author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 04 May 2010 12:39:35 +0300 | |
changeset 0 | 1450b09d0cfd |
child 3 | 0954f5dd2cd0 |
child 5 | 0f2326c2a325 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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#include <QTimer> |
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#include <QTime> |
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#include <QPoint> |
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#include <QDebug> |
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#include "KineticHelper.h" |
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KineticHelper::KineticHelper(KineticScrollable* scrollable, qreal decel, int kineticTimeout) : |
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m_scrollable(scrollable), |
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m_decel(decel), |
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m_kineticTimeout(kineticTimeout) |
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{ |
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m_kineticTimer = new QTimer(this); |
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QObject::connect(m_kineticTimer, SIGNAL(timeout()), this, SLOT(kineticScroll())); |
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m_kineticTimer->setSingleShot(false); |
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} |
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KineticHelper::~KineticHelper() |
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{ |
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delete m_kineticTimer; |
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} |
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bool KineticHelper::isScrolling() |
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{ |
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return m_kineticTimer->isActive(); |
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} |
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void KineticHelper::startScrolling() |
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{ |
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m_initialSpeed = m_scrollable->getInitialSpeed() * 1000; |
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m_initialPos = m_scrollable->getInitialPosition(); |
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if (m_kineticTimer->isActive()) { |
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m_kineticTimer->stop(); |
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} |
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m_kineticSteps = 0; |
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m_kineticScrollTime = 0.0; |
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m_kineticTimer->start(m_kineticTimeout); |
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m_actualTime = QTime::currentTime(); |
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m_actualTime.start(); |
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qDebug() << "starting kinetic timer at " << m_initialPos << ", at " << m_actualTime; |
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} |
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void KineticHelper::kineticScroll() |
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{ |
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if (++m_kineticSteps == 1) return; |
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qreal decelX = m_initialSpeed.x() > 0 ? (-1) * m_decel : m_decel; |
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qreal decelY = m_initialSpeed.y() > 0 ? (-1) * m_decel : m_decel; |
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qreal dx = 0; |
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qreal dy = 0; |
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qreal vx = 0; |
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qreal vy = 0; |
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|
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int t = m_actualTime.elapsed(); |
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m_kineticScrollTime += (((qreal)t) / 1000); |
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qDebug() << "kineticScroll(): elapsed: " << t << ", m_kineticSteps: " << m_kineticSteps << |
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", m_kineticScrollTime: " << m_kineticScrollTime << |
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", decelX: "<< decelX << ", decelY: " << decelY << ", m_initialSpeed: " << m_initialSpeed; |
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if (m_initialSpeed.x()) { |
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vx = m_initialSpeed.x() + decelX * m_kineticScrollTime; |
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qDebug() << "vx: " << vx; |
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if (vx * m_initialSpeed.x() < 0) { |
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dx = 0; |
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vx = 0; |
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} |
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else { |
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dx = m_kineticScrollTime * m_initialSpeed.x() + |
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0.5 * decelX * m_kineticScrollTime * m_kineticScrollTime; |
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} |
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} |
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if (m_initialSpeed.y()) { |
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vy = m_initialSpeed.y() + decelY * m_kineticScrollTime; |
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qDebug() << "vy: " << vy; |
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if (vy * m_initialSpeed.y() < 0) { |
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dy = 0; |
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vy = 0; |
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} |
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else { |
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dy = m_kineticScrollTime * m_initialSpeed.y() + |
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0.5 * decelY * m_kineticScrollTime * m_kineticScrollTime; |
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} |
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} |
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105 |
|
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QPoint scrollPos = m_scrollable->getScrollPosition(); |
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QPoint distPos = m_initialPos + QPointF(dx, dy).toPoint(); |
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108 |
|
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if (vx != 0 || vy != 0) { |
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qDebug() << "kineticScroll(): scroll from " << scrollPos << " to " << distPos; |
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m_scrollable->scrollTo(distPos); |
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} |
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113 |
|
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if ((vx == 0 && vy == 0) || scrollPos == m_scrollable->getScrollPosition()) { |
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qDebug() << "kineticScroll(): stopping timer"; |
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stopScrolling(); |
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} |
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} |
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119 |
|
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void KineticHelper::stopScrolling() |
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{ |
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if (m_kineticTimer && m_kineticTimer->isActive()) { |
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m_kineticTimer->stop(); |
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m_initialSpeed.setX(0.0); |
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m_initialSpeed.setY(0.0); |
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} |
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m_kineticSteps = 0; |
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} |
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129 |