qt5base-lts/tests/manual/gestures/graphicsview/gestures.cpp

132 lines
4.6 KiB
C++
Raw Normal View History

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the test suite 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "gestures.h"
#include <QTouchEvent>
Qt::GestureType ThreeFingerSlideGesture::Type = Qt::CustomGesture;
QGesture *ThreeFingerSlideGestureRecognizer::create(QObject *)
{
return new ThreeFingerSlideGesture;
}
QGestureRecognizer::Result ThreeFingerSlideGestureRecognizer::recognize(QGesture *state, QObject *, QEvent *event)
{
ThreeFingerSlideGesture *d = static_cast<ThreeFingerSlideGesture *>(state);
QGestureRecognizer::Result result;
switch (event->type()) {
case QEvent::TouchBegin:
result = QGestureRecognizer::MayBeGesture;
case QEvent::TouchEnd:
if (d->gestureFired)
result = QGestureRecognizer::FinishGesture;
else
result = QGestureRecognizer::CancelGesture;
case QEvent::TouchUpdate:
if (d->state() != Qt::NoGesture) {
QTouchEvent *ev = static_cast<QTouchEvent*>(event);
if (ev->touchPoints().size() == 3) {
d->gestureFired = true;
result = QGestureRecognizer::TriggerGesture;
} else {
result = QGestureRecognizer::MayBeGesture;
for (int i = 0; i < ev->touchPoints().size(); ++i) {
const QTouchEvent::TouchPoint &pt = ev->touchPoints().at(i);
const int distance = (pt.pos().toPoint() - pt.startPos().toPoint()).manhattanLength();
if (distance > 20) {
result = QGestureRecognizer::CancelGesture;
}
}
}
} else {
result = QGestureRecognizer::CancelGesture;
}
break;
case QEvent::MouseButtonPress:
case QEvent::MouseButtonRelease:
case QEvent::MouseMove:
if (d->state() != Qt::NoGesture)
result = QGestureRecognizer::Ignore;
else
result = QGestureRecognizer::CancelGesture;
break;
default:
result = QGestureRecognizer::Ignore;
break;
}
return result;
}
void ThreeFingerSlideGestureRecognizer::reset(QGesture *state)
{
static_cast<ThreeFingerSlideGesture *>(state)->gestureFired = false;
QGestureRecognizer::reset(state);
}
QGesture *RotateGestureRecognizer::create(QObject *)
{
return new QGesture;
}
QGestureRecognizer::Result RotateGestureRecognizer::recognize(QGesture *, QObject *, QEvent *event)
{
switch (event->type()) {
case QEvent::TouchBegin:
case QEvent::TouchEnd:
case QEvent::TouchUpdate:
break;
default:
break;
}
return QGestureRecognizer::Ignore;
}
void RotateGestureRecognizer::reset(QGesture *state)
{
QGestureRecognizer::reset(state);
}
#include "moc_gestures.cpp"