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qt3/src/kernel/qmime.cpp

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/****************************************************************************
**
** Implementation of MIME support
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qmime.h"
#ifndef QT_NO_MIME
#include "qmap.h"
#include "qstringlist.h"
#include "qfileinfo.h"
#include "qdir.h"
#include "qdragobject.h"
#include "qcleanuphandler.h"
#include "qapplication.h" // ### for now
#include "qclipboard.h" // ### for now
/*!
\class QMimeSource qmime.h
\brief The QMimeSource class is an abstraction of objects which provide formatted data of a certain MIME type.
\ingroup io
\ingroup draganddrop
\ingroup misc
\link dnd.html Drag-and-drop\endlink and
\link QClipboard clipboard\endlink use this abstraction.
\sa \link http://www.isi.edu/in-notes/iana/assignments/media-types/
IANA list of MIME media types\endlink
*/
static int qt_mime_serial_number = 0;
static QMimeSourceFactory* defaultfactory = 0;
static QSingleCleanupHandler<QMimeSourceFactory> qmime_cleanup_factory;
/*!
Constructs a mime source and assigns a globally unique serial
number to it.
\sa serialNumber()
*/
QMimeSource::QMimeSource()
{
ser_no = qt_mime_serial_number++;
cacheType = NoCache;
}
/*!
\fn int QMimeSource::serialNumber() const
Returns the mime source's globally unique serial number.
*/
void QMimeSource::clearCache()
{
if ( cacheType == Text ) {
delete cache.txt.str;
delete cache.txt.subtype;
cache.txt.str = 0;
cache.txt.subtype = 0;
} else if ( cacheType == Graphics ) {
delete cache.gfx.img;
delete cache.gfx.pix;
cache.gfx.img = 0;
cache.gfx.pix = 0;
}
cacheType = NoCache;
}
/*!
Provided to ensure that subclasses destroy themselves correctly.
*/
QMimeSource::~QMimeSource()
{
#ifndef QT_NO_CLIPBOARD
extern void qt_clipboard_cleanup_mime_source(QMimeSource *);
qt_clipboard_cleanup_mime_source(this);
#endif
clearCache();
}
/*!
\fn QByteArray QMimeSource::encodedData(const char*) const
Returns the encoded data of this object in the specified MIME
format.
Subclasses must reimplement this function.
*/
/*!
Returns TRUE if the object can provide the data in format \a
mimeType; otherwise returns FALSE.
If you inherit from QMimeSource, for consistency reasons it is
better to implement the more abstract canDecode() functions such
as QTextDrag::canDecode() and QImageDrag::canDecode().
*/
bool QMimeSource::provides(const char* mimeType) const
{
const char* fmt;
for (int i=0; (fmt = format(i)); i++) {
if ( !qstricmp(mimeType,fmt) )
return TRUE;
}
return FALSE;
}
/*!
\fn const char * QMimeSource::format(int i) const
Returns the \a{i}-th supported MIME format, or 0.
*/
class QMimeSourceFactoryData {
public:
QMimeSourceFactoryData() :
last(0)
{
}
~QMimeSourceFactoryData()
{
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;
QPtrList<QMimeSourceFactory> factories;
};
/*!
\class QMimeSourceFactory qmime.h
\brief The QMimeSourceFactory class is an extensible provider of mime-typed data.
\ingroup io
\ingroup environment
A QMimeSourceFactory 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
QImageDrag::canDecode() and QImageDrag::decode().
The base QMimeSourceFactory 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
QMimeSourceFactory to resolve references such as images or links
within rich text documents. They either access the default factory
(see \l{defaultFactory()}) or their own (see
\l{QTextEdit::setMimeSourceFactory()}). 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:
\code
static const char* myimage_data[]={
"...",
...
"..."};
\endcode
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:
\code
QMimeSourceFactory::defaultFactory()->setImage( "myimage", QImage(myimage_data) );
\endcode
Now you can create a rich text QLabel with
\code
QLabel* label = new QLabel(
"Rich text with embedded image:<img source=\"myimage\">"
"Isn't that <em>cute</em>?" );
\endcode
When no longer needed, you can clear the data from the factory:
\code
delete label;
QMimeSourceFactory::defaultFactory()->setData( "myimage", 0 );
\endcode
*/
/*!
Constructs a QMimeSourceFactory that has no file path and no
stored content.
*/
QMimeSourceFactory::QMimeSourceFactory() :
d(new QMimeSourceFactoryData)
{
// add some reasonable defaults
setExtensionType("htm", "text/html;charset=iso8859-1");
setExtensionType("html", "text/html;charset=iso8859-1");
setExtensionType("txt", "text/plain");
setExtensionType("xml", "text/xml;charset=UTF-8");
setExtensionType("jpg", "image/jpeg"); // support misspelled jpeg files
}
/*!
Destroys the QMimeSourceFactory, deleting all stored content.
