ganeswidgets/src/hgcoverflowcontainer.cpp
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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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#include <QGesture>
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#include <QGraphicsSceneResizeEvent>
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#include <QPainter>
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#include <HbWidgetFeedback>
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#include "hgcoverflowcontainer.h"
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#include "hgmediawallrenderer.h"
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#include "hgwidgetitem.h"
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#include "hgcenteritemarea.h"
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#include "trace.h"
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static const qreal KCameraMaxYAngle(20);
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static const qreal KSpringVelocityToCameraYAngleFactor(2);
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HgCoverflowContainer::HgCoverflowContainer(
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    QGraphicsItem* parent) : HgContainer(parent),
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    mPrevPos(-1),
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    mAnimationAboutToEndReacted(false),
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    mCenterItemArea(0)
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{
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    mUserItemSize = QSize(250,250);
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    mUserItemSpacing = QSize(1,1);
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}
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HgCoverflowContainer::~HgCoverflowContainer()
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{
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}
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// events
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void HgCoverflowContainer::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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    QPainter::RenderHints hints = painter->renderHints();
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    painter->setRenderHint(QPainter::Antialiasing, true);
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    HgContainer::paint(painter, option, widget);
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    painter->setRenderHint(QPainter::Antialiasing, (hints.testFlag(QPainter::Antialiasing)) );
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}
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// from HgContainer
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HgMediaWallRenderer* HgCoverflowContainer::createRenderer(Qt::Orientation scrollDirection)
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{
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    HgMediaWallRenderer* renderer = new HgMediaWallRenderer(this, scrollDirection, scrollDirection, true);
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    renderer->setImageSize(mUserItemSize);
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    renderer->enableCoverflowMode(true);
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    renderer->setRowCount(1, renderer->getImageSize(), false);
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    renderer->enableReflections(true);
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    renderer->setSpacing(mUserItemSpacing);
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    renderer->setFrontCoverElevationFactor(0.5);
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    return renderer;
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}
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qreal HgCoverflowContainer::getCameraDistance(qreal springVelocity)
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{
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    return qAbs(springVelocity * 0.01f);
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}
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qreal HgCoverflowContainer::getCameraRotationY(qreal springVelocity)
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{
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    return qBound(-KCameraMaxYAngle, springVelocity * KSpringVelocityToCameraYAngleFactor, KCameraMaxYAngle);
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}
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bool HgCoverflowContainer::handleTapAction(const QPointF& pos, HgWidgetItem* hitItem, int hitItemIndex)
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{
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    Q_UNUSED(pos)
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    INFO("Tap:" << hitItem->modelIndex().row());
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    if (mSelectionMode != HgWidget::NoSelection) {
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        return handleItemSelection(hitItem);
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    }
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    if (qAbs(qreal(hitItemIndex) - mSpring.pos().x()) < 0.01f) {
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        mSelectionModel->setCurrentIndex(hitItem->modelIndex(), QItemSelectionModel::Current);
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        emit activated(hitItem->modelIndex());
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    } else {
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        mSpring.animateToPos(QPointF(hitItemIndex, 0));
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    }
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    return true;
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}
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bool HgCoverflowContainer::handleLongTapAction(const QPointF& pos, HgWidgetItem* hitItem, int hitItemIndex)
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{
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    Q_UNUSED(hitItemIndex)
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    INFO("Long tap:" << hitItem->modelIndex().row());
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    bool currentPressed = hitItem->modelIndex() == mSelectionModel->currentIndex();
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    mSelectionModel->setCurrentIndex(hitItem->modelIndex(), QItemSelectionModel::Current);
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    mSpring.animateToPos(QPointF(hitItemIndex, 0));
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    if (mHandleLongPress && currentPressed && !mSpring.isActive()) {
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        emit longPressed(hitItem->modelIndex(), pos);
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    }
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    return true;
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}
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void HgCoverflowContainer::onScrollPositionChanged(qreal pos)
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{
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    HgContainer::onScrollPositionChanged(pos);
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    if(!mAnimationAboutToEndReacted) {
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        qreal endPos = mSpring.endPos().x();
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        qreal abs = qAbs(endPos - mSpring.pos().x());
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        if( abs <= 0.5f ) {
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            HgWidgetItem* item = itemByIndex((int)endPos);
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            if (item) {
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                emit animationAboutToEnd( item->modelIndex() );
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                mAnimationAboutToEndReacted = true;
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            }
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        }
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    }
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    qreal ipos = floorf(pos);
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    qreal frac = pos - ipos;
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    qreal p = frac > 0.5 ? ipos + 1.0f : ipos;
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    if (mPrevPos != (int)p) {
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        mPrevPos = (int)p;
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        HgWidgetItem* item = itemByIndex((int)p);
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        if (item && item->modelIndex() != mSelectionModel->currentIndex()) {
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            mSelectionModel->setCurrentIndex(item->modelIndex(), QItemSelectionModel::Current);
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        }
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    }
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}
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2
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void HgCoverflowContainer::onScrollingStarted()
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{
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    mAnimationAboutToEndReacted = false;    //reset
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}
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void HgCoverflowContainer::onScrollingEnded()
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{
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    mAnimationAboutToEndReacted = false;    //reset
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}
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void HgCoverflowContainer::calculateItemSize()
0
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{
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    FUNC_LOG;
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    QRectF containerRect = contentsRect();
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    INFO("Container rect:" << containerRect);
2
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    if (!mCenterItemArea) return;
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    QRectF centerItemRect = mCenterItemArea->mapRectToParent(mCenterItemArea->contentsRect());
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    INFO("Center item rect:" << centerItemRect);
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    if (centerItemRect.isEmpty()) return;
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    QSizeF imageSize(1, 1); // Aspect ratio 1:1
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    if (!mUserItemSize.isEmpty()) {
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        imageSize = mUserItemSize; // Get aspect ration from user item size
1
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    }
