# Copyright (c) 2007 Jurgen Scheible
# volume control, use up and down arrow keys to lower or increase the volume

import appuifw, key_codes, e32, audio

S = audio.Sound.open("E:\\Python\\midi\\volsound.mid")

def playsound():
    S.play(30,0)
    
def VolUp():
    highest = S.max_volume()
    current = S.current_volume()
    if current < highest:
        volume = current + highest/10
        S.set_volume(volume)

def VolDown():
    highest = S.max_volume()
    current = S.current_volume()
    if current > 0:
        volume = current - highest/10
        S.set_volume(volume)

def keys(event):
    if event['keycode'] == key_codes.EKeyUpArrow: VolUp()
    if event['keycode'] == key_codes.EKeyDownArrow: VolDown()

def quit():
    S.stop()
    S.close()
    app_lock.signal()
    appuifw.app.set_exit()

appuifw.app.body = canvas =appuifw.Canvas(event_callback=keys)
appuifw.app.title = u"Volume control"
appuifw.app.exit_key_handler = quit
playsound()
app_lock = e32.Ao_lock()
app_lock.wait()