QMimeSourceFactory(3qt)QMimeSourceFactory(3qt)NAMEQMimeSourceFactory - An extensible supply of MIME-typed
data
#include <qmime.h>
Public Members
QMimeSourceFactory ()
virtual ~QMimeSourceFactory ()
virtual const QMimeSource* data ( const QString & abs_name
) const
virtual QString makeAbsolute ( const QString &
abs_or_rel_name, const QString & context ) const
const QMimeSource* data ( const QString & abs_or_rel_name,
const QString & context ) const
virtual void setText ( const QString & abs_name, const
QString & text )
virtual void setImage ( const QString & abs_name, const
QImage & im )
virtual void setPixmap ( const QString & abs_name, const
QPixmap & pm )
virtual void setData ( const QString & abs_name,
QMimeSource * data )
virtual void setFilePath ( const QStringList & )
virtual QStringList filePath () const
void addFilePath ( const QString & )
virtual void setExtensionType ( const QString & ext, const
char * mimetype )
Static Public Members
QMimeSourceFactory* defaultFactory ()
void setDefaultFactory ( QMimeSourceFactory * )
DESCRIPTION
An extensible supply of MIME-typed data.
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 like
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 setText(),
setImage(), and setPixmap() that simply call setData()
with massaged parameters).
The rich text widgets QTextView and QTextBrowser use
QMimeSourceFactory to resolve references such as images or
links within rich text documents. They either access the
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QMimeSourceFactory(3qt)QMimeSourceFactory(3qt)
default factory ( see defaultFactory() ) or their own (
see QTextView::setMimeSourceFactory() ). Other classes
that are capable of displaying rich text like QLabel,
QWhatsThis or QMessageBox always use the default factory.
As mentioned earlier, a factory can also be used as
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
static const char* myimage_xpm[]={
"...",
...
"..."};
To be able to use this image within some rich text, for
example inside a QLabel, you have to create a QImage from
the raw data and insert it into the factory with a unique
name:
QMimeSourceFactory::defaultFactory()->setImage( "myimage", QImage(myimage_data) );
Now you can create a rich text QLabel with
QLabel* label = new QLabel(
"Rich text with embedded image:<img source=\"myimage\">"
"Isn't that <em>cute</em>?" );
MEMBER FUNCTION DOCUMENTATIONQMimeSourceFactory::QMimeSourceFactory ()
Constructs a QMimeSourceFactory which has no file path and
no stored content.
QMimeSourceFactory::~QMimeSourceFactory () [virtual]
Destructs the QMimeSourceFactory, deleting all stored
content.
void QMimeSourceFactory::addFilePath ( const QString & p )
Adds another search path.
See also setFilePath().
const QMimeSource* QMimeSourceFactory::data ( const QString &
abs_name ) const [virtual]
Returns a reference to the data associated with abs_name.
The return value only remains valid until a subsequent
call to this function for the same object, and only if
setData() is not called to modify the data, so you should
immediately decode the result.
If there is no data associated with abs_name in the
factory's store, the factory tries to access the local
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QMimeSourceFactory(3qt)QMimeSourceFactory(3qt)
filesystem. If abs_name isn't an absolute filename, the
factory will search for it on all defined paths ( see
setFilePath() ).
The factory understands all image formats supported by
QImageIO. Any other mime types are determined by the
filename extension. The default settings are
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");
The effect of these is that filenames ending in "html" or
"htm" will be treated as text encoded in the iso8859-1
encoding, those ending in "txt" will be treated as text
encoded in the local encoding; those ending in "xml" will
be treated as text encoded in UTF8 encoding. 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 as such
files can be viewed regardless of the run-time 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, which is just 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 you problem domain, you
may inherit QMimeSourceFactory and reimplement this
function to perform some more clever mime type detection.
The same applies if you want to use the mime source
factory for accessing URL referenced data over a network.
const QMimeSource* QMimeSourceFactory::data ( const QString &
abs_or_rel_name, const QString & context ) const
A convenience function. See data(const QString& abs_name).
QMimeSourceFactory* QMimeSourceFactory::defaultFactory ()
[static]
Returns the application-wide default mime source factory.
This factory is used by rich text rendering classes such
as QSimpleRichText, QWhatsThis and also QMessageBox to
resolve named references within rich text documents. It
serves also as initial factory for the more complex render
widgets QTextView and QTextBrowser.
See also setDefaultFactory().
QStringList QMimeSourceFactory::filePath () const [virtual]
Returns the currently set search paths.
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QMimeSourceFactory(3qt)QMimeSourceFactory(3qt)QString QMimeSourceFactory::makeAbsolute ( const QString &
abs_or_rel_name, const QString & context ) const [virtual]
Converts the absolute or relative data item name
abs_or_rel_name to an absolute name, interpreted within
the context of the data item named context (this must be
an absolute name).
void QMimeSourceFactory::setData ( const QString & abs_name,
QMimeSource * data ) [virtual]
Sets data to be the data item associated with the absolute
name abs_name. Note that the ownership of data is
transferred to the factory - do not delete or access the
pointer after passing it to this function.
void QMimeSourceFactory::setDefaultFactory ( QMimeSourceFactory *
factory ) [static]
Sets the default factory, destroying any previously set
mime source provider. The ownership of the factory is
transferred.
See also defaultFactory().
void QMimeSourceFactory::setExtensionType ( const QString & ext,
const char * mimetype ) [virtual]
Sets the MIME-type to be associated with a filename
extension. This determines the MIME-type for files found
via a path set by setFilePath().
void QMimeSourceFactory::setFilePath ( const QStringList & path )
[virtual]
Sets a list of directories which will be searched when
named data is requested.
See also filePath().
void QMimeSourceFactory::setImage ( const QString & abs_name,
const QImage & image ) [virtual]
Sets image to be the data item associated with the
absolute name abs_name.
Equivalent to setData(abs_name, new QImageDrag(image)).
void QMimeSourceFactory::setPixmap ( const QString & abs_name,
const QPixmap & pixmap ) [virtual]
Sets pixmap to be the data item associated with the
absolute name abs_name.
void QMimeSourceFactory::setText ( const QString & abs_name,
const QString & text ) [virtual]
Sets text to be the data item associated with the absolute
name abs_name.
Equivalent to setData(abs_name, new QTextDrag(text)).
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QMimeSourceFactory(3qt)QMimeSourceFactory(3qt)SEE ALSO
http://doc.trolltech.com/qmimesourcefactory.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
http://www.trolltech.com. See the license file included
in the distribution for a complete license statement.
AUTHOR
Generated automatically from the source code.
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Please include the name of the manual page
(qmimesourcefactory.3qt) and the Qt version (2.3.1).
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