Array builder for arrays in data blocks. More...

#include <MArrayDataBuilder.h>

Public Member Functions
	MArrayDataBuilder (MDataBlock , const MObject &attribute, unsigned int numElements, MStatus ReturnStatus=NULL)
	The class constructor receives an attribute object and the number of elements to allocate space for. More...

MDataHandle	addLast (MStatus *ReturnStatus=NULL)
	Adds a new element to the end of the array. More...

MDataHandle	addElement (unsigned int index, MStatus *ReturnStatus=NULL)
	Adds a new element to the array at the given index. More...

MArrayDataHandle	addLastArray (MStatus *ReturnStatus=NULL)
	Adds a new element to the end of the array. More...

MArrayDataHandle	addElementArray (unsigned int index, MStatus *ReturnStatus=NULL)
	Adds a new element to the array at the given index. More...

MStatus	removeElement (unsigned int index)
	Removes the specified element from the array. More...

unsigned int	elementCount (MStatus *ReturnStatus=NULL) const
	Returns the number of elements in the array. More...

MStatus	growArray (unsigned int amount)
	Grows the array storage by the given amount. More...

MStatus	setGrowSize (unsigned int size)
	Sets the grow size of the array. More...

	MArrayDataBuilder (const MArrayDataBuilder &other)
	Copy constructor. More...

MArrayDataBuilder &	operator= (const MArrayDataBuilder &other)
	Assignment operator. More...

	~MArrayDataBuilder ()
	Class destructor.

	MArrayDataBuilder (const MObject &attribute, unsigned int numElements, MStatus *ReturnStatus=NULL)
	This method is obsolete. More...

Static Public Member Functions
static const char *	className ()
	Returns the name of this class. More...

Friends
class	MArrayDataHandle

Detailed Description

Array builder for arrays in data blocks.

An MArrayDataBuilder is used to construct data for attributes/plugs that have an array of data. An array builder is used with an MArrayDataHandle for managing data.

Examples:: apiMeshShape/apiMeshShape.cpp, dynExprField/dynExprField.cpp, multiCurveNode/multiCurveNode.cpp, ownerEmitter/ownerEmitter.cpp, simpleEmitter/simpleEmitter.cpp, sweptEmitter/sweptEmitter.cpp, torusField/torusField.cpp, and weightListNode/weightListNode.cpp.

Constructor & Destructor Documentation

MArrayDataBuilder	(	MDataBlock *	block,
		const MObject &	attribute,
		unsigned int	numElements,
		MStatus *	ReturnStatus = `NULL`
	)

The class constructor receives an attribute object and the number of elements to allocate space for.

The MObject must be a multi attribute (i.e. a plug that is a composite of multiple element plugs). This is different, for example, from a single attribute of type kVectorArrayData, which would be passed through a single plug as a single lump of data. Common examples of a multi-plug are the worldMatrix attribute that is on all DAG nodes, or the position attribute on the particleShape node.

This class will also take as input the datablock that the builder belongs to. You must specify this datablock if you want your builder to support per-plug caching.

Parameters

[in]	block	the data block that the builder belongs to.
[in]	attribute	attribute for which we wish to build data
[in]	numElements	number of elements to allocate space for
[out]	ReturnStatus	result status code

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter object argument is invalid
MS::kFailure attribute pointer is NULL

MArrayDataBuilder ( const MArrayDataBuilder & other )

Copy constructor.

Parameters

[in] other The source object to copy from.

OPENMAYA_MAJOR_NAMESPACE_OPEN MArrayDataBuilder	(	const MObject &	attribute,
		unsigned int	numElements,
		MStatus *	ReturnStatus = `NULL`
	)

This method is obsolete.

[as of Maya 2019]

Deprecated:: Use the other constructor instead.

Parameters

[in]	attribute	attribute for which we wish to build data
[in]	numElements	number of elements to allocate space for
[out]	ReturnStatus	result status code

Member Function Documentation

MDataHandle addLast ( MStatus * ReturnStatus = NULL )

Adds a new element to the end of the array.

The index of the element will be the current highest index + 1.

Parameters

[out] ReturnStatus result status code

Returns: The handle for the new element

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

MDataHandle addElement	(	unsigned int	index,
		MStatus *	ReturnStatus = `NULL`
	)

Adds a new element to the array at the given index.

Parameters

[in]	index	the index at which we wish to add the new element
[out]	ReturnStatus	result status code

Returns: The handle for the new element

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

Examples:: apiMeshShape/apiMeshShape.cpp, dynExprField/dynExprField.cpp, ownerEmitter/ownerEmitter.cpp, simpleEmitter/simpleEmitter.cpp, sweptEmitter/sweptEmitter.cpp, torusField/torusField.cpp, and weightListNode/weightListNode.cpp.

MArrayDataHandle addLastArray ( MStatus * ReturnStatus = NULL )

Adds a new element to the end of the array.

The added element is also an array. The index of the element will the current highest index + 1.

Parameters

[out] ReturnStatus result status code

Returns: The handle for the new array element

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

MArrayDataHandle addElementArray	(	unsigned int	index,
		MStatus *	ReturnStatus = `NULL`
	)

Adds a new element to the array at the given index.

The added element is also an array.

Parameters

[in]	index	the index at which we wish to add the new element
[out]	ReturnStatus	result status code

Returns: The handle for the new array element

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

MStatus removeElement ( unsigned int index )

Removes the specified element from the array.

Parameters

[in] index the element of the array to remove

Returns: Result status code

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid or remove the remove failed.

unsigned int elementCount ( MStatus * ReturnStatus = NULL ) const

Returns the number of elements in the array.

Parameters

[out] ReturnStatus result status code

Returns: The number of elements

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

MStatus growArray ( unsigned int amount )

Grows the array storage by the given amount.

Parameters

[in] amount the amount to grow the array by

Returns: Result status code

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

MStatus setGrowSize ( unsigned int size )

Sets the grow size of the array.

As elements are added to the array, the builder will allocate memory in chunks. This method tells the builder how many elements to allocate each time it grows the array.

Parameters

[in] size the number of elements to allocate when growing the array

Returns: Result status code

Status Codes:

MS::kSuccess operation successful
MS::kFailure the object is invalid

MArrayDataBuilder & operator= ( const MArrayDataBuilder & other )

Assignment operator.

Parameters

[in] other The source object to copy from.

const char * className ( )

static

Returns the name of this class.

Returns: Name of this class.

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

MArrayDataBuilder.h
MArrayDataBuilder.cpp

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation