我正在尝试浏览我的应用程序,我可以通过导航抽屉更改屏幕,但是当我在远离导航抽屉的其中一个屏幕内时,我不知道如何更改到另一个屏幕.
下面的应用程序允许用户点击导航抽屉中的“转到元素 1”按钮,这将把他们带到“元素 1 屏幕”,这个屏幕远离导航抽屉,它有一个可点击的 MDCard。
当用户点击该 MDCard 时,它应该将他们带到“元素 2 屏幕”,但这就是我被卡住的地方。我不知道如何让 kivy 在这里更改屏幕。如何获取元素 1 中的 MdCard 以将屏幕切换到元素 2?
该应用程序被排列成 3 个 .py 文件:
下面的代码流程是这样的:
Main App --> Element 1 button --> Element 1 screen --> Element 2 screen
PS:下面的代码仅用于训练目的,它代表了我实际应用的总体布局。
主应用代码:
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivymd.app import MDApp
from element_1 import element_1_screen
from element_2 import element_2_screen
MainNavigation = '''
<ContentNavigationDrawer>:
ScrollView:
MDList:
OneLineListItem:
text: 'Go to Element 1'
on_press:
root.nav_drawer.set_state("close")
root.screen_manager.current = "go_to_element_1_screen"
Screen:
MDToolbar:
id: toolbar
pos_hint: {"top": 1}
elevation: 10
left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]
MDNavigationLayout:
x: toolbar.height
ScreenManager:
id: screen_manager
Screen:
name: "words_nav_item"
element_1_screen:
name: "go_to_element_1_screen"
element_2_screen:
name: "go_to_element_2_screen"
MDNavigationDrawer:
id: nav_drawer
ContentNavigationDrawer:
screen_manager: screen_manager
nav_drawer: nav_drawer
'''
class ContentNavigationDrawer(BoxLayout):
screen_manager = ObjectProperty()
nav_drawer = ObjectProperty()
class mainApp(MDApp):
def build(self):
self.theme_cls.primary_palette = "Red"
return Builder.load_string(MainNavigation)
mainApp().run()
元素 1 屏幕:
from kivy.lang import Builder
from kivymd.uix.screen import Screen
element_1_contents = '''
MDScreen:
MDCard:
orientation: 'vertical'
size_hint: None, None
size: "360dp", "360dp"
pos_hint: {"center_x": .5, "center_y": .5}
ripple_behavior: True
focus_behavior: True
on_press: root.screen_manager.current = "go_to_element_2_screen"
MDLabel:
text: "Welcome to Element 1"
halign: 'center'
MDLabel:
text: "Click here to go to element 2"
halign: 'center'
'''
class element_1_screen(Screen):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.directory = Builder.load_string(element_1_contents)
self.add_widget(self.directory)
元素 2 屏幕:
# Element 2 has the same code as element 1 except that for these two lines
MDLabel:
text: "Welcome to Element 2"
MDLabel:
text: "Click here to go to element 3"
答案 0 :(得分:0)
让它工作的一个技巧是改变:
root.screen_manager.current =
到:
root.parent.manager.current =
在 element_1.py
和 element_2.py
文件中。