1 files changed, 94 insertions, 0 deletions
diff --git a/src/corelib/kernel/qbindingstorage.h b/src/corelib/kernel/qbindingstorage.h
new file mode 100644
index 0000000000..1c03b23bfa
--- /dev/null
+++ b/src/corelib/kernel/qbindingstorage.h
@@ -0,0 +1,94 @@
+// Copyright (C) 2021 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
+
+#ifndef QBINDINGSTORAGE_H
+#define QBINDINGSTORAGE_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qnamespace.h>
+
+QT_BEGIN_NAMESPACE
+
+template <typename Class, typename T, auto Offset, auto Setter, auto Signal, auto Getter>
+class QObjectCompatProperty;
+struct QPropertyDelayedNotifications;
+class QUntypedPropertyData;
+
+namespace QtPrivate {
+
+class QPropertyBindingData;
+struct BindingEvaluationState;
+struct CompatPropertySafePoint;
+}
+
+struct QBindingStatus
+{
+    QtPrivate::BindingEvaluationState *currentlyEvaluatingBinding = nullptr;
+    QtPrivate::CompatPropertySafePoint *currentCompatProperty = nullptr;
+    Qt::HANDLE threadId = nullptr;
+    QPropertyDelayedNotifications *groupUpdateData = nullptr;
+};
+
+namespace QtPrivate {
+struct QBindingStatusAccessToken;
+Q_AUTOTEST_EXPORT QBindingStatus *getBindingStatus(QBindingStatusAccessToken);
+}
+
+
+struct QBindingStorageData;
+class Q_CORE_EXPORT QBindingStorage
+{
+    mutable QBindingStorageData *d = nullptr;
+    QBindingStatus *bindingStatus = nullptr;
+
+    template<typename Class, typename T, auto Offset, auto Setter, auto Signal, auto Getter>
+    friend class QObjectCompatProperty;
+    friend class QObjectPrivate;
+    friend class QtPrivate::QPropertyBindingData;
+public:
+    QBindingStorage();
+    ~QBindingStorage();
+
+    bool isEmpty() { return !d; }
+    bool isValid() const noexcept { return bindingStatus; }
+
+    const QBindingStatus *status(QtPrivate::QBindingStatusAccessToken) const;
+
+    void registerDependency(const QUntypedPropertyData *data) const
+    {
+        if (!bindingStatus || !bindingStatus->currentlyEvaluatingBinding)
+            return;
+        registerDependency_helper(data);
+    }
+    QtPrivate::QPropertyBindingData *bindingData(const QUntypedPropertyData *data) const
+    {
+        if (!d)
+            return nullptr;
+        return bindingData_helper(data);
+    }
+
+#if QT_CORE_REMOVED_SINCE(6, 2)
+    void maybeUpdateBindingAndRegister(const QUntypedPropertyData *data) const { registerDependency(data); }
+#endif
+
+    QtPrivate::QPropertyBindingData *bindingData(QUntypedPropertyData *data, bool create)
+    {
+        if (!d && !create)
+            return nullptr;
+        return bindingData_helper(data, create);
+    }
+private:
+    void reinitAfterThreadMove();
+    void clear();
+    void registerDependency_helper(const QUntypedPropertyData *data) const;
+#if QT_CORE_REMOVED_SINCE(6, 2)
+    // ### Unused, but keep for BC
+    void maybeUpdateBindingAndRegister_helper(const QUntypedPropertyData *data) const;
+#endif
+    QtPrivate::QPropertyBindingData *bindingData_helper(const QUntypedPropertyData *data) const;
+    QtPrivate::QPropertyBindingData *bindingData_helper(QUntypedPropertyData *data, bool create);
+};
+
+QT_END_NAMESPACE
+
+#endif // QBINDINGSTORAGE_H