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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)()