qquickhandlerpoint.cpp

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// Copyright (C) 2018 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
 
#include "qquickhandlerpoint_p.h"
#include "private/qquickevents_p_p.h"
#include "private/qquickdeliveryagent_p_p.h"
 
QT_BEGIN_NAMESPACE
 
QQuickHandlerPoint::QQuickHandlerPoint()
{}
 
void QQuickHandlerPoint::localize(QQuickItem *item)
{
    m_pressPosition = item->mapFromScene(m_scenePressPosition);
}
 
void QQuickHandlerPoint::reset()
{
    m_id = -1;
    m_device = QPointingDevice::primaryPointingDevice();
    m_uniqueId = QPointingDeviceUniqueId();
    m_position = QPointF();
    m_scenePosition = QPointF();
    m_pressPosition = QPointF();
    m_scenePressPosition = QPointF();
    m_sceneGrabPosition = QPointF();
    m_velocity = QVector2D();
    m_rotation = 0;
    m_pressure = 0;
    m_ellipseDiameters = QSizeF();
    m_pressedButtons = Qt::NoButton;
    m_pressedModifiers = Qt::NoModifier;
}
 
void QQuickHandlerPoint::reset(const QPointerEvent *event, const QEventPoint &point)
{
    const bool isTouch = QQuickDeliveryAgentPrivate::isTouchEvent(event);
    m_id = point.id();
    m_device = event->pointingDevice();
    const auto state = (isTouch ? static_cast<const QTouchEvent *>(event)->touchPointStates() : point.state());
    if (state.testFlag(QEventPoint::Pressed)) {
        m_pressPosition = point.position();
        m_scenePressPosition = point.scenePosition();
    }
    if (!isTouch)
        m_pressedButtons = static_cast<const QSinglePointEvent *>(event)->buttons();
    m_pressedModifiers = event->modifiers();
    if (isTouch) {
        m_uniqueId = point.uniqueId();
        m_rotation = point.rotation();
        m_pressure = point.pressure();
        m_ellipseDiameters = point.ellipseDiameters();
#if QT_CONFIG(tabletevent)
    } else if (QQuickDeliveryAgentPrivate::isTabletEvent(event)) {
        m_uniqueId = event->pointingDevice()->uniqueId();
        m_rotation = point.rotation();
        m_pressure = point.pressure();
        m_ellipseDiameters = QSizeF();
#endif
    } else {
        m_uniqueId = event->pointingDevice()->uniqueId();
        m_rotation = 0;
        m_pressure = m_pressedButtons ? 1 : 0;
        m_ellipseDiameters = QSizeF();
    }
    m_position = point.position();
    m_scenePosition = point.scenePosition();
    if (point.state() == QEventPoint::Updated)
        m_velocity = point.velocity();
}
 
void QQuickHandlerPoint::reset(const QVector<QQuickHandlerPoint> &points)
{
    if (points.isEmpty()) {
        qWarning("reset: no points");
        return;
    }
    if (points.size() == 1) {
        *this = points.first(); // copy all values
        return;
    }
    // all points are required to be from the same event
    QPointF posSum;
    QPointF scenePosSum;
    QPointF pressPosSum;
    QPointF scenePressPosSum;
    QVector2D velocitySum;
    qreal pressureSum = 0;
    QSizeF ellipseDiameterSum;
    for (const QQuickHandlerPoint &point : points) {
        posSum += point.position();
        scenePosSum += point.scenePosition();
        pressPosSum += point.pressPosition();
        scenePressPosSum += point.scenePressPosition();
        velocitySum += point.velocity();
        pressureSum += point.pressure();
        ellipseDiameterSum += point.ellipseDiameters();
    }
    m_id = -1;
    m_device = nullptr;
    m_uniqueId = QPointingDeviceUniqueId();
    // all points are required to be from the same event, so pressed buttons and modifiers should be the same
    m_pressedButtons = points.first().pressedButtons();
    m_pressedModifiers = points.first().modifiers();
    m_position = posSum / points.size();
    m_scenePosition = scenePosSum / points.size();
    m_pressPosition = pressPosSum / points.size();
    m_scenePressPosition = scenePressPosSum / points.size();
    m_velocity = velocitySum / points.size();
    m_rotation = 0; // averaging the rotations of all the points isn't very sensible
    m_pressure = pressureSum / points.size();
    m_ellipseDiameters = ellipseDiameterSum / points.size();
}
 
QT_END_NAMESPACE
 
#include "moc_qquickhandlerpoint_p.cpp"