--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ginebra2/KineticHelper.cpp	Tue May 04 12:39:35 2010 +0300
@@ -0,0 +1,129 @@
+/*
+* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+#include <QTimer>
+#include <QTime>
+#include <QPoint>
+#include <QDebug> 
+
+#include "KineticHelper.h"
+
+
+
+KineticHelper::KineticHelper(KineticScrollable* scrollable, qreal decel, int kineticTimeout) :
+     m_scrollable(scrollable),
+     m_decel(decel), 
+     m_kineticTimeout(kineticTimeout)
+{
+    m_kineticTimer = new QTimer(this);
+    QObject::connect(m_kineticTimer, SIGNAL(timeout()), this, SLOT(kineticScroll()));
+    m_kineticTimer->setSingleShot(false);
+}
+
+KineticHelper::~KineticHelper()
+{
+    delete m_kineticTimer;
+}
+
+bool KineticHelper::isScrolling()
+{
+    return m_kineticTimer->isActive();
+}
+
+
+void KineticHelper::startScrolling()
+{
+	m_initialSpeed = m_scrollable->getInitialSpeed() * 1000;	
+	m_initialPos = m_scrollable->getInitialPosition();
+	if (m_kineticTimer->isActive()) {
+	    m_kineticTimer->stop();
+	}
+	m_kineticSteps = 0;
+	m_kineticScrollTime = 0.0;
+	m_kineticTimer->start(m_kineticTimeout);
+	m_actualTime = QTime::currentTime();
+	m_actualTime.start();
+	qDebug() << "starting kinetic timer at " << m_initialPos << ", at " << m_actualTime;  
+}
+
+
+void KineticHelper::kineticScroll()
+{
+    if (++m_kineticSteps == 1) return;
+    qreal decelX = m_initialSpeed.x() > 0 ? (-1) * m_decel : m_decel;
+    qreal decelY = m_initialSpeed.y() > 0 ? (-1) * m_decel : m_decel;
+    qreal dx = 0;
+    qreal dy = 0;
+    qreal vx = 0;
+    qreal vy = 0;
+
+    int t = m_actualTime.elapsed();
+    m_kineticScrollTime += (((qreal)t) / 1000);
+    
+    qDebug() << "kineticScroll(): elapsed: " << t << ", m_kineticSteps: " << m_kineticSteps << 
+                ", m_kineticScrollTime: " << m_kineticScrollTime <<
+                ", decelX: "<< decelX << ", decelY: " << decelY << ", m_initialSpeed: " << m_initialSpeed;
+    if (m_initialSpeed.x()) {
+        vx = m_initialSpeed.x() + decelX * m_kineticScrollTime;
+        qDebug() << "vx: " << vx;
+        if (vx * m_initialSpeed.x() < 0) {
+            dx = 0;
+            vx = 0;
+        }
+        else {
+            dx = m_kineticScrollTime * m_initialSpeed.x() + 
+                0.5 * decelX * m_kineticScrollTime * m_kineticScrollTime;
+        }
+    }
+    
+    if (m_initialSpeed.y()) {
+        vy = m_initialSpeed.y() + decelY * m_kineticScrollTime;
+        qDebug() << "vy: " << vy;
+        if (vy * m_initialSpeed.y() < 0) {
+            dy = 0;
+            vy = 0;
+        }
+        else {
+            dy = m_kineticScrollTime * m_initialSpeed.y() + 
+                 0.5 * decelY * m_kineticScrollTime * m_kineticScrollTime;
+        }
+    }
+        
+    QPoint scrollPos = m_scrollable->getScrollPosition();
+    QPoint distPos = m_initialPos + QPointF(dx, dy).toPoint();
+        
+    if (vx != 0 || vy != 0) {
+        qDebug() << "kineticScroll(): scroll from " << scrollPos << " to " << distPos;
+        m_scrollable->scrollTo(distPos);
+    }
+    
+    if ((vx == 0 && vy == 0) || scrollPos == m_scrollable->getScrollPosition()) {
+        qDebug() << "kineticScroll(): stopping timer";
+        stopScrolling();
+    }
+}
+
+void KineticHelper::stopScrolling()
+{
+    if (m_kineticTimer && m_kineticTimer->isActive()) {
+        m_kineticTimer->stop();
+        m_initialSpeed.setX(0.0);
+        m_initialSpeed.setY(0.0);
+    }
+    m_kineticSteps = 0;
+}
+