C++ API Reference
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Expression function set. More...
#include <MFnExpression.h>
Public Types | |
enum | UnitConversion { kAll, kNone, kAngularOnly } |
Unit conversion modes. More... | |
Public Types inherited from MFnDependencyNode | |
enum | MAttrClass { kLocalDynamicAttr = 1, kNormalAttr, kExtensionAttr, kInvalidAttr } |
Specifies the scope of the attribute. More... | |
enum | MdgTimerState { kTimerOff, kTimerOn, kTimerUninitialized, kTimerInvalidState } |
Possible states for the node's timer. More... | |
enum | MdgTimerMetric { kTimerMetric_callback, kTimerMetric_compute, kTimerMetric_dirty, kTimerMetric_draw, kTimerMetric_fetch, kTimerMetric_callbackViaAPI, kTimerMetric_callbackNotViaAPI, kTimerMetric_computeDuringCallback, kTimerMetric_computeNotDuringCallback, kTimerMetrics } |
The different timer metrics which can be queried. More... | |
enum | MdgTimerType { kTimerType_self, kTimerType_inclusive, kTimerType_count, kTimerTypes } |
The types of timers which can be queried. More... | |
Public Member Functions | |
virtual MFn::Type | type () const |
Function set type. More... | |
virtual | ~MFnExpression () |
Destructor. | |
MFnExpression () | |
Default constructor. | |
MFnExpression (MObject &object, MStatus *ReturnStatus=NULL) | |
Constructor. More... | |
MObject | create (const MString &expression, MObject &object=MObject::kNullObj, MStatus *ReturnStatus=NULL) |
This method creates and returns a dependency node for a given expression. More... | |
MString | expression (MStatus *ReturnStatus=NULL) |
Gets the expression string for this expression node. More... | |
MStatus | setExpression (const MString &expression) |
Sets the expression string for this expression node. More... | |
MStatus | getDefaultObject (MObject &object) |
Gets the "default" object for the expression. More... | |
MStatus | setDefaultObject (MObject &object) |
Sets the "default" object for the expression. More... | |
bool | isAnimated (MStatus *ReturnStatus=NULL) |
If this is true, then the expression will be evaluated whenever time changes, regardless of whether the other inputs have changed. More... | |
MStatus | setAnimated (bool value=false) |
Sets the way in which the expression is evaluated. More... | |
MStatus | evaluate (MDoubleArray &result) |
Evaluate this expression and return the result. More... | |
UnitConversion | unitConversion (MStatus *ReturnStatus=NULL) const |
Get the unit conversion status for the expression node. More... | |
MStatus | setUnitConversion (UnitConversion conversion) |
Set the unit conversion options for the expression node. More... | |
MFnExpression (const MObject &object, MStatus *ReturnStatus=NULL) | |
Constructor. More... | |
MStatus | getExpression (MString &expression) |
NO SCRIPT SUPPORT. More... | |
Public Member Functions inherited from MFnDependencyNode | |
virtual | ~MFnDependencyNode () |
Destructor. | |
MFnDependencyNode () | |
Default constructor. | |
MFnDependencyNode (MObject &object, MStatus *ReturnStatus=NULL) | |
Constructor. More... | |
MObject | create (const MTypeId &typeId, MStatus *ReturnStatus=NULL) |
Creates a new dependency node with the given type tag. More... | |
MObject | create (const MTypeId &typeId, const MString &name, MStatus *ReturnStatus=NULL) |
Creates a new dependency node with the given type tag. More... | |
MObject | create (const MString &type, MStatus *ReturnStatus=NULL) |
Creates a new dependency node with the given type. More... | |
MObject | create (const MString &type, const MString &name, MStatus *ReturnStatus=NULL) |
Creates a new dependency node with the given type. More... | |
MTypeId | typeId (MStatus *ReturnStatus=NULL) const |
Returns the type id of this node. More... | |
MString | typeName (MStatus *ReturnStatus=NULL) const |
Returns the type name of this node. More... | |
MString | name (MStatus *ReturnStatus=NULL) const |
Returns the name of this node. More... | |
MString | absoluteName (MStatus *ReturnStatus=NULL) const |
Returns the absolute name of this node. More... | |
MString | uniqueName (MStatus *ReturnStatus=NULL) const |
Returns the unique name of this node. More... | |
MString | pluginName (MStatus *ReturnStatus=NULL) const |
Returns the name of the plug-in this MFnDependendencyNode was defined in. More... | |
MString | setName (const MString &name, bool createNamespace=false, MStatus *ReturnStatus=NULL) |
Sets the name of this node. More... | |
MUuid | uuid (MStatus *ReturnStatus=NULL) const |
Returns the node's UUID. More... | |
void | setUuid (const MUuid &uuid, MStatus *ReturnStatus=NULL) |
Sets the node's UUID. More... | |
MStatus | getConnections (MPlugArray &array) const |
Get all of the current connections to this node as an array of plugs. More... | |
unsigned int | attributeCount (MStatus *ReturnStatus=NULL) const |
Returns the number of attributes that this node has. More... | |
MObject | attribute (unsigned int index, MStatus *ReturnStatus=NULL) const |
Finds the attribute of this node at the given index. More... | |
