Refactor QQuickMultiPointHandler into public and private classes

Change-Id: Iec19664862bfbbf9a6c582dac441dda26eec57db
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

6 files changed, 204 insertions, 74 deletions

diff --git a/src/quick/handlers/handlers.pri b/src/quick/handlers/handlers.pri
index 226cca22cb..fa2f25c793 100644
--- a/src/quick/handlers/handlers.pri
+++ b/src/quick/handlers/handlers.pri
@@ -3,6 +3,7 @@ HEADERS += \
     $$PWD/qquickhandlerpoint_p.h \
     $$PWD/qquickhoverhandler_p.h \
     $$PWD/qquickmultipointhandler_p.h \
+    $$PWD/qquickmultipointhandler_p_p.h \
     $$PWD/qquickpinchhandler_p.h \
     $$PWD/qquickpointerdevicehandler_p.h \
     $$PWD/qquickpointerdevicehandler_p_p.h \
diff --git a/src/quick/handlers/qquickdraghandler.cpp b/src/quick/handlers/qquickdraghandler.cpp
index 48f0599284..1c65534bc2 100644
--- a/src/quick/handlers/qquickdraghandler.cpp
+++ b/src/quick/handlers/qquickdraghandler.cpp
@@ -103,7 +103,7 @@ bool QQuickDragHandler::targetContainsCentroid()
 
 QPointF QQuickDragHandler::targetCentroidPosition()
 {
-    QPointF pos = m_centroid.position();
+    QPointF pos = centroid().position();
     if (target() != parentItem())
         pos = parentItem()->mapToItem(target(), pos);
     return pos;
@@ -154,7 +154,7 @@ void QQuickDragHandler::handlePointerEventImpl(QQuickPointerEvent *event)
     if (active()) {
         // Calculate drag delta, taking into account the axis enabled constraint
         // i.e. if xAxis is not enabled, then ignore the horizontal component of the actual movement
-        QVector2D accumulatedDragDelta = QVector2D(m_centroid.scenePosition() - m_centroid.scenePressPosition());
+        QVector2D accumulatedDragDelta = QVector2D(centroid().scenePosition() - centroid().scenePressPosition());
         if (!m_xAxis.enabled())
             accumulatedDragDelta.setX(0);
         if (!m_yAxis.enabled())
@@ -170,9 +170,9 @@ void QQuickDragHandler::handlePointerEventImpl(QQuickPointerEvent *event)
         QVector <QQuickEventPoint *> chosenPoints;
 
         if (event->isPressEvent())
-            m_pressedInsideTarget = target() && m_currentPoints.count() > 0;
+            m_pressedInsideTarget = target() && currentPoints().count() > 0;
 
-        for (const QQuickHandlerPoint &p : m_currentPoints) {
+        for (const QQuickHandlerPoint &p : currentPoints()) {
             if (!allOverThreshold)
                 break;
             QQuickEventPoint *point = event->pointById(p.id());
diff --git a/src/quick/handlers/qquickmultipointhandler.cpp b/src/quick/handlers/qquickmultipointhandler.cpp
index baa68e5e53..ceadbf3ada 100644
--- a/src/quick/handlers/qquickmultipointhandler.cpp
+++ b/src/quick/handlers/qquickmultipointhandler.cpp
@@ -38,6 +38,7 @@
 ****************************************************************************/
 
 #include "qquickmultipointhandler_p.h"
+#include "qquickmultipointhandler_p_p.h"
 #include <private/qquickitem_p.h>
 #include <QLineF>
 #include <QMouseEvent>
@@ -59,14 +60,13 @@ QT_BEGIN_NAMESPACE
     of multiple touchpoints.
 */
 QQuickMultiPointHandler::QQuickMultiPointHandler(QQuickItem *parent, int minimumPointCount, int maximumPointCount)
-    : QQuickPointerDeviceHandler(parent)
-    , m_minimumPointCount(minimumPointCount)
-    , m_maximumPointCount(maximumPointCount)
+    : QQuickPointerDeviceHandler(*(new QQuickMultiPointHandlerPrivate(minimumPointCount, maximumPointCount)), parent)
 {
 }
 
 bool QQuickMultiPointHandler::wantsPointerEvent(QQuickPointerEvent *event)
 {
+    Q_D(QQuickMultiPointHandler);
     if (!QQuickPointerDeviceHandler::wantsPointerEvent(event))
         return false;
 
