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/****************************************************************************
**
** Copyright (C) 2010 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 <QtDesigner/default_extensionfactory.h>
#include "qextensionmanager.h"
#include <qpointer.h>
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
/*!
\class QExtensionFactory
\brief The QExtensionFactory class allows you to create a factory
that is able to make instances of custom extensions in Qt
Designer.
\inmodule QtDesigner
In \QD the extensions are not created until they are required. For
that reason, when implementing a custom 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 \l
{QExtensionManager}{extension manager}.
The QExtensionManager class provides extension management
facilities for Qt Designer. When an extension is required, Qt
Designer'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 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 Qt Designer:
QDesignerContainerExtension , QDesignerMemberSheetExtension,
QDesignerPropertySheetExtension and QDesignerTaskMenuExtension. Qt
Designer'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.
You can either create a new QExtensionFactory and reimplement the
QExtensionFactory::createExtension() function. For example:
\snippet doc/src/snippets/code/tools_designer_src_lib_extension_default_extensionfactory.cpp 0
Or you can use an existing factory, expanding the
QExtensionFactory::createExtension() function to make the factory
able to create your extension as well. For example:
\snippet doc/src/snippets/code/tools_designer_src_lib_extension_default_extensionfactory.cpp 1
For a complete example using the QExtensionFactory 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 Qt Designer's task menu.
\sa QExtensionManager, QAbstractExtensionFactory
*/
/*!
Constructs an extension factory with the given \a parent.
*/
QExtensionFactory::QExtensionFactory(QExtensionManager *parent)
: QObject(parent)
{
}
/*!
Returns the extension specified by \a iid for the given \a object.
\sa createExtension()
*/
QObject *QExtensionFactory::extension(QObject *object, const QString &iid) const
{
if (!object)
return 0;
const IdObjectKey key = qMakePair(iid, object);
ExtensionMap::iterator it = m_extensions.find(key);
if (it == m_extensions.end()) {
if (QObject *ext = createExtension(object, iid, const_cast<QExtensionFactory*>(this))) {
connect(ext, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));
it = m_extensions.insert(key, ext);
}
}
if (!m_extended.contains(object)) {
connect(object, SIGNAL(destroyed(QObject*)), this, SLOT(objectDestroyed(QObject*)));
m_extended.insert(object, true);
}
if (it == m_extensions.end())
return 0;
return it.value();
}
void QExtensionFactory::objectDestroyed(QObject *object)
{
QMutableMapIterator< IdObjectKey, QObject*> it(m_extensions);
while (it.hasNext()) {
it.next();
QObject *o = it.key().second;
if (o == object || object == it.value()) {
it.remove();
}
}
m_extended.remove(object);
}
/*!
Creates an extension specified by \a iid for the given \a object.
The extension object is created as a child of the specified \a
parent.
\sa extension()
*/
QObject *QExtensionFactory::createExtension(QObject *object, const QString &iid, QObject *parent) const
{
Q_UNUSED(object);
Q_UNUSED(iid);
Q_UNUSED(parent);
return 0;
}
/*!
Returns the extension manager for the extension factory.
*/
QExtensionManager *QExtensionFactory::extensionManager() const
{
return static_cast<QExtensionManager *>(parent());
}
QT_END_NAMESPACE
|
