/****************************************************************************
**
** 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.
**
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** $QT_END_LICENSE$
**
****************************************************************************/
#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/qdeclarativedata_p.h"
#include "private/qdeclarativestringconverters_p.h"
#include <QVariant>
#include <QtCore/qdebug.h>
QT_BEGIN_NAMESPACE
QDeclarativeBindingData::QDeclarativeBindingData()
: updating(false), enabled(false)
{
}
QDeclarativeBindingData::~QDeclarativeBindingData()
{
removeError();
}
void QDeclarativeBindingData::refresh()
{
if (enabled && !updating && q) {
QDeclarativeBinding *b = static_cast<QDeclarativeBinding *>(QDeclarativeExpressionPrivate::get(q));
b->update();
}
}
QDeclarativeBindingPrivate::QDeclarativeBindingPrivate()
: QDeclarativeExpressionPrivate(new QDeclarativeBindingData)
{
}
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(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()
{
}
void QDeclarativeBinding::setTarget(const QDeclarativeProperty &prop)
{
Q_D(QDeclarativeBinding);
d->bindingData()->property = prop;
update();
}
QDeclarativeProperty QDeclarativeBinding::property() const
{
Q_D(const QDeclarativeBinding);
return d->bindingData()->property;
}
void QDeclarativeBinding::update(QDeclarativePropertyPrivate::WriteFlags flags)
{
Q_D(QDeclarativeBinding);
QDeclarativeBindingData *data = d->bindingData();
if (!data->enabled || !data->context() || !data->context()->isValid())
return;
data->addref();
if (!data->updating) {
data->updating = true;
if (data->property.propertyType() == qMetaTypeId<QDeclarativeBinding *>()) {
int idx = data->property.index();
Q_ASSERT(idx != -1);
QDeclarativeBinding *t = this;
int status = -1;
void *a[] = { &t, 0, &status, &flags };
QMetaObject::metacall(data->property.object(),
QMetaObject::WriteProperty,
idx, a);
} else {
QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(data->context()->engine);
bool isUndefined = false;
QVariant value;
QScriptValue scriptValue = d->scriptValue(0, &isUndefined);
if (data->property.propertyTypeCategory() == QDeclarativeProperty::List) {
value = ep->scriptValueToVariant(scriptValue, qMetaTypeId<QList<QObject *> >());
} else if (scriptValue.isNull() &&
data->property.propertyTypeCategory() == QDeclarativeProperty::Object) {
value = QVariant::fromValue((QObject *)0);
} else {
value = ep->scriptValueToVariant(scriptValue, data->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 (data->error.isValid()) {
} else if (isUndefined && data->property.isResettable()) {
data->property.reset();
} else if (isUndefined && data->property.propertyType() == qMetaTypeId<QVariant>()) {
QDeclarativePropertyPrivate::write(data->property, QVariant(), flags);
} else if (isUndefined) {
QUrl url = QUrl(data->url);
int line = data->line;
if (url.isEmpty()) url = QUrl(QLatin1String("<Unknown File>"));
data->error.setUrl(url);
data->error.setLine(line);
data->error.setColumn(-1);
data->error.setDescription(QLatin1String("Unable to assign [undefined] to ")
+ QLatin1String(QMetaType::typeName(data->property.propertyType()))
+ QLatin1String(" ") + data->property.name());
} else if (!scriptValue.isRegExp() && scriptValue.isFunction()) {
QUrl url = QUrl(data->url);
int line = data->line;
if (url.isEmpty()) url = QUrl(QLatin1String("<Unknown File>"));
data->error.setUrl(url);
data->error.setLine(line);
data->error.setColumn(-1);
data->error.setDescription(QLatin1String("Unable to assign a function to a property."));
} else if (data->property.object() &&
!QDeclarativePropertyPrivate::write(data->property, value, flags)) {
QUrl url = QUrl(data->url);
