Change class prefix to from QmlXXX to QDeclarativeXXX, QmlGraphicsXXX to QDeclarativeXXX.

1 files changed, 810 insertions, 0 deletions

diff --git a/src/declarative/qml/qdeclarativeexpression.cpp b/src/declarative/qml/qdeclarativeexpression.cpp
new file mode 100644
index 0000000..ae1e790
--- /dev/null
+++ b/src/declarative/qml/qdeclarativeexpression.cpp
@@ -0,0 +1,810 @@
+/****************************************************************************
+**
+** 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 "qdeclarativeexpression.h"
+#include "qdeclarativeexpression_p.h"
+
+#include "qdeclarativeengine_p.h"
+#include "qdeclarativecontext_p.h"
+#include "qdeclarativerewrite_p.h"
+#include "qdeclarativecompiler_p.h"
+
+#include <QtCore/qdebug.h>
+#include <QtScript/qscriptprogram.h>
+
+#include <private/qscriptdeclarativeclass_p.h>
+
+QT_BEGIN_NAMESPACE
+
+bool QDeclarativeDelayedError::addError(QDeclarativeEnginePrivate *e)
+{
+    if (!e || prevError) return false;
+
+    if (e->inProgressCreations == 0) return false; // Not in construction
+
+    prevError = &e->erroredBindings;
+    nextError = e->erroredBindings;
+    e->erroredBindings = this;
+    if (nextError) nextError->prevError = &nextError;
+
+    return true;
+}
+
+QDeclarativeExpressionData::QDeclarativeExpressionData()
+: q(0), dataRef(0), expressionFunctionValid(false), expressionRewritten(false), me(0), 
+  trackChange(false), isShared(false), line(-1), guardList(0), guardListLength(0)
+{
+}
+
+QDeclarativeExpressionData::~QDeclarativeExpressionData()
+{
+    if (guardList) { delete [] guardList; guardList = 0; }
+    if (dataRef) dataRef->release();
+}
+
+QDeclarativeExpressionPrivate::QDeclarativeExpressionPrivate()
+: data(new QDeclarativeExpressionData)
+{
+    data->q = this;
+}
+
+QDeclarativeExpressionPrivate::QDeclarativeExpressionPrivate(QDeclarativeExpressionData *d)
+: data(d)
+{
+    data->q = this;
+}
+
+QDeclarativeExpressionPrivate::~QDeclarativeExpressionPrivate()
+{
+    if (data) { data->q = 0; data->release(); data = 0; }
+}
+
+void QDeclarativeExpressionPrivate::init(QDeclarativeContext *ctxt, const QString &expr, 
+                                QObject *me)
+{
+    data->expression = expr;
+
+    data->QDeclarativeAbstractExpression::setContext(ctxt);
+    data->me = me;
+}
+
+void QDeclarativeExpressionPrivate::init(QDeclarativeContext *ctxt, void *expr, QDeclarativeRefCount *rc, 
+                                QObject *me, const QString &url, int lineNumber)
+{
+    data->url = url;
+    data->line = lineNumber;
+
+    if (data->dataRef) data->dataRef->release();
+    data->dataRef = rc;
+    if (data->dataRef) data->dataRef->addref();
+
+    quint32 *exprData = (quint32 *)expr;
+    QDeclarativeCompiledData *dd = (QDeclarativeCompiledData *)rc;
+
+    data->expressionRewritten = true;
+    data->expression = QString::fromRawData((QChar *)(exprData + 2), exprData[1]);
+
+    int progIdx = *(exprData);
+    bool isShared = progIdx & 0x80000000;
+    progIdx &= 0x7FFFFFFF;
+
+    QDeclarativeEngine *engine = ctxt->engine();
+    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(engine);
+    QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);
+
+    if (isShared) {
+
+        if (!dd->cachedClosures.at(progIdx)) {
+            QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
+            scriptContext->pushScope(ep->contextClass->newSharedContext());
+            dd->cachedClosures[progIdx] = new QScriptValue(scriptEngine->evaluate(data->expression, data->url, data->line));
+            scriptEngine->popContext();
+        }
+
+        data->expressionFunction = *dd->cachedClosures.at(progIdx);
+        data->isShared = true;
+        data->expressionFunctionValid = true;
+
+    } else {
+
+#if !defined(Q_OS_SYMBIAN) //XXX Why doesn't this work?
