NAME

       SoSFTrigger -

       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.

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)

   Static Public Member Functions
       static void * createInstance (void)
       static SoType getClassTypeId (void)
       static void initClass (void)

   Additional Inherited Members

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

   SoType SoSFTrigger::getTypeId (void) const [virtual]
       Returns the type identification instance which uniquely identifies the Coin field class
       the object belongs to.

       See Also:
           getClassTypeId(), SoType

       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::setValue (void)
       This field class does not actually contain any value, so we just triggers 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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