@@ -83,14 +83,14 @@ bool QQuickMultiPointHandler::wantsPointerEvent(QQuickPointerEvent *event)
     // handle a specific number of points, so a differing number of points will
     // usually result in different behavior. But otherwise if the currentPoints
     // are all still there in the event, we're good to go (do not reset
-    // m_currentPoints, because we don't want to lose the pressPosition, and do
+    // currentPoints, because we don't want to lose the pressPosition, and do
     // not want to reshuffle the order either).
     const QVector<QQuickEventPoint *> candidatePoints = eligiblePoints(event);
-    if (candidatePoints.count() != m_currentPoints.count()) {
-        m_currentPoints.clear();
+    if (candidatePoints.count() != d->currentPoints.count()) {
+        d->currentPoints.clear();
         if (active()) {
             setActive(false);
-            m_centroid.reset();
+            d->centroid.reset();
             emit centroidChanged();
         }
     } else if (hasCurrentPoints(event)) {
@@ -100,57 +100,60 @@ bool QQuickMultiPointHandler::wantsPointerEvent(QQuickPointerEvent *event)
     const bool ret = (candidatePoints.size() >= minimumPointCount() && candidatePoints.size() <= maximumPointCount());
     if (ret) {
         const int c = candidatePoints.count();
-        m_currentPoints.resize(c);
+        d->currentPoints.resize(c);
         for (int i = 0; i < c; ++i) {
-            m_currentPoints[i].reset(candidatePoints[i]);
-            m_currentPoints[i].localize(parentItem());
+            d->currentPoints[i].reset(candidatePoints[i]);
+            d->currentPoints[i].localize(parentItem());
         }
     } else {
-        m_currentPoints.clear();
+        d->currentPoints.clear();
     }
     return ret;
 }
 
 void QQuickMultiPointHandler::handlePointerEventImpl(QQuickPointerEvent *event)
 {
+    Q_D(QQuickMultiPointHandler);
     QQuickPointerHandler::handlePointerEventImpl(event);
-    // event's points can be reordered since the previous event, which is why m_currentPoints
+    // event's points can be reordered since the previous event, which is why currentPoints
     // is _not_ a shallow copy of the QQuickPointerTouchEvent::m_touchPoints vector.
-    // So we have to update our m_currentPoints instances based on the given event.
-    for (QQuickHandlerPoint &p : m_currentPoints) {
+    // So we have to update our currentPoints instances based on the given event.
+    for (QQuickHandlerPoint &p : d->currentPoints) {
         const QQuickEventPoint *ep = event->pointById(p.id());
         if (ep)
             p.reset(ep);
     }
-    QPointF sceneGrabPos = m_centroid.sceneGrabPosition();
-    m_centroid.reset(m_currentPoints);
-    m_centroid.m_sceneGrabPosition = sceneGrabPos; // preserve as it was
+    QPointF sceneGrabPos = d->centroid.sceneGrabPosition();
+    d->centroid.reset(d->currentPoints);
+    d->centroid.m_sceneGrabPosition = sceneGrabPos; // preserve as it was
     emit centroidChanged();
 }
 
 void QQuickMultiPointHandler::onActiveChanged()
 {
+    Q_D(QQuickMultiPointHandler);
     if (active()) {
-        m_centroid.m_sceneGrabPosition = m_centroid.m_scenePosition;
+        d->centroid.m_sceneGrabPosition = d->centroid.m_scenePosition;
     } else {
-        // Don't call m_centroid.reset() here, because in a QML onActiveChanged
+        // Don't call centroid.reset() here, because in a QML onActiveChanged
         // callback, we'd like to see what the position _was_, what the velocity _was_, etc.
         // (having them undefined is not useful)
         // But pressedButtons and pressedModifiers are meant to be more real-time than those
         // (which seems a bit inconsistent, from one side).
-        m_centroid.m_pressedButtons = Qt::NoButton;
-        m_centroid.m_pressedModifiers = Qt::NoModifier;
+        d->centroid.m_pressedButtons = Qt::NoButton;
+        d->centroid.m_pressedModifiers = Qt::NoModifier;
     }
 }
 
 void QQuickMultiPointHandler::onGrabChanged(QQuickPointerHandler *, QQuickEventPoint::GrabTransition transition, QQuickEventPoint *)
 {
+    Q_D(QQuickMultiPointHandler);
     // If another handler or item takes over this set of points, assume it has
     // decided that it's the better fit for them. Don't immediately re-grab
     // at the next opportunity. This should help to avoid grab cycles
     // (e.g. between DragHandler and PinchHandler).
     if (transition == QQuickEventPoint::UngrabExclusive || transition == QQuickEventPoint::CancelGrabExclusive)
-        m_currentPoints.clear();
+        d->currentPoints.clear();
 }
 
