--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/declarative/util/qdeclarativeconnections.cpp Tue Jul 06 15:10:48 2010 +0300
@@ -0,0 +1,287 @@
+/****************************************************************************
+**
+** 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 QtDeclarative module 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 "private/qdeclarativeconnections_p.h"
+
+#include <qdeclarativeexpression.h>
+#include <qdeclarativeproperty_p.h>
+#include <qdeclarativeboundsignal_p.h>
+#include <qdeclarativecontext.h>
+#include <qdeclarativeinfo.h>
+
+#include <QtCore/qdebug.h>
+#include <QtCore/qstringlist.h>
+
+#include <private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QDeclarativeConnectionsPrivate : public QObjectPrivate
+{
+public:
+ QDeclarativeConnectionsPrivate() : target(0), targetSet(false), ignoreUnknownSignals(false), componentcomplete(true) {}
+
+ QList<QDeclarativeBoundSignal*> boundsignals;
+ QObject *target;
+
+ bool targetSet;
+ bool ignoreUnknownSignals;
+ bool componentcomplete;
+
+ QByteArray data;
+};
+
+/*!
+ \qmlclass Connections QDeclarativeConnections
+ \since 4.7
+ \brief A Connections object describes generalized connections to signals.
+
+ When connecting to signals in QML, the usual way is to create an
+ "on<Signal>" handler that reacts when a signal is received, like this:
+
+ \qml
+ MouseArea {
+ onClicked: { foo(...) }
+ }
+ \endqml
+
+ However, in some cases, it is not possible to connect to a signal in this
+ way, such as:
+
+ \list
+ \i multiple connections to the same signal
+ \i connections outside the scope of the signal sender
+ \i connections to targets not defined in QML
+ \endlist
+
+ When any of these are needed, the Connections object can be used instead.
+
+ For example, the above code can be changed to use a Connections object,
+ like this:
+
+ \qml
+ MouseArea {
+ Connections {
+ onClicked: foo(...)
+ }
+ }
+ \endqml
+
+ More generally, the Connections object can be a child of some other object than
+ the sender of the signal:
+
+ \qml
+ MouseArea {
+ id: area
+ }
+ ...
+ Connections {
+ target: area
+ onClicked: foo(...)
+ }
+ \endqml
+
+ \sa QtDeclarative
+*/
+
+/*!
+ \internal
+ \class QDeclarativeConnections
+ \brief The QDeclarativeConnections class describes generalized connections to signals.
+
+*/
+QDeclarativeConnections::QDeclarativeConnections(QObject *parent) :
+ QObject(*(new QDeclarativeConnectionsPrivate), parent)
+{
+}
+
+QDeclarativeConnections::~QDeclarativeConnections()
+{
+}
+
+/*!
+ \qmlproperty Object Connections::target
+ This property holds the object that sends the signal.
+
+ If not set at all, the target defaults to be the parent of the Connections.
+
+ If set to null, no connection is made and any signal handlers are ignored
+ until the target is not null.
+*/
+QObject *QDeclarativeConnections::target() const
+{
+ Q_D(const QDeclarativeConnections);
+ return d->targetSet ? d->target : parent();
+}
+
+void QDeclarativeConnections::setTarget(QObject *obj)
+{
+ Q_D(QDeclarativeConnections);
+ d->targetSet = true; // even if setting to 0, it is *set*
+ if (d->target == obj)
+ return;
+ foreach (QDeclarativeBoundSignal *s, d->boundsignals) {
+ // It is possible that target is being changed due to one of our signal
+ // handlers -> use deleteLater().
+ if (s->isEvaluating())
+ s->deleteLater();
+ else
+ delete s;
+ }
+ d->boundsignals.clear();
+ d->target = obj;
+ connectSignals();
+ emit targetChanged();
+}
+
+/*!
+ \qmlproperty bool Connections::ignoreUnknownSignals
+
+ Normally, you will get a runtime error if you try to connect
+ to signals on an object which the object does not have.
