main.cpp Example File

animation/moveblocks/main.cpp

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  #include <QtCore>
  #include <QtWidgets>

  class StateSwitchEvent: public QEvent
  {
  public:
      StateSwitchEvent()
          : QEvent(Type(StateSwitchType))
      {
      }

      explicit StateSwitchEvent(int rand)
          : QEvent(Type(StateSwitchType)),
            m_rand(rand)
      {
      }

      enum { StateSwitchType = QEvent::User + 256 };

      int rand() const { return m_rand; }

  private:
      int m_rand;
  };

  class QGraphicsRectWidget : public QGraphicsWidget
  {
  public:
      void paint(QPainter *painter, const QStyleOptionGraphicsItem *,
                 QWidget *) Q_DECL_OVERRIDE
      {
          painter->fillRect(rect(), Qt::blue);
      }
  };

  class StateSwitchTransition: public QAbstractTransition
  {
  public:
      StateSwitchTransition(int rand)
          : QAbstractTransition(),
            m_rand(rand)
      {
      }

  protected:
      virtual bool eventTest(QEvent *event) Q_DECL_OVERRIDE
      {
          return (event->type() == QEvent::Type(StateSwitchEvent::StateSwitchType))
              && (static_cast<StateSwitchEvent *>(event)->rand() == m_rand);
      }

      virtual void onTransition(QEvent *) Q_DECL_OVERRIDE {}

  private:
      int m_rand;
  };

  class StateSwitcher : public QState
  {
      Q_OBJECT
  public:
      StateSwitcher(QStateMachine *machine)
          : QState(machine), m_stateCount(0), m_lastIndex(0)
      { }

      virtual void onEntry(QEvent *) Q_DECL_OVERRIDE
      {
          int n;
          while ((n = (qrand() % m_stateCount + 1)) == m_lastIndex)
          { }
          m_lastIndex = n;
          machine()->postEvent(new StateSwitchEvent(n));
      }
      virtual void onExit(QEvent *) Q_DECL_OVERRIDE {}

      void addState(QState *state, QAbstractAnimation *animation) {
          StateSwitchTransition *trans = new StateSwitchTransition(++m_stateCount);
          trans->setTargetState(state);
          addTransition(trans);
          trans->addAnimation(animation);
      }

  private:
      int m_stateCount;
      int m_lastIndex;
  };

  QState *createGeometryState(QObject *w1, const QRect &rect1,
                              QObject *w2, const QRect &rect2,
                              QObject *w3, const QRect &rect3,
                              QObject *w4, const QRect &rect4,
                              QState *parent)
  {
      QState *result = new QState(parent);
      result->assignProperty(w1, "geometry", rect1);
      result->assignProperty(w2, "geometry", rect2);
      result->assignProperty(w3, "geometry", rect3);
      result->assignProperty(w4, "geometry", rect4);

      return result;
  }

  class GraphicsView : public QGraphicsView
  {
      Q_OBJECT
  public:
      GraphicsView(QGraphicsScene *scene, QWidget *parent = NULL) : QGraphicsView(scene, parent)
      {
      }

  protected:
      virtual void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE
      {
          fitInView(scene()->sceneRect());
          QGraphicsView::resizeEvent(event);
      }
  };

  int main(int argc, char **argv)
  {
      QApplication app(argc, argv);

      QGraphicsRectWidget *button1 = new QGraphicsRectWidget;
      QGraphicsRectWidget *button2 = new QGraphicsRectWidget;
      QGraphicsRectWidget *button3 = new QGraphicsRectWidget;
      QGraphicsRectWidget *button4 = new QGraphicsRectWidget;
      button2->setZValue(1);
      button3->setZValue(2);
      button4->setZValue(3);
      QGraphicsScene scene(0, 0, 300, 300);
      scene.setBackgroundBrush(Qt::black);
      scene.addItem(button1);
      scene.addItem(button2);
      scene.addItem(button3);
      scene.addItem(button4);
      GraphicsView window(&scene);
      window.setFrameStyle(0);
      window.setAlignment(Qt::AlignLeft | Qt::AlignTop);
      window.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
      window.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
      QStateMachine machine;

