如何使用Kivy将元素列表从屏幕传输到另一个屏幕
如何使用Kivy将元素列表从屏幕传输到另一个屏幕
提问于 2016-12-27 00:37:27
在将元素列表从文件(在第一个屏幕中)转移到第二个和第三个屏幕时，我遇到了一些困难。
我有3个由ScreenManager管理的屏幕，每个屏幕都在一个不同的file.py中，并且有一个file.kv。这就是我的ScreenManager的样子(文件名: login.py)：
from interface1 import Interface1App
from interface2 import Interface2App
class LoginApp(App):
def build(self):
manager = ScreenManager()
#add view login
manager.add_widget(Login(name='login'))
# add view 'interface1'
app = Interface1App()
app.load_kv()
interfacen1 = app.build()
manager.add_widget(interfacen1)
# add view 'interface2'
app2 = Interface2App()
app2.load_kv()
interfacen2 = app2.build()
manager.add_widget(interfacen2)
# add view 'interface3'
app3 = Interface3App()
app3.load_kv()
interfacen3 = app3.build()
manager.add_widget(interfacen3)
manager.transition = SlideTransition(direction="left")
return manager在屏幕管理器登录中，我导入了所有屏幕(例如:从interface1导入Interface1App)
在第二个文件中，我输入了一些数据，并将其用于接口(filename : interface1.py)：
from interface2 import Interface2App
class AllImage(Screen):
CONTAINER_PNG = os.path.join(AllImage_ROOT, 'images')
IMAGES_NAMES = [c[:-4] for c in os.listdir(CONTAINER_PNG)]
def __init__(self, **kwargs):
Screen.__init__(self, **kwargs)
for im in IMAGES_NAMES:
if IMAGES_NAMES != None :
toggleimage = ToggleWithImage(src=im+'.png')
toggleimage.bind(on_press= lambda a, im=im:self.onpress_addpage(self.listim, im))
self.layout.add_widget(toggleimage)
def change_screen(self, x, list):
self.manager.transition = SlideTransition(direction="left")
self.manager.current = 'interface2'
self.manager.get_screen('interface2')
self.manager.list1 = [1,2,3]
def backtologin(self):
self.manager.transition = SlideTransition(direction="right")
self.manager.current = 'login'
self.manager.get_screen('login')
class Interface1App(App):
'''The kivy App that runs the main root. All we do is build a AllImage
widget into the root.'''
def build(self):
screen = AllImage()
screen.name = 'interface1'
return screen之后，我想再次使用第二个接口(self.list)中收集的数据，并在第三个接口中使用它(文件名: interace2.py)：
from interface1 import AllImage #this isn't working
class Combinaison(Screen):
screen = ObjectProperty(None)
def __init__(self, **kwargs):
# self._previously_parsed_text = ''
super(Combinaison, self).__init__(**kwargs)
# self.list = list(self.manager.get_screen('interface1').list)
print(self.manager.list1) # The problem is here <===========
def backtointerface1(self):
self.manager.transition = SlideTransition(direction="right")
self.manager.current = 'interface1'
self.manager.get_screen('interface1')
class Interface2App(App):
'''The kivy App that runs the main root. All we do is build a Combinaison
widget into the root.'''
def build(self):
screen = Combinaison()
screen.name = 'interface2'
return screen对于这段代码，我有一个错误：print(self.manager.list1) AttributeError: 'NoneType' object has no attribute 'list1'
我想我不知道该如何使用self.manager.list1=1，2，3
我希望我说的很清楚，很抱歉我的职位太长了。谢谢你抽出时间:)
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-12-27 02:29:27
您可以使用Screen.manager.get_screen(name).list = list(self.list)
一个完整的例子：
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.button import Button
class Screen1(Screen):
list = [1,2,3]
def __init__(self,**kwargs):
super(Screen1,self).__init__(**kwargs)
self.switch_button = Button(text="goto 2")
self.switch_button.bind(on_release=self.switch)
self.add_widget(self.switch_button)
def switch(self,*args):
self.list = [4,5,6]
self.manager.get_screen("screen2").list = list(self.list)
self.manager.current = "screen2"
class Screen2(Screen):
def __init__(self,**kwargs):
super(Screen2,self).__init__(**kwargs)
self.switch_button = Button(text="goto 1")
self.switch_button.bind(on_release=self.switch)
self.add_widget(self.switch_button)
def switch(self,*args):
self.manager.current = "screen1"
def on_enter(self):
print self.list
class MainApp(App):
def build(self):
sc1 = Screen1(name="screen1")
sc2 = Screen2(name="screen2")
self.sm = ScreenManager()
self.sm.add_widget(sc1)
self.sm.add_widget(sc2)
return self.sm
MainApp().run()还可以使用ScreenManager存储列表。
self.manager.list1 = [1,2,3] # dont call this in __init__
self.manager.list2 = [4,5,6] # call it in on_enter instead这些列表将在添加到管理器后从所有屏幕上获得。屏幕上的on_enter方法将适合您的示例。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/41337656
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