如何从分配给 KivyMD Python 中的 MDLists 的 TextFields 获取数据

Posted 2023-04-14

【中文标题】如何从分配给 KivyMD Python 中的 MDLists 的 TextFields 获取数据

【英文标题】：How to get data from TextFields assigned to MDLists in KivyMD Python

【发布时间】：2021-10-17 19:50:42

【问题描述】：

---

我想从分配给 MDList 的文本字段中获取用户输入并分配给一个列表（变量）。能不能按照我按照的方法来做。

否则

能否在可滚动窗口中添加文本字段？如果是这样，那就容易多了 还有其他方法吗？

代码.kv

screen_helper = """
    
    ScreenManager:
        NoS:
        Neutral:
        
    <NoS>:
        name: 'nos'
        MDLabel:
            text: 'Get Songs to your Studio'
            font_style: 'H3'
            halign: 'center'
            pos_hint: 'center_x':0.5,'center_y':0.75
        MDTextField:
            id:nos
            pos_hint: 'center_x':0.5,'center_y':0.45
            size_hint: (0.7,0.1)
            hint_text : 'Number of Songs you want to Get'
            helper_text: 'Required'
            helper_text_mode: 'on_focus'
            icon_right: 'account-music'
            mode : 'rectangle'
            icon_right_color: app.theme_cls.primary_light
            required : True
        MDRaisedButton:
            text: 'Back'
            pos_hint: 'center_x':0.1,'center_y':0.08
            font_style: 'Button'
            ripple_rad_default : 40
            ripple_duration_out : 1
            md_bg_color: app.theme_cls.accent_dark
            on_press: 
                root.manager.current = 'settingup'
                root.manager.transition.direction = 'right'
        MDRaisedButton:
            text:"Next"
            pos_hint: 'center_x':0.9,'center_y':0.08
            font_style: 'Button'
            ripple_rad_default : 40
            ripple_duration_out : 1
            md_bg_color: app.theme_cls.primary_dark
            on_press:
                root.manager.current = 'neutral'
                root.manager.transition.direction = 'left'     
                app.song_info()   
        MDProgressBar:
            value:60
            pos_hint:'center_y' : 0.007
            
    <Neutral>:
        name : 'neutral'
        MDBoxLayout:
            orientation: "vertical"
            MDToolbar:
                md_bg_color: 0,0,0,.000001
                specific_text_color: app.theme_cls.primary_light
                title: "Get Songs to your Neutral Album"
                left_action_items: [["arrow-left", lambda x: app.back_to_nos()]]   
            ScrollView:
                MDList:
                    id: neutral
                    padding : '80dp'
        MDBoxLayout:
            orientation: "vertical"
            adaptive_height: True
            height: '69dp'
            md_bg_color: .07,.07,.07,1
        MDRaisedButton:
            text : 'Next'
            pos_hint : 'center_x':0.9,'center_y':0.08
            font_style: 'Button'
            ripple_rad_default : 40
            ripple_duration_out : 1
            md_bg_color: app.theme_cls.primary_dark
            on_press:
                root.manager.current = 'home'
                root.manager.transition.direction = 'left'
        MDRaisedButton:
            text: 'Back'
            id : reset_nos
            pos_hint: 'center_x':0.1,'center_y':0.08
            font_style: 'Button'
            ripple_rad_default : 40
            ripple_duration_out : 1
            md_bg_color: app.theme_cls.accent_dark
            on_press: 
                root.manager.current = 'nos'
                root.manager.transition.direction = 'right'     
                
    """

---

TextFields 已使用self.screen.get_screen('neutral').ids.neutral.add_widget(MDTextField()) 分配给ScrollView 中的MDList

代码.py

​​>

from kivy.lang.builder import Builder
from kivy.uix.screenmanager import Screen, ScreenManager
from kivymd.app import MDApp
from kivy.core.window import Window
from kivymd.uix.textfield import MDTextField

Window.size = (900, 600)


class NoS(Screen):
    pass


class Neutral(Screen):
    pass

sm = ScreenManager()
sm.add_widget(NoS(name='nos'))
sm.add_widget(Neutral(name='neutral'))

class Mode(MDApp):
    def build(self):
        screen = Screen()
        self.screen = Builder.load_string(screen_helper)
        screen.add_widget(self.screen)

        self.theme_cls.primary_palette = "Blue"
        self.theme_cls.accent_palette = 'Red'  # 'Red' ,'Yellow'
        self.theme_cls.primary_hue = "A700"
        self.theme_cls.theme_style = "Dark"

        return screen

    def song_info(self):
        nos = int(self.screen.get_screen('nos').ids.nos.text) + 1

        for i in range(1, nos):
            if i == 1:
                self.screen.get_screen('neutral').ids.neutral.add_widget(
                    MDTextField(
                        hint_text=f"Enter the " + str(i) + "st Song you want to Enjoy when you are in Neutral",
                        pos_hint='center_x': 0.5, 'center_y': 0.45,
                        size_hint=(0.7, 0.1), icon_right='account-music',
                        mode='rectangle', icon_right_color=self.theme_cls.primary_light
                    )
                )
            elif i == 2:
                self.screen.get_screen('neutral').ids.neutral.add_widget(
                    MDTextField(hint_text=f"Enter the " + str(i) + "nd Song you want to Enjoy when you are in Neutral",
                                pos_hint='center_x': 0.5, 'center_y': 0.45,
                                size_hint=(0.7, 0.1), icon_right='account-music',
                                mode='rectangle', icon_right_color=self.theme_cls.primary_light
                                )
                )
            elif i == 3:
                self.screen.get_screen('neutral').ids.neutral.add_widget(
                    MDTextField(hint_text=f"Enter the " + str(i) + "rd Song you want to Enjoy when you are in Neutral",
                                pos_hint='center_x': 0.5, 'center_y': 0.45,
                                size_hint=(0.7, 0.1), icon_right='account-music',
                                mode='rectangle', icon_right_color=self.theme_cls.primary_light)
                )
            else:
                self.screen.get_screen('neutral').ids.neutral.add_widget(
                    MDTextField(hint_text=f"Enter the " + str(i) + "th Song you want to Enjoy when you are in Neutral",
                                pos_hint='center_x': 0.5, 'center_y': 0.45,
                                size_hint=(0.7, 0.1), icon_right='account-music',
                                mode='rectangle', icon_right_color=self.theme_cls.primary_light)
                )
                
                
Mode().run()

【参考方案1】：

您可以将此方法添加到您的Mode 类中：

def get_songs(self):
    neutral = self.screen.get_screen('neutral').ids.neutral
    song_list = []
    for w in neutral.walk():
        if isinstance(w, MDTextField):
            song_list.append(w.text)
    print('songs:', song_list)
    return song_list

然后只需调用该方法即可获取歌曲列表。

【讨论】：

我找不到完美的方法。这种方法能够成功地做到这一点。非常感谢@John Anderson