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python - 如何将 TextField 的值插入 KivyMD 中的列表项

问题描述

我正在尝试制作一个应用程序。单击屏幕右下角的按钮会出现一个对话窗口（弹出窗口）。在“完成”上单击弹出窗口关闭（close_dialog 方法），并出现一个新的列表项。List Item 的文本预计会通过以下代码从弹出窗口的 MDTextField 中获取：

    mylist = TwoLineAvatarListItem(text = DialogContent().textfield.text,
        secondary_text = "1,2,3...")

据我所知，我需要从 .kv 文件中的DialogContent另一个类Container中引用类，但我不知道如何正确执行。我该如何解决？

代码.py：

from kivy.lang import Builder
from kivy.core.window import Window
from kivymd.app import MDApp
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.scrollview import ScrollView
from kivymd.uix.button import MDFlatButton
from kivymd.uix.dialog import MDDialog
from kivymd.uix.textfield import MDTextField
from kivy.uix.textinput import TextInput
from kivy.uix.screenmanager import Screen, ScreenManager
from kivymd.uix.list import TwoLineAvatarListItem

Window.size = (288, 511)

class DialogContent(BoxLayout):
    pass

class Container(Screen):
    dialog = None

    def show_dialog(self, *args):
        '''
        Create group creation popup
        '''
        if not self.dialog:
            self.dialog = MDDialog(
                title="Create new group",
                type="custom",
                content_cls=DialogContent(),
                auto_dismiss=False
            )
        self.dialog.open()

    def close_dialog(self, *args):
        '''
        Close popup on Done click
        '''
        self.dialog.dismiss()
        self.new_window()

    def new_window(self, *args):
        '''
        Create new group button
        '''
        mylist = TwoLineAvatarListItem(text = DialogContent().textfield.text,
            secondary_text = "1,2,3...")
        self.mdlist.add_widget(mylist)


class grudget4App(MDApp):
    def build(self):
        container = Container()
        scroll = ScrollView()
        return container

if __name__ == '__main__':
    grudget4App().run()

代码.kv：

<DialogContent>:
    textfield: textfield
    orientation: "vertical"
    spacing: "12dp"
    size_hint_y: None
    height: "120dp"

    MDTextField:
        id: textfield
        hint_text: "Group name"

    MDFlatButton:
        id: btn1
        text: "Done"
        text_color: self.theme_cls.primary_color
        on_release: app.root.close_dialog()

<Container>:
    mdlist: mdlist
    FloatLayout:
        size_hint: 1, 0.89
        ScrollView:
            MDList:
                id: mdlist
    MDFloatingActionButton:
        pos_hint: {'right': 0.95, 'y': 0.05}
        icon: "icon.png"
        theme_text_color: "Custom"
        text_color: app.theme_cls.primary_color
        on_release:
            root.show_dialog()

    Screen:
        NavigationLayout:
            ScreenManager:
                Screen:
                    BoxLayout:
                        orientation: 'vertical'
                        MDToolbar:
                            title: ''
                            size_hint: 1, 0.14
                            left_action_items: [["menu", lambda x: nav_drawer.toggle_nav_drawer()]]
                            elevation:10
                        Widget:
            MDNavigationDrawer:
                id: nav_drawer

标签： pythonkivykivymd

解决方案

编码：

    mylist = TwoLineAvatarListItem(text = DialogContent().textfield.text,
        secondary_text = "1,2,3...")

正在创建 的新实例，与显示中的DialogContent无关。DialogContent要访问正确的实例，请使用：

    mylist = TwoLineAvatarListItem(text = self.dialog.content_cls.textfield.text,
        secondary_text = "1,2,3...")

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