public override BehaviorResult Exec(IBehaviorTree tree)
{
if (m_ChildNodes.Count == 0)
{
return(BehaviorResult.failed);
}
SetStarting();
while (true)
{
if (curNode == null)
{
curNode = CheckPreconditionChild();
}
if (curNode != null)
{
//每次都重新检查子节点条件
BehaviorWithPreconditonNode newNode = CheckPreconditionChild();
if (newNode != curNode)
{
curNode.Abort();
curNode = newNode;
if (curNode == null)
{
// 等待到下一帧再跳到循环开头继续检测
return(BehaviorResult.running);
}
}
BehaviorResult result = curNode.Exec(tree);
if (result == BehaviorResult.success)
{
SetCompleted();
return(BehaviorResult.success);
}
else if (result == BehaviorResult.failed)
{
// 子节点执行失败时不退出，继续选择
curNode = null;
return(BehaviorResult.running);
}
else if (result == BehaviorResult.running)
{
return(BehaviorResult.running);// 等待一帧
}
}
else
{
return(BehaviorResult.running);
}
}
}
protected BehaviorWithPreconditonNode CheckPreconditionChild()
{
for (int i = 0; i < m_ChildNodes.Count; ++i)
{
BehaviorWithPreconditonNode child = m_ChildNodes[i] as BehaviorWithPreconditonNode;
if (child.IsConditionSatisfied())
{
return(child);
}
}
return(null);
}
protected override void Reset()
{
base.Reset();
curNode = null;
}
abstract public void VisitWithPreconditionNode(BehaviorWithPreconditonNode node);