Move QButtonGroup implementation from qabstractbutton.cpp to qbuttongroup.cpp

Because it's the right thing to do.

Needed to introduce qbuttongroup_p.h because QAbstractButton
likes to poke around in QButtonGroup's private parts.

Fixed includes of qabstractbutton_p.h so it compiles on it's
own.

Change-Id: Ic7725277d2419754de273b2abd4790476edd0eb4
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

5 files changed, 198 insertions, 148 deletions

diff --git a/src/widgets/widgets/qabstractbutton.cpp b/src/widgets/widgets/qabstractbutton.cpp
index fe09b0087c..2a546ac0cd 100644
--- a/src/widgets/widgets/qabstractbutton.cpp
+++ b/src/widgets/widgets/qabstractbutton.cpp
@@ -31,7 +31,9 @@
 **
 ****************************************************************************/
 
-#include "qabstractbutton.h"
+#include "private/qabstractbutton_p.h"
+
+#include "private/qbuttongroup_p.h"
 #include "qabstractitemview.h"
 #include "qbuttongroup.h"
 #include "qabstractbutton_p.h"
@@ -171,137 +173,6 @@ QAbstractButtonPrivate::QAbstractButtonPrivate(QSizePolicy::ControlType type)
     controlType(type)
 {}
 
-#ifndef QT_NO_BUTTONGROUP
-
-class QButtonGroupPrivate: public QObjectPrivate
-{
-    Q_DECLARE_PUBLIC(QButtonGroup)
-
-public:
-    QButtonGroupPrivate():exclusive(true){}
-    QList<QAbstractButton *> buttonList;
-    QPointer<QAbstractButton> checkedButton;
-    void detectCheckedButton();
-    void notifyChecked(QAbstractButton *button);
-    bool exclusive;
-    QHash<QAbstractButton*, int> mapping;
-};
-
-QButtonGroup::QButtonGroup(QObject *parent)
-    : QObject(*new QButtonGroupPrivate, parent)
-{
-}
-
-QButtonGroup::~QButtonGroup()
-{
-    Q_D(QButtonGroup);
-    for (int i = 0; i < d->buttonList.count(); ++i)
-        d->buttonList.at(i)->d_func()->group = 0;
-}
-
-
-bool QButtonGroup::exclusive() const
-{
-    Q_D(const QButtonGroup);
-    return d->exclusive;
-}
-
-void QButtonGroup::setExclusive(bool exclusive)
-{
-    Q_D(QButtonGroup);
-    d->exclusive = exclusive;
-}
-
-
-void QButtonGroup::addButton(QAbstractButton *button, int id)
-{
-    Q_D(QButtonGroup);
-    if (QButtonGroup *previous = button->d_func()->group)
-        previous->removeButton(button);
-    button->d_func()->group = this;
-    d->buttonList.append(button);
-    if (id == -1) {
-        const QHash<QAbstractButton*, int>::const_iterator it
-                = std::min_element(d->mapping.cbegin(), d->mapping.cend());
-        if (it == d->mapping.cend())
-            d->mapping[button] = -2;
-        else
-            d->mapping[button] = *it - 1;
-    } else {
-        d->mapping[button] = id;
-    }
-
-    if (d->exclusive && button->isChecked())
-        button->d_func()->notifyChecked();
-}
-
-void QButtonGroup::removeButton(QAbstractButton *button)
-{
-    Q_D(QButtonGroup);
-    if (d->checkedButton == button) {
-        d->detectCheckedButton();
-    }
-    if (button->d_func()->group == this) {
-        button->d_func()->group = 0;
-        d->buttonList.removeAll(button);
-        d->mapping.remove(button);
-    }
-}
-
-QList<QAbstractButton*> QButtonGroup::buttons() const
-{
-    Q_D(const QButtonGroup);
-    return d->buttonList;
-}
-
-QAbstractButton *QButtonGroup::checkedButton() const
-{
-    Q_D(const QButtonGroup);
-    return d->checkedButton;
-}
-
-QAbstractButton *QButtonGroup::button(int id) const
-{
-    Q_D(const QButtonGroup);
-    return d->mapping.key(id);
-}
-
-void QButtonGroup::setId(QAbstractButton *button, int id)
-{
-    Q_D(QButtonGroup);
-    if (button && id != -1)
-        d->mapping[button] = id;
-}
-
-int QButtonGroup::id(QAbstractButton *button) const
-{
-    Q_D(const QButtonGroup);
-    return d->mapping.value(button, -1);
-}
-
-int QButtonGroup::checkedId() const
-{
-    Q_D(const QButtonGroup);
-    return d->mapping.value(d->checkedButton, -1);
-}
-
-// detect a checked button other than the current one
-void QButtonGroupPrivate::detectCheckedButton()
-{
-    QAbstractButton *previous = checkedButton;
-    checkedButton = 0;
-    if (exclusive)
-        return;
-    for (int i = 0; i < buttonList.count(); i++) {
-        if (buttonList.at(i) != previous && buttonList.at(i)->isChecked()) {
-            checkedButton = buttonList.at(i);
-            return;
-        }
-    }
-}
-
-#endif // QT_NO_BUTTONGROUP
-
 QList<QAbstractButton *>QAbstractButtonPrivate::queryButtonList() const
 {
 #ifndef QT_NO_BUTTONGROUP
diff --git a/src/widgets/widgets/qabstractbutton_p.h b/src/widgets/widgets/qabstractbutton_p.h
index 0975012843..5a35b1b9cd 100644
--- a/src/widgets/widgets/qabstractbutton_p.h
+++ b/src/widgets/widgets/qabstractbutton_p.h
@@ -45,6 +45,8 @@
 // We mean it.
 //
 
