# SoVRMLSwitch Class Reference
[VRML97 classes]

`#include <Inventor/VRMLnodes/SoVRMLSwitch.h>`

Inheritance diagram for SoVRMLSwitch:

List of all members.

## Detailed Description

The SoVRMLSwitch class is a group node for traversing selected children.

The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:

      Switch {
        exposedField    MFNode  choice      []
        exposedField    SFInt32 whichChoice -1    # [-1, inf)
      }

The Switch grouping node traverses zero or one of the nodes specified in the choice field. 4.6.5, Grouping and children nodes (<http://www.web3d.org/technicalinfo/specifications/vrml97/part1/concepts.html#4.6.5>), describes details on the types of nodes that are legal values for choice.

The whichChoice field specifies the index of the child to traverse, with the first child having index 0. If whichChoice is less than zero or greater than the number of nodes in the choice field, nothing is chosen. All nodes under a Switch continue to receive and send events regardless of the value of whichChoice. For example, if an active SoVRMLTimeSensor is contained within an inactive choice of an Switch, the SoVRMLTimeSensor sends events regardless of the Switch's state.

## Public Member Functions

| SoVRMLSwitch (void)
| SoVRMLSwitch (int choices)
virtual SbBool | affectsState (void) const
void | addChoice (SoNode *choice)
void | insertChoice (SoNode *choice, int idx)
SoNode * | getChoice (int idx) const
int | findChoice (SoNode *choice) const
int | getNumChoices (void) const
void | removeChoice (int idx)
void | removeChoice (SoNode *node)
void | removeAllChoices (void)
void | replaceChoice (int idx, SoNode *choice)
void | replaceChoice (SoNode *old, SoNode *choice)
virtual void | doAction (SoAction *action)
virtual void | callback (SoCallbackAction *action)
virtual void | GLRender (SoGLRenderAction *action)
virtual void | pick (SoPickAction *action)
virtual void | getBoundingBox (SoGetBoundingBoxAction *action)
virtual void | handleEvent (SoHandleEventAction *action)
virtual void | getMatrix (SoGetMatrixAction *action)
virtual void | search (SoSearchAction *action)
virtual void | write (SoWriteAction *action)
virtual void | audioRender (SoAudioRenderAction *action)
void | addChild (SoNode *child)
void | insertChild (SoNode *child, int idx)
SoNode * | getChild (int idx) const
int | findChild (const SoNode *child) const
int | getNumChildren (void) const
void | removeChild (int idx)
void | removeChild (SoNode *child)
void | removeAllChildren (void)
void | replaceChild (int idx, SoNode *node)
void | replaceChild (SoNode *old, SoNode *node)
virtual SoChildList * | getChildren (void) const

## Static Public Member Functions

void | initClass (void)

## Public Attributes

SoMFNode | choice
SoSFInt32 | whichChoice

## Protected Member Functions

virtual | ~SoVRMLSwitch (void)
virtual void | notify (SoNotList *list)
virtual SbBool | readInstance (SoInput *in, unsigned short flags)
virtual void | copyContents (const SoFieldContainer *from, SbBool copyConn)

## Friends

class | SoVRMLSwitchP

## Constructor & Destructor Documentation

SoVRMLSwitch::SoVRMLSwitch | ( | void |  | ) |

| Constructor.

SoVRMLSwitch::SoVRMLSwitch | ( | int | choices | ) |

| Constructor. choices is the expected number of children.

SoVRMLSwitch::~SoVRMLSwitch | ( | void |  | ) | `[protected, virtual]`

| Destructor.

## Member Function Documentation

void SoVRMLSwitch::initClass | ( | void |  | ) | `[static]`

| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system. Reimplemented from SoGroup.

SbBool SoVRMLSwitch::affectsState | ( | void |  | ) | const`[virtual]`

Returns `TRUE` if the node could have any effect on the state during traversal.

If it returns `FALSE`, no data in the traversal-state will change from the pre-traversal state to the post-traversal state. The SoSeparator node will for instance return `FALSE`, as it pushes and pops the state before and after traversal of its children. All SoShape nodes will also return `FALSE`, as just pushing out geometry data to the rendering engine won't affect the actual rendering state.

