kivyでButtonを押したときに別のBoxLayoutを開きたい

kivy

kivyでButtonを押したときに別のBoxLayoutを開きたいです
(MainScreenとSubScreenの切り替えをButto'Hello'とButton'Today?'で行いたい)

<MainScreen> Button: text: 'Hello' on_press: ********** 　　　# ここのコーディングがわかりません


from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button

from kivy.lang.builder import Builder

Builder.load_string('''
<MainScreen>:
    orientation: 'horizontal'
    Button:
        text: 'Hello'
        on_press: **************
    Button:
        text: 'everyone'

<SubScreen>:
    orientation: 'vertical'
    Button:
        text: 'How'
    Button:
        text: 'are'
    Button:
        text: 'you'
    Button:
        text: 'today?'
        on_press: **************
''')

class MainScreen(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

class SubScreen(BoxLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

class MainApp(App):
    def build(self):
        hoge = True
        #hoge = False

        if hoge:
            return MainScreen()
        else:
            return SubScreen()

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

よろしくお願いいたします

行動規範の内容に同意します

回答2件

自己解決

kivyのリファレンスのコードを参考に、直してみました。

from
1from kivy.uix.boxlayout import BoxLayout
2from kivy.uix.button import Button
3from kivy.uix.screenmanager import ScreenManager, Screen
4
5from kivy.lang.builder import Builder
6
7Builder.load_string('''
8<MainScreen>:
9    BoxLayout:
10        orientation: 'horizontal'
11        Button:
12            text: 'Hello'
13            on_press:
14                root.manager.transition.direction='right'
15                root.manager.current = 'second'
16
17        Button:
18            text: 'everyone'
19            on_press:
20                root.manager.transition.direction='left'
21                root.manager.current = 'second'
22<SubScreen>:
23    BoxLayout:
24        orientation: 'vertical'
25        Button:
26            text: 'How'
27            on_press:
28                root.manager.transition.direction='up'
29                root.manager.current = 'first'
30        Button:
31            text: 'are'
32            on_press:
33                root.manager.transition.direction='left'
34                root.manager.current = 'first'
35        Button:
36            text: 'you'
37            on_press:
38                root.manager.transition.direction='right'
39                root.manager.current = 'first'
40
41        Button:
42            text: 'today?'
43            on_press:
44                root.manager.transition.direction='down'
45                root.manager.current = 'first'
46''')
47
48
49class MainScreen(Screen):
50    pass
51    
52class SubScreen(Screen):
53    pass
54
55sm = ScreenManager()
56sm.add_widget(MainScreen(name= 'first'))
57sm.add_widget(SubScreen(name= 'second'))
58
59class MainApp(App):
60    def build(self):
61            return sm
62
63if __name__=='__main__':
64    MainApp().run()