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