Each class of nodekit has a nodekit catalog (
SoNodekitCatalog) that describes the nodes in the subgraph, referred to as parts . The catalog has an entry for each part, with information such as the partName , partType , and nullByDefault (if false the constructor creates it). The catalog also describes the arrangement of parts in the subgraph. (Other information is described below; a complete description is in the
SoNodekitCatalog reference page.)
If we regard the scene graph arrangement as a branching tree, then the top node (root) of the arrangement is always the nodekit itself. The leaf nodes are those at the bottom (containing no children). Some leaves of the tree are defined in the catalog to be public parts, while other leaves are private . All non-leaf parts are considered internal to the nodekit structure and are marked private. Public parts are accessible; they may be requested, changed, or set by the programmer with member functions such as
getPart(). Private parts are not accessible, so methods such as
getPart() will have no effect on them. For example, if you call
getPart() to retrieve a private part, NULL will be returned even when the part exists.
Every nodekit reference page has a Parts section describing the function of each public part it adds to those inherited from its parent class. Also, a Catalog Parts section has tables of often-needed information from the catalog (part type, etc.). These tables include all public parts, both new and inherited. Only the public parts of a nodekit are described in the reference pages. Nodekits take care of the rest for you; they automatically arrange the subgraph, creating and deleting the private parts when necessary. (The
SoNodekitCatalog reference page has methods for finding out the part names and arrangement of all parts, both public and private.)
The nodekit catalog is a template shared by all instances of a class. They use the shared catalog as a guide when creating parts (i.e., constructing actual nodes), but each instance stores its own parts separately. Moreover, nodekits are not
SoGroup nodes, and parts are added as hidden children ; you can only access parts with the methods of
SoBaseKit and its derived classes.
Any public part may be retrieved with
getPart(), installed with
setPart(), or removed by giving a NULL argument to
setPart(). Paths from the nodekit down to a part can be created by createPathToPart().
By default, parts are not created until the user requests or sets them. This keeps the subgraph uncluttered and efficient for traversal. Additionally, removing a part (setting it to NULL) has the extra effect of removing any internal parts that are no longer needed.
Since nodekits hide their children, any
SoPath containing nodekits will end at the topmost nodekit. However, since nodekits may be nested within other nodekits, you may wish to cast an (
SoPath *) into an (SoNodeKitPath *). The methods of SoNodeKitPath allow you to view all nodekits that lie on the path (see the reference page for SoNodeKitPath).
Public parts in the nodekit catalog fall into three categories:
getPart()below shows how to refer to nested parts by name (e.g., "appearance.material"). This works for any nodekit method that takes a part name for an argument.
getPart()(e.g., "childList", or if the list elements are in turn nodekits, "childList.transform").
When the catalog denotes that a part is a list, the part itself is always a node of type
SoNodeKitListPart. The catalog specifies a set of permissible listItemTypes and a listContainerType for that part. It gives this information to the
SoNodeKitListPart when it creates it. From then on, the list part will enforce type checking. So even if you retrieve the
getPart(), you will not be able to add illegal children. (See the
SoNodeKitListPart reference page for more information). As an example, the callbackList part of
SoBaseKit has an
SoSeparator container and allows only
SoEventCallback nodes in the list. Children may be added, retrieved, and removed from an
SoNodeKitListPart node using methods that parallel those of
SoGroup. However, type-checking is strictly enforced.
Note that, although all public parts are leaves in the nodekit catalog, you are free to add children to them (assuming that they are groups, nodekits, or list parts). A part's status as a leaf in the catalog just means that the nodekit will not manage the part's children. For example,
SoWrapperKit has a part called contents with a part type of
SoSeparator. You can put whatever you want underneath the separator, as long as contents itself is an
Thus, a nodekit only controls a section of the scene graph. Above and below that section, anything goes.
However, when nodekits are nested, they effectively create a larger `known' section of the scene graph. For example, the appearance part of the
SoSeparatorKit is a leaf node in the
SoSeparatorKit catalog. But appearance is in turn an
SoAppearanceKit, containing parts such as material and drawStyle. The two nodekits combine to make an even larger template, which the
SoSeparatorKit can examine by looking at the catalogs for both classes. So an
SoSeparatorKit can successfully return a part named "material"; first it finds (or creates) the appearance part, then it gets the material by calling
getPart() on the appearance .
When the catalog defines the listItemTypes of a list part to be nodekits, the name-able space expands further. For example,
SoSeparatorKit has a part childList which permits only SoSeparatorKits, so each list element can be further searched. Hence the name "childList.childList.childList.material" is perfectly legal.
This is the only part that the base class
SoBaseKit creates. It is a public part that is inherited by all nodekits. It provides an easy way to add callbacks for a nodekit to use during action traversal (e.g.