The default method returns `TRUE`, on a "better safe than sorry" philosophy.

Reimplemented from SoNode.

void SoVRMLSwitch::addChoice | ( | SoNode * | choice | ) |

| Adds choice to the choice field.

void SoVRMLSwitch::insertChoice | ( | SoNode * | choice,
|  | int | idx
| ) |

| Inserts choice at index idx.

SoNode * SoVRMLSwitch::getChoice | ( | int | idx | ) | const

| Returns the choice at index idx.

int SoVRMLSwitch::findChoice | ( | SoNode * | choice | ) | const

| Finds the index for choice, or -1 if not found.

int SoVRMLSwitch::getNumChoices | ( | void |  | ) | const

| Returns the number of choices.

void SoVRMLSwitch::removeChoice | ( | int | idx | ) |

| Removes the choice at index idx.

void SoVRMLSwitch::removeChoice | ( | SoNode * | choice | ) |

| If choice is found, remove it.

void SoVRMLSwitch::removeAllChoices | ( | void |  | ) |

| Removes all choices.

void SoVRMLSwitch::replaceChoice | ( | int | idx,
|  | SoNode * | choice
| ) |

| Replace the choice at index idx with choice.

void SoVRMLSwitch::replaceChoice | ( | SoNode * | old,
|  | SoNode * | choice
| ) |

| Find old, and replace it with choice.

void SoVRMLSwitch::doAction | ( | SoAction * | action | ) | `[virtual]`

| This function performs the typical operation of a node for any action. Reimplemented from SoGroup.

void SoVRMLSwitch::callback | ( | SoCallbackAction * | action | ) | `[virtual]`

| Action method for SoCallbackAction. Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph. Reimplemented from SoGroup.

void SoVRMLSwitch::GLRender | ( | SoGLRenderAction * | action | ) | `[virtual]`

| Action method for the SoGLRenderAction. This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method. Reimplemented from SoGroup.

void SoVRMLSwitch::pick | ( | SoPickAction * | action | ) | `[virtual]`

| Action method for SoPickAction. Does common processing for SoPickAction action instances. Reimplemented from SoGroup.

void SoVRMLSwitch::getBoundingBox | ( | SoGetBoundingBoxAction * | action | ) | `[virtual]`

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoGroup.

void SoVRMLSwitch::handleEvent | ( | SoHandleEventAction * | action | ) | `[virtual]`

| Action method for SoHandleEventAction. Inspects the event data from action, and processes it if it is something which this node should react to. Nodes influencing relevant state variables for how event handling is done also overrides this method. Reimplemented from SoGroup.

void SoVRMLSwitch::getMatrix | ( | SoGetMatrixAction * | action | ) | `[virtual]`

| Action method for SoGetMatrixAction. Updates action by accumulating with the transformation matrix of this node (if any). Reimplemented from SoGroup.

void SoVRMLSwitch::search | ( | SoSearchAction * | action | ) | `[virtual]`

Action method for SoSearchAction.

Compares the search criteria from the action to see if this node is a match. Searching is done by matching up all criteria set up in the SoSearchAction -- if any of the requested criteria is a miss, the search is not deemed successful for the node.

See also:
  SoSearchAction

Reimplemented from SoGroup.

void SoVRMLSwitch::write | ( | SoWriteAction * | action | ) | `[virtual]`

| Action method for SoWriteAction. Writes out a node object, and any connected nodes, engines etc, if necessary. Reimplemented from SoGroup.

void SoVRMLSwitch::audioRender | ( | SoAudioRenderAction * | action | ) | `[virtual]`

| Action method for SoAudioRenderAction. Does common processing for SoAudioRenderAction action instances. Reimplemented from SoGroup.

void SoVRMLSwitch::addChild | ( | SoNode * | child | ) | `[virtual]`

| Append a child node to the list of children nodes this group node is managing. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

void SoVRMLSwitch::insertChild | ( | SoNode * | child,
|  | int | idx
| ) | `[virtual]`

| Insert a child node at position newchildindex. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