MObject | reorderedAttribute (unsigned int index, MStatus *ReturnStatus=NULL) const |
Some nodes, such as the various animCurve nodes, require that their attributes be set in a specific order for proper operation. More... | |
MObject | attribute (const MString &attrName, MStatus *ReturnStatus=NULL) const |
Finds the attribute of this node that has the given name. More... | |
MAttrClass | attributeClass (const MObject &attr, MStatus *ReturnStatus=NULL) const |
Returns the class (normal, dynamic, extension) of the specified attribute. More... | |
MStatus | getAffectedAttributes (const MObject &attr, MObjectArray &affectedAttributes) const |
Returns an array of attributes that are affected by the attribute passed in. More... | |
MStatus | getAffectedByAttributes (const MObject &attr, MObjectArray &affectedByAttributes) const |
Returns an array of attributes that affect the attribute passed in, attr. More... | |
MPlug | findPlug (const MObject &attr, bool wantNetworkedPlug, MStatus *ReturnStatus=NULL) const |
Attempt to find a plug for the given attribute. More... | |
MPlug | findPlug (const MString &attrName, bool wantNetworkedPlug, MStatus *ReturnStatus=NULL) const |
Attempt to find a plug for the given attribute. More... | |
MPlug | findPlug (const MObject &attr, MStatus *ReturnStatus=NULL) const |
This method is obsolete. More... | |
MPlug | findPlug (const MString &attrName, MStatus *ReturnStatus=NULL) const |
This method is obsolete. More... | |
MStatus | addAttribute (const MObject &attr) |
Add a new dynamic attibute to this node. More... | |
MStatus | removeAttribute (const MObject &attr) |
Remove a dynamic attribute from a node. More... | |
MPxNode * | userNode (MStatus *ReturnStatus=NULL) const |
If the function set's node is a plug-in node, then this method will extract the MPxNode pointer from it. More... | |
bool | isFromReferencedFile (MStatus *ReturnStatus=NULL) const |
Indicates whether or not this node came from a referenced file. More... | |
bool | isShared (MStatus *ReturnStatus=NULL) const |
Indicates whether or not this node is shared. More... | |
bool | isTrackingEdits (MStatus *ReturnStatus=NULL) const |
Returns whether or not edits on the given node are being tracked by the generalized edit system. More... | |
bool | hasUniqueName (MStatus *ReturnStatus=NULL) const |
Indicates whether or not this node's name is unique within the scene. More... | |
MString | parentNamespace (MStatus *ReturnStatus=NULL) const |
Returns the name of the namespace in which this node resides. More... | |
bool | isLocked (MStatus *ReturnStatus=NULL) const |
Indicates whether or not this node is locked. More... | |
MStatus | setLocked (bool locked) |
Locks or unlocks this node. More... | |
bool | isNewAttribute (const MObject &attr, MStatus *ReturnStatus=NULL) const |
Indicates whether or not the specified attribute was added to this node within the current scene. More... | |
MStatus | setFlag (unsigned int flag, bool state) |
Sets the state of the specified flag for the node. More... | |
bool | isFlagSet (unsigned int flag, MStatus *ReturnStatus=NULL) const |
Retrieves the current state of the specified flag for a node. More... | |
bool | isDefaultNode (MStatus *ReturnStatus=NULL) const |
Returns true if the node is a default node. More... | |
MStatus | setDoNotWrite (bool flag) |
Use this method to mark the "do not write" state of this node. More... | |
bool | canBeWritten (MStatus *ReturnStatus=NULL) const |
Returns the do not write state of the node. More... | |
bool | hasAttribute (const MString &name, MStatus *ReturnStatus=NULL) const |
Returns true if the node already has an attribute with the given name. More... | |
MObject | getAliasAttr (bool force, MStatus *ReturnStatus=NULL) |
Returns the node's alias attribute, which is a special attribute used to store information about the node's attribute aliases. More... | |
bool | setAlias (const MString &alias, const MString &name, const MPlug &plug, bool add=true, MStatus *ReturnStatus=NULL) |
Sets or removes an alias (i.e. More... | |
bool | findAlias (const MString &alias, MObject &attrObj, MStatus *ReturnStatus=NULL) const |
Retrieves the attribute with the given alias. More... | |
bool | getAliasList (MStringArray &strArray, MStatus *ReturnStatus=NULL) |
Returns a list of all attribute aliases for this node. More... | |
MString | plugsAlias (const MPlug &plug, MStatus *ReturnStatus=NULL) |
Returns the alias for the plug's attribute or the empty string if that attribute has no alias. More... | |
MStatus | setIcon (const MString &filename) |
Associates a custom icon with the node for display in the Maya UI. More... | |
MString | icon (MStatus *ReturnStatus=NULL) const |
Returns the custom icon filename associated with the node. More... | |
MStatus | getExternalContent (MExternalContentInfoTable &table) const |
Returns the external content (files) that this node depends on. More... | |
MStatus | addExternalContentForFileAttr (MExternalContentInfoTable &table, const MObject &attr) const |
