1 files changed, 570 insertions, 0 deletions
diff --git a/src/declarative/qml/qdeclarativebinding.cpp b/src/declarative/qml/qdeclarativebinding.cpp
new file mode 100644
index 0000000000..a5bd604c53
--- /dev/null
+++ b/src/declarative/qml/qdeclarativebinding.cpp
@@ -0,0 +1,570 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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/qdeclarativebinding_p.h"
+#include "private/qdeclarativebinding_p_p.h"
+
+#include "qdeclarative.h"
+#include "qdeclarativecontext.h"
+#include "qdeclarativeinfo.h"
+#include "private/qdeclarativecontext_p.h"
+#include "private/qdeclarativecompiler_p.h"
+#include "private/qdeclarativedata_p.h"
+#include "private/qdeclarativestringconverters_p.h"
+#include "private/qdeclarativestate_p_p.h"
+#include "private/qdeclarativedebugtrace_p.h"
+
+#include <QVariant>
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+QDeclarativeAbstractBinding::QDeclarativeAbstractBinding()
+: m_object(0), m_propertyIndex(-1), m_mePtr(0), m_prevBinding(0), m_nextBinding(0)
+{
+}
+
+QDeclarativeAbstractBinding::~QDeclarativeAbstractBinding()
+{
+    Q_ASSERT(m_prevBinding == 0);
+    Q_ASSERT(m_mePtr == 0);
+}
+
+/*!
+Destroy the binding.  Use this instead of calling delete.
+
+Bindings are free to implement their own memory management, so the delete operator is not 
+necessarily safe.  The default implementation clears the binding, removes it from the object
+and calls delete.
+*/
+void QDeclarativeAbstractBinding::destroy()
+{
+    removeFromObject();
+    clear();
+
+    delete this;
+}
+
+/*!
+Add this binding to \a object.
+
+This transfers ownership of the binding to the object, marks the object's property as
+being bound.  
+
+However, it does not enable the binding itself or call update() on it.
+*/
+void QDeclarativeAbstractBinding::addToObject(QObject *object, int index)
+{
+    Q_ASSERT(object);
+
+    if (m_object == object && m_propertyIndex == index)
+        return;
+
+    removeFromObject();
+
+    Q_ASSERT(!m_prevBinding);
+
+    m_object = object;
+    m_propertyIndex = index;
+
+    QDeclarativeData *data = QDeclarativeData::get(object, true);
+
+    if (index & 0xFF000000) {
+        // Value type
+
+        int coreIndex = index & 0xFFFFFF;
+
+        // Find the value type proxy (if there is one)
+        QDeclarativeValueTypeProxyBinding *proxy = 0;
+        if (data->hasBindingBit(coreIndex)) {
+            QDeclarativeAbstractBinding *b = data->bindings;
+            while (b && b->propertyIndex() != coreIndex)
+                b = b->m_nextBinding;
+            Q_ASSERT(b && b->bindingType() == QDeclarativeAbstractBinding::ValueTypeProxy);
+            proxy = static_cast<QDeclarativeValueTypeProxyBinding *>(b);
+        }
+
+        if (!proxy) {
+            proxy = new QDeclarativeValueTypeProxyBinding(object, coreIndex);
+            proxy->addToObject(object, coreIndex);
+        }
+
+        m_nextBinding = proxy->m_bindings;
+        if (m_nextBinding) m_nextBinding->m_prevBinding = &m_nextBinding;
+        m_prevBinding = &proxy->m_bindings;
+        proxy->m_bindings = this;
+
+    } else {
+        m_nextBinding = data->bindings;
+        if (m_nextBinding) m_nextBinding->m_prevBinding = &m_nextBinding;
+        m_prevBinding = &data->bindings;
+        data->bindings = this;
+
+        data->setBindingBit(m_object, index);
+    }
+}
+
+/*!
+Remove the binding from the object.
+*/
+void QDeclarativeAbstractBinding::removeFromObject()
+{
+    if (m_prevBinding) {
+        int index = propertyIndex();
+
+        *m_prevBinding = m_nextBinding;
+        if (m_nextBinding) m_nextBinding->m_prevBinding = m_prevBinding;
+        m_prevBinding = 0;
+        m_nextBinding = 0;
+
+        if (index & 0xFF000000) {
+            // Value type - we don't remove the proxy from the object.  It will sit their happily
+            // doing nothing until it is removed by a write, a binding change or it is reused
+            // to hold more sub-bindings.
