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NAME
SoSelection — manages a list of selected objects
INHERITS FROM
SoBase > SoFieldContainer > SoNode > SoGroup > SoSeparator > SoSelection
SYNOPSIS
#include <Inventor/nodes/SoSelection.h>
typedef void SoSelectionPathCB(void *userData, SoPath *path)
typedef void SoSelectionClassCB(void *userData, SoSelection *sel)
typedef SoPath * SoSelectionPickCB(void *userData, const SoPickedPoint *pick)
enum Policy {
SoSelection::SINGLE Left mouse pick on object clears selection, then selects object. Left mouse pick
on nothing clears selection. Only one object may be selected at a time.
SoSelection::TOGGLE Left mouse pick on object toggles its selection status. Left mouse pick on
nothing does nothing. Multiple objects may be selected.
SoSelection::SHIFT When shift key is down, selection policy is TOGGLE. When shift key is up,
selection policy is SINGLE. Multiple objects may be selected.
}
Fields from class SoSelection:
SoSFEnum policy
Fields from class SoSeparator:
SoSFEnum renderCaching
SoSFEnum boundingBoxCaching
SoSFEnum renderCulling
SoSFEnum pickCulling
Methods from class SoSelection:
SoSelection()
SoSelection(int nChildren)
static SoType getClassTypeId()
void select(const SoPath *path)
void select(SoNode *node)
void deselect(const SoPath *path)
void deselect(int which)
void deselect(SoNode *node)
void toggle(const SoPath *path)
void toggle(SoNode *node)
SbBool isSelected(const SoPath *path) const
SbBool isSelected(SoNode *node) const
void deselectAll()
int getNumSelected() const
const SoPathList * getList() const
SoPath * getPath(int index) const
SoPath * operator [](int i) const
void addSelectionCallback(SoSelectionPathCB *f, void *userData = NULL)
void removeSelectionCallback(SoSelectionPathCB *f, void *userData = NULL)
void addDeselectionCallback(SoSelectionPathCB *f, void *userData = NULL)
void removeDeselectionCallback(SoSelectionPathCB *f, void *userData = NULL)
void addStartCallback(SoSelectionClassCB *f, void *userData = NULL)
void removeStartCallback(SoSelectionClassCB *f, void *userData = NULL)
void addFinishCallback(SoSelectionClassCB *f, void *userData = NULL)
void removeFinishCallback(SoSelectionClassCB *f, void *userData = NULL)
void setPickFilterCallback(SoSelectionPickCB *f, void *userData = NULL, SbBool
callOnlyIfSelectable = TRUE)
void setPickMatching(SbBool pickTwice)
SbBool getPickMatching() const
Methods from class SoSeparator:
static void setNumRenderCaches(int howMany)
static int getNumRenderCaches()
Methods from class SoGroup:
void addChild(SoNode *child)
void insertChild(SoNode *child, int newChildIndex)
SoNode * getChild(int index) const
int findChild(const SoNode *child) const
int getNumChildren() const
void removeChild(int index)
void removeChild(SoNode *child)
void removeAllChildren()
void replaceChild(int index, SoNode *newChild)
void replaceChild(SoNode *oldChild, SoNode *newChild)
Methods from class SoNode:
void setOverride(SbBool state)
SbBool isOverride() const
SoNode * copy(SbBool copyConnections = FALSE) const
virtual SbBool affectsState() const
static SoNode * getByName(const SbName &name)
static int getByName(const SbName &name, SoNodeList &list)
Methods from class SoFieldContainer:
void setToDefaults()
SbBool hasDefaultValues() const
SbBool fieldsAreEqual(const SoFieldContainer *fc) const
void copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)
SbBool set(const char *fieldDataString)
void get(SbString &fieldDataString)
virtual int getFields(SoFieldList &resultList) const
virtual SoField * getField(const SbName &fieldName) const
SbBool getFieldName(const SoField *field, SbName &fieldName) const
SbBool isNotifyEnabled() const
SbBool enableNotify(SbBool flag)
Methods from class SoBase:
void ref()
void unref() const
void unrefNoDelete() const
void touch()
virtual SoType getTypeId() const
SbBool isOfType(SoType type) const
virtual void setName(const SbName &name)
virtual SbName getName() const
DESCRIPTION
SoSelection defines a node which can be inserted into a scene graph and will generate and manage a
selection list from picks on any node in the subgraph below it. Nodes are selected based on a current
selection policy. Callback functions report back to the application when a path has been selected or
deselected. The selection list can also be managed programmatically.
When handling events, SoSelection makes sure that the mouse release event was over the same object as the
mouse press event before changing the list of selected objects. This allows users to mouse down on an
object, change their mind and move the cursor off the object, then release the mouse button without
altering the selection.
The selection can be highlighted automatically through the SoXtRenderArea, or the application can provide
custom highlights. Please see the chapter "Creating a Selection Highlight Style" in the Inventor
Toolmaker.
FIELDS
SoSFEnum policy
Selection policy that is followed in response to user interaction. This can be set to
SoSelection::SINGLE, SoSelection::TOGGLE, or SoSelection::SHIFT.
METHODS
SoSelection()
Creates a selection node with the default settings.
SoSelection(int nChildren)
Constructor that specifies the approximate number of children.
static SoType getClassTypeId()
Return the type id for the SoSelection class.
void select(const SoPath *path)
Select the passed path by adding it to the selection list. The selection node must lie in the path.
