MainMenuState.cpp

#include "MainMenuState.h"
#include <iostream>
#include "TextureManager.h"
#include "Game.h"
#include "MenuButton.h"
#include "PlayState.h"
#include "StateParser.h"

const std::string MainMenuState::s_menuID = "MENU";

//function to be called when PLAY button is pressed
void MainMenuState::s_menuToPlay()
{
	//change the state to Play State
	TheGame::Instance()->getStateMachine()->changeState(new PlayState());
}

//function to be called when EXIT button is pressed
void MainMenuState::s_exitFromMenu()
{
	//exit the game
	TheGame::Instance()->quit();
}

//update each game object
void MainMenuState::update()
{
	for (int i = 0; i < (int)m_gameObjects.size(); ++i)
	{
		m_gameObjects[i]->update();
	}
}

//draw the game objects
void MainMenuState::render()
{
	for (int i = 0; i < (int)m_gameObjects.size(); ++i)
	{
		m_gameObjects[i]->draw();
	}
}

bool MainMenuState::onEnter()
{	
	//parse the state
	StateParser stateParser;
	stateParser.parseState("test.xml", s_menuID, &m_gameObjects, &m_textureIDList);

	m_callbacks.push_back(0); //pushback 0 callbackID start from 1
	m_callbacks.push_back(s_menuToPlay);
	m_callbacks.push_back(s_exitFromMenu);

	//set the callbacks for menu items
	setCallbacks(m_callbacks);

	std::cout << "entering MenuState\n";
	return true;
}

bool MainMenuState::onExit()
{	
	//clear the texture manager
	for (int i = 0; i < (int)m_textureIDList.size(); ++i)
	{
		TheTextureManager::Instance()->clearFromTextureMap(m_textureIDList[i]);
	}

	std::cout << "exiting MenuState\n";
	return true;
}

void MainMenuState::setCallbacks(const std::vector<Callback> &callbacks)
{
	//go through the game objects
	for (int i = 0; i < m_gameObjects.size(); ++i)
	{
		//if they are of type MenuButton then assign a callback
		//based on the id passed in from the file
		if (dynamic_cast<MenuButton*>(m_gameObjects[i]))
		{
			MenuButton* pButton = dynamic_cast<MenuButton*>(m_gameObjects[i]);
			pButton->setCallback(callbacks[pButton->getCallbackID()]);
		}
	}
}