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# @see https://copyprogramming.com/howto/qtsingleapplication-for-pyside-or-pyqt | ||
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import sys | ||
from PyQt5.QtCore import * | ||
from PyQt5.QtGui import * | ||
from PyQt5.QtNetwork import * | ||
from PyQt5.QtWidgets import (QApplication, QMainWindow, QTableView, | ||
QWidget, QVBoxLayout, QLabel, QHeaderView) | ||
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class QtSingleApplication(QApplication): | ||
messageReceived = pyqtSignal() | ||
def __init__(self, id, *argv): | ||
super(QtSingleApplication, self).__init__(*argv) | ||
self._id = id | ||
self._activationWindow = None | ||
self._activateOnMessage = False | ||
# Is there another instance running? | ||
self._outSocket = QLocalSocket() | ||
self._outSocket.connectToServer(self._id) | ||
self._isRunning = self._outSocket.waitForConnected() | ||
if self._isRunning: | ||
# Yes, there is. | ||
self._outStream = QTextStream(self._outSocket) | ||
self._outStream.setCodec('UTF-8') | ||
else: | ||
# No, there isn't. | ||
self._outSocket = None | ||
self._outStream = None | ||
self._inSocket = None | ||
self._inStream = None | ||
self._server = QLocalServer() | ||
self._server.listen(self._id) | ||
self._server.newConnection.connect(self._onNewConnection) | ||
def isRunning(self): | ||
return self._isRunning | ||
def id(self): | ||
return self._id | ||
def activationWindow(self): | ||
return self._activationWindow | ||
def setActivationWindow(self, activationWindow, activateOnMessage = True): | ||
self._activationWindow = activationWindow | ||
self._activateOnMessage = activateOnMessage | ||
def activateWindow(self): | ||
if not self._activationWindow: | ||
return | ||
self._activationWindow.setWindowState( | ||
self._activationWindow.windowState() & ~Qt.WindowMinimized) | ||
self._activationWindow.raise_() | ||
self._activationWindow.activateWindow() | ||
def sendMessage(self, msg): | ||
if not self._outStream: | ||
return False | ||
self._outStream << msg << '\n' | ||
self._outStream.flush() | ||
return self._outSocket.waitForBytesWritten() | ||
def _onNewConnection(self): | ||
if self._inSocket: | ||
self._inSocket.readyRead.disconnect(self._onReadyRead) | ||
self._inSocket = self._server.nextPendingConnection() | ||
if not self._inSocket: | ||
return | ||
self._inStream = QTextStream(self._inSocket) | ||
self._inStream.setCodec('UTF-8') | ||
self._inSocket.readyRead.connect(self._onReadyRead) | ||
if self._activateOnMessage: | ||
self.activateWindow() | ||
def _onReadyRead(self): | ||
while True: | ||
msg = self._inStream.readLine() | ||
if not msg: break | ||
self.messageReceived.emit(msg) | ||
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