How to use the kivy.uix.boxlayout.BoxLayout function in Kivy

def _create_popup(self, *_):
        app = App.get_running_app()
        if app.database_scanning:
            return
        content = BoxLayout(orientation='vertical')
        popup_width = min(0.95 * Window.width, dp(500))
        self.popup = popup = NormalPopup(title=self.title, content=content, size_hint=(None, 0.9), width=popup_width)
        if not self.value:
            content.add_widget(ShortLabel(height=app.button_scale * 3, text="You must set at least one database directory.\n\nThis is a folder where your photos are stored.\nNew photos will be imported to a database folder."))
            content.add_widget(BoxLayout())
        else:
            folders = filter(None, self.value.split(';'))
            folderdata = []
            for folder in folders:
                folderdata.append({'text': folder})
            self.folderlist = folderlist = FolderSettingsList(size_hint=(1, .8), id='folderlist')
            folderlist.data = folderdata
            content.add_widget(folderlist)
        buttons = BoxLayout(orientation='horizontal', size_hint=(1, None), height=app.button_scale)
        addbutton = NormalButton(text='+')
        addbutton.bind(on_release=self.add_path)
        removebutton = NormalButton(text='-')
        removebutton.bind(on_release=self.remove_path)
        okbutton = WideButton(text='OK')
        okbutton.bind(on_release=self._dismiss)
        buttons.add_widget(addbutton)

def _create_popup(self, *_):
        app = App.get_running_app()
        if app.database_scanning:
            return
        content = BoxLayout(orientation='vertical')
        popup_width = min(0.95 * Window.width, dp(500))
        self.popup = popup = NormalPopup(title=self.title, content=content, size_hint=(None, 0.9), width=popup_width)
        if not self.value:
            content.add_widget(ShortLabel(height=app.button_scale * 3, text="You must set at least one database directory.\n\nThis is a folder where your photos are stored.\nNew photos will be imported to a database folder."))
            content.add_widget(BoxLayout())
        else:
            folders = filter(None, self.value.split(';'))
            folderdata = []
            for folder in folders:
                folderdata.append({'text': folder})
            self.folderlist = folderlist = FolderSettingsList(size_hint=(1, .8), id='folderlist')
            folderlist.data = folderdata
            content.add_widget(folderlist)
        buttons = BoxLayout(orientation='horizontal', size_hint=(1, None), height=app.button_scale)
        addbutton = NormalButton(text='+')
        addbutton.bind(on_release=self.add_path)

def _create_popup(self, instance):
        # create popup layout
        content = BoxLayout(orientation='vertical', spacing=5)
        self.popup = popup = Popup(title=self.title,
            content=content, size_hint=(None, None), size=(400, 250))

        # create the textinput used for numeric input
        self.textinput = textinput = TextInput(text=str(self.value),
            font_size=24, multiline=False, size_hint_y=None, height=50)
        textinput.bind(on_text_validate=self._validate)
        self.textinput = textinput

        # construct the content, widget are used as a spacer
        content.add_widget(Widget())
        content.add_widget(textinput)
        content.add_widget(Widget())
        content.add_widget(SettingSpacer())

        # 2 buttons are created for accept or cancel the current value

def warn(self, title, text, action, cancel=1, tcolor=(1, .1, .1, 1)):
        """ Opens a dialog with a warning"""
        content = BoxLayout(orientation='vertical')
        label = Label(halign='center')
        label.text = text
        content.add_widget(label)

        buttons = BoxLayout(size_hint=(1, .4))

        if cancel:
            cancel_btn = Button(background_color=(.13, .13, .2, 1),
                                on_release=self.dismiss_popup)
            cancel_btn.text = 'Cancel'
            buttons.add_widget(cancel_btn)

        ok_btn = Button(background_color=(.13, .13, .2, 1),
                        on_release=action)
        ok_btn.text = 'OK'
        buttons.add_widget(ok_btn)

