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169 lines
10 KiB
169 lines
10 KiB
14 years ago
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/tools/designer/uilib/qwidgetfactory.cpp:207 -->
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<title>QWidgetFactory Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Functions</font></a>
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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>QWidgetFactory Class Reference</h1>
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<p>The QWidgetFactory class provides for the dynamic creation of widgets
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from Qt Designer .ui files.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qwidgetfactory-h.html">qwidgetfactory.h</a>></tt>
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<p><a href="qwidgetfactory-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="#QWidgetFactory"><b>QWidgetFactory</b></a> ()</li>
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<li class=fn>virtual <a href="#~QWidgetFactory"><b>~QWidgetFactory</b></a> ()</li>
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<li class=fn>virtual QWidget * <a href="#createWidget"><b>createWidget</b></a> ( const QString & className, QWidget * parent, const char * name ) const</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>QWidget * <a href="#create"><b>create</b></a> ( const QString & uiFile, QObject * connector = 0, QWidget * parent = 0, const char * name = 0 )</li>
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<li class=fn>QWidget * <a href="#create-2"><b>create</b></a> ( QIODevice * dev, QObject * connector = 0, QWidget * parent = 0, const char * name = 0 )</li>
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<li class=fn>void <a href="#addWidgetFactory"><b>addWidgetFactory</b></a> ( QWidgetFactory * factory )</li>
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<li class=fn>void <a href="#loadImages"><b>loadImages</b></a> ( const QString & dir )</li>
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<li class=fn>QStringList <a href="#widgets"><b>widgets</b></a> ()</li>
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<li class=fn>bool <a href="#supportsWidget"><b>supportsWidget</b></a> ( const QString & widget )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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<p> The QWidgetFactory class provides for the dynamic creation of widgets
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from Qt Designer .ui files.
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<p> This class basically offers two things:
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<p> <ul>
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<p> <li> Dynamically creating widgets from <a href="designer-manual.html">Qt
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Designer</a> user interface description files.
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You can do this using the static function <a href="#create">QWidgetFactory::create</a>().
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This function also performs signal and slot connections, tab
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ordering, etc., as defined in the .ui file, and returns the
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top-level widget in the .ui file. After creating the widget you can
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use <a href="qobject.html#child">QObject::child</a>() and <a href="qobject.html#queryList">QObject::queryList</a>() to access child
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widgets of this returned widget.
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<p> <li> Adding additional widget factories to be able to create custom
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widgets. See <a href="#createWidget">createWidget</a>() for details.
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<p> </ul>
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<p> This class is not included in the Qt library itself. To use it you
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must link against <tt>libqui.so</tt> (Unix) or <tt>qui.lib</tt> (Windows), which is
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built into <tt>INSTALL/lib</tt> if you built <em>Qt Designer</em> (<tt>INSTALL</tt> is
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the directory where Qt is installed ).
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<p> If you create a <a href="qmainwindow.html">QMainWindow</a> using a QWidgetFactory, be aware that
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it already has a central widget. Therefore, you need to delete this
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one before setting another one.
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<p> See the "Creating Dynamic Dialogs from .ui Files" section of the <a href="designer-manual.html">Qt Designer manual</a> for an example. See
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also the <a href="qwidgetplugin.html">QWidgetPlugin</a> class and the <a href="plugins-howto.html">Plugins documentation</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="QWidgetFactory"></a>QWidgetFactory::QWidgetFactory ()
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</h3> Constructs a QWidgetFactory.
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<h3 class=fn><a name="~QWidgetFactory"></a>QWidgetFactory::~QWidgetFactory ()<tt> [virtual]</tt>
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</h3>
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Destructor.
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<h3 class=fn>void <a name="addWidgetFactory"></a>QWidgetFactory::addWidgetFactory ( <a href="qwidgetfactory.html">QWidgetFactory</a> * factory )<tt> [static]</tt>
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</h3> Installs a widget factory <em>factory</em>, which normally contains
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additional widgets that can then be created using a QWidgetFactory.
