Clock warning when using MDRectangleFlatButton and MDRaisedButton

Question

I am making a desktop application using kivy & kivymd and when creating the settings screen for the app I used two MDRectangleFlatButon and MDRaisedButtons but to make them scalable, I gave both of them a size_hint_x of .5 for each to take up half of the screen. However, as soon as the program starts I get this warning from kivy:

[CRITICAL] [Clock       ] Warning, too much iteration done before the next frame. Check your code, or increase the Clock.max_iteration attribute

the interesting part is that if I switch the current screen to the one that I defined them inside of it, the warning stops. Why am I getting this warning and how can I stop it? My python file:

from kivy.config import Config

Config.set('graphics', 'width', '850')
Config.set('graphics', 'height', '530')
Config.set('graphics', 'minimum_width', '850')
Config.set('graphics', 'minimum_height', '530')
from kivy.lang import Builder
from kivymd.uix.card import MDCard
from kivymd.uix.tab import MDTabsBase
from kivymd.app import MDApp


class SettingsTab(MDCard, MDTabsBase):
    pass

class Example(MDApp):

    def __init__(self, **kwargs):
        super(Example, self).__init__(**kwargs)
        self.kv = Builder.load_file("design.kv")

    def build(self):
        self.theme_cls.theme_style = "Dark"
        self.theme_cls.primary_palette = "Blue"
        self.theme_cls.accent_palette = "Teal"
        return self.kv


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

My kv file:

#:kivy 2.0.0
<SettingsTab>:
    orientation: "vertical"
    size_hint: .95, .95
    pos_hint: {"center_x": .5, "center_y": .5}
    border_radius: 5
    radius: [5]
    elevation: 20
BoxLayout:
    MDNavigationRail:
        color_active: app.theme_cls.primary_color
        MDNavigationRailItem:
            icon: "list-status"
            on_release:
                screens.current = "downloads_screen"
        MDNavigationRailItem:
            icon: "cog"
            on_release:
                screens.current = "settings"
        MDNavigationRailItem:
            icon: "information"
            on_release:
                screens.current = "activity_log"

    ScreenManager:
        id: screens
        Screen:
            name: "downloads_screen"
        Screen:
            name: "activity_log"
        Screen:
            name: "settings"
            MDTabs:
                SettingsTab:
                    title: "DOWNLOAD"
                SettingsTab:
                    title: "COLOR"
                    MDBoxLayout:
                        adaptive_height: True
                        orientation: "vertical"
                        padding: 10
                        MDLabel:
                            text: "Theme Manager: "
                            font_style: "H5"
                            padding_y: 10
                            size_hint_y: None
                            height: self.texture_size[1]
                        MDBoxLayout:
                            adaptive_height: True
                            spacing: 10
                            MDRectangleFlatButton:
                                text: "See Current Palette"
                                size_hint_x: .5
                            MDRaisedButton:
                                text: "Open Theme Picker"
                                size_hint_x: .5
                SettingsTab:
                    title: "INFO"

EDIT: Just to mention, I do not just want the warning go away, I want to stop the performance drop. Even if I didn't add size_hint to any of the buttons (which doesn't cause the error anymore), the app becomes very sluggish and slow. When resizing the program there is a huge delay and when the program starts it is really doing a number on my cpu and it won't change until I switch to that frame.

No idea why that is happening, but if you put your "settings" `Screen` as the first listed under `ScreenManager` in your `kv`, then it goes away. — John Anderson, Jun 10 '21 at 23:47
@JohnAnderson the problem is that I don't want the settings screen to be the first one that is shown — Omid Ki, Jun 11 '21 at 09:44
@JohnAnderson I updated the question to make my intention clearer — Omid Ki, Jun 11 '21 at 10:37

score 1 · Accepted Answer · answered Jun 11 '21 at 13:01

1

If you change the order of your Screens definition, so that the "settings" Screen is the first listed under ScreenManager in your kv, then the error messages go away. Then adding to the Example class definition:

def on_start(self):
    self.kv.ids.screens.transition = NoTransition()
    self.kv.ids.screens.current = 'downloads_screen'
    self.kv.ids.screens.transition = SlideTransition()

makes the downloads_screen appear first.

answered Jun 11 '21 at 13:01

John Anderson

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As of now, this seems to suffice. Thank you. – Omid Ki Jun 12 '21 at 08:00

Clock warning when using MDRectangleFlatButton and MDRaisedButton

1 Answers1