 QVector<QQuickEventPoint *> QQuickMultiPointHandler::eligiblePoints(QQuickPointerEvent *event)
@@ -190,14 +193,21 @@ QVector<QQuickEventPoint *> QQuickMultiPointHandler::eligiblePoints(QQuickPointe
 
      The default value is 2.
 */
+int QQuickMultiPointHandler::minimumPointCount() const
+{
+    Q_D(const QQuickMultiPointHandler);
+    return d->minimumPointCount;
+}
+
 void QQuickMultiPointHandler::setMinimumPointCount(int c)
 {
-    if (m_minimumPointCount == c)
+    Q_D(QQuickMultiPointHandler);
+    if (d->minimumPointCount == c)
         return;
 
-    m_minimumPointCount = c;
+    d->minimumPointCount = c;
     emit minimumPointCountChanged();
-    if (m_maximumPointCount < 0)
+    if (d->maximumPointCount < 0)
         emit maximumPointCountChanged();
 }
 
@@ -216,22 +226,61 @@ void QQuickMultiPointHandler::setMinimumPointCount(int c)
 
      The default value is the same as \l minimumPointCount.
 */
+int QQuickMultiPointHandler::maximumPointCount() const
+{
+    Q_D(const QQuickMultiPointHandler);
+    return d->maximumPointCount >= 0 ? d->maximumPointCount : d->minimumPointCount;
+}
+
 void QQuickMultiPointHandler::setMaximumPointCount(int maximumPointCount)
 {
-    if (m_maximumPointCount == maximumPointCount)
+    Q_D(QQuickMultiPointHandler);
+    if (d->maximumPointCount == maximumPointCount)
         return;
 
-    m_maximumPointCount = maximumPointCount;
+    d->maximumPointCount = maximumPointCount;
     emit maximumPointCountChanged();
 }
 
+/*!
+    \readonly
+    \qmlproperty QtQuick::HandlerPoint QtQuick::MultiPointHandler::centroid
+
+    A point exactly in the middle of the currently-pressed touch points.
+    If only one point is pressed, it's the same as that point.
+    A handler that has a \l target will normally transform it relative to this point.
+*/
+const QQuickHandlerPoint &QQuickMultiPointHandler::centroid() const
+{
+    Q_D(const QQuickMultiPointHandler);
+    return d->centroid;
+}
+
+/*!
+    Returns a modifiable reference to the point that will be returned by the
+    \l centroid property. If you modify it, you are responsible to emit
+    \l centroidChanged.
+*/
+QQuickHandlerPoint &QQuickMultiPointHandler::mutableCentroid()
+{
+    Q_D(QQuickMultiPointHandler);
+    return d->centroid;
+}
+
+QVector<QQuickHandlerPoint> &QQuickMultiPointHandler::currentPoints()
+{
+    Q_D(QQuickMultiPointHandler);
+    return d->currentPoints;
+}
+
 bool QQuickMultiPointHandler::hasCurrentPoints(QQuickPointerEvent *event)
 {
-    if (event->pointCount() < m_currentPoints.size() || m_currentPoints.size() == 0)
+    Q_D(const QQuickMultiPointHandler);
+    if (event->pointCount() < d->currentPoints.size() || d->currentPoints.size() == 0)
         return false;
     // TODO optimize: either ensure the points are sorted,
     // or use std::equal with a predicate
-    for (const QQuickHandlerPoint &p : qAsConst(m_currentPoints)) {
+    for (const QQuickHandlerPoint &p : qAsConst(d->currentPoints)) {
         const QQuickEventPoint *ep = event->pointById(p.id());
         if (!ep)
             return false;
@@ -243,30 +292,33 @@ bool QQuickMultiPointHandler::hasCurrentPoints(QQuickPointerEvent *event)
 