SoHandleEventAction). It is a list part and may contain numerous
Traverses each child in order. Then, for any pick containing the kit on its path, makes an
SoNodeKitDetail as follows: Sets the "detailNodeKit" (retrievable with
SoNodeKitDetail.getNodeKit()) to refer itself. Sets the "detailPart" (retrievable with
SoNodeKitDetail.getPart()) to refer the kit's leaf-most part that lies on the pickPath. Sets the "detailPartName" (retrievable with
SoNodeKitDetail.getPartName()) to be the partName of that part, as found in the catalog.
Does not descend into nested nodekits. Each nodekit along the path is the "detailPart" in its parent's detail. However, if the pick path goes through a list part, the child is used for the "detailPart", and "detailPartName" is of the form "listName[i]".
Behaves like an
SoGroup. Does nothing unless the kit is in the middle of the path chain the action is being applied to. If so, the children up to and including the next node in the chain are traversed.
Begins by writing out regular fields, then writes out the parts. A nodekit does not write out its parts the way an
SoGroup writes out its children. Instead, it writes each part as an
SoSFNode field. First the partName is written, then the node being used for that part.
To keep the files terse, nodekits write out as few parts as possible. However, nodekits always write a part if another instance or a path is writing it. If this is not the case, parts are left out according to the following rules:
SoSeparatornodes do not write.
|Part Name||Part Type||Default Type||NULL Default|
Extra Information for List Parts from Above Table
|Part Name||Container Type||Possible Types|
|Modifier and Type||Field and Description|
Whether to ignore this node during bounding box traversal.
|Constructor and Description|
|Modifier and Type||Method and Description|
Searches the nodekit catalog (and those of all nested nodekits) for the part named partName.
Given a node or a path to a node, checks if the part exists in the nodekit, in a nested nodekit, or an element of a list part.
Returns true if SoGetView functionalities are enabled, false otherwise.
Returns SbViewportRegion origin.
Returns SbViewportRegion size.
Returns true if nodekit children are searched during
This function allows field values of parts (nodes) to be set in several different parts simultaneously.
This function allows field values of parts (nodes) to be set.
Inserts the given node (not a copy) as the new part specified by partName.
Sets if nodekit children are searched during
affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write
copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, setToDefaults
dispose, getEXTERNPROTO, getName, getPROTO, isDisposable, isSynchronizable, setName, setSynchronizable
getAddress, getNativeResourceHandle, startInternalThreads, stopInternalThreads
public final SoSFBool boundingBoxIgnoring
public boolean getViewportIsEnabled()
public SbVec2f getViewportOrigin()
public SbVec2f getViewportSize()
public static boolean isSearchingChildren()
SoSearchActiontraversal. By default, they are not.
public boolean set(java.lang.String partNameString, java.lang.String parameterString)
SoSeparatorKithas a part named material which is of type
public static SoNodekitCatalog getClassNodekitCatalog()
public static void setSearchingChildren(boolean newVal)
SoSearchActiontraversal. By default, they are not.
public SoNodekitCatalog getNodekitCatalog()
public boolean setPart(java.lang.String partName, SoNode newPart)
getPart()for the syntax of partName. This method adds any extra nodes needed to fit the part into the nodekit's catalog. Run-time type checking verifies that the node type of newPart matches the type called for by partName. For example, if partName was a material for an
SoSeparatorKit, but newPart was an
SoTransformnode, then the node would not be installed, and false would be returned.
If newPart is NULL, then the node specified by partName is removed. If this renders any private parts useless (as occurs when you remove the last child of an
SoGroup node), they will also be removed. Hence nodekits do not retain unnecessary nodes.
true is returned on success, and false upon error.
public boolean set(java.lang.String nameValuePairListString)
public SoNode getPart(java.lang.String partName, boolean makeIfNeeded)
getPart()will create the part (as well as any necessary intermediary parts), put it in the correct place, and return the newly created part.
Elements of list parts and parts within nested nodekits can all be retrieved with
getPart() The full syntax for legal partName arguments is given below.
Part name BNF notation :
partName = singleName | compoundName
compoundName = singleName | compoundName.singleName
singleName = singlePartName | singleListElementName
singlePartName = the name of any single part in the catalog (including those that are lists or nodekits), or in the recursively nested catalogs of any of its parts.
singleListElementName = singleListName[index]
singleListName = the name of any single list-type part in the catalog, or in the recursively nested catalogs of any of its parts.
index = integer
Examples of valid part names are:
"transform", "appearance.material", "childList.drawStyle", "foot", "bird.leftLeg.foot", "octopus.leg.suctionCup.material"
public java.lang.String getPartString(SoBase part)
Generated on March 25, 2020, Copyright © Thermo Fisher Scientific. All rights reserved. http://www.openinventor.com