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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** 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. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qaxserver-demo-hierarchy.html
\title Qt Widget Hierarchy
\input examples/hierarchy-demo.qdocinc
*/
/*!
\example activeqt/hierarchy
\title Hierarchy Example (ActiveQt)
\brief 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 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 activeqt/hierarchy/objects.cpp 0
The constructor of QParentWidget creates a vertical box layout.
New child widgets are automatically added to the layout.
\snippet 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 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 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 activeqt/hierarchy/objects.cpp 3
\snippet activeqt/hierarchy/objects.cpp 4
The implementation of the QSubWidget class is self-explanatory.
\snippet 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 activeqt/hierarchy.
The \l{qaxserver-demo-hierarchy.html}{demonstration} requires
your WebBrowser to support ActiveX controls, and scripting to be
enabled.
\snippet activeqt/hierarchy/doc/snippets/hierarchy-demo-snippet.qdoc script
*/
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