KeyEventHandler.hh

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/*
 * Copyright (C) 2012-2014 Open Source Robotics Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/
#ifndef _KEY_EVENT_HANDLER_HH_
#define _KEY_EVENT_HANDLER_HH_

#include <boost/function.hpp>
#include <string>
#include <list>

#include "gazebo/common/SingletonT.hh"
#include "gazebo/common/KeyEvent.hh"
#include "gazebo/util/system.hh"

namespace gazebo
{
  namespace gui
  {
    class GAZEBO_VISIBLE KeyEventHandler : public SingletonT<KeyEventHandler>
    {
      public: typedef boost::function<bool (const common::KeyEvent &_event)>
              KeyEventFilter;

      private: class Filter
               {
                 public: Filter(const std::string &_name,
                                KeyEventFilter _func)
                         : name(_name), func(_func) {}

                 public: bool operator==(const Filter &_f) const
                         {
                           return this->name == _f.name;
                         }

                 public: bool operator==(const std::string &_f) const
                         {
                           return this->name == _f;
                         }

                 public: std::string name;

                 public: KeyEventFilter func;
               };

      private: KeyEventHandler();

      private: virtual ~KeyEventHandler();

      public: void AddPressFilter(const std::string &_name,
                  KeyEventFilter _filter);

      public: void AddReleaseFilter(const std::string &_name,
                  KeyEventFilter _filter);

      public: void RemovePressFilter(const std::string &_name);

      public: void RemoveReleaseFilter(const std::string &_name);

      public: void HandlePress(const common::KeyEvent &_event);

      public: void HandleRelease(const common::KeyEvent &_event);

      private: void Add(const std::string &_name, KeyEventFilter _filter,
                   std::list<Filter> &_list);

      private: void Remove(const std::string &_name, std::list<Filter> &_list);

      private: void Handle(const common::KeyEvent &_event,
                   std::list<Filter> &_list);

      private: std::list<Filter> pressFilters;

      private: std::list<Filter> releaseFilters;

      private: friend class SingletonT<KeyEventHandler>;
    };
  }
}
#endif