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# -*- coding: utf-8 -*-
'''
Container Example
==============
This example shows how to add a container to our screen.
A container is simply an empty place on the screen which
could be filled with any other content from a .kv file.
'''
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
import kivy
kivy.require('1.8.0')
class RootWidget(BoxLayout):
'''Create a controller that receives a custom widget from the kv lang file.
Add an action to be called from a kv file.
'''
container = ObjectProperty(None)
class EzsApp(App):
'''This is the app itself'''
def build(self):
'''This method loads the root.kv file automatically
:rtype: none
'''
# loading the content of root.kv
self.root = Builder.load_file('kv/root.kv')
def next_screen(self, screen):
'''Clear container and load the given screen object from file in kv
folder.
:param screen: name of the screen object made from the loaded .kv file
:type screen: str
:rtype: none
'''
filename = screen + '.kv'
# unload the content of the .kv file
# reason: it could have data from previous calls
Builder.unload_file('kv/' + filename)
# clear the container
self.root.container.clear_widgets()
# load the content of the .kv file
screen = Builder.load_file('kv/' + filename)
# add the content of the .kv file to the container
self.root.container.add_widget(screen)
if __name__ == '__main__':
'''Start the application'''
EzsApp().run()
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