messagingapp/msgui/unifiedviewer/src/uniscrollarea.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 03 May 2010 12:29:07 +0300
changeset 25 84d9eb65b26f
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child 27 e4592d119491
permissions -rw-r--r--
Revision: 201015 Kit: 201018
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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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//---------------------------------------------------------------
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//UniScrollArea :: upGesture
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::upGesture(int value)
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{
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    Q_UNUSED(value)
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}
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//---------------------------------------------------------------
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//UniScrollArea :: downGesture
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// @see header file
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//---------------------------------------------------------------
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void UniScrollArea::downGesture(int value)
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{
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    Q_UNUSED(value)
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}
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// EOF