unfreezing GUI

[singhai.nish]

Is it true that to unfreeze a GUI one should use qthread whlie working in a pyqt framework ?

If that is true then when a user clicks "OK" control should go to another thread passing a def from GUI. ( in the script attached )

and ok button change to "processing"

Googling for qthreads has helped build code to this level. However, my code does not work as required.

I have tried two ways. One is while the GUI freezes to display "processing " on ok button so that user knows something is going on.

Best would be to pass the task that takes time to another thread. None work .

Kindly suggest what I am missing.

#!/usr/bin/env python
import sys
import os, time
from PyQt4 import QtCore, QtGui
from backUpUi import Ui_MainWindow
 
class setText01Thread(QtCore.QThread):
 
    def __init__(self, mw):
        super(setText01Thread, self).__init__(mw)
 
    def run(self):
        self.emit(QtCore.SIGNAL('setStatus'))
 
class backUpMain(QtGui.QMainWindow):
 
    """UI functionality to pack stuff for client"""
    def __init__(self,parent=None):
        super(backUpMain, self).__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
 
        self.connect(self.ui.okButton, QtCore.SIGNAL("clicked()"), self._handlebackUp)
        self.ui.cancelButton.released.connect(self.close)
        self.statusTh = setText01Thread(self)
        self.connect(self.statusTh, QtCore.SIGNAL('setStatus'), self.updateText_01,QtCore.Qt.QueuedConnection)
 
    def updateText_01(self):
        self.ui.okButton.setText("Processing Started")
 
    def _handlebackUp(self):
 
        self.statusTh.start()
        self.ui.logEdit.clear()
        .
        .
        outPutFileName = self.ui.outEdit.text()
        inputData = self.getInputContent(self.ui.filePathEdit.text())
 
#        indPath = self.getIndPathFromShotgun(projectId,"sg_ind_path_to_frames")
# the above line takes a long time to execute. Can this def be executed in another
# thread 
        .
        .
        .
 
def main():
    app = QtGui.QApplication(sys.argv)
    dialog = backUpMain()
    dialog.show()
    sys.exit(app.exec_())
 
if __name__ == '__main__':
    main()

#!/usr/bin/env python
import sys
import os, time
from PyQt4 import QtCore, QtGui
from backUpUi import Ui_MainWindow

class setText01Thread(QtCore.QThread):

    def __init__(self, mw):
        super(setText01Thread, self).__init__(mw)

    def run(self):
        self.emit(QtCore.SIGNAL('setStatus'))

class backUpMain(QtGui.QMainWindow):

    """UI functionality to pack stuff for client"""
    def __init__(self,parent=None):
        super(backUpMain, self).__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        self.connect(self.ui.okButton, QtCore.SIGNAL("clicked()"), self._handlebackUp)
        self.ui.cancelButton.released.connect(self.close)
        self.statusTh = setText01Thread(self)
        self.connect(self.statusTh, QtCore.SIGNAL('setStatus'), self.updateText_01,QtCore.Qt.QueuedConnection)

    def updateText_01(self):
        self.ui.okButton.setText("Processing Started")

    def _handlebackUp(self):

        self.statusTh.start()
        self.ui.logEdit.clear()
        .
        .
        outPutFileName = self.ui.outEdit.text()
        inputData = self.getInputContent(self.ui.filePathEdit.text())

#        indPath = self.getIndPathFromShotgun(projectId,"sg_ind_path_to_frames")
# the above line takes a long time to execute. Can this def be executed in another
# thread 
        .
        .
        .

def main():
    app = QtGui.QApplication(sys.argv)
    dialog = backUpMain()
    dialog.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

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