/*
* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, version 2.1 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not,
* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".
*
* Description:
*
*/
#include <qstmuievent_if.h>
#include <qstmfilelogger.h>
#include "qstmzoomgesturerecogniser.h"
#include "qstmgenericsimplegesture.h"
#include "qstmutils.h"
using namespace qstmGesture ;
using namespace qstmUiEventEngine;
QStm_ZoomGestureRecogniser::QStm_ZoomGestureRecogniser(QStm_GestureListenerIf* listener) :
QStm_GestureRecogniser(listener), m_area(QRect())
{
m_rangesizeInPixels = 20 ; // by default 20 pixels from the edges is the area
m_zooming = false ;
}
QStm_ZoomGestureRecogniser::~QStm_ZoomGestureRecogniser()
{
}
QStm_GestureRecognitionState QStm_ZoomGestureRecogniser::recognise(int numOfActiveStreams,
QStm_GestureEngineIf* pge)
{
QStm_GestureRecognitionState state = m_state = ENotMyGesture;
// Check if we are enabled or not
if (!m_gestureEnabled) return state ;
// Look at the events to see if it looks like zoom with one pointer
if (numOfActiveStreams == 1) {
const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
int countOfEvents = puie->countOfEvents();
qstmUiEventEngine::QStm_UiEventCode eventCode = puie->code();
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: %d num %d code %d", eventCode, countOfEvents, eventCode);
}
if (!m_zooming) {
// We are not yet zoomin, check if we should start, i.e. whether we are
// inside the zoom trigger areas near the corners when touch is done...
if (eventCode == qstmUiEventEngine::ETouch) { // It must be ETouch inside the corner
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: 0x%x ETouch: num %d code %d, %d",
this, countOfEvents, puie->currentXY().x(), puie->currentXY().y());
LOGARG("QStm_ZoomGestureRecogniser: area, %d,%d %d,%d, range: %d",
m_area.x(), m_area.y(), m_area.x() + m_area.width(), m_area.y() + m_area.height(),
m_rangesizeInPixels);
}
// the lower left rectangle is m_rangesizeIPixels from the corner
QRect lowerleft(m_area.x(), m_area.y() + m_area.height() - m_rangesizeInPixels,
m_area.x() + m_rangesizeInPixels, m_area.y() + m_area.height()) ;
QRect upperright(m_area.x() + m_area.width() - m_rangesizeInPixels, m_area.y(),
m_area.x() + m_area.width(), m_area.y() + m_rangesizeInPixels) ;
m_previoustouch = m_startingtouch = puie->currentXY() ;
m_delta = 0 ;
if (lowerleft.contains(m_startingtouch) || upperright.contains(m_startingtouch)) {
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: ZOOM IN/OUT, (%d,%d) in %d,%d %d,%d, range: %d",
m_startingtouch.x(), m_startingtouch.y(),
m_area.x(), m_area.y(), m_area.x() + m_area.width(), m_area.y() + m_area.height(),
m_rangesizeInPixels);
}
m_zooming = true ;
if (lowerleft.contains(m_startingtouch)) {
m_zoomtype = EZoomIn ;
}
else {
m_zoomtype = EZoomOut ;
}
state = ELockToThisGesture ; // keep zooming until release
QStm_TwoPointGesture pgest(KUid, m_startingtouch, m_startingtouch);
pgest.setLogging(m_loggingenabled) ;
pgest.setDetails(&m_delta) ;
pgest.setName(m_zoomtype == EZoomIn ? QString("ZoomIn") : QString("ZoomOut")) ;
pgest.setType(m_zoomtype);
pgest.setTarget(puie->target());
// Call the listener to inform that a gesture has happened
m_listener->gestureEnter(pgest) ;
}
else {
// It is not our gesture so do nothing...
}
}
else {
// It is not touch, so not our initiating UI event.. do nothing
}
}
else {
// We are already zooming, calculate the changes in zooming factor if it looks we are still zooming
if (eventCode == qstmUiEventEngine::ERelease) { // ERelease stops zooming
// We were zooming, but if there are multiple touches we are not any more
const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
QStm_TwoPointGesture pgest = QStm_TwoPointGesture(KUid, puie->currentXY(), m_startingtouch);
m_listener->gestureExit(pgest) ; // should we call this or not?
