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/*
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* Copyright (c) 2009 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: Customized scroll area which handles dynamic slide loading in
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* unifiedviewer
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*
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*/
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#include "uniscrollarea.h"
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#include <HbScrollBar>
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//---------------------------------------------------------------
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//UniScrollArea :: UniScrollArea
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// @see header file
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//---------------------------------------------------------------
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UniScrollArea::UniScrollArea(QGraphicsItem * parent) :
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HbScrollArea(parent), mCurrentSlide(0), mTotalSlides(0)
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{
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bool flag = connect(this, SIGNAL(scrollingEnded()),
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this, SLOT(handleScrollingEnded()));
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bool flag1 = connect(this, SIGNAL(scrollingStarted()),
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this, SLOT(handleScrollingStarted()));
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}
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//---------------------------------------------------------------
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//UniScrollArea :: ~UniScrollArea
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// @see header file
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//---------------------------------------------------------------
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UniScrollArea::~UniScrollArea()
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{
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}
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//---------------------------------------------------------------
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//UniScrollArea :: setTotalSlides
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::setTotalSlides(int totalSlides)
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{
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mTotalSlides = totalSlides;
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}
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//---------------------------------------------------------------
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//UniScrollArea :: resetCurrentSlide
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::resetCurrentSlide()
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{
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mCurrentSlide = 0;
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}
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//---------------------------------------------------------------
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//UniScrollArea :: handleScrollingEnded
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::handleScrollingEnded()
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{
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// TODO : reduce the complexity , code readability
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// TODO : avoid calculating the heights every time
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int currentSlide = -1;
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QList<qreal> heights;
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heights.clear();
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// contents() is not available so replaced with contentWidget()
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// mScrollEndPoint = this->contents()->pos();
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mScrollEndPoint = this->contentWidget()->pos();
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// contents() is not available so replaced with contentWidget()
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QList<QGraphicsItem *> list = this->contentWidget()->childItems();
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for (int i = 0; i < list.size(); i++)
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{
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QRectF rect = list[i]->boundingRect();
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heights.append(- (rect.height()));
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}
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qreal h = 0.0;
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for (int i = 0; i < heights.size(); i++)
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{
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h += heights.at(i);
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if (mScrollEndPoint.y() > h)
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{
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currentSlide = i;
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break;
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}
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}
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if (mScrollEndPoint.y() < mScrollStartPoint.y())
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{
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//Identify if we are in last slide / last but one slide as we always
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// assume the slide next to current slide is always loaded
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//(Assumtion is based on slide initial load count of 2)
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if (currentSlide >= mTotalSlides - 1)
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{
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return;
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}
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//(This can be removed and emit signal if we cross 50% of last slide)
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if (currentSlide >= mTotalSlides - 2)
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{
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return;
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}
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//Determine how much we have scrolled & if we have scrolled beyond 50%
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//of current slide load the slide next to next slide
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qreal delta = heights.at(currentSlide) / 2;
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qreal fh = h - delta;
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if (mScrollEndPoint.y() < fh)
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{
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emit scrolledToNextSlide();
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}
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}
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}
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//---------------------------------------------------------------
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//UniScrollArea :: handleScrollingStarted
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::handleScrollingStarted()
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{
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// contents() is not available so replaced with contentWidget()
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// mScrollStartPoint = this->contents()->pos();
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mScrollStartPoint = this->contentWidget()->pos();
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}
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//---------------------------------------------------------------
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//UniScrollArea :: setPosToStart
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::setPosToStart()
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{
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// contents() is not available so replaced with contentWidget()
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QGraphicsItem* widgetItem = this->contentWidget();
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widgetItem->setPos(0, 0);
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}
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// EOF
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