SoDataSensor(3)

NAME
SoDataSensor - The SoDataSensor class is the abstract base class for sensors monitoring changes in a scene graph.

SYNOPSIS

#include <Inventor/sensors/SoDataSensor.h>

Inherits SoDelayQueueSensor.

Inherited by SoFieldSensor, SoNodeSensor, and SoPathSensor.

  Public Member Functions
SoDataSensor (void)
SoDataSensor (SoSensorCB *func, void *data)
virtual ~SoDataSensor (void)
void setDeleteCallback (SoSensorCB *function, void *data=NULL)
SoNode * getTriggerNode (void) const
SoField * getTriggerField (void) const
SoPath * getTriggerPath (void) const
void setTriggerPathFlag (SbBool flag)
SbBool getTriggerPathFlag (void) const
SoNotRec::OperationType getTriggerOperationType (void) const
int getTriggerIndex (void) const
int getTriggerFieldNumIndices (void) const
SoNode * getTriggerGroupChild (void) const
SoNode * getTriggerReplacedGroupChild (void) const
virtual void trigger (void)
virtual void notify (SoNotList *l)
virtual void dyingReference (void)=0

  Protected Member Functions
void invokeDeleteCallback (void)

  Additional Inherited Members

Detailed Description

The SoDataSensor class is the abstract base class for sensors monitoring changes in a scene graph. If you need to know when a particular entity (as a field or a node) changes, subclasses of SoDataSensor can be used to monitor the entity and notify you when it changes.

Constructor & Destructor Documentation

  SoDataSensor::SoDataSensor (void)
Default constructor.

  SoDataSensor::SoDataSensor (SoSensorCB * func, void * data)
Constructor taking as parameters the sensor callback function and the userdata which will be passed to the callback.

See also
    setFunction(), setData()

  SoDataSensor::~SoDataSensor (void) [virtual]
Destructor.

Member Function Documentation

  void SoDataSensor::setDeleteCallback (SoSensorCB * function, void * data = NULL)
If an object monitored by a data sensor is deleted, the given callback function will be called with the given userdata.

The sensor priority setting does not affect the delete callback. It will be called immediately, before the object is deleted.

  SoNode * SoDataSensor::getTriggerNode (void) const
Returns a pointer to the node causing the sensor to trigger, or NULL if there was no such node.

NULL will also be returned for sensors which are not immediate sensors (i.e. with priority equal to 0), as the result could otherwise be misleading (non-immediate sensors could have been scheduled and rescheduled multiple times, so there wouldn't be a single node responsible for the sensor triggering).

The result is only valid within the scope of a trigger(), so if you need to use the pointer outside your sensor callback, you must store it.

See also
    getTriggerField()

  SoField * SoDataSensor::getTriggerField (void) const
Returns a pointer to the field causing the sensor to trigger, or NULL if the change didn't start at a field.

Only valid for immediate sensors (will return NULL otherwise), for the same reason as described for SoDataSensor::getTriggerNode().

The result is only valid within the scope of a trigger(), so if you need to use the pointer outside your sensor callback, you must store it.

  SoPath * SoDataSensor::getTriggerPath (void) const
Returns a pointer to the path from the node under the surveillance of this sensor (either directly or indirectly through a field watch) down to the node which caused the sensor to be triggered.

Will only work for immediate mode sensors, for the same reason explained under getTriggerNode().

The resulting path is only valid within the scope of trigger(), so if you need to use the path outside your sensor callback, you must store the pointer and call SoPath::ref() to avoid its destruction at the end of SoDataSensor::trigger().

  void SoDataSensor::setTriggerPathFlag (SbBool flag)
This flag indicates whether or not the path should be queried whenever a node triggers the data sensor.

This flag is provided because finding a node path through a scene graph is an expensive operation.

See also
    getTriggerPathFlag(), getTriggerPath()

  SbBool SoDataSensor::getTriggerPathFlag (void) const
Returns whether or not any node induced trigger operations will make the sensor find the path of the node which caused it.

See also
    setTriggerPathFlag(), getTriggerPath()

  SoNotRec::OperationType SoDataSensor::getTriggerOperationType (void) const
Returns the type of the scene graph operation on the node that caused the sensor to trigger.

See also
    getTriggerNode(), getTriggerField(), getTriggerGroupChild()

  int SoDataSensor::getTriggerIndex (void) const
Returns the index of the child node or value in the node or multifield that caused the sensor to trigger.

Please note that this method is an extension to the original SGI Inventor API.

See also
    getTriggerFieldNumIndices(), getTriggerGroupChild(), getTriggerNode(), getTriggerField()

  int SoDataSensor::getTriggerFieldNumIndices (void) const
Returns the number of indices of the multifield that caused the sensor to trigger.

Please note that this method is an extension to the original SGI Inventor API.

See also
    getTriggerIndex(), getTriggerField()

  SoNode * SoDataSensor::getTriggerGroupChild (void) const
Returns a pointer to the actual child node in the node that caused the sensor to trigger, or NULL if there was no such node.

Please note that this method is an extension to the original SGI Inventor API.

See also
    getTriggerNode(), getTriggerReplacedGroupChild

  SoNode * SoDataSensor::getTriggerReplacedGroupChild (void) const
Returns a pointer to the actual child node for a SoNotRec::GROUP_REPLACECHILD type of operation in the node that is about to be replaced and caused the sensor to trigger, or NULL if there was no such node.

Please note that this method is an extension to the original SGI Inventor API.

See also
    getTriggerNode(), getTriggerGroupChild

  void SoDataSensor::trigger (void) [virtual]
Trigger the sensor's callback function.

Reimplemented from SoDelayQueueSensor.

Reimplemented in SoFieldSensor.

  void SoDataSensor::notify (SoNotList * l) [virtual]
Called from entity we are monitoring when it changes.

If this is an immediate sensor, the field and node (if any) causing the change will be stored and can be fetched by getTriggerField() and getTriggerNode(). If the trigger path flag has been set, the path down to the node is also found and stored for later retrieval by getTriggerPath().

See also
    setTriggerPathFlag()

Reimplemented in SoPathSensor.

  void SoDataSensor::dyingReference (void) [pure virtual]
This method is called when the entity we are connected to is about to be deleted.

  void SoDataSensor::invokeDeleteCallback (void) [protected]
Runs the callback set in setDeleteCallback().

Called from subclasses when the entity we're monitoring is about to be deleted.

Author

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