 qreal QQuickMultiPointHandler::averageTouchPointDistance(const QPointF &ref)
 {
+    Q_D(const QQuickMultiPointHandler);
     qreal ret = 0;
-    if (Q_UNLIKELY(m_currentPoints.size() == 0))
+    if (Q_UNLIKELY(d->currentPoints.size() == 0))
         return ret;
-    for (const QQuickHandlerPoint &p : m_currentPoints)
+    for (const QQuickHandlerPoint &p : d->currentPoints)
         ret += QVector2D(p.scenePosition() - ref).length();
-    return ret / m_currentPoints.size();
+    return ret / d->currentPoints.size();
 }
 
 qreal QQuickMultiPointHandler::averageStartingDistance(const QPointF &ref)
 {
+    Q_D(const QQuickMultiPointHandler);
     // TODO cache it in setActive()?
     qreal ret = 0;
-    if (Q_UNLIKELY(m_currentPoints.size() == 0))
+    if (Q_UNLIKELY(d->currentPoints.size() == 0))
         return ret;
-    for (const QQuickHandlerPoint &p : m_currentPoints)
+    for (const QQuickHandlerPoint &p : d->currentPoints)
         ret += QVector2D(p.sceneGrabPosition() - ref).length();
-    return ret / m_currentPoints.size();
+    return ret / d->currentPoints.size();
 }
 
 QVector<QQuickMultiPointHandler::PointData> QQuickMultiPointHandler::angles(const QPointF &ref) const
 {
+    Q_D(const QQuickMultiPointHandler);
     QVector<PointData> angles;
-    angles.reserve(m_currentPoints.count());
-    for (const QQuickHandlerPoint &p : m_currentPoints) {
+    angles.reserve(d->currentPoints.count());
+    for (const QQuickHandlerPoint &p : d->currentPoints) {
         qreal angle = QLineF(ref, p.scenePosition()).angle();
         angles.append(PointData(p.id(), -angle));     // convert to clockwise, to be consistent with QQuickItem::rotation
     }
@@ -331,17 +383,16 @@ bool QQuickMultiPointHandler::grabPoints(QVector<QQuickEventPoint *> points)
 
 void QQuickMultiPointHandler::moveTarget(QPointF pos)
 {
+    Q_D(QQuickMultiPointHandler);
     target()->setPosition(pos);
-    m_centroid.m_position = target()->mapFromScene(m_centroid.m_scenePosition);
+    d->centroid.m_position = target()->mapFromScene(d->centroid.m_scenePosition);
 }
 
-/*!
-    \readonly
-    \qmlproperty QtQuick::HandlerPoint QtQuick::MultiPointHandler::centroid
-
-    A point exactly in the middle of the currently-pressed touch points.
-    If only one point is pressed, it's the same as that point.
-    A handler that has a \l target will normally transform it relative to this point.
-*/
+QQuickMultiPointHandlerPrivate::QQuickMultiPointHandlerPrivate(int minPointCount, int maxPointCount)
+  : QQuickPointerDeviceHandlerPrivate()
+  , minimumPointCount(minPointCount)
+  , maximumPointCount(maxPointCount)
+{
+}
 
 QT_END_NAMESPACE
diff --git a/src/quick/handlers/qquickmultipointhandler_p.h b/src/quick/handlers/qquickmultipointhandler_p.h
index 06f170154b..eeb4b13b83 100644
--- a/src/quick/handlers/qquickmultipointhandler_p.h
+++ b/src/quick/handlers/qquickmultipointhandler_p.h
@@ -58,6 +58,8 @@
 
 QT_BEGIN_NAMESPACE
 
+class QQuickMultiPointHandlerPrivate;
+
 class Q_QUICK_PRIVATE_EXPORT QQuickMultiPointHandler : public QQuickPointerDeviceHandler
 {
     Q_OBJECT
@@ -68,13 +70,13 @@ class Q_QUICK_PRIVATE_EXPORT QQuickMultiPointHandler : public QQuickPointerDevic
 public:
     explicit QQuickMultiPointHandler(QQuickItem *parent = nullptr, int minimumPointCount = 2, int maximumPointCount = -1);
 
-    int minimumPointCount() const { return m_minimumPointCount; }
+    int minimumPointCount() const;
     void setMinimumPointCount(int c);
 
-    int maximumPointCount() const { return m_maximumPointCount >= 0 ? m_maximumPointCount : m_minimumPointCount; }
+    int maximumPointCount() const;
     void setMaximumPointCount(int maximumPointCount);
 
