author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 03 May 2010 12:29:07 +0300 | |
changeset 25 | 84d9eb65b26f |
parent 23 | 238255e8b033 |
child 27 | e4592d119491 |
permissions | -rw-r--r-- |
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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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|
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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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|
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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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|
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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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//--------------------------------------------------------------- |
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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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|
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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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|
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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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|
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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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|
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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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//--------------------------------------------------------------- |
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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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//--------------------------------------------------------------- |
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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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//--------------------------------------------------------------- |
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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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|
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// EOF |