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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+ \class QDesignerContainerExtension
+ \brief The QDesignerContainerExtension class allows you to add pages to
+ a custom multi-page container in Qt Designer's workspace.
+ \inmodule QtDesigner
+
+ QDesignerContainerExtension provide an interface for creating
+ custom container extensions. A container extension consists of a
+ collection of functions that \QD needs to manage a multi-page
+ container plugin, and a list of the container's pages.
+
+ \image containerextension-example.png
+
+ \warning This is \e not an extension for container plugins in
+ general, only custom \e multi-page containers.
+
+ To create a container extension, your extension class must inherit
+ from both QObject and QDesignerContainerExtension. For example:
+
+ \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 6
+
+ Since we are implementing an interface, we must ensure that it's
+ made known to the meta object system using the Q_INTERFACES()
+ macro. This enables \QD to use the qobject_cast() function to
+ query for supported interfaces using nothing but a QObject
+ pointer.
+
+ You must reimplement several functions to enable \QD to manage a
+ custom multi-page container widget: \QD uses count() to keep track
+ of the number pages in your container, widget() to return the page
+ at a given index in the list of the container's pages, and
+ currentIndex() to return the list index of the selected page. \QD
+ uses the addWidget() function to add a given page to the
+ container, expecting it to be appended to the list of pages, while
+ it expects the insertWidget() function to add a given page to the
+ container by inserting it at a given index.
+
+ In \QD the extensions are not created until they are
+ required. For that reason you must also create a
+ QExtensionFactory, i.e a class that is able to make an instance of
+ your extension, and register it using \QD's \l
+ {QExtensionManager}{extension manager}.
+
+ When a container extension is required, \QD's \l
+ {QExtensionManager}{extension manager} will run through all its
+ registered factories calling QExtensionFactory::createExtension()
+ for each until the first one that is able to create a container
+ extension, is found. This factory will then create the extension
+ for the plugin.
+
+ There are four available types of extensions in \QD:
+ QDesignerContainerExtension , QDesignerMemberSheetExtension,
+ QDesignerPropertySheetExtension and QDesignerTaskMenuExtension.
+ \QD's behavior is the same whether the requested extension is
+ associated with a multi page container, a member sheet, a property
+ sheet or a task menu.
+
+ The QExtensionFactory class provides a standard extension factory,
+ and can also be used as an interface for custom extension
+ factories. You can either create a new QExtensionFactory and
+ reimplement the QExtensionFactory::createExtension() function. For
+ example:
+
+ \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 7
+
+ Or you can use an existing factory, expanding the
+ QExtensionFactory::createExtension() function to make the factory
+ able to create a container extension as well. For example:
+
+ \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 8
+
+ For a complete example using the QDesignerContainerExtension
+ class, see the \l {designer/containerextension}{Container
+ Extension example}. The example shows how to create a custom
+ multi-page plugin for \QD.
+
+ \sa QExtensionFactory, QExtensionManager, {Creating Custom Widget
+ Extensions}
+*/
+
+/*!
+ \fn QDesignerContainerExtension::~QDesignerContainerExtension()
+
+ Destroys the extension.
+*/
+
+/*!
+ \fn int QDesignerContainerExtension::count() const
+
+ Returns the number of pages in the container.
+*/
+
+/*!
+ \fn QWidget *QDesignerContainerExtension::widget(int index) const
+
+ Returns the page at the given \a index in the extension's list of
+ pages.
+
+ \sa addWidget(), insertWidget()
+*/
+
+/*!
+ \fn int QDesignerContainerExtension::currentIndex() const
+
+ Returns the index of the currently selected page in the
+ container.
+
+ \sa setCurrentIndex()
+*/
+
+/*!
+ \fn void QDesignerContainerExtension::setCurrentIndex(int index)
+
+ Sets the currently selected page in the container to be the
+ page at the given \a index in the extension's list of pages.
+
+ \sa currentIndex()
+*/
+
+/*!
+ \fn void QDesignerContainerExtension::addWidget(QWidget *page)
+
+ Adds the given \a page to the container by appending it to the
+ extension's list of pages.
+
+ \sa insertWidget(), remove(), widget()
+*/
+
+/*!
+ \fn void QDesignerContainerExtension::insertWidget(int index, QWidget *page)
+
+ Adds the given \a page to the container by inserting it at the
+ given \a index in the extension's list of pages.
+
+ \sa addWidget(), remove(), widget()
+*/
+
+/*!
+ \fn void QDesignerContainerExtension::remove(int index)
+
+ Removes the page at the given \a index from the extension's list
+ of pages.
+
+ \sa addWidget(), insertWidget()
+*/