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Diffstat (limited to 'src/declarative/qml/qmlbinding.cpp')
| -rw-r--r-- | src/declarative/qml/qmlbinding.cpp | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/declarative/qml/qmlbinding.cpp b/src/declarative/qml/qmlbinding.cpp new file mode 100644 index 0000000..45d20f4 --- /dev/null +++ b/src/declarative/qml/qmlbinding.cpp @@ -0,0 +1,225 @@ +/**************************************************************************** +** +** 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 <qml.h> +#include "qmlbinding.h" +#include "qmlbinding_p.h" +#include <qmlcontext.h> +#include <qmlinfo.h> +#include <QVariant> +#include <private/qfxperf_p.h> +#include <QtCore/qdebug.h> +#include <private/qmlcontext_p.h> +#include <private/qmldeclarativedata_p.h> + +Q_DECLARE_METATYPE(QList<QObject *>); + +QT_BEGIN_NAMESPACE + +QML_DEFINE_NOCREATE_TYPE(QmlBinding); + +QmlBindingPrivate::QmlBindingPrivate() +: updating(false), enabled(false) +{ +} + +QmlBinding::QmlBinding(void *data, QmlRefCount *rc, QObject *obj, QmlContext *ctxt, QObject *parent) +: QmlExpression(ctxt, data, rc, obj, *new QmlBindingPrivate) +{ + setParent(parent); +} + +QmlBinding::QmlBinding(const QString &str, QObject *obj, QmlContext *ctxt, QObject *parent) +: QmlExpression(ctxt, str, obj, *new QmlBindingPrivate) +{ + setParent(parent); +} + +QmlBinding::~QmlBinding() +{ +} + +void QmlBinding::setTarget(const QmlMetaProperty &prop) +{ + Q_D(QmlBinding); + d->property = prop; + + update(); +} + +QmlMetaProperty QmlBinding::property() const +{ + Q_D(const QmlBinding); + return d->property; +} + +void QmlBinding::update() +{ + Q_D(QmlBinding); + +#ifdef Q_ENABLE_PERFORMANCE_LOG + QFxPerfTimer<QFxPerf::BindableValueUpdate> bu; +#endif + if (!d->enabled) + return; + + if (!d->updating) { + d->updating = true; + + if (d->property.propertyCategory() == QmlMetaProperty::Bindable) { + + int idx = d->property.coreIndex(); + Q_ASSERT(idx != -1); + + void *a[1]; + QmlBinding *t = this; + a[0] = (void *)&t; + QMetaObject::metacall(d->property.object(), + QMetaObject::WriteProperty, + idx, a); + + } else { + + QVariant value = this->value(); + if (value.type() == QVariant::String) { + QmlMetaType::StringConverter con = QmlMetaType::customStringConverter(d->property.propertyType()); + if (con) + value = con(value.toString()); + } + + if (d->property.propertyType() == QVariant::Url && + (value.type() == QVariant::String || value.type() == QVariant::ByteArray) && !value.isNull()) + value.setValue(context()->resolvedUrl(QUrl(value.toString()))); + + d->property.write(value); + } + + d->updating = false; + } else { + qmlInfo(d->property.object()) << "Binding loop detected for property" << d->property.name(); + } +} + +void QmlBinding::valueChanged() +{ + update(); +} + +void QmlBinding::setEnabled(bool e) +{ + Q_D(QmlBinding); + d->enabled = e; + setTrackChange(e); + + if (e) { + addToObject(d->property.object()); + update(); + } else { + removeFromObject(); + } + + QmlAbstractBinding::setEnabled(e); +} + +int QmlBinding::propertyIndex() +{ + Q_D(QmlBinding); + return d->property.coreIndex(); +} + +bool QmlBinding::enabled() const +{ + Q_D(const QmlBinding); + + return d->enabled; +} + +QString QmlBinding::expression() const +{ + return QmlExpression::expression(); +} + +QmlAbstractBinding::QmlAbstractBinding() +: m_mePtr(0), m_prevBinding(0), m_nextBinding(0) +{ +} + +QmlAbstractBinding::~QmlAbstractBinding() +{ + removeFromObject(); + if (m_mePtr) + *m_mePtr = 0; +} + +void QmlAbstractBinding::addToObject(QObject *object) +{ + removeFromObject(); + + if (object) { + QmlDeclarativeData *data = QmlDeclarativeData::get(object, true); + m_nextBinding = data->bindings; + if (m_nextBinding) m_nextBinding->m_prevBinding = &m_nextBinding; + m_prevBinding = &data->bindings; + data->bindings = this; + } +} + +void QmlAbstractBinding::removeFromObject() +{ + if (m_prevBinding) { + *m_prevBinding = m_nextBinding; + if (m_nextBinding) m_nextBinding->m_prevBinding = m_prevBinding; + m_prevBinding = 0; + m_nextBinding = 0; + } +} + +QString QmlAbstractBinding::expression() const +{ + return QLatin1String("<Unknown>"); +} + +void QmlAbstractBinding::setEnabled(bool e) +{ + if (e) m_mePtr = 0; +} + +QT_END_NAMESPACE |