states.h Example File

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  #ifndef STATES_H
  #define STATES_H

  //Qt
  #include <QtCore/QState>
  #include <QtCore/QSignalTransition>
  #include <QtCore/QPropertyAnimation>
  #include <QtWidgets/QKeyEventTransition>
  #include <QtCore/QSet>

  class GraphicsScene;
  class Boat;
  class SubMarine;
  class QStateMachine;

  class PlayState : public QState
  {
  public:
      explicit PlayState(GraphicsScene *scene, QState *parent = 0);
      ~PlayState();

   protected:
      void onEntry(QEvent *) override;

  private :
      GraphicsScene *scene;
      QStateMachine *machine;
      int currentLevel;
      int score;

      friend class UpdateScoreState;
      friend class UpdateScoreTransition;
      friend class WinTransition;
      friend class CustomSpaceTransition;
      friend class WinState;
      friend class LostState;
      friend class LevelState;
  };

  class LevelState : public QState
  {
  public:
      LevelState(GraphicsScene *scene, PlayState *game, QState *parent = 0);
  protected:
      void onEntry(QEvent *) override;
  private :
      void initializeLevel();
      GraphicsScene *scene;
      PlayState *game;
  };

  class PauseState : public QState
  {
  public:
      explicit PauseState(GraphicsScene *scene, QState *parent = 0);

  protected:
      void onEntry(QEvent *) override;
      void onExit(QEvent *) override;
  private :
      GraphicsScene *scene;
  };

  class LostState : public QState
  {
  public:
      LostState(GraphicsScene *scene, PlayState *game, QState *parent = 0);

  protected:
      void onEntry(QEvent *) override;
      void onExit(QEvent *) override;
  private :
      GraphicsScene *scene;
      PlayState *game;
  };

  class WinState : public QState
  {
  public:
      WinState(GraphicsScene *scene, PlayState *game, QState *parent = 0);

  protected:
      void onEntry(QEvent *) override;
      void onExit(QEvent *) override;
  private :
      GraphicsScene *scene;
      PlayState *game;
  };

  class UpdateScoreState : public QState
  {
  public:
      UpdateScoreState(QState *parent);
  private:
  };

  //These transtion is used to update the score
  class UpdateScoreTransition : public QSignalTransition
  {
  public:
      UpdateScoreTransition(GraphicsScene *scene, PlayState *game, QAbstractState *target);
  protected:
      bool eventTest(QEvent *event) override;
  private:
      PlayState * game;
      GraphicsScene *scene;
  };

  //These transtion test if we have won the game
  class WinTransition : public QSignalTransition
  {
  public:
      WinTransition(GraphicsScene *scene, PlayState *game, QAbstractState *target);
  protected:
      bool eventTest(QEvent *event) override;
  private:
      PlayState * game;
      GraphicsScene *scene;
  };

  //These transtion is true if one level has been completed and the player want to continue
   class CustomSpaceTransition : public QKeyEventTransition
  {
  public:
      CustomSpaceTransition(QWidget *widget, PlayState *game, QEvent::Type type, int key);
  protected:
      bool eventTest(QEvent *event) override;
  private:
      PlayState *game;
  };

  #endif // STATES_H