+#include "qabstractbutton.h"
+
 #include "QtCore/qbasictimer.h"
 #include "private/qwidget_p.h"
 
diff --git a/src/widgets/widgets/qbuttongroup.cpp b/src/widgets/widgets/qbuttongroup.cpp
index 5a8dc5f3ef..e33f19297c 100644
--- a/src/widgets/widgets/qbuttongroup.cpp
+++ b/src/widgets/widgets/qbuttongroup.cpp
@@ -31,7 +31,28 @@
 **
 ****************************************************************************/
 
+#include "private/qbuttongroup_p.h"
 
+#ifndef QT_NO_BUTTONGROUP
+
+#include "private/qabstractbutton_p.h"
+
+QT_BEGIN_NAMESPACE
+
+// detect a checked button other than the current one
+void QButtonGroupPrivate::detectCheckedButton()
+{
+    QAbstractButton *previous = checkedButton;
+    checkedButton = 0;
+    if (exclusive)
+        return;
+    for (int i = 0; i < buttonList.count(); i++) {
+        if (buttonList.at(i) != previous && buttonList.at(i)->isChecked()) {
+            checkedButton = buttonList.at(i);
+            return;
+        }
+    }
+}
 
 /*!
     \class QButtonGroup
@@ -78,18 +99,24 @@
 */
 
 /*!
-    \fn QButtonGroup::QButtonGroup(QObject *parent)
-
     Constructs a new, empty button group with the given \a parent.
 
     \sa addButton(), setExclusive()
 */
+QButtonGroup::QButtonGroup(QObject *parent)
+    : QObject(*new QButtonGroupPrivate, parent)
+{
+}
 
 /*!
-    \fn QButtonGroup::~QButtonGroup()
-
     Destroys the button group.
 */
+QButtonGroup::~QButtonGroup()
+{
+    Q_D(QButtonGroup);
+    for (int i = 0; i < d->buttonList.count(); ++i)
+        d->buttonList.at(i)->d_func()->group = 0;
+}
 
 /*!
     \property QButtonGroup::exclusive
@@ -105,6 +132,19 @@
 
     By default, this property is \c true.
 */
+bool QButtonGroup::exclusive() const
+{
+    Q_D(const QButtonGroup);
+    return d->exclusive;
+}
+
+void QButtonGroup::setExclusive(bool exclusive)
+{
+    Q_D(QButtonGroup);
+    d->exclusive = exclusive;
+}
+
+
 
 /*!
     \fn void QButtonGroup::buttonClicked(QAbstractButton *button)
@@ -187,8 +227,6 @@
 
 
 /*!
-    \fn void QButtonGroup::addButton(QAbstractButton *button, int id = -1);
-
     Adds the given \a button to the button group. If \a id is -1,
     an id will be assigned to the button.
     Automatically assigned ids are guaranteed to be negative,
@@ -197,42 +235,82 @@
 
     \sa removeButton(), buttons()
 */
+void QButtonGroup::addButton(QAbstractButton *button, int id)
+{
+    Q_D(QButtonGroup);
+    if (QButtonGroup *previous = button->d_func()->group)
+        previous->removeButton(button);
+    button->d_func()->group = this;
+    d->buttonList.append(button);
+    if (id == -1) {
+        const QHash<QAbstractButton*, int>::const_iterator it
+                = std::min_element(d->mapping.cbegin(), d->mapping.cend());
+        if (it == d->mapping.cend())
+            d->mapping[button] = -2;
+        else
+            d->mapping[button] = *it - 1;
+    } else {
+        d->mapping[button] = id;
+    }
+
+    if (d->exclusive && button->isChecked())
+        button->d_func()->notifyChecked();
+}
 
 /*!
-    \fn void QButtonGroup::removeButton(QAbstractButton *button);
-
     Removes the given \a button from the button group.
 
