154 lines
4.0 KiB
Python
154 lines
4.0 KiB
Python
"""Eventloop hook for OS X
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Calls NSApp / CoreFoundation APIs via ctypes.
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"""
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# cribbed heavily from IPython.terminal.pt_inputhooks.osx
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# obj-c boilerplate from appnope, used under BSD 2-clause
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import ctypes
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import ctypes.util
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from threading import Event
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objc = ctypes.cdll.LoadLibrary(ctypes.util.find_library('objc'))
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void_p = ctypes.c_void_p
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objc.objc_getClass.restype = void_p
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objc.sel_registerName.restype = void_p
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objc.objc_msgSend.restype = void_p
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objc.objc_msgSend.argtypes = [void_p, void_p]
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msg = objc.objc_msgSend
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def _utf8(s):
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"""ensure utf8 bytes"""
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if not isinstance(s, bytes):
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s = s.encode('utf8')
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return s
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def n(name):
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"""create a selector name (for ObjC methods)"""
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return objc.sel_registerName(_utf8(name))
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def C(classname):
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"""get an ObjC Class by name"""
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return objc.objc_getClass(_utf8(classname))
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# end obj-c boilerplate from appnope
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# CoreFoundation C-API calls we will use:
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CoreFoundation = ctypes.cdll.LoadLibrary(ctypes.util.find_library('CoreFoundation'))
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CFAbsoluteTimeGetCurrent = CoreFoundation.CFAbsoluteTimeGetCurrent
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CFAbsoluteTimeGetCurrent.restype = ctypes.c_double
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CFRunLoopGetCurrent = CoreFoundation.CFRunLoopGetCurrent
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CFRunLoopGetCurrent.restype = void_p
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CFRunLoopGetMain = CoreFoundation.CFRunLoopGetMain
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CFRunLoopGetMain.restype = void_p
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CFRunLoopStop = CoreFoundation.CFRunLoopStop
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CFRunLoopStop.restype = None
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CFRunLoopStop.argtypes = [void_p]
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CFRunLoopTimerCreate = CoreFoundation.CFRunLoopTimerCreate
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CFRunLoopTimerCreate.restype = void_p
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CFRunLoopTimerCreate.argtypes = [
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void_p, # allocator (NULL)
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ctypes.c_double, # fireDate
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ctypes.c_double, # interval
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ctypes.c_int, # flags (0)
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ctypes.c_int, # order (0)
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void_p, # callout
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void_p, # context
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]
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CFRunLoopAddTimer = CoreFoundation.CFRunLoopAddTimer
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CFRunLoopAddTimer.restype = None
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CFRunLoopAddTimer.argtypes = [ void_p, void_p, void_p ]
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kCFRunLoopCommonModes = void_p.in_dll(CoreFoundation, 'kCFRunLoopCommonModes')
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def _NSApp():
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"""Return the global NSApplication instance (NSApp)"""
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return msg(C('NSApplication'), n('sharedApplication'))
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def _wake(NSApp):
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"""Wake the Application"""
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event = msg(C('NSEvent'),
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n('otherEventWithType:location:modifierFlags:'
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'timestamp:windowNumber:context:subtype:data1:data2:'),
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15, # Type
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0, # location
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0, # flags
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0, # timestamp
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0, # window
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None, # context
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0, # subtype
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0, # data1
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0, # data2
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)
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msg(NSApp, n('postEvent:atStart:'), void_p(event), True)
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_triggered = Event()
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def stop(timer=None, loop=None):
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"""Callback to fire when there's input to be read"""
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_triggered.set()
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NSApp = _NSApp()
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# if NSApp is not running, stop CFRunLoop directly,
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# otherwise stop and wake NSApp
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if msg(NSApp, n('isRunning')):
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msg(NSApp, n('stop:'), NSApp)
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_wake(NSApp)
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else:
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CFRunLoopStop(CFRunLoopGetCurrent())
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_c_callback_func_type = ctypes.CFUNCTYPE(None, void_p, void_p)
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_c_stop_callback = _c_callback_func_type(stop)
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def _stop_after(delay):
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"""Register callback to stop eventloop after a delay"""
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timer = CFRunLoopTimerCreate(
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None, # allocator
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CFAbsoluteTimeGetCurrent() + delay, # fireDate
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0, # interval
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0, # flags
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0, # order
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_c_stop_callback,
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None,
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)
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CFRunLoopAddTimer(
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CFRunLoopGetMain(),
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timer,
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kCFRunLoopCommonModes,
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)
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def mainloop(duration=1):
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"""run the Cocoa eventloop for the specified duration (seconds)"""
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_triggered.clear()
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NSApp = _NSApp()
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_stop_after(duration)
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msg(NSApp, n('run'))
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if not _triggered.is_set():
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# app closed without firing callback,
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# probably due to last window being closed.
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# Run the loop manually in this case,
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# since there may be events still to process (ipython/ipython#9734)
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CoreFoundation.CFRunLoopRun()
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