gistfile1.py

# Copyright (c) 2010 Florian Mayer <flormayer (at) aim (dot) com>

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import sys
import time
import threading

from PyQt4 import QtGui, QtCore

def blocking(runinmain, parent):
    time.sleep(2)
    runinmain(
        parent.inp.setText, ("Hello World", ), {}
    )
    

class QTestWindow(QtGui.QMainWindow):
    def __init__(self, crunner):
        QtGui.QMainWindow.__init__(self)
        main = QtGui.QVBoxLayout()
        self.inp = QtGui.QTextEdit(self)
        main.addWidget(self.inp)
        
        threading.Thread(
            target=blocking, args=(crunner.runInMainThread, self)
            ).start()


class CodeRunner(QtCore.QObject):
    def __init__(self):
        QtCore.QObject.__init__(self)
        
        self.qobj = QtCore.QObject()
        
        self.connect(
            self.qobj,
            QtCore.SIGNAL(
                'runCode(PyQt_PyObject,PyQt_PyObject,PyQt_PyObject)'
                ),
            self._runCode
        )
    
    @staticmethod
    def _runCode(fun, args, kwargs):
        fun(*args, **kwargs)
    
    def runInMainThread(self, fun, args, kwargs):
        self.qobj.emit(
            QtCore.SIGNAL('runCode(PyQt_PyObject,PyQt_PyObject,PyQt_PyObject)'),
            fun, args, kwargs
        )


if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    crunner = CodeRunner()
    win = QTestWindow(crunner)
    win.show()
    app.exec_()