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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>
<p>The QWidgetFactory class provides for the dynamic creation of widgets
from Qt Designer .ui files.
<a href="#details">More...</a>
<p><tt>#include <<a href="qwidgetfactory-h.html">qwidgetfactory.h</a>></tt>
<p><a href="qwidgetfactory-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class=fn><a href="#QWidgetFactory"><b>QWidgetFactory</b></a> ()</div></li>
<li><div class=fn>virtual <a href="#~QWidgetFactory"><b>~QWidgetFactory</b></a> ()</div></li>
<li><div class=fn>virtual QWidget * <a href="#createWidget"><b>createWidget</b></a> ( const QString & className, QWidget * parent, const char * name ) const</div></li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li><div class=fn>QWidget * <a href="#create"><b>create</b></a> ( const QString & uiFile, QObject * connector = 0, QWidget * parent = 0, const char * name = 0 )</div></li>
<li><div class=fn>QWidget * <a href="#create-2"><b>create</b></a> ( QIODevice * dev, QObject * connector = 0, QWidget * parent = 0, const char * name = 0 )</div></li>
<li><div class=fn>void <a href="#addWidgetFactory"><b>addWidgetFactory</b></a> ( QWidgetFactory * factory )</div></li>
<li><div class=fn>void <a href="#loadImages"><b>loadImages</b></a> ( const QString & dir )</div></li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
<p> The QWidgetFactory class provides for the dynamic creation of widgets
from Qt Designer .ui files.
<p> This class basically offers two things:
<p> <ul>
<p> <li> Dynamically creating widgets from <em>Qt Designer</em> user interface
description files. You can do this using the static function
<a href="#create">QWidgetFactory::create</a>(). This function also performs signal and
slot connections, tab ordering, etc., as defined in the .ui file, and
returns the top-level widget in the .ui file. After creating the
widget you can use <a href="qobject.html#child">QObject::child</a>() and <a href="qobject.html#queryList">QObject::queryList</a>() to
access child widgets of this returned widget.
<p> <li> Adding additional widget factories to be able to create custom
widgets. See <a href="#createWidget">createWidget</a>() for details.
<p> </ul>
<p> This class is not included in the Qt library itself. To use it you
must link against <tt>libqui.so</tt> (Unix) or <tt>qui.lib</tt> (Windows), which is
built into <tt>$(QTDIR)/lib</tt> if you built <em>Qt Designer</em>.
<p> See the Creating Dynamic Dialogs from .ui Files section of the <a href="designer-manual.html">Qt Designer manual</a> for an example.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QWidgetFactory"></a>QWidgetFactory::QWidgetFactory ()
</h3> Constructs a QWidgetFactory.
<h3 class=fn><a name="~QWidgetFactory"></a>QWidgetFactory::~QWidgetFactory ()<tt> [virtual]</tt>
</h3>
Destructor.
<h3 class=fn>void <a name="addWidgetFactory"></a>QWidgetFactory::addWidgetFactory ( <a href="qwidgetfactory.html">QWidgetFactory</a> * factory )<tt> [static]</tt>
</h3> Installs a widget factory <em>factory</em>, which normally contains
additional widgets that can then be created using a QWidgetFactory.
See <a href="#createWidget">createWidget</a>() for further details.
<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>
</h3>
<p> Loads the <em>Qt Designer</em> user interface description file <em>uiFile</em>
and returns the top-level widget in that description. <em>parent</em> and
<em>name</em> are passed to the constructor of the top-level widget.
<p> This function also performs signal and slot connections, tab
ordering, etc., as described in the .ui file. In <em>Qt Designer</em> it
is possible to add custom slots to a form and connect to them. If
you want these connections to be made, you must create a class
derived from <a href="qobject.html">QObject</a>, which implements all these slots. Then pass an
instance of the object as <em>connector</em> to this function. If you do
this, the connections to the custom slots will be done using the <em>connector</em> as slot.
<p> If something fails, 0 is returned.
<p> The ownership of the returned widget is passed to the caller.
<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>
</h3> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Loads the user interface description from device <em>dev</em>.
<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>
</h3> Creates a widget of the type <tt>className</tt> passing <em>parent</em> and
<em>name</em> to its constructor.
<p> If <em>className</em> is a widget in the Qt library, it is directly
created by this function. If the widget isn't in the Qt library,
each of the installed widget plugins is asked, in turn, to create
the widget. As soon as a plugin says it can create the widget it is
asked to do so. It may occur that none of the plugins can create the
widget, in which case each installed widget factory is asked to
create the widget (see <a href="#addWidgetFactory">addWidgetFactory</a>()). If the widget cannot be
created by any of these means, 0 is returned.
<p> If you have a custom widget, and want it to be created using the
widget factory, there are two approaches you can use:
<p> <ol type=1>
<p> <li> Write a widget plugin. This allows you to use the
widget in <em>Qt Designer</em> and in this QWidgetFactory. See the widget
plugin documentation for further details. (See the <a href="designer-manual-6.html6.book#creatingplugins">Creating Custom Widgets with
Plugins</a> section of the <a href="designer-manual.html">Qt
Designer manual</a> for an example.
<p> <li> Subclass QWidgetFactory. Then reimplement this function to create
and return an instance of your custom widget if <em>className</em> equals
the name of your widget, otherwise return 0. Then at the beginning
of your program where you want to use the widget factory to create
widgets do a:
<pre>
QWidgetFactory::<a href="#addWidgetFactory">addWidgetFactory</a>( new MyWidgetFactory );
</pre>
where MyWidgetFactory is your QWidgetFactory subclass.
<p> </ol>
<p>
<h3 class=fn>void <a name="loadImages"></a>QWidgetFactory::loadImages ( const <a href="qstring.html">QString</a> & dir )<tt> [static]</tt>
</h3>
If you use a pixmap collection (which is the default for new
projects) rather than saving the pixmaps
within the .ui XML file, you must load the
pixmap collection. QWidgetFactory looks in the default
<a href="qmimesourcefactory.html">QMimeSourceFactory</a> for the pixmaps. Either add it there
manually, or call this function and specify the directory where
the images can be found, as <em>dir</em>. This is normally the directory
called <tt>images</tt> in the project's directory.
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