diff -r 93b982ccede2 -r 5daf16870df6 src/declarative/util/qdeclarativeconnections.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/declarative/util/qdeclarativeconnections.cpp	Thu Jul 22 16:41:55 2010 +0100
@@ -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