Class XRInteractionGroup

Behaviour implementation of IXRInteractionGroup. An Interaction Group hooks into the interaction system (via XRInteractionManager) and enforces that only one IXRGroupMember within the Group can interact at a time. Each Group member must be either an IXRInteractor or an IXRInteractionGroup.

Inheritance
object
Object
Component
Behaviour
MonoBehaviour
XRInteractionGroup
Implements
Inherited Members
Object.FindObjectsByType<T>(FindObjectsSortMode)
Object.FindObjectsByType<T>(FindObjectsInactive, FindObjectsSortMode)
Object.FindFirstObjectByType<T>()
Object.FindAnyObjectByType<T>()
Object.FindFirstObjectByType<T>(FindObjectsInactive)
Object.FindAnyObjectByType<T>(FindObjectsInactive)
Namespace: UnityEngine.XR.Interaction.Toolkit.Interactors
Assembly: Unity.XR.Interaction.Toolkit.dll
Syntax
[MovedFrom("UnityEngine.XR.Interaction.Toolkit")]
[DisallowMultipleComponent]
[AddComponentMenu("XR/XR Interaction Group", 11)]
[HelpURL("https://docs.unity3d.com/Packages/com.unity.xr.interaction.toolkit@3.2/api/UnityEngine.XR.Interaction.Toolkit.Interactors.XRInteractionGroup.html")]
[DefaultExecutionOrder(-100)]
public class XRInteractionGroup : MonoBehaviour, IXRInteractionOverrideGroup, IXRInteractionGroup, IXRGroupMember
Remarks

The member prioritized for interaction in any given frame is whichever member was interacting the previous frame if it can select in the current frame. If there is no such member, then the interacting member is whichever one in the ordered list of members interacts first.

Properties

activeInteractor

The Interactor in this Interaction Group or any of its member Groups that is currently performing interaction.

Declaration
public IXRInteractor activeInteractor { get; }
Property Value
Type Description
IXRInteractor

containingGroup

The Interaction Group that contains this member.

Declaration
public IXRInteractionGroup containingGroup { get; }
Property Value
Type Description
IXRInteractionGroup

focusInteractable

The Interactable that is currently being focused by an Interactor in this Interaction Group or any of its member Groups.

Declaration
public IXRFocusInteractable focusInteractable { get; }
Property Value
Type Description
IXRFocusInteractable
See Also

focusInteractor

The Interactor in this Interaction Group or any of its member Groups that initiated the last focus event.

Declaration
public IXRInteractor focusInteractor { get; }
Property Value
Type Description
IXRInteractor
See Also

groupName

The name of the interaction group, which can be used to retrieve it from the Interaction Manager.

Declaration
public string groupName { get; }
Property Value
Type Description
string

interactionManager

The XRInteractionManager that this Interaction Group will communicate with (will find one if null).

Declaration
public XRInteractionManager interactionManager { get; set; }
Property Value
Type Description
XRInteractionManager

startingGroupMembers

Ordered list of Interactors or Interaction Groups that are registered with the Group on Awake. All objects in this list should implement the IXRGroupMember interface and either the IXRInteractor interface or the IXRInteractionGroup interface.

Declaration
public List<Object> startingGroupMembers { get; set; }
Property Value
Type Description
List<Object>
Remarks

There are separate methods to access and modify the Group members used after Awake.

See Also

Methods

AddGroupMember(IXRGroupMember)

Adds the given Group member to the end of the ordered list of members in the Group. Causes no change if the Group member is already added.

Declaration
public void AddGroupMember(IXRGroupMember groupMember)
Parameters
Type Name Description
IXRGroupMember groupMember

The Group member to add.
Remarks

groupMember must implement either IXRInteractor or IXRInteractionGroup.

AddInteractionOverrideForGroupMember(IXRGroupMember, IXRGroupMember)

Adds overrideGroupMember as a possible interaction override for sourceGroupMember.

Declaration
public void AddInteractionOverrideForGroupMember(IXRGroupMember sourceGroupMember, IXRGroupMember overrideGroupMember)
Parameters
Type Name Description
IXRGroupMember sourceGroupMember

The Group member whose interaction can be potentially overridden by overrideGroupMember.
IXRGroupMember overrideGroupMember

The Group member to add as a possible interaction override.
Remarks

Both members must be registered with the Group. Additionally, overrideGroupMember must implement either IXRSelectInteractor or IXRInteractionOverrideGroup. This method must not create a loop in the chain of overrides for sourceGroupMember. Use the implementation of GroupMemberIsPartOfOverrideChain(IXRGroupMember, IXRGroupMember) to ensure there is no loop before adding override.

