private TaskStatus RunTask(BehaviorManager.BehaviorTree behaviorTree, int taskIndex, int stackIndex)
{
Task task = behaviorTree.taskList[taskIndex];
// 第一步：加保护
if (null == task)
{
Debug.LogError("NULL TASK");
return(TaskStatus.Failure);
}
TaskStatus taskStatus = task.NodeData.ExecutionStatus;
// 第二步：Push，再在Push里调用OnStart
PushTask(behaviorTree, taskIndex, stackIndex);
// 第三步：如果是父节点
if (task is ParentTask)
{
ParentTask parentTask = task as ParentTask;
int childIndex = -1;
TaskStatus currentChildTaskStatus = TaskStatus.Inactive;
// 1、父节点是否已经执行完所有孩子了
while (parentTask.CanExecute())
{
if (task is Decorator && (behaviorTree.decoratorIndexList.Contains(taskIndex)))
{
break;
}
// 2、如果可以并行地执行所有孩子就不用等当前孩子跑完
if (parentTask.CanRunParallelChildren() || TaskStatus.Running != currentChildTaskStatus)
{
childIndex = parentTask.CurrentChildIndex();
int nextRunTaskIndex = behaviorTree.GetIndexInTaskList(taskIndex, childIndex);
if (parentTask.CanRunParallelChildren())
{
behaviorTree.activeStackList.Add(new Stack <int>());
stackIndex = behaviorTree.activeStackList.Count - 1;
parentTask.OnChildStarted(childIndex);
}
else
{
parentTask.OnChildStarted();
}
// 3、跑下一个子节点
currentChildTaskStatus = RunTask(behaviorTree, nextRunTaskIndex, stackIndex);
taskStatus = currentChildTaskStatus;
if (parentTask is Decorator)
{
behaviorTree.decoratorIndexList.Add(taskIndex);
behaviorTree.decoratorIndexStatusDic.Add(taskIndex, parentTask.OverrideStatus(taskStatus));
}
}
else
{
break;
}
}
// 关于Decorator的特殊逻辑
if (task is Decorator && behaviorTree.decoratorIndexList.Contains(taskIndex))
{
taskStatus = behaviorTree.decoratorIndexStatusDic[taskIndex];
behaviorTree.decoratorIndexList.Remove(taskIndex);
behaviorTree.decoratorIndexStatusDic.Remove(taskIndex);
return(taskStatus);
}
taskStatus = parentTask.OverrideStatus(taskStatus);
}
// 第四步：如果是子节点，直接跑自己的OnUpdate
else
{
taskStatus = task.OnUpdate();
}
// 保存好本帧自己的执行结果
task.NodeData.ExecutionStatus = taskStatus;
// 第五步：不管是正常跑完还是非正常终止的都要调下OnEnd
if (TaskStatus.Running != taskStatus)
{
PopTask(behaviorTree, taskIndex, stackIndex, (task is ParentTask));
}
return(taskStatus);
}