/*
* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: glxzoomwidget.cpp
* description of the class GlxGlxZoomWidget which controls the Zoom behavior of coverflow.
*
*/
#include <QPinchGesture>
#include <hbiconitem.h>
#include <QTimeLine>
#include <QGesture>
#include "glximagedecoderwrapper.h"
#include "glxmodelparm.h"
#include "glxzoomwidget.h"
GlxZoomWidget::GlxZoomWidget(QGraphicsItem *parent):HbScrollArea(parent), mModel(NULL), mMinZValue(MINZVALUE), mMaxZValue(MAXZVALUE), mImageDecodeRequestSend(false), mPinchGestureOngoing(false), mDecodedImageAvailable(false), mTimerId(0)
{
grabGesture(Qt::PinchGesture);
grabGesture(Qt::TapGesture);
setAcceptTouchEvents(true) ;
setFrictionEnabled(false);
setZValue(mMinZValue);
//create the child items and background
mZoomWidget = new QGraphicsWidget(this);
mZoomItem = new QGraphicsPixmapItem(mZoomWidget);
mZoomItem->setTransformationMode(Qt::SmoothTransformation);
//the black background
//replace when a proper substitute for setting backgrounds is known
mBlackBackgroundItem = new HbIconItem(this);
mBlackBackgroundItem->setBrush(QBrush(Qt::black));
mBlackBackgroundItem->hide();
//does not work so is commented
//setBackgroundItem(mBlackBackgroundItem);
//initializing the image decoder
mImageDecoder = new GlxImageDecoderWrapper;
//inititalizing the timer for animation
m_AnimTimeLine = new QTimeLine(500, this);
m_AnimTimeLine->setFrameRange(0, 100);
connect(m_AnimTimeLine, SIGNAL(frameChanged(int)), this, SLOT(animationFrameChanged(int)));
connect(m_AnimTimeLine, SIGNAL(finished()), this, SLOT(animationTimeLineFinished()));
}
GlxZoomWidget::~GlxZoomWidget()
{
//disconnect all existing signals
disconnect(this,SIGNAL( pinchGestureReceived(int) ), this, SLOT( sendDecodeRequest(int) ) );
//no Null checks required
delete mZoomItem;
// delete mZoomWidget; //as this is a content widegt it will automatically be deleted
delete mBlackBackgroundItem;
//reset the decoder to cancel pending tasks
if(mImageDecoder) {
mImageDecoder->resetDecoder();
delete mImageDecoder;
}
}
void GlxZoomWidget::setModel (QAbstractItemModel *model)
{
if(model)
{
mModel = model;
retreiveFocusedImage(); //Update mZoomItem with focused Image
connect( mModel, SIGNAL( dataChanged(QModelIndex,QModelIndex) ), this, SLOT( dataChanged(QModelIndex,QModelIndex) ) );
connect( mModel, SIGNAL( destroyed() ), this, SLOT( modelDestroyed() ) );
}
}
void GlxZoomWidget::setWindowSize(QSize windowSize)
{
mWindowSize = windowSize;
mBlackBackgroundItem->setGeometry(QRectF(QPointF(0,0), mWindowSize));
//try to reset the max and min zoomed size here
}
void GlxZoomWidget::indexChanged(int index)
{
Q_UNUSED(index);
if(mFocusIndex != index) {
mImageDecoder->resetDecoder();//reset the decoder first to cancel pending tasks
mImageDecodeRequestSend = false;
