap to be the data item associated with the absolute
|
|
419 |
name \a abs_name.
|
|
420 |
*/
|
|
421 |
void Q3MimeSourceFactory::setPixmap(const QString& abs_name, const QPixmap& pixmap)
|
|
422 |
{
|
|
423 |
setData(abs_name, new Q3ImageDrag(pixmap.convertToImage()));
|
|
424 |
}
|
|
425 |
|
|
426 |
/*!
|
|
427 |
Sets \a data to be the data item associated with
|
|
428 |
the absolute name \a abs_name. Note that the ownership of \a data is
|
|
429 |
transferred to the factory: do not delete or access the pointer after
|
|
430 |
passing it to this function.
|
|
431 |
|
|
432 |
Passing 0 for data removes previously stored data.
|
|
433 |
*/
|
|
434 |
void Q3MimeSourceFactory::setData(const QString& abs_name, QMimeSource* data)
|
|
435 |
{
|
|
436 |
if (d->stored.contains(abs_name))
|
|
437 |
delete d->stored[abs_name];
|
|
438 |
d->stored.insert(abs_name,data);
|
|
439 |
}
|
|
440 |
|
|
441 |
|
|
442 |
/*!
|
|
443 |
Returns the application-wide default mime source factory. This
|
|
444 |
factory is used by rich text rendering classes such as
|
|
445 |
QSimpleRichText, QWhatsThis and QMessageBox to resolve named
|
|
446 |
references within rich text documents. It serves also as the
|
|
447 |
initial factory for the more complex render widgets, QTextEdit and
|
|
448 |
QTextBrowser.
|
|
449 |
|
|
450 |
\sa setDefaultFactory()
|
|
451 |
*/
|
|
452 |
Q3MimeSourceFactory* Q3MimeSourceFactory::defaultFactory()
|
|
453 |
{
|
|
454 |
if (!defaultfactory)
|
|
455 |
{
|
|
456 |
defaultfactory = new Q3MimeSourceFactory();
|
|
457 |
qmime_cleanup_factory.set(&defaultfactory);
|
|
458 |
QTextImageHandler::externalLoader = richTextImageLoader;
|
|
459 |
}
|
|
460 |
return defaultfactory;
|
|
461 |
}
|
|
462 |
|
|
463 |
/*!
|
|
464 |
Sets the default \a factory, destroying any previously set mime
|
|
465 |
source provider. The ownership of the factory is transferred to
|
|
466 |
Qt.
|
|
467 |
|
|
468 |
\sa defaultFactory()
|
|
469 |
*/
|
|
470 |
void Q3MimeSourceFactory::setDefaultFactory(Q3MimeSourceFactory* factory)
|
|
471 |
{
|
|
472 |
if (!defaultfactory)
|
|
473 |
qmime_cleanup_factory.set(&defaultfactory);
|
|
474 |
else if (defaultfactory != factory)
|
|
475 |
delete defaultfactory;
|
|
476 |
defaultfactory = factory;
|
|
477 |
}
|
|
478 |
|
|
479 |
/*!
|
|
480 |
Sets the defaultFactory() to 0 and returns the previous one.
|
|
481 |
*/
|
|
482 |
|
|
483 |
Q3MimeSourceFactory* Q3MimeSourceFactory::takeDefaultFactory()
|
|
484 |
{
|
|
485 |
Q3MimeSourceFactory *f = defaultfactory;
|
|
486 |
defaultfactory = 0;
|
|
487 |
return f;
|
|
488 |
}
|
|
489 |
|
|
490 |
/*!
|
|
491 |
Adds the Q3MimeSourceFactory \a f to the list of available
|
|
492 |
mimesource factories. If the defaultFactory() can't resolve a
|
|
493 |
data() it iterates over the list of installed mimesource factories
|
|
494 |
until the data can be resolved.
|
|
495 |
|
|
496 |
\sa removeFactory()
|
|
497 |
*/
|
|
498 |
|
|
499 |
void Q3MimeSourceFactory::addFactory(Q3MimeSourceFactory *f)
|
|
500 |
{
|
|
501 |
Q3MimeSourceFactory::defaultFactory()->d->factories.append(f);
|
|
502 |
}
|
|
503 |
|
|
504 |
/*!
|
|
505 |
Removes the mimesource factory \a f from the list of available
|
|
506 |
mimesource factories.
|
|
507 |
|
|
508 |
\sa addFactory()
|
|
509 |
*/
|
|
510 |
|
|
511 |
void Q3MimeSourceFactory::removeFactory(Q3MimeSourceFactory *f)
|
|
512 |
{
|
|
513 |
Q3MimeSourceFactory::defaultFactory()->d->factories.removeAll(f);
|
|
514 |
}
|
|
515 |
|
|
516 |
QPixmap qPixmapFromMimeSource(const QString &abs_name)
|
|
517 |
{
|
|
518 |
const QMimeSource *m = Q3MimeSourceFactory::defaultFactory()->data(abs_name);
|
|
519 |
if (!m) {
|
|
520 |
if (QFile::exists(abs_name))
|
|
521 |
return QPixmap(abs_name);
|
|
522 |
if (!abs_name.isEmpty())
|
|
523 |
qWarning("QPixmap::fromMimeSource: Cannot find pixmap \"%s\" in the mime source factory",
|
|
524 |
abs_name.latin1());
|
|
525 |
return QPixmap();
|
|
526 |
}
|
|
527 |
QPixmap pix;
|
|
528 |
Q3ImageDrag::decode(m, pix);
|
|
529 |
return pix;
|
|
530 |
}
|
|
531 |
|
|
532 |
QImage qImageFromMimeSource(const QString &abs_name)
|
|
533 |
{
|
|
534 |
const QMimeSource *m = Q3MimeSourceFactory::defaultFactory()->data(abs_name);
|
|
535 |
if (!m) {
|
|
536 |
qWarning("QImage::fromMimeSource: Cannot find image \"%s\" in the mime source factory", abs_name.latin1());
|
|
537 |
return QImage();
|
|
538 |
}
|
|
539 |
QImage img;
|
|
540 |
Q3ImageDrag::decode(m, img);
|
|
541 |
return img;
|
|
542 |
}
|
|
543 |
|
|
544 |
QT_END_NAMESPACE
|
|
545 |
|
|
546 |
#endif // QT_NO_MIMEFACTORY
|