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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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>
#include <deque>
QT_BEGIN_NAMESPACE
namespace QtQuickPrivate {
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());
if (!ddata->propertyCache)
ddata->propertyCache = QQmlMetaType::propertyCache(object->metaObject());
int propertyIndex = property.index();
int wasInProgress = enginePriv->inProgressCreations;
/* we don't want deferred properties to suddenly depend on arbitrary
other properties which might have trigerred the construction of
objects as a consequence of a read.
*/
auto bindingStatus = QtPrivate::suspendCurrentBindingStatus();
auto cleanup = qScopeGuard([&](){
QtPrivate::restoreBindingStatus(bindingStatus);
});
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;
state.setCompletePending(true);
QQmlContextData *creationContext = nullptr;
state.initCreator(deferData->context->parent(), deferData->compilationUnit, creationContext);
enginePriv->inProgressCreations++;
std::deque<const QV4::CompiledData::Binding *> reversedBindings;
std::copy(range.first, range.second, std::front_inserter(reversedBindings));
state.creator()->beginPopulateDeferred(deferData->context);
for (const QV4::CompiledData::Binding *binding : reversedBindings)
state.creator()->populateDeferredBinding(property, deferData->deferredIdx, binding);
state.creator()->finalizePopulateDeferred();
state.appendCreatorErrors();
deferredState->push_back(std::move(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,
QQuickUntypedDeferredPointer *delegate, bool isOwnState)
{
QQmlData *data = QQmlData::get(object);
if (data && !data->deferredData.isEmpty() && !data->wasDeleted(object) && data->context) {
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(data->context->engine());
QQmlComponentPrivate::DeferredState state;
if (beginDeferred(ep, QQmlProperty(object, property), &state)) {
if (QQmlComponentPrivate::DeferredState *delegateState = delegate->deferredState())
delegateState->swap(state);
} else if (isOwnState) {
delegate->clearDeferredState();
}
// Release deferred data for those compilation units that no longer have deferred bindings
data->releaseDeferredData();
} else if (isOwnState) {
delegate->clearDeferredState();
}
}
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, QQuickUntypedDeferredPointer *delegate)
{
Q_UNUSED(property);
QQmlComponentPrivate::DeferredState *state = delegate->deferredState();
if (!state)
return;
QQmlData *data = QQmlData::get(object);
if (data && !data->wasDeleted(object)) {
/* we don't want deferred properties to suddenly depend on arbitrary
other properties which might have trigerred the construction of
objects as a consequence of a read.
*/
auto bindingStatus = QtPrivate::suspendCurrentBindingStatus();
auto cleanup = qScopeGuard([&](){
QtPrivate::restoreBindingStatus(bindingStatus);
});
QQmlComponentPrivate::DeferredState localState = std::move(*state);
delegate->clearDeferredState();
QQmlEnginePrivate *ep = QQmlEnginePrivate::get(data->context->engine());
QQmlComponentPrivate::completeDeferred(ep, &localState);
} else {
delegate->clearDeferredState();
}
}
} // QtQuickPrivate
QT_END_NAMESPACE
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