+        if (!dd->cachedPrograms.at(progIdx)) {
+            dd->cachedPrograms[progIdx] =
+                new QScriptProgram(data->expression, data->url, data->line);
+        }
+
+        data->expressionFunction = evalInObjectScope(ctxt, me, *dd->cachedPrograms.at(progIdx));
+#else
+        data->expressionFunction = evalInObjectScope(ctxt, me, data->expression);
+#endif
+
+        data->expressionFunctionValid = true;
+    }
+
+    data->QDeclarativeAbstractExpression::setContext(ctxt);
+    data->me = me;
+}
+
+QScriptValue QDeclarativeExpressionPrivate::evalInObjectScope(QDeclarativeContext *context, QObject *object, 
+                                                     const QString &program)
+{
+    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context->engine());
+    QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(&ep->scriptEngine);
+    scriptContext->pushScope(ep->contextClass->newContext(context, object));
+    QScriptValue rv = ep->scriptEngine.evaluate(program);
+    ep->scriptEngine.popContext();
+    return rv;
+}
+
+QScriptValue QDeclarativeExpressionPrivate::evalInObjectScope(QDeclarativeContext *context, QObject *object, 
+                                                     const QScriptProgram &program)
+{
+    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context->engine());
+    QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(&ep->scriptEngine);
+    scriptContext->pushScope(ep->contextClass->newContext(context, object));
+    QScriptValue rv = ep->scriptEngine.evaluate(program);
+    ep->scriptEngine.popContext();
+    return rv;
+}
+
+/*!
+    \class QDeclarativeExpression
+  \since 4.7
+    \brief The QDeclarativeExpression class evaluates JavaScript in a QML context.
+*/
+
+/*!
+    Create an invalid QDeclarativeExpression.
+
+    As the expression will not have an associated QDeclarativeContext, this will be a
+    null expression object and its value will always be an invalid QVariant.
+ */
+QDeclarativeExpression::QDeclarativeExpression()
+: QObject(*new QDeclarativeExpressionPrivate, 0)
+{
+}
+
+/*!  \internal */
+QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContext *ctxt, void *expr,
+                             QDeclarativeRefCount *rc, QObject *me, 
+                             const QString &url, int lineNumber,
+                             QDeclarativeExpressionPrivate &dd)
+: QObject(dd, 0)
+{
+    Q_D(QDeclarativeExpression);
+    d->init(ctxt, expr, rc, me, url, lineNumber);
+}
+
+/*!
+    Create a QDeclarativeExpression object.
+
+    The \a expression JavaScript will be executed in the \a ctxt QDeclarativeContext.
+    If specified, the \a scope object's properties will also be in scope during
+    the expression's execution.
+*/
+QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContext *ctxt, const QString &expression,
+                             QObject *scope)
+: QObject(*new QDeclarativeExpressionPrivate, 0)
+{
+    Q_D(QDeclarativeExpression);
+    d->init(ctxt, expression, scope);
+}
+
+/*!  \internal */
+QDeclarativeExpression::QDeclarativeExpression(QDeclarativeContext *ctxt, const QString &expression,
+                             QObject *scope, QDeclarativeExpressionPrivate &dd)
+: QObject(dd, 0)
+{
+    Q_D(QDeclarativeExpression);
+    d->init(ctxt, expression, scope);
+}
+
+/*!
+    Destroy the QDeclarativeExpression instance.
+*/
+QDeclarativeExpression::~QDeclarativeExpression()
+{
+}
+
+/*!
+    Returns the QDeclarativeEngine this expression is associated with, or 0 if there
+    is no association or the QDeclarativeEngine has been destroyed.
+*/
+QDeclarativeEngine *QDeclarativeExpression::engine() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->context()?d->data->context()->engine():0;
+}
+
+/*!
+    Returns the QDeclarativeContext this expression is associated with, or 0 if there
+    is no association or the QDeclarativeContext has been destroyed.
+*/
+QDeclarativeContext *QDeclarativeExpression::context() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->context();
+}
+
+/*!
+    Returns the expression string.
+*/
+QString QDeclarativeExpression::expression() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->expression;
+}
+
+/*!
+    Set the expression to \a expression.
