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278 lines
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278 lines
17 KiB
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qmime.cpp:179 -->
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<title>TQMimeSourceFactory Class</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQMimeSourceFactory Class Reference</h1>
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<p>The TQMimeSourceFactory class is an extensible provider of mime-typed data.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qmime-h.html">ntqmime.h</a>></tt>
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<p><a href="qmimesourcefactory-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQMimeSourceFactory"><b>TQMimeSourceFactory</b></a> ()</li>
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<li class=fn>virtual <a href="#~TQMimeSourceFactory"><b>~TQMimeSourceFactory</b></a> ()</li>
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<li class=fn>virtual const TQMimeSource * <a href="#data"><b>data</b></a> ( const TQString & abs_name ) const</li>
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<li class=fn>virtual TQString <a href="#makeAbsolute"><b>makeAbsolute</b></a> ( const TQString & abs_or_rel_name, const TQString & context ) const</li>
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<li class=fn>const TQMimeSource * <a href="#data-2"><b>data</b></a> ( const TQString & abs_or_rel_name, const TQString & context ) const</li>
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<li class=fn>virtual void <a href="#setText"><b>setText</b></a> ( const TQString & abs_name, const TQString & text )</li>
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<li class=fn>virtual void <a href="#setImage"><b>setImage</b></a> ( const TQString & abs_name, const TQImage & image )</li>
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<li class=fn>virtual void <a href="#setPixmap"><b>setPixmap</b></a> ( const TQString & abs_name, const TQPixmap & pixmap )</li>
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<li class=fn>virtual void <a href="#setData"><b>setData</b></a> ( const TQString & abs_name, TQMimeSource * data )</li>
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<li class=fn>virtual void <a href="#setFilePath"><b>setFilePath</b></a> ( const TQStringList & path )</li>
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<li class=fn>virtual TQStringList <a href="#filePath"><b>filePath</b></a> () const</li>
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<li class=fn>void <a href="#addFilePath"><b>addFilePath</b></a> ( const TQString & p )</li>
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<li class=fn>virtual void <a href="#setExtensionType"><b>setExtensionType</b></a> ( const TQString & ext, const char * mimetype )</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>TQMimeSourceFactory * <a href="#defaultFactory"><b>defaultFactory</b></a> ()</li>
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<li class=fn>void <a href="#setDefaultFactory"><b>setDefaultFactory</b></a> ( TQMimeSourceFactory * factory )</li>
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<li class=fn>TQMimeSourceFactory * <a href="#takeDefaultFactory"><b>takeDefaultFactory</b></a> ()</li>
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<li class=fn>void <a href="#addFactory"><b>addFactory</b></a> ( TQMimeSourceFactory * f )</li>
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<li class=fn>void <a href="#removeFactory"><b>removeFactory</b></a> ( TQMimeSourceFactory * f )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQMimeSourceFactory class is an extensible provider of mime-typed data.
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<p>
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<p> A TQMimeSourceFactory 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 <a href="qmimesource.html">TQMimeSource</a> object which can be examined and
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converted to concrete data types by functions such as
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<a href="qimagedrag.html#canDecode">TQImageDrag::canDecode</a>() and <a href="qimagedrag.html#decode">TQImageDrag::decode</a>().
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<p> The base TQMimeSourceFactory 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 <a href="#setFilePath">setFilePath</a>() before accessing
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data. For stored data, call <a href="#setData">setData</a>() for each item (there are
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also convenience functions, e.g. <a href="#setText">setText</a>(), <a href="#setImage">setImage</a>() and
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<a href="#setPixmap">setPixmap</a>(), that simply call setData() with appropriate
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parameters).
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<p> The rich text widgets, <a href="ntqtextedit.html">TQTextEdit</a> and <a href="ntqtextbrowser.html">TQTextBrowser</a>, use
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TQMimeSourceFactory 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 <a href="#defaultFactory">defaultFactory</a>()) or their own (see
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<a href="ntqtextedit.html#setMimeSourceFactory">TQTextEdit::setMimeSourceFactory</a>()). Other classes that are
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capable of displaying rich text (such as <a href="ntqlabel.html">TQLabel</a>, <a href="ntqwhatsthis.html">TQWhatsThis</a> or
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<a href="ntqmessagebox.html">TQMessageBox</a>) always use the default factory.
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<p> 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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<pre>
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static const char* myimage_data[]={
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"...",
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...
