PyQt5 .ui file not loading when run along with big process

Python
1

i have a big project, but for simplicity reasons, i will show you the part of my application that end up in the “error”

So i have my MainScreen class that is responsible for opening the main screen of the application and handling a couple of other functionalities.

then inside my MainScreen class i have a method(function1) that opens a dialog by calling another class(OpenDialog).

class MainScreen(QtWidgets.QMainWindow):
    
    ...................
    # do stuff


    def function1(self):
        dialog2 = OpenDialog(self, self.parameter)
        dialog2.exec()
        # do more stuff

Then i have my OpenDialog class which opens another screen and after it opens it, it must call some other function(test ) that does some calculation that take alot of time.

class OpenDialog(QtWidgets.QDialog):

    def __init__(self, parent, parameter):
        super().__init__(parent)
        self.parameter = parameter
        uic.loadUi('interface/dialog.ui', self)
        test()

        self.pushButton.clicked.connect(self.test)
   



    def test(self):
        # do alot of stuff that take time

The problem is on the OpenDialog class, that if the test method is called on a button click(by removing the commenting line). First the dialog opens and then the calculations on the test are performed normally. But if i remove the button(because i dont want it) and i call the test method after the dialog loads, then the test methods is run and it performs all the calculations, but the dialog never opens.

2

Hi, I did have worked with PyQt 5 but I don’t know the exact answer you are looking for, but can give you a way. When I was working on PyQt, the major issue I faced is to constantly update values in the user interface which in one or other way will freeze the User Interface. Using Qthread concept can actually have a solution. I think you might have got a route to pave your path.

3

thats actually another problem i have.
Do you have any idea on how to put qthreads to this example?

4

Drop your Mail ID: I will drop my code.

5

or you can clone it here: GitHub - VishalBaskhi/UserInterface_PyQt5: This UI mainly deals with monitoring the robots motion, velocities, battery life, to start, kill, & save map in to a folder.

1 Like
6

can you please help me with using qthreads in the above example? How exactly can i call the test function on a qthread?

7

you basically emit the data according to the data type you need … For instance Qthread works like a pipeline …doing all the necessary stuff in other class and gives the particular output. once go to Qthread library page in PyQt5

8

Okay, im new to this things (QThreads and signals) so im probably doing something wrong.
so i set up the below code, where after the button in the dialog is pressed i need to run a function that takes alot of time, so i tried to set up a thread with a signal, but my function(bigTask) that runs all the stuff that take alot of time, is not run. Do you know how i can fix that?

class OpenDialog(QtWidgets.QDialog):

    def __init__(self, parent, parameter):
        super().__init__(parent)
        self.parameter = parameter
        uic.loadUi('interface/dialog.ui', self)

        self.pushButton.clicked.connect(self.init)



    def init(self):
        self.worker = WorkerObject()
        self.worker_thread = QtCore.QThread()
        self.worker.moveToThread(self.worker_thread)
        self.worker_thread.start()

        self.worker.runTask.emit()
        self.worker.runTask.connect(self.worker.bigTask)

class WorkerObject(QtCore.QObject):
    runTask = pyqtSignal()

    def bigTask(self):
          # does alot of stuff that take time
9

is class workerObject(QtCore.Qobject) is the class that u wanted to run ur function ??

1 Like
10

well ideally i would want to have this function inside the OpenDialog class, but in most examples that i saw they used a separate class.

11

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