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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qqmlpropertybinding_p.h"
#include <private/qpropertybinding_p.h>
QT_BEGIN_NAMESPACE
QUntypedPropertyBinding QQmlPropertyBinding::create(const QQmlPropertyData *pd, QV4::Function *function,
QObject *obj, const QQmlRefPointer<QQmlContextData> &ctxt,
QV4::ExecutionContext *scope)
{
auto binding = new QQmlPropertyBinding(QMetaType(pd->propType()));
binding->setNotifyOnValueChanged(true);
binding->setContext(ctxt);
binding->setScopeObject(obj);
binding->setupFunction(scope, function);
return QUntypedPropertyBinding(QPropertyBindingPrivatePtr(binding));
}
void QQmlPropertyBinding::expressionChanged()
{
markDirtyAndNotifyObservers();
}
QQmlPropertyBinding::QQmlPropertyBinding(const QMetaType &mt)
: QPropertyBindingPrivate(mt,
[this](const QMetaType &metaType, void *dataPtr) -> QUntypedPropertyBinding::BindingEvaluationResult {
return evaluateAndReturnTrueIfChanged(metaType, dataPtr);
}, QPropertyBindingSourceLocation())
{
}
QUntypedPropertyBinding::BindingEvaluationResult QQmlPropertyBinding::evaluateAndReturnTrueIfChanged(const QMetaType &metaType, void *dataPtr)
{
QQmlEngine *engine = context()->engine();
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(engine);
ep->referenceScarceResources();
bool isUndefined = false;
QV4::Scope scope(engine->handle());
QV4::ScopedValue result(scope, QQmlJavaScriptExpression::evaluate(&isUndefined));
ep->dereferenceScarceResources();
if (hasError()) {
QPropertyBindingError error(QPropertyBindingError::UnknownError);
error.setDescription(delayedError()->error().description());
return error;
}
QVariant resultVariant(scope.engine->toVariant(result, metaType.id()));
int compareResult = 0;
if (QMetaType::compare(dataPtr, resultVariant.constData(), metaType.id(), &compareResult)
&& compareResult == 0)
return false;
QMetaType::destruct(metaType.id(), dataPtr);
QMetaType::construct(metaType.id(), dataPtr, resultVariant.constData());
return true;
}
QUntypedPropertyBinding QQmlTranslationPropertyBinding::create(const QQmlPropertyData *pd, const QQmlRefPointer<QV4::ExecutableCompilationUnit> &compilationUnit, const QV4::CompiledData::Binding *binding)
{
auto translationBinding = [compilationUnit, binding](const QMetaType &metaType, void *dataPtr) {
// Create a dependency to the uiLanguage
QJSEnginePrivate::get(compilationUnit->engine)->uiLanguage.value();
QVariant resultVariant(compilationUnit->bindingValueAsString(binding));
if (metaType.id() != QMetaType::QString)
resultVariant.convert(metaType.id());
int compareResult = 0;
if (QMetaType::compare(dataPtr, resultVariant.constData(), metaType.id(), &compareResult)
&& compareResult == 0)
return false;
QMetaType::destruct(metaType.id(), dataPtr);
QMetaType::construct(metaType.id(), dataPtr, resultVariant.constData());
return true;
};
return QUntypedPropertyBinding(QMetaType(pd->propType()), translationBinding, QPropertyBindingSourceLocation());
}
QT_END_NAMESPACE
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