mDecodedImageAvailable = false;
retreiveFocusedImage(); //Update mZoomItem with focused Image
}
}
void GlxZoomWidget::cleanUp()
{
if(mModel) {
disconnect( mModel, SIGNAL( dataChanged(QModelIndex,QModelIndex) ), this, SLOT( dataChanged(QModelIndex,QModelIndex) ) );
disconnect( mModel, SIGNAL( destroyed() ), this, SLOT( modelDestroyed() ) );
mModel = NULL;
}
if(mImageDecoder) {
mImageDecoder->resetDecoder();
}
mZoomItem->setPixmap(QPixmap());
}
void GlxZoomWidget::activate()
{
}
void GlxZoomWidget::setMinMaxZValue(int minZvalue, int maxZvalue)
{
mMinZValue = minZvalue;
mMaxZValue = maxZvalue;
}
void GlxZoomWidget::connectDecodeRequestToPinchEvent()
{
connect(this,SIGNAL( pinchGestureReceived(int) ), this, SLOT( sendDecodeRequest(int) ), Qt::QueuedConnection );
}
bool GlxZoomWidget::sceneEvent(QEvent *event)
{
bool consume(false);
if (event->type() == QEvent::Gesture) {
consume = executeGestureEvent(this, static_cast<QGestureEvent*>(event));
}
if(!consume)
{
consume = HbScrollArea::sceneEvent(event);
}
return consume;
}
bool GlxZoomWidget::sceneEventFilter(QGraphicsItem *watched,QEvent *event)
{
qDebug("GlxCoverFlow::eventFilter " );
bool consume = false;
if (event->type() == QEvent::Gesture) {
consume = executeGestureEvent(watched, static_cast<QGestureEvent*>(event));
}
if(!consume) {
consume = HbScrollArea::sceneEventFilter(watched,event);
}
return consume;
}
bool GlxZoomWidget::executeGestureEvent(QGraphicsItem *source,QGestureEvent *event)
{
if(QTapGesture *gesture = static_cast<QTapGesture *>(event->gesture(Qt::TapGesture))) {
if (gesture->state() == Qt::GestureFinished) {
if(!mTimerId) {
mTimerId = startTimer(500);
}
else {
killTimer(mTimerId);
mTimerId = 0;
animateZoomOut(gesture->position());
}
}
event->accept(gesture);
return true;
}
if (QGesture *pinch = event->gesture(Qt::PinchGesture)) {
QPinchGesture* pinchG = static_cast<QPinchGesture *>(pinch);
QPinchGesture::ChangeFlags changeFlags = pinchG->changeFlags();
if (changeFlags & QPinchGesture::ScaleFactorChanged) {
mPinchGestureOngoing = true;
//bring the zoom widget to foreground
setZValue(mMaxZValue);
//show the black background
mBlackBackgroundItem->setParentItem(parentItem());
mBlackBackgroundItem->setZValue(mMaxZValue - 1);
mBlackBackgroundItem->show();
//retreive the gesture values
qreal value = pinchG->scaleFactor() / pinchG->lastScaleFactor();
QPointF center = pinchG->property("centerPoint").toPointF();
//set the gesture center to the scene coordinates
QPointF sceneGestureCenter = source->sceneTransform().map(center);
zoomImage(value, sceneGestureCenter);
}
if (pinchG->state() == Qt::GestureStarted) {
emit pinchGestureReceived(mFocusIndex);
}
if (pinchG->state() == Qt::GestureFinished) {
if(mStepCurrentSize != mCurrentSize) {
//For giving a spring effect when user has zoomed more than normal.
