Progress bar in kivy can't update using loop

user_10320451 0
Viewed 1948

im traying to do a progress bar in kivy, i can build the app with it but it can't be udpated when i run a function (loop) how can i do this please ?

here is my code : import libraries :

from kivy.app import App

from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout

from kivy.uix.label import Label
from kivy.properties import ObjectProperty
from kivy.core.window import Window
from kivy.clock import Clock
from kivy.logger import Logger
from kivy.uix.progressbar import ProgressBar

My builder :

Builder.load_string("""
<RootWidget>:
    pb : pb
    some code here
        ActionView:       
            ActionPrevious:
                with_previous: False 
                ActionButton:
                    text: 'Run analysis'
                    color: 29/255, 185/255, 84/255, 1
                    on_release: root.clicked()
    BoxLayout:
        ProgressBar:
            id : pb
            min :0
            max :1
            pos_hint: {'x': .1}
            size_hint_x :.8
            size_hint_y :.5
            value: 0
        """)

other code with my update_bar function: 

class Myapp(BoxLayout):

    pb = ProgressBar()
    box = ObjectProperty()

    def __init__(self, *args, **kwargs):
        super(Myapp, self).__init__(*args, **kwargs)

    def update_bar(self,dt=None):
         self.ids.pb.value = self.ids.pb.value

here is the problem : the progress bar is not updated each iteration, but it take the last value (for i = 9999)

     def clicked(self):
        for i in range(10000) :
            self.ids.pb.value =  i/10000 
            Clock.schedule_interval(self.update_bar,0.5)
            self.update_bar()

Build my app : 

class EventScreen(App,Myapp):
    def on_stop(self):
        Logger.critical("Good bye")
    def build(self):
        return Myapp()
if __name__ == "__main__":
    EventScreen().run()

thank you in advance

kivy
1 Answers

Use Clock.create_trigger() to update progress bar.

Snippet

 def __init__(self, *args, **kwargs):
    super(Myapp, self).__init__(*args, **kwargs)
    self.update_bar_trigger = Clock.create_trigger(self.update_bar)

 def clicked(self):
    self.i = 0
    self.update_bar_trigger()

def update_bar(self, dt):
    if self.i <= 10000:
        self.ids.pb.value += self.i
        self.i += 1
        self.update_bar_trigger()
user_63660980
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