Python KivyMD:如何使toggle_nav_drawer()函数起作用? [英] Python KivyMD: How can I make the toggle_nav_drawer() function work?
问题描述
我的kv代码在这里有问题.我想用几个NavigationDrawerIconButtons创建一个MDNavigationDrawer.窗口出现，但是当我单击MDToolbar时，程序崩溃并显示此错误消息.
I got a problem with my kv code here. I want to create a MDNavigationDrawer with a few NavigationDrawerIconButtons. The window shows up but when I click at the MDToolbar the program crashes and shows this Error Message.
Traceback (most recent call last):
File "C:/Users/path/to/my/file/main.py", line 189, in <module>
KivyGUI().run()
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\app.py", line 855, in run
runTouchApp()
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 504, in runTouchApp
EventLoop.window.mainloop()
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\core\window\window_sdl2.py", line 746, in mainloop
self._mainloop()
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\core\window\window_sdl2.py", line 478, in _mainloop
EventLoop.idle()
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 342, in idle
self.dispatch_input()
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 327, in dispatch_input
post_dispatch_input(*pop(0))
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\base.py", line 293, in post_dispatch_input
wid.dispatch('on_touch_up', me)
File "kivy\_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "C:\Users\uname\Anaconda3\lib\site-packages\kivymd\ripplebehavior.py", line 84, in on_touch_up
return super().on_touch_up(touch)
File "C:\Users\uname\Anaconda3\lib\site-packages\kivymd\button.py", line 480, in on_touch_up
return super().on_touch_up(touch)
File "C:\Users\uname\Anaconda3\lib\site-packages\kivy\uix\behaviors\button.py", line 179, in on_touch_up
self.dispatch('on_release')
File "kivy\_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
File "kivy\_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
File "kivy\_event.pyx", line 1138, in kivy._event.EventObservers._dispatch
File "C:\Users\path\to\my\file\design.kv", line 59, in <lambda>
left_action_items: [['dots-vertical', lambda x: root.toggle_nav_drawer()]]
File "kivy\weakproxy.pyx", line 32, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'LayoutPy' object has no attribute 'toggle_nav_drawer'
我从一个单独的文件中导入了 kv代码.
I import the kv code from a separate file.
#:kivy 1.11.0
#:import MDNavigationDrawer kivymd.navigationdrawer.MDNavigationDrawer
#:import NavigationLayout kivymd.navigationdrawer.NavigationLayout
#:import NavigationDrawerDivider kivymd.navigationdrawer.NavigationDrawerDivider
#:import NavigationDrawerToolbar kivymd.navigationdrawer.NavigationDrawerToolbar
#:import NavigationDrawerSubheader kivymd.navigationdrawer.NavigationDrawerSubheader
#:import MDToolbar kivymd.toolbar.MDToolbar
<ContentNavigationDrawer@MDNavigationDrawer>:
drawer_logo: 'src/LinguIcon.png'
NavigationDrawerSubheader:
text: "Menu:"
<LayoutPy>:
orientation: 'vertical'
scr_mngr: scr_mngr
NavigationLayout:
id: nav_layout
ContentNavigationDrawer:
id: nav_drawer
name: 'nav_drawer'
NavigationDrawerToolbar:
title: 'Options'
NavigationDrawerIconButton:
icon: 'settings'
text: 'Select Language'
on_release: root.open2ndScreen('screen_card')
NavigationDrawerIconButton:
icon: 'close'
text: 'Exit'
on_release: root.exit()
NavigationDrawerIconButton:
icon: 'face'
text: 'Contact the developer'
on_release: root.sendDevHint()
BoxLayout:
orientation: 'vertical'
MDToolbar:
id: toolbar
title: 'Menu'
md_bg_color: app.theme_cls.primary_color
background_palette: 'Primary'
background_hue: '500'
