Extract Header qbindingstorage.h

QBindingStorage doesn't depend in-size on much else in qproperty.h,
but is used in-size in qobject.h, thus requiring qobject.h to include
qproperty.h.

As a first step, move the class and the bits it actually depends on,
to a separate header file, qbindingstorage.h, and, for now, just
include that from qproperty.h. The end goal here is to make qobject.h
independent of qproperty.h.

Change-Id: I44245a5e57473067e3106d1fd70bf2d744ce0a5f
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit b4c7d6b8d4b33bb1f496b288f7d199037326cd18)
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

3 files changed, 120 insertions, 62 deletions

diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index f62601d36d..9a0285d7a2 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -98,6 +98,7 @@ qt_internal_add_module(Core
         kernel/qabstractnativeeventfilter.cpp kernel/qabstractnativeeventfilter.h
         kernel/qassociativeiterable.cpp kernel/qassociativeiterable.h
         kernel/qbasictimer.cpp kernel/qbasictimer.h
+        kernel/qbindingstorage.h
         kernel/qcoreapplication.cpp kernel/qcoreapplication.h kernel/qcoreapplication_p.h
         kernel/qcoreapplication_platform.h
         kernel/qcorecmdlineargs_p.h
diff --git a/src/corelib/kernel/qbindingstorage.h b/src/corelib/kernel/qbindingstorage.h
new file mode 100644
index 0000000000..9a80acc269
--- /dev/null
+++ b/src/corelib/kernel/qbindingstorage.h
@@ -0,0 +1,117 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** 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.LGPL3 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-3.0.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 (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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>
+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;
+};
+
+
+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>
+    friend class QObjectCompatProperty;
+    friend class QObjectPrivate;
+    friend class QtPrivate::QPropertyBindingData;
+public:
+    QBindingStorage();
+    ~QBindingStorage();
+
+    bool isEmpty() { return !d; }
+
+    void registerDependency(const QUntypedPropertyData *data) const
+    {
+        if (!bindingStatus->currentlyEvaluatingBinding)
+            return;
+        registerDependency_helper(data);
+    }
+    QtPrivate::QPropertyBindingData *bindingData(const QUntypedPropertyData *data) const
+    {
+        if (!d)
+            return nullptr;
+        return bindingData_helper(data);
+    }
+    // ### Qt 7: remove unused BIC shim
+    void maybeUpdateBindingAndRegister(const QUntypedPropertyData *data) const { registerDependency(data); }
+
+    QtPrivate::QPropertyBindingData *bindingData(QUntypedPropertyData *data, bool create)
+    {
+        if (!d && !create)
+            return nullptr;
+        return bindingData_helper(data, create);
+    }
+private:
+    void clear();
+    void registerDependency_helper(const QUntypedPropertyData *data) const;
+    // ### Unused, but keep for BC
+    void maybeUpdateBindingAndRegister_helper(const QUntypedPropertyData *data) const;
+    QtPrivate::QPropertyBindingData *bindingData_helper(const QUntypedPropertyData *data) const;
+    QtPrivate::QPropertyBindingData *bindingData_helper(QUntypedPropertyData *data, bool create);
+};
+
+QT_END_NAMESPACE
+
+#endif // QBINDINGSTORAGE_H
diff --git a/src/corelib/kernel/qproperty.h b/src/corelib/kernel/qproperty.h
index 356eb43cd3..cb4f4973f0 100644
--- a/src/corelib/kernel/qproperty.h
+++ b/src/corelib/kernel/qproperty.h
@@ -43,6 +43,8 @@
 #include <QtCore/qglobal.h>
 #include <QtCore/qshareddata.h>
 #include <QtCore/qstring.h>
+#include <QtCore/qbindingstorage.h>
+
 #include <type_traits>
 
 #include <QtCore/qpropertyprivate.h>
@@ -935,68 +937,6 @@ public:
     }
 };
 
-namespace QtPrivate {
-
-struct BindingEvaluationState;
-struct CompatPropertySafePoint;
-}
-
-struct QBindingStatus
-{
-    QtPrivate::BindingEvaluationState *currentlyEvaluatingBinding = nullptr;
-    QtPrivate::CompatPropertySafePoint *currentCompatProperty = nullptr;
-    Qt::HANDLE threadId = nullptr;
-    QPropertyDelayedNotifications *groupUpdateData = nullptr;
-};
-
-
-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>
-    friend class QObjectCompatProperty;
-    friend class QObjectPrivate;
-    friend class QtPrivate::QPropertyBindingData;
-public:
-    QBindingStorage();
-    ~QBindingStorage();
-
-    bool isEmpty() { return !d; }
-
-    void registerDependency(const QUntypedPropertyData *data) const
-    {
-        if (!bindingStatus->currentlyEvaluatingBinding)
-            return;
-        registerDependency_helper(data);
-    }
-    QtPrivate::QPropertyBindingData *bindingData(const QUntypedPropertyData *data) const
-    {
-        if (!d)
-            return nullptr;
-        return bindingData_helper(data);
-    }
-    // ### Qt 7: remove unused BIC shim
-    void maybeUpdateBindingAndRegister(const QUntypedPropertyData *data) const { registerDependency(data); }
-
-    QtPrivate::QPropertyBindingData *bindingData(QUntypedPropertyData *data, bool create)
-    {
-        if (!d && !create)
-            return nullptr;
-        return bindingData_helper(data, create);
-    }
-private:
-    void clear();
-    void registerDependency_helper(const QUntypedPropertyData *data) const;
-    // ### Unused, but keep for BC
-    void maybeUpdateBindingAndRegister_helper(const QUntypedPropertyData *data) const;
-    QtPrivate::QPropertyBindingData *bindingData_helper(const QUntypedPropertyData *data) const;
-    QtPrivate::QPropertyBindingData *bindingData_helper(QUntypedPropertyData *data, bool create);
-};
-
-
 template<typename Class, typename T, auto Offset, auto Signal = nullptr>
 class QObjectBindableProperty : public QPropertyData<T>
 {