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| enum   | Message { kActiveListModified
 } | 
|   | Message types supported by the addCallback method.  More...
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| enum   | Action { kDefaultAction, 
kDoNotDoAction, 
kDoAction
 } | 
|   | Callback result action codes.  More...
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| typedef void(*  | MBasicFunction) (void *clientData) | 
|   | Pointer to a basic callback function.  More...
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| typedef void(*  | MElapsedTimeFunction) (float elapsedTime, float lastTime, void *clientData) | 
|   | Pointer to an elapsed time callback function.  More...
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| typedef void(*  | MCheckFunction) (bool *retCode, void *clientData) | 
|   | Pointer to callback function which returns a true/false result.  More...
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| typedef void(*  | MCheckFileFunction) (bool *retCode, MFileObject &file, void *clientData) | 
|   | Pointer to a callback function which takes a file object and returns a result.  More...
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| typedef void(*  | MCheckPlugFunction) (bool *retCode, MPlug &plug, void *clientData) | 
|   | Pointer to a callback function which takes a plug and returns a result.  More...
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| typedef void(*  | MComponentFunction) (MUintArray componentIds[], unsigned int count, void *clientData) | 
|   | Pointer to a callback function which takes an array of component ids.  More...
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| typedef void(*  | MNodeFunction) (MObject &node, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node.  More...
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| typedef void(*  | MStringFunction) (const MString &str, void *clientData) | 
|   | Pointer to callback function which takes a string.  More...
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| typedef void(*  | MTwoStringFunction) (const MString &str1, const MString &str2, void *clientData) | 
|   | Pointer to a callback function which takes two strings.  More...
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| typedef void(*  | MThreeStringFunction) (const MString &str1, const MString &str2, const MString &str3, void *clientData) | 
|   | Pointer to a callback function which takes three strings.  More...
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| typedef void(*  | MStringIntBoolIntFunction) (const MString &str, unsigned int index, bool flag, unsigned int type, void *clientData) | 
|   | Pointer to callback function which takes a string, an index, a flag and a type.  More...
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| typedef void(*  | MStringIndexFunction) (const MString &, unsigned int index, void *clientData) | 
|   | Pointer to callback function which takes a string and index.  More...
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| typedef void(*  | MNodeStringBoolFunction) (MObject &node, const MString &, bool, void *clientData) | 
|   | Pointer to a callback function which takes a node, a string and a boolean.  More...
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| typedef void(*  | MStateFunction) (bool state, void *clientData) | 
|   | Pointer to a callback function which takes a boolean state.  More...
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| typedef void(*  | MTimeFunction) (MTime &time, void *clientData) | 
|   | Pointer to callback function which takes a time.  More...
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| typedef void(*  | MPlugFunction) (MPlug &srcPlug, MPlug &destPlug, bool made, void *clientData) | 
|   | Pointer to plug connection callback function.  More...
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| typedef void(*  | MNodePlugFunction) (MObject &node, MPlug &plug, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node and a plug.  More...
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| typedef void(*  | MNodeStringFunction) (MObject &node, const MString &str, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node and a string.  More...
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| typedef void(*  | MParentChildFunction) (MDagPath &child, MDagPath &parent, void *clientData) | 
|   | Pointer to to a callback function which takes two DAG nodes in a parent/child relationship.  More...
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| typedef void(*  | MModifierFunction) (MDGModifier &modifier, void *clientData) | 
|   | Pointer to a callback function which takes a DG modifier.  More...
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| typedef void(*  | MStringArrayFunction) (const MStringArray &strs, void *clientData) | 
|   | Pointer to a callback function which takes a string array.  More...
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| typedef void(*  | MNodeModifierFunction) (MObject &node, MDGModifier &modifier, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node and a DG modifier.  More...
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| typedef void(*  | MObjArray) (MObjectArray &objects, void *clientData) | 
|   | Pointer to a callback function which takes an array of objects.  More...
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| typedef void(*  | MNodeObjArray) (MObject &node, MObjectArray &objects, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node and an array of objects.  More...
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| typedef void(*  | MStringNode) (const MString &str, MObject &node, void *clientData) | 
|   | Pointer to a callback function which takes a string and a dependency node.  More...
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| typedef void(*  | MCameraLayerFunction) (MObject &cameraSetNode, unsigned int multiIndex, bool added, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node, an unsigned integer, and a boolean value.  More...