left_action_items: [['dots-vertical', lambda x: root.toggle_nav_drawer()]]
Widget:
ScreenManager:
id: scr_mngr
screen_main: screen_main
Screen:
id: screen_main
name: 'screen_main'
input_words: input_words
lbl: lbl
btn: btn
FloatLayout:
### A few widgets ###
Screen:
id: screen_card
name: 'screen_card'
FloatLayout:
### A few widgets ###
Python代码:
import sys
import kivy
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window
from kivymd.theming import ThemeManager
from kivymd.label import MDLabel
from kivymd.textfields import MDTextField, MDTextFieldClear, MDTextFieldRect, MDTextFieldRound
from kivy.lang import Builder
from kivymd.navigationdrawer import MDNavigationDrawer, NavigationDrawerIconButton, NavigationLayout
from kivy.properties import ObjectProperty
from kivymd.toast import toast
kivy.require('1.11.0')
class LayoutPy(FloatLayout):
def __init__(self, **kwargs):
super(LayoutPy, self).__init__(**kwargs)
self.scr_mngr = ObjectProperty(None)
self.build_nav_btns()
def callback(self, instance, value):
toast("Pressed item menu %d" % value)
def exit(self):
sys.exit(1)
def build_nav_btns(self):
btns = ["Select Language", "Contact the developer", "Exit"]
for count, btn in enumerate(btns):
if count == 1:
self.ids.nav_drawer.add_widget(
NavigationDrawerIconButton(
icon='settings', text=btn,
on_release=lambda x, btn: self.callback(x, btn)))
elif count == 2:
self.ids.nav_drawer.add_widget(
NavigationDrawerIconButton(
icon='face', text=btn,
on_release=lambda x, btn: self.callback(x, btn)))
elif count == 3:
self.ids.nav_drawer.add_widget(
NavigationDrawerIconButton(
icon='close', text=btn,
on_release=lambda x: self.exit()))
Builder.load_file("design.kv")
class KivyGUI(App):
theme_cls = ThemeManager()
theme_cls.primary_palette = ("Teal")
title = ("App")
def build(self):
c = LayoutPy()
return c
if __name__ == "__main__":
KivyGUI().run()
我削减了很多 Python代码，对您来说它更加清晰了.我不认为这是模块本身的问题，因为 KivyMD示例代码对我来说很好(这也是我运行该解决方案时的样子).我认为问题是我的LayoutPy类从没有toggle_nav_drawer对象的FloatLayout继承...但是现在我不知道如何在现有代码中实现合适的解决方案(我尝试了2天现在).如果您需要整个代码(添加NavigationDrawer之前一切都可以正常工作)，则可以看看
I cut a lot of Python code so it is a bit more clear for you. I don't think that it is a problem with the module itself because the KivyMD example code works fine for me (Thats also what the solution should look like when I run it). I think the problem is that my LayoutPy class inherits from FloatLayout which has no toggle_nav_drawer object... but I have no idea now how I could implement a suitable solution into my existing code (I am trying for 2 days now). If you need the whole code (everything almost worked fine before adding the NavigationDrawer) you can take a look here.
非常感谢！
推荐答案
错误-AttributeError
left_action_items: [['dots-vertical', lambda x: root.toggle_nav_drawer()]]
File "kivy\weakproxy.pyx", line 32, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'LayoutPy' object has no attribute 'toggle_nav_drawer'
根本原因
对象LayoutPy没有属性toggle_nav_drawer，因为toggle_nav_drawer是在LayoutPy的实例化子级NavigationLayout:中定义的.
Root Cause
The object, LayoutPy does not has an attribute toggle_nav_drawer because the toggle_nav_drawer is defined in the instantiated child, NavigationLayout: of LayoutPy.
用root.ids.nav_layout.toggle_nav_drawer()
BoxLayout:
orientation: 'vertical'
MDToolbar:
id: toolbar
title: 'Menu'
md_bg_color: app.theme_cls.primary_color
background_palette: 'Primary'
background_hue: '500'
left_action_items: [['dots-vertical', lambda x: root.ids.nav_layout.toggle_nav_drawer()]]
输出
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