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// Copyright (C) 2016 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 QQUICKPOINTERMULTIHANDLER_H
#define QQUICKPOINTERMULTIHANDLER_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 <QtGui/qevent.h>
#include <QtQuick/qquickitem.h>
#include "qquickhandlerpoint_p.h"
#include "qquickpointerdevicehandler_p.h"
QT_BEGIN_NAMESPACE
class QQuickMultiPointHandlerPrivate;
class Q_QUICK_EXPORT QQuickMultiPointHandler : public QQuickPointerDeviceHandler
{
Q_OBJECT
Q_PROPERTY(int minimumPointCount READ minimumPointCount WRITE setMinimumPointCount NOTIFY minimumPointCountChanged)
Q_PROPERTY(int maximumPointCount READ maximumPointCount WRITE setMaximumPointCount NOTIFY maximumPointCountChanged)
Q_PROPERTY(QQuickHandlerPoint centroid READ centroid NOTIFY centroidChanged)
public:
explicit QQuickMultiPointHandler(QQuickItem *parent = nullptr, int minimumPointCount = 2, int maximumPointCount = -1);
int minimumPointCount() const;
void setMinimumPointCount(int c);
int maximumPointCount() const;
void setMaximumPointCount(int maximumPointCount);
const QQuickHandlerPoint ¢roid() const;
Q_SIGNALS:
void minimumPointCountChanged();
void maximumPointCountChanged();
void centroidChanged();
protected:
struct PointData {
PointData() : id(0), angle(0) {}
PointData(quint64 id, qreal angle) : id(id), angle(angle) {}
quint64 id;
qreal angle;
};
bool wantsPointerEvent(QPointerEvent *event) override;
void handlePointerEventImpl(QPointerEvent *event) override;
void onActiveChanged() override;
void onGrabChanged(QQuickPointerHandler *grabber, QPointingDevice::GrabTransition transition, QPointerEvent *event, QEventPoint &point) override;
QList<QQuickHandlerPoint> ¤tPoints();
QQuickHandlerPoint &mutableCentroid();
bool hasCurrentPoints(QPointerEvent *event);
QVector<QEventPoint> eligiblePoints(QPointerEvent *event);
qreal averageTouchPointDistance(const QPointF &ref);
qreal averageStartingDistance(const QPointF &ref);
qreal averageTouchPointAngle(const QPointF &ref);
qreal averageStartingAngle(const QPointF &ref);
QVector<PointData> angles(const QPointF &ref) const;
static qreal averageAngleDelta(const QVector<PointData> &old, const QVector<PointData> &newAngles);
void acceptPoints(const QVector<QEventPoint> &points);
bool grabPoints(QPointerEvent *event, const QVector<QEventPoint> &points);
void moveTarget(QPointF pos);
Q_DECLARE_PRIVATE(QQuickMultiPointHandler)
};
QT_END_NAMESPACE
#endif // QQUICKPOINTERMULTIHANDLER_H
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