Magic_Game/core/Manager/SceneManager.cpp

#include "..\e2dmanager.h"
#include "..\e2dbase.h"
#include "..\e2dtransition.h"


e2d::SceneManager * e2d::SceneManager::_instance = nullptr;

e2d::SceneManager * e2d::SceneManager::getInstance()
{
	if (!_instance)
		_instance = new (std::nothrow) SceneManager;
	return _instance;
}

void e2d::SceneManager::destroyInstance()
{
	if (_instance)
	{
		delete _instance;
		_instance = nullptr;
	}
}

e2d::SceneManager::SceneManager()
	: _saveCurrScene(true)
	, _currScene(nullptr)
	, _nextScene(nullptr)
	, _transition(nullptr)
	, _scenes()
{
}

e2d::SceneManager::~SceneManager()
{
}

void e2d::SceneManager::enter(Scene * scene, Transition * transition /* = nullptr */, bool saveCurrentScene /* = true */)
{
	if (!scene)
		return;

	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>
	_nextScene = scene;
	GC::retain(_nextScene);
	
	// <20><><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if (transition)
	{
		if (_transition)
		{
			_transition->_stop();
			GC::release(_transition);
		}
		_transition = transition;
		GC::retain(transition);
		transition->_init(_currScene, _nextScene);
		transition->_update();
	}

	if (_currScene)
	{
		_saveCurrScene = saveCurrentScene;
	}
}

void e2d::SceneManager::back(Transition * transition /* = nullptr */)
{
	// ջΪ<D5BB><CEAA>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><C3B7>س<EFBFBD><D8B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧ<EFBFBD><CAA7>
	WARN_IF(_scenes.size() == 0, "Scene stack is empty!");
	if (_scenes.size() == 0) return;

	// <20><>ջ<EFBFBD><D5BB>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EBA3AC>Ϊ<EFBFBD><CEAA>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>
	_nextScene = _scenes.top();
	_scenes.pop();

	// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>浱ǰ<E6B5B1><C7B0><EFBFBD><EFBFBD>
	if (_currScene)
	{
		_saveCurrScene = false;
	}

	// <20><><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	if (transition)
	{
		_transition = transition;
		GC::retain(transition);
		transition->_init(_currScene, _nextScene);
		transition->_update();
	}
}

void e2d::SceneManager::clear()
{
	// <20><><EFBFBD>ճ<EFBFBD><D5B3><EFBFBD>ջ
	while (_scenes.size())
	{
		auto temp = _scenes.top();
		GC::safeRelease(temp);
		_scenes.pop();
	}
}

e2d::Scene * e2d::SceneManager::getCurrentScene()
{
	return _currScene;
}

std::stack<e2d::Scene*> e2d::SceneManager::getSceneStack()
{
	return _scenes;
}

bool e2d::SceneManager::isTransitioning()
{
	return _transition != nullptr;
}

void e2d::SceneManager::update()
{
	if (_transition == nullptr)
	{
		// <20><><EFBFBD>³<EFBFBD><C2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		if (_currScene)
		{
			_currScene->update();
		}
	}
	else
	{
		// <20><><EFBFBD>³<EFBFBD><C2B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		_transition->_update();

		if (_transition->isDone())
		{
			GC::release(_transition);
			_transition = nullptr;
		}
		else
		{
			return;
		}
	}

	// <20><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>ָ<EFBFBD>벻Ϊ<EBB2BB><CEAA>ʱ<EFBFBD><CAB1><EFBFBD>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>
	if (_nextScene)
	{
		if (_currScene)
		{
			// ִ<>е<EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD> onExit <20><><EFBFBD><EFBFBD>
			_currScene->onExit();

			// <20><>Ҫ<EFBFBD><D2AA><EFBFBD>浱ǰ<E6B5B1><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><D5BB>
			if (_saveCurrScene)
			{
				_scenes.push(_currScene);
			}
			else
			{
				GC::release(_currScene);
			}
		}

		// ִ<><D6B4><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD> onEnter <20><><EFBFBD><EFBFBD>
		_nextScene->onEnter();

		_currScene = _nextScene;		// <20>л<EFBFBD><D0BB><EFBFBD><EFBFBD><EFBFBD>
		_nextScene = nullptr;				// <20><>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD>
	}
}

void e2d::SceneManager::render()
{
	if (_transition)
	{
		_transition->_render();
	}
	else
	{
		// <20><><EFBFBD>Ƶ<EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD>
		if (_currScene)
		{
			_currScene->render();
		}
	}
}