text: // Copyright 1996-2020 Cyberbotics Ltd.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /*
   * Description:  Class defining the Automaton scene
   */
  
  #ifndef AUTOMATON_SCENE_HPP
  #define AUTOMATON_SCENE_HPP
  
  #include <QtCore/QList>
  #include <QtWidgets/QGraphicsScene>
  
  class Model;
  class State;
  class StateRepresentation;
  class Transition;
  class TransitionRepresentation;
  class AutomatonObject;
  class AutomatonWidget;
  
  class AutomatonScene : public QGraphicsScene {
    Q_OBJECT
  
  public:
    explicit AutomatonScene(AutomatonWidget *automatonWidget);
    virtual ~AutomatonScene() {}
    StateRepresentation *findStateRepresentationFromState(State *s) const;
    TransitionRepresentation *findTransitionRepresentationFromTransition(Transition *t) const;
  
  public slots:
    void stateCreated(State *s);
    void stateDeleted(State *s);
    void transitionCreated(Transition *t);
    void transitionDeleted(Transition *t);
    void updateEnabled(bool enabled);
  
  private:
    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
  
    QGraphicsItem *findRepresentationFromAutomatonObject(AutomatonObject *o) const;
  
    Model *mModel;
    AutomatonWidget *mAutomatonWidget;
    QGraphicsLineItem *mTransitionCreationLine;
  };
  
  #endif
  