+        } else if (m_object) {
+            QDeclarativeData *data = QDeclarativeData::get(m_object, false);
+            if (data) data->clearBindingBit(index);
+        }
+
+        m_object = 0;
+        m_propertyIndex = -1;
+    }
+}
+
+static void bindingDummyDeleter(QDeclarativeAbstractBinding *)
+{
+}
+
+QDeclarativeAbstractBinding::Pointer QDeclarativeAbstractBinding::weakPointer()
+{
+    if (m_selfPointer.isNull())
+        m_selfPointer = QSharedPointer<QDeclarativeAbstractBinding>(this, bindingDummyDeleter);
+
+    return m_selfPointer.toWeakRef();
+}
+
+void QDeclarativeAbstractBinding::clear()
+{
+    if (m_mePtr) {
+        *m_mePtr = 0;
+        m_mePtr = 0;
+    }
+}
+
+QString QDeclarativeAbstractBinding::expression() const
+{
+    return QLatin1String("<Unknown>");
+}
+
+QObject *QDeclarativeAbstractBinding::object() const
+{
+    return m_object;
+}
+
+int QDeclarativeAbstractBinding::propertyIndex() const
+{
+    return m_propertyIndex;
+}
+
+void QDeclarativeAbstractBinding::setEnabled(bool enabled, QDeclarativePropertyPrivate::WriteFlags flags)
+{
+    if (enabled) update(flags);
+}
+
+QDeclarativeBinding::Identifier QDeclarativeBinding::Invalid = -1;
+
+void QDeclarativeBindingPrivate::refresh()
+{
+    Q_Q(QDeclarativeBinding);
+    q->update();
+}
+
+QDeclarativeBindingPrivate::QDeclarativeBindingPrivate()
+: updating(false), enabled(false), deleted(0)
+{
+}
+
+QDeclarativeBindingPrivate::~QDeclarativeBindingPrivate()
+{
+    if (deleted) *deleted = true;
+}
+
+QDeclarativeBinding::QDeclarativeBinding(void *data, QDeclarativeRefCount *rc, QObject *obj, 
+                                         QDeclarativeContextData *ctxt, const QString &url, int lineNumber, 
+                                         QObject *parent)
+: QDeclarativeExpression(ctxt, data, rc, obj, url, lineNumber, *new QDeclarativeBindingPrivate)
+{
+    setParent(parent);
+    setNotifyOnValueChanged(true);
+}
+
+QDeclarativeBinding *
+QDeclarativeBinding::createBinding(Identifier id, QObject *obj, QDeclarativeContext *ctxt,
+                                   const QString &url, int lineNumber, QObject *parent)
+{
+    if (id < 0)
+        return 0;
+
+    QDeclarativeContextData *ctxtdata = QDeclarativeContextData::get(ctxt);
+
+    QDeclarativeEnginePrivate *engine = QDeclarativeEnginePrivate::get(qmlEngine(obj));
+    QDeclarativeCompiledData *cdata = 0;
+    QDeclarativeTypeData *typeData = 0;
+    if (engine && ctxtdata && !ctxtdata->url.isEmpty()) {
+        typeData = engine->typeLoader.get(ctxtdata->url);
+        cdata = typeData->compiledData();
+    }
+    QDeclarativeBinding *rv = cdata ? new QDeclarativeBinding((void*)cdata->datas.at(id).constData(), cdata, obj, ctxtdata, url, lineNumber, parent) : 0;
+    if (typeData)
+        typeData->release();
+    return rv;
+}
+
+QDeclarativeBinding::QDeclarativeBinding(const QString &str, QObject *obj, QDeclarativeContext *ctxt, 
+                                         QObject *parent)
+: QDeclarativeExpression(QDeclarativeContextData::get(ctxt), obj, str, *new QDeclarativeBindingPrivate)
+{
+    setParent(parent);
+    setNotifyOnValueChanged(true);
+}
+
+QDeclarativeBinding::QDeclarativeBinding(const QString &str, QObject *obj, QDeclarativeContextData *ctxt, 
+                                         QObject *parent)
+: QDeclarativeExpression(ctxt, obj, str, *new QDeclarativeBindingPrivate)
+{
+    setParent(parent);
+    setNotifyOnValueChanged(true);
+}
+
+QDeclarativeBinding::QDeclarativeBinding(const QScriptValue &func, QObject *obj, QDeclarativeContextData *ctxt, QObject *parent)
+: QDeclarativeExpression(ctxt, obj, func, *new QDeclarativeBindingPrivate)
+{
+    setParent(parent);
+    setNotifyOnValueChanged(true);
+}
+
+QDeclarativeBinding::~QDeclarativeBinding()
+{
+}
+
+void QDeclarativeBinding::setTarget(const QDeclarativeProperty &prop)
+{
+    Q_D(QDeclarativeBinding);
+    d->property = prop;
+
+    update();
+}
+
+QDeclarativeProperty QDeclarativeBinding::property() const 
+{
+   Q_D(const QDeclarativeBinding);
+   return d->property; 
+}
+
+void QDeclarativeBinding::setEvaluateFlags(EvaluateFlags flags)
+{
+    Q_D(QDeclarativeBinding);
+    d->setEvaluateFlags(QDeclarativeQtScriptExpression::EvaluateFlags(static_cast<int>(flags)));
+}
+
+QDeclarativeBinding::EvaluateFlags QDeclarativeBinding::evaluateFlags() const