AddStartingInteractionOverride(Object, Object)

Adds overrideGroupMember to the list of Group members that are to be added as interaction overrides for sourceGroupMember on Awake. Both objects must already be included in the startingGroupMembers list. The override object should implement either the IXRSelectInteractor interface or the IXRInteractionOverrideGroup interface.

Declaration
public void AddStartingInteractionOverride(Object sourceGroupMember, Object overrideGroupMember)
Parameters
Type Name Description
Object sourceGroupMember

The Group member whose interaction can be potentially overridden by overrideGroupMember.
Object overrideGroupMember

The Group member to add as a possible interaction override.
Remarks

Use AddInteractionOverrideForGroupMember(IXRGroupMember, IXRGroupMember) to add to the interaction overrides used after Awake.

See Also

Awake()

See MonoBehaviour.

Declaration
protected virtual void Awake()

ClearGroupMembers()

Removes all Group members from the list of members.

Declaration
public void ClearGroupMembers()

ClearInteractionOverridesForGroupMember(IXRGroupMember)

Clears the set of possible interaction overrides for sourceGroupMember.

Declaration
public bool ClearInteractionOverridesForGroupMember(IXRGroupMember sourceGroupMember)
Parameters
Type Name Description
IXRGroupMember sourceGroupMember

The Group member whose interaction can no longer be overridden.
Returns
Type Description
bool

Returns true if there is a set of overrides for sourceGroupMember. Otherwise, returns false.
Remarks

sourceGroupMember must be registered with the Group.

ContainsGroupMember(IXRGroupMember)

Checks whether the given Group member exists in the list of members.

Declaration
public bool ContainsGroupMember(IXRGroupMember groupMember)
Parameters
Type Name Description
IXRGroupMember groupMember

The Group member to check for in the list.
Returns
Type Description
bool

Returns true if groupMember exists in the list. Otherwise, returns false.

GetGroupMembers(List<IXRGroupMember>)

Returns all members in the ordered list of Group members into List results.

Declaration
public void GetGroupMembers(List<IXRGroupMember> results)
Parameters
Type Name Description
List<IXRGroupMember> results

List to receive Group members.
Remarks

This method populates the list with the Group members at the time the method is called. It is not a live view, meaning Group members added or removed afterward will not be reflected in the results of this method. Clears results before adding to it.

GetInteractionOverridesForGroupMember(IXRGroupMember, HashSet<IXRGroupMember>)

Returns all members in the set of possible interaction overrides for sourceGroupMember into set results.

Declaration
public void GetInteractionOverridesForGroupMember(IXRGroupMember sourceGroupMember, HashSet<IXRGroupMember> results)
Parameters
Type Name Description
IXRGroupMember sourceGroupMember

The Group member whose overrides to get.
HashSet<IXRGroupMember> results

Set to receive override Group members.
Remarks

sourceGroupMember must be registered with the Group. This method populates the set with the Group members at the time the method is called. It is not a live view, meaning override Group members added or removed afterward will not be reflected in the results of this method. Clears results before adding to it.

GroupMemberIsPartOfOverrideChain(IXRGroupMember, IXRGroupMember)

Checks whether potentialOverrideGroupMember is either the same as sourceGroupMember or part of a chain of its override Group members and their overrides.

Declaration
public bool GroupMemberIsPartOfOverrideChain(IXRGroupMember sourceGroupMember, IXRGroupMember potentialOverrideGroupMember)
Parameters
Type Name Description
IXRGroupMember sourceGroupMember

The source Group member for the potential chain of override members.
IXRGroupMember potentialOverrideGroupMember

The Group member to check for as part of a chain of overrides.
Returns
Type Description
bool

Returns true if potentialOverrideGroupMember is either the same as sourceGroupMember or part of a chain of its override Group members and their overrides. Otherwise, returns false.

HasDependencyOnGroup(IXRInteractionGroup)

Checks whether the given Group is either the same as this Group or a dependency of any member Group.

Declaration
public bool HasDependencyOnGroup(IXRInteractionGroup group)
Parameters
Type Name Description
IXRInteractionGroup group

The Group to check for as a dependency.
Returns
Type Description
bool

Returns true if group is either the same as this Group or a dependency of this Group. Otherwise, returns false.

MoveGroupMemberTo(IXRGroupMember, int)

Moves the given Group member to the specified index in the ordered list of members in the Group. If the member is not in the list, this can be used to insert the member at the specified index.

