SoSFTrigger(3)

NAME
SoSFTrigger - The SoSFTrigger class is the 'void' class used for detecting field changes.

SYNOPSIS

#include <Inventor/fields/SoSFTrigger.h>

Inherits SoSField.

  Public Member Functions
virtual SoType getTypeId (void) const
virtual void copyFrom (const SoField &field)
const SoSFTrigger & operator= (const SoSFTrigger &field)
virtual SbBool isSame (const SoField &field) const
void setValue (void)
void getValue (void) const
int operator== (const SoSFTrigger &trigger) const
int operator!= (const SoSFTrigger &trigger) const
virtual void startNotify (void)
virtual void notify (SoNotList *l)
virtual void touch (void)
Public Member Functions inherited from SoSField
virtual ~SoSField ()
Public Member Functions inherited from SoField
virtual ~SoField ()
void setIgnored (SbBool ignore)
SbBool isIgnored (void) const
void setDefault (SbBool defaultVal)
SbBool isDefault (void) const
SbBool isOfType (const SoType type) const
void enableConnection (SbBool flag)
SbBool isConnectionEnabled (void) const
SbBool connectFrom (SoEngineOutput *master, SbBool notnotify=FALSE, SbBool append=FALSE)
SbBool appendConnection (SoEngineOutput *master, SbBool notnotify=FALSE)
void disconnect (SoEngineOutput *engineoutput)
SbBool isConnectedFromEngine (void) const
SbBool getConnectedEngine (SoEngineOutput *&master) const
SbBool connectFrom (SoField *master, SbBool notnotify=FALSE, SbBool append=FALSE)
SbBool appendConnection (SoField *master, SbBool notnotify=FALSE)
void disconnect (SoField *field)
SbBool isConnectedFromField (void) const
SbBool getConnectedField (SoField *&master) const
int getNumConnections (void) const
int getForwardConnections (SoFieldList &slavelist) const
int getConnections (SoFieldList &masterlist) const
void disconnect (void)
SbBool isConnected (void) const
void setContainer (SoFieldContainer *cont)
SoFieldContainer * getContainer (void) const
SbBool set (const char *valuestring)
void get (SbString &valuestring)
SbBool shouldWrite (void) const
SbBool enableNotify (SbBool on)
SbBool isNotifyEnabled (void) const
void addAuditor (void *f, SoNotRec::Type type)
void removeAuditor (void *f, SoNotRec::Type type)
int operator== (const SoField &f) const
int operator!= (const SoField &f) const
virtual void connectionStatusChanged (int numconnections)
SbBool isReadOnly (void) const
virtual void fixCopy (SbBool copyconnections)
virtual SbBool referencesCopy (void) const
void copyConnection (const SoField *fromfield)
virtual SbBool read (SoInput *input, const SbName &name)
virtual void write (SoOutput *out, const SbName &name) const
virtual void countWriteRefs (SoOutput *out) const
void setFieldType (int type)
int getFieldType (void) const
SbBool getDirty (void) const
void setDirty (SbBool dirty)
void evaluate (void) const

  Static Public Member Functions
static void * createInstance (void)
static SoType getClassTypeId (void)
static void initClass (void)
Static Public Member Functions inherited from SoSField
static void initClass (void)
static SoType getClassTypeId (void)
static void atexit_cleanup (void)
Static Public Member Functions inherited from SoField
static void initClass (void)
static void initClasses (void)
static void cleanupClass (void)
static SoType getClassTypeId (void)

  Additional Inherited Members
Public Types inherited from SoField
enum FieldType { NORMAL_FIELD = 0, EVENTIN_FIELD, EVENTOUT_FIELD, EXPOSED_FIELD }
Public Attributes inherited from SoField Protected Member Functions inherited from SoSField
SoSField (void)
Protected Member Functions inherited from SoField
SoField (void)
void valueChanged (SbBool resetdefault=TRUE)
virtual void evaluateConnection (void) const
virtual SbBool readConnection (SoInput *in)
virtual void writeConnection (SoOutput *out) const
SbBool isDestructing (void) const
virtual SoNotRec createNotRec (SoBase *cont)

Detailed Description

The SoSFTrigger class is the 'void' class used for detecting field changes. Connect this field to a master field (or engine output) to detect when the master field changes its value.

This is useful if you want to automatically trigger an update from the node or engine (or other field container) this field is part of whenever another field changes -- and you are not particularly interested in the actual value of the master field.

See also
    SoFieldSensor

Member Function Documentation

  void * SoSFTrigger::createInstance (void ) [static]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
 Creates a new instance of the class type corresponding to the SoType object.

  SoType SoSFTrigger::getClassTypeId (void ) [static]
This static method returns the SoType object associated with objects of this class.

  SoType SoSFTrigger::getTypeId (void ) const [virtual]
Returns the type identification of an object derived from a class inheriting SoField. This is used for runtime type checking and 'downward' casting.

Implements SoField.

  void SoSFTrigger::copyFrom (const SoField & f) [virtual]
Copy value(s) from f into this field. f must be of the same type as this field.

Implements SoField.

  SbBool SoSFTrigger::isSame (const SoField & f) const [virtual]
Check for equal type and value(s).

Implements SoField.

  void SoSFTrigger::initClass (void ) [static]
Internal method called upon initialization of the library (from SoDB::init()) to set up the type system.

  void SoSFTrigger::setValue (void )
This field class does not actually contain any value, so we just trigger an update by calling touch() within this method.

  void SoSFTrigger::getValue (void ) const
Field doesn't contain any value, so this method does nothing.

  int SoSFTrigger::operator== (const SoSFTrigger & trigger) const
Since SoSFTrigger fields doesn't have any value, they are all equal. So this method always returns TRUE.

  int SoSFTrigger::operator!= (const SoSFTrigger & trigger) const
Since SoSFTrigger fields doesn't have any value, they are all equal. So this method always returns FALSE.

  void SoSFTrigger::startNotify (void ) [virtual]
Trigger a notification sequence.

At the end of a notification sequence, all 'immediate' sensors (i.e. sensors set up with a zero priority) are triggered.

Reimplemented from SoField.

  void SoSFTrigger::notify (SoNotList * nlist) [virtual]
Notify auditors that this field has changed.

Reimplemented from SoField.

  void SoSFTrigger::touch (void ) [virtual]
Notify the field as well as the field's owner / container that it has been changed.

Touching a field which is part of any component (engine or node) in a scene graph will lead to a forced redraw. This is useful if you have been doing several updates to the field wrapped in a pair of enableNotify() calls to notify the field's auditors that its value has changed.

See also
    setValue(), enableNotify()

Reimplemented from SoField.

Author

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