Say hello to QtQuick module

This change moves the QtQuick 2 types and C++ API (including
SceneGraph) to a new module (AKA library), QtQuick.

99% of this change is moving files from src/declarative to
src/quick, and from tests/auto/declarative to
tests/auto/qtquick2.

The loading of QtQuick 2 ("import QtQuick 2.0") is now delegated to
a plugin, src/imports/qtquick2, just like it's done for QtQuick 1.

All tools, examples, and tests that use QtQuick C++ API have gotten
"QT += quick" or "QT += quick-private" added to their .pro file.

A few additional internal QtDeclarative classes had to be exported
(via Q_DECLARATIVE_PRIVATE_EXPORT) since they're needed by the
QtQuick 2 implementation.

The old header locations (e.g. QtDeclarative/qquickitem.h) will
still be supported for some time, but will produce compile-time
warnings. (To avoid the QtQuick implementation using the
compatibility headers (since QtDeclarative's includepath comes
first), a few include statements were modified, e.g. from
"#include <qsgnode.h>" to "#include <QtQuick/qsgnode.h>".)

There's a change in qtbase that automatically adds QtQuick to the
module list if QtDeclarative is used. Together with the compatibility
headers, this should help reduce the migration pain for existing
projects.

In theory, simply getting an existing QtDeclarative-based project
to compile and link shouldn't require any changes for now -- but
porting to the new scheme is of course recommended, and will
eventually become mandatory.

Task-number: QTBUG-22889
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Change-Id: Ia52be9373172ba2f37e7623231ecb060316c96a7
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

1 files changed, 796 insertions, 0 deletions

diff --git a/src/quick/util/qdeclarativepropertychanges.cpp b/src/quick/util/qdeclarativepropertychanges.cpp
new file mode 100644
index 0000000000..d6035fa9d2
--- /dev/null
+++ b/src/quick/util/qdeclarativepropertychanges.cpp
@@ -0,0 +1,796 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdeclarativepropertychanges_p.h"
+
+#include <private/qdeclarativeopenmetaobject_p.h>
+#include <private/qdeclarativerewrite_p.h>
+#include <private/qdeclarativeengine_p.h>
+
+#include <qdeclarativeinfo.h>
+#include <private/qdeclarativecustomparser_p.h>
+#include <private/qdeclarativescript_p.h>
+#include <qdeclarativeexpression.h>
+#include <private/qdeclarativebinding_p.h>
+#include <qdeclarativecontext.h>
+#include <private/qdeclarativeguard_p.h>
+#include <private/qdeclarativeproperty_p.h>
+#include <private/qdeclarativecontext_p.h>
+#include <private/qdeclarativestate_p_p.h>
+
+#include <QtCore/qdebug.h>
+
+#include <private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \qmlclass PropertyChanges QDeclarativePropertyChanges
+    \inqmlmodule QtQuick 2
+    \ingroup qml-state-elements
+    \brief The PropertyChanges element describes new property bindings or values for a state.
+
+    PropertyChanges is used to define the property values or bindings in a 
+    \l State. This enables an item's property values to be changed when it
+    \l {QML States}{changes between states}.
+
+    To create a PropertyChanges object, specify the \l target item whose 
+    properties are to be modified, and define the new property values or
+    bindings. For example:
+    
+    \snippet doc/src/snippets/declarative/propertychanges.qml import 
+    \codeline
+    \snippet doc/src/snippets/declarative/propertychanges.qml 0
+
+    When the mouse is pressed, the \l Rectangle changes to the \e resized
+    state. In this state, the PropertyChanges object sets the rectangle's 
+    color to blue and the \c height value to that of \c container.height.
+
+    Note this automatically binds \c rect.height to \c container.height 
+    in the \e resized state. If a property binding should not be
+    established, and the height should just be set to the value of
+    \c container.height at the time of the state change, set the \l explicit
+    property to \c true.
+   
+    A PropertyChanges object can also override the default signal handler
+    for an object to implement a signal handler specific to the new state:
+
+    \qml
+    PropertyChanges {
+        target: myMouseArea
+        onClicked: doSomethingDifferent()
+    }
+    \endqml
+
+    \note PropertyChanges can be used to change anchor margins, but not other anchor
+    values; use AnchorChanges for this instead. Similarly, to change an \l Item's
+    \l {Item::}{parent} value, use ParentChanges instead.
