source/core/event.h

   1 /*
   2 This file is part of libmspframework
   3 Copyright © 2006 Mikko Rasa, Mikkosoft Productions
   4 Distributed under the LGPL
   5 */
   6 #ifndef MSP_FRAMEWORK_EVENT_H_
   7 #define MSP_FRAMEWORK_EVENT_H_
   8
   9 #include <sigc++/sigc++.h>
  10 #include "pollable.h"
  11
  12 namespace Msp {
  13
  14 class Application;
  15
  16 /**
  17 Events can be used in multi-threaded applictions to trigger actions in the main
  18 thread.
  19 */
  20 class EventManager
  21 {
  22 public:
  23         class Event
  24         {
  25         public:
  26                 sigc::signal<void> signal_triggered;
  27
  28                 Event(EventManager &m, unsigned i): mgr(m), id(i) { }
  29                 unsigned get_id() const { return id; }
  30                 void trigger();
  31         private:
  32                 EventManager &mgr;
  33                 unsigned id;
  34         };
  35
  36         EventManager(Application &);
  37         Event &create_event();
  38 private:
  39         class Pipe: public Pollable
  40         {
  41         public:
  42                 Pipe();
  43                 int write(char *, unsigned);
  44                 int read(char *, unsigned);
  45         private:
  46                 int fd[2];
  47
  48                 int get_fd() { return fd[0]; }
  49         };
  50
  51         Application &app;
  52         Pipe        pipe;
  53         unsigned    next_id;
  54         std::list<Event> events;
  55
  56         void data_available(short);
  57 };
  58
  59 } // namespace Msp
  60
  61 #endif