1 /*

     2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18 

    19 #include "graphicsitemrotater.h"

    20 #include <QtGui>

    21 #include <QPainter>

    22 #include <QStyleOptionGraphicsItem>

    23 #include "utilities.h"

    24 #include <assert.h>

    25 

    26 

    27 GraphicsItemRotater::GraphicsItemRotater()

    28   : m_lastRotationValue(0)

    29 {

    30     m_timeLine.setFrameRange(0, 50);

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

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

    33 }

    34 

    35 GraphicsItemRotater::~GraphicsItemRotater() {

    36     if(m_pixmapItem) delete m_pixmapItem;

    37 }

    38 

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

    40     m_timeLine.setDuration(duration);

    41     m_timeLine.setCurveShape(shape);

    42 

    43     // Grab a pixmap of the item.

    44     QRectF rect = item->boundingRect();

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

    46     QPainter painter(pixmap);

    47     QStyleOptionGraphicsItem options;

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

    49     grabItem(item, &painter, &options);

    50     painter.end();

    51 //    QLabel *l = new QLabel;

    52 //    l->setPixmap(*pixmap);

    53 //    l->show();

    54 

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

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

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

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

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

    60     m_pixmapItem->setPixmap(*pixmap);

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

    62     m_pixmapItem->show();

    63 

    64     m_rotationAngle = angle;

    65     if(m_rotationAngle < -180)

    66         m_rotationAngle = 360 + m_rotationAngle;

    67     else if(m_rotationAngle > 180)

    68         m_rotationAngle = m_rotationAngle - 360;

    69 

    70     m_rotationAngle = m_rotationAngle % 360;

    71 

    72     m_lastRotationValue = 0;

    73     m_timeLine.start();

    74 }

    75 

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

    77 {

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

    79     qreal dx = size.width()/2;

    80     qreal dy = size.height()/2;

    81     QTransform transform = m_pixmapItem->transform();

    82     transform.translate(dx, dy);

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

    84     transform.translate(-dx, -dy);

    85     m_pixmapItem->setTransform(transform);

    86 

    87     m_lastRotationValue = value;

    88 }

    89 

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

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

    92 }

    93 

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

    95                                    QWidget *widget) {

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

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

    98     foreach(QGraphicsItem *child, childs) {

    99         if(child->isVisible()) {

   100             QTransform transform = painter->transform();

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

   102             painter->setTransform(transform);

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

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

   105             painter->setTransform(transform);

   106         }

   107     }

   108 }