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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

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     7 ** This file is part of the Qt Designer of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

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    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #ifndef EXTENSION_H

    43 #define EXTENSION_H

    44 

    45 #include <QtCore/QString>

    46 #include <QtCore/QObject>

    47 

    48 QT_BEGIN_HEADER

    49 

    50 QT_BEGIN_NAMESPACE

    51 

    52 #define Q_TYPEID(IFace) QLatin1String(IFace##_iid)

    53 

    54 class QAbstractExtensionFactory

    55 {

    56 public:

    57     virtual ~QAbstractExtensionFactory() {}

    58 

    59     virtual QObject *extension(QObject *object, const QString &iid) const = 0;

    60 };

    61 Q_DECLARE_INTERFACE(QAbstractExtensionFactory, "com.trolltech.Qt.QAbstractExtensionFactory")

    62 

    63 class QAbstractExtensionManager

    64 {

    65 public:

    66     virtual ~QAbstractExtensionManager() {}

    67 

    68     virtual void registerExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;

    69     virtual void unregisterExtensions(QAbstractExtensionFactory *factory, const QString &iid) = 0;

    70 

    71     virtual QObject *extension(QObject *object, const QString &iid) const = 0;

    72 };

    73 Q_DECLARE_INTERFACE(QAbstractExtensionManager, "com.trolltech.Qt.QAbstractExtensionManager")

    74 

    75 #if defined(Q_CC_MSVC) && (_MSC_VER < 1300)

    76 

    77 template <class T>

    78 inline T qt_extension_helper(QAbstractExtensionManager *, QObject *, T)

    79 { return 0; }

    80 

    81 template <class T>

    82 inline T qt_extension(QAbstractExtensionManager* manager, QObject *object)

    83 { return qt_extension_helper(manager, object, T(0)); }

    84 

    85 #define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \

    86 const char * const IFace##_iid = IId; \

    87 Q_DECLARE_INTERFACE(IFace, IId) \

    88 template <> inline IFace *qt_extension_helper<IFace *>(QAbstractExtensionManager *manager, QObject *object, IFace *) \

    89 { QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return (IFace *)(extension ? extension->qt_metacast(IFace##_iid) : 0); }

    90 

    91 #else

    92 

    93 template <class T>

    94 inline T qt_extension(QAbstractExtensionManager* manager, QObject *object)

    95 { return 0; }

    96 

    97 #define Q_DECLARE_EXTENSION_INTERFACE(IFace, IId) \

    98 const char * const IFace##_iid = IId; \

    99 Q_DECLARE_INTERFACE(IFace, IId) \

   100 template <> inline IFace *qt_extension<IFace *>(QAbstractExtensionManager *manager, QObject *object) \

   101 { QObject *extension = manager->extension(object, Q_TYPEID(IFace)); return extension ? static_cast<IFace *>(extension->qt_metacast(IFace##_iid)) : static_cast<IFace *>(0); }

   102 

   103 #endif

   104 

   105 QT_END_NAMESPACE

   106 

   107 QT_END_HEADER

   108 

   109 #endif // EXTENSION_H