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/****************************************************************************
**
** Copyright (C) 2018 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquicksinglepointhandler_p.h"
#include "qquicksinglepointhandler_p_p.h"
QT_BEGIN_NAMESPACE
Q_DECLARE_LOGGING_CATEGORY(DBG_TOUCH_TARGET)
/*!
\qmltype SinglePointHandler
\qmlabstract
\preliminary
\instantiates QQuickSinglePointHandler
\inherits PointerDeviceHandler
\inqmlmodule QtQuick
\brief Abstract handler for single-point Pointer Events.
An intermediate class (not registered as a QML type)
for the most common handlers: those which expect only a single point.
wantsPointerEvent() will choose the first point which is inside the
\l target item, and return true as long as the event contains that point.
Override handleEventPoint() to implement a single-point handler.
*/
QQuickSinglePointHandler::QQuickSinglePointHandler(QQuickItem *parent)
: QQuickPointerDeviceHandler(*(new QQuickSinglePointHandlerPrivate), parent)
{
}
QQuickSinglePointHandler::QQuickSinglePointHandler(QQuickSinglePointHandlerPrivate &dd, QQuickItem *parent)
: QQuickPointerDeviceHandler(dd, parent)
{
}
bool QQuickSinglePointHandler::wantsPointerEvent(QQuickPointerEvent *event)
{
Q_D(QQuickSinglePointHandler);
if (!QQuickPointerDeviceHandler::wantsPointerEvent(event))
return false;
if (event->device()->pointerType() != QQuickPointerDevice::Finger &&
(event->buttons() & acceptedButtons()) == 0 && (event->button() & acceptedButtons()) == 0)
return false;
if (d->pointInfo.id()) {
// We already know which one we want, so check whether it's there.
// It's expected to be an update or a release.
// If we no longer want it, cancel the grab.
int candidatePointCount = 0;
bool missing = true;
QQuickEventPoint *point = nullptr;
int c = event->pointCount();
for (int i = 0; i < c; ++i) {
QQuickEventPoint *p = event->point(i);
const bool found = (p->pointId() == d->pointInfo.id());
if (found)
missing = false;
if (wantsEventPoint(p)) {
++candidatePointCount;
if (found)
point = p;
}
}
if (missing)
qCWarning(DBG_TOUCH_TARGET) << this << "pointId" << hex << d->pointInfo.id()
<< "is missing from current event, but was neither canceled nor released";
if (point) {
if (candidatePointCount == 1 || (candidatePointCount > 1 && d->ignoreAdditionalPoints)) {
point->setAccepted();
return true;
} else {
point->cancelAllGrabs(this);
}
} else {
return false;
}
} else {
// We have not yet chosen a point; choose the first one for which wantsEventPoint() returns true.
int candidatePointCount = 0;
int c = event->pointCount();
QQuickEventPoint *chosen = nullptr;
for (int i = 0; i < c && !chosen; ++i) {
QQuickEventPoint *p = event->point(i);
if (!p->exclusiveGrabber() && wantsEventPoint(p)) {
if (!chosen)
chosen = p;
++candidatePointCount;
}
}
if (chosen && candidatePointCount == 1) {
setPointId(chosen->pointId());
chosen->setAccepted();
}
}
return d->pointInfo.id();
}
void QQuickSinglePointHandler::handlePointerEventImpl(QQuickPointerEvent *event)
{
Q_D(QQuickSinglePointHandler);
QQuickPointerDeviceHandler::handlePointerEventImpl(event);
QQuickEventPoint *currentPoint = event->pointById(d->pointInfo.id());
Q_ASSERT(currentPoint);
d->pointInfo.reset(currentPoint);
handleEventPoint(currentPoint);
if (currentPoint->state() == QQuickEventPoint::Released && (event->buttons() & acceptedButtons()) == Qt::NoButton) {
setExclusiveGrab(currentPoint, false);
d->reset();
}
emit pointChanged();
}
void QQuickSinglePointHandler::onGrabChanged(QQuickPointerHandler *grabber, QQuickEventPoint::GrabTransition transition, QQuickEventPoint *point)
{
Q_D(QQuickSinglePointHandler);
if (grabber != this)
return;
switch (transition) {
case QQuickEventPoint::GrabExclusive:
d->pointInfo.m_sceneGrabPosition = point->sceneGrabPosition();
setActive(true);
QQuickPointerHandler::onGrabChanged(grabber, transition, point);
break;
case QQuickEventPoint::GrabPassive:
d->pointInfo.m_sceneGrabPosition = point->sceneGrabPosition();
QQuickPointerHandler::onGrabChanged(grabber, transition, point);
break;
case QQuickEventPoint::OverrideGrabPassive:
return; // don't emit
case QQuickEventPoint::UngrabPassive:
case QQuickEventPoint::UngrabExclusive:
case QQuickEventPoint::CancelGrabPassive:
case QQuickEventPoint::CancelGrabExclusive:
// the grab is lost or relinquished, so the point is no longer relevant
QQuickPointerHandler::onGrabChanged(grabber, transition, point);
d->reset();
break;
}
}
void QQuickSinglePointHandler::setIgnoreAdditionalPoints(bool v)
{
Q_D(QQuickSinglePointHandler);
d->ignoreAdditionalPoints = v;
}
void QQuickSinglePointHandler::moveTarget(QPointF pos, QQuickEventPoint *point)
{
Q_D(QQuickSinglePointHandler);
target()->setPosition(pos);
d->pointInfo.m_scenePosition = point->scenePosition();
d->pointInfo.m_position = target()->mapFromScene(d->pointInfo.m_scenePosition);
}
void QQuickSinglePointHandler::setPointId(int id)
{
Q_D(QQuickSinglePointHandler);
d->pointInfo.m_id = id;
}
QQuickHandlerPoint QQuickSinglePointHandler::point() const
{
Q_D(const QQuickSinglePointHandler);
return d->pointInfo;
}
/*!
\readonly
\qmlproperty HandlerPoint QtQuick::SinglePointHandler::point
The event point currently being handled. When no point is currently being
handled, this object is reset to default values (all coordinates are 0).
*/
QQuickSinglePointHandlerPrivate::QQuickSinglePointHandlerPrivate()
: QQuickPointerDeviceHandlerPrivate()
{
}
void QQuickSinglePointHandlerPrivate::reset()
{
Q_Q(QQuickSinglePointHandler);
q->setActive(false);
pointInfo.reset();
}
QT_END_NAMESPACE
|
