SoHandleEventAction.h

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**=======================================================================*/
/*=======================================================================
** Author      : Paul S. Strauss (MMM yyyy)
**=======================================================================*/
/*=======================================================================
 *** THE CONTENT OF THIS WORK IS PROPRIETARY TO FEI S.A.S, (FEI S.A.S.),            ***
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_HANDLE_EVENT_ACTION_
#define  _SO_HANDLE_EVENT_ACTION_
 
#include <Inventor/SbViewportRegion.h>
#include <Inventor/actions/SoSubAction.h>
#include <Inventor/actions/SoRayPickAction.h>
 
class SoEvent;
class SoPickedPoint;
 
//
//  Class: SoHandleEventAction
//
//  Event handling action. This traverses a graph looking for a node
//  or nodes interested in a particular event.
//
 
class  SoHandleEventAction : public SoAction {
 
  SO_ACTION_HEADER(SoHandleEventAction);
 
 public:
  SoHandleEventAction(const SbViewportRegion &viewportRegion);
 
  // Destructor
#ifndef HIDDEN_FROM_DOC
  virtual ~SoHandleEventAction();
#endif // HIDDEN_FROM_DOC
 
  void                setViewportRegion(const SbViewportRegion &newRegion);
 
 
  const SbViewportRegion &getViewportRegion() const   { return vpRegion; }
 
  virtual void clearApplyResult();
 
  void                setEvent(const SoEvent *ev)     { event = ev; }
  const SoEvent *     getEvent() const                { return event; }
 
  void                setHandled()            { setTerminated(TRUE); }
  SbBool              isHandled() const       { return hasTerminated(); }
 
  void                setGrabber(SoNode *node);
  void                releaseGrabber()            { setGrabber(NULL); }
  SoNode *            getGrabber() const          { return eventGrabber; }
 
  void                setPickRoot(SoNode *node);
  SoNode *            getPickRoot() const             { return pickRoot; }
 
  void                setPickRadius(float radiusInPixels) 
    { pickAct->setRadius(radiusInPixels); }
 
  float               getPickRadius() const
    { return pickAct->getRadius(); }
 
  void enableRadiusForTriangles(SbBool flag);
 
  const SoPickedPoint *getPickedPoint();
 
  const SoPickedPointList &getPickedPointList();
 
 private:
  void                setPickedPoint( SoPickedPoint *point = NULL );
 
 private:
  static void         initClass();
  static void         exitClass();
 
 private:
  // Initiates action on graph
  virtual void        beginTraversal(SoNode *node);
 
 private:
  const SoEvent       *event;         // Event being handled
  SoNode              *pickRoot;      // Root node for initiating picking
  SoPickedPoint       *pickedPoint;   // PickedPoint from last pick
  SbBool              pickValid;      // Whether last pick is still valid
  SbBool              usedPickAll;    // TRUE if last pick used pickAll=TRUE
  SoRayPickAction     *pickAct;       // Pick action
  SoNode              *eventGrabber;  // Event grabber - gets all events
  SbViewportRegion    vpRegion;       // Current viewport region
  SbBool              pickedPtSet;    // TRUE if picked pt was set by app
 
};
 
#endif /* _SO_HANDLE_EVENT_ACTION_ */