      QState *group = new QState();
      group->setObjectName("group");
      QTimer timer;
      timer.setInterval(1250);
      timer.setSingleShot(true);
      QObject::connect(group, SIGNAL(entered()), &timer, SLOT(start()));

      QState *state1;
      QState *state2;
      QState *state3;
      QState *state4;
      QState *state5;
      QState *state6;
      QState *state7;

      state1 = createGeometryState(button1, QRect(100, 0, 50, 50),
                                   button2, QRect(150, 0, 50, 50),
                                   button3, QRect(200, 0, 50, 50),
                                   button4, QRect(250, 0, 50, 50),
                                   group);
      state2 = createGeometryState(button1, QRect(250, 100, 50, 50),
                                   button2, QRect(250, 150, 50, 50),
                                   button3, QRect(250, 200, 50, 50),
                                   button4, QRect(250, 250, 50, 50),
                                   group);
      state3 = createGeometryState(button1, QRect(150, 250, 50, 50),
                                   button2, QRect(100, 250, 50, 50),
                                   button3, QRect(50, 250, 50, 50),
                                   button4, QRect(0, 250, 50, 50),
                                   group);
      state4 = createGeometryState(button1, QRect(0, 150, 50, 50),
                                   button2, QRect(0, 100, 50, 50),
                                   button3, QRect(0, 50, 50, 50),
                                   button4, QRect(0, 0, 50, 50),
                                   group);
      state5 = createGeometryState(button1, QRect(100, 100, 50, 50),
                                   button2, QRect(150, 100, 50, 50),
                                   button3, QRect(100, 150, 50, 50),
                                   button4, QRect(150, 150, 50, 50),
                                   group);
      state6 = createGeometryState(button1, QRect(50, 50, 50, 50),
                                   button2, QRect(200, 50, 50, 50),
                                   button3, QRect(50, 200, 50, 50),
                                   button4, QRect(200, 200, 50, 50),
                                   group);
      state7 = createGeometryState(button1, QRect(0, 0, 50, 50),
                                   button2, QRect(250, 0, 50, 50),
                                   button3, QRect(0, 250, 50, 50),
                                   button4, QRect(250, 250, 50, 50),
                                   group);
      group->setInitialState(state1);

      QParallelAnimationGroup animationGroup;
      QSequentialAnimationGroup *subGroup;

      QPropertyAnimation *anim = new QPropertyAnimation(button4, "geometry");
      anim->setDuration(1000);
      anim->setEasingCurve(QEasingCurve::OutElastic);
      animationGroup.addAnimation(anim);

      subGroup = new QSequentialAnimationGroup(&animationGroup);
      subGroup->addPause(100);
      anim = new QPropertyAnimation(button3, "geometry");
      anim->setDuration(1000);
      anim->setEasingCurve(QEasingCurve::OutElastic);
      subGroup->addAnimation(anim);

      subGroup = new QSequentialAnimationGroup(&animationGroup);
      subGroup->addPause(150);
      anim = new QPropertyAnimation(button2, "geometry");
      anim->setDuration(1000);
      anim->setEasingCurve(QEasingCurve::OutElastic);
      subGroup->addAnimation(anim);

      subGroup = new QSequentialAnimationGroup(&animationGroup);
      subGroup->addPause(200);
      anim = new QPropertyAnimation(button1, "geometry");
      anim->setDuration(1000);
      anim->setEasingCurve(QEasingCurve::OutElastic);
      subGroup->addAnimation(anim);

      StateSwitcher *stateSwitcher = new StateSwitcher(&machine);
      stateSwitcher->setObjectName("stateSwitcher");
      group->addTransition(&timer, SIGNAL(timeout()), stateSwitcher);
      stateSwitcher->addState(state1, &animationGroup);
      stateSwitcher->addState(state2, &animationGroup);
      stateSwitcher->addState(state3, &animationGroup);
      stateSwitcher->addState(state4, &animationGroup);
      stateSwitcher->addState(state5, &animationGroup);
      stateSwitcher->addState(state6, &animationGroup);
      stateSwitcher->addState(state7, &animationGroup);

      machine.addState(group);
      machine.setInitialState(group);
      machine.start();

      window.resize(300, 300);
      window.show();

      qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

      return app.exec();
  }

  #include "main.moc"