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"..."};
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</pre>
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<p> To be able to use this image within some rich text, for example
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inside a TQLabel, you must create a <a href="ntqimage.html">TQImage</a> from the raw data and
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insert it into the factory with a unique name:
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<pre>
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TQMimeSourceFactory::<a href="#defaultFactory">defaultFactory</a>()->setImage( "myimage", TQImage(myimage_data) );
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</pre>
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<p> Now you can create a rich text TQLabel with
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<p> <pre>
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<a href="ntqlabel.html">TQLabel</a>* label = new <a href="ntqlabel.html">TQLabel</a>(
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"Rich text with embedded image:<img source=\"myimage\">"
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"Isn't that <em>cute</em>?" );
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</pre>
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<p> When no longer needed, you can clear the data from the factory:
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<p> <pre>
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delete label;
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TQMimeSourceFactory::<a href="#defaultFactory">defaultFactory</a>()->setData( "myimage", 0 );
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</pre>
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<p>See also <a href="environment.html">Environment Classes</a> and <a href="io.html">Input/Output and Networking</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQMimeSourceFactory"></a>TQMimeSourceFactory::TQMimeSourceFactory ()
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</h3>
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Constructs a TQMimeSourceFactory that has no file path and no
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stored content.
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<h3 class=fn><a name="~TQMimeSourceFactory"></a>TQMimeSourceFactory::~TQMimeSourceFactory ()<tt> [virtual]</tt>
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</h3>
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Destroys the TQMimeSourceFactory, deleting all stored content.
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<h3 class=fn>void <a name="addFactory"></a>TQMimeSourceFactory::addFactory ( <a href="qmimesourcefactory.html">TQMimeSourceFactory</a> * f )<tt> [static]</tt>
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</h3>
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Adds the TQMimeSourceFactory <em>f</em> to the list of available
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mimesource factories. If the <a href="#defaultFactory">defaultFactory</a>() can't resolve a
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<a href="#data">data</a>() it iterates over the list of installed mimesource factories
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until the data can be resolved.
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<p> <p>See also <a href="#removeFactory">removeFactory</a>().
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<h3 class=fn>void <a name="addFilePath"></a>TQMimeSourceFactory::addFilePath ( const <a href="ntqstring.html">TQString</a> & p )
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</h3>
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Adds another search path, <em>p</em> to the existing search paths.
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<p> <p>See also <a href="#setFilePath">setFilePath</a>().
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<h3 class=fn>const <a href="qmimesource.html">TQMimeSource</a> * <a name="data"></a>TQMimeSourceFactory::data ( const <a href="ntqstring.html">TQString</a> & abs_name ) const<tt> [virtual]</tt>
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</h3>
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Returns a reference to the data associated with <em>abs_name</em>. The
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return value remains valid only until the next <a href="#data">data</a>() or <a href="#setData">setData</a>()
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call, so you should immediately decode the result.
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<p> If there is no data associated with <em>abs_name</em> in the factory's
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store, the factory tries to access the local filesystem. If <em>abs_name</em> isn't an absolute file name, the factory will search for
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it in all defined paths (see <a href="#setFilePath">setFilePath</a>()).
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<p> The factory understands all the image formats supported by
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<a href="qimageio.html">TQImageIO</a>. Any other mime types are determined by the file name
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extension. The default settings are
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<pre>
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<a href="#setExtensionType">setExtensionType</a>("html", "text/html;charset=iso8859-1");
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<a href="#setExtensionType">setExtensionType</a>("htm", "text/html;charset=iso8859-1");
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<a href="#setExtensionType">setExtensionType</a>("txt", "text/plain");
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<a href="#setExtensionType">setExtensionType</a>("xml", "text/xml;charset=UTF-8");
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</pre>
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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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<p> Any file data that is not recognized will be retrieved as a
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<a href="qmimesource.html">TQMimeSource</a> providing the "application/octet-stream" mime type,
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meaning uninterpreted binary data.
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<p> You can add further extensions or change existing ones with
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subsequent calls to <a href="#setExtensionType">setExtensionType</a>(). If the extension mechanism
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is not sufficient for your problem domain, you can inherit
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TQMimeSourceFactory 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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<h3 class=fn>const <a href="qmimesource.html">TQMimeSource</a> * <a name="data-2"></a>TQMimeSourceFactory::data ( const <a href="ntqstring.html">TQString</a> & abs_or_rel_name, const <a href="ntqstring.html">TQString</a> & context ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> A convenience function. See <a href="#data">data</a>(const <a href="ntqstring.html">TQString</a>& abs_name). The
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file name is given in <em>abs_or_rel_name</em> and the path is in <em>context</em>.
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<h3 class=fn><a href="qmimesourcefactory.html">TQMimeSourceFactory</a> * <a name="defaultFactory"></a>TQMimeSourceFactory::defaultFactory ()<tt> [static]</tt>
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</h3>
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Returns the application-wide default mime source factory. This
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factory is used by rich text rendering classes such as
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<a href="ntqsimplerichtext.html">TQSimpleRichText</a>, <a href="ntqwhatsthis.html">TQWhatsThis</a> and <a href="ntqmessagebox.html">TQMessageBox</a> to resolve named
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references within rich text documents. It serves also as the
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initial factory for the more complex render widgets, <a href="ntqtextedit.html">TQTextEdit</a> and
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<a href="ntqtextbrowser.html">TQTextBrowser</a>.
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<p> <p>See also <a href="#setDefaultFactory">setDefaultFactory</a>().
