/// <summary>
/// 添加根节点。
/// </summary>
/// <param name="action"></param>
/// <param name="checker"></param>
/// <returns></returns>
public ActionPair AddRoot(ExecuteAction action, CheckActionState checker)
{
var root = new ActionPair(action, checker);
_head.AddDefaultChild(root);
return(root);
}
/// <summary>
/// 开始执行整个动作树。
/// </summary>
public void Start()
{
CurrentAction = _head.GetChild(ActionState.Default);
if (CurrentAction != null && CurrentAction.Action != null)
{
// 立即执行第一个动作。
CurrentAction.Action();
}
CurrentState = ActionTreeState.Running;
}
/// <summary>
/// 由上层的MonoBehaviour调用。
/// </summary>
public void Update()
{
if (CurrentState != ActionTreeState.Running)
{
return;
}
if (CurrentAction == null)
{
// 如果当前没有执行Action，则直接结束所有的动作。
CompleteActionTree();
return;
}
if (CurrentAction.Checker != null)
{
// 存在checker，则检查checker的结果。
CurrentAction.Checker(CurrentAction.State);
if (CurrentAction.State.Result != ActionState.Continue)
{
// 不是Contine，则尝试开始下一个动作。
var next = CurrentAction.GetChild(CurrentAction.State.Result);
CurrentAction = next;
if (CurrentAction != null && CurrentAction.Action != null)
{
CurrentAction.Action();
}
}
}
else
{
// 不存在checker，则尝试查找默认的动作。
var next = CurrentAction.GetChild(ActionState.Default);
CurrentAction = next;
if (CurrentAction != null && CurrentAction.Action != null)
{
CurrentAction.Action();
}
}
}
/// <summary>
/// 添加子节点。
/// </summary>
/// <param name="key"></param>
/// <param name="child"></param>
/// <returns>返回当前节点，一遍重复添加。</returns>
public ActionPair AddChild(int key, ActionPair child)
{
if (child == null)
{
return(this);
}
if (Children == null)
{
Children = new Dictionary <int, ActionPair>();
}
if (Children.ContainsKey(key))
{
Children[key] = child;
}
else
{
Children.Add(key, child);
}
return(this);
}
/// <summary>
/// 添加默认的子节点。
/// </summary>
/// <param name="child"></param>
/// <returns></returns>
public ActionPair AddDefaultChild(ActionPair child)
{
if (child == null)
{
return(this);
}
if (Children == null)
{
Children = new Dictionary <int, ActionPair>();
}
if (Children.ContainsKey(ActionState.Default))
{
Children[ActionState.Default] = child;
}
else
{
Children.Add(ActionState.Default, child);
}
return(this);
}
/// <summary>
/// 重置状态。
/// </summary>
public void Reset()
{
CurrentAction = _head;
CurrentState = ActionTreeState.Idle;
}