+
+
+    \section2 Resetting property values
+
+    The \c undefined value can be used to reset the property value for a state.
+    In the following example, when \c myText changes to the \e widerText
+    state, its \c width property is reset, giving the text its natural width
+    and displaying the whole string on a single line.
+
+    \snippet doc/src/snippets/declarative/propertychanges.qml reset
+
+
+    \section2 Immediate property changes in transitions
+
+    When \l{QML Animation and Transitions}{Transitions} are used to animate
+    state changes, they animate properties from their values in the current
+    state to those defined in the new state (as defined by PropertyChanges
+    objects). However, it is sometimes desirable to set a property value
+    \e immediately during a \l Transition, without animation; in these cases,
+    the PropertyAction element can be used to force an immediate property
+    change.
+
+    See the PropertyAction documentation for more details.
+
+    \sa {declarative/animation/states}{states example}, {qmlstate}{States}, QtDeclarative
+*/
+
+/*!
+    \qmlproperty Object QtQuick2::PropertyChanges::target
+    This property holds the object which contains the properties to be changed.
+*/
+
+class QDeclarativeReplaceSignalHandler : public QDeclarativeActionEvent
+{
+public:
+    QDeclarativeReplaceSignalHandler() : expression(0), reverseExpression(0),
+                                rewindExpression(0), ownedExpression(0) {}
+    ~QDeclarativeReplaceSignalHandler() {
+        delete ownedExpression;
+    }
+
+    virtual QString typeName() const { return QLatin1String("ReplaceSignalHandler"); }
+
+    QDeclarativeProperty property;
+    QDeclarativeExpression *expression;
+    QDeclarativeExpression *reverseExpression;
+    QDeclarativeExpression *rewindExpression;
+    QDeclarativeGuard<QDeclarativeExpression> ownedExpression;
+
+    virtual void execute(Reason) {
+        ownedExpression = QDeclarativePropertyPrivate::setSignalExpression(property, expression);
+        if (ownedExpression == expression)
+            ownedExpression = 0;
+    }
+
+    virtual bool isReversable() { return true; }
+    virtual void reverse(Reason) {
+        ownedExpression = QDeclarativePropertyPrivate::setSignalExpression(property, reverseExpression);
+        if (ownedExpression == reverseExpression)
+            ownedExpression = 0;
+    }
+
+    virtual void saveOriginals() {
+        saveCurrentValues();
+        reverseExpression = rewindExpression;
+    }
+
+    virtual bool needsCopy() { return true; }
+    virtual void copyOriginals(QDeclarativeActionEvent *other)
+    {
+        QDeclarativeReplaceSignalHandler *rsh = static_cast<QDeclarativeReplaceSignalHandler*>(other);
+        saveCurrentValues();
+        if (rsh == this)
+            return;
+        reverseExpression = rsh->reverseExpression;
+        if (rsh->ownedExpression == reverseExpression) {
+            ownedExpression = rsh->ownedExpression;
+            rsh->ownedExpression = 0;
+        }
+    }
+
+    virtual void rewind() {
+        ownedExpression = QDeclarativePropertyPrivate::setSignalExpression(property, rewindExpression);
+        if (ownedExpression == rewindExpression)
+            ownedExpression = 0;
+    }
+    virtual void saveCurrentValues() { 
+        rewindExpression = QDeclarativePropertyPrivate::signalExpression(property);
+    }
+
+    virtual bool override(QDeclarativeActionEvent*other) {
+        if (other == this)
+            return true;
+        if (other->typeName() != typeName())
+            return false;
+        if (static_cast<QDeclarativeReplaceSignalHandler*>(other)->property == property)
+            return true;
+        return false;
+    }
+};
+
+
+class QDeclarativePropertyChangesPrivate : public QDeclarativeStateOperationPrivate
+{
+    Q_DECLARE_PUBLIC(QDeclarativePropertyChanges)
+public:
+    QDeclarativePropertyChangesPrivate() : decoded(true), restore(true),
