如何从另一个类设置类变量(Kivy/KivyMD)
如何从另一个类设置类变量(Kivy/KivyMD)
提问于 2022-09-23 03:53:16
因此，我在尝试设置另一堂课的按钮文本时遇到了困难。
如果您查看函数set_people，我使用PosScreen.people = name来更改名称，但是按钮文本不会更改。因此，我想我必须通过ids获得它，但我坚持如何从另一个类完成它。这是我的代码：
test.py
from kivy.properties import StringProperty
from kivy.uix.boxlayout import BoxLayout
from kivymd.app import MDApp
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.uix.button import MDFlatButton
from kivymd.uix.dialog import MDDialog
pos_dialog = None
class PosScreen(Screen):
people = StringProperty("")
def __init__(self, **kwargs):
super(PosScreen, self).__init__(**kwargs)
def on_pre_enter(self, *args):
self.people = "No one"
def close_dialog(self, *obj):
global pos_dialog
pos_dialog.dismiss()
pos_dialog = None
def open_people_dialog(self):
global pos_dialog
if not pos_dialog:
pos_dialog = MDDialog(
title="Choose customer",
type="custom",
content_cls=DialogContentPosAddPeople(),
buttons=[
MDFlatButton(
text="Close",
theme_text_color="Custom",
on_release=self.close_dialog
)
]
)
pos_dialog.open()
class DialogContentPosAddPeople(BoxLayout):
def __init__(self, **kwargs):
super(DialogContentPosAddPeople, self).__init__(**kwargs)
self.set_list_people()
def set_list_people(self, text="", search=False):
peeps = ["Brian", "AJ", "Nick", "Kevin", "Howie"]
def add_name_item(name):
self.ids.rv.data.append(
{
"viewclass": "OneLineListItem",
"text": name,
"on_release": lambda x=name: self.set_people(x),
}
)
self.ids.rv.data = []
for name in peeps:
if search:
if text.lower() in name.lower():
add_name_item(name)
else:
add_name_item(name)
def set_people(self, name):
global pos_dialog
PosScreen.people = name # it changes the variable but button text doesn't change
PosScreen.ids.people_button.text = name # Not accessible NoneType
pos_dialog.dismiss()
pos_dialog = None
return
class testApp(MDApp):
def build(self):
self.theme_cls.primary_palette = "Teal"
sm = ScreenManager()
sm.add_widget(PosScreen(name="pos"))
return sm
if __name__ == "__main__":
testApp().run()test.kv
PosScreen:
<PosScreen>:
name: "pos"
people_button: people_button
canvas.before:
Color:
rgba: 72/255, 72/255, 72/255, 1
Rectangle:
pos: self.pos
size: self.size
MDBoxLayout:
orientation: "vertical"
RelativeLayout:
orientation: "vertical"
MDRectangleFlatIconButton:
id: people_button
icon: "account-circle-outline"
text: root.people
pos_hint:{'x': 0.05, 'center_y': 0.9}
md_bg_color: 0, 0, 0, 1
on_release: root.open_people_dialog()
<DialogContentPosAddPeople>:
rv: rv
orientation: "vertical"
spacing: dp(10)
padding: dp(20)
size_hint_y: None
height: "240dp"
MDBoxLayout:
adaptive_height: True
MDIconButton:
icon: 'magnify'
MDTextField:
id: search_field
hint_text: 'Search name'
on_text: root.set_list_people(self.text, True)
RecycleView:
id: rv
key_viewclass: 'viewclass'
key_size: 'height'
RecycleBoxLayout:
padding: dp(10)
default_size: None, dp(48)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'预期结果:当我单击其中一个名称时，它将关闭对话框并将按钮的文本更改为我选择的名称
有人能帮我解释一下我如何做到这一点吗？
回答 1
Stack Overflow用户
发布于 2022-09-23 16:44:26
因此，在调用第二个类时，我通过传递屏幕对象来解决这个问题。
class PosScreen(Screen):
...
def open_people_dialog(self):
global pos_dialog
if not pos_dialog:
pos_dialog = MDDialog(
...
content_cls=DialogContentPosAddPeople(self), # Added self here
...
)
]
)
pos_dialog.open()在被叫的班级中：
class DialogContentPosAddPeople(BoxLayout):
def __init__(self, master, **kwargs): # Added master
super(DialogContentPosAddPeople, self).__init__(**kwargs)
self.master = master
def set_people(self, name):
self.master.people = name #Referencing the master
self.master.ids.people_button.text = name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/73822815
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