+*/
+void QDeclarativeExpression::setExpression(const QString &expression)
+{
+    Q_D(QDeclarativeExpression);
+
+    d->clearGuards();
+
+    d->data->expression = expression;
+    d->data->expressionFunctionValid = false;
+    d->data->expressionRewritten = false;
+    d->data->expressionFunction = QScriptValue();
+}
+
+void QDeclarativeExpressionPrivate::exceptionToError(QScriptEngine *scriptEngine, 
+                                            QDeclarativeError &error)
+{
+    if (scriptEngine->hasUncaughtException() && 
+        scriptEngine->uncaughtException().isError()) {
+
+        QString fileName;
+        int lineNumber = scriptEngine->uncaughtExceptionLineNumber();
+
+        QScriptValue exception = scriptEngine->uncaughtException();
+        QLatin1String fileNameProp("fileName");
+
+        if (!exception.property(fileNameProp).toString().isEmpty()){
+            fileName = exception.property(fileNameProp).toString();
+        } else {
+            fileName = QLatin1String("<Unknown File>");
+        }
+
+        error.setUrl(QUrl(fileName));
+        error.setLine(lineNumber);
+        error.setColumn(-1);
+        error.setDescription(exception.toString());
+    } else {
+        error = QDeclarativeError();
+    }
+}
+
+QVariant QDeclarativeExpressionPrivate::evalQtScript(QObject *secondaryScope, bool *isUndefined)
+{
+#ifdef Q_ENABLE_PERFORMANCE_LOG
+    QDeclarativePerfTimer<QDeclarativePerf::BindValueQt> perfqt;
+#endif
+
+    QDeclarativeExpressionData *data = this->data;
+    QDeclarativeContextPrivate *ctxtPriv = data->context()->d_func();
+    QDeclarativeEngine *engine = data->context()->engine();
+    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(engine);
+
+    if (secondaryScope)
+       ctxtPriv->defaultObjects.append(secondaryScope);
+
+    QScriptEngine *scriptEngine = QDeclarativeEnginePrivate::getScriptEngine(engine);
+
+    if (!data->expressionFunctionValid) {
+
+        QScriptContext *scriptContext = QScriptDeclarativeClass::pushCleanContext(scriptEngine);
+        scriptContext->pushScope(ep->contextClass->newContext(data->context(), data->me));
+
+        if (data->expressionRewritten) {
+            data->expressionFunction = scriptEngine->evaluate(data->expression, 
+                                                              data->url, data->line);
+        } else {
+            QDeclarativeRewrite::RewriteBinding rewriteBinding;
+
+            bool ok = true;
+            const QString code = rewriteBinding(data->expression, &ok);
+            if (!ok) {
+                scriptEngine->popContext();
+                return QVariant();
+            }
+            data->expressionFunction = scriptEngine->evaluate(code, data->url, data->line);
+        }
+
+        scriptEngine->popContext();
+        data->expressionFunctionValid = true;
+    }
+
+    QDeclarativeContext *oldSharedContext = 0;
+    QObject *oldSharedScope = 0;
+    if (data->isShared) {
+        oldSharedContext = ep->sharedContext;
+        oldSharedScope = ep->sharedScope;
+        ep->sharedContext = data->context();
+        ep->sharedScope = data->me;
+    }
+
+    QScriptValue svalue = data->expressionFunction.call();
+
+    if (data->isShared) {
+        ep->sharedContext = oldSharedContext;
+        ep->sharedScope = oldSharedScope;
+    }
+
+    if (isUndefined)
+        *isUndefined = svalue.isUndefined() || scriptEngine->hasUncaughtException();
+
+    // Handle exception
+    if (scriptEngine->hasUncaughtException()) {
+       exceptionToError(scriptEngine, data->error);
+       scriptEngine->clearExceptions();
+       return QVariant();
+    } else {
+        data->error = QDeclarativeError();
+    }
+
+    if (secondaryScope) {
+        QObject *last = ctxtPriv->defaultObjects.takeLast();
+        Q_ASSERT(last == secondaryScope);
+        Q_UNUSED(last);
+    }
+
+    QVariant rv;
+
+    if (svalue.isArray()) {
+        int length = svalue.property(QLatin1String("length")).toInt32();
+        if (length && svalue.property(0).isObject()) {
+            QList<QObject *> list;
+            for (int ii = 0; ii < length; ++ii) {
+                QScriptValue arrayItem = svalue.property(ii);
+                QObject *d = arrayItem.toQObject();
+                list << d;
+            }
+            rv = QVariant::fromValue(list);
+        }
