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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#ifndef QQMLOBJECTCREATOR_P_H
#define QQMLOBJECTCREATOR_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <private/qqmlimport_p.h>
#include <private/qqmltypenamecache_p.h>
#include <private/qv4compileddata_p.h>
#include <private/qfinitestack_p.h>
#include <private/qrecursionwatcher_p.h>
#include <private/qqmlprofiler_p.h>
#include <private/qv4qmlcontext_p.h>
#include <qpointer.h>
QT_BEGIN_NAMESPACE
class QQmlAbstractBinding;
class QQmlInstantiationInterrupt;
class QQmlIncubatorPrivate;
struct AliasToRequiredInfo {
QString propertyName;
QUrl fileUrl;
};
/*!
\internal
This struct contains information solely used for displaying error messages
\variable aliasesToRequired allows us to give the user a way to know which (aliasing) properties
can be set to set the required property
\sa QQmlComponentPrivate::unsetRequiredPropertyToQQmlError
*/
struct RequiredPropertyInfo
{
QString propertyName;
QUrl fileUrl;
QV4::CompiledData::Location location;
QVector<AliasToRequiredInfo> aliasesToRequired;
};
class RequiredProperties : public QHash<QQmlPropertyData*, RequiredPropertyInfo> {};
struct QQmlObjectCreatorSharedState : public QSharedData
{
QQmlContextData *rootContext;
QQmlContextData *creationContext;
QFiniteStack<QQmlAbstractBinding::Ptr> allCreatedBindings;
QFiniteStack<QQmlParserStatus*> allParserStatusCallbacks;
QFiniteStack<QPointer<QObject> > allCreatedObjects;
QV4::Value *allJavaScriptObjects; // pointer to vector on JS stack to reference JS wrappers during creation phase.
QQmlComponentAttached *componentAttached;
QList<QQmlEnginePrivate::FinalizeCallback> finalizeCallbacks;
QQmlVmeProfiler profiler;
QRecursionNode recursionNode;
RequiredProperties requiredProperties;
bool hadRequiredProperties;
};
class Q_QML_PRIVATE_EXPORT QQmlObjectCreator
{
Q_DECLARE_TR_FUNCTIONS(QQmlObjectCreator)
public:
QQmlObjectCreator(QQmlContextData *parentContext, const QQmlRefPointer<QV4::ExecutableCompilationUnit> &compilationUnit, QQmlContextData *creationContext, QQmlIncubatorPrivate *incubator = nullptr);
~QQmlObjectCreator();
enum CreationFlags { NormalObject = 1, InlineComponent = 2 };
QObject *create(int subComponentIndex = -1, QObject *parent = nullptr, QQmlInstantiationInterrupt *interrupt = nullptr, int flags = NormalObject);
bool populateDeferredProperties(QObject *instance, const QQmlData::DeferredData *deferredData);
void beginPopulateDeferred(QQmlContextData *context);
void populateDeferredBinding(const QQmlProperty &qmlProperty, int deferredIndex,
const QV4::CompiledData::Binding *binding);
void finalizePopulateDeferred();
QQmlContextData *finalize(QQmlInstantiationInterrupt &interrupt);
void clear();
QQmlComponentAttached **componentAttachment() { return &sharedState->componentAttached; }
QList<QQmlEnginePrivate::FinalizeCallback> *finalizeCallbacks() { return &sharedState->finalizeCallbacks; }
QList<QQmlError> errors;
QQmlContextData *parentContextData() const { return parentContext.contextData(); }
QFiniteStack<QPointer<QObject> > &allCreatedObjects() { return sharedState->allCreatedObjects; }
RequiredProperties &requiredProperties() {return sharedState->requiredProperties;}
bool componentHadRequiredProperties() const {return sharedState->hadRequiredProperties;}
private:
QQmlObjectCreator(QQmlContextData *contextData, const QQmlRefPointer<QV4::ExecutableCompilationUnit> &compilationUnit, QQmlObjectCreatorSharedState *inheritedSharedState);
void init(QQmlContextData *parentContext);
QObject *createInstance(int index, QObject *parent = nullptr, bool isContextObject = false);
bool populateInstance(int index, QObject *instance,
QObject *bindingTarget, const QQmlPropertyData *valueTypeProperty);
// If qmlProperty and binding are null, populate all properties, otherwise only the given one.
void populateDeferred(QObject *instance, int deferredIndex,
const QQmlPropertyPrivate *qmlProperty = nullptr,
const QV4::CompiledData::Binding *binding = nullptr);
void setupBindings(bool applyDeferredBindings = false);
bool setPropertyBinding(const QQmlPropertyData *property, const QV4::CompiledData::Binding *binding);
void setPropertyValue(const QQmlPropertyData *property, const QV4::CompiledData::Binding *binding);
void setupFunctions();
QString stringAt(int idx) const { return compilationUnit->stringAt(idx); }
void recordError(const QV4::CompiledData::Location &location, const QString &description);
void registerObjectWithContextById(const QV4::CompiledData::Object *object, QObject *instance) const;
inline QV4::QmlContext *currentQmlContext();
Q_NEVER_INLINE void createQmlContext();
QV4::ResolvedTypeReference *resolvedType(int id) const
{
return compilationUnit->resolvedType(id);
}
enum Phase {
Startup,
CreatingObjects,
CreatingObjectsPhase2,
ObjectsCreated,
Finalizing,
Done
} phase;
QQmlEngine *engine;
QV4::ExecutionEngine *v4;
QQmlRefPointer<QV4::ExecutableCompilationUnit> compilationUnit;
const QV4::CompiledData::Unit *qmlUnit;
QQmlGuardedContextData parentContext;
QQmlContextData *context;
const QQmlPropertyCacheVector *propertyCaches;
QExplicitlySharedDataPointer<QQmlObjectCreatorSharedState> sharedState;
bool topLevelCreator;
QQmlIncubatorPrivate *incubator;
QObject *_qobject;
QObject *_scopeObject;
QObject *_bindingTarget;
const QQmlPropertyData *_valueTypeProperty; // belongs to _qobjectForBindings's property cache
int _compiledObjectIndex;
const QV4::CompiledData::Object *_compiledObject;
QQmlData *_ddata;
QQmlRefPointer<QQmlPropertyCache> _propertyCache;
QQmlVMEMetaObject *_vmeMetaObject;
QQmlListProperty<void> _currentList;
QV4::QmlContext *_qmlContext;
friend struct QQmlObjectCreatorRecursionWatcher;
typedef std::function<bool(QQmlObjectCreatorSharedState *sharedState)> PendingAliasBinding;
std::vector<PendingAliasBinding> pendingAliasBindings;
};
struct QQmlObjectCreatorRecursionWatcher
{
QQmlObjectCreatorRecursionWatcher(QQmlObjectCreator *creator);
bool hasRecursed() const { return watcher.hasRecursed(); }
private:
QExplicitlySharedDataPointer<QQmlObjectCreatorSharedState> sharedState;
QRecursionWatcher<QQmlObjectCreatorSharedState, &QQmlObjectCreatorSharedState::recursionNode> watcher;
};
QV4::QmlContext *QQmlObjectCreator::currentQmlContext()
{
if (!_qmlContext->isManaged())
_qmlContext->setM(QV4::QmlContext::create(v4->rootContext(), context, _scopeObject));
return _qmlContext;
}
QT_END_NAMESPACE
#endif // QQMLOBJECTCREATOR_P_H
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