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| typedef void(*  | MCameraLayerCameraFunction) (MObject &cameraSetNode, unsigned int multiIndex, MObject &oldCamera, MObject &newCamera, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node, an unsigned integer, and two camera transform nodes.  More...
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| typedef void(*  | MConnFailFunction) (MPlug &srcPlug, MPlug &destPlug, const MString &srcPlugName, const MString &dstPlugName, void *clientData) | 
|   | Pointer to connection-failed callback function.  More...
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| typedef void(*  | MPlugsDGModFunction) (MPlugArray &plugs, MDGModifier &modifier, void *clientData) | 
|   | Pointer to a callback function which takes an array of MPlugs and an MDGModifier.  More...
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| typedef void(*  | MNodeUuidFunction) (MObject &node, const MUuid &uuid, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node and a UUID.  More...
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| typedef Action(*  | MCheckNodeUuidFunction) (bool doAction, MObject &node, MUuid &uuid, void *clientData) | 
|   | Pointer to a callback function which takes a dependency node and a UUID, and returns a result.  More...
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| typedef void(*  | MObjectFileFunction) (const MObject &object, const MFileObject &file, void *clientData) | 
|   | Pointer to a callback function which takes an object and a file object.  More...
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| typedef void(*  | MCheckObjectFileFunction) (bool *retCode, const MObject &referenceNode, MFileObject &file, void *clientData) | 
|   | Pointer to a callback function which takes an object and a file object and returns a result.  More...
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| typedef void(*  | MRenderTileFunction) (int originX, int originY, int tileMaxX, int tileMaxY, const void *tileData) | 
|   | Pointer to a callback function which receives origin, size and image data.  More...
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| static MCallbackId  | addCallback (Message, MMessage::MBasicFunction, void *clientData=NULL, MStatus *ReturnStatus=NULL) | 
|   | Adds a new callback for the specified model message.  More...
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| static MCallbackId  | addBeforeDuplicateCallback (MMessage::MBasicFunction, void *clientData=NULL, MStatus *ReturnStatus=NULL) | 
|   | Before duplicate callback.  More...
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| static MCallbackId  | addAfterDuplicateCallback (MMessage::MBasicFunction, void *clientData=NULL, MStatus *ReturnStatus=NULL) | 
|   | After duplicate callback.  More...
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| static MCallbackId  | addNodeAddedToModelCallback (const MObject &dagNode, MMessage::MNodeFunction, void *clientData=NULL, MStatus *ReturnStatus=NULL) | 
|   | Node added to model message.  More...
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| static MCallbackId  | addNodeRemovedFromModelCallback (const MObject &dagNode, MMessage::MNodeFunction, void *clientData=NULL, MStatus *ReturnStatus=NULL) | 
|   | Node removed from model message.  More...
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| static const char *  | className () | 
|   | Returns the name of this class.  More...
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| static MStatus  | removeCallback (MCallbackId id) | 
|   | Remove the specified callback from maya.  More...
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| static MStatus  | removeCallbacks (MCallbackIdArray &ids) | 
|   | Remove all of the specified callbacks from maya.  More...
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| static MCallbackId  | currentCallbackId (MStatus *ReturnStatus=NULL) | 
|   | Return the callback ID of the currently executing callback.  More...
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| static MStatus  | nodeCallbacks (MObject &node, MCallbackIdArray &ids) | 
|   | Returns a list of callback IDs associated registered to a given node.  More...
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static void  | setRegisteringCallableScript () | 
|   | Mark this MMessage object as one that will be passed callbacks defined in script. 
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static bool  | registeringCallableScript () | 
|   | Return true if this MMessage object has its callbacks defined in script. 
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| static void  | stopRegisteringCallableScript () | 
|   | Stop this MMessage object from being passed.  More...
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| static const char *  | className () | 
|   | Returns the name of this class.  More...
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| static MStatus  | removeCallbacks (MIntArray &ids) | 
|   | This method is obsolete.  More...
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| static MStatus  | nodeCallbacks (MObject &node, MIntArray &ids) | 
|   | This method is obsolete.  More...
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|   | 
Scene messages. 
This class is used to register callbacks for model related messages.
The addCallback method registers a function that will be executed whenever the specified message occurs. An id is returned and 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.