wuttapos/wuttapos/controls/keyboard.py

# -*- coding: utf-8; -*-
################################################################################
#
#  WuttaPOS -- Pythonic Point of Sale System
#  Copyright © 2023 Lance Edgar
#
#  This file is part of WuttaPOS.
#
#  WuttaPOS is free software: you can redistribute it and/or modify it under the
#  terms of the GNU General Public License as published by the Free Software
#  Foundation, either version 3 of the License, or (at your option) any later
#  version.
#
#  WuttaPOS is distributed in the hope that it will be useful, but WITHOUT ANY
#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
#  details.
#
#  You should have received a copy of the GNU General Public License along with
#  WuttaPOS.  If not, see <http://www.gnu.org/licenses/>.
#
################################################################################
"""
WuttaPOS - keyboard control
"""

import flet as ft

from .base import WuttaControl


class WuttaKeyboard(WuttaControl):

    default_font_size = 20
    default_button_size = 80

    def __init__(self, *args, **kwargs):
        self.on_keypress = kwargs.pop('on_keypress', None)

        super().__init__(*args, **kwargs)

        self.caps_lock = False
        self.caps_map = dict([(k, k.upper())
                              for k in 'abcdefghijklmnopqrstuvwxyz'])

        self.shift = False
        self.shift_map = {
            '`': '~',
            '1': '!',
            '2': '@',
            '3': '#',
            '4': '$',
            '5': '%',
            '6': '^',
            '7': '&',
            '8': '*',
            '9': '(',
            '0': ')',
            '-': '_',
            '=': '+',
            '[': '{',
            ']': '}',
            '\\': '|',
            ';': ':',
            "'": '"',
            ',': '<',
            '.': '>',
            '/': '?',
        }

    def update_caps_lock(self, caps_lock):
        self.caps_lock = caps_lock

        if self.caps_lock:
            self.caps_key.bgcolor = 'blue'
        else:
            self.caps_key.bgcolor = None

        for key, button in self.keys.items():
            if key in self.caps_map:
                if self.caps_lock:
                    button.content.value = self.caps_map[key]
                else:
                    button.content.value = key

        self.update()

    def update_shift(self, shift):
        self.shift = shift

        if self.shift:
            self.shift_key.bgcolor = 'blue'
        else:
            self.shift_key.bgcolor = None

        for key, button in self.keys.items():
            if key in self.caps_map:
                if self.shift:
                    button.content.value = self.caps_map[key]
                else:
                    button.content.value = key
            elif key in self.shift_map:
                if self.shift:
                    button.content.value = self.shift_map[key]
                else:
                    button.content.value = key

        self.update()

    def simple_keypress(self, e):

        # maybe inform parent
        if self.on_keypress:
            key = e.control.content.value

            # avoid callback for certain keys
            if key not in ('CAPS', 'SHIFT'):

                # translate certain keys
                if key == 'SPACE':
                    key = ' '

                # let 'em know
                self.on_keypress(key)

        # turn off shift key if set
        if self.shift:
            self.update_shift(False)

    def build(self):
        self.keys = {}

        def make_key(key, data=None, on_click=self.simple_keypress,
                     width=self.default_button_size,
                     bgcolor=None):
            button = ft.Container(content=ft.Text(key, size=self.default_font_size,
                                                  weight=ft.FontWeight.BOLD),
                                  data=data or key,
                                  height=self.default_button_size,
                                  width=width,
                                  on_click=on_click,
                                  alignment=ft.alignment.center,
                                  border=ft.border.all(1, 'black'),
                                  border_radius=ft.border_radius.all(5),
                                  bgcolor=bgcolor,
                                  )
            self.keys[key] = button
            return button

        def caps_click(e):
            self.update_caps_lock(not self.caps_lock)

        self.caps_key = make_key('CAPS', on_click=caps_click)
        if self.caps_lock:
            self.caps_key.bgcolor = 'blue'

        def shift_click(e):
            self.update_shift(not self.shift)

        self.shift_key = make_key('SHIFT', on_click=shift_click)
        if self.shift:
            self.shift_key.bgcolor = 'blue'

        rows = [
            [make_key(k) for k in "`1234567890-="] + [make_key('⌫', bgcolor='yellow')],
            [make_key(k) for k in "qwertyuiop[]\\"],
            [self.caps_key] + [make_key(k) for k in "asdfghjkl;'"] + [make_key('⏎', bgcolor='blue')],
            [self.shift_key] + [make_key(k) for k in "zxcvbnm,./"],
            [make_key('SPACE', width=self.default_button_size * 5)],
        ]

        rows = [ft.Row(controls, alignment=ft.MainAxisAlignment.CENTER)
                for controls in rows]

        return ft.Container(
            content=ft.Column(
                rows,
            ),
        )