source/input/device.h

   1 #ifndef MSP_INPUT_INPUTDEVICE_H_
   2 #define MSP_INPUT_INPUTDEVICE_H_
   3
   4 #include <string>
   5 #include <vector>
   6 #include <stdexcept>
   7 #include <sigc++/signal.h>
   8
   9 namespace Msp {
  10 namespace Input {
  11
  12 class device_not_available: public std::runtime_error
  13 {
  14 public:
  15         device_not_available(const std::string &w): std::runtime_error(w) { }
  16         virtual ~device_not_available() throw() { }
  17 };
  18
  19
  20 /**
  21 Base class for input devices.  Input devices have two types of controls:
  22 buttons and axes.  Buttons are either on or off.  Axes have a floating point
  23 value nominally in the range [-1, 1].
  24
  25 Event handlers return a boolean indicating whether the event is considered
  26 processed.  If a handler returns true, no further handlers are invoked.
  27 */
  28 class Device
  29 {
  30 protected:
  31         struct EventAccumulator
  32         {
  33                 typedef void result_type;
  34
  35                 template<typename Iter>
  36                 result_type operator()(Iter begin, Iter end) const
  37                 {
  38                         for(Iter i=begin; i!=end; ++i)
  39                                 if(*i)
  40                                         return;
  41                 }
  42         };
  43
  44 public:
  45         sigc::signal<bool, unsigned>::accumulated<EventAccumulator> signal_button_press;
  46         sigc::signal<bool, unsigned>::accumulated<EventAccumulator> signal_button_release;
  47         sigc::signal<bool, unsigned, float, float>::accumulated<EventAccumulator> signal_axis_motion;
  48
  49 protected:
  50         std::string name;
  51         std::vector<char> buttons;
  52         std::vector<float> axes;
  53
  54         Device();
  55 public:
  56         virtual ~Device();
  57
  58         const std::string &get_name() const { return name; }
  59         bool get_button_state(unsigned) const;
  60         float get_axis_value(unsigned) const;
  61
  62         virtual std::string get_button_name(unsigned) const;
  63         virtual std::string get_axis_name(unsigned) const;
  64 protected:
  65         void set_button_state(unsigned, bool, bool);
  66         void set_axis_value(unsigned, float, bool);
  67 };
  68
  69 } // namespace Input
  70 } // namespace Msp
  71
  72 #endif