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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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.LGPLv3 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.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 later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickdeferredexecute_p_p.h"
#include <QtCore/qhash.h>
#include <QtQml/qqmlengine.h>
#include <QtQml/private/qqmldata_p.h>
#include <QtQml/private/qqmlcomponent_p.h>
#include <QtQml/private/qqmlobjectcreator_p.h>
QT_BEGIN_NAMESPACE
namespace QtQuickPrivate {
typedef QHash<uint, QQmlComponentPrivate::DeferredState *> DeferredStates;
static inline uint qHash(QObject *object, const QString &propertyName)
{
return ::qHash(object) + ::qHash(propertyName);
}
Q_GLOBAL_STATIC(DeferredStates, deferredStates)
static void cancelDeferred(QQmlData *ddata, int propertyIndex)
{
auto dit = ddata->deferredData.rbegin();
while (dit != ddata->deferredData.rend()) {
(*dit)->bindings.remove(propertyIndex);
++dit;
}
}
static bool beginDeferred(QQmlEnginePrivate *enginePriv, const QQmlProperty &property, QQmlComponentPrivate::DeferredState *deferredState)
{
QObject *object = property.object();
QQmlData *ddata = QQmlData::get(object);
Q_ASSERT(!ddata->deferredData.isEmpty());
int propertyIndex = property.index();
int wasInProgress = enginePriv->inProgressCreations;
for (auto dit = ddata->deferredData.rbegin(); dit != ddata->deferredData.rend(); ++dit) {
QQmlData::DeferredData *deferData = *dit;
auto bindings = deferData->bindings;
auto range = bindings.equal_range(propertyIndex);
if (range.first == bindings.end())
continue;
QQmlComponentPrivate::ConstructionState *state = new QQmlComponentPrivate::ConstructionState;
state->completePending = true;
QQmlContextData *creationContext = nullptr;
state->creator.reset(new QQmlObjectCreator(deferData->context->parent, deferData->compilationUnit, creationContext));
enginePriv->inProgressCreations++;
typedef QMultiHash<int, const QV4::CompiledData::Binding *> QV4PropertyBindingHash;
auto it = std::reverse_iterator<QV4PropertyBindingHash::iterator>(range.second);
auto last = std::reverse_iterator<QV4PropertyBindingHash::iterator>(range.first);
#if Q_QML_PRIVATE_API_VERSION < 7
while (it != last) {
if (!state->creator->populateDeferredBinding(property, deferData, *it))
state->errors << state->creator->errors;
++it;
}
#else
state->creator->beginPopulateDeferred(deferData->context);
while (it != last) {
state->creator->populateDeferredBinding(property, deferData->deferredIdx, *it);
++it;
}
state->creator->finalizePopulateDeferred();
state->errors << state->creator->errors;
#endif
deferredState->constructionStates += state;
// Cleanup any remaining deferred bindings for this property, also in inner contexts,
// to avoid executing them later and overriding the property that was just populated.
cancelDeferred(ddata, propertyIndex);
break;
}
return enginePriv->inProgressCreations > wasInProgress;
}
void beginDeferred(QObject *object, const QString &property)
{
QQmlData *data = QQmlData::get(object);
if (data && !data->deferredData.isEmpty() && !data->wasDeleted(object)) {
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(data->context->engine);
QQmlComponentPrivate::DeferredState *state = new QQmlComponentPrivate::DeferredState;
if (beginDeferred(ep, QQmlProperty(object, property), state))
deferredStates()->insert(qHash(object, property), state);
else
delete state;
// Release deferred data for those compilation units that no longer have deferred bindings
data->releaseDeferredData();
}
}
void cancelDeferred(QObject *object, const QString &property)
{
QQmlData *data = QQmlData::get(object);
if (data)
cancelDeferred(data, QQmlProperty(object, property).index());
}
void completeDeferred(QObject *object, const QString &property)
{
QQmlData *data = QQmlData::get(object);
QQmlComponentPrivate::DeferredState *state = deferredStates()->take(qHash(object, property));
if (data && state && !data->wasDeleted(object)) {
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(data->context->engine);
QQmlComponentPrivate::completeDeferred(ep, state);
}
delete state;
}
} // QtQuickPrivate
QT_END_NAMESPACE
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