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