boat_p.h Example File

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  #ifndef BOAT_P_H
  #define BOAT_P_H

  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //

  //Own
  #include "bomb.h"
  #include "graphicsscene.h"

  // Qt
  #include <QtWidgets/QKeyEventTransition>

  static const int MAX_BOMB = 5;

  //These transtion test if we have to stop the boat (i.e current speed is 1)
  class KeyStopTransition : public QKeyEventTransition
  {
  public:
      KeyStopTransition(Boat *b, QEvent::Type t, int k)
      : QKeyEventTransition(b, t, k), boat(b)
      {
      }
  protected:
      bool eventTest(QEvent *event) override
      {
          if (!QKeyEventTransition::eventTest(event))
              return false;
          return (boat->currentSpeed() == 1);
      }
  private:
      Boat * boat;
  };

  //These transtion test if we have to move the boat (i.e current speed was 0 or another value)
   class KeyMoveTransition : public QKeyEventTransition
  {
  public:
      KeyMoveTransition(Boat *b, QEvent::Type t, int k)
      : QKeyEventTransition(b, t, k), boat(b), key(k)
      {
      }
  protected:
      bool eventTest(QEvent *event) override
      {
          if (!QKeyEventTransition::eventTest(event))
              return false;
          return (boat->currentSpeed() >= 0);
      }
      void onTransition(QEvent *) override
      {
          //We decrease the speed if needed
          if (key == Qt::Key_Left && boat->currentDirection() == Boat::Right)
              boat->setCurrentSpeed(boat->currentSpeed() - 1);
          else if (key == Qt::Key_Right && boat->currentDirection() == Boat::Left)
              boat->setCurrentSpeed(boat->currentSpeed() - 1);
          else if (boat->currentSpeed() < 3)
              boat->setCurrentSpeed(boat->currentSpeed() + 1);
          boat->updateBoatMovement();
      }
  private:
      Boat * boat;
      int key;
  };

  //This transition trigger the bombs launch
   class KeyLaunchTransition : public QKeyEventTransition
  {
  public:
      KeyLaunchTransition(Boat *boat, QEvent::Type type, int key)
      : QKeyEventTransition(boat, type, key), boat(boat)
      {
      }
  protected:
      bool eventTest(QEvent *event) override
      {
          if (!QKeyEventTransition::eventTest(event))
              return false;
          //We have enough bomb?
          return (boat->bombsLaunched() < MAX_BOMB);
      }
  private:
      Boat * boat;
  };

  //This state is describing when the boat is moving right
  class MoveStateRight : public QState
  {
  public:
      explicit MoveStateRight(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
      {
      }
  protected:
      void onEntry(QEvent *) override
      {
          boat->setCurrentDirection(Boat::Right);
          boat->updateBoatMovement();
      }
  private:
      Boat * boat;
  };

   //This state is describing when the boat is moving left
  class MoveStateLeft : public QState
  {
  public:
      explicit MoveStateLeft(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
      {
      }
  protected:
      void onEntry(QEvent *) override
      {
          boat->setCurrentDirection(Boat::Left);
          boat->updateBoatMovement();
      }
  private:
      Boat * boat;
  };

  //This state is describing when the boat is in a stand by position
  class StopState : public QState
  {
  public:
      explicit StopState(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
      {
      }
  protected:
      void onEntry(QEvent *) override
      {
          boat->setCurrentSpeed(0);
          boat->setCurrentDirection(Boat::None);
          boat->updateBoatMovement();
      }
  private:
      Boat * boat;
  };

  //This state is describing the launch of the torpedo on the right
  class LaunchStateRight : public QState
  {
  public:
      explicit LaunchStateRight(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
      {
      }
  protected:
      void onEntry(QEvent *) override
      {
          Bomb *b = new Bomb();
          b->setPos(boat->x()+boat->size().width(),boat->y());
          GraphicsScene *scene = static_cast<GraphicsScene *>(boat->scene());
          scene->addItem(b);
          b->launch(Bomb::Right);
          boat->setBombsLaunched(boat->bombsLaunched() + 1);
      }
  private:
      Boat * boat;
  };

  //This state is describing the launch of the torpedo on the left
  class LaunchStateLeft : public QState
  {
  public:
      explicit LaunchStateLeft(Boat *boat,QState *parent = 0) : QState(parent), boat(boat)
      {
      }
  protected:
      void onEntry(QEvent *) override
      {
          Bomb *b = new Bomb();
          b->setPos(boat->x() - b->size().width(), boat->y());
          GraphicsScene *scene = static_cast<GraphicsScene *>(boat->scene());
          scene->addItem(b);
          b->launch(Bomb::Left);
          boat->setBombsLaunched(boat->bombsLaunched() + 1);
      }
  private:
      Boat * boat;
  };

  #endif // BOAT_P_H