-    QQuickHandlerPoint centroid() const { return m_centroid; }
+    const QQuickHandlerPoint &centroid() const;
 
 signals:
     void minimumPointCountChanged();
@@ -94,6 +96,8 @@ protected:
     void handlePointerEventImpl(QQuickPointerEvent *event) override;
     void onActiveChanged() override;
     void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabTransition transition, QQuickEventPoint *point) override;
+    QVector<QQuickHandlerPoint> &currentPoints();
+    QQuickHandlerPoint &mutableCentroid();
     bool hasCurrentPoints(QQuickPointerEvent *event);
     QVector<QQuickEventPoint *> eligiblePoints(QQuickPointerEvent *event);
     qreal averageTouchPointDistance(const QPointF &ref);
@@ -106,11 +110,7 @@ protected:
     bool grabPoints(QVector<QQuickEventPoint *> points);
     void moveTarget(QPointF pos);
 
-protected:
-    QVector<QQuickHandlerPoint> m_currentPoints;
-    QQuickHandlerPoint m_centroid;
-    int m_minimumPointCount;
-    int m_maximumPointCount;
+    Q_DECLARE_PRIVATE(QQuickMultiPointHandler)
 };
 
 QT_END_NAMESPACE
diff --git a/src/quick/handlers/qquickmultipointhandler_p_p.h b/src/quick/handlers/qquickmultipointhandler_p_p.h
new file mode 100644
index 0000000000..d6b43fe59e
--- /dev/null
+++ b/src/quick/handlers/qquickmultipointhandler_p_p.h
@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick 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 QQUICKPOINTERMULTIHANDLER_P_H
+#define QQUICKPOINTERMULTIHANDLER_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 "qquickhandlerpoint_p.h"
+#include "qquickpointerdevicehandler_p_p.h"
+#include "qquickmultipointhandler_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_QUICK_PRIVATE_EXPORT QQuickMultiPointHandlerPrivate : public QQuickPointerDeviceHandlerPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickMultiPointHandler)
+
+public:
+    static QQuickMultiPointHandlerPrivate* get(QQuickMultiPointHandler *q) { return q->d_func(); }
+    static const QQuickMultiPointHandlerPrivate* get(const QQuickMultiPointHandler *q) { return q->d_func(); }
+
+    QQuickMultiPointHandlerPrivate(int minPointCount, int maxPointCount);
+
+    QVector<QQuickHandlerPoint> currentPoints;
+    QQuickHandlerPoint centroid;
+    int minimumPointCount;
+    int maximumPointCount;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKPOINTERMULTIHANDLER_P_H
diff --git a/src/quick/handlers/qquickpinchhandler.cpp b/src/quick/handlers/qquickpinchhandler.cpp
index d6aa39dc0d..1bee656fc3 100644
--- a/src/quick/handlers/qquickpinchhandler.cpp
+++ b/src/quick/handlers/qquickpinchhandler.cpp
@@ -267,8 +267,8 @@ void QQuickPinchHandler::onActiveChanged()
 {
     QQuickMultiPointHandler::onActiveChanged();
     if (active()) {
-        m_startAngles = angles(m_centroid.sceneGrabPosition());
-        m_startDistance = averageTouchPointDistance(m_centroid.sceneGrabPosition());
+        m_startAngles = angles(centroid().sceneGrabPosition());
+        m_startDistance = averageTouchPointDistance(centroid().sceneGrabPosition());
         m_activeRotation = 0;
         m_activeTranslation = QVector2D();
         if (const QQuickItem *t = target()) {
@@ -288,7 +288,7 @@ void QQuickPinchHandler::onActiveChanged()
 void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
 {
     if (Q_UNLIKELY(lcPinchHandler().isDebugEnabled())) {
-        for (const QQuickHandlerPoint &p : m_currentPoints)
+        for (const QQuickHandlerPoint &p : currentPoints())
             qCDebug(lcPinchHandler) << hex << p.id() << p.sceneGrabPosition() << "->" << p.scenePosition();
     }
     QQuickMultiPointHandler::handlePointerEventImpl(event);
@@ -296,13 +296,13 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
     qreal dist = 0;
 #if QT_CONFIG(gestures)
     if (const auto gesture = event->asPointerNativeGestureEvent()) {
-        m_centroid.reset(event->point(0));
+        mutableCentroid().reset(event->point(0));
         switch (gesture->type()) {
         case Qt::EndNativeGesture:
             m_activeScale = 1;
             m_activeRotation = 0;
             m_activeTranslation = QVector2D();
-            m_centroid.reset();
+            mutableCentroid().reset();
             setActive(false);
             emit updated();
             return;
@@ -327,7 +327,7 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
     {
         const bool containsReleasedPoints = event->isReleaseEvent();
         QVector<QQuickEventPoint *> chosenPoints;
-        for (const QQuickHandlerPoint &p : m_currentPoints) {
+        for (const QQuickHandlerPoint &p : currentPoints()) {
             QQuickEventPoint *ep = event->pointById(p.id());
             chosenPoints << ep;
         }
@@ -335,8 +335,8 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
             // Verify that at least one of the points has moved beyond threshold needed to activate the handler
             int numberOfPointsDraggedOverThreshold = 0;
             QVector2D accumulatedDrag;
-            const QVector2D currentCentroid(m_centroid.scenePosition());
-            const QVector2D pressCentroid(m_centroid.scenePressPosition());
+            const QVector2D currentCentroid(centroid().scenePosition());
+            const QVector2D pressCentroid(centroid().scenePressPosition());
 
