新增网络中转服务器+designer源码项目
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feiyangqingyun
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designer/lib/extension/qextensionmanager.cpp
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174
designer/lib/extension/qextensionmanager.cpp
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Designer of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qextensionmanager.h"
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QT_BEGIN_NAMESPACE
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/*!
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\class QExtensionManager
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\brief The QExtensionManager class provides extension management
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facilities for Qt Designer.
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\inmodule QtDesigner
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In \QD the extensions are not created until they are required. For
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that reason, when implementing an extension, you must also create
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a QExtensionFactory, i.e a class that is able to make an instance
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of your extension, and register it using \QD's extension manager.
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The registration of an extension factory is typically made in the
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QDesignerCustomWidgetInterface::initialize() function:
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\snippet doc/src/snippets/code/tools_designer_src_lib_extension_qextensionmanager.cpp 0
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The QExtensionManager is not intended to be instantiated
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directly. You can retrieve an interface to \QD's extension manager
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using the QDesignerFormEditorInterface::extensionManager()
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function. A pointer to \QD's current QDesignerFormEditorInterface
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object (\c formEditor in the example above) is provided by the
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QDesignerCustomWidgetInterface::initialize() function's
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parameter. When implementing a custom widget plugin, you must
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subclass the QDesignerCustomWidgetInterface to expose your plugin
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to \QD.
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Then, when an extension is required, \QD's extension manager will
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run through all its registered factories calling
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QExtensionFactory::createExtension() for each until the first one
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that is able to create the requested extension for the selected
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object, is found. This factory will then make an instance of the
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extension.
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There are four available types of extensions in \QD:
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QDesignerContainerExtension , QDesignerMemberSheetExtension,
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QDesignerPropertySheetExtension and
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QDesignerTaskMenuExtension. \QD's behavior is the same whether the
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requested extension is associated with a container, a member
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sheet, a property sheet or a task menu.
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For a complete example using the QExtensionManager class, see the
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\l {designer/taskmenuextension}{Task Menu Extension example}. The
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example shows how to create a custom widget plugin for Qt
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Designer, and how to to use the QDesignerTaskMenuExtension class
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to add custom items to \QD's task menu.
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\sa QExtensionFactory, QAbstractExtensionManager
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*/
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/*!
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Constructs an extension manager with the given \a parent.
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*/
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QExtensionManager::QExtensionManager(QObject *parent)
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: QObject(parent)
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{
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}
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/*!
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Destroys the extension manager
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*/
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QExtensionManager::~QExtensionManager()
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{
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}
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/*!
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Register the extension specified by the given \a factory and
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extension identifier \a iid.
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*/
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void QExtensionManager::registerExtensions(QAbstractExtensionFactory *factory, const QString &iid)
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{
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if (iid.isEmpty()) {
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m_globalExtension.prepend(factory);
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return;
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}
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FactoryMap::iterator it = m_extensions.find(iid);
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if (it == m_extensions.end())
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it = m_extensions.insert(iid, FactoryList());
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it.value().prepend(factory);
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}
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/*!
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Unregister the extension specified by the given \a factory and
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extension identifier \a iid.
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*/
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void QExtensionManager::unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid)
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{
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if (iid.isEmpty()) {
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m_globalExtension.removeAll(factory);
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return;
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}
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const FactoryMap::iterator it = m_extensions.find(iid);
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if (it == m_extensions.end())
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return;
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FactoryList &factories = it.value();
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factories.removeAll(factory);
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if (factories.isEmpty())
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m_extensions.erase(it);
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}
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/*!
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Returns the extension specified by \a iid, for the given \a
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object.
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*/
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QObject *QExtensionManager::extension(QObject *object, const QString &iid) const
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{
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const FactoryMap::const_iterator it = m_extensions.constFind(iid);
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if (it != m_extensions.constEnd()) {
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const FactoryList::const_iterator fcend = it.value().constEnd();
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for (FactoryList::const_iterator fit = it.value().constBegin(); fit != fcend; ++fit)
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if (QObject *ext = (*fit)->extension(object, iid))
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return ext;
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}
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const FactoryList::const_iterator gfcend = m_globalExtension.constEnd();
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for (FactoryList::const_iterator git = m_globalExtension.constBegin(); git != gfcend; ++git)
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if (QObject *ext = (*git)->extension(object, iid))
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return ext;
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return 0;
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}
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QT_END_NAMESPACE
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