if(mStepCurrentSize.width() > mMaxScaleDecSize.width()) {
//scale the image to limited size
qreal value = mMaxScaleDecSize.width()/mCurrentSize.width();
QPointF center(mWindowSize.width()/2, mWindowSize.height()/2);
QPointF sceneGestureCenter = source->sceneTransform().map(center);
zoomImage(value, sceneGestureCenter);
}
mPinchGestureOngoing = false;
//finalize the transforms to the geometry else panning will not work
finalizeWidgetTransform();
}
//push the Zoom widget to background when zoomed image size nears FS image
if(mStepCurrentSize.width() <= mMinDecScaleSize.width()*1.3) {
mBlackBackgroundItem->hide();
//push the widget back to background
setZValue(mMinZValue);
emit zoomWidgetMovedBackground(mFocusIndex);
//do not reset the transform here as it will then zoom-in the widget to decoded image size
}
}
//gesture accepted
return true;
}
//gesture rejected
if(!mPinchGestureOngoing) {
return false;
}
return true;
}
void GlxZoomWidget::zoomImage(qreal zoomFactor, QPointF center)
{
adjustGestureCenter(center, zoomFactor);
QSizeF requiredSize(mCurrentSize.width()*zoomFactor, mCurrentSize.height()*zoomFactor);
limitRequiredSize(requiredSize);
if(requiredSize != mCurrentSize) {
QTransform zoomTransform = mZoomWidget->transform();
QPointF transformedCenter = mZoomWidget->sceneTransform().inverted().map(center);
zoomTransform.translate(transformedCenter.x(),transformedCenter.y());
zoomTransform.scale(requiredSize.width()/mCurrentSize.width(), requiredSize.height()/mCurrentSize.height());
zoomTransform.translate(-transformedCenter.x(),-transformedCenter.y());
mZoomWidget->setTransform(zoomTransform);
mCurrentSize = requiredSize;
}
}
void GlxZoomWidget::limitRequiredSize(QSizeF &requiredSize)
{
if(requiredSize.width() > mMaxScaleSize.width() ) {
requiredSize = mMaxScaleSize ;
}
else if(requiredSize.width() < mMinDecScaleSize.width() ) {
requiredSize = mMinDecScaleSize ;
}
}
//makes sure that the gesture is on the screen center if the image is smaller than the screen
void GlxZoomWidget::adjustGestureCenter(QPointF & gestureCenter, qreal& zoomFactor)
{
if(zoomFactor > 1 &&zoomFactor > 1.2 ) {
zoomFactor = 1.2;
}
if(zoomFactor < 1 &&zoomFactor < 0.8 ) {
zoomFactor = 0.8;
}
QSizeF requiredSize(mCurrentSize.width()*zoomFactor, mCurrentSize.height()*zoomFactor);
//keep smaller image centered
if(mCurrentSize.width() <= mWindowSize.width() )
{
gestureCenter.setX(mWindowSize.width()/2);
}
if(mCurrentSize.height() <= mWindowSize.height())
{
gestureCenter.setY(mWindowSize.height()/2);
}
//maintains the boundary of the edges for zoom out conditions
if(zoomFactor < 1)
{
QPointF itemOriginPos = mZoomWidget->sceneTransform().map(QPointF(0,0));
bool hasWidthExceededWindow = mCurrentSize.width() > mWindowSize.width();
bool hasHeightExceededWindow = mCurrentSize.height() > mWindowSize.height();
if(itemOriginPos.x() >= 0) {
//image has crossed left boundry leaving blank space
if(hasWidthExceededWindow) {
//stick the gesture to the left corner
gestureCenter.setX(itemOriginPos.x());
}
}
//Check if the right boundry can be adjusted
if(itemOriginPos.x()+ mCurrentSize.width() <= mWindowSize.width()) {
//Image is before the right boundry leaving blank space
if(hasWidthExceededWindow) {
//stick the gesture to the right corner
gestureCenter.setX(itemOriginPos.x()+ mCurrentSize.width());
}
}
//check if the upper boundry could be adjusted
if(itemOriginPos.y() >= 0) {
//image has crossed the upper boundry leaving blank space
if(hasHeightExceededWindow) {
//stick the image to the upper boundry