The path is copied and truncated such that the selection node is the head of the path. If the
selection node does not lie in the path, the selection list remains unchanged. This method ignores the
current selection policy.
void select(SoNode *node)
Select the passed node by creating a path to it, and adding the path to the selection list by calling
select(path). If there is more than one instance of node beneath the selection node, the created path
will be the first instance found.
void deselect(const SoPath *path)
Deselect the passed path by removing it from the selection list.
void deselect(int which)
Deselect a path by removing it from the selection list. The argument which specifies which path in the
list to be removed.
void deselect(SoNode *node)
Deselect the passed node by creating a path to it, and removing the node from the selection list by
calling deselect(path). If there is more than one instance of node beneath the selection node, the
created path will be the first instance found.
void toggle(const SoPath *path)
Toggle the selection status of the passed path — if the path is in the selection list, it is removed;
if not in the list, it is added.
void toggle(SoNode *node)
Toggle the selection status of the passed node by creating a path to it, then calling toggle(path). If
there is more than one instance of node beneath the selection node, the created path will be the first
instance found.
SbBool isSelected(const SoPath *path) const
Returns TRUE if the passed path is selected, that is, if it is in the selection list.
SbBool isSelected(SoNode *node) const
Returns TRUE if the passed node is selected by creating a path to it, then calling isSelected(). If
there is more than one instance of node beneath the selection node, the created path will be the first
instance found.
void deselectAll()
Deselect all paths in the selection list, that is, clear the list.
int getNumSelected() const
Return the number of paths in the selection list.
const SoPathList * getList() const
Return the list of selected paths.
SoPath * getPath(int index) const
SoPath * operator [](int i) const
Return the ith path in the selection list.
void addSelectionCallback(SoSelectionPathCB *f, void *userData = NULL)
void removeSelectionCallback(SoSelectionPathCB *f, void *userData = NULL)
The selection callbacks are invoked every time an object is selected, whether it be from user
interaction or from method call. The callbacks are invoked after the object has been added to the
selection list.
void addDeselectionCallback(SoSelectionPathCB *f, void *userData = NULL)
void removeDeselectionCallback(SoSelectionPathCB *f, void *userData = NULL)
The deselection callbacks are invoked every time an object is deselected, whether it be from user
interaction or from method call. This is invoked after the object has been removed from the selection
list.
void addStartCallback(SoSelectionClassCB *f, void *userData = NULL)
void removeStartCallback(SoSelectionClassCB *f, void *userData = NULL)
The start callbacks are invoked when the user has initiated an interactive change to the selection
list (by picking objects). This will be followed by invocations of the select and/or deselect
callbacks, finally followed by each finish callback. A start callback can be used, for instance, to
save the current selection for later restoration (e.g. undo/redo). The start callbacks are not called
when the selection list is changed programmatically.
void addFinishCallback(SoSelectionClassCB *f, void *userData = NULL)
void removeFinishCallback(SoSelectionClassCB *f, void *userData = NULL)
The finish callbacks are invoked when the user has finished interactively changing the selection list
(by picking objects). This was preceded by an invocation of each start callback, and invocations of
the select and/or deselect callbacks. The finish callbacks are not called when the selection list is
changed programmatically.
void setPickFilterCallback(SoSelectionPickCB *f, void *userData = NULL, SbBool
callOnlyIfSelectable = TRUE)
The pick filter callback is invoked when a pick has occurred and the selection node is about to change
the selection list. The callback function returns the path that the selection node should use when
selecting and deselecting. If no pick callback is registered (the default), the selection node will
use the path returned by SoPickedPoint::getPath() on the picked point associated with the event being
processed. The returned path should not be ref'd - selection will ref() and unref() it. (See
SoPath::unrefNoDelete().)
Note that a picked object may or may not be a child of the selection node. A selection node will only
select paths that pass through it. Possible return values from the callback:
[a] NULL — selection behaves as if nothing was picked (i.e. for SINGLE and SHIFT policies, this clears
the selection list). Handle event action traversal halts.
[b] Path — this path will be selected/deselected according to the selection policy (it must lie under
the selection node). Handle event action traversal halts.
[c] Path containing only the selection node — apply the selection policy as if nothing was picked.
Handle event action traversal continues.
[d] Path not passing through the selection node — selection ignores this pick event and no change is
made to the selection list. Handle event action traversal continues.
A simple way to tell selection to ignore the pick is to return an SoPath with no nodes in it. (i.e.
return new SoPath;) Selection will always ref the path returned by the callback, make a copy of the
path, then unref the path.
The callOnlyIfSelectable argument, when set to TRUE, means the pick callback function will only be
invoked on picks which pass through the selection node. When FALSE, all picks will be passed to the
callback whether they pass through the selection or not.
void setPickMatching(SbBool pickTwice)
SbBool getPickMatching() const
SoSelection will pick once on mouse down and once on mouse up, and make sure the picks match before
changing the selection list. This allows the user to pick down on an object, change their mind and
drag off the object, release the mouse button and not affect the selection. Pass TRUE to enable this
behavior. Pass FALSE to disable this, meaning whatever is picked on a mouse release is added
to/removed from the selection list. Default is pick-matching on.
FILE FORMAT/DEFAULTS
Selection {
renderCaching AUTO
boundingBoxCaching AUTO
renderCulling AUTO
pickCulling AUTO
policy SHIFT
}
SEE ALSO
SoEventCallback, SoXtRenderArea, SoBoxHighlightRenderAction, SoLineHighlightRenderAction
SoSelection(3IV)()