Python - KV言語(id、参照、ウィジェット(Imageクラス(source属性)、Buttonクラス(text属性、on_pressメソッド)、BoxLayout(orientation属性、高さ(相対座標、size_hint_y属性))))

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4(KV言語)、4.5(演習問題)、演習4.2の解答を求めてみる。

コード

Python 3

#!/usr/bin/env python3
from kivy.app import App
# 日本語用
from kivy.core.text import LabelBase, DEFAULT_FONT
LabelBase.register(DEFAULT_FONT, 'NotoSansCJKjp-Regular.otf')


class Sample2App(App):
    pass


Sample2App().run()

KV言語

BoxLayout:
    orientation: 'vertical'
    Image:
        size_hint_y: 0.8
        id: image
    BoxLayout:
        size_hint_y: 0.2
        Button:
            text: '建物'
            on_press: image.source = 'building.jpg'; print(self)
        Button:
            text: '銀座'
            on_press: image.source = 'ginza.jpg'; print(self)
        Button:
            text: 'kamimura'
            on_press: image.source = 'kamimura.png'; print(self)

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

$ python3 sample2.py
[INFO   ] [Logger      ] Record log in ...
[INFO   ] [Kivy        ] v1.10.1
[INFO   ] [Python      ] v3.7.2 (default, Dec 30 2018, 08:55:50) 
[Clang 10.0.0 (clang-1000.11.45.5)]
[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   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
<kivy.uix.button.Button object at 0x10dca28d0>
<kivy.uix.button.Button object at 0x11336fa70>
<kivy.uix.button.Button object at 0x11336fad8>
<kivy.uix.button.Button object at 0x10dca28d0>
[INFO   ] [Base        ] Leaving application in progress...
$