SoNode * SoVRMLSwitch::getChild | ( | int | idx | ) | const`[virtual]`

| Returns pointer to child node at index. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

int SoVRMLSwitch::findChild | ( | const SoNode * | child | ) | const`[virtual]`

| Returns index in our list of children for child node, or -1 if node is not a child of this group node. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

int SoVRMLSwitch::getNumChildren | ( | void |  | ) | const`[virtual]`

| Returns number of child nodes managed by this group. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

void SoVRMLSwitch::removeChild | ( | int | idx | ) | `[virtual]`

| Remove node at childindex in our list of children. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

void SoVRMLSwitch::removeChild | ( | SoNode * | child | ) | `[virtual]`

| Remove child from the set of children managed by this group node. Will decrease the reference count of child by 1. This is a convenience method. It will simply call findChild() with child as argument, and then call removeChild(int) if the child is found. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

void SoVRMLSwitch::removeAllChildren | ( | void |  | ) | `[virtual]`

| Do not manage the children anymore. Will dereference all children by 1 as they are removed. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

void SoVRMLSwitch::replaceChild | ( | int | idx,
|  | SoNode * | child
| ) | `[virtual]`

| Replace child at index with newChild. Dereferences the child previously at index, and increases the reference count of newChild by 1. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

void SoVRMLSwitch::replaceChild | ( | SoNode * | old,
|  | SoNode * | child
| ) | `[virtual]`

| Replace oldchild with newchild. Dereferences oldchild by 1, and increases the reference count of newchild by 1. This is a convenience method. It will simply call findChild() with oldchild as argument, and call replaceChild(int, SoNode*) if the child is found. Please note that this method is not virtual in the original SGI Inventor API. Reimplemented from SoGroup.

SoChildList * SoVRMLSwitch::getChildren | ( | void |  | ) | const`[virtual]`

| Returns list of children. Reimplemented from SoGroup.

void SoVRMLSwitch::notify | ( | SoNotList * | list | ) | `[protected, virtual]`

| Notifies all auditors for this instance when changes are made. Reimplemented from SoNode.

SbBool SoVRMLSwitch::readInstance | ( | SoInput * | in,
|  | unsigned short | flags
| ) | `[protected, virtual]`

This method is mainly intended for internal use during file import operations.

It reads a definition of an instance from the input stream in. The input stream state points to the start of a serialized / persistant representation of an instance of this class type.

`TRUE` or `FALSE` is returned, depending on if the instantiation and configuration of the new object of this class type went ok or not. The import process should be robust and handle corrupted input streams by returning `FALSE`.

flags is used internally during binary import when reading user extension nodes, group nodes or engines.

Reimplemented from SoGroup.

void SoVRMLSwitch::copyContents | ( | const SoFieldContainer * | from,
|  | SbBool | copyConn
| ) | `[protected, virtual]`

Makes a deep copy of all data of from into this instance, except external scenegraph references if copyconnections is `FALSE`.

This is the protected method that should be overridden by extension node / engine / dragger / whatever subclasses which needs to account for internal data that are not handled automatically.

Note that for simply copying e.g. a node from application code, it should be sufficient to do:

      SoNode * mynewnode = templatenode->copy();

Make sure that when you override the copyContents() method in your extension class that you also make it call upwards to it's parent superclass in the inheritance hierarchy, as copyContents() in for instance SoNode and SoFieldContainer does important work. It should go something like this:

      void
      MyCoinExtensionNode::copyContents(const SoFieldContainer * from,
                                        SbBool copyconnections)
      {
        // let parent superclasses do their thing (copy fields, copy
        // instance name, etc etc)
        SoNode::copyContents(from, copyconnections);

        // [..then copy internal data..]
      }

Reimplemented from SoGroup.

## Member Data Documentation

SoMFNode SoVRMLSwitch::choice

| Contains the children.

SoSFInt32 SoVRMLSwitch::whichChoice

| Selected choice. Can be a positive number from 0 to <num children-1>, or one of the constants SO_SWITCH_NODE, SO_SWITCH_ALL or SO_SWITCH_INHERIT. Default value is SO_SWITCH_NONE.

The documentation for this class was generated from the following files:

- SoVRMLSwitch.h
- Switch.cpp