Adds content info to the specified table from a file path attribute. More... | |
MStatus | setExternalContentForFileAttr (const MObject &attr, const MExternalContentLocationTable &table) |
Sets content info in the specified attribute from the table. More... | |
MStatus | setExternalContent (const MExternalContentLocationTable &table) |
Changes the location of external content. More... | |
bool | affectsAnimation (MStatus *ReturnStatus=NULL) const |
Indicates whether or not this node is allowed to animate. More... | |
MStatus | setAffectsAnimation () |
Define a node can affect animation. More... | |
MString | setName (const MString &name, MStatus *ReturnStatus) |
This method is obsolete. More... | |
MFnDependencyNode (const MObject &object, MStatus *ReturnStatus=NULL) | |
This method is not available in Python. More... | |
bool | getPlugsAlias (const MPlug &plug, MString &aliasName, MStatus *ReturnStatus=NULL) |
This method is not available in Python. More... | |
virtual const adsk::Data::Associations * | metadata (MStatus *ReturnStatus=NULL) const |
This method is not available in Python. More... | |
virtual MStatus | setMetadata (const adsk::Data::Associations &) |
This method is not available in Python. More... | |
virtual MStatus | deleteMetadata () |
This method is not available in Python. More... | |
virtual MStatus | validateMetadata (MString &errors) const |
This method is not available in Python. More... | |
MStatus | dgTimerOn () |
Indicates that this node should collect DG timing data whenever DG timing is enabled. More... | |
MStatus | dgTimerOff () |
Indicates that this node should no longer collect DG timing data when DG timing is enabled. More... | |
MdgTimerState | dgTimerQueryState (MStatus *ReturnStatus=NULL) |
The function returns the current on/off state of the node's timer. More... | |
MStatus | dgTimerReset () |
The function resets the dependency graph timers and counters for this node to zero. More... | |
double | dgTimer (const MdgTimerMetric timerMetric, const MdgTimerType timerType, MStatus *ReturnStatus=NULL) const |
The function returns the specified timer value for the current node. More... | |
MStatus | dgCallbacks (const MdgTimerType type, MStringArray &callbackName, MDoubleArray &value) |
Node callbacks that occur when timing is enabled get logged with the node and can be queried via this method. More... | |
MStatus | dgCallbackIds (const MdgTimerType type, const MString &callbackName, MCallbackIdArray &callbackId, MDoubleArray &value) |
This method provides a further breakdown of the per-callback time returned via dgCallbacks() by returning the data on a per-callbackId basis. More... | |
MStatus | addAttribute (const MObject &attr, MAttrClass type) |
This method is obsolete. More... | |
MStatus | removeAttribute (const MObject &attr, MAttrClass type) |
This method is obsolete. More... | |
Public Member Functions inherited from MFnBase | |
virtual | ~MFnBase () |
Class Destructor. More... | |
bool | hasObj (MFn::Type) const |
Determines whether or not the Function Set is compatible with the specified Maya Object within the API RTTI system. More... | |
bool | hasObj (const MObject &) const |
Determines whether or not the Function Set is compatible with the specified Maya Object within the API RTTI system. More... | |
MObject | object (MStatus *ReturnStatus=nullptr) const |
Returns the MObject that is attached to the Function Set. More... | |
virtual MStatus | setObject (MObject &object) |
Attaches the Function Set to the specified Maya Object. More... | |
virtual MStatus | setObject (const MObject &object) |
NO SCRIPT SUPPORT. More... | |
Static Public Member Functions | |
static const char * | className () |
Returns the name of this class. More... | |
Static Public Member Functions inherited from MFnDependencyNode | |
static const char * | className () |
Returns the name of this class. More... | |
static MString | classification (const MString &nodeTypeName) |
Retrieves the classification string for a node type. More... | |
static unsigned int | allocateFlag (const MString pluginName, MStatus *ReturnStatus=NULL) |
Allocates a node flag for sole use by the caller. More... | |
static MStatus | deallocateFlag (const MString pluginName, unsigned int flag) |
Deallocates a node flag which was previously allocated by a call to allocateFlag. More... | |
static MStatus | deallocateAllFlags (const MString pluginName) |
Deallocates all of the node flags which are currently allocated to the specified plugin. More... | |
static void | enableDGTiming (bool enable) |
Globally enables or disables the DG node timing mechanism. More... | |
Static Public Member Functions inherited from MFnBase | |
static const char * | className () |
Returns the name of this class. More... | |
static const char * | typeString (MFn::Type) |
Returns the type string for a given type. More... | |
static bool | isValid (MFn::Type) |
Returns true if type is in the range of valid types. More... | |
Expression function set.