+                                isExplicit(false) {}
+
+    QDeclarativeGuard<QObject> object;
+    QByteArray data;
+
+    bool decoded : 1;
+    bool restore : 1;
+    bool isExplicit : 1;
+
+    void decode();
+
+    class ExpressionChange {
+    public:
+        ExpressionChange(const QString &_name,
+                         QDeclarativeBinding::Identifier _id,
+                         QDeclarativeExpression *_expr)
+            : name(_name), id(_id), expression(_expr) {}
+        QString name;
+        QDeclarativeBinding::Identifier id;
+        QDeclarativeExpression *expression;
+    };
+
+    QList<QPair<QString, QVariant> > properties;
+    QList<ExpressionChange> expressions;
+    QList<QDeclarativeReplaceSignalHandler*> signalReplacements;
+
+    QDeclarativeProperty property(const QString &);
+};
+
+void
+QDeclarativePropertyChangesParser::compileList(QList<QPair<QString, QVariant> > &list,
+                                     const QString &pre,
+                                     const QDeclarativeCustomParserProperty &prop)
+{
+    QString propName = pre + prop.name();
+
+    QList<QVariant> values = prop.assignedValues();
+    for (int ii = 0; ii < values.count(); ++ii) {
+        const QVariant &value = values.at(ii);
+
+        if (value.userType() == qMetaTypeId<QDeclarativeCustomParserNode>()) {
+            error(qvariant_cast<QDeclarativeCustomParserNode>(value),
+                  QDeclarativePropertyChanges::tr("PropertyChanges does not support creating state-specific objects."));
+            continue;
+        } else if(value.userType() == qMetaTypeId<QDeclarativeCustomParserProperty>()) {
+
+            QDeclarativeCustomParserProperty prop =
+                qvariant_cast<QDeclarativeCustomParserProperty>(value);
+            QString pre = propName + QLatin1Char('.');
+            compileList(list, pre, prop);
+
+        } else {
+            list << qMakePair(propName, value);
+        }
+    }
+}
+
+QByteArray
+QDeclarativePropertyChangesParser::compile(const QList<QDeclarativeCustomParserProperty> &props)
+{
+    QList<QPair<QString, QVariant> > data;
+    for(int ii = 0; ii < props.count(); ++ii)
+        compileList(data, QString(), props.at(ii));
+
+    QByteArray rv;
+    QDataStream ds(&rv, QIODevice::WriteOnly);
+
+    ds << data.count();
+    for(int ii = 0; ii < data.count(); ++ii) {
+        QDeclarativeScript::Variant v = qvariant_cast<QDeclarativeScript::Variant>(data.at(ii).second);
+        QVariant var;
+        bool isScript = v.isScript();
+        QDeclarativeBinding::Identifier id = 0;
+        switch(v.type()) {
+        case QDeclarativeScript::Variant::Boolean:
+            var = QVariant(v.asBoolean());
+            break;
+        case QDeclarativeScript::Variant::Number:
+            var = QVariant(v.asNumber());
+            break;
+        case QDeclarativeScript::Variant::String:
+            var = QVariant(v.asString());
+            break;
+        case QDeclarativeScript::Variant::Invalid:
+        case QDeclarativeScript::Variant::Script:
+            var = QVariant(v.asScript());
+            {
+                // Pre-rewrite the expression
+                id = rewriteBinding(v, data.at(ii).first);
+            }
+            break;
+        }
+
+        ds << data.at(ii).first << isScript << var;
+        if (isScript)
+            ds << id;
+    }
+
+    return rv;
+}
+
+void QDeclarativePropertyChangesPrivate::decode()
+{
+    Q_Q(QDeclarativePropertyChanges);
+    if (decoded)
+        return;
+
+    QDataStream ds(&data, QIODevice::ReadOnly);
+
+    int count;
+    ds >> count;
+    for (int ii = 0; ii < count; ++ii) {
+        QString name;
+        bool isScript;
+        QVariant data;
+        QDeclarativeBinding::Identifier id = QDeclarativeBinding::Invalid;
+        ds >> name;
+        ds >> isScript;
+        ds >> data;
+        if (isScript)
+            ds >> id;
+
+        QDeclarativeProperty prop = property(name);      //### better way to check for signal property?