             QStyleHints *styleHints = QGuiApplication::styleHints();
             const int dragThreshold = styleHints->startDragDistance();
@@ -404,9 +404,9 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
             }
 
             const bool requiredNumberOfPointsDraggedOverThreshold = numberOfPointsDraggedOverThreshold >= minimumPointCount() && numberOfPointsDraggedOverThreshold <= maximumPointCount();
-            accumulatedMovementMagnitude /= m_currentPoints.count();
+            accumulatedMovementMagnitude /= currentPoints().count();
 
-            QVector2D avgDrag = accumulatedDrag / m_currentPoints.count();
+            QVector2D avgDrag = accumulatedDrag / currentPoints().count();
             if (!xAxis()->enabled())
                 avgDrag.setX(0);
             if (!yAxis()->enabled())
@@ -439,12 +439,12 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
         // avoid mapping the minima and maxima, as they might have unmappable values
         // such as -inf/+inf. Because of this we perform the bounding to min/max in local coords.
         // 1. scale
-        dist = averageTouchPointDistance(m_centroid.scenePosition());
+        dist = averageTouchPointDistance(centroid().scenePosition());
         m_activeScale = dist / m_startDistance;
         m_activeScale = qBound(m_minimumScale/m_startScale, m_activeScale, m_maximumScale/m_startScale);
 
         // 2. rotate
-        QVector<PointData> newAngles = angles(m_centroid.scenePosition());
+        QVector<PointData> newAngles = angles(centroid().scenePosition());
         const qreal angleDelta = averageAngleDelta(m_startAngles, newAngles);
         m_activeRotation += angleDelta;
         m_startAngles = std::move(newAngles);
@@ -459,9 +459,9 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
     m_accumulatedScale = m_startScale * m_activeScale;
 
     if (target() && target()->parentItem()) {
-        const QPointF centroidParentPos = target()->parentItem()->mapFromScene(m_centroid.scenePosition());
+        const QPointF centroidParentPos = target()->parentItem()->mapFromScene(centroid().scenePosition());
         // 3. Drag/translate
-        const QPointF centroidStartParentPos = target()->parentItem()->mapFromScene(m_centroid.sceneGrabPosition());
+        const QPointF centroidStartParentPos = target()->parentItem()->mapFromScene(centroid().sceneGrabPosition());
         m_activeTranslation = QVector2D(centroidParentPos - centroidStartParentPos);
         // apply rotation + scaling around the centroid - then apply translation.
         QMatrix4x4 mat, startMatrix;
@@ -499,10 +499,10 @@ void QQuickPinchHandler::handlePointerEventImpl(QQuickPointerEvent *event)
         target()->setRotation(rotation);
         target()->setScale(m_accumulatedScale);
     } else {
-        m_activeTranslation = QVector2D(m_centroid.scenePosition() - m_centroid.scenePressPosition());
+        m_activeTranslation = QVector2D(centroid().scenePosition() - centroid().scenePressPosition());
     }
 
-    qCDebug(lcPinchHandler) << "centroid" << m_centroid.scenePressPosition() << "->"  << m_centroid.scenePosition()
+    qCDebug(lcPinchHandler) << "centroid" << centroid().scenePressPosition() << "->"  << centroid().scenePosition()
                             << ", distance" << m_startDistance << "->" << dist
                             << ", startScale" << m_startScale << "->" << m_accumulatedScale
                             << ", activeRotation" << m_activeRotation