# kivy_generic.py

#!/usr/bin/python

# kivy_generic.py

import kivy
kivy.require('1.9.0')
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.scatter import ScatterPlane
from kivy.uix.scatter import Scatter
from kivy.uix.label import Label
from kivy.lang import Builder


class MyScatter(Scatter):
    pass

class MyScatterPlane(ScatterPlane):
    def __init__(self, **kwargs):
        super(MyScatterPlane, self).__init__(**kwargs)
        self.keys_down = []
        self.keyboard = Window.request_keyboard(None, self)
        self.keyboard.bind(on_key_down=self.on_keyboard_down)
        self.keyboard.bind(on_key_up=self.on_keyboard_up)

    def on_keyboard_down(self, keyboard, keycode, text, modifiers):
        return self.keys_down.append(keycode[1])

    def on_keyboard_up(self, window, keycode):
        try:
            self.keys_down.remove(keycode[1])
        except KeyError as err:
            print(err)
        return True

    def on_touch_down(self, touch):
        if(touch.button == 'left'):
            return super(Scatter, self).on_touch_down(touch)          #works
        elif('shift' in self.keys_down and touch.button == 'right'):
            return super(MyScatterPlane, self).on_touch_down(touch)
        else:
            return False

    def on_touch_up(self, touch):
        return super(MyScatterPlane, self).on_touch_up(touch)

ui = Builder.load_string("""
ScreenManager:
    MainScreen:

<MainScreen@Screen>:
    MyScatterPlane:
        Label:
            pos: 100, 100
            text: 'Test'
        MyScatter:
            canvas:
                Color:
                    rgb: 0.5, 0.1, 0.1
                Rectangle:
                    size: self.size
            pos: 0, 0
            size_hint: None, None
            size: 100, 100
""")


class TestApp(App):
    def build(self):
        return ui

if __name__ == '__main__':
    TestApp().run()