        content.add_widget(buttons)
        title_color = tcolor
        self.popup = AutoPopup(title_align='center', content=content,
                               title_size='18sp',

for path, name in fav_list:
            if isdir(path):
                self.add_node(TreeLabel(text=name, path=path), favs)

    def trigger_populate(self, node):
        if not node.path or node.nodes:
            return
        parent = node.path
        _next = next(walk(parent))
        if _next:
            for path in _next[1]:
                self.add_node(TreeLabel(text=path, path=parent + sep + path),
                              node)


class FileBrowser(BoxLayout):
    '''FileBrowser class, see module documentation for more information.
    '''

    __events__ = ('on_canceled', 'on_success', 'on_submit')

    select_state = OptionProperty('normal', options=('normal', 'down'))
    '''State of the 'select' button, must be one of 'normal' or 'down'.
    The state is 'down' only when the button is currently touched/clicked,
    otherwise 'normal'. This button functions as the typical Ok/Select/Save
    button.

    :data:`select_state` is an :class:`~kivy.properties.OptionProperty`.
    '''
    cancel_state = OptionProperty('normal', options=('normal', 'down'))
    '''State of the 'cancel' button, must be one of 'normal' or 'down'.
    The state is 'down' only when the button is currently touched/clicked,

pos: self.pos
                    size: self.size
                    source: f'{images_path}swipe_shadow.png'

            MDIconButton:
                id: delet_post_button
                size_hint: None, None
                size: dp(56), dp(56)
                icon: 'delete'
                disabled: True
                on_release: root.callback(root, None)
"""
)


class MDSeparator(ThemableBehavior, BoxLayout):
    """A separator line"""

    color = ListProperty()
    """Separator color."""

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.on_orientation()

    def on_orientation(self, *args):
        self.size_hint = (
            (1, None) if self.orientation == "horizontal" else (None, 1)
        )
        if self.orientation == "horizontal":
            self.height = dp(1)
        else:

def __init__(self, oMainWidget, **kwargs):
        super(ConsoleWidget, self).__init__(**kwargs)
        self.m_oMainWidget = oMainWidget
        
        self.orientation="vertical"
        
        self.inputlayout = BoxLayout(orientation='vertical', size_hint=(1, 0.1))
        self.make_consoleinput()
        self.add_widget(self.inputlayout)

        buttonslayout = BoxLayout(size_hint=(1, 0.1),orientation="horizontal")
        label1 = Label(text="History:", size_hint=(0.1, 1))
        buttonslayout.add_widget(label1)
        btn1 = Button(text='<', size_hint=(1.0 / 20.0, 1))
        btn1.bind(on_press = self.on_history_back)
        buttonslayout.add_widget(btn1)
        btn2 = Button(text='>', size_hint=(1.0 / 20.0, 1))
        btn2.bind(on_press = self.on_history_forward)
        buttonslayout.add_widget(btn2)
        buttonslayout.add_widget(Label(text="Screen:", size_hint=(0.1, 1)))
        btn3 = Button(text='Clear', size_hint=(0.1, 1))
        btn3.bind(on_press = self.on_clearbutton)
        buttonslayout.add_widget(btn3)

btn.bind(on_release=toggle_layout)

    def select_2nd_item(*l):
        acc.select(acc.children[-2])
    btn2 = Button(text='Select 2nd item')
    btn2.bind(on_release=select_2nd_item)

    from kivy.uix.slider import Slider
    slider = Slider()

    def update_min_space(instance, value):
        acc.min_space = value

    slider.bind(value=update_min_space)

    root = BoxLayout(spacing=20, padding=20)
    controls = BoxLayout(orientation='vertical', size_hint_x=.3)
    controls.add_widget(btn)
    controls.add_widget(btn2)
    controls.add_widget(slider)
    root.add_widget(controls)
    root.add_widget(acc)
    runTouchApp(root)