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from kivy.app import App
from kivy.clock import Clock
from kivy.lang import Builder
from kivy.properties import NumericProperty
from kivy.properties import ObjectProperty
from kivy.uix.boxlayout import BoxLayout
Builder.load_string('''
#:import barometer plyer.barometer
<BarometerInterface>:
barometer: barometer
orientation: 'vertical'
padding: '50dp'
spacing: '20dp'
BoxLayout:
orientation: 'horizontal'
size_hint_y: 0.3
Button:
id: button_enable
text: 'Enable'
disabled: False
on_release:
root.enable()
button_disable.disabled = not button_disable.disabled
button_enable.disabled = not button_enable.disabled
Button:
id: button_disable
text: 'Disable'
disabled: True
on_release:
root.disable()
button_disable.disabled = not button_disable.disabled
button_enable.disabled = not button_enable.disabled
Label:
text: 'Current pressure:' + str(root.pressure) + ' hPa.'
''')
class BarometerInterface(BoxLayout):
'''Root Widget.'''
barometer = ObjectProperty()
pressure = NumericProperty()
def enable(self):
self.barometer.enable()
Clock.schedule_interval(self.get_pressure, 1 / 20.)
def disable(self):
self.barometer.disable()
Clock.unschedule(self.get_pressure)
def get_pressure(self, dt):
self.pressure = self.barometer.pressure or self.pressure
class BarometerApp(App):
def build(self):
return BarometerInterface()
def on_pause(self):
return True
if __name__ == "__main__":
BarometerApp().run()
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