+    } else if (svalue.isObject() &&
+               ep->objectClass->scriptClass(svalue) == ep->objectClass) {
+        QObject *o = svalue.toQObject();
+        int type = QMetaType::QObjectStar;
+        // If the object is null, we extract the predicted type.  While this isn't
+        // 100% reliable, in many cases it gives us better error messages if we
+        // assign this null-object to an incompatible property
+        if (!o) type = ep->objectClass->objectType(svalue);
+
+        return QVariant(type, &o);
+    }
+
+    if (rv.isNull())
+        rv = svalue.toVariant();
+
+    return rv;
+}
+
+QVariant QDeclarativeExpressionPrivate::value(QObject *secondaryScope, bool *isUndefined)
+{
+    Q_Q(QDeclarativeExpression);
+
+    QVariant rv;
+    if (!q->engine()) {
+        qWarning("QDeclarativeExpression: Attempted to evaluate an expression in an invalid context");
+        return rv;
+    }
+
+    if (data->expression.isEmpty())
+        return rv;
+
+#ifdef Q_ENABLE_PERFORMANCE_LOG
+    QDeclarativePerfTimer<QDeclarativePerf::BindValue> perf;
+#endif
+
+    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(q->engine());
+
+    QDeclarativeExpression *lastCurrentExpression = ep->currentExpression;
+    bool lastCaptureProperties = ep->captureProperties;
+    QPODVector<QDeclarativeEnginePrivate::CapturedProperty> lastCapturedProperties;
+    ep->capturedProperties.copyAndClear(lastCapturedProperties);
+
+    ep->currentExpression = q;
+    ep->captureProperties = data->trackChange;
+
+    // This object might be deleted during the eval
+    QDeclarativeExpressionData *localData = data;
+    localData->addref();
+
+    rv = evalQtScript(secondaryScope, isUndefined);
+
+    ep->currentExpression = lastCurrentExpression;
+    ep->captureProperties = lastCaptureProperties;
+
+    // Check if we were deleted
+    if (localData->q) {
+        if ((!data->trackChange || !ep->capturedProperties.count()) && data->guardList) {
+            clearGuards();
+        } else if(data->trackChange) {
+            updateGuards(ep->capturedProperties);
+        }
+    }
+
+    localData->release();
+
+    lastCapturedProperties.copyAndClear(ep->capturedProperties);
+
+    return rv;
+}
+
+/*!
+    Returns the value of the expression, or an invalid QVariant if the
+    expression is invalid or has an error.
+
+    \a isUndefined is set to true if the expression resulted in an
+    undefined value.
+
+    \sa hasError(), error()
+*/
+QVariant QDeclarativeExpression::value(bool *isUndefined)
+{
+    Q_D(QDeclarativeExpression);
+    return d->value(0, isUndefined);
+}
+
+/*!
+Returns true if the valueChanged() signal is emitted when the expression's evaluated
+value changes.
+*/
+bool QDeclarativeExpression::notifyOnValueChanged() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->trackChange;
+}
+
+/*!
+Sets whether the valueChanged() signal is emitted when the expression's evaluated
+value changes.
+
+If true, the QDeclarativeExpression will monitor properties involved in the expression's 
+evaluation, and emit QDeclarativeExpression::valueChanged() if they have changed.  This allows 
+an application to ensure that any value associated with the result of the expression 
+remains up to date.
+
+If false, the QDeclarativeExpression will not montitor properties involved in the expression's 
+evaluation, and QDeclarativeExpression::valueChanged() will never be emitted.  This is more efficient 
+if an application wants a "one off" evaluation of the expression.
+
+By default, notifyOnChange is false.
+*/
+void QDeclarativeExpression::setNotifyOnValueChanged(bool notifyOnChange)
+{
+    Q_D(QDeclarativeExpression);
+    d->data->trackChange = notifyOnChange;
+}
+
+/*!
+    Returns the source file URL for this expression.  The source location must
+    have been previously set by calling setSourceLocation().
+*/
+QString QDeclarativeExpression::sourceFile() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->url;
+}
+
+/*!
+    Returns the source file line number for this expression.  The source location 
+    must have been previously set by calling setSourceLocation().
+*/
+int QDeclarativeExpression::lineNumber() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->line;
+}
+
+/*!
+    Set the location of this expression to \a line of \a url. This information
+    is used by the script engine.