+        if (prop.type() & QDeclarativeProperty::SignalProperty) {
+            QDeclarativeExpression *expression = new QDeclarativeExpression(qmlContext(q), object, data.toString());
+            QDeclarativeData *ddata = QDeclarativeData::get(q);
+            if (ddata && ddata->outerContext && !ddata->outerContext->url.isEmpty())
+                expression->setSourceLocation(ddata->outerContext->url.toString(), ddata->lineNumber);
+            QDeclarativeReplaceSignalHandler *handler = new QDeclarativeReplaceSignalHandler;
+            handler->property = prop;
+            handler->expression = expression;
+            signalReplacements << handler;
+        } else if (isScript) {
+            QDeclarativeExpression *expression = new QDeclarativeExpression(qmlContext(q), object, data.toString());
+            QDeclarativeData *ddata = QDeclarativeData::get(q);
+            if (ddata && ddata->outerContext && !ddata->outerContext->url.isEmpty())
+                expression->setSourceLocation(ddata->outerContext->url.toString(), ddata->lineNumber);
+            expressions << ExpressionChange(name, id, expression);
+        } else {
+            properties << qMakePair(name, data);
+        }
+    }
+
+    decoded = true;
+    data.clear();
+}
+
+void QDeclarativePropertyChangesParser::setCustomData(QObject *object,
+                                            const QByteArray &data)
+{
+    QDeclarativePropertyChangesPrivate *p =
+        static_cast<QDeclarativePropertyChangesPrivate *>(QObjectPrivate::get(object));
+    p->data = data;
+    p->decoded = false;
+}
+
+QDeclarativePropertyChanges::QDeclarativePropertyChanges()
+: QDeclarativeStateOperation(*(new QDeclarativePropertyChangesPrivate))
+{
+}
+
+QDeclarativePropertyChanges::~QDeclarativePropertyChanges()
+{
+    Q_D(QDeclarativePropertyChanges);
+    for(int ii = 0; ii < d->expressions.count(); ++ii)
+        delete d->expressions.at(ii).expression;
+    for(int ii = 0; ii < d->signalReplacements.count(); ++ii)
+        delete d->signalReplacements.at(ii);
+}
+
+QObject *QDeclarativePropertyChanges::object() const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    return d->object;
+}
+
+void QDeclarativePropertyChanges::setObject(QObject *o)
+{
+    Q_D(QDeclarativePropertyChanges);
+    d->object = o;
+}
+
+/*!
+    \qmlproperty bool QtQuick2::PropertyChanges::restoreEntryValues
+
+    This property holds whether the previous values should be restored when
+    leaving the state. 
+
+    The default value is \c true. Setting this value to \c false creates a
+    temporary state that has permanent effects on property values.
+*/
+bool QDeclarativePropertyChanges::restoreEntryValues() const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    return d->restore;
+}
+
+void QDeclarativePropertyChanges::setRestoreEntryValues(bool v)
+{
+    Q_D(QDeclarativePropertyChanges);
+    d->restore = v;
+}
+
+QDeclarativeProperty
+QDeclarativePropertyChangesPrivate::property(const QString &property)
+{
+    Q_Q(QDeclarativePropertyChanges);
+    QDeclarativeProperty prop(object, property, qmlContext(q));
+    if (!prop.isValid()) {
+        qmlInfo(q) << QDeclarativePropertyChanges::tr("Cannot assign to non-existent property \"%1\"").arg(property);
+        return QDeclarativeProperty();
+    } else if (!(prop.type() & QDeclarativeProperty::SignalProperty) && !prop.isWritable()) {
+        qmlInfo(q) << QDeclarativePropertyChanges::tr("Cannot assign to read-only property \"%1\"").arg(property);
+        return QDeclarativeProperty();
+    }
+    return prop;
+}
+
+QDeclarativePropertyChanges::ActionList QDeclarativePropertyChanges::actions()
+{
+    Q_D(QDeclarativePropertyChanges);
+
+    d->decode();
+
+    ActionList list;
+
+    for (int ii = 0; ii < d->properties.count(); ++ii) {
+
+        QDeclarativeAction a(d->object, d->properties.at(ii).first,
+                 qmlContext(this), d->properties.at(ii).second);
+
+        if (a.property.isValid()) {
+            a.restore = restoreEntryValues();
+            list << a;
+        }
+    }
+
+    for (int ii = 0; ii < d->signalReplacements.count(); ++ii) {
+
+        QDeclarativeReplaceSignalHandler *handler = d->signalReplacements.at(ii);
+
+        if (handler->property.isValid()) {
+            QDeclarativeAction a;
+            a.event = handler;
+            list << a;
+        }
+    }
+
+    for (int ii = 0; ii < d->expressions.count(); ++ii) {
+
+        const QString &property = d->expressions.at(ii).name;
+        QDeclarativeProperty prop = d->property(property);
+
+        if (prop.isValid()) {
+            QDeclarativeAction a;
