序列动作就是一个一个的执行动作

以下是Lite2D的Sequence 实现

#include"Sequence.h"#include 
    
     Sequence::Sequence() :current(0){ }Sequence*  Sequence::create(Action *_action1, ...){	Sequence *ins = new Sequence;	ins->autorelease();	ins->addAction(_action1); 	va_list li;	Action*action=nullptr;	va_start(li, _action1); 	while (action = va_arg(li, Action*))	{		ins->addAction(action);	}	va_end(li);	return ins;}void Sequence::addAction(Action*action){	action->retain();	_queue.push_back(action);}void Sequence::update(){ 	if (_queue[current]->isDone())	{		++current;	}	if (current < _queue.size())	{		_queue[current]->update();	}	else	{		this->clear();		this->_isdone = true;		return;	}}void Sequence::setTarget(Node*target){	this->target = target;	for (const auto & ac : _queue)	{		ac->setTarget(target);	}}void Sequence::clear(){	for (const auto & ac : _queue)	{		ac->release();	}	_queue.clear();}Sequence::~Sequence(){	this->clear();	current = 0;}