+*/
+void QDeclarativeExpression::setSourceLocation(const QString &url, int line)
+{
+    Q_D(QDeclarativeExpression);
+    d->data->url = url;
+    d->data->line = line;
+}
+
+/*!
+    Returns the expression's scope object, if provided, otherwise 0.
+
+    In addition to data provided by the expression's QDeclarativeContext, the scope
+    object's properties are also in scope during the expression's evaluation.
+*/
+QObject *QDeclarativeExpression::scopeObject() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->me;
+}
+
+/*!
+    Returns true if the last call to value() resulted in an error, 
+    otherwise false.
+    
+    \sa error(), clearError()
+*/
+bool QDeclarativeExpression::hasError() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->error.isValid();
+}
+
+/*!
+    Clear any expression errors.  Calls to hasError() following this will
+    return false.
+
+    \sa hasError(), error()
+*/
+void QDeclarativeExpression::clearError()
+{
+    Q_D(QDeclarativeExpression);
+    d->data->error = QDeclarativeError();
+}
+
+/*!
+    Return any error from the last call to value().  If there was no error,
+    this returns an invalid QDeclarativeError instance.
+
+    \sa hasError(), clearError()
+*/
+
+QDeclarativeError QDeclarativeExpression::error() const
+{
+    Q_D(const QDeclarativeExpression);
+    return d->data->error;
+}
+
+/*! \internal */
+void QDeclarativeExpression::__q_notify()
+{
+    Q_D(QDeclarativeExpression);
+    d->emitValueChanged();
+}
+
+void QDeclarativeExpressionPrivate::clearGuards()
+{
+    Q_Q(QDeclarativeExpression);
+
+    static int notifyIdx = -1;
+    if (notifyIdx == -1) 
+        notifyIdx = 
+            QDeclarativeExpression::staticMetaObject.indexOfMethod("__q_notify()");
+
+    for (int ii = 0; ii < data->guardListLength; ++ii) {
+        if (data->guardList[ii].data()) {
+#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 2))
+            QMetaObject::disconnectOne(data->guardList[ii].data(), 
+                                       data->guardList[ii].notifyIndex, 
+                                       q, notifyIdx);
+#else
+            // QTBUG-6781
+            QMetaObject::disconnect(data->guardList[ii].data(), 
+                                    data->guardList[ii].notifyIndex, 
+                                    q, notifyIdx);
+#endif
+        }
+    }
+
+    delete [] data->guardList; data->guardList = 0; 
+    data->guardListLength = 0;
+}
+
+void QDeclarativeExpressionPrivate::updateGuards(const QPODVector<QDeclarativeEnginePrivate::CapturedProperty> &properties)
+{
+    //clearGuards();
+    Q_Q(QDeclarativeExpression);
+
+    static int notifyIdx = -1;
+    if (notifyIdx == -1) 
+        notifyIdx = 
+            QDeclarativeExpression::staticMetaObject.indexOfMethod("__q_notify()");
+
+    QDeclarativeExpressionData::SignalGuard *newGuardList = 0;
+    
+    if (properties.count() != data->guardListLength)
+        newGuardList = new QDeclarativeExpressionData::SignalGuard[properties.count()];
+
+    bool outputWarningHeader = false;
+    int hit = 0;
+    for (int ii = 0; ii < properties.count(); ++ii) {
+        const QDeclarativeEnginePrivate::CapturedProperty &property = properties.at(ii);
+
+        bool needGuard = true;
+        if (ii >= data->guardListLength) {
+            // New guard
+        } else if(data->guardList[ii].data() == property.object && 
+                  data->guardList[ii].notifyIndex == property.notifyIndex) {
+            // Cache hit
+            if (!data->guardList[ii].isDuplicate || 
+                (data->guardList[ii].isDuplicate && hit == ii)) {
+                needGuard = false;
+                ++hit;
+            }
+        } else if(data->guardList[ii].data() && !data->guardList[ii].isDuplicate) {
+            // Cache miss
+#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 2))
+            QMetaObject::disconnectOne(data->guardList[ii].data(), 
+                                       data->guardList[ii].notifyIndex, 
+                                       q, notifyIdx);
+#else
+            // QTBUG-6781
+            QMetaObject::disconnect(data->guardList[ii].data(), 
+                                    data->guardList[ii].notifyIndex, 
+                                    q, notifyIdx);
+#endif
+        } 
+        /* else {
+            // Cache miss, but nothing to do
+        } */
