trezor-firmware/src/apps/homescreen/homescreen.py

from trezor import ui, res
from trezor.ui.swipe import Swipe, degrees
from apps.common import storage


async def homescreen():
    while True:
        await ui.backlight_slide(ui.BACKLIGHT_DIM)
        display_homescreen()
        await ui.backlight_slide(ui.BACKLIGHT_NORMAL)
        await swipe_to_rotate()


def display_homescreen():
    if not storage.is_initialized():
        label = 'Go to trezor.io/start'
        image = None
    else:
        label = storage.get_label() or 'My TREZOR'
        image = storage.get_homescreen()

    if not image:
        image = res.load('apps/homescreen/res/bg.toif')

    if storage.is_initialized() and storage.needs_backup():
        ui.display.bar(0, 0, ui.WIDTH, 30, ui.YELLOW)
        ui.display.text_center(120, 22, 'NEEDS BACKUP!', ui.BOLD, ui.BLACK, ui.YELLOW)
        ui.display.bar(0, 30, ui.WIDTH, ui.HEIGHT - 30, ui.BG)
    else:
        ui.display.bar(0, 0, ui.WIDTH, ui.HEIGHT, ui.BG)
    ui.display.avatar(48, 48 - 10, image, ui.WHITE, ui.BLACK)
    ui.display.text_center(120, 220, label, ui.BOLD, ui.FG, ui.BG)


async def swipe_to_rotate():
    swipe = await Swipe(absolute=True)
    ui.display.orientation(degrees(swipe))