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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 | |