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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 <qqmlinfo.h>
QT_BEGIN_NAMESPACE
QUntypedPropertyBinding QQmlPropertyBinding::create(const QQmlPropertyData *pd, QV4::Function *function,
QObject *obj, const QQmlRefPointer<QQmlContextData> &ctxt,
QV4::ExecutionContext *scope)
{
if (auto aotFunction = function->aotFunction; aotFunction && aotFunction->returnType.id() == pd->propType()) {
return QUntypedPropertyBinding(aotFunction->returnType,
[
aotFunction,
unit = QQmlRefPointer<QV4::ExecutableCompilationUnit>(function->executableCompilationUnit()),
scopeObject = QPointer<QObject>(obj),
context = ctxt
](const QMetaType &, void *dataPtr) -> bool {
Q_UNUSED(unit); // to keep refcount
aotFunction->functionPtr(context->asQQmlContext(), scopeObject.data(), dataPtr);
// ### Fixme: The aotFunction should do the check whether old and new value are the same and
// return false in that case
return true;
},
QPropertyBindingSourceLocation());
}
auto buffer = new std::byte[sizeof(QQmlPropertyBinding)]; // QQmlPropertyBinding uses delete[]
auto binding = new (buffer) QQmlPropertyBinding(QMetaType(pd->propType()));
binding->setNotifyOnValueChanged(true);
binding->setContext(ctxt);
binding->setScopeObject(obj);
binding->setupFunction(scope, function);
return QUntypedPropertyBinding(static_cast<QPropertyBindingPrivate *>(QPropertyBindingPrivatePtr(binding).data()));
}
void QQmlPropertyBinding::expressionChanged()
{
const auto currentTag = m_error.tag();
if (currentTag & InEvaluationLoop) {
QQmlError err;
auto location = QQmlJavaScriptExpression::sourceLocation();
err.setUrl(QUrl{location.sourceFile});
err.setLine(location.line);
err.setColumn(location.column);
err.setDescription(QString::fromLatin1("Binding loop detected"));
qmlWarning(this->scopeObject(), err);
return;
}
m_error.setTag(currentTag | InEvaluationLoop);
markDirtyAndNotifyObservers();
m_error.setTag(currentTag);
}
QQmlPropertyBinding::QQmlPropertyBinding(QMetaType mt)
: QPropertyBindingPrivate(mt,
&QtPrivate::bindingFunctionVTable<QQmlPropertyBinding>,
QPropertyBindingSourceLocation())
{
}
bool QQmlPropertyBinding::evaluate(QMetaType metaType, void *dataPtr)
{
const auto ctxt = context();
QQmlEngine *engine = ctxt ? ctxt->engine() : nullptr;
if (!engine) {
QPropertyBindingError error(QPropertyBindingError::EvaluationError);
QPropertyBindingPrivate::currentlyEvaluatingBinding()->setError(std::move(error));
return false;
}
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, delayedError()->error().description());
QPropertyBindingPrivate::currentlyEvaluatingBinding()->setError(std::move(error));
return false;
}
QVariant resultVariant(scope.engine->toVariant(result, metaType.id()));
resultVariant.convert(metaType);
const bool hasChanged = !metaType.equals(resultVariant.constData(), dataPtr);
metaType.destruct(dataPtr);
metaType.construct(dataPtr, resultVariant.constData());
return hasChanged;
}
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) -> bool {
// 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);
const bool hasChanged = !metaType.equals(resultVariant.constData(), dataPtr);
metaType.destruct(dataPtr);
metaType.construct(dataPtr, resultVariant.constData());
return hasChanged;
};
return QUntypedPropertyBinding(QMetaType(pd->propType()), translationBinding, QPropertyBindingSourceLocation());
}
QT_END_NAMESPACE
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