Kivy focusable widgets

focusable_widgets.py

# coding=utf-8
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.checkbox import CheckBox
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.lang import Builder

Builder.load_string("""
#:import rgb kivy.utils.get_color_from_hex
<FocusableCheckBox,FocusableButton,FocusableTextInput>:
    canvas.before:
        Color:
            rgba: rgb("#3bb1dd")[:3] + [.5 if self.focus else 0]
        Line:
            width: sp(1)
            rectangle: self.x, self.y, self.width, self.height
        Color:
            rgb: 0, 0, 0

<FocusableTextInput>:
    write_tab: False
    canvas.before:
        Color:
            rgba: self.disabled_foreground_color if self.disabled else (self.hint_text_color if not self.text and not self.focus else self.foreground_color)
""")


class FocusableTextInput(TextInput):
    pass


class FocusableCheckBox(FocusBehavior, CheckBox):
    def keyboard_on_key_down(self, window, keycode, text, modifiers):
        key = keycode[-1]
        if key in ("spacebar", "enter"):
            self.active = not self.active
        return super(FocusableCheckBox, self).keyboard_on_key_down(window, keycode, text, modifiers)


class FocusableButton(FocusBehavior, Button):
    def keyboard_on_key_down(self, window, keycode, text, modifiers):
        key = keycode[-1]
        if key in ("spacebar", "enter"):
            self.trigger_action()
        return super(FocusableButton, self).keyboard_on_key_down(window, keycode, text, modifiers)