84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
// Copyright (C) 2015 Jérôme Leclercq
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// This file is part of the "Nazara Development Kit"
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// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
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#include <Nazara/Core/Error.hpp>
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#include <NDK/StateMachine.hpp>
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#include <utility>
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namespace Ndk
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{
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/*!
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* \ingroup NDK
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* \class Ndk::StateMachine
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* \brief NDK class that represents a state machine, to represent the multiple states of your program
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*/
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/*!
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* \brief Constructs a StateMachine object with an original state
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*
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* \param originalState State which is the entry point of the application
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*
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* \remark Calls "Enter" on the state
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* \remark Produces a NazaraAssert if nullptr is given
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*/
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inline StateMachine::StateMachine(std::shared_ptr<State> originalState) :
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m_currentState(std::move(originalState))
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{
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NazaraAssert(m_currentState, "StateMachine must have a state to begin with");
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m_currentState->Enter(*this);
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}
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/*!
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* \brief Destructs the object
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*
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* \remark Calls "Leave" on the state
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*/
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inline StateMachine::~StateMachine()
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{
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m_currentState->Leave(*this);
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}
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/*!
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* \brief Changes the current state of the machine
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*
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* \param state Next state to represent
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*/
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inline void StateMachine::ChangeState(std::shared_ptr<State> state)
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{
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m_nextState = std::move(state);
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}
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/*!
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* \brief Gets the current state of the machine
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* \return A constant reference to the state
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*/
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inline const std::shared_ptr<State>& StateMachine::GetCurrentState() const
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{
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return m_currentState;
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}
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/*!
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* \brief Updates the state
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* \return True if update is successful
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*
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* \param elapsedTime Delta time used for the update
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*/
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inline bool StateMachine::Update(float elapsedTime)
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{
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if (m_nextState)
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{
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m_currentState->Leave(*this);
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m_currentState = std::move(m_nextState);
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m_currentState->Enter(*this);
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}
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return m_currentState->Update(*this, elapsedTime);
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}
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}
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