/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the QtWebChannel module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL21$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see http://www.qt.io/terms-conditions. For further ** information use the contact form at http://www.qt.io/contact-us. ** ** 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 or version 3 as published by the Free ** Software Foundation and appearing in the file LICENSE.LGPLv21 and ** LICENSE.LGPLv3 included in the packaging of this file. Please review the ** following information to ensure the GNU Lesser General Public License ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** As a special exception, The Qt Company gives you certain additional ** rights. These rights are described in The Qt Company LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qwebchannel.h" #include "qwebchannel_p.h" #include "qmetaobjectpublisher_p.h" #include "qwebchannelabstracttransport.h" #include #include QT_BEGIN_NAMESPACE /*! \class QWebChannel \inmodule QtWebChannel \brief Exposes QObjects to remote HTML clients. \since 5.4 The QWebChannel fills the gap between C++ applications and HTML/JavaScript applications. By publishing a QObject derived object to a QWebChannel and using the \l{Qt WebChannel JavaScript API}{qwebchannel.js} on the HTML side, one can transparently access properties and public slots and methods of the QObject. No manual message passing and serialization of data is required, property updates and signal emission on the C++ side get automatically transmitted to the potentially remotely running HTML clients. On the client side, a JavaScript object will be created for any published C++ QObject. It mirrors the C++ object's API and thus is intuitively useable. The C++ QWebChannel API makes it possible to talk to any HTML client, which could run on a local or even remote machine. The only limitation is that the HTML client supports the JavaScript features used by \c{qwebchannel.js}. As such, one can interact with basically any modern HTML browser or standalone JavaScript runtime, such as node.js. There also exists a declarative \l{Qt WebChannel QML Types}{WebChannel API}. \sa {Qt WebChannel Standalone Example}, {Qt WebChannel JavaScript API}{JavaScript API} */ /*! \internal Remove a destroyed transport object from the list of known transports. */ void QWebChannelPrivate::_q_transportDestroyed(QObject *object) { const int idx = transports.indexOf(static_cast(object)); if (idx != -1) { transports.remove(idx); } } /*! \internal Shared code to initialize the QWebChannel from both constructors. */ void QWebChannelPrivate::init() { Q_Q(QWebChannel); publisher = new QMetaObjectPublisher(q); QObject::connect(publisher, SIGNAL(blockUpdatesChanged(bool)), q, SIGNAL(blockUpdatesChanged(bool))); } /*! Constructs the QWebChannel object with the given \a parent. Note that a QWebChannel is only fully operational once you connect it to a QWebChannelAbstractTransport. The HTML clients also need to be setup appropriately using \l{qtwebchannel-javascript.html}{\c qwebchannel.js}. */ QWebChannel::QWebChannel(QObject *parent) : QObject(*(new QWebChannelPrivate), parent) { Q_D(QWebChannel); d->init(); } /*! \internal Construct a QWebChannel from an ancestor class with the given \a parent. \sa QQmlWebChannel */ QWebChannel::QWebChannel(QWebChannelPrivate &dd, QObject *parent) : QObject(dd, parent) { Q_D(QWebChannel); d->init(); } /*! Destroys the QWebChannel. */ QWebChannel::~QWebChannel() { } /*! Registers a group of objects to the QWebChannel. The properties, signals and public invokable methods of the objects are published to the remote clients. There, an object with the identifier used as key in the \a objects map is then constructed. \note A current limitation is that objects must be registered before any client is initialized. \sa QWebChannel::registerObject(), QWebChannel::deregisterObject(), QWebChannel::registeredObjects() */ void QWebChannel::registerObjects(const QHash< QString, QObject * > &objects) { Q_D(QWebChannel); const QHash::const_iterator end = objects.constEnd(); for (QHash::const_iterator it = objects.constBegin(); it != end; ++it) { d->publisher->registerObject(it.key(), it.value()); } } /*! Returns the map of registered objects that are published to remote clients. \sa QWebChannel::registerObjects(), QWebChannel::registerObject(), QWebChannel::deregisterObject() */ QHash QWebChannel::registeredObjects() const { Q_D(const QWebChannel); return d->publisher->registeredObjects; } /*! Registers a single object to the QWebChannel. The properties, signals and public methods of the \a object are published to the remote clients. There, an object with the identifier \a id is then constructed. \note A current limitation is that objects must be registered before any client is initialized. \sa QWebChannel::registerObjects(), QWebChannel::deregisterObject(), QWebChannel::registeredObjects() */ void QWebChannel::registerObject(const QString &id, QObject *object) { Q_D(QWebChannel); d->publisher->registerObject(id, object); } /*! Deregisters the given \a object from the QWebChannel. Remote clients will receive a \c destroyed signal for the given object. \sa QWebChannel::registerObjects(), QWebChannel::registerObject(), QWebChannel::registeredObjects() */ void QWebChannel::deregisterObject(QObject *object) { Q_D(QWebChannel); // handling of deregistration is analogously to handling of a destroyed signal d->publisher->signalEmitted(object, s_destroyedSignalIndex, QVariantList() << QVariant::fromValue(object)); } /*! \property QWebChannel::blockUpdates \brief When set to true, updates are blocked and remote clients will not be notified about property changes. The changes are recorded and sent to the clients once updates become unblocked again by setting this property to false. By default, updates are not blocked. */ bool QWebChannel::blockUpdates() const { Q_D(const QWebChannel); return d->publisher->blockUpdates; } void QWebChannel::setBlockUpdates(bool block) { Q_D(QWebChannel); d->publisher->setBlockUpdates(block); } /*! Connects the QWebChannel to the given \a transport object. The transport object then handles the communication between the C++ application and a remote HTML client. \sa QWebChannelAbstractTransport, QWebChannel::disconnectFrom() */ void QWebChannel::connectTo(QWebChannelAbstractTransport *transport) { Q_D(QWebChannel); Q_ASSERT(transport); if (!d->transports.contains(transport)) { d->transports << transport; connect(transport, &QWebChannelAbstractTransport::messageReceived, d->publisher, &QMetaObjectPublisher::handleMessage, Qt::UniqueConnection); connect(transport, SIGNAL(destroyed(QObject*)), this, SLOT(_q_transportDestroyed(QObject*))); } } /*! Disconnects the QWebChannel from the \a transport object. \sa QWebChannel::connectTo() */ void QWebChannel::disconnectFrom(QWebChannelAbstractTransport *transport) { Q_D(QWebChannel); const int idx = d->transports.indexOf(transport); if (idx != -1) { disconnect(transport, 0, this, 0); disconnect(transport, 0, d->publisher, 0); d->transports.remove(idx); } } QT_END_NAMESPACE #include "moc_qwebchannel.cpp"