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"""Enable pyglet to be used interacively with prompt_toolkit
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"""
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from __future__ import absolute_import
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import os
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import sys
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import time
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from timeit import default_timer as clock
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import pyglet
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# On linux only, window.flip() has a bug that causes an AttributeError on
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# window close. For details, see:
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# http://groups.google.com/group/pyglet-users/browse_thread/thread/47c1aab9aa4a3d23/c22f9e819826799e?#c22f9e819826799e
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if sys.platform.startswith('linux'):
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def flip(window):
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try:
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window.flip()
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except AttributeError:
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pass
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else:
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def flip(window):
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window.flip()
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def inputhook(context):
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"""Run the pyglet event loop by processing pending events only.
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This keeps processing pending events until stdin is ready. After
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processing all pending events, a call to time.sleep is inserted. This is
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needed, otherwise, CPU usage is at 100%. This sleep time should be tuned
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though for best performance.
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"""
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# We need to protect against a user pressing Control-C when IPython is
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# idle and this is running. We trap KeyboardInterrupt and pass.
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try:
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t = clock()
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while not context.input_is_ready():
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pyglet.clock.tick()
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for window in pyglet.app.windows:
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window.switch_to()
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window.dispatch_events()
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window.dispatch_event('on_draw')
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flip(window)
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# We need to sleep at this point to keep the idle CPU load
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# low. However, if sleep to long, GUI response is poor. As
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# a compromise, we watch how often GUI events are being processed
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# and switch between a short and long sleep time. Here are some
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# stats useful in helping to tune this.
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# time CPU load
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# 0.001 13%
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# 0.005 3%
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# 0.01 1.5%
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# 0.05 0.5%
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used_time = clock() - t
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if used_time > 10.0:
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# print 'Sleep for 1 s' # dbg
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time.sleep(1.0)
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elif used_time > 0.1:
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# Few GUI events coming in, so we can sleep longer
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# print 'Sleep for 0.05 s' # dbg
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time.sleep(0.05)
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else:
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# Many GUI events coming in, so sleep only very little
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time.sleep(0.001)
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except KeyboardInterrupt:
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pass
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