Merge pull request kivy#3154 from picibucor/picibucor

examples added

examples/kv/ids/id_in_kv/id_in_kv.py

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+'''
+The use of id in .kv
+==================================
+
+This small example shows how to refer from one widget
+on an other widget within .kv
+'''
+from kivy.app import App
+
+import kivy
+kivy.require('1.8.0')
+
+
+class TestApp(App):
+    pass
+
+if __name__ == '__main__':
+    TestApp().run()

examples/kv/ids/id_in_kv/test.kv

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+#:kivy 1.8.0
+
+BoxLayout:
+	orientation: 'vertical'
+	TextInput:
+		# setting the id of the widget
+		id: my_id
+		text: 'The text of the label is set within kivy'
+	Label:
+		# showing the text of the textinput by referring on the id
+		text: my_id.text

examples/kv/ids/kv_and_py/kv_and_py.py

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+'''
+ Referring on ids from .py
+==================================
+
+This example shows how to refer to an id from a .py file.
+'''
+from kivy.app import App
+from kivy.uix.boxlayout import BoxLayout
+
+import kivy
+kivy.require('1.8.0')
+
+
+class RootWidget(BoxLayout):
+
+    def first_function(self, status):
+        # print out the given parameter
+        print(status)
+        # check the status of the switch by referring on the id
+        if self.ids.my_switch.active is True:
+            # set the text of the label by referring on the id
+            self.ids.my_label.text = 'Switch is ON'
+        else:
+            # set the text of the label by referring on the id
+            self.ids.my_label.text = 'Switch is OFF'
+
+
+class TestApp(App):
+    pass
+
+
+if __name__ == '__main__':
+    TestApp().run()

examples/kv/ids/kv_and_py/test.kv

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+#:kivy 1.0
+
+RootWidget:
+	BoxLayout:
+		orientation: 'vertical'
+		Switch:
+			id: my_switch
+			on_active: root.first_function(self.active)
+
+		Label:
+			id: my_label
+			text: 'This text will be changed by the python file'