MDGMessage Class Reference
[OpenMaya - API module for common classes]

#include <MDGMessage.h>
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List of all members.


Detailed Description

Dependency graph messages.

This class is used to register callbacks for dependency graph messages.

There are 4 add callback methods which will add callbacks for the following messages

A filter can be specified for node added/removed messages. The default node type is "dependNode" which matches all nodes. Each method returns an id which is used to remove the callback.

To remove a callback use MMessage::removeCallback. All callbacks that are registered by a plug-in must be removed by that plug-in when it is unloaded. Failure to do so will result in a fatal error.


Static Public Member Functions

static MCallbackId  addTimeChangeCallback (MMessage::MTimeFunction func, void *clientData=NULL, MStatus *ReturnStatus=NULL)
static MCallbackId  addForceUpdateCallback (MMessage::MTimeFunction func, void *clientData=NULL, MStatus *ReturnStatus=NULL)
static MCallbackId  addNodeAddedCallback (MMessage::MNodeFunction func, const MString &nodeType="dependNode", void *clientData=NULL, MStatus *ReturnStatus=NULL)
static MCallbackId  addNodeRemovedCallback (MMessage::MNodeFunction func, const MString &nodeType="dependNode", void *clientData=NULL, MStatus *ReturnStatus=NULL)
static MCallbackId  addConnectionCallback (MMessage::MPlugFunction func, void *clientData=NULL, MStatus *ReturnStatus=NULL)
static MCallbackId  addPreConnectionCallback (MMessage::MPlugFunction func, void *clientData=NULL, MStatus *ReturnStatus=NULL)

Member Function Documentation

MCallbackId MDGMessage::addTimeChangeCallback ( MMessage::MTimeFunction  func,
void *  clientData = NULL,
MStatus ReturnStatus = NULL  
) [static]

This method registers a callback that is called whenever the time changes in the dependency graph.

Parameters:
[in]  func  the callback function
  • time the new time
  • clientData User defined data passed to the callback function
Parameters:
[in]  clientData  User defined data passed to the callback function
[out]  ReturnStatus  status code
Returns:
Identifier used for removing the callback.
Status Codes:

MCallbackId MDGMessage::addForceUpdateCallback ( MMessage::MTimeFunction  func,
void *  clientData = NULL,
MStatus ReturnStatus = NULL  
) [static]

This method registers a callback that is called after the time changes and after all nodes have been evaluated in the dependency graph.

Parameters:
[in]  func  the callback function
  • time the new time
  • clientData User defined data passed to the callback function
Parameters:
[in]  clientData  User defined data passed to the callback function
[out]  ReturnStatus  status code
Returns:
Identifier used for removing the callback.
Status Codes:

MCallbackId MDGMessage::addNodeAddedCallback ( MMessage::MNodeFunction  func,
const MString nodeType = "dependNode",
void *  clientData = NULL,
MStatus ReturnStatus = NULL  
) [static]

This method registers a callback that is called whenever a new node is added to the dependency graph. The nodeType argument allows you to specify the type of nodes that will trigger the callback. The default node type is "dependNode" which matches all nodes.

Parameters:
[in]  func  the callback function
  • node the new node
  • clientData User defined data passed to the callback function
Parameters:
[in]  nodeType  Type of node that will trigger the callback
[in]  clientData  User defined data passed to the callback function
[out]  ReturnStatus  status code
Returns:
Identifier used for removing the callback.
Status Codes:
Examples:

MCallbackId MDGMessage::addNodeRemovedCallback ( MMessage::MNodeFunction  func,
const MString nodeType = "dependNode",
void *  clientData = NULL,
MStatus ReturnStatus = NULL  
) [static]

This method registers a callback that is called whenever a new node is removed from the dependency graph. The nodeType argument allows you to specify the type of nodes that will trigger the callback. The default node type is "dependNode" which matches all nodes.

Parameters:
[in]  func  the callback function
  • node the node being removed
  • clientData User defined data passed to the callback function
Parameters:
[in]  nodeType  Type of node that will trigger the callback
[in]  clientData  User defined data passed to the callback function
[out]  ReturnStatus  status code
Returns:
Identifier used for removing the callback.
Status Codes:
Examples:

MCallbackId MDGMessage::addConnectionCallback ( MMessage::MPlugFunction  func,
void *  clientData = NULL,
MStatus ReturnStatus = NULL  
) [static]

This method registers a callback that is called whenever a connection is made or broken in the dependency graph. This callback is triggered after the given connection has been made or broken, unlike the addPreConnectionCallback which is triggered before the operation.

Parameters:
[in]  func  the callback function
  • srcPlug Source plug of the connection
  • destPlug Destination plug of the connection
  • made true if a new connection was made, false if broken.
  • clientData User defined data passed to the callback function
Parameters:
[in]  clientData  User defined data passed to the callback function
[out]  ReturnStatus  status code
Returns:
Identifier used for removing the callback.
Status Codes:

MCallbackId MDGMessage::addPreConnectionCallback ( MMessage::MPlugFunction  func,
void *  clientData = NULL,
MStatus ReturnStatus = NULL  
) [static]

This method registers a callback that is called whenever any connection is made or broken in the dependency graph. This callback is triggered before the given connection has been made or broken, unlike the addConnectionCallback which is triggered after the operation.

Parameters:
[in]  func  the callback function
  • srcPlug Source plug of the connection
  • destPlug Destination plug of the connection
  • made true if a new connection will be made, false if it will be broken.
  • clientData User defined data passed to the callback function
Parameters:
[in]  clientData  User defined data passed to the callback function
[out]  ReturnStatus  status code
Returns:
Identifier used for removing the callback.
Status Codes:

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