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robot.cpp Example File
^{graphicsview/dragdroprobot/robot.cpp}

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 #include <QtGui>

 #include "robot.h"

 RobotPart::RobotPart(QGraphicsItem *parent)
     : QGraphicsItem(parent), color(Qt::lightGray), dragOver(false)
 {
     setAcceptDrops(true);
 }

 void RobotPart::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
 {
     if (event->mimeData()->hasColor()
         || (qgraphicsitem_cast<RobotHead *>(this) && event->mimeData()->hasImage())) {
         event->setAccepted(true);
         dragOver = true;
         update();
     } else {
         event->setAccepted(false);
     }
 }

 void RobotPart::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
 {
     Q_UNUSED(event);
     dragOver = false;
     update();
 }

 void RobotPart::dropEvent(QGraphicsSceneDragDropEvent *event)
 {
     dragOver = false;
     if (event->mimeData()->hasColor())
         color = qVariantValue<QColor>(event->mimeData()->colorData());
     else if (event->mimeData()->hasImage())
         pixmap = qVariantValue<QPixmap>(event->mimeData()->imageData());
     update();
 }

 RobotHead::RobotHead(QGraphicsItem *parent)
     : RobotPart(parent)
 {
 }

 QRectF RobotHead::boundingRect() const
 {
     return QRectF(-15, -50, 30, 50);
 }

 void RobotHead::paint(QPainter *painter,
            const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(option);
     Q_UNUSED(widget);
     if (pixmap.isNull()) {
         painter->setBrush(dragOver ? color.light(130) : color);
         painter->drawRoundRect(-10, -30, 20, 30);
         painter->setBrush(Qt::white);
         painter->drawEllipse(-7, -3 - 20, 7, 7);
         painter->drawEllipse(0, -3 - 20, 7, 7);
         painter->setBrush(Qt::black);
         painter->drawEllipse(-5, -1 - 20, 2, 2);
         painter->drawEllipse(2, -1 - 20, 2, 2);
         painter->setPen(QPen(Qt::black, 2));
         painter->setBrush(Qt::NoBrush);
         painter->drawArc(-6, -2 - 20, 12, 15, 190 * 16, 160 * 16);
     } else {
         painter->scale(.2272, .2824);
         painter->drawPixmap(QPointF(-15 * 4.4, -50 * 3.54), pixmap);
     }
 }

 int RobotHead::type() const
 {
     return Type;
 }

 RobotTorso::RobotTorso(QGraphicsItem *parent)
     : RobotPart(parent)
 {
 }

 QRectF RobotTorso::boundingRect() const
 {
     return QRectF(-30, -20, 60, 60);
 }

 void RobotTorso::paint(QPainter *painter,
            const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(option);
     Q_UNUSED(widget);

     painter->setBrush(dragOver ? color.light(130) : color);
     painter->drawRoundRect(-20, -20, 40, 60);
     painter->drawEllipse(-25, -20, 20, 20);
     painter->drawEllipse(5, -20, 20, 20);
     painter->drawEllipse(-20, 22, 20, 20);
     painter->drawEllipse(0, 22, 20, 20);
 }

 RobotLimb::RobotLimb(QGraphicsItem *parent)
     : RobotPart(parent)
 {
 }

 QRectF RobotLimb::boundingRect() const
 {
     return QRectF(-5, -5, 40, 10);
 }

 void RobotLimb::paint(QPainter *painter,
            const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(option);
     Q_UNUSED(widget);

     painter->setBrush(dragOver ? color.light(130) : color);
     painter->drawRoundRect(boundingRect(), 50, 50);
     painter->drawEllipse(-5, -5, 10, 10);
 }

 Robot::Robot()
 {
     QGraphicsItem *torsoItem = new RobotTorso(this);
     QGraphicsItem *headItem = new RobotHead(torsoItem);
     QGraphicsItem *upperLeftArmItem = new RobotLimb(torsoItem);
     QGraphicsItem *lowerLeftArmItem = new RobotLimb(upperLeftArmItem);
     QGraphicsItem *upperRightArmItem = new RobotLimb(torsoItem);
     QGraphicsItem *lowerRightArmItem = new RobotLimb(upperRightArmItem);
     QGraphicsItem *upperRightLegItem = new RobotLimb(torsoItem);
     QGraphicsItem *lowerRightLegItem = new RobotLimb(upperRightLegItem);
     QGraphicsItem *upperLeftLegItem = new RobotLimb(torsoItem);
     QGraphicsItem *lowerLeftLegItem = new RobotLimb(upperLeftLegItem);

     headItem->setPos(0, -18);
     upperLeftArmItem->setPos(-15, -10);
     lowerLeftArmItem->setPos(30, 0);
     upperRightArmItem->setPos(15, -10);
     lowerRightArmItem->setPos(30, 0);
     upperRightLegItem->setPos(10, 32);
     lowerRightLegItem->setPos(30, 0);
     upperLeftLegItem->setPos(-10, 32);
     lowerLeftLegItem->setPos(30, 0);

     timeLine = new QTimeLine;