This class is used to create, edit, and query expression nodes.
enum UnitConversion |
MFnExpression | ( | MObject & | object, |
MStatus * | ReturnStatus = NULL |
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MFnExpression | ( | const MObject & | object, |
MStatus * | ReturnStatus = NULL |
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) |
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virtual |
Function set type.
Return the class type : MFn::kExpression.
Reimplemented from MFnDependencyNode.
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static |
Returns the name of this class.
Return the class name : "MFnExpression".
MObject create | ( | const MString & | expression, |
MObject & | object = MObject::kNullObj , |
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MStatus * | ReturnStatus = NULL |
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) |
This method creates and returns a dependency node for a given expression.
A default object can be specified, but if it is not specified in the expression string then the expression string values will be used.
If the expression string is of the form "objectName.attribute = ... " then the default object parameter is not needed. If you supply a default object in this case, then it will be ignored.
If the expression has no default object then you must supply one. For example, if the expression is of the form "attribute = ...", then you must supply a default object.
[in] | expression | The expression string |
[in] | object | The default object (optional - see above) |
[out] | ReturnStatus | Status code |
Gets the expression string for this expression node.
[out] | ReturnStatus | Status code. See below. |
Sets the expression string for this expression node.
[in] | expression | The expression string |
Gets the "default" object for the expression.
Not all expressions have a default object. If there is no default object for the expression, the object will be set to MObject::kNullObject and the return status will indicate success. This is a completely legal case that the calling code should check for before blindly using the returned object.
[out] | object | storage for the default object |
Sets the "default" object for the expression.
This allows the expression writer to not type the object name for frequently-used objects.
This method will only work for expression strings in which the object name is not specified.
[in] | object | the object to be set |
bool isAnimated | ( | MStatus * | ReturnStatus = NULL | ) |
If this is true, then the expression will be evaluated whenever time changes, regardless of whether the other inputs have changed.
If it is false (the default) , then the expression will only be evaluated if one or more of the inputs change.
Note, if 'time' or 'frame' are inputs, then the expression will act as if this was set to true.
[out] | ReturnStatus | Status code |
MStatus setAnimated | ( | bool | value = false | ) |
Sets the way in which the expression is evaluated.
If this is true, then the expression will be evaluated whenever time changes, regardless of whether the other inputs have changed.
If it is false (the default) , then the expression will only be evaluated if one or more of the inputs change.
Note, if 'time' or 'frame' are inputs, then the expression will act as if this was set to true.
[in] | value | sets the objects evaluation type |
MStatus evaluate | ( | MDoubleArray & | result | ) |
Evaluate this expression and return the result.
[out] | result | the value of the expression |
MFnExpression::UnitConversion unitConversion | ( | MStatus * | ReturnStatus = NULL | ) | const |
Get the unit conversion status for the expression node.
[out] | ReturnStatus | Status code |
MStatus setUnitConversion | ( | UnitConversion | conversion | ) |
Set the unit conversion options for the expression node.
[in] | conversion | unit conversion state for this node |
NO SCRIPT SUPPORT.
Gets the expression string for this expression node.
Python Notes
This method is not supported in Python. Please see the one which returns a string
[in] | expression | The expression string |