+{
+    Q_D(const QDeclarativeBinding);
+    return QDeclarativeBinding::EvaluateFlags(static_cast<int>(d->evaluateFlags()));
+}
+
+
+class QDeclarativeBindingProfiler {
+public:
+    QDeclarativeBindingProfiler(QDeclarativeBinding *bind)
+    {
+        QDeclarativeDebugTrace::startRange(QDeclarativeDebugTrace::Binding);
+        QDeclarativeDebugTrace::rangeData(QDeclarativeDebugTrace::Binding, bind->expression());
+        QDeclarativeDebugTrace::rangeLocation(QDeclarativeDebugTrace::Binding, bind->sourceFile(), bind->lineNumber());
+    }
+
+    ~QDeclarativeBindingProfiler()
+    {
+        QDeclarativeDebugTrace::endRange(QDeclarativeDebugTrace::Binding);
+    }
+};
+
+void QDeclarativeBinding::update(QDeclarativePropertyPrivate::WriteFlags flags)
+{
+    Q_D(QDeclarativeBinding);
+
+    if (!d->enabled || !d->context() || !d->context()->isValid()) 
+        return;
+
+    if (!d->updating) {
+        QDeclarativeBindingProfiler prof(this);
+        d->updating = true;
+        bool wasDeleted = false;
+        d->deleted = &wasDeleted;
+
+        if (d->property.propertyType() == qMetaTypeId<QDeclarativeBinding *>()) {
+
+            int idx = d->property.index();
+            Q_ASSERT(idx != -1);
+
+            QDeclarativeBinding *t = this;
+            int status = -1;
+            void *a[] = { &t, 0, &status, &flags };
+            QMetaObject::metacall(d->property.object(),
+                                  QMetaObject::WriteProperty,
+                                  idx, a);
+
+            if (wasDeleted)
+                return;
+
+        } else {
+            QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(d->context()->engine);
+
+            bool isUndefined = false;
+            QVariant value;
+
+            QScriptValue scriptValue = d->scriptValue(0, &isUndefined);
+            if (wasDeleted)
+                return;
+
+            if (d->property.propertyTypeCategory() == QDeclarativeProperty::List) {
+                value = ep->scriptValueToVariant(scriptValue, qMetaTypeId<QList<QObject *> >());
+            } else if (scriptValue.isNull() && 
+                       d->property.propertyTypeCategory() == QDeclarativeProperty::Object) {
+                value = QVariant::fromValue((QObject *)0);
+            } else {
+                value = ep->scriptValueToVariant(scriptValue, d->property.propertyType());
+                if (value.userType() == QMetaType::QObjectStar && !qvariant_cast<QObject*>(value)) {
+                    // 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
+                    int type = ep->objectClass->objectType(scriptValue);
+                    QObject *o = 0;
+                    value = QVariant(type, (void *)&o);
+                }
+            }
+
+
+            if (d->error.isValid()) {
+
+            } else if (isUndefined && d->property.isResettable()) {
+
+                d->property.reset();
+
+            } else if (isUndefined && d->property.propertyType() == qMetaTypeId<QVariant>()) {
+
+                QDeclarativePropertyPrivate::write(d->property, QVariant(), flags);
+
+            } else if (isUndefined) {
+
+                QUrl url = QUrl(d->url);
+                int line = d->line;
+                if (url.isEmpty()) url = QUrl(QLatin1String("<Unknown File>"));
+
+                d->error.setUrl(url);
+                d->error.setLine(line);
+                d->error.setColumn(-1);
+                d->error.setDescription(QLatin1String("Unable to assign [undefined] to ") +
+                                        QLatin1String(QMetaType::typeName(d->property.propertyType())) +
+                                        QLatin1String(" ") + d->property.name());
+
+            } else if (!scriptValue.isRegExp() && scriptValue.isFunction()) {
+
+                QUrl url = QUrl(d->url);
+                int line = d->line;
+                if (url.isEmpty()) url = QUrl(QLatin1String("<Unknown File>"));
+
+                d->error.setUrl(url);
+                d->error.setLine(line);
+                d->error.setColumn(-1);
+                d->error.setDescription(QLatin1String("Unable to assign a function to a property."));
+
+            } else if (d->property.object() &&
+                       !QDeclarativePropertyPrivate::write(d->property, value, flags)) {