Declaration
public void MoveGroupMemberTo(IXRGroupMember groupMember, int newIndex)
Parameters
Type Name Description
IXRGroupMember groupMember

The Group member to move or add.
int newIndex

New index of the Group member.
Remarks

groupMember must implement either IXRInteractor or IXRInteractionGroup.

OnDestroy()

See MonoBehaviour.

Declaration
protected virtual void OnDestroy()

OnDisable()

See MonoBehaviour.

Declaration
protected virtual void OnDisable()

OnEnable()

See MonoBehaviour.

Declaration
protected virtual void OnEnable()

OnFocusEntering(FocusEnterEventArgs)

The XRInteractionManager calls this method right before the Interaction group first gains focus of an Interactable in a first pass.

Declaration
public void OnFocusEntering(FocusEnterEventArgs args)
Parameters
Type Name Description
FocusEnterEventArgs args

Event data containing the Interaction group that is initiating the focus.
Remarks

args is only valid during this method call, do not hold a reference to it.
This method is also invoked when a member interaction group (meaning the group is also an IXRGroupMember added to this interaction group) caused the focus. However, the event data (interactionGroup) contains the reference to the group that directly caused the focus event, so it may not be equal to this group.

See Also

OnFocusExiting(FocusExitEventArgs)

The XRInteractionManager calls this method right before the Interaction group loses focus of an Interactable in a first pass.

Declaration
public void OnFocusExiting(FocusExitEventArgs args)
Parameters
Type Name Description
FocusExitEventArgs args

Event data containing the Interaction group that is losing focus.
Remarks

args is only valid during this method call, do not hold a reference to it.

See Also

RemoveGroupMember(IXRGroupMember)

Removes the given Group member from the list of members.

Declaration
public bool RemoveGroupMember(IXRGroupMember groupMember)
Parameters
Type Name Description
IXRGroupMember groupMember

The Group member to remove.
Returns
Type Description
bool

Returns true if groupMember was removed from the list. Otherwise, returns false if groupMember was not found in the list.

RemoveInteractionOverrideForGroupMember(IXRGroupMember, IXRGroupMember)

Removes overrideGroupMember as a possible interaction override for sourceGroupMember.

Declaration
public bool RemoveInteractionOverrideForGroupMember(IXRGroupMember sourceGroupMember, IXRGroupMember overrideGroupMember)
Parameters
Type Name Description
IXRGroupMember sourceGroupMember

The Group member whose interaction can no longer be overridden by overrideGroupMember.
IXRGroupMember overrideGroupMember

The Group member to remove as a possible interaction override.
Returns
Type Description
bool

Returns true if overrideGroupMember was removed from the set of potential overrides for sourceGroupMember. Otherwise, returns false if overrideGroupMember was not part of the set.
Remarks

sourceGroupMember must be registered with the Group.

RemoveStartingInteractionOverride(Object, Object)

Removes overrideGroupMember from the list of Group members that are to be added as interaction overrides for sourceGroupMember on Awake.

Declaration
public bool RemoveStartingInteractionOverride(Object sourceGroupMember, Object overrideGroupMember)
Parameters
Type Name Description
Object sourceGroupMember

The Group member whose interaction can no longer be overridden by overrideGroupMember.
Object overrideGroupMember

The Group member to remove as a possible interaction override.
Returns
Type Description
bool

Returns true if overrideGroupMember was removed from the list of potential overrides for sourceGroupMember. Otherwise, returns false if overrideGroupMember was not part of the list.
Remarks

Use RemoveInteractionOverrideForGroupMember(IXRGroupMember, IXRGroupMember) to remove from the interaction overrides used after Awake.

See Also

Reset()

See MonoBehaviour.

Declaration
[Conditional("UNITY_EDITOR")]
protected virtual void Reset()

Events

registered

Calls the methods in its invocation list when this Interaction Group is registered with an Interaction Manager.

Declaration
public event Action<InteractionGroupRegisteredEventArgs> registered
Event Type
Type Description
Action<InteractionGroupRegisteredEventArgs>
Remarks

The InteractionGroupRegisteredEventArgs passed to each listener is only valid while the event is invoked, do not hold a reference to it.

See Also

unregistered

Calls the methods in its invocation list when this Interaction Group is unregistered from an Interaction Manager.

Declaration
public event Action<InteractionGroupUnregisteredEventArgs> unregistered
Event Type
Type Description
Action<InteractionGroupUnregisteredEventArgs>
Remarks

The InteractionGroupUnregisteredEventArgs passed to each listener is only valid while the event is invoked, do not hold a reference to it.

See Also

Implements

Extension Methods