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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of this
** file.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qaxserver-demo-hierarchy.html
\title Qt Widget Hierarchy
\input examples/activeqt/hierarchy-demo.qdocinc
*/
/*!
\example activeqt/hierarchy
\title Hierarchy Example (ActiveQt)
The Hierarchy example is shows how to write an in-process ActiveX
control. The control is a QWidget subclass with child widgets
that are accessible as sub-types.
\snippet examples/activeqt/hierarchy/objects.h 0
The \c QParentWidget class provides slots to create a widget
with a name, and to return a pointer to a named widget. The class
declaration uses \c Q_CLASSINFO() to provide the COM identifiers for
this class.
\snippet examples/activeqt/hierarchy/objects.cpp 0
The constructor of QParentWidget creates a vertical box layout.
New child widgets are automatically added to the layout.
\snippet examples/activeqt/hierarchy/objects.cpp 1
The \c createSubWidget slot creates a new \c QSubWidget with
the name provided in the parameter, and sets the label to that
name. The widget is also shown explicitly.
\snippet examples/activeqt/hierarchy/objects.cpp 2
The \c subWidget slot uses the \c QObject::child() function and
returns the first child of type \c QSubWidget that has the requested
name.
\snippet examples/activeqt/hierarchy/objects.h 1
The \c QSubWidget class has a single string-property \c label,
and implements the paintEvent to draw the label. The class uses
again \c Q_CLASSINFO to provide the COM identifiers, and also sets
the \e ToSuperClass attribute to \e QSubWidget, to ensure that only
no slots of any superclasses (i.e. QWidget) are exposed.
\snippet examples/activeqt/hierarchy/objects.cpp 3
\snippet examples/activeqt/hierarchy/objects.cpp 4
The implementation of the QSubWidget class is self-explanatory.
\snippet examples/activeqt/hierarchy/main.cpp 0
The classes are then exported using a QAxFactory. \c QParentWidget is
exported as a full class (which can be created ), while \c QSubWidget is
only exported as a type, which can only be created indirectly through
APIs of \c QParentWidget.
To build the example you must first build the QAxServer library.
Then run qmake and your make tool in \c examples/activeqt/hierarchy.
The \l{qaxserver-demo-hierarchy.html}{demonstration} requires
your WebBrowser to support ActiveX controls, and scripting to be
enabled.
\snippet examples/activeqt/hierarchy-demo.qdocinc 0
*/
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