[PyQt] App crashes when reopening a subwindow

[Axel_Erfurt]

The maximum size of the subwindow is the size of the mdiArea.

[JayCee]

The maximum size of the subwindow is the size of the mdiArea.

I see... That's an issue then. Is there a way to make the size of the subwindow be independent from the mdiArea though?

[Axel_Erfurt]

I think the only way for a fixed size is not to use it as mdiArea subwindow and make it ontop.

 
    def OpenUserForm(self):
        self.swu = SubWindowUsers()
        self.swu.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
        self.swu.setFixedSize(QtCore.QSize(400, 300))
        self.swu.move(QtCore.QPoint(self.geometry().x() + 2, self.geometry().y() + 30))
        #self.mdiArea.addSubWindow(self.swu)
        self.swu.setWindowTitle("Users")
        self.swu.show()
        self.statusbar.showMessage("Users Window opened", 0)

[JayCee]

I think the only way for a fixed size is not to use it as mdiArea subwindow and make it ontop.

Hi, Axel. I figured out a way of doing it. I started from scratch and kept the code to a bare minimum. I will add the other features later. Now it works exactly the way I want it:

from PyQt5.QtWidgets import QApplication, QMainWindow, QMdiArea, QAction, QMdiSubWindow, QTextEdit
import sys


class MDIWindow(QMainWindow):
    count = 0

    def __init__(self):
        super().__init__()

        self.mdi = QMdiArea()
        self.setCentralWidget(self.mdi)

        bar = self.menuBar()
        file = bar.addMenu("File")
        file.addAction("New")
        file.addAction("Cascade")
        file.addAction("Tile")

        self.setWindowTitle("MDI Application")

        file.triggered[QAction].connect(self.WindowTrig)

    def WindowTrig(self, p):

        if p.text() == "New":
            MDIWindow.count = MDIWindow.count + 1
            sub = QMdiSubWindow()
            sub.setWidget(QMainWindow())
            sub.setWindowTitle("Sub window " + str(MDIWindow.count))
            self.mdi.addSubWindow(sub)
            sub.setFixedSize(400, 300)
            sub.show()

        if p.text() == "Cascade":
            self.mdi.cascadeSubWindows()

        if p.text() == "Tile":
            self.mdi.tileSubWindows()


app = QApplication(sys.argv)
mdiwindow = MDIWindow()
mdiwindow.show()
app.exec_()

Thanks again for all your help!