How do you scroll a GridLayout inside Kivy ScrollView?

Question

At the moment this is my kv code that is not scrollable:

BoxLayout:
    id: bl
    orientation: \'vertical\'
    padding: 10, 10
    row_default_height: \'48         


        

Answer 1

According to the documentation for ScrollView you have to disable at least one of the ScrollView's child size_hint:

<Controller>:
    layout_content: layout_content
    BoxLayout:
        id: bl
        orientation: 'vertical'
        padding: 10, 10
        row_default_height: '48dp'
        row_force_default: True
        spacing: 10, 10
        ScrollView:
            size: self.size
            GridLayout:
                id: layout_content
                size_hint_y: None
                cols: 1
                row_default_height: '20dp'
                row_force_default: True
                spacing: 0, 0
                padding: 0, 0

                Label:
                    text: "Lorem ipsum dolor sit amet"

And bind the layout's size to adapt itself:

# main.py

class Controller(FloatLayout):
    layout_content=ObjectProperty(None)

    def __init__(self, **kwargs):
        super(Controller, self).__init__(**kwargs)
        self.layout_content.bind(minimum_height=self.layout_content.setter('height'))

Answer 2

works and fixes issue of scrollview not resizing length with window when maximized. No kv for those needing it without

kivy.require('1.11.1')
      
class ScrollTest(ScrollView):
    def __init__(self,**kwargs):
        super().__init__(**kwargs)
    
        Window.bind(on_maximize=self.testing)
        
        self.size_hint = (1,None)
        self.pos_hint = {'center_x':0.5,'top': 1}
        self.size = (Window.width,Window.height)

        self.inside = GridLayout()
        self.inside.cols = 1
        self.inside.size_hint_y= None
        self.inside.spacing = 10
        
        self.inside.bind(minimum_height=self.inside.setter('height'))#checks when window maximized
        
        for i in range(1,5):
            self.submit = Button(text='something',size_hint_y=None, height=40)
            self.submit.bind(on_press=self.wPressed)
            self.inside.add_widget(self.submit)
        
        self.add_widget(self.inside)
        
    def wPressed(self,instance):
        self.submit = Button(text='something',size_hint_y=None, height=40)
        self.submit.bind(on_press=self.wPressed)
        self.inside.add_widget(self.submit)
            
    def testing(self,instance):
        self.size= (Window.width,Window.height)

        
class MyApp(App):
    def build(self):
        self.screen_manager = ScreenManager()
        
        '''Creation of login screen'''
        self.login_page = ScrollTest()
        screen = Screen(name= 'Login')
        screen.add_widget(self.login_page)
        self.screen_manager.add_widget(screen)
        
        return self.screen_manager


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