gestureCenter.setY(itemOriginPos.y());
}
}
//check if the lower boundry could be adjusted
if(itemOriginPos.y()+ mCurrentSize.height() <= mWindowSize.height()) {
//Image is before the right boundry leaving blank space
if(hasHeightExceededWindow) {
//stick the image to the right corner
gestureCenter.setY(itemOriginPos.y()+ mCurrentSize.height());
}
}
}
//control the zoom Factor to boundaries
if(mCurrentSize.width() > mWindowSize.width() && requiredSize.width() <= mWindowSize.width())
{
zoomFactor = mWindowSize.width()/mCurrentSize.width();
}
else if(mCurrentSize.height() > mWindowSize.height() && requiredSize.height() <= mWindowSize.height())
{
zoomFactor = mWindowSize.height()/mCurrentSize.height();
}
//reduce the ZF so as to show a decelerated effect at max/min levels
if(mCurrentSize.width() > mMaxScaleDecSize.width() && zoomFactor > 1 ) {
zoomFactor = 1.0 + ((zoomFactor-1.0)/6) ;
}
if(mCurrentSize.width() < mMinDecScaleSize.width() && zoomFactor < 1 ) {
zoomFactor = 1.0 - ((1.0-zoomFactor)/6) ;
}
}
//get the latest focused image and set it to mZoomItem
void GlxZoomWidget::retreiveFocusedImage()
{
QPixmap targetPixmap(getFocusedImage());
//initialize all the variables wrt the focussed pixmap
mZoomWidget->resetTransform();
mItemSize = targetPixmap.size();
mMaxScaleSize = mItemSize;
mMaxScaleSize.scale(mWindowSize*13, Qt::KeepAspectRatio);
mMaxScaleDecSize = mItemSize;
mMaxScaleDecSize.scale(mWindowSize*7, Qt::KeepAspectRatio);
mMinScaleSize = mItemSize* 0.7;
mMinDecScaleSize = mItemSize;
QPointF originPos = sceneTransform().map(QPointF(0,0));
mZoomWidget->setGeometry(QRectF(QPointF(mWindowSize.width()/2 - mItemSize.width()/2,mWindowSize.height()/2 - mItemSize.height()/2),mItemSize )); //chk this
mZoomWidget->setPreferredSize(mItemSize);
mZoomItem->setPixmap(targetPixmap);
mCurrentSize = mItemSize;
mStepCurrentSize = mItemSize;
setContentWidget(mZoomWidget);
show();
}
void GlxZoomWidget::dataChanged(QModelIndex startIndex, QModelIndex endIndex)
{
if(mFocusIndex >= startIndex.row() && mFocusIndex <= endIndex.row()) {
//get the latest image from the model
//will replace a decoded image if callback is received after decoded image is received so a fix is required
//retreiveFocusedImage();
if(!mDecodedImageAvailable) {
QPixmap targetPixmap(getFocusedImage());
mItemSize = targetPixmap.size();
mMaxScaleSize = mItemSize;
mMaxScaleSize.scale(mWindowSize*13, Qt::KeepAspectRatio);
mMaxScaleDecSize = mItemSize;
mMaxScaleDecSize.scale(mWindowSize*7, Qt::KeepAspectRatio);
mMinScaleSize = mItemSize* 0.7;
mMinDecScaleSize = mItemSize;
mZoomItem->setPixmap(targetPixmap);
finalizeWidgetTransform();
}
}
}
void GlxZoomWidget::modelDestroyed()
{
mModel = NULL ;
}
void GlxZoomWidget::indexChanged()
{
retreiveFocusedImage();
}
void GlxZoomWidget::decodedImageAvailable()
{
//new bitmap with better resolution is available
//so set it to the item
QPixmap decodedPixmap = mImageDecoder->getPixmap();
disconnect(mImageDecoder, SIGNAL(pixmapDecoded()), this, SLOT(decodedImageAvailable()));
if(decodedPixmap.isNull()){
return;
}
mDecodedImageAvailable = true;
mZoomItem->setPixmap(decodedPixmap);
mItemSize = decodedPixmap.size();
//this is important if not done then old transforms will be applied on the new image
finalizeWidgetTransform();
}
void GlxZoomWidget::sendDecodeRequest(int index)
{
if(!mImageDecodeRequestSend) {
QString imagePath = (mModel->data(mModel->index(index,0),GlxUriRole)).value<QString>();
mImageDecoder->decodeImage(imagePath);
