Kivy更新微件

我叫data.txt中包含的用户名和密码的文本文件阅读。文本文件的格式为：Kivy更新微件

USERNAME1
密码1
USERNAME2
密码2
USERNAME3
USERNAME3
等

我的用户名读取和做出相应按钮，每个用户名。当我第一次启动程序时，它会显示data.txt中的所有内容并且可以正常工作。但是，当我添加使用该程序的用户时，它不会更新主屏幕上的用户列表。我将如何更新列表？

import kivy 
from kivy.app import App 
from kivy.uix.screenmanager import Screen, ScreenManager, NoTransition 
from kivy.uix.boxlayout import BoxLayout 
from kivy.uix.floatlayout import FloatLayout 
from kivy.uix.label import Label 
from kivy.uix.button import Button 
from kivy.core.window import Window 
from kivy.config import Config 
from kivy.properties import ObjectProperty 
from kivy.uix.textinput import TextInput 
from kivy.uix.popup import Popup 
from numpy import loadtxt 
from kivy.uix.widget import Widget 
from os.path import sep, expanduser, isdir, dirname 
from kivy.uix.stacklayout import StackLayout 
from functools import partial 
from kivy.uix.scrollview import ScrollView 
from kivy.uix.gridlayout import GridLayout 

class AddUserWindow(Screen): 
    def __init__(self,**kwargs): 
     super (AddUserWindow,self).__init__(**kwargs) 
     addNewUserLayout = FloatLayout() 
     newUserLabel = Label(text="User Name:", font_size='15dp', size_hint = (.5, .05), pos = (500, 450), halign = 'right') 
     passwordLabel = Label(text="Password:", font_size='15dp', size_hint = (.5, .05), pos = (500, 400), halign = 'right') 
     confirmPasswordLabel = Label(text="Confirm Password:", font_size='15dp', size_hint = (.5, .05), pos = (500, 350), halign = 'right') 
     self.newUserInput = TextInput(text = "", size_hint = (.25, .05), pos = (875, 450), font_size='15dp', multiline = False, write_tab = False) 
     self.passwordInput = TextInput(text = "", password = True, size_hint = (.25, .05), pos = (875, 400), font_size='15dp', multiline = False, write_tab = False) 
     self.confirmPasswordInput = TextInput(text = "", password = True, size_hint = (.25, .05), pos = (875, 350), font_size='15dp', multiline = False, write_tab = False) 
     cancelButton = Button(text="Cancel",size_hint = (.2, .05), pos = (650,0)) 
     cancelButton.bind(on_press = self.changeToMainWindow) 
     okButton = Button(text="Ok",size_hint = (.2, .05), pos = (350,0)) 
     okButton.bind(on_press=self.newUserCheck) 
     addNewUserLayout.add_widget(cancelButton) 
     addNewUserLayout.add_widget(okButton) 
     addNewUserLayout.add_widget(newUserLabel) 
     addNewUserLayout.add_widget(passwordLabel) 
     addNewUserLayout.add_widget(confirmPasswordLabel) 
     addNewUserLayout.add_widget(self.newUserInput) 
     addNewUserLayout.add_widget(self.passwordInput) 
     addNewUserLayout.add_widget(self.confirmPasswordInput) 

     self.add_widget(addNewUserLayout) 

    def newUserCheck(self, *args): 

     if self.newUserInput.text == "": 
      content = Button(text = 'Close') 
      popup = Popup(title = 'Please enter user name', size_hint = (.4, .15), content = content, auto_dismiss = False) 
      content.bind(on_press = popup.dismiss) 
      popup.open() 
      return 

     if self.passwordInput.text == "": 
      content = Button(text = 'Close') 
      popup = Popup(title = 'Please enter password', size_hint = (.4, .15), content = content, auto_dismiss = False) 
      content.bind(on_press = popup.dismiss) 
      popup.open() 
      return 

     if self.confirmPasswordInput.text == "": 
      content = Button(text = 'Close') 
      popup = Popup(title = 'Please confirm password', size_hint = (.4, .15), content = content, auto_dismiss = False) 
      content.bind(on_press = popup.dismiss) 
      popup.open() 
      return 

     if self.passwordInput.text != self.confirmPasswordInput.text: 
      content = Button(text = 'Close') 
      popup = Popup(title = 'Passwords must match', size_hint = (.4, .15), content = content, auto_dismiss = False) 
      content.bind(on_press = popup.dismiss) 
      popup.open() 
      return 


     file = open('data.txt', 'r') 
     initial = file.readlines() 
     databaselines = sum(1 for line in open('data.txt')) 
     file.close() 


     users = databaselines/2 
     data = [[0 for x in range(2)] for y in range(users)] 
     currLine = 0 
     range(users) 
     for i in range(users): 
      data[i][0] = initial[currLine].rstrip() 
      data[i][1] = initial[currLine + 1].rstrip() 
      currLine += 2 

