--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/designer/src/lib/extension/qextensionmanager.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,174 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@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