}
else { // all other UI events will keep on zooming
state = ELockToThisGesture ; // Keep the gesture
const QPoint& p = puie->currentXY() ;
float newdist = calculateDistance(p) ;
float olddist = calculateDistance(m_previoustouch) ;
m_previoustouch = p ;
m_delta = adjustZoom(olddist, newdist) ;
state = EGestureActive ;
// Inform listener only if there is something to say
if (m_delta != 0) {
QStm_TwoPointGesture pgest = QStm_TwoPointGesture(KUid, p, m_startingtouch);
pgest.setLogging(m_loggingenabled) ;
pgest.setDetails(&m_delta) ;
pgest.setName(m_zoomtype == EZoomIn ? QString("ZoomIn") : QString("ZoomOut")) ;
pgest.setType(m_zoomtype);
pgest.setTarget(puie->target());
// Call the listener to inform that a gesture has happened
m_listener->gestureEnter(pgest) ;
}
}
}
}
else {
if (m_zooming) {
// We were zooming, but if there are multiple touches we are not any more
const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
QStm_TwoPointGesture pgest = QStm_TwoPointGesture(KUid, puie->currentXY(), m_startingtouch);
pgest.setTarget(puie->target());
m_listener->gestureExit(pgest) ; // should we call this or not?
}
m_zooming = false ;
}
m_state = state;
return state;
}
void QStm_ZoomGestureRecogniser::release(QStm_GestureEngineIf* pge)
{
if (m_zooming) {
m_zooming = false ;
const qstmUiEventEngine::QStm_UiEventIf* puie = pge->getUiEvents(0);
QStm_TwoPointGesture pgest = QStm_TwoPointGesture(KUid, puie->currentXY(), m_startingtouch);
pgest.setTarget(puie->target());
m_listener->gestureExit(pgest) ; // should we call this or not?
}
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: 0x%x release", this);
}
m_state = ENotMyGesture;
}
void QStm_ZoomGestureRecogniser::setRange(int rangeInMm)
{
m_rangesizeInPixels = QStm_Utils::mm2Pixels(rangeInMm) ;
}
void QStm_ZoomGestureRecogniser::setArea(const QRect& theArea)
{
m_area = theArea ;
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: set area, %d,%d %d,%d",
m_area.x(), m_area.y(), m_area.x() + m_area.width(), m_area.y() + m_area.height());
}
}
/*!
* calculate the distance, return as as float
*/
float QStm_ZoomGestureRecogniser::calculateDistance(const QPoint& tp)
{
const QPoint p = m_startingtouch;
return QStm_Utils::distanceF(p, tp);
/*
double x = ((m_startingtouch.iX-tp.iX)*(m_startingtouch.iX-tp.iX))+((m_startingtouch.iY-tp.iY)*(m_startingtouch.iY-tp.iY)) ;
double ddist ;
Math::Sqrt(ddist, x) ;
return ddist ;
*/
}
int QStm_ZoomGestureRecogniser::adjustZoom(float& previousDistance, float newDistance)
{
float diff = newDistance - previousDistance ;
float logdiff = diff ;
if (diff < 0) diff = -diff ;
float changePercentage = (diff/previousDistance)*100.f ;
if (changePercentage > 10.f)
{
// change more than 10%, make at most 10%
float newdiff = previousDistance*0.1f;
if (previousDistance > newDistance) newdiff = -newdiff ;
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f",
double(logdiff), double(newdiff), double(previousDistance), double(newDistance));
}
previousDistance = previousDistance + newdiff ;
diff = newdiff ;
}
else {
if (m_loggingenabled) {
LOGARG("QStm_ZoomGestureRecogniser: adjust zoom from %f to %f : was, now %f %f",
double(logdiff), double(diff), double(previousDistance), double(newDistance));
}
previousDistance = newDistance ; // accept the new value and update the new length
diff = logdiff ; // put the original back
}
return (int)diff ;
}