Dropdown Selector

# Dropdown Select in Canvas
# Author: Joe
# 09/12/2014
# note: this is just an example, not a module

import appuifw as A
import graphics as G

run=1
def exit():
 global run
 run=0
A.app.exit_key_handler=exit
img=G.Image.new(G.sysinfo.display_pixels())

class Dropdown:
 def __init__(self,items=[]):
  self.cur,self.page,self.offset=0,0,6
  self.state=1
  self.items=items
  self.selected=None
  self.c=A.Canvas(redraw_callback=self.redraw)
  A.app.screen='full'
  A.app.body=self.c

 def redraw(self,rect):
  if img:
   self.c.blit(img)

 def down(self):
  if not self.state:
   if self.page*self.offset+self.cur<len(self.items)-1 and self.cur<self.offset-1:
    self.cur+=1
   else:
    if len(self.items)-1>self.page*self.offset+self.cur and self.cur==self.offset-1:
     self.page=self.page+1
     self.cur=0

 def up(self):
  if not self.state:
   if self.cur>0:
    self.cur-=1
    if self.cur<0:self.state=1
   else:
    if self.page>0:
     self.page=self.page-1
     self.cur=self.offset-1

 def select(self):
  if self.state:self.state=0
  else:self.state=1
  self.selected=self.items[self.page * self.offset+self.cur]

 def show(self):
  self.c.bind(50,self.up)
  self.c.bind(56,self.down)
  self.c.bind(53,self.select)
  px,py,th=15,30,14
  bw=max([len(s) for s in self.items])+100
  while run:
   img.clear(0x363636)
   if not self.state:
    if len(self.items)-self.page*self.offset<self.offset:mx=len(self.items)-self.page*self.offset
    else:mx=self.offset
    img.rectangle((px-5,py-(th-2),px+bw,py+mx*th+4),0xdadada,0xfcfcfc)
    img.line((px-5,py+2,px+bw,py+2),0xeeeeee)
    img.polygon((px+bw-2,py-(th-4), px+bw-8, py, px+bw-14, py-(th-4)),fill=0)
    img.rectangle((px-3,py+self.cur*th+2,px+bw-2,py+self.cur*th+th+4),fill=0xefefef)
    for index in range(0,mx):
     img.text((px,py+index*th+th),self.items[index+self.page*self.offset],0)
   else:
    img.rectangle((px-5,py-(th-2),px+bw,py+4),0xdadada,0xfcfcfc)
    img.polygon((px+bw-2,py-(th-4), px+bw-8, py, px+bw-14, py-(th-4)),fill=0)
    img.text((px,py),(u'Silahkan Pilih',self.selected)[self.selected!=None],0)

   img.text((px-5,py-15),u'Menu:',0xdadada)
   img.text((px-5,186),u'Dropdown Selector',0xdadada)
   img.text((px-5,200),u'Scroll: (%d/%d) / Item: %s' %(self.page+1,(len(self.items)//self.offset)+1,(u'Belum dipilih',self.page*self.offset+self.cur) [self.selected!=None]),0xdadada)
   self.redraw(0)
   A.e32.ao_sleep(0)

menu=[u'Item %d' %i for i in range(10)]
dd=Dropdown(menu)
dd.show()