from native import app

prev

def OnStart():
    global lay
    app.DisableKeys( "VOLUME_DOWN,VOLUME_UP" )

    lay = app.CreateLayout( "Linear", "FillX" )
    lay.SetPadding( 0, .85 )
    lay.Hide()

    img = app.CreateImage( "/Sys/Img/Hello.png", -1, .3 )
    lay.AddChild( img )

    app.AddLayout( lay )

    app.ShowPopup( "Press the volume keys!" )
    app.SetOnKey( OnKey )

def OnKey(action, name, code, extra):
    if action != prev:
        if action == "Down":
            lay.Animate( "SlideFromBottom", None, 300 )
        if action == "Up":
            lay.Animate( "SlideToBottom" , None, 300 )
    prev = action