从 Kivy 的另一个屏幕更改小部件
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【中文标题】从 Kivy 的另一个屏幕更改小部件【英文标题】:Changing widget from another screen in Kivy 【发布时间】:2020-08-12 23:49:48 【问题描述】:我正在尝试通过 Kivy 另一个视图中的按钮更新一个小部件。
基维码:
<MainScreen>:
relatorios : relatorios
despesas : despesas
GridLayout:
size: root.width, root.height
cols : 1
Button:
id: relatorios
text: 'Relatorios'
on_press: root.change_screen(rep = 'Report')
Button:
id: despesas
text: 'Despesa'
on_press: root.change_screen(rep = 'Expend')
<ReportScreen>:
GridLayout:
size: root.width, root.height
cols : 1
Button:
id: semanal
text: 'Semanal'
Button:
id: mensal
text: 'Mensal'
Button:
id: anual
text: 'Anual'
Button:
id: voltar
text: 'Voltar'
on_press: root.change_screen(rep = 'Main')
<ExpendScreen>:
kind_selec1 : kind_select
GridLayout:
size: root.width, root.height
cols : 2
Label:
id: kind
text: 'Tipo de Despesa'
Button:
id: kind_select
text: 'Selecionar'
on_press: root.change_screen(rep = 'Kind')
Label:
id: way
text: 'Meio de Pagamento'
Button:
id: selec_way
text: 'Selecionar'
on_press: root.change_screen(rep = 'Way')
Label:
id: parcelas
text: 'Quantidade de Parcelas'
TextInput:
id: qtdy
Label:
id: value
text: 'Valor Total'
TextInput:
id: qtdy
Button:
id: back
text: 'Voltar'
on_press: root.change_screen(rep = 'Main')
Button:
id: submit
text: 'Registrar'
on_press: root.change_name()
<DropDown1>:
cols : 1
orientation: 'vertical'
<DropDown2>:
cols : 1
orientation: 'vertical'
Python 代码:
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.widget import Widget
from functools import partial
from functions import Expense
from kivy.properties import ObjectProperty
import kivy
import time
class MainScreen(Widget):
relatorios = ObjectProperty(None)
despesas = ObjectProperty(None)
def change_screen(self,rep):
app_finan_con.screen_manager.current = rep
return
class ReportScreen(Widget):
def change_screen(self,rep):
app_finan_con.screen_manager.current = rep
return
class ExpendScreen(Widget):
kind_selec1 = ObjectProperty()
def __init__(self, **kwargs):
super(ExpendScreen, self).__init__(**kwargs)
def change_screen(self,rep):
app_finan_con.screen_manager.current = rep
def change_name(self):
self.kind_selec1.text= 'porra'
class Dropdown1(BoxLayout):
def __init__(self, **kwargs):
super(Dropdown1, self).__init__(**kwargs)
list = ['Alimentação', 'Transporte', 'Entretenimento','Moradia','Doação']
for item in list:
self.but = Button(text=item)
self.add_widget(self.but)
self.but.bind(on_release=partial(self.It,arg = item))
def It(self,instance,arg):
app_finan_con.screen_manager.current = 'Expend'
ExpendScreen.change_name(ExpendScreen)
class Dropdown2(BoxLayout):
def __init__(self, **kwargs):
super(Dropdown2, self).__init__(**kwargs)
list = ['Crédito', 'Débito', 'Dinheiro']
for item in list:
self.but = Button(text=item)
self.add_widget(self.but)
self.but.bind(on_release=partial(self.It, arg=item))
def It(self,instance,arg):
app_finan_con.screen_manager.current = 'Expend'
class MyApp(App):
def build(self):
self.screen_manager = ScreenManager()
self.mainscreen = MainScreen()
screen = Screen(name='Main')
screen.add_widget(self.mainscreen)
self.screen_manager.add_widget(screen)
self.reportscreen = ReportScreen()
screen = Screen(name='Report')
screen.add_widget(self.reportscreen)
self.screen_manager.add_widget(screen)
self.expendscreen = ExpendScreen()
screen = Screen(name='Expend')
screen.add_widget(self.expendscreen)
self.screen_manager.add_widget(screen)
self.dropdown1 = Dropdown1()
screen = Screen(name='Kind')
screen.add_widget(self.dropdown1)
self.screen_manager.add_widget(screen)
self.dropdown2 = Dropdown2()
screen = Screen(name='Way')
screen.add_widget(self.dropdown2)
self.screen_manager.add_widget(screen)
return self.screen_manager
def change_screen():
app_finan_con.screen_manager.current ='Report'
return
if __name__ == '__main__':
app_finan_con = MyApp()
app_finan_con.run()
思路是使用screen Dropdown1通过这段代码修改screen ExpendScreen:
class Dropdown1(BoxLayout):
def __init__(self, **kwargs):
super(Dropdown1, self).__init__(**kwargs)
list = ['Alimentação', 'Transporte', 'Entretenimento','Moradia','Doação']
for item in list:
self.but = Button(text=item)
self.add_widget(self.but)
self.but.bind(on_release=partial(self.It,arg = item)) (this line activates It method)
def It(self,instance,arg):
app_finan_con.screen_manager.current = 'Expend'
ExpendScreen.change_name(ExpendScreen) (this line activates method in ExpendScreen):
class ExpendScreen(Widget):
kind_selec1 = ObjectProperty()
def __init__(self, **kwargs):
super(ExpendScreen, self).__init__(**kwargs)
def change_screen(self,rep):
app_finan_con.screen_manager.current = rep
def change_name(self):
self.kind_selec1.text= 'porra'
但我收到以下错误:AttributeError: 'kivy.properties.ObjectProperty' object has no attribute 'text'
但是当我从同一屏幕 (ExpendScreen) 中的按钮调用相同的方法时,它按预期工作,kivy 代码:
Button:
id: submit
text: 'Registrar'
on_press: root.change_name()
图片示例:
谁能帮帮我?
【问题讨论】:
【参考方案1】:你的代码行:
ExpendScreen.change_name(ExpendScreen)
在没有实例的情况下调用ExpendScreen
的实例方法。那是行不通的。您需要获取属于您的 gui 的 ExpendScreen
的实例,并调用其 change_name
方法。我没有对此进行测试,但我认为将上面的行替换为:
app_finan_con.expendscreen.change_name()
会做你想做的。
【讨论】:
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