I dont want to do this:
class SmashLadderApp(MDApp):
def build(self):
return Builder.load_file("View.kv")
but something like this:
class WindowManager(ScreenManager):
pass
#kv =Builder.load_file("View.kv")
#add screen widgits and load file
wm = WindowManager()
screens = [LoginPage(name="LoginPageID"),LadderPage(name="LadderPageID"), RegisterPage(name ="RegisterPageID")]
for screen in screens:
wm.add_widget(screen)
#starting page
wm.current = "LoginPageID"
class SmashLadderApp(MDApp):
def build(self):
kv =Builder.load_file("View.kv")
return wm
SmashLadderApp().run()
The bottom returns a blank window. How do I specify a Builder then have the widgits layout in the kv file? I want to handle the events in main. The commented outkv =Builder.load_file("View.kv") in the second snippet is how I thought you could accomplish this but gives me an error.
I'm pretty sure this works in Kivy but not KivyMD. Code pasted after as well. For the sake of readability, the code is posted here:
Python (file_name= Display.py): https://paste.nextcord.dev/?id=1659041664901348
KV file (file_name= View.kv): https://paste.nextcord.dev/?id=1659041570568365
Display.py:
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
#All functions/method handles
class LoginPage(Screen):
def register(self):
wm.current="RegisterPageID"
class LadderPage(Screen):
def user_page(self):
pass
def mod_page(self):
pass
def dev_page(self):
pass
class RegisterPage(Screen):
pass
class WindowManager(ScreenManager):
pass
#kv =Builder.load_file("View.kv")
#add screen widgits and load file
wm = WindowManager()
screens = [LoginPage(name="LoginPageID"),LadderPage(name="LadderPageID"), RegisterPage(name ="RegisterPageID")]
for screen in screens:
wm.add_widget(screen)
#starting page
wm.current = "LoginPageID"
class SmashLadderApp(MDApp):
def build(self):
kv =Builder.load_file("View.kv")
return wm
SmashLadderApp().run()
View.kv:
#:kivy 2.1
# WindowManager:
# LoginPage:
# RegisterPage:
# LadderPage:
#Default widgits, almost like methods
<MDLabel>:
size_hint: .2,.1
color: 0,0,0,1
bold: True
<MDTextField>:
hint_text_color_normal:1,1,1,1
# color_mode: "custom"
hint_text_color_focus: 1,1,1,1
helper_text_color_focus: 1,1,1,1
line_color_normal: 1,1,1,1
line_color_focus: 1,1,1,1
# icon_right: "KirbyHeart.ico"
<MDRectangleFlatButton>:
theme_text_color: "Custom"
text_color: 1,1,1,1
line_color: 1,1,1,0
#pages
<LoginPage>:
name: "LoginPageID"
#create opacity
canvas:
Color:
rgba: 0.1,0.1,0.1,.8
#creates background
Rectangle:
source: "ssbu.jpg"
pos: self.pos
size: self.size
FloatLayout:
#Places kirby heart in certain location, don't know how to make Kirby stay next to text input
Image:
source:"KirbyHeart.ico"
pos_hint: {"center_x": .65, "center_y": .50}
#just a label
MDLabel:
#can use mark up language
markup: True
text: "[font=times]Smash Ladder\n Login[/font]"
font_size: 20
#relative size to window
pos_hint:{"center_x":.52,"center_y": .58}
color: "white"
MDTextField:
id: usernameID
hint_text: "please enter your username"
helper_text: "Click register if you haven't yet"
helper_text_mode:"on_focus"
pos_hint:{"center_x":.5, "center_y":.5}
size_hint_x: None
width: 200
MDTextField:
id: passwordID
hint_text: "Enter your password. "
pos_hint:{"center_x":.5, "center_y":.4}
size_hint_x: None
width: 200
MDRectangleFlatButton:
text: "Register?"
text_color: 0,0,1,1
pos_hint:{"center_x":.595, "center_y":.35}
size_hint_x: None
on_press:
root.manager.transition.direction: "up"
root.register()
on_release:
<LadderPage>:
name: "LadderPageID"
<RegisterPage>:
#Testing Layout
name: "RegisterPageID"
FloatLayout:
Image:
source:"KirbyHeart.jpg"
pos_hint: {"center_x": .5, "center_y": .5}
MDRectangleFlatButton:
id: jokeID
text: "Register?"
text_color: 0,0,1,1
pos_hint:{"center_x":.59
if I remove Builder object from the build method and insert it below the WindowManager class; I will get this error:
Traceback (most recent call last):
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivymd\theming.py", line 1216, in __init__
App.get_running_app().property("theme_cls", True),
AttributeError: 'NoneType' object has no attribute 'property'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "c:\Users\Chapm\GitHub\Ladder-matchmaking\UI\Display.py", line 30, in <module>
screens = [LoginPage(name="LoginPageID"),LadderPage(name="LadderPageID"), RegisterPage(name ="RegisterPageID")]
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\uix\relativelayout.py", line 274, in __init__
super(RelativeLayout, self).__init__(**kw)
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\uix\floatlayout.py", line 65, in __init__
super(FloatLayout, self).__init__(**kwargs)
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\uix\layout.py", line 76, in __init__
super(Layout, self).__init__(**kwargs)
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\uix\widget.py", line 366, in __init__
self.apply_class_lang_rules(
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\uix\widget.py", line 470, in apply_class_lang_rules
Builder.apply(
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\lang\builder.py", line 540, in apply
self._apply_rule(
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\lang\builder.py", line 662, in _apply_rule
self._apply_rule(
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivy\lang\builder.py", line 658, in _apply_rule
child = cls(__no_builder=True)
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivymd\uix\label\label.py", line 327, in __init__
super().__init__(**kwargs)
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivymd\uix\behaviors\declarative_bahavior.py", line 302, in __init__
super().__init__(**kwargs)
File "C:\Users\Chapm\AppData\Local\Programs\Python\Python310\lib\site-packages\kivymd\theming.py", line 1224, in __init__
raise ValueError(
ValueError: KivyMD: App object must be initialized before loading root widget. See https://github.com/kivymd/KivyMD/wiki/Modules-Material-App#exceptions
Just move everything to build as,
def build(self):
Builder.load_file("View.kv") # You can place it outside too.
wm = WindowManager()
screens = [LoginPage(name="LoginPageID"),LadderPage(name="LadderPageID"), RegisterPage(name ="RegisterPageID")]
for screen in screens:
wm.add_widget(screen)
return wm
Remember now, wm is not global anymore, so something like this wm.some_prop_or_method will raise NameError.