Constantly updating label-text (GridLayout)

[mg]

Hey! I'm pretty new to Kivy so please be kind and patient. 

With the help of GODS and Kivy i want to create this amazing live-dashboard showing the actual amount of projects in our local project-folders

production

-----P33203-Projectname

-----P33204-Projectname

-----P33205-Projectname

post-production

-----P33208-Projectname

-----P33212-Projectname

GOAL:

production: 3 (projects)

post-production: 2 (projects)

finished: 231 (projects)

I just want python to crawl through the folders (maybe every 5 seconds) counting the projects and. Kivy only had one task... update the lables-texts.

Why can't i just say time.sleep(x). Python was so easy before Kivi showed up and destroyed ALL my dreams. :D

BUT now since 6 hours... I really tried everything... I am frustrated and confused.

I tried the clock thingy and sall the other funstuff but somehow i did not manage to update the lable text in a constant way.

HELP!

THANK YOU SO MUCH! 

PS: No kv-files please. i'm not ready for that!

Code hier eingeben...#!/usr/bin/env python3

# -*- coding: utf-8 -*-

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button

class MeinLayout(GridLayout):
    def __init__(self, **kwargs):
        super(MeinLayout, self).__init__(**kwargs)

        self.cols = 1
        self.top1 = GridLayout()
        self.top1.cols = 2
        self.top2 = GridLayout()
        self.top2.cols = 5
        self.add_widget(self.top1)

        titel = "Dashboard"

        self.top1.add_widget(Label(text=titel, font_size=60))
        self.add_widget(self.top2)
        self.top2.add_widget(Label(text="Step1", font_size=30))
        self.top2.add_widget(Label(text="Step2", font_size=30))
        self.top2.add_widget(Label(text="Step3", font_size=30))
        self.top2.add_widget(Label(text="Step4", font_size=30))
        self.top2.add_widget(Label(text="Step5", font_size=30))

        self.top2.add_widget(Label(text="12", font_size=30))
        self.top2.add_widget(Label(text="3", font_size=30))
        self.top2.add_widget(Label(text="34", font_size=30))
        self.top2.add_widget(Label(text="32", font_size=30))
        self.top2.add_widget(Label(text="3", font_size=30))

        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))

        self.button1 = Button(text="update",font_size=30)
        self.add_widget(self.button1)

        def crawl():
            pass
            ### crawling local folders###
            #returning integer values for every step
            #step1 = 3
            #step2 = 2

class epicbrain(App):
    def build(self):
        return MeinLayout()

if __name__ == "__main__":
    epicbrain().run()

[Elliot Garbus]

Here are 2 key things you need to do:

1. use Clock.schedule_interval() to schedule your crawl method. Read: https://kivy.org/doc/stable/api-kivy.clock.html?highlight=clock#module-kivy.clock
2. Make the values on the screen kivy Numeric properties.  Then when you update the value, the display will automatically update. Read : https://kivy.org/doc/stable/api-kivy.properties.html

 

Don’t fear kv, it makes the layout of widgets very effective.  If you need more explicit help, let me know.

 

 

From: mg
Sent: Monday, November 25, 2019 8:03 PM
To: Kivy users support
Subject: [kivy-users] Constantly updating label-text (GridLayout)

 

 

Hey! I'm pretty new to Kivy so please be kind and patient. 

 

With the help of GODS and Kivy i want to create this amazing live-dashboard showing the actual amount of projects in our local project-folders

 

production

-----P33203-Projectname

-----P33204-Projectname

-----P33205-Projectname

 

post-production

-----P33208-Projectname

-----P33212-Projectname

 

GOAL:

production: 3 (projects)

post-production: 2 (projects)

finished: 231 (projects)

 

I just want python to crawl through the folders (maybe every 5 seconds) counting the projects and. Kivy only had one task... update the lables-texts.

