--- a/ui/views/fullscreenview/src/glxzoomwidget.cpp Thu May 27 12:51:42 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,411 +0,0 @@
- /*
-* 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 <glxmediamodel.h>
-#include "glximagedecoderwrapper.h"
-#include "glxmodelparm.h"
-#include "glxzoomwidget.h"
-
-GlxZoomWidget::GlxZoomWidget(QGraphicsItem *parent):HbScrollArea(parent), mModel(NULL), mImageDecodeRequestSend(false), mPinchGestureOngoing(false), mDecodedImageAvailable(false)
-{
- grabGesture(Qt::PinchGesture);
- setAcceptTouchEvents(true) ;
- setFrictionEnabled(false);
- setZValue(MINZVALUE);
- //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;
- connect(this,SIGNAL( pinchGestureReceived(int) ), this, SLOT( sendDecodeRequest(int) ), Qt::QueuedConnection );
-}
-
-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) ) );
- }
-}
-
-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
- }
-}
-
-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 (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(MAXZVALUE);
- //show the black background
- mBlackBackgroundItem->setParentItem(parentItem());
- mBlackBackgroundItem->setZValue(MAXZVALUE - 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(MINZVALUE);
- 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());
- mZoomItem->setPixmap(targetPixmap);
- finalizeWidgetTransform();
- }
- }
-}
-
-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::cleanUp()
-{
-// disconnect( mModel, SIGNAL( dataChanged(QModelIndex,QModelIndex) ), this, SLOT( dataChanged(QModelIndex,QModelIndex) ) );
- if(mImageDecoder) {
- mImageDecoder->resetDecoder();
- }
- mZoomItem->setPixmap(QPixmap());
-}
-
-void GlxZoomWidget::activate()
-{
-}
-
-