按Kivy按钮进入下一页

Question

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button

class LoginScreen(GridLayout):
def __init__(self, **kwargs):
super(LoginScreen, self).__init__(**kwargs)
self.cols = 2
self.submit = Button(text='Order', font_size=40)
self.add_widget(self.submit)
self.submit.bind(on_press=self.pressed)
def pressed(self, instance):
pressing = Secondtab()
pressing()

class Secondtab(GridLayout):
def __init__(self, **kwargs):
super(Secondtab, self).__init__(**kwargs)
self.cols = 5
self.submit = Button(text='Drinks', font_size=40)
self.add_widget(self.submit)
print('check')
def __call__(self):
print('new tab')


class MyApp(App):
def build(self):
return LoginScreen()

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

所以当我按下第一个按钮时，我希望窗口变成一个新的布局。我很难制作一个新的网格类，并称它会起作用，但它并没有像我预期的那样起作用。我不希望按钮打开新窗口，但我希望当前窗口刷新到新布局。

Answer 1

正如@John Anderson所建议的。看看屏幕管理器小部件。"当前窗口"必须是一个填充的屏幕小部件，您可以通过将下一个屏幕的名称分配给当前属性来更改当前屏幕。

Answer 2

我想这会对你有所帮助。使用ScreenManager:

from kivy.uix.screenmanager import ScreenManager, Screen, SlideTransition
class LoginScreen(GridLayout):
def __init__(self, **kwargs):
super(LoginScreen, self).__init__(**kwargs)
self.cols = 2
self.submit = Button(text='Order', font_size=40)
self.add_widget(self.submit)
self.submit.bind(on_press=self.pressed)
def pressed(self, instance):
pressing = Secondtab()
pressing()
myapp.screen_manager.transition = SlideTransition(direction='left', duration=.25)    #You can change transition speed or you could just remove it to set it on default
myapp.screen_manager.current = 'Secondtab'
class MyApp(App):
def build(self):
return LoginScreen()
self.screen_manager = ScreenManager()
self.loginscreen = LoginScreen()
screen = Screen(name='LoginScreen')
screen.add_widget(self.loginscreen)
self.screen_manager.add_widget(screen)
self.secondtab = Secondtab()
screen = Screen(name='Secondtab')
screen.add_widget(self.secondtab)
self.screen_manager.add_widget(screen)
return self.screen_manager