kivy 滚动视图不工作

Question

我正在尝试在 EmployeeScreen class 中使用 kivy scrollview。它不会滚动！？我究竟做错了什么？我希望这不是重复的，请帮忙。我去了这个link。这似乎是与 kivy scrollview 不滚动相关的唯一问题。这并没有解决我的问题。

.py 文件：

`from kivy.app import App

from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
from kivy.uix.scrollview import ScrollView


from kivy.uix.boxlayout import BoxLayout
from kivy.uix.stacklayout import StackLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.gridlayout import GridLayout


class LogInScreen(Screen):
    pass
class EmployeeScreen(Screen):
    pass

class Manager(ScreenManager):
    login_screen = ObjectProperty(None)
    employee_screen = ObjectProperty(None)


class CptApp(App):
    icon = 'Images\login\cptlogo.png'
    title = 'CPT'
    def build(self):
        return Manager()


if __name__=='__main__':
    CptApp().run()`

.kv 文件：

<Manager>:
id: screen_manager

login_screen: login_screen
employee_screen: employee_screen


LogInScreen:
    id: login_screen
    name: 'login'
    manager: screen_manager

    FloatLayout:
        StackLayout:
            orientation: 'lr-tb'
            canvas:
                Color:
                    rgba: 1,1,1,1
                Rectangle:
                    pos: self.pos
                    size: self.size
            Image:
                size_hint_y: .1
                source: 'Images\login\cptbanner.jpg'
                allow_stretch: True
                keep_ratio: True

            Image: 
                source: 'Images\login\HD7Brw.jpg'
                allow_stretch: True
                keep_ratio: False

    Label:
        size_hint_y: .05
        size_hint_x: .5
        pos_hint: {"x": .25, "y": .7}
        markup: True
        text: '[i][b][color=#000000]USER NAME[/color][/b][/i]'

    TextInput:
        id: 'username_input'
        multiline: False
        size_hint_x: .4
        size_hint_y: .05
        pos_hint: {"x": .3, "y": .65}

    Label:
        size_hint_y: .05
        size_hint_x: .5
        markup: True
        text: '[i][b][color=#000000]PASSWORD[/color][/b][/i]'
        pos_hint: {'x': .25, 'y': .5}

    TextInput:
        id: 'password_input'
        multiline: False
        password: True
        size_hint_x: .4
        size_hint_y: .05
        pos_hint: {'x': .3, 'y': .45}

    Image:
        source: 'Images/login/loginbutton.png'
        size_hint_x: .25
        size_hint_y: .1
        pos_hint: {'x': .375, 'y': .25}

    Button:
        id: 'login_button'
        background_color: 0,0,0,0
        markup: True
        text: '[i][b][color=#000000]LOGIN[/color][/b][/i]'
        size_hint_x: .25
        size_hint_y: .1
        pos_hint: {'x': .375, 'y': .25} 
        on_release: screen_manager.current = 'employeescreen'

EmployeeScreen:
    id: employee_screen
    name: 'employeescreen'
    manager: screen_manager

    StackLayout:
        orientation: 'lr-tb'
        canvas:
            Color:
                rgba: 1,1,1,1
            Rectangle:
                pos: self.pos
                size: self.size
        Image:
            size_hint_y: .1
            source: 'Images\login\cptbanner.jpg'
            allow_stretch: True
            keep_ratio: True

        ScrollView:
            do_scroll_x: False
            size: root.size
            pos: root.pos
            GridLayout:
                cols: 2
                size_hint_y: None
                height: self.minimum_height
                pos: root.pos

                Button:
                    height: 40
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'
                Button:
                    size_hint_x: 1
                    size_hint_y: None
                    text: 'TEST'

Answer 1

我试图在我的 .kv 文件中使用 GridLayout，错了，我必须创建一个 class 并覆盖它的 init。

class MyLayout(GridLayout):
    def __init__(self,**kwargs):
        super(MyLayout,self).__init__(**kwargs)
        self.size_hint_y = (None)
        self.bind(minimum_height = self.setter('height'))

然后我将 class 放在 GridLayout 所在的 .kv 文件中。

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