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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qmlbindingoptimizations_p.h"
#include <private/qmlcontext_p.h>
QT_BEGIN_NAMESPACE
/*
The QmlBinding_Id optimization handles expressions of the type:
property: id
where id is a local context id, and property is an object property.
Coercian between id and property must be checked outside the QmlBinding_Id -
it assumes that they coerce successfully.
The QmlBinding_Id class avoids any signal slot connections, through the
special "bindings" linked list maintained in the
QmlContextPrivate::ContextGuard instance for each id object.
*/
QmlBinding_Id::QmlBinding_Id(QObject *object, int propertyIdx,
QmlContext *context, int id)
: m_prev(0), m_next(0), m_object(object), m_propertyIdx(propertyIdx), m_id(id)
{
QmlAbstractExpression::setContext(context);
}
QmlBinding_Id::~QmlBinding_Id()
{
removeFromContext();
}
void QmlBinding_Id::setEnabled(bool e)
{
if (e) {
addToObject(m_object);
update();
} else {
removeFromObject();
}
QmlAbstractBinding::setEnabled(e);
}
int QmlBinding_Id::propertyIndex()
{
return m_propertyIdx;
}
void QmlBinding_Id::update()
{
QmlContextPrivate *ctxtPriv =
static_cast<QmlContextPrivate *>(QObjectPrivate::get(context()));
if (ctxtPriv) {
if (!m_prev) {
m_next = ctxtPriv->idValues[m_id].bindings;
if (m_next) m_next->m_prev = &m_next;
m_prev = &ctxtPriv->idValues[m_id].bindings;
ctxtPriv->idValues[m_id].bindings = this;
}
QObject *o = ctxtPriv->idValues[m_id].data();
void *a[] = { &o, 0 };
QMetaObject::metacall(m_object, QMetaObject::WriteProperty,
m_propertyIdx, a);
}
}
void QmlBinding_Id::removeFromContext()
{
if (m_prev) {
*m_prev = m_next;
if (m_next) m_next->m_prev = m_prev;
m_next = 0;
m_prev = 0;
}
}
void QmlBinding_Id::reset()
{
removeFromContext();
QObject *o = 0;
void *a[] = { &o, 0 };
QMetaObject::metacall(m_object, QMetaObject::WriteProperty,
m_propertyIdx, a);
}
/*
The QmlBinding_ObjectProperty optimization handles expressions of the type:
property: objectProperty
where both property and objectProperty are object properties on the target
object. Coercian between the two must be checked outside the
QmlBinding_ObjectProperty - it assumes that they coerce successfully.
Due to dot properties, property does not have to be on the same object as
objectProperty. For example:
anchors.fill: parent
*/
QmlBinding_ObjProperty::QmlBinding_ObjProperty(QObject *object, int propertyIdx,
QObject *context, int contextIdx,
int notifyIdx)
: m_enabled(false), m_object(object), m_propertyIdx(propertyIdx),
m_context(context), m_contextIdx(contextIdx), m_notifyIdx(notifyIdx)
{
}
void QmlBinding_ObjProperty::setEnabled(bool e)
{
m_enabled = e;
if (e) {
addToObject(m_object);
update();
} else {
removeFromObject();
}
QmlAbstractBinding::setEnabled(e);
}
int QmlBinding_ObjProperty::propertyIndex()
{
return m_propertyIdx;
}
void QmlBinding_ObjProperty::update()
{
if (!m_enabled)
return;
QObject *value = 0;
void *a[] = { &value, 0 };
// Read
QMetaObject::metacall(m_context, QMetaObject::ReadProperty,
m_contextIdx, a);
// Write
QMetaObject::metacall(m_object, QMetaObject::WriteProperty,
m_propertyIdx, a);
// Connect notify if needed. Only need to connect once, so we set
// m_notifyIdx back to -1 afterwards
static int slotIdx = -1;
if (m_notifyIdx != -1) {
if (slotIdx == -1)
slotIdx = QmlBinding_ObjProperty::staticMetaObject.indexOfMethod("update()");
QMetaObject::connect(m_context, m_notifyIdx, this, slotIdx);
m_notifyIdx = -1;
}
}
QT_END_NAMESPACE
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