statemachine.cpp

#include "statemachine.h"
#include "state.h"
#include "debug.h"

using namespace irr;
using namespace core;

extern Debug* dbg;

StateMachine::StateMachine(IrrlichtDevice* d)
{
    //ctor
    dbg->log("create StateMachine");
    device = d;
    currentState = NULL;
}

StateMachine::~StateMachine()
{
    //dtor
}

void StateMachine::addState(State* s)
{
    states.push_back(s);
}

void StateMachine::pushEvent(c8* event)
{
    events.push_back(stringc(event));
}

stringc StateMachine::popEvent()
{
    u32 s = events.size();
    if (s <= 0)
    {
        return stringc("");
    }

    stringc event = events[s-1];
    events.erase(s-1);
    return event;
}

void StateMachine::update(u32 deltaTime)
{
    if (! events.empty())
    {
        stringc tmp = popEvent();

        // transition to other state?
        for (u32 i=0; i<states.size(); i++)
        {
            State* s = states[i];
            if (tmp.equals_ignore_case(s->getName()))
            {
                // transition found
                // exit this state
                currentState->exit();
                // change state
                currentState = s;
                // entry next state
                device->setEventReceiver(currentState);
                currentState->entry();
                currentState->render(deltaTime);
                return;
            }
        }
    }

        currentState->render(deltaTime);
}

State* StateMachine::getCurrentState()
{
    return currentState;
}

void StateMachine::startWith(State* s)
{
    dbg->log("start StateMachine with State", s->getName());
    currentState = s;
    device->setEventReceiver(currentState);
    currentState->entry();
}

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