+            a.restore = restoreEntryValues();
+            a.property = prop;
+            a.fromValue = a.property.read();
+            a.specifiedObject = d->object;
+            a.specifiedProperty = property;
+
+            if (d->isExplicit) {
+                a.toValue = d->expressions.at(ii).expression->evaluate();
+            } else {
+                QDeclarativeExpression *e = d->expressions.at(ii).expression;
+
+                QDeclarativeBinding::Identifier id = d->expressions.at(ii).id;
+                QDeclarativeBinding *newBinding = id != QDeclarativeBinding::Invalid ? QDeclarativeBinding::createBinding(id, object(), qmlContext(this), e->sourceFile(), e->lineNumber()) : 0;
+                if (!newBinding) {
+                    newBinding = new QDeclarativeBinding(e->expression(), object(), qmlContext(this));
+                    newBinding->setSourceLocation(e->sourceFile(), e->lineNumber());
+                }
+                newBinding->setTarget(prop);
+                a.toBinding = newBinding;
+                a.deletableToBinding = true;
+            }
+
+            list << a;
+        }
+    }
+
+    return list;
+}
+
+/*!
+    \qmlproperty bool QtQuick2::PropertyChanges::explicit
+
+    If explicit is set to true, any potential bindings will be interpreted as
+    once-off assignments that occur when the state is entered.
+
+    In the following example, the addition of explicit prevents \c myItem.width from
+    being bound to \c parent.width. Instead, it is assigned the value of \c parent.width
+    at the time of the state change.
+    \qml
+    PropertyChanges {
+        target: myItem
+        explicit: true
+        width: parent.width
+    }
+    \endqml
+
+    By default, explicit is false.
+*/
+bool QDeclarativePropertyChanges::isExplicit() const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    return d->isExplicit;
+}
+
+void QDeclarativePropertyChanges::setIsExplicit(bool e)
+{
+    Q_D(QDeclarativePropertyChanges);
+    d->isExplicit = e;
+}
+
+bool QDeclarativePropertyChanges::containsValue(const QString &name) const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    typedef QPair<QString, QVariant> PropertyEntry;
+
+    QListIterator<PropertyEntry> propertyIterator(d->properties);
+    while (propertyIterator.hasNext()) {
+        const PropertyEntry &entry = propertyIterator.next();
+        if (entry.first == name) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool QDeclarativePropertyChanges::containsExpression(const QString &name) const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    typedef QDeclarativePropertyChangesPrivate::ExpressionChange ExpressionEntry;
+
+    QListIterator<ExpressionEntry> expressionIterator(d->expressions);
+    while (expressionIterator.hasNext()) {
+        const ExpressionEntry &entry = expressionIterator.next();
+        if (entry.name == name) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool QDeclarativePropertyChanges::containsProperty(const QString &name) const
+{
+    return containsValue(name) || containsExpression(name);
+}
+
+void QDeclarativePropertyChanges::changeValue(const QString &name, const QVariant &value)
+{
+    Q_D(QDeclarativePropertyChanges);
+    typedef QPair<QString, QVariant> PropertyEntry;
+    typedef QDeclarativePropertyChangesPrivate::ExpressionChange ExpressionEntry;
+
+    QMutableListIterator<ExpressionEntry> expressionIterator(d->expressions);
+    while (expressionIterator.hasNext()) {
+        const ExpressionEntry &entry = expressionIterator.next();
+        if (entry.name == name) {
+            expressionIterator.remove();
+            if (state() && state()->isStateActive()) {
+                QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::binding(d->property(name));
+                if (oldBinding) {
+                    QDeclarativePropertyPrivate::setBinding(d->property(name), 0);
+                    oldBinding->destroy();
+                }
+                d->property(name).write(value);
+            }
+
+            d->properties.append(PropertyEntry(name, value));
+            return;
+        }
+    }
+
+    QMutableListIterator<PropertyEntry> propertyIterator(d->properties);
+    while (propertyIterator.hasNext()) {
+        PropertyEntry &entry = propertyIterator.next();
+        if (entry.first == name) {
+            entry.second = value;
+            if (state() && state()->isStateActive())
+                d->property(name).write(value);
+            return;
+        }
+    }
+
+    QDeclarativeAction action;
+    action.restore = restoreEntryValues();
+    action.property = d->property(name);
