Update a entire window Kivy in Python

[Sylsylval Green]

Hello,

I'm a very new user of kivy and I would like some help on a way to update a whole window.

I think it's possible but I'm not sure.

I've seen the Clock method but I don't know if it's the only way.

Here is a part of my programme, the second window must be update according to the file chosen.

Thank you in advance for your answers.

[Elliot Garbus]

What is the problem you having?  I changed the dir in the listdir call, and the code seems to be working.

 

 

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[Sylsylval Green]

Oh, sorry I really didn't explain myself well. The problem is that when a file button is clicked, the window called Open must take the name of the file. The first time, it works. But then, when you go back to the main window and that you ckick on an other file button, the name of the Open window is the same that the first time. I've try to remove all the widget because the build() fonction is activedd by the file button but it doesn't seem to work. 

The programme's folder is like that by the way :

 - sylsylval_test.py

 - fiche : - fiche1.txt

               - fiche2.txt

[Elliot Garbus]

There are a few things here to fix.  I’m surprised that this code works.  The class OpenWindow should be on the far left, not nested under the MainWIndow.

When the file is selected, you can use that to set a property on the other screen.

 

I would recommend using kv to setup your screens it would simplify things greatly. 

Give it a try – I’d be happy to help.

 

 

 

import os
from re import template
import kivy
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.uix.widget import Widget
from kivy.properties import ObjectProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.clock import Clock
from kivy.core.window import Window


class MainWindow(Screen):

    def build(self):
        self.name = 'Main'
        self.Box1 = BoxLayout(orientation='horizontal', padding=10)
        self.Box1.Gauche_Layout = GridLayout(cols=1, size_hint=(0.85, 1))
        self.Box1.Gauche_Layout.add_widget(Label(text="Fichiers déjà existants : ", size_hint=(1, 0.1)))
        self.Box1.Gauche_Layout.Fichier_Layout = GridLayout(cols=2)
        self.Mes_Boutons_fichier()
        self.Box1.Gauche_Layout.add_widget(self.Box1.Gauche_Layout.Fichier_Layout)
        self.Box1.add_widget(self.Box1.Gauche_Layout)
        self.add_widget(self.Box1)
        sm.add_widget(self)

    def Mes_Boutons_fichier(self):
        self.Liste_Boutons_fichier = []
        i = 0
        fichiers = os.listdir(".")  # finding files in folder
        for elt in fichiers:  # creating buttons for every files
            self.Liste_Boutons_fichier.append(Button(text=str(elt)))
            self.Liste_Boutons_fichier[i].bind(on_press=self.p)
            self.Box1.Gauche_Layout.Fichier_Layout.add_widget(self.Liste_Boutons_fichier[i])
            i += 1

    def p(self, instance):
        print(instance.text)
        r = instance.text  # r = name of the file chosen

        class OpenWindow(Screen):

            def build(self):
                self.name = 'Open'  # Name of the window

                self.box = BoxLayout(orientation='horizontal')
                self.box.side = BoxLayout(orientation='vertical')
                self.box.side.add_widget(Label(text=r))

                self.box.add_widget(self.box.side)
                self.box.box_dp = BoxLayout(orientation='horizontal')

                self.box.box_dp.btn = Button()
                self.box.box_dp.btn.bind(on_press=self.btn_f)
                self.box.box_dp.add_widget(self.box.box_dp.btn)

                self.box.add_widget(self.box.box_dp)
                self.add_widget(self.box)

                sm.add_widget(self)

            def btn_f(self, instance):
                sm.current = 'Main'

        Open = OpenWindow()
        Open.build()
        sm.current = 'Open'


sm = ScreenManager()


class MainFDRApp(App):

    def build(self):
        Main = MainWindow()
        Main.build()
        sm.current = 'Main'

        return sm


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

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/674ba8a1-90ea-47f3-b0b2-9e8a74592cccn%40googlegroups.com.

 

[Elliot Garbus]

Here is an alternative implementation using kv:

 

import os
from kivy.app import App
from kivy.uix.button import Button

from kivy.lang import Builder
from kivy.uix.screenmanager import 

Screen

kv = """
ScreenManager:
    id: sm
    MainWindow:
        name: 'Main'
    OpenWindow:
        name: 'Open'

<MainWindow>:
    BoxLayout:
        orientation: 'vertical'
        padding: 10
        Label:
            text: 'Fichiers déjà existants : '
            size_hint_y: None
            height: 24
        GridLayout:
            id: grid
            cols: 2

<OpenWindow>:
    BoxLayout:
        Label:
            id: filename
        Button:
            text: 'Home'
            on_release: root.manager.current = 'Main'
         
<FileButton>:
    on_release: 
        app.root.current = 'Open'
        app.root.get_screen('Open').ids.filename.text = self.text
        

"""


class FileButton(Button):
    pass


class MainWindow(Screen):

    def on_kv_post(self, base_widget):
        self.add_buttons()

    def add_buttons(self):
        for file in os.listdir('.'):
            self.ids.grid.add_widget(FileButton(text=file))


class OpenWindow(Screen):
    pass


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

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/60a7beac.1c69fb81.2612c.be3cSMTPIN_ADDED_MISSING%40gmr-mx.google.com.

 

[Sylsylval Green]

Thanks a lot ! I'll carefully read it and I'll get back in a few days (or maybe a week). For the moment, I stay without using kv but I think  I'll begin to use it a bit (so thanks for the help proposition). 

The indented class was the technic I used to replace the update of the page (it is a homemade, so it is maybe why it's wobbly).