     QGraphicsItemAnimation *headAnimation = new QGraphicsItemAnimation;
     headAnimation->setItem(headItem);
     headAnimation->setTimeLine(timeLine);
     headAnimation->setRotationAt(0, 20);
     headAnimation->setRotationAt(1, -20);
     headAnimation->setScaleAt(1, 1.1, 1.1);

     QGraphicsItemAnimation *upperLeftArmAnimation = new QGraphicsItemAnimation;
     upperLeftArmAnimation->setItem(upperLeftArmItem);
     upperLeftArmAnimation->setTimeLine(timeLine);
     upperLeftArmAnimation->setRotationAt(0, 190);
     upperLeftArmAnimation->setRotationAt(1, 180);

     QGraphicsItemAnimation *lowerLeftArmAnimation = new QGraphicsItemAnimation;
     lowerLeftArmAnimation->setItem(lowerLeftArmItem);
     lowerLeftArmAnimation->setTimeLine(timeLine);
     lowerLeftArmAnimation->setRotationAt(0, 50);
     lowerLeftArmAnimation->setRotationAt(1, 10);

     QGraphicsItemAnimation *upperRightArmAnimation = new QGraphicsItemAnimation;
     upperRightArmAnimation->setItem(upperRightArmItem);
     upperRightArmAnimation->setTimeLine(timeLine);
     upperRightArmAnimation->setRotationAt(0, 300);
     upperRightArmAnimation->setRotationAt(1, 310);

     QGraphicsItemAnimation *lowerRightArmAnimation = new QGraphicsItemAnimation;
     lowerRightArmAnimation->setItem(lowerRightArmItem);
     lowerRightArmAnimation->setTimeLine(timeLine);
     lowerRightArmAnimation->setRotationAt(0, 0);
     lowerRightArmAnimation->setRotationAt(1, -70);

     QGraphicsItemAnimation *upperLeftLegAnimation = new QGraphicsItemAnimation;
     upperLeftLegAnimation->setItem(upperLeftLegItem);
     upperLeftLegAnimation->setTimeLine(timeLine);
     upperLeftLegAnimation->setRotationAt(0, 150);
     upperLeftLegAnimation->setRotationAt(1, 80);

     QGraphicsItemAnimation *lowerLeftLegAnimation = new QGraphicsItemAnimation;
     lowerLeftLegAnimation->setItem(lowerLeftLegItem);
     lowerLeftLegAnimation->setTimeLine(timeLine);
     lowerLeftLegAnimation->setRotationAt(0, 70);
     lowerLeftLegAnimation->setRotationAt(1, 10);

     QGraphicsItemAnimation *upperRightLegAnimation = new QGraphicsItemAnimation;
     upperRightLegAnimation->setItem(upperRightLegItem);
     upperRightLegAnimation->setTimeLine(timeLine);
     upperRightLegAnimation->setRotationAt(0, 40);
     upperRightLegAnimation->setRotationAt(1, 120);

     QGraphicsItemAnimation *lowerRightLegAnimation = new QGraphicsItemAnimation;
     lowerRightLegAnimation->setItem(lowerRightLegItem);
     lowerRightLegAnimation->setTimeLine(timeLine);
     lowerRightLegAnimation->setRotationAt(0, 10);
     lowerRightLegAnimation->setRotationAt(1, 50);

     QGraphicsItemAnimation *torsoAnimation = new QGraphicsItemAnimation;
     torsoAnimation->setItem(torsoItem);
     torsoAnimation->setTimeLine(timeLine);
     torsoAnimation->setRotationAt(0, 5);
     torsoAnimation->setRotationAt(1, -20);

     timeLine->setUpdateInterval(1000 / 25);
     timeLine->setCurveShape(QTimeLine::SineCurve);
     timeLine->setLoopCount(0);
     timeLine->setDuration(2000);
     timeLine->start();
 }

 Robot::~Robot()
 {
     delete timeLine;
 }

 QRectF Robot::boundingRect() const
 {
     return QRectF();
 }

 void Robot::paint(QPainter *painter,
                   const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
     Q_UNUSED(painter);
     Q_UNUSED(option);
     Q_UNUSED(widget);
 }