How can I access to a label/id of another class using python or kivy and avoiding te error below? I've searched in other posts and I've found it isn't possible to refer to another class by the root one... Hower, I don't know any other method to do that. I hope you could help me. Thanks in advance.
FaceRec.py
Libraries
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager,Screen
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.settings import SettingsWithSidebar
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.actionbar import ActionBar
from kivy.logger import Logger
from kivy.config import Config
Setting the screen size
Config.set('graphics', 'width', '850')
Config.set('graphics', 'height', '850')
HomeScreen classes
class ScreenManagement(ScreenManager):
pass
class HomeScreen(Screen):
pass
class HomeActionBar(ActionBar):
pass
class TitleLabel(Label):
pass
class StatusBoxLayout(BoxLayout):
pass
class ErrorsBoxLayout(BoxLayout):
pass
Main class
class FaceRecApp(App):
def build(self):
root = HomeScreen()
Logger.info('FaceRec.py: FaceRec.kv loaded')
self.settings_cls = MySettingsWithSidebar
Logger.info('FaceRec.py: MySettingsWithSidebar loaded')
status = root.ids.StatusBoxLayout.status
status.font_size = float(self.config.get('General', 'font_size'))
label = root.ids.label
label.font_size = float(self.config.get('General', 'font_size'))
return root
def build_config(self, config):
config.setdefaults('General', {'text': 'Default Hello','font_size': 20})
def build_settings(self, settings):
settings.add_json_panel('General', self.config, 'Settings.json')
def on_config_change(self, config, section, key, value):
Logger.info("FaceRec.py: App.on_config_change: {0}, {1}, {2}, {3}".format(config, section, key, value))
if section == "General":
if key == "text":
self.root.ids.label.text = value
elif key == 'font_size':
self.root.ids.label.font_size = float(value)
self.root.ids.StatusBoxLayout.status = float(value)
def close_settings(self, settings):
Logger.info("FaceRec.py: App.close_settings: {0}".format(settings))
super(FaceRecApp, self).close_settings(settings)
Sidebar settings
class MySettingsWithSidebar(SettingsWithSidebar):
def on_close(self):
Logger.info('FaceRec.py: MySettingsWithSidebar.on_close')
def on_config_change(self, config, section, key, value):
Logger.info(
"FaceRec.py: MySettingsWithSidebar.on_config_change: "
"{0}, {1}, {2}, {3}".format(config, section, key, value))
Execute
if __name__ == '__main__':
FaceRecApp().run()
FaceRec.kv
ScreenManagement:
HomeScreen:
<HomeActionBar>:
id: HomeActionBar
pos_hint: {'bottom':0}
ActionView:
use_separator: True
ActionPrevious:
title: 'Home'
with_previous: False
ActionOverflow:
ActionButton:
text: 'Settings'
icon: 'settings.png'
background_down: 'settings.png'
on_release:
app.open_settings()
<TitleLabel>:
id: TitleLabel
text: '[b]FaceRec[/b] - [i]The Face Recognition Project[/i]'
color: 0.0,0.3,1,1
markup: True
font_size: 38
<StatusBoxLayout>:
orientation: 'horizontal'
#padding: 100
Label:
id: status
text: 'Status: '
font_size: 20
Label:
id: status_value
text: 'Error'
font_size: 20
color: 1,0,0,1
<ErrorsBoxLayout>:
id: ErrorsBoxLayout
orientation: 'horizontal'
#padding: 100
Label:
id: errors
text: 'Errors No: '
font_size: 20
Label:
id: errors_value
text: '...'
font_size: 20
<HomeScreen>:
id: HomeScreen
BoxLayout:
orientation: 'vertical'
HomeActionBar:
TitleLabel:
BoxLayout:
cols: 2
orientation: 'vertical'
StatusBoxLayout:
ErrorsBoxLayout:
Label:
id: label
text: 'Does it run?'
Settings.json
[
{
"type": "string",
"title": "Label caption",
"desc": "Choose the text that appears in the label",
"section": "General",
"key": "text"
},
{
"type": "numeric",
"title": "Label font size",
"desc": "Choose the font size the label",
"section": "General",
"key": "font_size"
}
]
I've tried to access to label variable (FaceRecApp, build and on_config_change functions) and the program has run properly. When I've changed the font size of the label in settings, changes has been applied in the HomeScreen. Then I've added the following lines of code:
In build():
status = root.ids.StatusBoxLayout.status
status.font_size = float(self.config.get('General', 'font_size'))
and in on_config_change():
self.root.ids.StatusBoxLayout.status = float(value)
The result has been an error:
[INFO ] [Logger ] Record log in C:\***\.kivy\logs\kivy_17-04-17_109.txt
[INFO ] [Kivy ] v1.9.1
[INFO ] [Python ] v2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 20:53:40) [MSC v.1500 64 bit (AMD64)]
[INFO ] [Factory ] 179 symbols loaded
[INFO ] [Image ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [OSC ] using <thread> for socket
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] OpenGL version <4.5.0 NVIDIA 376.53>
[INFO ] [GL ] OpenGL vendor <NVIDIA Corporation>
[INFO ] [GL ] OpenGL renderer <GeForce ***/PCIe/SSE2>
[INFO ] [GL ] OpenGL parsed version: 4, 5
[INFO ] [GL ] Shading version <4.50 NVIDIA>
[INFO ] [GL ] Texture max size <16384>
[INFO ] [GL ] Texture max units <32>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[INFO ] [FaceRec.py ] FaceRec.kv loaded
[INFO ] [FaceRec.py ] MySettingsWithSidebar loaded
Traceback (most recent call last):
File "C:/***/PycharmProjects/face_recognition_2/FaceRec.py", line 114, in <module>
FaceRecApp().run()
File "C:\Python27\lib\site-packages\kivy\app.py", line 802, in run
root = self.build()
File "C:/***/PycharmProjects/face_recognition_2/FaceRec.py", line 65, in build
status = root.ids.StatusBoxLayout.status
File "kivy\properties.pyx", line 757, in kivy.properties.ObservableDict.__getattr__ (kivy\properties.c:11882)
AttributeError: 'super' object has no attribute '__getattr__'
Process finished with exit code 1
I've already read this post (and many others...): How to access id/widget of different class from a kivy file (.kv)? but my program hasn't run yet.
Again, thanks for your support.