+
+                if (wasDeleted)
+                    return;
+
+                QUrl url = QUrl(d->url);
+                int line = d->line;
+                if (url.isEmpty()) url = QUrl(QLatin1String("<Unknown File>"));
+
+                const char *valueType = 0;
+                if (value.userType() == QVariant::Invalid) valueType = "null";
+                else valueType = QMetaType::typeName(value.userType());
+
+                d->error.setUrl(url);
+                d->error.setLine(line);
+                d->error.setColumn(-1);
+                d->error.setDescription(QLatin1String("Unable to assign ") +
+                                        QLatin1String(valueType) +
+                                        QLatin1String(" to ") +
+                                        QLatin1String(QMetaType::typeName(d->property.propertyType())));
+            }
+
+            if (wasDeleted)
+                return;
+
+            if (d->error.isValid()) {
+               if (!d->addError(ep)) ep->warning(this->error());
+            } else {
+                d->removeError();
+            }
+        }
+
+        d->updating = false;
+        d->deleted = 0;
+    } else {
+        qmlInfo(d->property.object()) << tr("Binding loop detected for property \"%1\"").arg(d->property.name());
+    }
+}
+
+void QDeclarativeBindingPrivate::emitValueChanged()
+{
+    Q_Q(QDeclarativeBinding);
+    q->update();
+}
+
+void QDeclarativeBinding::setEnabled(bool e, QDeclarativePropertyPrivate::WriteFlags flags)
+{
+    Q_D(QDeclarativeBinding);
+    d->enabled = e;
+    setNotifyOnValueChanged(e);
+
+    if (e) 
+        update(flags);
+}
+
+bool QDeclarativeBinding::enabled() const
+{
+    Q_D(const QDeclarativeBinding);
+
+    return d->enabled;
+}
+
+QString QDeclarativeBinding::expression() const
+{
+    return QDeclarativeExpression::expression();
+}
+
+QDeclarativeValueTypeProxyBinding::QDeclarativeValueTypeProxyBinding(QObject *o, int index)
+: m_object(o), m_index(index), m_bindings(0)
+{
+}
+
+QDeclarativeValueTypeProxyBinding::~QDeclarativeValueTypeProxyBinding()
+{
+    while (m_bindings) {
+        QDeclarativeAbstractBinding *binding = m_bindings;
+        binding->setEnabled(false, 0);
+        binding->destroy();
+    }
+}
+
+void QDeclarativeValueTypeProxyBinding::setEnabled(bool e, QDeclarativePropertyPrivate::WriteFlags flags)
+{
+    if (e) {
+        QDeclarativeAbstractBinding *bindings = m_bindings;
+        recursiveEnable(bindings, flags);
+    } else {
+        QDeclarativeAbstractBinding *bindings = m_bindings;
+        recursiveDisable(bindings);
+    }
+}
+
+void QDeclarativeValueTypeProxyBinding::recursiveEnable(QDeclarativeAbstractBinding *b, QDeclarativePropertyPrivate::WriteFlags flags)
+{
+    if (!b)
+        return;
+
+    recursiveEnable(b->m_nextBinding, flags);
+
+    if (b)
+        b->setEnabled(true, flags);
+}
+
+void QDeclarativeValueTypeProxyBinding::recursiveDisable(QDeclarativeAbstractBinding *b)
+{
+    if (!b)
+        return;
+
+    recursiveDisable(b->m_nextBinding);
+
+    if (b)
+        b->setEnabled(false, 0);
+}
+
+void QDeclarativeValueTypeProxyBinding::update(QDeclarativePropertyPrivate::WriteFlags)
+{
+}
+
+QDeclarativeAbstractBinding *QDeclarativeValueTypeProxyBinding::binding(int propertyIndex)
+{
+    QDeclarativeAbstractBinding *binding = m_bindings;
+    
+    while (binding && binding->propertyIndex() != propertyIndex) 
+        binding = binding->m_nextBinding;
+
+    return binding;
+}
+
+/*!
+Removes a collection of bindings, corresponding to the set bits in \a mask.
+*/
+void QDeclarativeValueTypeProxyBinding::removeBindings(quint32 mask)
+{
+    QDeclarativeAbstractBinding *binding = m_bindings;
+    while (binding) {
+        if (mask & (1 << (binding->propertyIndex() >> 24))) {
+            QDeclarativeAbstractBinding *remove = binding;
+            binding = remove->m_nextBinding;
+            *remove->m_prevBinding = remove->m_nextBinding;
+            if (remove->m_nextBinding) remove->m_nextBinding->m_prevBinding = remove->m_prevBinding;
+            remove->m_prevBinding = 0;
+            remove->m_nextBinding = 0;
+            remove->destroy();
+        } else {
+            binding = binding->m_nextBinding;
+        }
+    }
+}
+
+QT_END_NAMESPACE