Why can't i just say time.sleep(x). Python was so easy before Kivi showed up and destroyed ALL my dreams. :D

 

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[mg]

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button

from kivy.clock import Clock
from kivy.event import EventDispatcher

class MeinLayout(GridLayout):
    def __init__(self, **kwargs):
        super(MeinLayout, self).__init__(**kwargs)

        #gogogo = EventDispatcher()
        #gogogo.register_event_type('my_callback')

        self.cols = 1
        self.top1 = GridLayout()
        self.top1.cols = 2
        self.top2 = GridLayout()
        self.top2.cols = 5
        self.add_widget(self.top1)

        titel = "Dashboard"

        self.top1.add_widget(Label(text=titel, font_size=60))
        self.add_widget(self.top2)

        self.top2.add_widget(Label(text="Step1", font_size=30))
        self.top2.add_widget(Label(text="Step2", font_size=30))
        self.top2.add_widget(Label(text="Step3", font_size=30))
        self.top2.add_widget(Label(text="Step4", font_size=30))
        self.top2.add_widget(Label(text="Step5", font_size=30))

        self.value1 = Label(text="value",font_size=30)
        self.top2.add_widget(self.value1)

        self.value2 = Label(text="value",font_size=30)
        self.top2.add_widget(self.value2)

        self.value3 = Label(text="value",font_size=30)
        self.top2.add_widget(self.value3)

        self.value4 = Label(text="value",font_size=30)
        self.top2.add_widget(self.value4)

        self.value5 = Label(text="value",font_size=30)
        self.top2.add_widget(self.value5)

        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))
        self.add_widget(Label(text=" ", font_size=60))

        def my_callback1(dt):
            global a
            import random
            a = str(random.randrange(0,100))
            self.value1.text=a

        def my_callback2(dt):
            global b
            import random
            b = str(random.randrange(0,100))
            self.value2.text=b

        def my_callback3(dt):
            global c
            import random
            c = str(random.randrange(0,100))
            self.value3.text=c

        def my_callback4(dt):
            global d
            import random
            d = str(random.randrange(0,100))
            self.value4.text=d

        def my_callback5(dt):
            global e
            import random
            e = str(random.randrange(0,100))
            self.value5.text=e


        # call my_callback every 0.5 seconds
        Clock.schedule_interval(my_callback1, 0.5)
        Clock.schedule_interval(my_callback2, 0.5)
        Clock.schedule_interval(my_callback3, 0.5)
        Clock.schedule_interval(my_callback4, 0.5)
        Clock.schedule_interval(my_callback5, 0.5)

class epicbrain(App):
    def build(self):
        return MeinLayout()

if __name__ == "__main__":
    epicbrain().run()

Thanks a lot for your help!!!

It works now.

But I'm not sure if this was Kivy's plan how I solved it. Do you think my code is "ok"? :)

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[Elliot Garbus]

I put my implementation below.  Happy to answer any questions.

 

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.clock import Clock
from kivy.properties import StringProperty  # Use the String Property
from kivy.lang.builder import Builder
import random


kv = """
<BigLabel30@Label>:
    font_size: 30

<BigLabel60@Label>:  # This defined a class BigLable60, derived from Label to avoid typing the same font_size 5 times.
    font_size: 60

MeinLayout:
    orientation: 'vertical'
    Label:
        size_hint_y: 10
        text: 'Dashboard'
        font_size: 60
    GridLayout:
        size_hint_y: 4
        cols: 5
        BigLabel30:
            text: 'Step 1'
        BigLabel30:
            text: 'Step 2'
        BigLabel30:
            text: 'Step 3'
        BigLabel30:
            text: 'Step 4'
        BigLabel30:
            text: 'Step 5'
    GridLayout:
        cols: 5
        size_hint_y: 10
        BigLabel60:
            text: root.a   # root.x refers the properties defined in the class.  They update automatically.
        BigLabel60:
            text: root.b
        BigLabel60:
            text: root.c
        BigLabel60:
            text: root.d
        BigLabel60:
            text: root.e 
    BoxLayout:
        size_hint_y: 20        # This is for spacing

"""


class MeinLayout(BoxLayout):
    a = StringProperty('value')  # you would give these variables meaningful names...
    b = StringProperty('value')  # This sets the initial value to 'value'
    c = StringProperty('value')
    d = StringProperty('value')
    e = StringProperty('value')

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        Clock.schedule_interval(self.my_callback1, 0.5)

    def my_callback1(self, dt):  # call my_callback every 0.5 seconds
        self.a = str(random.randrange(0, 100))
        self.b = str(random.randrange(0, 100))
        self.c = str(random.randrange(0, 100))
        self.d = str(random.randrange(0, 100))
        self.e = str(random.randrange(0, 100))


class EpicBrain(App):
    def build(self):
        return Builder.load_string(kv)


if __name__ == "__main__":
    EpicBrain().run()

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