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kivy_venv/share/kivy-examples/container/kv/1.kv

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+#:kivy 1.8.0
+#:import datetime datetime
+
+RootWidget:
+    # import container
+    container: container
+
+    # fill the container
+    BoxLayout:
+        id: container
+        orientation: 'vertical'
+        padding: 0
+        spacing: 3
+
+        Label:
+            text: 'screen-1'
+
+        BoxLayout:
+            orientation: 'horizontal'
+            padding: 0
+            spacing: 1
+            size_hint: 1, 0.1
+
+            # weiter button
+            Button:
+                size_hint: 0.2, 1
+                text: 'next'
+                on_release: app.next_screen('2')

kivy_venv/share/kivy-examples/container/kv/2.kv

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+#:kivy 1.8.0
+#:import datetime datetime
+
+RootWidget:
+    # import container
+    container: container
+
+    # fill the container
+    BoxLayout:
+        id: container
+        orientation: 'vertical'
+        padding: 0
+        spacing: 3
+
+        Label:
+            text: 'screen-2'
+
+        BoxLayout:
+            orientation: 'horizontal'
+            padding: 0
+            spacing: 1
+            size_hint: 1, 0.1
+
+            # weiter button
+            Button:
+                size_hint: 0.2, 1
+                text: 'next'
+                on_release: app.next_screen('3')

kivy_venv/share/kivy-examples/container/kv/3.kv

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+#:kivy 1.8.0
+#:import datetime datetime
+
+RootWidget:
+    # import container
+    container: container
+
+    # fill the container
+    BoxLayout:
+        id: container
+        orientation: 'vertical'
+        padding: 0
+        spacing: 3
+
+        Label:
+            text: 'screen-3'
+
+        BoxLayout:
+            orientation: 'horizontal'
+            padding: 0
+            spacing: 1
+            size_hint: 1, 0.1
+
+            # weiter button
+            Button:
+                size_hint: 0.2, 1
+                text: 'next'
+                on_release: app.next_screen('1')

kivy_venv/share/kivy-examples/container/kv/root.kv

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+#:kivy 1.8.0
+
+RootWidget:
+    # import container
+    container: container
+
+    BoxLayout:
+        orientation: 'vertical'
+        padding: 0
+        spacing: 6
+
+        # bottom-left part:
+        BoxLayout:
+            orientation: 'horizontal'
+            padding: 0
+            spacing: 6
+
+            # bottom-left
+            BoxLayout:
+                size_hint: 0.12, 0.12
+                orientation: 'vertical'
+                padding: 0
+                spacing: 6
+
+                # option calibrate
+                Button:
+                    text: 'Start'
+                    on_release: app.next_screen('1')
+
+            # create container (bottom-right)
+            BoxLayout:
+                id: container

kivy_venv/share/kivy-examples/container/main.py

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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()