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    imageSize.scale(centerItemRect.size(), Qt::KeepAspectRatio);
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    QPointF delta = centerItemRect.center() - containerRect.center();
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    INFO("Setting image size to:" << imageSize << "delta:" << delta);
0
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    mRenderer->setImageSize(imageSize);
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    mAutoSize = imageSize;
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    setFrontItemPositionDelta(delta);
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    mRenderer->setSpacing(QSizeF(1,1));
0
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}
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void HgCoverflowContainer::scrollToPosition(const QPointF& pos, bool animate)
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{
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    QPointF p = pos;
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    p.setX((int)pos.x());
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    HgContainer::scrollToPosition(p,animate);
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}
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QSizeF HgCoverflowContainer::getAutoItemSize() const
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{
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    return mAutoSize;
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}
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QSizeF HgCoverflowContainer::getAutoItemSpacing() const
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{
1
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    return QSizeF(1,1);
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}
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void HgCoverflowContainer::updateItemSizeAndSpacing()
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{
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    HgContainer::updateItemSizeAndSpacing();
2
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    updateItemSize();
1
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}
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void HgCoverflowContainer::updateItemSize()
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{
2
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    if (mItemSizePolicy == HgWidget::ItemSizeAutomatic) {
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        calculateItemSize();
1
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    }
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}
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void HgCoverflowContainer::setFrontItemPositionDelta(const QPointF& position)
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{
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    if (!mRenderer)
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        return;
2
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1
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    mRenderer->setFrontItemPosition(position);
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}
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QPointF HgCoverflowContainer::frontItemPositionDelta() const
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{
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    return mRenderer ? mRenderer->frontItemPosition() : QPointF();
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}
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5
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void HgCoverflowContainer::setFrontItemElevationFactor(qreal factor)
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{
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    mRenderer->setFrontCoverElevationFactor(factor);
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}
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void HgCoverflowContainer::enableReflections(bool enabled)
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{
20
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    mReflectionsEnabled = enabled;
1
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    if (mRenderer)
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        mRenderer->enableReflections(enabled);
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}
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bool HgCoverflowContainer::reflectionsEnabled() const
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{
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    return mReflectionsEnabled;
1
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}
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void HgCoverflowContainer::setCenterItemArea(HgCenterItemArea *centerItemArea)
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{
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    FUNC_LOG;
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    if (!mCenterItemArea) {
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        mCenterItemArea = centerItemArea;
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        connect(mCenterItemArea, SIGNAL(geometryChanged()), SLOT(updateItemSize()));
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    }
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}
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void HgCoverflowContainer::resizeEvent(QGraphicsSceneResizeEvent *event)
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{
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    HgContainer::resizeEvent(event);
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    updateItemSize();
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}
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17
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bool HgCoverflowContainer::handleTap(Qt::GestureState state, const QPointF &pos)
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{
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    FUNC_LOG;
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    bool handleGesture = false;
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    if (hasItemAt(pos)) {
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        int hitItemIndex = -1;
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        // hititem will be valid since hasItemAt returned true.
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        HgWidgetItem* hitItem = getItemAt(pos,hitItemIndex);
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        switch (state) 
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            {
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            case Qt::GestureStarted:
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                {                                
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                mIgnoreGestureAction = false;
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                if (mHandleLongPress && !mSpring.isActive()) {
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                    // in coverflow mode we react to longtap only if animation is not on and
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                    // center item is tapped.
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                    if (hitItem->modelIndex() == mSelectionModel->currentIndex()) {
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                        startLongPressWatcher(pos);
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                    }
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                }
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                mSpring.cancel();
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                break;
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                }
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            case Qt::GestureFinished:
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                {
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                // This enables tactile and audio feedback
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                HbWidgetFeedback::triggered(this, Hb::InstantPressed, 0);
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                handleGesture = handleTapAction(pos,hitItem,hitItemIndex);
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                }
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            case Qt::GestureUpdated:
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            case Qt::GestureCanceled:
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            default:
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                stopLongPressWatcher();
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                break;
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            }
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        handleGesture = true;
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    } else {
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        // User has tapped outside any item.
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        if (state == Qt::GestureStarted) {
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            // Stop scrolling.
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            mSpring.cancel();            
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        } else if ( state == Qt::GestureFinished) {
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            // Tap finished and outside any item is pressed.
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            // Lets do focus animation to current item.
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            scrollToPosition(mSpring.pos(), true);
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        }
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        mIgnoreGestureAction = true;
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    }    
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    return handleGesture;
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}
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bool HgCoverflowContainer::handleLongTap(Qt::GestureState state, const QPointF &pos)
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{
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    // base class handles long tap if item is hitted.
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    if (state == Qt::GestureUpdated && !HgContainer::handleLongTap(state, pos)) {
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        // empty area pressed. Animate current item to front.
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        scrollToPosition(mSpring.pos(), true);
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    }
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    return true;
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}
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// EOF