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/****************************************************************************
**
** Copyright (C) 2016 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_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 "qquickitem.h"
#include "qevent.h"
#include "qquickhandlerpoint_p.h"
#include "qquickpointerdevicehandler_p.h"
QT_BEGIN_NAMESPACE
class Q_AUTOTEST_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 { return m_minimumPointCount; }
void setMinimumPointCount(int c);
int maximumPointCount() const { return m_maximumPointCount >= 0 ? m_maximumPointCount : m_minimumPointCount; }
void setMaximumPointCount(int maximumPointCount);
QQuickHandlerPoint centroid() const { return m_centroid; }
signals:
void minimumPointCountChanged();
void maximumPointCountChanged();
void marginChanged();
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(QQuickPointerEvent *event) override;
void handlePointerEventImpl(QQuickPointerEvent *event) override;
void onActiveChanged() override;
void onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabTransition transition, QQuickEventPoint *point) override;
bool hasCurrentPoints(QQuickPointerEvent *event);
QVector<QQuickEventPoint *> eligiblePoints(QQuickPointerEvent *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<QQuickEventPoint *> &points);
bool grabPoints(QVector<QQuickEventPoint *> points);
void moveTarget(QPointF pos);
protected:
QVector<QQuickHandlerPoint> m_currentPoints;
QQuickHandlerPoint m_centroid;
int m_minimumPointCount;
int m_maximumPointCount;
};
QT_END_NAMESPACE
QML_DECLARE_TYPE(QQuickMultiPointHandler)
#endif // QQUICKPOINTERMULTIHANDLER_H
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