无法正确调整小部件的大小

Question

在我正在创建的应用程序中，我有一个包含几个屏幕实例的屏幕管理器。在其中一个中，我希望有 2 个标准小部件和一些由用户动态添加的按钮。如果这些按钮太多，用户应该能够滚动它们直到找到他想要的那个。

为了实现这一点，我使用了一个包含两个对象的网格布局：另一个网格布局和一个滚动视图。网格布局负责 2 个标准小部件（文本输入和按钮）。滚动视图负责动态添加的按钮。

我希望滚动视图部分占据窗口的较大部分（比如 75%），以便用户可以更清楚地看到按钮，并且带有 2 个标准小部件的网格布局应该占据剩余部分。然而，gridlayout 最终占据了窗口的大部分。

这是一段代码（假设现在动态添加的按钮是 15 个）：

sm = ScreenManager()

class scr1(Screen):
    pass

#layout that occupies the entire window. Everything else will be added on this
glayout = GridLayout(cols=1)

#layout that should occupy 25% of the window
layout1 = GridLayout(cols=1,size_hint_y=0.25)

#layout to be added on the scrollview 
layout2 = GridLayout(cols=1,size_hint_y=None)
layout2.bind(minimum_height=layout2.setter('height'))

#screen to hold the glayout
screen1 = scr1(name = '1')

#adding a couple of widgets to layout1
layout1.add_widget(Button(text = 'hey'))
layout1.add_widget(TextInput(text = 'hey'))

#scroller that should occupy 75% of the window
scroller = ScrollView(size_hint = (1,None))
scroller.add_widget(layout2)

#adding buttons to be scrolled 
for i in range(15):
    layout2.add_widget(Button(text=str(i),size_hint_y=None))

#adding scroller and layout1 to glayout and then the glayout to the screen
glayout.add_widget(scroller)
glayout.add_widget(layout1)
screen1.add_widget(glayout)

#adding the screen to the screen manager
sm.add_widget(screen1)    

我对kivy使用的定位系统不是很熟悉，我不知道我应该如何解决这个问题。这是我运行程序时的样子。

Answer 1

您将 ScrollView 的 size_hint_y 设置为 None。

from kivy.uix.screenmanager import Screen, ScreenManager
from kivy.uix.gridlayout import GridLayout
from kivy.uix.scrollview import ScrollView
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
sm = ScreenManager()

class scr1(Screen):
    pass

#layout that occupies the entire window. Everything else will be added on this
glayout = GridLayout(cols=1)

#layout that should occupy 25% of the window
layout1 = GridLayout(cols=1,size_hint_y=0.25)

#layout to be added on the scrollview 
layout2 = GridLayout(cols=1,size_hint_y=None)
layout2.bind(minimum_height=layout2.setter('height'))

#screen to hold the glayout
screen1 = scr1(name = '1')

#adding a couple of widgets to layout1
layout1.add_widget(Button(text = 'hey'))
layout1.add_widget(TextInput(text = 'hey'))

#scroller that should occupy 75% of the window
scroller = ScrollView(size_hint_y=.75)
scroller.add_widget(layout2)

#adding buttons to be scrolled 
for i in range(15):
    layout2.add_widget(Button(text=str(i),height=70,size_hint_y=None))

#adding scroller and layout1 to glayout and then the glayout to the screen
glayout.add_widget(scroller)
glayout.add_widget(layout1)
screen1.add_widget(glayout)

#adding the screen to the screen manager
sm.add_widget(screen1)
from kivy.app import App

class Ap(App):
    def build(self):
        return sm

Ap().run()