59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
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'''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 async_runTouchApp
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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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Button:
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id: btn
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text: 'Press me'
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BoxLayout:
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Label:
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id: label
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text: 'Button is "{}"'.format(btn.state)
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'''
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async def run_app_happily(root, nursery):
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'''This method, which runs Kivy, is run by trio as one of the coroutines.
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'''
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# trio needs to be set so that it'll be used for the event loop
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await async_runTouchApp(root, async_lib='trio') # run Kivy
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print('App done')
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# now cancel all the other tasks that may be running
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nursery.cancel_scope.cancel()
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async def waste_time_freely():
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'''This method is also run by trio and periodically prints something.'''
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try:
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while True:
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print('Sitting on the beach')
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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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async def root_func():
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'''trio needs to run a function, so this is it. '''
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root = Builder.load_string(kv) # root widget
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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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nursery.start_soon(run_app_happily, root, nursery)
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nursery.start_soon(waste_time_freely)
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trio.run(root_func)
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