*/
QMimeSourceFactory::~QMimeSourceFactory()
{
if ( defaultFactory() == this )
defaultfactory = 0;
delete d;
}
QMimeSource* QMimeSourceFactory::dataInternal(const QString& abs_name, const QMap<QString, QString> &extensions ) const
{
QMimeSource* r = 0;
QFileInfo fi(abs_name);
if ( fi.isReadable() ) {
// get the right mimetype
QString e = fi.extension(FALSE);
QCString mimetype = "application/octet-stream";
const char* imgfmt;
if ( extensions.contains(e) )
mimetype = extensions[e].latin1();
else if ( ( imgfmt = QImage::imageFormat( abs_name ) ) )
mimetype = QCString("image/")+QCString(imgfmt).lower();
QFile f(abs_name);
if ( f.open(IO_ReadOnly) && f.size() ) {
QByteArray ba(f.size());
f.readBlock(ba.data(), ba.size());
QStoredDrag* sr = new QStoredDrag( 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
QImageIO. Any other mime types are determined by the file name
extension. The default settings are
\code
setExtensionType("html", "text/html;charset=iso8859-1");
setExtensionType("htm", "text/html;charset=iso8859-1");
setExtensionType("txt", "text/plain");
setExtensionType("xml", "text/xml;charset=UTF-8");
\endcode
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
QMimeSourceFactory 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* QMimeSourceFactory::data(const QString& abs_name) const
{
if ( d->stored.contains(abs_name) )
return d->stored[abs_name];
QMimeSource* r = 0;
QStringList::Iterator it;
if ( abs_name[0] == '/'
#ifdef Q_WS_WIN
|| ( abs_name[0] && abs_name[1] == ':' ) || abs_name.startsWith("\\\\")
#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] != '/' )
filename += '/';
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;
QPtrListIterator<QMimeSourceFactory> it( d->factories );
QMimeSourceFactory *f;
while ( ( f = it.current() ) ) {
++it;
if ( f == this )
continue;
r = (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 = (QMimeSource*)defaultFactory()->data( abs_name );
}
return r;
}
/*!
Sets the list of directories that will be searched when named data
is requested to the those given in the string list \a path.
\sa filePath()
*/
void QMimeSourceFactory::setFilePath( const QStringList& path )
{
d->path = path;
}
/*!
Returns the currently set search paths.
*/
QStringList QMimeSourceFactory::filePath() const
{
return d->path;
}
/*!
Adds another search path, \a p to the existing search paths.
\sa setFilePath()
*/
void QMimeSourceFactory::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 QMimeSourceFactory::setExtensionType( const QString& ext, const char* mimetype )
{
d->extensions.replace(ext, 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 QMimeSourceFactory::makeAbsolute(const QString& abs_or_rel_name, const QString& context) const
{
if ( context.isNull() ||
!(context[0] == '/'
#ifdef Q_WS_WIN
|| ( context[0] && context[1] == ':')
#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* QMimeSourceFactory::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 QTextDrag(text)).
*/
void QMimeSourceFactory::setText( const QString& abs_name, const QString& text )
{
setData(abs_name, new QTextDrag(text));
}
/*!
Sets \a image to be the data item associated with the absolute
name \a abs_name.
Equivalent to setData(abs_name, new QImageDrag(image)).
*/
void QMimeSourceFactory::setImage( const QString& abs_name, const QImage& image )
{
setData(abs_name, new QImageDrag(image));
}
/*!
Sets \a pixmap to be the data item associated with the absolute
name \a abs_name.
*/
void QMimeSourceFactory::setPixmap( const QString& abs_name, const QPixmap& pixmap )
{
setData(abs_name, new QImageDrag(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 QMimeSourceFactory::setData( const QString& abs_name, QMimeSource* data )
{
if ( d->stored.contains(abs_name) )
delete d->stored[abs_name];
d->stored.replace(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()
*/
QMimeSourceFactory* QMimeSourceFactory::defaultFactory()
{
if (!defaultfactory)
{
defaultfactory = new QMimeSourceFactory();
qmime_cleanup_factory.set( &defaultfactory );
}
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 QMimeSourceFactory::setDefaultFactory( QMimeSourceFactory* 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.
*/
QMimeSourceFactory* QMimeSourceFactory::takeDefaultFactory()
{
QMimeSourceFactory *f = defaultfactory;
defaultfactory = 0;
return f;
}
/*!
Adds the QMimeSourceFactory \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 QMimeSourceFactory::addFactory( QMimeSourceFactory *f )
{
QMimeSourceFactory::defaultFactory()->d->factories.append( f );
}
/*!
Removes the mimesource factory \a f from the list of available
mimesource factories.
\sa addFactory();
*/
void QMimeSourceFactory::removeFactory( QMimeSourceFactory *f )
{
QMimeSourceFactory::defaultFactory()->d->factories.removeRef( f );
}
#endif // QT_NO_MIME