Binding values outside class

[mic...@morganfalls.com]

I'm trying to create a simple app (and in the process learn a little more about Kivy) but I can't seem to find much information on this specific subject.

I want to, for example, let the user be able to select a folder in the file system (in this case OS X or Linux) and then use python commands to do other things to that folder.  My issue is that since File Chooser is in a popup I can't figure out how to bind the label on the main screen to show the user selected folder.

Additionally, I'm unclear how to set the users choice to a variable that can be used in the additional python commands.

Could someone please help with the two lines noted below?

Thanks so much!

Michael

import kivy

from kivy.app import App

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.label import Label

from kivy.uix.button import Button

from kivy.uix.pagelayout import PageLayout

from kivy.properties import ObjectProperty

from kivy.uix.popup import Popup

from kivy.factory import Factory

from kivy.uix.textinput import TextInput

from kivy.uix.boxlayout import BoxLayout

from kivy.lang import Builder

import os

Builder.load_string("""

<MainScreen>:

BoxLayout:

orientation: 'vertical'

BoxLayout:

size_hint_y: None

height: 30

Button:

text: 'Choose Source'

on_release: root.load_source()

Label:

id: _selection

text: "name of chosen folder should appear here"

size_hint_y: .5

canvas.before:

Color:

rgb: .5,.5,.4

Rectangle:

pos: self.pos

size: self.size

Button:

text: 'GO'

on_release: root.GetFolderName()

<LoadDialog>:

BoxLayout:

size: root.size

pos: root.pos

orientation: "vertical"

FileChooserListView:

path: '/volumes'

dirselect: True

id: filechooser

filter: ['*.mov']

multiselect: True

on_selection: root.selected(filechooser.selection)

BoxLayout:

size_hint_y: None

height: 30

Button

text: "Cancel"

on_release: root.cancel()

Button

text: "Select"

on_release: print str(filechooser.selection[0])
###########################################The following line clearly does not work##################################

#on_release: MainScreen._selection.text = str(filechooser.selection[0])

on_release: root.cancel()

""")

class LoadDialog(FloatLayout):

cancel = ObjectProperty(None)

def selected(self, filename):

print "new folder selected"

class MainScreen(FloatLayout):

def dismiss_popup(self):

self._popup.dismiss()

def load_source(self):

content = LoadDialog(load=self.load, cancel=self.dismiss_popup)

self._popup = Popup(title="Select Source Folder", content=content,

size_hint=(0.9, 0.9))

self._popup.open()

def load(self, path, filename):

with open(os.path.join(path, filename[0])) as stream:

self.text_input.text = stream.read()

self.dismiss_popup()

################## I'd like to do a few python things with this but Can't figure out how to get variables from the dialog in Kivy to bind with this#########################

def GetFolderName(self, *args):

y = "name of chosen folder"

print y 

class FootageImport(App):

    def build(self):

        return MainScreen()

if __name__ == "__main__":

FootageImport().run()

[ZenCODE]

See below, not ideal but at least it works (I Hope!)

https://gist.github.com/Zen-CODE/63749afae7faf70a0de419f9e5f76360

[mic...@morganfalls.com]

It's fantastic.  Thanks!!

[Michael]

Allright.  I spent some more time on this and although the above example works (and was extremely helpful) I still can't seem to understand the most direct route to binding between classes.

I've been through the docs and forums but it's still a little fuzzy.

Using this very simple example below could someone please show what the most basic KV way to bind between these two Widget labels would be.

Thanks!!! 

import kivy

from kivy.app import App

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.label import Label

from kivy.uix.button import Button

from kivy.uix.pagelayout import PageLayout

from kivy.properties import ObjectProperty

from kivy.uix.popup import Popup

from kivy.factory import Factory

from kivy.lang import Builder

import os

Builder.load_string("""

<MainScreen>:

id:Mainscreen

FloatLayout:

id:Float1

BoxLayout:

orientation: 'vertical'

BoxLayout:

size_hint_y: None

spacing: 0

Button:

text: 'Choose Source'

on_release: root.load_source()

size_hint_y: 1

Label:

id: _selection

size_hint_y: .5

canvas.before:

Color:

rgb: .5,.5,.4

Rectangle:

pos: self.pos

size: self.size

Label:                #<<<<<---------------------------------------------------HERE!

id: _Log

text: "I'D LIKE THE POPUP TEXT TO BE BOUND TO THIS (ID:_Log2)"

<LoadDialog>:

##Works

BoxLayout:

size: root.size

pos: root.pos

orientation: "vertical"

FileChooserListView:

id: filechooser

BoxLayout:

size_hint_y: None

height: 30

Label:

id: _Log2                #<<<<<-------------------------------------------------HERE!

text: "I'D LIKE THIS TO BE BOUND TO THE MAIN WINDOW TEXT (ID:_Log)"

""")

#########################################################

#This defines the python code of the above widget.

class LoadDialog(FloatLayout):

selection = None

cancel = ObjectProperty(None)

class MainScreen(FloatLayout):

def dismissSource_popup(self):

self._popup.dismiss()

if self.content.selection is not None:

self.ids._selection.text = str(self.content.selection[0])

def load_source(self):

self.content = LoadDialog(load=self.load, cancel=self.dismissSource_popup)

self._popup = Popup(title="Select a Source Folder or file:",

content=self.content,

size_hint=(0.9, 0.9))

self._popup.open()

def load(self, path, filename):

with open(os.path.join(path, filename[0])) as stream:

self.text_input.text = stream.read()

self.dismiss_popup()

class SimpleBind(App):

def build(self):

return MainScreen()

if __name__ == "__main__":

SimpleBind().run()

[Michael]

Alright I've managed to solve this using ScreenManager to pipe information to the various windows.  I'm assuming this is the general solution to this.

Thanks!