Qt 5.11 | Qt Widgets | Drag and Drop Robot Example | robot.cpp Example File

Qt 5.11.3 Reference Documentation

# robot.cpp Example File

graphicsview/dragdroprobot/robot.cpp

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      #include <QtWidgets>

      #include "robot.h"

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

      void RobotPart::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
      {
          if (event->mimeData()->hasColor()) {
              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 = qvariant_cast<QColor>(event->mimeData()->colorData());
          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->drawRoundedRect(-10, -30, 20, 30, 25, 25, Qt::RelativeSize);
              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);
          }
      }

      void RobotHead::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
      {
          if (event->mimeData()->hasImage()) {
              event->setAccepted(true);
              dragOver = true;
              update();
          } else {
              RobotPart::dragEnterEvent(event);
          }
      }

      void RobotHead::dropEvent(QGraphicsSceneDragDropEvent *event)
      {
          if (event->mimeData()->hasImage()) {
              dragOver = false;
              pixmap = qvariant_cast<QPixmap>(event->mimeData()->imageData());
              update();
          } else {
              RobotPart::dropEvent(event);
          }
      }

      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->drawRoundedRect(-20, -20, 40, 60, 25, 25, Qt::RelativeSize);
          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->drawRoundedRect(boundingRect(), 50, 50, Qt::RelativeSize);
          painter->drawEllipse(-5, -5, 10, 10);
      }

      Robot::Robot(QGraphicsItem *parent)
          : RobotPart(parent)
      {
          setFlag(ItemHasNoContents);

          QGraphicsObject *torsoItem = new RobotTorso(this);
          QGraphicsObject *headItem = new RobotHead(torsoItem);
          QGraphicsObject *upperLeftArmItem = new RobotLimb(torsoItem);
          QGraphicsObject *lowerLeftArmItem = new RobotLimb(upperLeftArmItem);
          QGraphicsObject *upperRightArmItem = new RobotLimb(torsoItem);
          QGraphicsObject *lowerRightArmItem = new RobotLimb(upperRightArmItem);
          QGraphicsObject *upperRightLegItem = new RobotLimb(torsoItem);
          QGraphicsObject *lowerRightLegItem = new RobotLimb(upperRightLegItem);
          QGraphicsObject *upperLeftLegItem = new RobotLimb(torsoItem);
          QGraphicsObject *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);

          QParallelAnimationGroup *animation = new QParallelAnimationGroup(this);

          QPropertyAnimation *headAnimation = new QPropertyAnimation(headItem, "rotation");
          headAnimation->setStartValue(20);
          headAnimation->setEndValue(-20);
          QPropertyAnimation *headScaleAnimation = new QPropertyAnimation(headItem, "scale");
          headScaleAnimation->setEndValue(1.1);
          animation->addAnimation(headAnimation);
          animation->addAnimation(headScaleAnimation);

          QPropertyAnimation *upperLeftArmAnimation = new QPropertyAnimation(upperLeftArmItem, "rotation");
          upperLeftArmAnimation->setStartValue(190);
          upperLeftArmAnimation->setEndValue(180);
          animation->addAnimation(upperLeftArmAnimation);

          QPropertyAnimation *lowerLeftArmAnimation = new QPropertyAnimation(lowerLeftArmItem, "rotation");
          lowerLeftArmAnimation->setStartValue(50);
          lowerLeftArmAnimation->setEndValue(10);
          animation->addAnimation(lowerLeftArmAnimation);

          QPropertyAnimation *upperRightArmAnimation = new QPropertyAnimation(upperRightArmItem, "rotation");
          upperRightArmAnimation->setStartValue(300);
          upperRightArmAnimation->setEndValue(310);
          animation->addAnimation(upperRightArmAnimation);

          QPropertyAnimation *lowerRightArmAnimation = new QPropertyAnimation(lowerRightArmItem, "rotation");
          lowerRightArmAnimation->setStartValue(0);
          lowerRightArmAnimation->setEndValue(-70);
          animation->addAnimation(lowerRightArmAnimation);

          QPropertyAnimation *upperLeftLegAnimation = new QPropertyAnimation(upperLeftLegItem, "rotation");
          upperLeftLegAnimation->setStartValue(150);
          upperLeftLegAnimation->setEndValue(80);
          animation->addAnimation(upperLeftLegAnimation);

          QPropertyAnimation *lowerLeftLegAnimation = new QPropertyAnimation(lowerLeftLegItem, "rotation");
          lowerLeftLegAnimation->setStartValue(70);
          lowerLeftLegAnimation->setEndValue(10);
          animation->addAnimation(lowerLeftLegAnimation);

          QPropertyAnimation *upperRightLegAnimation = new QPropertyAnimation(upperRightLegItem, "rotation");
          upperRightLegAnimation->setStartValue(40);
          upperRightLegAnimation->setEndValue(120);
          animation->addAnimation(upperRightLegAnimation);

          QPropertyAnimation *lowerRightLegAnimation = new QPropertyAnimation(lowerRightLegItem, "rotation");
          lowerRightLegAnimation->setStartValue(10);
          lowerRightLegAnimation->setEndValue(50);
          animation->addAnimation(lowerRightLegAnimation);

          QPropertyAnimation *torsoAnimation = new QPropertyAnimation(torsoItem, "rotation");
          torsoAnimation->setStartValue(5);
          torsoAnimation->setEndValue(-20);
          animation->addAnimation(torsoAnimation);

          for (int i = 0; i < animation->animationCount(); ++i) {
              QPropertyAnimation *anim = qobject_cast<QPropertyAnimation *>(animation->animationAt(i));
              anim->setEasingCurve(QEasingCurve::SineCurve);
              anim->setDuration(2000);
          }

          animation->setLoopCount(-1);
          animation->start();
      }

      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);
      }