Python - ウィジェット(イベント、TextInputクラス(multiline属性、text属性、on_text_validateメソッド、日本語入力)、Buttonクラス(on_pressメソッド)、Labelクラス)

Kivyプログラミング
―Pythonで作るマルチタッチアプリ―
楽天ブックス(Kobo) Yahoo!

開発環境

macOS Mojave - Apple (OS)
Emacs (Text Editor)
Windows 10 Pro (OS)
Visual Studio Code (Text Editor)
Python 3.7 (プログラミング言語)
Kivy (パッケージ)

Kivyプログラミング ―Pythonで作るマルチタッチアプリ― (実践Pythonライブラリー) (原口和也(著)、久保幹雄(監修)、朝倉書店)の2(ウィジェット)、2.5(演習問題)、演習2.4を取り組んでみる。

コード(Emacs)

Python 3

#!/usr/bin/env python3
from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.core.text import LabelBase, DEFAULT_FONT

LabelBase.register(DEFAULT_FONT, 'NotoSansCJKjp-Regular.otf')


class MyTextInput(TextInput):
    def __init__(self, *args, **kwargs):
        TextInput.__init__(self, *args, **kwargs)
        self.multiline = False

    def on_text_validate(self):
        print('on_text_validate(TextInput)')
        label = self.parent.children[1]
        label.text = self.text


class MyButton(Button):
    def __init__(self, *args, **kwargs):
        Button.__init__(self, *args, **kwargs)
        self.current_color_index = 0

    def on_press(self):
        print('on_press(Button)')
        colors = [('白', (1, 1, 1, 1)),
                  ('青', (0, 0, 1, 1)),
                  ('赤', (1, 0, 0, 1))]
        label = self.parent.children[1]
        self.current_color_index = (self.current_color_index + 1) % 3
        _, color_rgba = colors[self.current_color_index]
        color_name, _ = colors[(self.current_color_index + 1) % 3]
        self.text = color_name
        label.color = color_rgba


class SampleApp(App):
    def build(self):
        boxlayout = BoxLayout(orientation='vertical')
        text_input = MyTextInput(text='I love python+kivy!')
        label = Label(text='I love python+kivy!')
        button = MyButton(text='青')
        for widget in [text_input, label, button]:
            boxlayout.add_widget(widget)
        return boxlayout


if __name__ == '__main__':
    SampleApp().run()

入出力結果(Terminal, cmd(コマンドプロンプト), Jupyter(IPython))

$ ./sample4.py
[INFO   ] [Logger      ] Record log in /~/.kivy/logs/kivy_18-12-24_19.txt
[INFO   ] [Kivy        ] v1.10.1
[INFO   ] [Python      ] v3.7.1 (default, Oct 21 2018, 09:01:26) 
[Clang 10.0.0 (clang-1000.11.45.2)]
[INFO   ] [Factory     ] 194 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_imageio, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [Window      ] Provider: sdl2
[INFO   ] [GL          ] Using the "OpenGL ES 2" graphics system
[INFO   ] [GL          ] Backend used <gl>
[INFO   ] [GL          ] OpenGL version <b'2.1 INTEL-12.4.7'>
[INFO   ] [GL          ] OpenGL vendor <b'Intel Inc.'>
[INFO   ] [GL          ] OpenGL renderer <b'Intel(R) Iris(TM) Pro Graphics 6200'>
[INFO   ] [GL          ] OpenGL parsed version: 2, 1
[INFO   ] [GL          ] Shading version <b'1.20'>
[INFO   ] [GL          ] Texture max size <16384>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [GL          ] NPOT texture support is available
[INFO   ] [Base        ] Start application main loop
on_press(Button)
on_press(Button)
on_press(Button)
on_press(Button)
on_text_validate(TextInput)
on_press(Button)
on_text_validate(TextInput)
[INFO   ] [Base        ] Leaving application in progress...
$

TextInputクラスで日本語入力を直接出来るようにはまだ出来てない(他のアプリで入力してコピーアンドペーストなら可能)のでいずれ出来るようにしてみることに。その時までに、日本語ユーザーが増えて、Kivyが対応してくれることをちょっと期待。