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<p>Examples: <a href="qaction-application-example.html#x1140">action/application.cpp</a> and <a href="simple-application-example.html#x1558">application/application.cpp</a>.
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<h3 class=fn><a href="ntqstringlist.html">TQStringList</a> <a name="filePath"></a>TQMimeSourceFactory::filePath () const<tt> [virtual]</tt>
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</h3>
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Returns the currently set search paths.
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<h3 class=fn><a href="ntqstring.html">TQString</a> <a name="makeAbsolute"></a>TQMimeSourceFactory::makeAbsolute ( const <a href="ntqstring.html">TQString</a> & abs_or_rel_name, const <a href="ntqstring.html">TQString</a> & context ) const<tt> [virtual]</tt>
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</h3>
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Converts the absolute or relative data item name <em>abs_or_rel_name</em> to an absolute name, interpreted within the
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context (path) of the data item named <em>context</em> (this must be an
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absolute name).
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<h3 class=fn>void <a name="removeFactory"></a>TQMimeSourceFactory::removeFactory ( <a href="qmimesourcefactory.html">TQMimeSourceFactory</a> * f )<tt> [static]</tt>
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</h3>
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Removes the mimesource factory <em>f</em> from the list of available
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mimesource factories.
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<p> <p>See also <a href="#addFactory">addFactory</a>().
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<h3 class=fn>void <a name="setData"></a>TQMimeSourceFactory::setData ( const <a href="ntqstring.html">TQString</a> & abs_name, <a href="qmimesource.html">TQMimeSource</a> * data )<tt> [virtual]</tt>
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</h3>
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Sets <em>data</em> to be the data item associated with
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the absolute name <em>abs_name</em>. Note that the ownership of <em>data</em> is
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transferred to the factory: do not delete or access the pointer after
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passing it to this function.
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<p> Passing 0 for data removes previously stored data.
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<h3 class=fn>void <a name="setDefaultFactory"></a>TQMimeSourceFactory::setDefaultFactory ( <a href="qmimesourcefactory.html">TQMimeSourceFactory</a> * factory )<tt> [static]</tt>
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</h3>
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Sets the default <em>factory</em>, destroying any previously set mime
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source provider. The ownership of the factory is transferred to
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TQt.
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<p> <p>See also <a href="#defaultFactory">defaultFactory</a>().
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<h3 class=fn>void <a name="setExtensionType"></a>TQMimeSourceFactory::setExtensionType ( const <a href="ntqstring.html">TQString</a> & ext, const char * mimetype )<tt> [virtual]</tt>
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</h3>
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Sets the mime-type to be associated with the file name extension,
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<em>ext</em> to <em>mimetype</em>. This determines the mime-type for files
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found via the paths set by <a href="#setFilePath">setFilePath</a>().
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<h3 class=fn>void <a name="setFilePath"></a>TQMimeSourceFactory::setFilePath ( const <a href="ntqstringlist.html">TQStringList</a> & path )<tt> [virtual]</tt>
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</h3>
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Sets the list of directories that will be searched when named data
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is requested to the those given in the string list <em>path</em>.
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<p> <p>See also <a href="#filePath">filePath</a>().
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<h3 class=fn>void <a name="setImage"></a>TQMimeSourceFactory::setImage ( const <a href="ntqstring.html">TQString</a> & abs_name, const <a href="ntqimage.html">TQImage</a> & image )<tt> [virtual]</tt>
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</h3>
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Sets <em>image</em> to be the data item associated with the absolute
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name <em>abs_name</em>.
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<p> Equivalent to <a href="#setData">setData</a>(abs_name, new <a href="qimagedrag.html">TQImageDrag</a>(image)).
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<h3 class=fn>void <a name="setPixmap"></a>TQMimeSourceFactory::setPixmap ( const <a href="ntqstring.html">TQString</a> & abs_name, const <a href="ntqpixmap.html">TQPixmap</a> & pixmap )<tt> [virtual]</tt>
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</h3>
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Sets <em>pixmap</em> to be the data item associated with the absolute
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name <em>abs_name</em>.
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<h3 class=fn>void <a name="setText"></a>TQMimeSourceFactory::setText ( const <a href="ntqstring.html">TQString</a> & abs_name, const <a href="ntqstring.html">TQString</a> & text )<tt> [virtual]</tt>
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</h3>
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Sets <em>text</em> to be the data item associated with the absolute name
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<em>abs_name</em>.
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<p> Equivalent to <a href="#setData">setData</a>(abs_name, new <a href="qtextdrag.html">TQTextDrag</a>(text)).
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<h3 class=fn><a href="qmimesourcefactory.html">TQMimeSourceFactory</a> * <a name="takeDefaultFactory"></a>TQMimeSourceFactory::takeDefaultFactory ()<tt> [static]</tt>
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</h3>
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Sets the <a href="#defaultFactory">defaultFactory</a>() to 0 and returns the previous one.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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