如何在 Kivy 上创建可滚动的浮动布局？

Question

I want to create a scrollable floatlayout .

I found this code on the internet, to create a scrollable Gridlayout :

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.floatlayout import FloatLayout
from functools import partial
from kivy.uix.scrollview import ScrollView
from kivy.uix.slider import Slider
from kivy.uix.button import Button

class Board(FloatLayout):
    def __init__(self, **kwargs):
        super(Board, self).__init__(**kwargs)
        scrlv = ScrollView(size_hint=(0.9,0.95))
        layout2 = GridLayout(cols=1, size_hint_y=None)
        layout2.bind(minimum_height=layout2.setter('height'))
        scrlv.add_widget(layout2)
        s = Slider(min=0, max=1, value=25, orientation='vertical', step=0.01, size_hint=(0.1, 0.95))
        scrlv.bind(scroll_y=partial(self.slider_change, s))
        s.bind(value=partial(self.scroll_change, scrlv))

        self.add_widget(scrlv)
        self.add_widget(s)


        for i in range(1, 301):
            btn = Button(text=str(i), size_hint_y=None, height=60, valign='middle', font_size=12)
            btn.text_size = (btn.size)
            layout2.add_widget(btn)


    def scroll_change(self, scrlv, instance, value):
        scrlv.scroll_y = value

    def slider_change(self, s, instance, value):
        if value >= 0:
            s.value = value

class TestApp(App):
    def build(self):
        self.title = 'Test'
        return Board()


TestApp().run()

It works fine, but when i tried to convert it into floatlayout like this:

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.floatlayout import FloatLayout
from functools import partial
from kivy.uix.scrollview import ScrollView
from kivy.uix.slider import Slider
from kivy.uix.button import Button

class Board(FloatLayout):
    def __init__(self, **kwargs):
        super(Board, self).__init__(**kwargs)
        scrlv = ScrollView(size_hint=(0.9, 0.95))
        layout2 = FloatLayout(size_hint_y=None)
        layout2.bind(minimum_height=layout2.setter('height'))
        scrlv.add_widget(layout2)
        s = Slider(min=0, max=1, value=25, orientation='vertical', step=0.01, size_hint=(0.1, 0.95))
        scrlv.bind(scroll_y=partial(self.slider_change, s))
        s.bind(value=partial(self.scroll_change, scrlv))

        self.add_widget(scrlv)
        self.add_widget(s)


        for i in range(1, 301):
            btn = Button(text=str(i), size_hint_y=None, height=60, valign='middle', font_size=12)
            btn.text_size = (btn.size)
            btn.y = 100 - (60*i)
            layout2.add_widget(btn)


    def scroll_change(self, scrlv, instance, value):
        scrlv.scroll_y = value

    def slider_change(self, s, instance, value):
        if value >= 0:
            s.value = value

class TestApp(App):
    def build(self):
        self.title = 'Test'
        return Board()


TestApp().run()

It didn't work and i got this error:

layout2.bind(minimum_height=layout2.setter('height'))
   File "kivy\_event.pyx", line 427, in kivy._event.EventDispatcher.bind
 KeyError: 'minimum_height'

I read about it on the internet and i'm understand that floatlayout doesn't have the attribute "minimum_height", but i don't know what can i replace it with. Any suggestions?

Answer 1

To make the FloatLayout scroll:

• Set its size_hint to None, None
• Set its size to something larger than the ScrollView