kivy select folder with FileChooser - kivy

Question

i want to add kivy filechooser into gridlayout https://kivy.org/docs/api-kivy.uix.filechooser.html
i apply documentation and use root widget for have list file, but it's not work, my all folders not appear to my window
i have my main class :
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.factory import Factory
from kivy.properties import ObjectProperty
from kivy.uix.popup import Popup
import os
class LoadDialog(FloatLayout):
load = ObjectProperty(None)
cancel = ObjectProperty(None)
class SaveDialog(FloatLayout):
save = ObjectProperty(None)
text_input = ObjectProperty(None)
cancel = ObjectProperty(None)
class Root(FloatLayout):
loadfile = ObjectProperty(None)
savefile = ObjectProperty(None)
text_input = ObjectProperty(None)
def dismiss_popup(self):
self._popup.dismiss()
def show_load(self):
content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load file", content=content,
size_hint=(0.9, 0.9))
self._popup.open()
def show_save(self):
content = SaveDialog(save=self.save, cancel=self.dismiss_popup)
self._popup = Popup(title="Save file", 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()
def save(self, path, filename):
with open(os.path.join(path, filename), 'w') as stream:
stream.write(self.text_input.text)
self.dismiss_popup()
class Editor(App):
pass
import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
class MyApp(App):
def build(self):
layout = BoxLayout(orientation='vertical')
root=Root()
root.show_load()
layout.add_widget(root)
return layout
if __name__ == '__main__':
MyApp().run()
i have only filechooser title, i have not folder or file in window why ?
the result :

Answer 1

You need to create a kv file, my.kv and some minor changes to the Python code. Please refer to the example for details.
Example
Python Script - main.py
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty
from kivy.uix.popup import Popup
import os
class LoadDialog(FloatLayout):
load = ObjectProperty(None)
cancel = ObjectProperty(None)
class SaveDialog(FloatLayout):
save = ObjectProperty(None)
text_input = ObjectProperty(None)
cancel = ObjectProperty(None)
class Root(FloatLayout):
loadfile = ObjectProperty(None)
savefile = ObjectProperty(None)
text_input = ObjectProperty(None)
def dismiss_popup(self):
self._popup.dismiss()
def show_load(self):
content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load file", content=content,
size_hint=(0.9, 0.9))
self._popup.open()
def show_save(self):
content = SaveDialog(save=self.save, cancel=self.dismiss_popup)
self._popup = Popup(title="Save file", 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()
def save(self, path, filename):
with open(os.path.join(path, filename), 'w') as stream:
stream.write(self.text_input.text)
self.dismiss_popup()
class MyApp(App):
def build(self):
return Root()
if __name__ == '__main__':
MyApp().run()
kv file - my.kv
#:kivy 1.11.0
<Root>:
text_input: text_input
BoxLayout:
orientation: 'vertical'
BoxLayout:
size_hint_y: None
height: 30
Button:
text: 'Load'
on_release: root.show_load()
Button:
text: 'Save'
on_release: root.show_save()
BoxLayout:
TextInput:
id: text_input
text: ''
RstDocument:
text: text_input.text
show_errors: True
<LoadDialog>:
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserListView:
id: filechooser
BoxLayout:
size_hint_y: None
height: 30
Button:
text: "Cancel"
on_release: root.cancel()
Button:
text: "Load"
on_release: root.load(filechooser.path, filechooser.selection)
<SaveDialog>:
text_input: text_input
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserListView:
id: filechooser
on_selection: text_input.text = self.selection and self.selection[0] or ''
TextInput:
id: text_input
size_hint_y: None
height: 30
multiline: False
BoxLayout:
size_hint_y: None
height: 30
Button:
text: "Cancel"
on_release: root.cancel()
Button:
text: "Save"
on_release: root.save(filechooser.path, text_input.text)
Output