     \sa addButton(), buttons()
 */
+void QButtonGroup::removeButton(QAbstractButton *button)
+{
+    Q_D(QButtonGroup);
+    if (d->checkedButton == button) {
+        d->detectCheckedButton();
+    }
+    if (button->d_func()->group == this) {
+        button->d_func()->group = 0;
+        d->buttonList.removeAll(button);
+        d->mapping.remove(button);
+    }
+}
 
 /*!
-    \fn QList<QAbstractButton*> QButtonGroup::buttons() const
-
     Returns the button group's list of buttons. This may be empty.
 
     \sa addButton(), removeButton()
 */
+QList<QAbstractButton*> QButtonGroup::buttons() const
+{
+    Q_D(const QButtonGroup);
+    return d->buttonList;
+}
 
 /*!
-    \fn QAbstractButton *QButtonGroup::checkedButton() const;
-
     Returns the button group's checked button, or 0 if no buttons are
     checked.
 
     \sa buttonClicked()
 */
+QAbstractButton *QButtonGroup::checkedButton() const
+{
+    Q_D(const QButtonGroup);
+    return d->checkedButton;
+}
 
 /*!
-    \fn QAbstractButton *QButtonGroup::button(int id) const;
     \since 4.1
 
     Returns the button with the specified \a id, or 0 if no such button
     exists.
 */
+QAbstractButton *QButtonGroup::button(int id) const
+{
+    Q_D(const QButtonGroup);
+    return d->mapping.key(id);
+}
 
 /*!
-    \fn void QButtonGroup::setId(QAbstractButton *button, int id)
     \since 4.1
 
     Sets the \a id for the specified \a button. Note that \a id cannot
@@ -240,9 +318,14 @@
 
     \sa id()
 */
+void QButtonGroup::setId(QAbstractButton *button, int id)
+{
+    Q_D(QButtonGroup);
+    if (button && id != -1)
+        d->mapping[button] = id;
+}
 
 /*!
-    \fn int QButtonGroup::id(QAbstractButton *button) const;
     \since 4.1
 
     Returns the id for the specified \a button, or -1 if no such button
@@ -251,14 +334,27 @@
 
     \sa setId()
 */
+int QButtonGroup::id(QAbstractButton *button) const
+{
+    Q_D(const QButtonGroup);
+    return d->mapping.value(button, -1);
+}
 
 /*!
-    \fn int QButtonGroup::checkedId() const;
     \since 4.1
 
     Returns the id of the checkedButton(), or -1 if no button is checked.
 
     \sa setId()
 */
+int QButtonGroup::checkedId() const
+{
+    Q_D(const QButtonGroup);
+    return d->mapping.value(d->checkedButton, -1);
+}
+
+QT_END_NAMESPACE
 
 #include "moc_qbuttongroup.cpp"
+
+#endif // QT_NO_BUTTONGROUP
diff --git a/src/widgets/widgets/qbuttongroup_p.h b/src/widgets/widgets/qbuttongroup_p.h
new file mode 100644
index 0000000000..01c0367876
--- /dev/null
+++ b/src/widgets/widgets/qbuttongroup_p.h
@@ -0,0 +1,80 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtWidgets module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QBUTTONGROUP_P_H
+#define QBUTTONGROUP_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 <QtWidgets/qbuttongroup.h>
+
+#ifndef QT_NO_BUTTONGROUP
+
+#include <QtCore/private/qobject_p.h>
+
+#include <QtCore/qlist.h>
+#include <QtCore/qpointer.h>
+#include <QtCore/qhash.h>
+
+QT_BEGIN_NAMESPACE
+
+class QButtonGroupPrivate: public QObjectPrivate
+{
+    Q_DECLARE_PUBLIC(QButtonGroup)
+
+public:
+    QButtonGroupPrivate() : exclusive(true) {}
+
+    QList<QAbstractButton *> buttonList;
+    QPointer<QAbstractButton> checkedButton;
+    void detectCheckedButton();
+    void notifyChecked(QAbstractButton *button);
+
+    bool exclusive;
+    QHash<QAbstractButton*, int> mapping;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_BUTTONGROUP
+
+#endif // QBUTTONGROUP_P_H
diff --git a/src/widgets/widgets/widgets.pri b/src/widgets/widgets/widgets.pri
index 9a3fae09a2..784055ed62 100644
--- a/src/widgets/widgets/widgets.pri
+++ b/src/widgets/widgets/widgets.pri
@@ -2,6 +2,7 @@
 
 HEADERS += \
         widgets/qbuttongroup.h \
+        widgets/qbuttongroup_p.h \
         widgets/qabstractbutton.h \
         widgets/qabstractbutton_p.h \
         widgets/qabstractslider.h \