+
+        if (needGuard) {
+            if (!newGuardList) {
+                newGuardList = new QDeclarativeExpressionData::SignalGuard[properties.count()];
+                for (int jj = 0; jj < ii; ++jj)
+                    newGuardList[jj] = data->guardList[jj];
+            }
+
+            if (property.notifyIndex != -1) {
+                bool existing = false;
+                for (int jj = 0; !existing && jj < ii; ++jj) 
+                    existing = newGuardList[jj].data() == property.object &&
+                        newGuardList[jj].notifyIndex == property.notifyIndex;
+
+                newGuardList[ii] = property.object;
+                newGuardList[ii].notifyIndex = property.notifyIndex;
+                if (existing)
+                    newGuardList[ii].isDuplicate = true;
+                else
+                    QMetaObject::connect(property.object, property.notifyIndex,
+                                         q, notifyIdx);
+            } else {
+                if (!outputWarningHeader) {
+                    outputWarningHeader = true;
+                    qWarning() << "QDeclarativeExpression: Expression" << q->expression()
+                               << "depends on non-NOTIFYable properties:";
+                }
+
+                const QMetaObject *metaObj = property.object->metaObject();
+                QMetaProperty metaProp = metaObj->property(property.coreIndex);
+
+                qWarning().nospace() << "    " << metaObj->className()
+                                     << "::" << metaProp.name();
+            }
+        } else if (newGuardList) {
+            newGuardList[ii] = data->guardList[ii];
+        }
+    }
+
+    for (int ii = properties.count(); ii < data->guardListLength; ++ii) {
+        if (data->guardList[ii].data() && !data->guardList[ii].isDuplicate) {
+#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 2))
+            QMetaObject::disconnectOne(data->guardList[ii].data(), 
+                                       data->guardList[ii].notifyIndex, 
+                                       q, notifyIdx);
+#else
+            // QTBUG-6781
+            QMetaObject::disconnect(data->guardList[ii].data(), 
+                                    data->guardList[ii].notifyIndex, 
+                                    q, notifyIdx);
+#endif
+        }
+    }
+
+    if (newGuardList) {
+        if (data->guardList) delete [] data->guardList;
+        data->guardList = newGuardList;
+        data->guardListLength = properties.count();
+    }
+}
+
+/*!
+    \fn void QDeclarativeExpression::valueChanged()
+
+    Emitted each time the expression value changes from the last time it was
+    evaluated.  The expression must have been evaluated at least once (by
+    calling QDeclarativeExpression::value()) before this signal will be emitted.
+*/
+
+void QDeclarativeExpressionPrivate::emitValueChanged()
+{
+    Q_Q(QDeclarativeExpression);
+    emit q->valueChanged();
+}
+
+QDeclarativeAbstractExpression::QDeclarativeAbstractExpression()
+: m_context(0), m_prevExpression(0), m_nextExpression(0)
+{
+}
+
+QDeclarativeAbstractExpression::~QDeclarativeAbstractExpression()
+{
+    if (m_prevExpression) {
+        *m_prevExpression = m_nextExpression;
+        if (m_nextExpression) 
+            m_nextExpression->m_prevExpression = m_prevExpression;
+    }
+}
+
+QDeclarativeContext *QDeclarativeAbstractExpression::context() const
+{
+    return m_context;
+}
+
+void QDeclarativeAbstractExpression::setContext(QDeclarativeContext *context)
+{
+    if (m_prevExpression) {
+        *m_prevExpression = m_nextExpression;
+        if (m_nextExpression) 
+            m_nextExpression->m_prevExpression = m_prevExpression;
+        m_prevExpression = 0;
+        m_nextExpression = 0;
+    }
+
+    m_context = context;
+
+    if (m_context) {
+        QDeclarativeContextPrivate *cp = 
+            static_cast<QDeclarativeContextPrivate *>(QObjectPrivate::get(m_context));
+        m_nextExpression = cp->expressions;
+        if (m_nextExpression) 
+            m_nextExpression->m_prevExpression = &m_nextExpression;
+        m_prevExpression = &cp->expressions;
+        cp->expressions = this;
+    }
+}
+
+void QDeclarativeAbstractExpression::refresh()
+{
+}
+
+bool QDeclarativeAbstractExpression::isValid() const
+{
+    return m_context != 0;
+}
+
+QT_END_NAMESPACE
+