from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys

from ctypes import pythonapi, c_void_p, py_object, windll, cast
from functools import partial
import time


class MainWindow(QWidget):
    def __init__(self, parent=None, *args):
        super(MainWindow, self).__init__()

        the2 = ['sfas', 'vdavas', 'dasf', 'tqtw', 'fdgagd']
        the = ['sfafas', 'favv', 'v', 'sacv', 'avasv']

        cmbBox = QComboBox()
        cmbBox2 = QComboBox()
        showbtn = QPushButton('open popup')

        cmbBox.insertItems(0, the)
        cmbBox2.insertItems(0, the2)

        layout = QVBoxLayout()
        layout.addWidget(cmbBox)
        layout.addWidget(cmbBox2)
        layout.addWidget(showbtn)
        self.setLayout(layout)

        self.setWindowFlags(Qt.WindowStaysOnTopHint)

        showbtn.clicked.connect(partial(self.showCmbBoxPopup, cmbBox2))


    def showCmbBoxPopup(self, cmbbox):
            cmbbox.showPopup()


class MyWorkerThread(QThread):
    def __init__(self, app):
        super(MyWorkerThread, self).__init__(app)

        self.app = app

    def run(self):
        self.timer= QTimer()
        print self.timer.thread()
        # self.timer.setSingleShot(False)
        self.timer.timeout.connect(self.doWork)
        self.timer.start(3000)
        self.exec_()

    def doWork(self):
        print "Work!"
        # this method runs once every length of the interval defined.

        for widget in self.app.topLevelWidgets():
            comboboxes = widget.findChildren(QComboBox)
            # print comboboxes

            if not widget.isVisible():

                widget.show()

                for cmbbox in comboboxes:
                    cmbbox.showPopup()
                    cmbbox.hidePopup()
            else:
                widget.hide()
                for cmbbox in comboboxes:
                    cmbbox.showPopup()
                    cmbbox.hidePopup()



def main():
    app = QApplication(sys.argv)

    a = MyWorkerThread(app)
    a.start()

    w = MainWindow()
    w.show()

    app.exec_()


if __name__ == "__main__":
    main()