Powerbar

# powerbar
# joe, 2/01/2014

import appuifw as A
import graphics as G

class Keyboard(object):
 def __init__(self,onevent=lambda:None):
  self._keyboard_state={}
  self._downs={}
  self._onevent=onevent

 def handle_event(self,event):
  if event['type']==3:
   code=event['scancode']
   if not self.is_down(code):
    self._downs[code]=self._downs.get(code,0)+1
   self._keyboard_state[code]=1
  elif event['type']==2:
   self._keyboard_state[event['scancode']]=0
  self._onevent()

 def is_down(self,scancode):
  return self._keyboard_state.get(scancode,0)

 def pressed(self,scancode):
  if self._downs.get(scancode,0):
   self._downs[scancode]-=1
   return True
  return False

 def release(self,scancode):
  if self._downs.get(scancode,0):
   self._downs[scancode]-=2
   return True
  return False


class Bar:
 def __init__(self):
  self.w,self.max=10,150
  self.v=0

 def update(self):
  self.v+=1
  if self.v>self.max-1:self.v=self.max

 def full(self):
  self.v=0

 def draw(self,g):
  px,py=5,H-5
  g.rectangle((px-1,py-self.max-1,px+self.w+1,py+1),0xffffff)
  g.rectangle((px,py-(self.max-self.v),px+self.w,py),fill=0x00ee00)


class App:
 def __init__(self):
  self.run=0
  A.app.screen='full'
  self.c = A.Canvas(redraw_callback=self.redraw,event_callback=kb.handle_event)
  A.app.body=self.c
  A.app.exit_key_handler = self.stop

 def stop(self):
  self.run=0

 def redraw(self,x):
  if bg:
   self.c.blit(bg)

 def play(self):
  self.run=1
  while self.run:
   bg.clear(0)
   bg.text((25,H-8),u'Pow: %s' %(bar.v,'Maximum')[bar.v==bar.max],0xffffff)
   bar.draw(bg)
   self.redraw(0)
   A.e32.ao_sleep(1e-04)
   if kb.is_down(0x38):
    bar.update()
   elif kb.release(0x38):
    bar.full()



W,H=G.sysinfo.display_pixels()
bg=G.Image.new((W,H))

kb=Keyboard()
bar=Bar()
App().play()