fsm.hpp
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上传日期:2020-07-06
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midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * fsm.hpp
- *****************************************************************************
- * Copyright (C) 2003 the VideoLAN team
- * $Id: e2d7608995dbe8718e90694a34ed9f1ed3f0e92e $
- *
- * Authors: Cyril Deguet <asmax@via.ecp.fr>
- * Olivier Teulière <ipkiss@via.ecp.fr>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifndef FSM_HPP
- #define FSM_HPP
- #include "../src/skin_common.hpp"
- #include <string>
- #include <map>
- #include <set>
- class EvtGeneric;
- class CmdGeneric;
- /// This class implements a Finite State Machine (FSM)
- class FSM: public SkinObject
- {
- public:
- FSM( intf_thread_t *pIntf ): SkinObject( pIntf ) {}
- virtual ~FSM() {}
- /// Add a state to the machine
- void addState( const string &state );
- /// Add a transition to the machine
- void addTransition( const string &state1, const string &event,
- const string &state2,
- CmdGeneric *pCmd = NULL );
- /// Retrieve the current state
- const string &getState() const { return m_currentState; }
- /// Set the current state, without bothering about transitions
- void setState( const string &state );
- /// Find a transition from the current state with the input event,
- /// change the state, and call the associated callback (if any).
- void handleTransition( const string &event );
- private:
- /// A Key_t contains the initial state of a transition, and a string
- /// characterizing an event (for example: "mouse:left:down:ctrl")
- typedef pair<string, string> Key_t;
- /// A Data_t contains the final state of a transition, and a callback
- /// to execute when the transition is applied
- typedef pair<string, CmdGeneric*> Data_t;
- /// Current state of the machine
- string m_currentState;
- /// Set containing the different states
- set<string> m_states;
- /// Map containing the different transitions between defined types
- /// It associates a final state (and potentially a callback)
- /// with a couple of the form: (currentState, triggerEvent)
- map<Key_t, Data_t> m_transitions;
- };
- #endif