/*

* Copyright (c) 2010 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: 

*

*/

#include "graphicsitemrotater.h"

#include <QtGui>

#include <QPainter>

#include <QStyleOptionGraphicsItem>

#include "utilities.h"

#include <assert.h>

GraphicsItemRotater::GraphicsItemRotater()

  : m_lastRotationValue(0)

{

    m_timeLine.setFrameRange(0, 50);

    safe_connect(&m_timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(updateRotationStep(qreal)));

    safe_connect(&m_timeLine, SIGNAL(finished()), this, SIGNAL(finished()));

}

GraphicsItemRotater::~GraphicsItemRotater() {

    if(m_pixmapItem) delete m_pixmapItem;

}

void GraphicsItemRotater::start(QGraphicsItem *item, int angle, int duration, QTimeLine::CurveShape shape) {

    m_timeLine.setDuration(duration);

    m_timeLine.setCurveShape(shape);

    // Grab a pixmap of the item.

    QRectF rect = item->boundingRect();

    QPixmap *pixmap = new QPixmap(rect.size().toSize());

    QPainter painter(pixmap);

    QStyleOptionGraphicsItem options;

    options.exposedRect = QRect(rect.toRect());

    grabItem(item, &painter, &options);

    painter.end();

//    QLabel *l = new QLabel;

//    l->setPixmap(*pixmap);

//    l->show();

    // Create a pixmap item to represent the real item during the rotation.

    m_pixmapItem = new QGraphicsPixmapItem(item->parentItem());

    item->scene()->addItem(m_pixmapItem);

    m_pixmapItem->setPos(item->pos());

    m_pixmapItem->setTransform(item->transform());

    m_pixmapItem->setPixmap(*pixmap);

    m_pixmapItem->setZValue(item->zValue());

    m_pixmapItem->show();

    m_rotationAngle = angle;

    if(m_rotationAngle < -180)

        m_rotationAngle = 360 + m_rotationAngle;

    else if(m_rotationAngle > 180)

        m_rotationAngle = m_rotationAngle - 360;

    m_rotationAngle = m_rotationAngle % 360;

    m_lastRotationValue = 0;

    m_timeLine.start();

}

void GraphicsItemRotater::updateRotationStep(qreal value)  // slot

{

    QSizeF size = m_pixmapItem->boundingRect().size();

    qreal dx = size.width()/2;

    qreal dy = size.height()/2;

    QTransform transform = m_pixmapItem->transform();

    transform.translate(dx, dy);

    transform.rotate((value - m_lastRotationValue) * m_rotationAngle);

    transform.translate(-dx, -dy);

    m_pixmapItem->setTransform(transform);

    m_lastRotationValue = value;

}

static bool zValueSort(const QGraphicsItem *item1, const QGraphicsItem *item2) {

    return item1->zValue() < item2->zValue();

}

void GraphicsItemRotater::grabItem(QGraphicsItem *item, QPainter *painter, const QStyleOptionGraphicsItem *option,

                                   QWidget *widget) {

    QList<QGraphicsItem *> childs = item->childItems();

    qSort(childs.begin(), childs.end(), zValueSort);

    foreach(QGraphicsItem *child, childs) {

        if(child->isVisible()) {

            QTransform transform = painter->transform();

            transform.translate(child->pos().x(), child->pos().y());

            painter->setTransform(transform);

            child->paint(painter, option, widget);

            transform.translate(-child->pos().x(), -child->pos().y());

            painter->setTransform(transform);

        }

    }

}