Python kivy [CRITICAL] [Clock ] Warning, too much iteration done before the next frame-CodePudding

I'm making a calendar app in for mobile in kivy and wantto make a scrollview for a stack layout but keep getting this error and I don't know why

python code

from kivymd.app import MDApp
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.stacklayout import StackLayout
from calendar import monthrange
import calendar



year = 2022
month_int = 11
num_days = monthrange(year, month_int)[1]
weekheader = str(calendar.weekheader(3))
days = weekheader.split(" ")
days_length = len(days)
month = calendar.monthcalendar(year, month_int)
print(month)
start_day = month[0].count(0)
print(start_day)



class GridLayoutExample(GridLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        for l in range(2):
            label4 = Label()
            self.add_widget(label4)
        
        button2 = Button(text=str(month_int))
        self.add_widget(button2)
        button3 = Button(text=str(year))
        self.add_widget(button3)
        
        for k in range(3):
            label3 = Label()
            self.add_widget(label3)
        
        for j in range(days_length):
            label1 = Label(text=days[j], color=(0, 0, 0, 1))
            self.add_widget(label1)
        
        for g in range(start_day):
            label2 = Label()
            self.add_widget(label2)
        
        for i in range(num_days):
            button = Button(text=str(i   1))
            button.my_id = str(i   1)   "-"   str(month_int)   "-"   str(year)
            self.ids[str(i   1)   "-"   str(month_int)   "-"   str(year)] = button
            self.add_widget(button)


class LayoutExample(StackLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        for l in range(10):
            label4 = Label(text="zeer plezant \n \n \n ha \n haha", size = self.size, color=(0, 0, 0, 1), size_hint=(None, None))
            self.add_widget(label4)
            button = Button(text="verwijder")
            self.add_widget(button)
            button = Button(text="wijzig")
            self.add_widget(button)


class agenda1(MDApp):
    pass


agenda1().run()

kv file

#:kivy 1.0
PageLayoutExample:

<PageLayoutExample@PageLayout>:
    GridLayoutExample:
    ScrollViewExample:


<ScrollViewExample@ScrollView>:
    LayoutExample:
        



<GridLayoutExample>:
    #left-right  top-bottom
    cols: 7
    orientation: "lr-tb"
    size: root.minimum_width, root.minimum_height
    padding: ("20dp", "20dp", "20dp", "20dp")


<LayoutExample>:
    cols: 1
    orientation: "lr-tb"
    padding: ("20dp", "20dp", "20dp", "20dp")
    size_hint: 1, None
    height: self.minimum_height

Did I do something wrong in my code?

I want the scrollview to scroll as far as it has to to get all the data on the screen but not go any farther than that. because I iterate over an x amount task I don't really see a way to get less iterations in

CodePudding user response：

Because you are using height: self.minimum_height in your LayoutExample, you must provide definite sizes for its children.

The Buttons that you add to LayoutExample have the default size_hint of (1,1), so that causes an infinite loop in the LayoutExample layout calculations. It is trying to calculate its minimum_height, so each Button height gets set to the LayoutExample height, the LayoutExample then calculates and applies a new minimum height that will hold the Buttons. The Buttons then change their size to the new size of the LayoutExample, which triggers a new calculation by LayoutExample of its minimum_height....

The fix is just to specify a size for each Button, something like:

    for l in range(10):
        label4 = Label(text="zeer plezant \n \n \n ha \n haha", size=self.size, color=(0, 0, 0, 1),
                       size_hint=(None, None))
        self.add_widget(label4)
        button = Button(text="verwijder", size_hint=(None, None), size=(100, 20))
        self.add_widget(button)
        button = Button(text="wijzig", size_hint=(None, None), size=(100, 20))
        self.add_widget(button)