connect(mImageDecoder, SIGNAL(pixmapDecoded()), this, SLOT(decodedImageAvailable()));
mImageDecodeRequestSend = true;
}
}
void GlxZoomWidget::finalizeWidgetTransform()
{
QPointF widgetPos = mZoomWidget->sceneTransform().map(QPointF(0,0)); //Map the origin wrt scene
mZoomWidget->resetTransform();
mZoomWidget->scale(mCurrentSize.width()/mItemSize.width(), mCurrentSize.height()/mItemSize.height());
mZoomWidget->setGeometry(QRectF(widgetPos , mCurrentSize));
// this updates HbScrollArea on the sizeHint of ZoomWidget
mZoomWidget->setPreferredSize(mCurrentSize);
mStepCurrentSize = mCurrentSize;
}
QPixmap GlxZoomWidget::getFocusedImage()
{
mFocusIndex = mModel->data(mModel->index(0,0),GlxFocusIndexRole).value<int>();
QVariant iconVariant = mModel->data(mModel->index(mFocusIndex,0),GlxFsImageRole);
QVariant sizeVariant = mModel->data(mModel->index(mFocusIndex,0),GlxDimensionsRole);
QPixmap targetPixmap;
//retreive pixmap from the HbIcon received from model
//should change the model to return and save pixmaps and convert to HbIcons Instead
if ( iconVariant.isValid() && iconVariant.canConvert<HbIcon> () ) {
QIcon itemIcon = iconVariant.value<HbIcon>().qicon();
QSize itemSize = itemIcon.actualSize(mWindowSize);
QSize scaleSize;
if(sizeVariant.isValid() && sizeVariant.canConvert<QSize> ()) {
scaleSize = sizeVariant.toSize();
if(!(scaleSize.width() < mWindowSize.width() && scaleSize.height() < mWindowSize.height())) {
scaleSize = mWindowSize;
}
}
targetPixmap = itemIcon.pixmap(itemSize).scaled(scaleSize, Qt::KeepAspectRatio);
mItemSize = targetPixmap.size();
}
return targetPixmap;
}
void GlxZoomWidget::animateZoomIn(QPointF animRefPoint)
{
emit pinchGestureReceived(mFocusIndex);
//bring the zoom widget to foreground
setZValue(mMaxZValue);
//show the black background
mBlackBackgroundItem->setParentItem(parentItem());
mBlackBackgroundItem->setZValue(mMaxZValue - 1);
mBlackBackgroundItem->show();
m_AnimRefPoint = animRefPoint;
QSizeF requiredSize = mItemSize;
requiredSize.scale(mWindowSize*3.5, Qt::KeepAspectRatio);
m_FinalAnimatedScaleFactor = requiredSize.width()/mMinDecScaleSize.width();
m_AnimTimeLine->setDirection(QTimeLine::Forward);
m_AnimTimeLine->start();
// zoomImage(5, m_AnimRefPoint);
}
void GlxZoomWidget::animateZoomOut(QPointF animRefPoint)
{
m_AnimRefPoint = animRefPoint;
m_FinalAnimatedScaleFactor = mMinDecScaleSize.width()/mCurrentSize.width();
//m_AnimTimeLine->setDirection(QTimeLine::Backward);
m_AnimTimeLine->start();
}
void GlxZoomWidget::animationFrameChanged(int frameNumber)
{
qreal scaleFactor = 1;
if(m_FinalAnimatedScaleFactor > 1) {
scaleFactor = (1.0 + (((m_FinalAnimatedScaleFactor - 1)/100)*frameNumber))/(mCurrentSize.width()/mMinDecScaleSize.width());
}
if(m_FinalAnimatedScaleFactor < 1) {
scaleFactor = (m_FinalAnimatedScaleFactor+ (((1 - m_FinalAnimatedScaleFactor)/100)*frameNumber))/(mCurrentSize.width()/mMinDecScaleSize.width());
}
zoomImage(scaleFactor, m_AnimRefPoint);
}
void GlxZoomWidget::animationTimeLineFinished()
{
finalizeWidgetTransform();
//push the Zoom widget to background when zoomed image size nears FS image
if(mStepCurrentSize.width() <= mMinDecScaleSize.width()*1.3) {
mBlackBackgroundItem->hide();
//push the widget back to background
setZValue(mMinZValue);
emit zoomWidgetMovedBackground(mFocusIndex);
//do not reset the transform here as it will then zoom-in the widget to decoded image size
}
}
void GlxZoomWidget::timerEvent(QTimerEvent *event)
{
if(mTimerId == event->timerId())
{
killTimer(mTimerId);
mTimerId = 0;
}
}