base/EventManager.lua

   1 --this handles the events
   2 EventManager = {}
   3
   4
   5 --create the resource managers
   6 EventManager.keyboard = {}
   7 EventManager.keyboard.pressed = {}
   8 EventManager.keyboard.released = {}
   9
  10
  11 EventManager.mouse = {}
  12 EventManager.mouse.motion = nil
  13 EventManager.mouse.pressed = {}
  14 EventManager.mouse.released = {}
  15
  16
  17 --joystick handling is inherently difficult because there can be multiple joysticks
  18 --thus, instead of having it be that the axis/button/etc... is the index for each,
  19 -- the index is the joystick that the event originates from.
  20 EventManager.joystick = {}
  21 EventManager.joystick.axis_motion = {}
  22 EventManager.joystick.ball_motion = {}
  23 EventManager.joystick.hat_motion = {}
  24 EventManager.joystick.pressed = {}
  25 EventManager.joystick.released = {}
  26
  27 --misc events
  28 EventManager.quit = nil
  29
  30
  31 --state variables
  32 EventManager.type = 0
  33 EventManager.state = 0
  34 EventManager.arg1 = 0
  35 EventManager.arg2 = 0
  36 EventManager.arg3 = 0
  37 EventManager.arg4 = 0
  38
  39
  40 --constructor
  41 function EventManager:new(o)
  42   o = o or {}
  43   setmetatable(o, self)
  44   self.__index = self
  45   return o
  46 end
  47
  48
  49 --gets and evaluates events
  50 function EventManager:gather_events()
  51
  52   self.type, self.state, self.arg1, self.arg2, self.arg3, self.arg4 = get_event()
  53
  54   while (self.type ~= 0) do
  55
  56     --keyboard handling
  57     if self.type == "keyboard" then
  58       if self.keyboard[self.state][self.arg1] then self.keyboard[self.state][self.arg1]() end
  59
  60     --mouse handling
  61     elseif self.type == "mouse" then
  62       if self.state == "motion" then
  63         if self.mouse.motion then self.mouse.motion(self.arg1, self.arg2, self.arg3, self.arg4) end
  64       else
  65         if self.mouse[self.state][self.arg1] then self.mouse[self.state][self.arg1](self.arg2, self.arg3) end
  66       end
  67
  68     --joystick handling
  69     elseif self.type == "joystick" then
  70       if self.state == "axis_motion" then
  71         if self.joystick.axis_motion[self.arg1] then self.joystick.axis_motion[self.arg1](self.arg2, self.arg3) end
  72       elseif self.state == "ball_motion" then
  73         if self.joystick.ball_motion[self.arg1] then self.joystick.ball_motion[self.arg1](self.arg2, self.arg3, self.arg4) end
  74       elseif self.state == "hat_motion" then
  75         if self.joystick.hat_motion[self.arg1] then self.joystick.hat_motion[self.arg1](self.arg2, self.arg3) end
  76       else
  77         if self.joystick[self.state][self.arg1] then self.joystick[self.state][self.arg1](self.arg2) end
  78       end
  79
  80     --misc events
  81     elseif self.type == "quit" then
  82       if self.quit then self.quit() end
  83     end
  84
  85     self.type, self.state, self.arg1, self.arg2, self.arg3, self.arg4 = get_event()
  86   end
  87
  88 end