94 lines
2.9 KiB
Python
94 lines
2.9 KiB
Python
'''Example shows the recommended way of how to run Kivy with a trio
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event loop as just another async coroutine.
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'''
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import trio
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from kivy.app import App
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from kivy.lang.builder import Builder
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kv = '''
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BoxLayout:
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orientation: 'vertical'
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BoxLayout:
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ToggleButton:
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id: btn1
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group: 'a'
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text: 'Sleeping'
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allow_no_selection: False
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on_state: if self.state == 'down': label.status = self.text
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ToggleButton:
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id: btn2
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group: 'a'
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text: 'Swimming'
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allow_no_selection: False
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on_state: if self.state == 'down': label.status = self.text
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ToggleButton:
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id: btn3
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group: 'a'
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text: 'Reading'
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allow_no_selection: False
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state: 'down'
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on_state: if self.state == 'down': label.status = self.text
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Label:
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id: label
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status: 'Reading'
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text: 'Beach status is "{}"'.format(self.status)
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'''
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class AsyncApp(App):
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nursery = None
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def build(self):
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return Builder.load_string(kv)
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async def app_func(self):
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'''trio needs to run a function, so this is it. '''
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async with trio.open_nursery() as nursery:
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'''In trio you create a nursery, in which you schedule async
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functions to be run by the nursery simultaneously as tasks.
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This will run all two methods starting in random order
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asynchronously and then block until they are finished or canceled
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at the `with` level. '''
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self.nursery = nursery
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async def run_wrapper():
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# trio needs to be set so that it'll be used for the event loop
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await self.async_run(async_lib='trio')
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print('App done')
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nursery.cancel_scope.cancel()
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nursery.start_soon(run_wrapper)
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nursery.start_soon(self.waste_time_freely)
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async def waste_time_freely(self):
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'''This method is also run by trio and periodically prints something.
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'''
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try:
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i = 0
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while True:
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if self.root is not None:
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status = self.root.ids.label.status
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print('{} on the beach'.format(status))
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# get some sleep
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if self.root.ids.btn1.state != 'down' and i >= 2:
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i = 0
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print('Yawn, getting tired. Going to sleep')
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self.root.ids.btn1.trigger_action()
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i += 1
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await trio.sleep(2)
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except trio.Cancelled as e:
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print('Wasting time was canceled', e)
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finally:
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# when canceled, print that it finished
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print('Done wasting time')
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if __name__ == '__main__':
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trio.run(AsyncApp().app_func)
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