qqmlpreviewobjectpatch_p.h

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// Copyright (C) 2026 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

// Qt-Security score:significant reason:default

#ifndef QQMLPREVIEWOBJECTPATCH_P_H

#define QQMLPREVIEWOBJECTPATCH_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/qv4executablecompilationunit_p.h>

#include <QtCore/qobject.h>

#include <vector>

QT_BEGIN_NAMESPACE

namespace QQmlPreview {

enum class PatchResult: quint8 {

    Failed,         // The diff cannot be applied in place; the caller must do a full reload.

    Rebuilt,        // Component roots were rebuilt; left-over old expressions must be nulled.

    PatchedInPlace, // Trivial diff: objects kept; their old expressions must be translated.

};

PatchResult applyDiff(std::vector<QObject *> &objects,

                      const QQmlRefPointer<QV4::ExecutableCompilationUnit> &oldUnit,

                      const QQmlRefPointer<QV4::ExecutableCompilationUnit> &newUnit);

// Translate still-live expressions from oldUnit to the function at the same

// index in newUnit (or nullptr if there is no newUnit). Re-evaluate them if necessary.

void refreshBindings(const QQmlRefPointer<QV4::ExecutableCompilationUnit> &oldUnit,

                     const QQmlRefPointer<QV4::ExecutableCompilationUnit> &newUnit = {});

// Point every resolved type reference in the engine that names oldUnit at newUnit.

void redirectResolvedTypeReferences(

        QV4::ExecutionEngine *engine,

        const QQmlRefPointer<QV4::CompiledData::CompilationUnit> &oldUnit,

        const QQmlRefPointer<QV4::CompiledData::CompilationUnit> &newUnit);

} // namespace QQmlPreview

QT_END_NAMESPACE

#endif // QQMLPREVIEWOBJECTPATCH_P_H