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See <a href="#createWidget">createWidget</a>() for further details.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="create"></a>QWidgetFactory::create ( const <a href="qstring.html">QString</a> & uiFile, <a href="qobject.html">QObject</a> * connector = 0, <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 )<tt> [static]</tt>
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</h3>
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<p> Loads the <em>Qt Designer</em> user interface description file <em>uiFile</em>
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and returns the top-level widget in that description. <em>parent</em> and
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<em>name</em> are passed to the constructor of the top-level widget.
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<p> This function also performs signal and slot connections, tab
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ordering, etc., as described in the .ui file. In <em>Qt Designer</em> it
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is possible to add custom slots to a form and connect to them. If
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you want these connections to be made, you must create a class
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derived from <a href="qobject.html">QObject</a>, which implements all these slots. Then pass an
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instance of the object as <em>connector</em> to this function. If you do
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this, the connections to the custom slots will be done using the <em>connector</em> as slot.
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<p> If something fails, 0 is returned.
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<p> The ownership of the returned widget is passed to the caller.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="create-2"></a>QWidgetFactory::create ( <a href="qiodevice.html">QIODevice</a> * dev, <a href="qobject.html">QObject</a> * connector = 0, <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0 )<tt> [static]</tt>
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</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Loads the user interface description from device <em>dev</em>.
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<h3 class=fn><a href="qwidget.html">QWidget</a> * <a name="createWidget"></a>QWidgetFactory::createWidget ( const <a href="qstring.html">QString</a> & className, <a href="qwidget.html">QWidget</a> * parent, const char * name ) const<tt> [virtual]</tt>
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</h3>
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Creates a widget of the type <em>className</em> passing <em>parent</em> and <em>name</em> to its constructor.
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<p> If <em>className</em> is a widget in the Qt library, it is directly
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created by this function. If the widget isn't in the Qt library,
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each of the installed widget plugins is asked, in turn, to create
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the widget. As soon as a plugin says it can create the widget it
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is asked to do so. It may occur that none of the plugins can
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create the widget, in which case each installed widget factory is
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asked to create the widget (see <a href="#addWidgetFactory">addWidgetFactory</a>()). If the widget
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cannot be created by any of these means, 0 is returned.
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<p> If you have a custom widget, and want it to be created using the
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widget factory, there are two approaches you can use:
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<p> <ol type=1>
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<p> <li> Write a widget plugin. This allows you to use the widget in
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<em>Qt Designer</em> and in this QWidgetFactory. See the widget plugin
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documentation for further details. (See the "Creating Custom
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Widgets with Plugins" section of the <a href="designer-manual.html">Qt
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Designer manual</a> for an example.
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<p> <li> Subclass QWidgetFactory. Then reimplement this function to
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create and return an instance of your custom widget if <em>className</em> equals the name of your widget, otherwise return 0. Then
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at the beginning of your program where you want to use the widget
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factory to create widgets do a:
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<pre>
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QWidgetFactory::<a href="#addWidgetFactory">addWidgetFactory</a>( new MyWidgetFactory );
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</pre>
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where MyWidgetFactory is your QWidgetFactory subclass.
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<p> </ol>
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<h3 class=fn>void <a name="loadImages"></a>QWidgetFactory::loadImages ( const <a href="qstring.html">QString</a> & dir )<tt> [static]</tt>
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</h3>
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If you use a pixmap collection (which is the default for new
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projects) rather than saving the pixmaps within the .ui XML file,
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you must load the pixmap collection. QWidgetFactory looks in the
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default <a href="qmimesourcefactory.html">QMimeSourceFactory</a> for the pixmaps. Either add it there
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manually, or call this function and specify the directory where
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the images can be found, as <em>dir</em>. This is normally the
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directory called <tt>images</tt> in the project's directory.
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<h3 class=fn>bool <a name="supportsWidget"></a>QWidgetFactory::supportsWidget ( const <a href="qstring.html">QString</a> & widget )<tt> [static]</tt>
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</h3> Returns TRUE if the widget factory can create the specified <em>widget</em>;
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otherwise returns FALSE.
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<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="widgets"></a>QWidgetFactory::widgets ()<tt> [static]</tt>
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</h3> Returns the names of the widgets this factory can create.
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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">Qt 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>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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