QWidgetFactory - For the dynamic creation of widgets from Qt Designer .ui files
virtual ~QWidgetFactory ()
virtual QWidget * createWidget ( const QString & className, QWidget * parent, const char *
name ) const
Static Public Members
QWidget * create ( const QString & uiFile, QObject * connector = 0, QWidget * parent = 0,
const char * name = 0 )
QWidget * create ( QIODevice * dev, QObject * connector = 0, QWidget * parent = 0, const
char * name = 0 )
void addWidgetFactory ( QWidgetFactory * factory )
void loadImages ( const QString & dir )
QStringList widgets ()
bool supportsWidget ( const QString & widget )
The QWidgetFactory class provides for the dynamic creation of widgets from Qt Designer .ui
This class basically offers two things:
Dynamically creating widgets from Qt Designer user interface description files. You can do
this using the static function QWidgetFactory::create(). 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
QObject::child() and QObject::queryList() to access child widgets of this returned widget.
Adding additional widget factories to be able to create custom widgets. See createWidget()
This class is not included in the Qt library itself. To use it you must link against
libqui.so (Unix) or qui.lib (Windows), which is built into INSTALL/lib if you built Qt
Designer (INSTALL is the directory where Qt is installed ).
If you create a QMainWindow using a QWidgetFactory, be aware that it already has a central
widget. Therefore, you need to delete this one before setting another one.
See the "Creating Dynamic Dialogs from .ui Files" section of the Qt Designer manual for an
example. See also the QWidgetPlugin class and the Plugins documentation.
MEMBER FUNCTION DOCUMENTATION
Constructs a QWidgetFactory.
QWidgetFactory::~QWidgetFactory () [virtual]
void QWidgetFactory::addWidgetFactory ( QWidgetFactory * factory ) [static]
Installs a widget factory factory, which normally contains additional widgets that can
then be created using a QWidgetFactory. See createWidget() for further details.
QWidget * QWidgetFactory::create ( const QString & uiFile, QObject * connector = 0, QWidget *
parent = 0, const char * name = 0 ) [static]
Loads the Qt Designer user interface description file uiFile and returns the top-level
widget in that description. parent and name are passed to the constructor of the top-level
This function also performs signal and slot connections, tab ordering, etc., as described
in the .ui file. In Qt Designer 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
QObject, which implements all these slots. Then pass an instance of the object as
connector to this function. If you do this, the connections to the custom slots will be
done using the connector as slot.
If something fails, 0 is returned.
The ownership of the returned widget is passed to the caller.
QWidget * QWidgetFactory::create ( QIODevice * dev, QObject * connector = 0, QWidget * parent =
0, const char * name = 0 ) [static]
This is an overloaded member function, provided for convenience. It behaves essentially
like the above function.
Loads the user interface description from device dev.
QWidget * QWidgetFactory::createWidget ( const QString & className, QWidget * parent, const char
* name ) const [virtual]
Creates a widget of the type className passing parent and name to its constructor.
If className 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 addWidgetFactory()). If the
widget cannot be created by any of these means, 0 is returned.
If you have a custom widget, and want it to be created using the widget factory, there are
two approaches you can use:
Write a widget plugin. This allows you to use the widget in Qt Designer and in this
QWidgetFactory. See the widget plugin documentation for further details. (See the
"Creating Custom Widgets with Plugins" section of the Qt Designer manual for an example.
Subclass QWidgetFactory. Then reimplement this function to create and return an instance
of your custom widget if className 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:
QWidgetFactory::addWidgetFactory( new MyWidgetFactory );
where MyWidgetFactory is your QWidgetFactory subclass.
void QWidgetFactory::loadImages ( const QString & dir ) [static]
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 QMimeSourceFactory for the pixmaps. Either add it there manually, or
call this function and specify the directory where the images can be found, as dir. This
is normally the directory called images in the project's directory.
bool QWidgetFactory::supportsWidget ( const QString & widget ) [static]
Returns TRUE if the widget factory can create the specified widget; otherwise returns
QStringList QWidgetFactory::widgets () [static]
Returns the names of the widgets this factory can create.
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Trolltech AS 2 February 2007 QWidgetFactory(3qt)