+
+ By setting this flag to true, such errors are ignored. This is
+ useful if you intend to connect to different types of object, handling
+ a different set of signals for each.
+*/
+bool QDeclarativeConnections::ignoreUnknownSignals() const
+{
+ Q_D(const QDeclarativeConnections);
+ return d->ignoreUnknownSignals;
+}
+
+void QDeclarativeConnections::setIgnoreUnknownSignals(bool ignore)
+{
+ Q_D(QDeclarativeConnections);
+ d->ignoreUnknownSignals = ignore;
+}
+
+
+
+QByteArray
+QDeclarativeConnectionsParser::compile(const QList<QDeclarativeCustomParserProperty> &props)
+{
+ QByteArray rv;
+ QDataStream ds(&rv, QIODevice::WriteOnly);
+
+ for(int ii = 0; ii < props.count(); ++ii)
+ {
+ QString propName = QString::fromUtf8(props.at(ii).name());
+ if (!propName.startsWith(QLatin1String("on")) || !propName.at(2).isUpper()) {
+ error(props.at(ii), QDeclarativeConnections::tr("Cannot assign to non-existent property \"%1\"").arg(propName));
+ return QByteArray();
+ }
+
+ QList<QVariant> values = props.at(ii).assignedValues();
+
+ for (int i = 0; i < values.count(); ++i) {
+ const QVariant &value = values.at(i);
+
+ if (value.userType() == qMetaTypeId<QDeclarativeCustomParserNode>()) {
+ error(props.at(ii), QDeclarativeConnections::tr("Connections: nested objects not allowed"));
+ return QByteArray();
+ } else if (value.userType() == qMetaTypeId<QDeclarativeCustomParserProperty>()) {
+ error(props.at(ii), QDeclarativeConnections::tr("Connections: syntax error"));
+ return QByteArray();
+ } else {
+ QDeclarativeParser::Variant v = qvariant_cast<QDeclarativeParser::Variant>(value);
+ if (v.isScript()) {
+ ds << propName;
+ ds << v.asScript();
+ } else {
+ error(props.at(ii), QDeclarativeConnections::tr("Connections: script expected"));
+ return QByteArray();
+ }
+ }
+ }
+ }
+
+ return rv;
+}
+
+void QDeclarativeConnectionsParser::setCustomData(QObject *object,
+ const QByteArray &data)
+{
+ QDeclarativeConnectionsPrivate *p =
+ static_cast<QDeclarativeConnectionsPrivate *>(QObjectPrivate::get(object));
+ p->data = data;
+}
+
+
+void QDeclarativeConnections::connectSignals()
+{
+ Q_D(QDeclarativeConnections);
+ if (!d->componentcomplete || (d->targetSet && !target()))
+ return;
+
+ QDataStream ds(d->data);
+ while (!ds.atEnd()) {
+ QString propName;
+ ds >> propName;
+ QString script;
+ ds >> script;
+ QDeclarativeProperty prop(target(), propName);
+ if (prop.isValid() && (prop.type() & QDeclarativeProperty::SignalProperty)) {
+ QDeclarativeBoundSignal *signal =
+ new QDeclarativeBoundSignal(target(), prop.method(), this);
+ signal->setExpression(new QDeclarativeExpression(qmlContext(this), 0, script));
+ d->boundsignals += signal;
+ } else {
+ if (!d->ignoreUnknownSignals)
+ qmlInfo(this) << tr("Cannot assign to non-existent property \"%1\"").arg(propName);
+ }
+ }
+}
+
+void QDeclarativeConnections::classBegin()
+{
+ Q_D(QDeclarativeConnections);
+ d->componentcomplete=false;
+}
+
+void QDeclarativeConnections::componentComplete()
+{
+ Q_D(QDeclarativeConnections);
+ d->componentcomplete=true;
+ connectSignals();
+}
+
+QT_END_NAMESPACE