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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "gesturerecognizerlinjazax.h"
#include <QRegExp>
#include <QDebug>
static const int SIZE = 20;
DirectionSimpleRecognizer::DirectionSimpleRecognizer()
{
}
Direction DirectionSimpleRecognizer::addPosition(const QPoint &pos)
{
if (!directions.isEmpty()) {
const QPoint tmp = pos - directions.back().point;
if (tmp.manhattanLength() < 5)
return Direction();
}
if (lastPoint.isNull()) {
lastPoint = pos;
return Direction();
}
int dx = pos.x() - lastPoint.x();
int dy = pos.y() - lastPoint.y();
QString direction;
if (dx < 0) {
if (-1*dx >= SIZE/2)
direction = "4";
} else {
if (dx >= SIZE/2)
direction = "6";
}
if (dy < 0) {
if (-1*dy >= SIZE/2)
direction = "8";
} else {
if (dy >= SIZE/2)
direction = "2";
}
if (direction.isEmpty())
return Direction();
lastPoint = pos;
directions.push_back(Direction(direction, pos));
return Direction(direction, pos);
}
DirectionList DirectionSimpleRecognizer::getDirections() const
{
return directions;
}
void DirectionSimpleRecognizer::reset()
{
directions.clear();
lastPoint = QPoint();
}
///////////////////////////////////////////////////////////////////////////
GestureRecognizerLinjaZax::GestureRecognizerLinjaZax()
: QGestureRecognizer(QLatin1String("LinjaZax")), mousePressed(false), gestureFinished(false),
zoomState(LinjaZaxGesture::NoZoom)
{
}
QGestureRecognizer::Result GestureRecognizerLinjaZax::filterEvent(const QEvent *event)
{
if (zoomState != LinjaZaxGesture::NoZoom && !lastDirections.isEmpty()) {
lastDirections = lastDirections.right(1);
zoomState = LinjaZaxGesture::NoZoom;
}
if (event->type() == QEvent::MouseButtonPress) {
if (!currentDirection.isEmpty()) {
reset();
return QGestureRecognizer::NotGesture;
}
mousePressed = true;
const QMouseEvent *ev = static_cast<const QMouseEvent*>(event);
pressedPos = lastPos = currentPos = ev->pos();
return QGestureRecognizer::MaybeGesture;
} else if (event->type() == QEvent::MouseButtonRelease) {
const QMouseEvent *ev = static_cast<const QMouseEvent*>(event);
if (mousePressed && !currentDirection.isEmpty()) {
gestureFinished = true;
currentPos = ev->pos();
internalReset();
return QGestureRecognizer::GestureFinished;
}
reset();
return QGestureRecognizer::NotGesture;
} else if (event->type() == QEvent::MouseMove) {
if (!mousePressed)
return QGestureRecognizer::NotGesture;
lastPos = currentPos;
const QMouseEvent *ev = static_cast<const QMouseEvent*>(event);
currentPos = ev->pos();
QString direction =
simpleRecognizer.addPosition(ev->pos()).direction;
QGestureRecognizer::Result result = QGestureRecognizer::NotGesture;
if (currentDirection.isEmpty()) {
if (direction.isEmpty())
result = QGestureRecognizer::MaybeGesture;
else
result = QGestureRecognizer::GestureStarted;
} else {
result = QGestureRecognizer::GestureStarted;
}
if (!direction.isEmpty()) {
lastDirections.append(direction);
currentDirection = direction;
if (lastDirections.length() > 5)
lastDirections.remove(0, 1);
if (lastDirections.contains("248") || lastDirections.contains("2448"))
zoomState = LinjaZaxGesture::ZoomingIn;
else if (lastDirections.contains("268") || lastDirections.contains("2668"))
zoomState = LinjaZaxGesture::ZoomingOut;
}
return result;
}
return QGestureRecognizer::NotGesture;
}
static inline LinjaZaxGesture::DirectionType convertPanningDirection(const QString &direction)
{
if (direction.length() == 1) {
if (direction == "4")
return LinjaZaxGesture::Left;
else if (direction == "6")
return LinjaZaxGesture::Right;
else if (direction == "8")
return LinjaZaxGesture::Up;
else if (direction == "2")
return LinjaZaxGesture::Down;
}
return LinjaZaxGesture::None;
}
QGesture* GestureRecognizerLinjaZax::getGesture()
{
LinjaZaxGesture::DirectionType dir = convertPanningDirection(currentDirection);
LinjaZaxGesture::DirectionType lastDir = convertPanningDirection(lastDirections.right(1));
if (dir == LinjaZaxGesture::None)
return 0;
LinjaZaxGesture *g =
new LinjaZaxGesture(this, pressedPos, lastPos, currentPos,
QRect(), pressedPos, QDateTime(), 0,
gestureFinished ? Qt::GestureFinished : Qt::GestureStarted);
g->lastDirection_ = lastDir;
g->direction_ = dir;
g->zoomState_ = zoomState;
return g;
}
void GestureRecognizerLinjaZax::reset()
{
mousePressed = false;
lastDirections.clear();
currentDirection.clear();
gestureFinished = false;
simpleRecognizer.reset();
zoomState = LinjaZaxGesture::NoZoom;
}
void GestureRecognizerLinjaZax::internalReset()
{
mousePressed = false;
simpleRecognizer.reset();
}
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