| # encoding: utf-8 |
| |
| """ |
| Enable wxPython to be used interacive by setting PyOS_InputHook. |
| |
| Authors: Robin Dunn, Brian Granger, Ondrej Certik |
| """ |
| |
| #----------------------------------------------------------------------------- |
| # Copyright (C) 2008-2011 The IPython Development Team |
| # |
| # Distributed under the terms of the BSD License. The full license is in |
| # the file COPYING, distributed as part of this software. |
| #----------------------------------------------------------------------------- |
| |
| #----------------------------------------------------------------------------- |
| # Imports |
| #----------------------------------------------------------------------------- |
| |
| import sys |
| import signal |
| from _pydev_imps import _pydev_time as time |
| from timeit import default_timer as clock |
| import wx |
| |
| from pydev_ipython.inputhook import stdin_ready |
| |
| |
| #----------------------------------------------------------------------------- |
| # Code |
| #----------------------------------------------------------------------------- |
| |
| def inputhook_wx1(): |
| """Run the wx event loop by processing pending events only. |
| |
| This approach seems to work, but its performance is not great as it |
| relies on having PyOS_InputHook called regularly. |
| """ |
| try: |
| app = wx.GetApp() |
| if app is not None: |
| assert wx.Thread_IsMain() |
| |
| # Make a temporary event loop and process system events until |
| # there are no more waiting, then allow idle events (which |
| # will also deal with pending or posted wx events.) |
| evtloop = wx.EventLoop() |
| ea = wx.EventLoopActivator(evtloop) |
| while evtloop.Pending(): |
| evtloop.Dispatch() |
| app.ProcessIdle() |
| del ea |
| except KeyboardInterrupt: |
| pass |
| return 0 |
| |
| class EventLoopTimer(wx.Timer): |
| |
| def __init__(self, func): |
| self.func = func |
| wx.Timer.__init__(self) |
| |
| def Notify(self): |
| self.func() |
| |
| class EventLoopRunner(object): |
| |
| def Run(self, time): |
| self.evtloop = wx.EventLoop() |
| self.timer = EventLoopTimer(self.check_stdin) |
| self.timer.Start(time) |
| self.evtloop.Run() |
| |
| def check_stdin(self): |
| if stdin_ready(): |
| self.timer.Stop() |
| self.evtloop.Exit() |
| |
| def inputhook_wx2(): |
| """Run the wx event loop, polling for stdin. |
| |
| This version runs the wx eventloop for an undetermined amount of time, |
| during which it periodically checks to see if anything is ready on |
| stdin. If anything is ready on stdin, the event loop exits. |
| |
| The argument to elr.Run controls how often the event loop looks at stdin. |
| This determines the responsiveness at the keyboard. A setting of 1000 |
| enables a user to type at most 1 char per second. I have found that a |
| setting of 10 gives good keyboard response. We can shorten it further, |
| but eventually performance would suffer from calling select/kbhit too |
| often. |
| """ |
| try: |
| app = wx.GetApp() |
| if app is not None: |
| assert wx.Thread_IsMain() |
| elr = EventLoopRunner() |
| # As this time is made shorter, keyboard response improves, but idle |
| # CPU load goes up. 10 ms seems like a good compromise. |
| elr.Run(time=10) # CHANGE time here to control polling interval |
| except KeyboardInterrupt: |
| pass |
| return 0 |
| |
| def inputhook_wx3(): |
| """Run the wx event loop by processing pending events only. |
| |
| This is like inputhook_wx1, but it 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: |
| app = wx.GetApp() |
| if app is not None: |
| assert wx.Thread_IsMain() |
| |
| # The import of wx on Linux sets the handler for signal.SIGINT |
| # to 0. This is a bug in wx or gtk. We fix by just setting it |
| # back to the Python default. |
| if not callable(signal.getsignal(signal.SIGINT)): |
| signal.signal(signal.SIGINT, signal.default_int_handler) |
| |
| evtloop = wx.EventLoop() |
| ea = wx.EventLoopActivator(evtloop) |
| t = clock() |
| while not stdin_ready(): |
| while evtloop.Pending(): |
| t = clock() |
| evtloop.Dispatch() |
| app.ProcessIdle() |
| # 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) |
| del ea |
| except KeyboardInterrupt: |
| pass |
| return 0 |
| |
| if sys.platform == 'darwin': |
| # On OSX, evtloop.Pending() always returns True, regardless of there being |
| # any events pending. As such we can't use implementations 1 or 3 of the |
| # inputhook as those depend on a pending/dispatch loop. |
| inputhook_wx = inputhook_wx2 |
| else: |
| # This is our default implementation |
| inputhook_wx = inputhook_wx3 |