     inDatabase = 0 
     for i in range(users): 
      if data[i][0] == self.newUserInput.text: 
       inDatabase = 1 
       break 
     if inDatabase == 1: 
      content = Button(text = 'Close') 
      popup = Popup(title = 'Already in database', size_hint = (.4, .15), content = content, auto_dismiss = False) 
      content.bind(on_press = popup.dismiss) 
      popup.open() 
      return 

     with open("data.txt", "a") as dataFile: 
      dataFile.write(self.newUserInput.text + "\n") 
      dataFile.write(self.passwordInput.text + "\n") 
     self.changeToMainWindow 


    def changeToMainWindow(self, *args): 
     self.newUserInput.text = "" 
     self.passwordInput.text = "" 
     self.confirmPasswordInput.text = "" 
     self.manager.current = 'mainScreen' 

class MainWindow(Screen): 

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

     self.mainLayout = FloatLayout() 

     logoutButton = Button(text="Logout",size_hint = (.2, .1), pos = (650,0)) 
     logoutButton.bind(on_press = exit) 
     addNewUserButton = Button(text="New User",size_hint = (.2, .1), pos = (350,0)) 
     addNewUserButton.bind(on_press=self.changeToAddUser) 
     self.mainLayout.add_widget(logoutButton) 
     self.mainLayout.add_widget(addNewUserButton) 
     file = open('data.txt', 'r') 
     initial = file.readlines() 
     databaselines = sum(1 for line in open('data.txt')) 
     file.close() 


     users = databaselines/2 
     data = [[0 for x in range(2)] for y in range(users)] 
     currLine = 0 
     range(users) 
     for i in range(users): 
      data[i][0] = initial[currLine].rstrip() 
      data[i][1] = initial[currLine + 1].rstrip() 
      currLine += 2 

     self.layout = GridLayout(cols=1, spacing=10, size_hint_y=None) 
     self.layout.bind(minimum_height=self.layout.setter('height')) 
     for i in range(users): 
      self.btn = Button(text=data[i][0], size_hint_y=None, height=40) 
      self.layout.add_widget(self.btn) 
     self.root = ScrollView(size_hint=(.45, None), pos = (600, 100), size=(Window.width, Window.height)) 
     self.root.add_widget(self.layout) 

     self.mainLayout.add_widget(self.root) 
     self.add_widget(self.mainLayout) 




    def changeToAddUser(self, *args): 
     self.manager.current = 'addUserScreen' 



class TestApp(App): 
     def build(self): 
      self.my_screenmanager = ScreenManager(transition = NoTransition()) 
      self.mainScreen = MainWindow(name='mainScreen') 
      self.addUserScreen = AddUserWindow(name = 'addUserScreen') 
      self.my_screenmanager.add_widget(self.mainScreen) 
      self.my_screenmanager.add_widget(self.addUserScreen) 

      Window.size = (1200, 800) 
      return self.my_screenmanager 

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

非常感谢！

来源

2016-09-17 bafflingbill23

要么你可以定义一个函数添加适当的小部件的布局或者您也可以“干净”的布局，再从数据库中读取每一个用户。如果你有很多用户，这可能需要一段时间。

要通过一个函数添加用户：

class MainWindow(Screen): 

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

     [... create initial widgets ...] 

     [... read users from database ...] 

     for i in range(users): 
      self.add_user(data[i][0] 

     self.root = ScrollView(size_hint=(.45, None), pos = (600, 100), size=(Window.width, Window.height)) 
     self.root.add_widget(self.layout) 

     self.mainLayout.add_widget(self.root) 
     self.add_widget(self.mainLayout) 

    def add_user(self, text): 
     button = Button(text=text, size_hint_y=None, height=40) 
     self.layout.add_widget(button)

然后添加一个新用户时：

def newUserCheck(self, *args): 

    [... do checks ...] 
    [... write to file ...] 

    # replace `text` with whatever text you want to display 
    self.manager.get_screen("mainScreen").add_user(text) 

    # in your shown code you missed the() on this function call 
    self.changeToMainWindow()

此外，我个人认为你的代码比较难读。您可以创建一些功能并给他们打电话。 create_initial_widgets，read_users_from_database，write_user_to_database等

来源

2016-09-17 09:09:05 syntonym

感谢您的回答。我试过这样做，但后来我遇到了从另一个类调用函数的问题。我对基维是新手，所以我仍然试图弄清楚。 – bafflingbill23

什么都不起作用？我只是看到我在'add_user'的定义中错过了'self'，可能是这样吗？通常从自己的类（通过'self'）或从其他类（通过保存在该类的对象上的变量）调用函数之间没有真正的区别。 – syntonym

我相信你的作品，但我真的不知道我会怎么称呼add_user。 add_user在MainWindow类中，我试图从AddUserWindow类中调用add_user。对不起，我有点慢，我仍然试图拿起基维和Python – bafflingbill23

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