Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Qt Designer 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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qextensionmanager.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QExtensionManager
+
+    \brief The QExtensionManager class provides extension management
+    facilities for Qt Designer.
+
+    \inmodule QtDesigner
+
+    In \QD the extensions are not created until they are required. For
+    that reason, when implementing an extension, 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 extension manager.
+
+    The registration of an extension factory is typically made in the
+    QDesignerCustomWidgetInterface::initialize() function:
+
+    \snippet doc/src/snippets/code/tools_designer_src_lib_extension_qextensionmanager.cpp 0
+
+    The QExtensionManager is not intended to be instantiated
+    directly. You can retrieve an interface to \QD's extension manager
+    using the QDesignerFormEditorInterface::extensionManager()
+    function. A pointer to \QD's current QDesignerFormEditorInterface
+    object (\c formEditor in the example above) is provided by the
+    QDesignerCustomWidgetInterface::initialize() function's
+    parameter. When implementing a custom widget plugin, you must
+    subclass the QDesignerCustomWidgetInterface to expose your plugin
+    to \QD.
+
+    Then, when an extension is required, \QD's extension manager will
+    run through all its registered factories calling
+    QExtensionFactory::createExtension() for each until the first one
+    that is able to create the requested extension for the selected
+    object, is found. This factory will then make an instance of the
+    extension.
+
+    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 container, a member
+    sheet, a property sheet or a task menu.
+
+    For a complete example using the QExtensionManager class, see the
+    \l {designer/taskmenuextension}{Task Menu Extension example}. The
+    example shows how to create a custom widget plugin for Qt
+    Designer, and how to to use the QDesignerTaskMenuExtension class
+    to add custom items to \QD's task menu.
+
+    \sa QExtensionFactory, QAbstractExtensionManager
+*/
+
+/*!
+    Constructs an extension manager with the given \a parent.
+*/
+QExtensionManager::QExtensionManager(QObject *parent)
+    : QObject(parent)
+{
+}
+
+
+/*!
+  Destroys the extension manager
+*/
+QExtensionManager::~QExtensionManager()
+{
+}
+
+/*!
+    Register the extension specified by the given \a factory and
+    extension identifier \a iid.
+*/
+void QExtensionManager::registerExtensions(QAbstractExtensionFactory *factory, const QString &iid)
+{
+    if (iid.isEmpty()) {
+        m_globalExtension.prepend(factory);
+        return;
+    }
+
+    FactoryMap::iterator it = m_extensions.find(iid);
+    if (it == m_extensions.end())
+        it = m_extensions.insert(iid, FactoryList());
+
+    it.value().prepend(factory);
+}
+
+/*!
+    Unregister the extension specified by the given \a factory and
+    extension identifier \a iid.
+*/
+void QExtensionManager::unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid)
+{
+    if (iid.isEmpty()) {
+        m_globalExtension.removeAll(factory);
+        return;
+    }
+
+    const FactoryMap::iterator it = m_extensions.find(iid);
+    if (it == m_extensions.end())
+        return;
+
+    FactoryList &factories = it.value();
+    factories.removeAll(factory);
+
+    if (factories.isEmpty())
+        m_extensions.erase(it);
+}
+
+/*!
+    Returns the extension specified by \a iid, for the given \a
+    object.
+*/
+QObject *QExtensionManager::extension(QObject *object, const QString &iid) const
+{
+    const FactoryMap::const_iterator it = m_extensions.constFind(iid);
+    if (it != m_extensions.constEnd()) {
+        const FactoryList::const_iterator fcend = it.value().constEnd();
+        for (FactoryList::const_iterator fit = it.value().constBegin(); fit != fcend; ++fit)
+            if (QObject *ext = (*fit)->extension(object, iid))
+                return ext;
+    }
+    const FactoryList::const_iterator gfcend =  m_globalExtension.constEnd();
+    for (FactoryList::const_iterator git = m_globalExtension.constBegin(); git != gfcend; ++git)
+        if (QObject *ext = (*git)->extension(object, iid))
+            return ext;
+
+    return 0;
+}
+
+QT_END_NAMESPACE