/// <summary>
/// Tells the iterator to abort the current running subtree and jump to the aborter.
/// </summary>
/// <param name="aborter"></param>
public void OnAbort(ConditionalAbort aborter)
{
BehaviourNode parent = aborter.Parent;
int terminatingIndex = BehaviourNode.kInvalidOrder;
if (parent)
{
terminatingIndex = parent.preOrderIndex;
}
// If an abort node is the root, then we need to empty the entire traversal.
// We can achieve this by setting the terminating index to the invalid index, which is an invalid index
// and will empty the traversal.
while (_traversal.Count != 0 && _traversal.Peek() != terminatingIndex)
{
StepBackAbort();
}
// Only composite nodes need to worry about which of their subtrees fired an abort.
if (parent.MaxChildCount() > 1)
{
parent.OnAbort(aborter);
}
// Any requested traversals are cancelled on abort.
_requestedTraversals.Clear();
Traverse(aborter);
}
/// <summary>
/// Test if the aborter may abort the node.
/// Make sure that the node orders are pre-computed before calling this function.
/// This method is mainly used by the editor.
/// </summary>
/// <param name="aborter">The node to perform the abort.</param>
/// <param name="node">The node that gets aborted.</param>
/// <returns></returns>
public static bool IsAbortable(ConditionalAbort aborter, BehaviourNode node)
{
// This makes sure that dangling nodes do not show that they can abort nodes under main tree.
if (aborter.preOrderIndex == kInvalidOrder)
{
return(false);
}
// Parallel subtrees cannot abort each other.
if (aborter.Parent && aborter.Parent is Parallel)
{
return(false);
}
switch (aborter.abortType)
{
case AbortType.LowerPriority:
return
(!BehaviourTree.IsUnderSubtree(aborter, node) &&
BehaviourTree.IsUnderSubtree(aborter.Parent, node) &&
aborter.Priority() > GetSubtree(aborter.Parent, node).Priority());
// Self aborts always interrupt, regardless of the condition.
case AbortType.Self:
return(BehaviourTree.IsUnderSubtree(aborter, node));
case AbortType.Both:
return
(BehaviourTree.IsUnderSubtree(aborter, node) ||
(BehaviourTree.IsUnderSubtree(aborter.Parent, node) &&
aborter.Priority() > GetSubtree(aborter.Parent, node).Priority()));
}
return(false);
}
/// <summary>
/// Called when a composite node has a child that activates when it aborts.
/// </summary>
/// <param name="child"></param>
protected internal override void OnAbort(ConditionalAbort child)
{
// The default behaviour is to set the current child index of the composite
// node to this child's index.
if (IsChild(child))
{
_currentChildIndex = child._indexOrder;
}
else
{
Debug.LogError("The node is not parented to this composite node.");
}
}
// Note on multiple aborts:
// If there are multiple satisfied aborts, then
// the tree picks the highest order abort (left most).
private void TickObservers()
{
for (int i = 0; i < _observerAborts.Count; ++i)
{
ConditionalAbort node = _observerAborts[i];
// The iterator must be running since aborts can only occur under
// actively running subtrees.
if (!node.Iterator.IsRunning)
{
continue;
}
// If the condition is true then apply an abort.
if (node.IsAbortSatisfied())
{
node.Iterator.OnAbort(node);
}
}
}
// Does nothing since tasks do not have children.
protected internal sealed override void OnAbort(ConditionalAbort aborter)
{
}
/// <summary>
/// Called when a child fires an abort.
/// </summary>
/// <param name="aborter"></param>
public virtual void OnAbort(ConditionalAbort aborter)
{
}
// Does nothing since tasks do not have children.
public sealed override void OnAbort(ConditionalAbort aborter)
{
}
/// <summary>
/// Called when a child fires an abort.
/// </summary>
/// <param name="aborter"></param>
protected internal virtual void OnAbort(ConditionalAbort aborter)
{
}