int line = data->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());
data->error.setUrl(url);
data->error.setLine(line);
data->error.setColumn(-1);
data->error.setDescription(QLatin1String("Unable to assign ") +
QLatin1String(valueType) +
QLatin1String(" to ") +
QLatin1String(QMetaType::typeName(data->property.propertyType())));
}
if (data->error.isValid()) {
if (!data->addError(ep)) ep->warning(this->error());
} else {
data->removeError();
}
}
data->updating = false;
} else {
qmlInfo(data->property.object()) << tr("Binding loop detected for property \"%1\"").arg(data->property.name());
}
data->release();
}
void QDeclarativeBindingPrivate::emitValueChanged()
{
Q_Q(QDeclarativeBinding);
q->update();
}
void QDeclarativeBinding::setEnabled(bool e, QDeclarativePropertyPrivate::WriteFlags flags)
{
Q_D(QDeclarativeBinding);
d->bindingData()->enabled = e;
setNotifyOnValueChanged(e);
QDeclarativeAbstractBinding::setEnabled(e, flags);
if (e) {
addToObject(d->bindingData()->property.object());
update(flags);
} else {
removeFromObject();
}
}
int QDeclarativeBinding::propertyIndex()
{
Q_D(QDeclarativeBinding);
return QDeclarativePropertyPrivate::bindingIndex(d->bindingData()->property);
}
bool QDeclarativeBinding::enabled() const
{
Q_D(const QDeclarativeBinding);
return d->bindingData()->enabled;
}
QString QDeclarativeBinding::expression() const
{
return QDeclarativeExpression::expression();
}
QDeclarativeAbstractBinding::QDeclarativeAbstractBinding()
: m_object(0), m_mePtr(0), m_prevBinding(0), m_nextBinding(0)
{
}
QDeclarativeAbstractBinding::~QDeclarativeAbstractBinding()
{
Q_ASSERT(m_prevBinding == 0);
Q_ASSERT(m_mePtr == 0);
}
void QDeclarativeAbstractBinding::destroy()
{
removeFromObject();
clear();
delete this;
}
void QDeclarativeAbstractBinding::addToObject(QObject *object)
{
Q_ASSERT(object);
if (m_object == object)
return;
int index = propertyIndex();
removeFromObject();
Q_ASSERT(!m_prevBinding);
m_object = object;
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);
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);
}
}
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 for ever more.
} else if (m_object) {
QDeclarativeData *data = QDeclarativeData::get(m_object, false);
if (data) data->clearBindingBit(index);
}
m_object = 0;
}
}
void QDeclarativeAbstractBinding::clear()
{
if (m_mePtr) {
*m_mePtr = 0;
m_mePtr = 0;
}
}
QString QDeclarativeAbstractBinding::expression() const
{
return QLatin1String("<Unknown>");
}
void QDeclarativeAbstractBinding::setEnabled(bool e, QDeclarativePropertyPrivate::WriteFlags)
{
if (e) m_mePtr = 0;
}
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) {
addToObject(m_object);
QDeclarativeAbstractBinding *bindings = m_bindings;
m_bindings = 0;
recursiveEnable(bindings, flags);
} else {
removeFromObject();
QDeclarativeAbstractBinding *bindings = m_bindings;
m_bindings = 0;
recursiveDisable(bindings);
}
}
void QDeclarativeValueTypeProxyBinding::recursiveEnable(QDeclarativeAbstractBinding *b, QDeclarativePropertyPrivate::WriteFlags flags)
{
if (!b)
return;
QDeclarativeAbstractBinding *next = b->m_nextBinding;
b->m_prevBinding = 0;
b->m_nextBinding = 0;
Q_ASSERT(b->m_mePtr == 0);
b->m_mePtr = &b;
recursiveEnable(next, flags);
if (b)
b->setEnabled(true, flags);
}
void QDeclarativeValueTypeProxyBinding::recursiveDisable(QDeclarativeAbstractBinding *b)
{
if (!b)
return;
recursiveDisable(b->m_nextBinding);
b->setEnabled(false, 0);
Q_ASSERT(b->m_prevBinding == 0);
Q_ASSERT(b->m_nextBinding == 0);
b->m_nextBinding = m_bindings;
if (b->m_nextBinding) b->m_nextBinding->m_prevBinding = &b->m_nextBinding;
b->m_prevBinding = &m_bindings;
m_bindings = b;
}
int QDeclarativeValueTypeProxyBinding::propertyIndex()
{
return m_index;
}
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;
}
QT_END_NAMESPACE