+    action.fromValue = action.property.read();
+    action.specifiedObject = object();
+    action.specifiedProperty = name;
+    action.toValue = value;
+
+    propertyIterator.insert(PropertyEntry(name, value));
+    if (state() && state()->isStateActive()) {
+        state()->addEntryToRevertList(action);
+        QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::binding(action.property);
+        if (oldBinding)
+            oldBinding->setEnabled(false, QDeclarativePropertyPrivate::DontRemoveBinding | QDeclarativePropertyPrivate::BypassInterceptor);
+        d->property(name).write(value);
+    }
+}
+
+void QDeclarativePropertyChanges::changeExpression(const QString &name, const QString &expression)
+{
+    Q_D(QDeclarativePropertyChanges);
+    typedef QPair<QString, QVariant> PropertyEntry;
+    typedef QDeclarativePropertyChangesPrivate::ExpressionChange ExpressionEntry;
+
+    bool hadValue = false;
+
+    QMutableListIterator<PropertyEntry> propertyIterator(d->properties);
+    while (propertyIterator.hasNext()) {
+        PropertyEntry &entry = propertyIterator.next();
+        if (entry.first == name) {
+            propertyIterator.remove();
+            hadValue = true;
+            break;
+        }
+    }
+
+    QMutableListIterator<ExpressionEntry> expressionIterator(d->expressions);
+    while (expressionIterator.hasNext()) {
+        const ExpressionEntry &entry = expressionIterator.next();
+        if (entry.name == name) {
+            entry.expression->setExpression(expression);
+            if (state() && state()->isStateActive()) {
+                QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::binding(d->property(name));
+                if (oldBinding) {
+                       QDeclarativePropertyPrivate::setBinding(d->property(name), 0);
+                       oldBinding->destroy();
+                }
+
+                QDeclarativeBinding *newBinding = new QDeclarativeBinding(expression, object(), qmlContext(this));
+                newBinding->setTarget(d->property(name));
+                QDeclarativePropertyPrivate::setBinding(d->property(name), newBinding, QDeclarativePropertyPrivate::DontRemoveBinding | QDeclarativePropertyPrivate::BypassInterceptor);
+            }
+            return;
+        }
+    }
+
+    QDeclarativeExpression *newExpression = new QDeclarativeExpression(qmlContext(this), d->object, expression);
+    expressionIterator.insert(ExpressionEntry(name, QDeclarativeBinding::Invalid, newExpression));
+
+    if (state() && state()->isStateActive()) {
+        if (hadValue) {
+            QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::binding(d->property(name));
+            if (oldBinding) {
+                oldBinding->setEnabled(false, QDeclarativePropertyPrivate::DontRemoveBinding | QDeclarativePropertyPrivate::BypassInterceptor);
+                state()->changeBindingInRevertList(object(), name, oldBinding);
+            }
+
+            QDeclarativeBinding *newBinding = new QDeclarativeBinding(expression, object(), qmlContext(this));
+            newBinding->setTarget(d->property(name));
+            QDeclarativePropertyPrivate::setBinding(d->property(name), newBinding, QDeclarativePropertyPrivate::DontRemoveBinding | QDeclarativePropertyPrivate::BypassInterceptor);
+        } else {
+            QDeclarativeAction action;
+            action.restore = restoreEntryValues();
+            action.property = d->property(name);
+            action.fromValue = action.property.read();
+            action.specifiedObject = object();
+            action.specifiedProperty = name;
+
+
+            if (d->isExplicit) {
+                action.toValue = newExpression->evaluate();
+            } else {
+                QDeclarativeBinding *newBinding = new QDeclarativeBinding(newExpression->expression(), object(), qmlContext(this));
+                newBinding->setTarget(d->property(name));
+                action.toBinding = newBinding;
+                action.deletableToBinding = true;
+
+                state()->addEntryToRevertList(action);
+                QDeclarativeAbstractBinding *oldBinding = QDeclarativePropertyPrivate::binding(action.property);
+                if (oldBinding)
+                    oldBinding->setEnabled(false, QDeclarativePropertyPrivate::DontRemoveBinding | QDeclarativePropertyPrivate::BypassInterceptor);
+
+                QDeclarativePropertyPrivate::setBinding(action.property, newBinding, QDeclarativePropertyPrivate::DontRemoveBinding | QDeclarativePropertyPrivate::BypassInterceptor);
+            }
+        }
+    }
+    // what about the signal handler?
