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qt4reactor.py
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qt4reactor.py
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# Take from http://twistedmatrix.com/trac/browser/sandbox/therve/qt4reactor.py?rev=22736&format=txt
# Copyright (c) 2001-2008 Twisted Matrix Laboratories.
# See LICENSE for details.
"""
This module provides support for Twisted to interact with the PyQt mainloop.
In order to use this support, simply do the following::
| import qt4reactor
| qt4reactor.install()
Then use twisted.internet APIs as usual. The other methods here are not
intended to be called directly.
API Stability: stable
Maintainer: U{Itamar Shtull-Trauring<mailto:twisted@itamarst.org>}
Port to QT4: U{Gabe Rudy<mailto:rudy@goldenhelix.com>}
"""
__all__ = ['install']
import sys
from zope.interface import implements
from PyQt4.QtCore import QSocketNotifier, QObject, SIGNAL, QTimer
from PyQt4.QtGui import QApplication
from twisted.internet.interfaces import IReactorFDSet
from twisted.python import log
from twisted.internet.posixbase import PosixReactorBase
class TwistedSocketNotifier(QSocketNotifier):
"""
Connection between an fd event and reader/writer callbacks.
"""
def __init__(self, reactor, watcher, type):
QSocketNotifier.__init__(self, watcher.fileno(), type)
self.reactor = reactor
self.watcher = watcher
self.fn = None
if type == QSocketNotifier.Read:
self.fn = self.read
elif type == QSocketNotifier.Write:
self.fn = self.write
QObject.connect(self, SIGNAL("activated(int)"), self.fn)
def shutdown(self):
QObject.disconnect(self, SIGNAL("activated(int)"), self.fn)
self.setEnabled(0)
self.fn = self.watcher = None
def read(self, sock):
w = self.watcher
def _read():
why = None
try:
why = w.doRead()
except:
log.err()
why = sys.exc_info()[1]
if why:
self.reactor._disconnectSelectable(w, why, True)
log.callWithLogger(w, _read)
self.reactor.simulate()
def write(self, sock):
w = self.watcher
def _write():
why = None
self.setEnabled(0)
try:
why = w.doWrite()
except:
log.err()
why = sys.exc_value
if why:
self.reactor._disconnectSelectable(w, why, False)
elif self.watcher:
self.setEnabled(1)
log.callWithLogger(w, _write)
self.reactor.simulate()
class QTReactor(PosixReactorBase):
"""
Qt based reactor.
"""
implements(IReactorFDSet)
# Reference to a DelayedCall for self.crash() when the reactor is
# entered through .iterate()
_crashCall = None
_timer = None
def __init__(self, app=None):
self._reads = {}
self._writes = {}
if app is None:
app = QApplication([])
self.qApp = app
PosixReactorBase.__init__(self)
self.addSystemEventTrigger('after', 'shutdown', self.cleanup)
def addReader(self, reader):
if not reader in self._reads:
self._reads[reader] = TwistedSocketNotifier(self, reader,
QSocketNotifier.Read)
def addWriter(self, writer):
if not writer in self._writes:
self._writes[writer] = TwistedSocketNotifier(self, writer,
QSocketNotifier.Write)
def removeReader(self, reader):
if reader in self._reads:
self._reads[reader].shutdown()
del self._reads[reader]
def removeWriter(self, writer):
if writer in self._writes:
self._writes[writer].shutdown()
del self._writes[writer]
def removeAll(self):
return self._removeAll(self._reads, self._writes)
def getReaders(self):
return self._reads.keys()
def getWriters(self):
return self._writes.keys()
def simulate(self):
if self._timer is not None:
self._timer.stop()
self._timer = None
if not self.running:
self.qApp.exit()
return
self.runUntilCurrent()
if self._crashCall is not None:
self._crashCall.reset(0)
timeout = self.timeout()
if timeout is None:
timeout = 1.0
timeout = min(timeout, 0.001) * 1010
if self._timer is None:
self._timer = QTimer()
QObject.connect(self._timer, SIGNAL("timeout()"), self.simulate)
self._timer.start(timeout)
def cleanup(self):
if self._timer is not None:
self._timer.stop()
self._timer = None
def iterate(self, delay=0.0):
self._crashCall = self.callLater(delay, self._crash)
self.run()
def mainLoop(self):
self.simulate()
self.qApp.exec_()
def _crash(self):
if self._crashCall is not None:
if self._crashCall.active():
self._crashCall.cancel()
self._crashCall = None
self.running = False
def install(app=None):
"""
Configure the twisted mainloop to be run inside the qt mainloop.
"""
from twisted.internet import main
reactor = QTReactor(app=app)
main.installReactor(reactor)