| /**************************************************************************** |
| ** |
| ** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com> |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtWebChannel module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
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| ** accordance with the commercial license agreement provided with the |
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| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
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| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
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| ****************************************************************************/ |
| |
| #ifndef SIGNALHANDLER_H |
| #define SIGNALHANDLER_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists for the convenience |
| // of other Qt classes. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include <Qt3DCore/qt3dcore_global.h> |
| #include <QtCore/QDebug> |
| #include <QtCore/QHash> |
| #include <QtCore/QMetaMethod> |
| #include <QtCore/QObject> |
| #include <QtCore/QVector> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace Qt3DCore { |
| |
| class Q_3DCORESHARED_EXPORT PropertyChangeHandlerBase : public QObject |
| { |
| Q_OBJECT |
| public: |
| PropertyChangeHandlerBase(QObject *parent = nullptr); |
| |
| /** |
| * Connect to the change signal of @p property in @p object. |
| */ |
| void connectToPropertyChange(const QObject *object, int propertyIndex); |
| |
| /** |
| * Disconnect from the change signal of @p property in @p object. |
| */ |
| void disconnectFromPropertyChange(const QObject *object, int propertyIndex); |
| }; |
| |
| /** |
| * The property change handler is similar to QSignalSpy, but geared towards the usecase of Qt3D. |
| * |
| * It allows connecting to any number of property change signals of the receiver object and forwards |
| * the signal invocations to the Receiver by calling its propertyChanged function. |
| */ |
| template<class Receiver> |
| class PropertyChangeHandler : public PropertyChangeHandlerBase |
| { |
| public: |
| PropertyChangeHandler(Receiver *receiver, QObject *parent = nullptr); |
| |
| /** |
| * @internal |
| * |
| * Custom implementation of qt_metacall which calls propertyChanged() on the receiver for |
| * connected signals. |
| */ |
| int qt_metacall(QMetaObject::Call call, int methodId, void **args) override; |
| |
| private: |
| Receiver *m_receiver; |
| }; |
| |
| template<class Receiver> |
| PropertyChangeHandler<Receiver>::PropertyChangeHandler(Receiver *receiver, QObject *parent) |
| : PropertyChangeHandlerBase(parent) |
| , m_receiver(receiver) |
| { |
| } |
| |
| template<class Receiver> |
| int PropertyChangeHandler<Receiver>::qt_metacall(QMetaObject::Call call, int methodId, void **args) |
| { |
| methodId = QObject::qt_metacall(call, methodId, args); |
| if (methodId < 0) |
| return methodId; |
| |
| if (call == QMetaObject::InvokeMetaMethod) { |
| m_receiver->propertyChanged(methodId); |
| return -1; |
| } |
| return methodId; |
| } |
| |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif // SIGNALHANDLER_H |