+}
+
+QVariant QDeclarativePropertyChanges::property(const QString &name) const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    typedef QPair<QString, QVariant> PropertyEntry;
+    typedef QDeclarativePropertyChangesPrivate::ExpressionChange ExpressionEntry;
+
+    QListIterator<PropertyEntry> propertyIterator(d->properties);
+    while (propertyIterator.hasNext()) {
+        const PropertyEntry &entry = propertyIterator.next();
+        if (entry.first == name) {
+            return entry.second;
+        }
+    }
+
+    QListIterator<ExpressionEntry> expressionIterator(d->expressions);
+    while (expressionIterator.hasNext()) {
+        const ExpressionEntry &entry = expressionIterator.next();
+        if (entry.name == name) {
+            return QVariant(entry.expression->expression());
+        }
+    }
+
+    return QVariant();
+}
+
+void QDeclarativePropertyChanges::removeProperty(const QString &name)
+{
+    Q_D(QDeclarativePropertyChanges);
+    typedef QPair<QString, QVariant> PropertyEntry;
+    typedef QDeclarativePropertyChangesPrivate::ExpressionChange ExpressionEntry;
+
+    QMutableListIterator<ExpressionEntry> expressionIterator(d->expressions);
+    while (expressionIterator.hasNext()) {
+        const ExpressionEntry &entry = expressionIterator.next();
+        if (entry.name == name) {
+            expressionIterator.remove();
+            state()->removeEntryFromRevertList(object(), name);
+            return;
+        }
+    }
+
+    QMutableListIterator<PropertyEntry> propertyIterator(d->properties);
+    while (propertyIterator.hasNext()) {
+        const PropertyEntry &entry = propertyIterator.next();
+        if (entry.first == name) {
+            propertyIterator.remove();
+            state()->removeEntryFromRevertList(object(), name);
+            return;
+        }
+    }
+}
+
+QVariant QDeclarativePropertyChanges::value(const QString &name) const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    typedef QPair<QString, QVariant> PropertyEntry;
+
+    QListIterator<PropertyEntry> propertyIterator(d->properties);
+    while (propertyIterator.hasNext()) {
+        const PropertyEntry &entry = propertyIterator.next();
+        if (entry.first == name) {
+            return entry.second;
+        }
+    }
+
+    return QVariant();
+}
+
+QString QDeclarativePropertyChanges::expression(const QString &name) const
+{
+    Q_D(const QDeclarativePropertyChanges);
+    typedef QDeclarativePropertyChangesPrivate::ExpressionChange ExpressionEntry;
+
+    QListIterator<ExpressionEntry> expressionIterator(d->expressions);
+    while (expressionIterator.hasNext()) {
+        const ExpressionEntry &entry = expressionIterator.next();
+        if (entry.name == name) {
+            return entry.expression->expression();
+        }
+    }
+
+    return QString();
+}
+
+void QDeclarativePropertyChanges::detachFromState()
+{
+    if (state())
+        state()->removeAllEntriesFromRevertList(object());
+}
+
+void QDeclarativePropertyChanges::attachToState()
+{
+    if (state())
+        state()->addEntriesToRevertList(actions());
+}
+
+QT_END_NAMESPACE