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+--- Thread: Inserting Python Buttons into KV Files (/thread-44026.html)
Inserting Python Buttons into KV Files - edand19941 - Feb-19-2025
I am generating buttons with a loop in a py file with the code below. The TileLayout class generates a StackLayout filled with buttons with an on_press callback function.
PY FILE-------------------------------
from kivy.uix.stacklayout import StackLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from MathCrunchPkg import PackArray
from kivy.app import App
from kivy.config import Config
Config.set('graphics', 'resizable', True)
NUM_COLS = 15
NUM_ROWS = 10
TILE_ARRAY = []
TILE_ARRAY = PackArray.fill_arr(NUM_ROWS, NUM_COLS)
class TileMain(BoxLayout):
def on_enter(self):
print("ENTERED")
def tile_select(self):
print("SELECTED")
class TileLayout(StackLayout): #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
def __init__(self, **kwargs):
super().__init__(**kwargs)
for j in range(0,NUM_ROWS):
for i in range(0,NUM_COLS):
bt = Button()
bt.text=str(TILE_ARRAY[j][i][2])
bt.size_hint=(1/NUM_COLS,1.81/NUM_ROWS)
bt.background_color = 1,0,0,.6
bt.on_press = TileMain.tile_select(self) #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
bt.font_size = 42
self.add_widget(bt)
class MathCrushApp(App):
pass
if __name__ == "__main__":
MathCrushApp().run()-------------------------------------------The accompaning kv file follows.
KV FILE------------------------------------
TileMain: # this is the root widget, use this to set the background
orientation: "vertical"
canvas.before:
Color:
rgba: 1,1,1,1
Rectangle:
source: "gameboard.png"
size: self.size
pos: self.pos
TileLayout: #@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@:
FloatLayout:
orientation: "horizontal"
Label:
text: "Attempts"
size_hint: 0.1,120/640
pos: "43dp", "0dp"
color: 0,0,0,1
font_size: 40
background_color: (1, 1, 1, 0)
canvas.before:
Color:
rgba: self.background_color
Rectangle:
size: self.size
pos: self.pos------------------------------------------------------------------------------When executed in pycharm, I get this error messsage:
Error: File "C:\Users\eanderso\PycharmProjects\PythonProject2\.venv\lib\site-packages\kivy\uix\behaviors\button.py", line 151, in on_touch_down
self.dispatch('on_press')
File "kivy\\_event.pyx", line 731, in kivy._event.EventDispatcher.dispatch
TypeError: 'NoneType' object is not callable RE: Inserting Python Buttons into KV Files - deanhystad - Feb-19-2025
Please post the entire error message, including the full traceback.
I think the problem is that you bind the button to a class instead of an instance to a class. TileMain cannot tile_select. You need to create an instance of TileMain and bind the instance.tile_select to your button.
RE: Inserting Python Buttons into KV Files - menator01 - Feb-19-2025
Here is an example of creating kivy buttons
https://python-forum.io/thread-42326-post-179292.html#pid179292
RE: Inserting Python Buttons into KV Files - buran - Feb-19-2025
bt.on_press = TileMain.tile_select(self)here you call
tile_select() method of TileMain class and bind return value (which is None) to bt.on_pres. And None is not callable.