show.py

import string
from talon.voice import Context
from talon import canvas
from talon import ui
from talon.skia import Rect

ctx = Context('show')
alphabet_context = Context('alphabet_context')

# font size of the overlay
font_size = 18
# left padding of the font in the overlay
padding_left = 20


def draw_alphabet(canvas):
    paint = canvas.paint
    paint.textsize = font_size
    paint.color = '333'
    paint.style = paint.Style.FILL
    canvas.draw_rect(Rect(canvas.x, canvas.y, canvas.width, canvas.height))

    line_height = paint.get_fontmetrics(1.5)[0]

    paint.color = 'dedede'

    try:
        from user import std
        alnum = std.alpha_alt
    except:
        # TODO log an error
        alnum = []

    num = 1
    for k, v in zip(alnum, string.ascii_lowercase):
        canvas.draw_text('%s - %s' % (k, v), canvas.x + padding_left, canvas.y + (num * line_height))
        num += 1


# initialize the overlay
screen = ui.main_screen()
w, h = screen.width, screen.height

x_position = w / 3
y_position = h / 4
x_dimension = w / 6
y_dimension = h / 1.5

panel = canvas.Canvas(x_position, y_position, x_dimension, y_dimension)
panel.register('draw', draw_alphabet)
panel.hide()


def show_alphabet(_):
    global alphabet_context

    panel.show()
    panel.freeze()

    keymap = {
        '(0 | exit | escape)': lambda x: close_alphabet(),
    }

    alphabet_context.keymap(keymap)
    alphabet_context.load()


def close_alphabet():
    panel.hide()
    alphabet_context.unload()


keymap = {
    'show alphabet': show_alphabet,
}

ctx.keymap(keymap)