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