FSM-Editor/FSMView.h at master · frederic-tingaud-sonarsource/FSM-Editor · GitHub

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#pragma  once

#include <QGraphicsView>
#include <QGraphicsScene>

/**
 * @brief A view on the FSMScene.
 *
 * Each scene can have multiple scenes. This class provides the main view
 * and handles camera move and zoom.
 */
class FSMView : public QGraphicsView
{
  Q_OBJECT;
  using super = QGraphicsView;
public:
  FSMView(QGraphicsScene* scene, QWidget* parent);

  /**
   * Zoom in, in the graph view.
   */
  Q_SLOT void zoomIn();
  /**
   * Zoom out, in the graph view.
   */
  Q_SLOT void zoomOut();
  /**
   * Called by the wheel events from the scene.
   */
  Q_SLOT void zoomView(int delta);

  /**
   * This method should only be useful to save and load the zoom between sessions.
   */
  qreal currentZoom() const;

  /**
  * This method should only be useful to save and load the zoom between sessions.
  */
  void setZoom(qreal zoom);
protected:
  virtual void keyPressEvent(QKeyEvent *event) override;

  virtual void keyReleaseEvent(QKeyEvent *event) override;

  virtual void drawBackground(QPainter * painter, const QRectF & rect) override;

  virtual void mousePressEvent(QMouseEvent *) override;

  virtual void mouseReleaseEvent(QMouseEvent *) override;

  /**
   * Switch between scroll mode and the default drag mode, which is RubberBandMode.
   */
  void setScrollMode(bool on);

  QMouseEvent* copyMouseEventLeft(QMouseEvent* e);
};