Jérémy Jérémy - 3 years ago 200
Python Question

Empty list of ids in a Kivy GridLayout

I am trying to develop a toy app with Kivy.

So far I have a grid of 9 x 9

TextInput
widgets that have been added programmatically to a
GridLayout
(I refer to it by the id "grid" in my kv file).

For some reason, although I am assigning an id to each of the
TextInput
widgets, the ids dictionary that I get in
the get_widget_from_id
is empty.

What am I missing?

main.py

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.textinput import TextInput
from kivy.clock import Clock

class SudokuGame(Widget):
# Initialize the grid of text inputs
def __init__(self, **kwargs):
super().__init__(**kwargs)

grid = self.ids["grid"]
for i in range(81):
row = i // 9
col = i % 9
grid.add_widget(TextInput(id = str(row) + "-" + str(col)))

# Try to retrieve one of the widgets from its id
def get_widget_from_id(self, *args):
print(self.ids["grid"].ids)

class SudokuApp(App):
def build(self):
game = SudokuGame()
Clock.schedule_once(game.get_widget_from_id)
return game

if __name__ == '__main__':
SudokuApp().run()


sudoku.kv

#:kivy 1.9.1

<TextInput@SudokuGame>:
text: ""
font_size: 0.7 * self.width
padding: 0.3 * self.width, (self.height - self.line_height) / 2
input_filter: lambda text, from_undo: text if ( 0 < int(text) < 10 and len(self.text) == 0 ) else ""
multiline: False
cursor_color: [0, 0, 0, 0]

<SudokuGame>:
canvas.before:
Color:
rgb: 1, 1, 1
Rectangle:
pos: self.pos
size: self.size
BoxLayout:
orientation: "vertical"
size: root.size
GridLayout:
id: grid
rows: 9
cols: 9
line_size: 6
canvas:
Color:
rgb: 0, 0, 0
Rectangle:
pos: self.x + self.width / 3 - self.line_size / 2, self.y
size: self.line_size, self.height
Rectangle:
pos: self.x + 2 * self.width / 3 - self.line_size / 2, self.y
size: self.line_size, self.height
Rectangle:
pos: self.x, self.y + self.height / 3 - self.line_size / 2
size: self.width, self.line_size
Rectangle:
pos: self.x, self.y + 2 * self.height / 3 - self.line_size / 2
size: self.width, self.line_size
BoxLayout:
orientation: "horizontal"
size_hint: 1, 0.1
Button:
text: "Solve"
Button:
text: "Clear"

Answer Source

The ids dict is populated only from kv ids. The Kivy property that widgets have is actually unrelated, and I'm not sure if it's used for anything.

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