129 lines
4.9 KiB
Python
129 lines
4.9 KiB
Python
#!/usr/bin/env python
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#############################################################################
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##
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## Copyright (C) 2018 Riverbank Computing Limited
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## Copyright (C) 2017 Ford Motor Company
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##
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## This file is part of the PyQt examples.
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##
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## $QT_BEGIN_LICENSE:BSD$
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## Commercial License Usage
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## Licensees holding valid commercial Qt licenses may use this file in
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## accordance with the commercial license agreement provided with the
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## Software or, alternatively, in accordance with the terms contained in
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## a written agreement between you and The Qt Company. For licensing terms
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## and conditions see https://www.qt.io/terms-conditions. For further
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## information use the contact form at https://www.qt.io/contact-us.
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##
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## BSD License Usage
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## Alternatively, you may use this file under the terms of the BSD license
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## as follows:
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##
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## "Redistribution and use in source and binary forms, with or without
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## modification, are permitted provided that the following conditions are
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## met:
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## * Redistributions of source code must retain the above copyright
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## notice, this list of conditions and the following disclaimer.
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## * Redistributions in binary form must reproduce the above copyright
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## notice, this list of conditions and the following disclaimer in
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## the documentation and/or other materials provided with the
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## distribution.
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## * Neither the name of The Qt Company Ltd nor the names of its
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## contributors may be used to endorse or promote products derived
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## from this software without specific prior written permission.
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##
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##
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## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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## $QT_END_LICENSE$
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##
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#############################################################################
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import sys
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from PyQt5.QtCore import (pyqtProperty, pyqtSignal, pyqtSlot, QCoreApplication,
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QObject, QTimer, QUrl)
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from PyQt5.QtRemoteObjects import QRemoteObjectHost
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class SimpleSwitch(QObject):
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def __init__(self, parent=None):
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super().__init__(parent)
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self._currState = False
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self._stateChangeTimer = QTimer(self)
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self._stateChangeTimer.timeout.connect(self._timeout)
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self._stateChangeTimer.start(2000)
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print("Source node started")
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# PyQt does not support the use of static source types defined in .rep
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# files. However we can manually specify a dynamic type that matches a
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# .rep defined type by defining properties, signals and slots in the same
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# order. We also have to account for any internals also generated by the
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# .rep generator. At the moment this only includes an extra 'push' slot
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# for each property (that never seems to get called). This allows this
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# example to act as a server for Qt's C++ 'directconnectclient' example.
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# It is not necessary when using with clients that use dynamic source types
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# (written using either C++ or Python).
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@pyqtSlot()
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def pushCurrState(self, currState):
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pass
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def _get_currState(self):
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return self._currState
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def _set_currState(self, value):
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# If the value has changed then update it and emit the notify signal.
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if self._currState != value:
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self._currState = value
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self.currStateChanged.emit(value)
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# The property's notify signal.
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currStateChanged = pyqtSignal(bool)
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# The property exposed to a remote client.
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currState = pyqtProperty(bool, fget=_get_currState, fset=_set_currState,
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notify=currStateChanged)
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# The slot exposed to a remote client.
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@pyqtSlot(bool)
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def server_slot(self, clientState):
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# The switch state echoed back by the client.
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print("Replica state is", clientState)
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def _timeout(self):
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# Note that we don't decorate this callable so that it doesn't get
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# exposed in a replica.
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self.currState = not self.currState
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print("Source state is", self.currState)
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if __name__ == '__main__':
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app = QCoreApplication(sys.argv)
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# Create the simple switch.
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srcSwitch = SimpleSwitch()
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# Create the host object node.
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srcNode = QRemoteObjectHost(QUrl('local:replica'))
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# Enable remoting.
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srcNode.enableRemoting(srcSwitch, 'SimpleSwitch')
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sys.exit(app.exec_())
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