DefaultEventHandler.hpp

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#ifndef DART_GUI_OSG_DEFAULTEVENTHANDLER_HPP_
#define DART_GUI_OSG_DEFAULTEVENTHANDLER_HPP_
 
#include <vector>
#include <array>
#include <memory>
 
#include <Eigen/Core>
 
#include <osgGA/GUIEventHandler>
 
#include "dart/common/Subject.hpp"
#include "dart/common/Observer.hpp"
 
namespace dart {
 
namespace dynamics {
class Shape;
class ShapeFrame;
class Entity;
} // dynamics
 
namespace gui {
namespace osg {
 
struct PickInfo
{
  dart::dynamics::ShapeFrame* frame;
  std::shared_ptr<dart::dynamics::Shape> shape;
  Eigen::Vector3d position;
  Eigen::Vector3d normal;
};
 
class Viewer;
 
enum MouseButton {
 
  LEFT_MOUSE = 0,
  RIGHT_MOUSE,
  MIDDLE_MOUSE,
 
  NUM_MOUSE_BUTTONS
};
 
enum MouseButtonEvent {
 
  BUTTON_PUSH = 0,
  BUTTON_DRAG,
  BUTTON_RELEASE,
  BUTTON_NOTHING
 
};
 
enum ConstraintType {
 
  UNCONSTRAINED = 0,
  LINE_CONSTRAINT,
  PLANE_CONSTRAINT,
  CUSTOM_CONSTRAINT,
 
  NUM_CONSTRAINT_TYPES
};
 
class MouseEventHandler;
 
class DefaultEventHandler : public ::osgGA::GUIEventHandler,
                            public virtual dart::common::Subject,
                            public virtual dart::common::Observer
{
public:
 
  explicit DefaultEventHandler(Viewer* _viewer);
 
  virtual ~DefaultEventHandler();
 
  MouseButtonEvent getButtonEvent(MouseButton button) const;
 
  int getModKeyMask() const;
 
  double getWindowCursorX() const;
 
  double getWindowCursorY() const;
 
  Eigen::Vector3d getDeltaCursor(const Eigen::Vector3d& _fromPosition,
                                 ConstraintType _constraint=UNCONSTRAINED,
                                 const Eigen::Vector3d& _constraintVector =
                                                Eigen::Vector3d::UnitZ()) const;
 
  void getNearAndFarPointUnderCursor(Eigen::Vector3d& near,
                                     Eigen::Vector3d& far,
                                     double distance=1.0) const;
 
  const std::vector<PickInfo>& getButtonPicks(MouseButton button,
                                              MouseButtonEvent event) const;
 
  const std::vector<PickInfo>& getMovePicks() const;
 
  void suppressButtonPicks(MouseButton button, MouseButtonEvent event);
 
  void suppressMovePicks();
 
  void activateButtonPicks(MouseButton button, MouseButtonEvent event);
 
  void activateMovePicks();
 
  void pick(std::vector<PickInfo>& infoVector,
            const ::osgGA::GUIEventAdapter& ea);
 
  void addMouseEventHandler(MouseEventHandler* handler);
 
  const std::set<MouseEventHandler*>& getMouseEventHandlers() const;
 
  bool handle(const ::osgGA::GUIEventAdapter& ea,
              ::osgGA::GUIActionAdapter&) override;
 
protected:
 
  void triggerMouseEventHandlers();
 
  void eventPick(const ::osgGA::GUIEventAdapter& ea);
 
  void clearButtonEvents();
 
  void handleDestructionNotification(
      const dart::common::Subject* _subject) override;
 
  Viewer* mViewer;
 
  std::set<MouseEventHandler*> mMouseEventHandlers;
 
  std::vector<PickInfo> mButtonPicks[NUM_MOUSE_BUTTONS][BUTTON_NOTHING];
 
  bool mSuppressButtonPicks[NUM_MOUSE_BUTTONS][BUTTON_NOTHING];
 
  std::vector<PickInfo> mMovePicks;
 
  bool mSuppressMovePicks;
 
  std::vector<PickInfo> mTempPicks;
 
  MouseButtonEvent mLastButtonEvent[NUM_MOUSE_BUTTONS];
 
  Eigen::Vector2d mLastCursorPosition;
 
  int mLastModKeyMask;
 
};
 
} // namespace osg
} // namespace gui
} // namespace dart
 
#endif // DART_GUI_OSG_DEFAULTEVENTHANDLER_HPP_