#!/usr/bin/env python
import fs_driver
import sys

class Lv_Roller_3():

		def __init__(self):
		self.mask_top_id = -1
						   self.mask_bottom_id = -1

#
# Add a fade mask to roller.
#
								   style = lv.style_t()
										   style.init()
										   style.set_bg_color(lv.color_black())
										   style.set_text_color(lv.color_white())

										   lv.scr_act().add_style(style, 0)

										   roller1 = lv.roller(lv.scr_act())
												   roller1.add_style(style, 0)
												   roller1.set_style_border_width(0, 0)
												   roller1.set_style_pad_all(0, 0)
												   roller1.set_style_bg_opa(lv.OPA.TRANSP, lv.PART.SELECTED)

#if LV_FONT_MONTSERRAT_22
#    lv_obj_set_style_text_font(roller1, &lv_font_montserrat_22, LV_PART_SELECTED);
#endif
												   try:
													   roller1.set_style_text_font(lv.font_montserrat_22, lv.PART.SELECTED)
													   except:
													   fs_drv = lv.fs_drv_t()
															   fs_driver.fs_register(fs_drv, 'S')
															   print("montserrat-22 not enabled in lv_conf.h, dynamically loading the font")
															   font_montserrat_22 = lv.font_load("S:" + "../../assets/font/montserrat-22.fnt")
																	   roller1.set_style_text_font(font_montserrat_22, lv.PART.SELECTED)

																	   roller1.set_options("\n".join([
																	"January",
																	"February",
																	"March",
																	"April",
																	"May",
																	"June",
																	"July",
																	"August",
																	"September",
																	"October",
																	"November",
																	"December"]), lv.roller.MODE.NORMAL)

																	   roller1.center()
																	   roller1.set_visible_row_count(3)
																	   roller1.add_event_cb(self.mask_event_cb, lv.EVENT.ALL, None)

																	   def mask_event_cb(self, e):

																	   code = e.get_code()
																			   obj = e.get_target()

																					   if code == lv.EVENT.COVER_CHECK:
																					   e.set_cover_res(lv.COVER_RES.MASKED)

																						   elif code == lv.EVENT.DRAW_MAIN_BEGIN:
# add mask
																						   font = obj.get_style_text_font(lv.PART.MAIN)
																								   line_space = obj.get_style_text_line_space(lv.PART.MAIN)
																										   font_h = font.get_line_height()

																												   roller_coords = lv.area_t()
																														   obj.get_coords(roller_coords)

																														   rect_area = lv.area_t()
																																   rect_area.x1 = roller_coords.x1
																																		   rect_area.x2 = roller_coords.x2
																																				   rect_area.y1 = roller_coords.y1
																																						   rect_area.y2 = roller_coords.y1 + (obj.get_height() - font_h - line_space) // 2

																																								   fade_mask_top = lv.draw_mask_fade_param_t()
																																										   fade_mask_top.init(rect_area, lv.OPA.TRANSP, rect_area.y1, lv.OPA.COVER, rect_area.y2)
																																										   self.mask_top_id = lv.draw_mask_add(fade_mask_top, None)

																																												   rect_area.y1 = rect_area.y2 + font_h + line_space - 1
																																														   rect_area.y2 = roller_coords.y2

																																																   fade_mask_bottom = lv.draw_mask_fade_param_t()
																																																		   fade_mask_bottom.init(rect_area, lv.OPA.COVER, rect_area.y1, lv.OPA.TRANSP, rect_area.y2)
																																																		   self.mask_bottom_id = lv.draw_mask_add(fade_mask_bottom, None)

																																																				   elif code == lv.EVENT.DRAW_POST_END:
																																																				   fade_mask_top = lv.draw_mask_remove_id(self.mask_top_id)
																																																						   fade_mask_bottom = lv.draw_mask_remove_id(self.mask_bottom_id)
# Remove the masks
																																																								   lv.draw_mask_remove_id(self.mask_top_id)
																																																								   lv.draw_mask_remove_id(self.mask_bottom_id)
																																																								   self.mask_top_id = -1
																																																										   self.mask_bottom_id = -1

																																																												   roller3 = Lv_Roller_3()
