How do I open another window?

Mikeeeeee

Hi!
How do I open another window?
It is main window:

class MainWindow(QObject): 
    def __init__(self):  
        super(MainWindow, self).__init__()
        self.ui = uic.loadUi("mainWindow.ui")

It is start main window:

if __name__ == '__main__':

    app = QgsApplication([], True)
    app.initQgis()
    app.setPkgDataPath("./share/qgis")
    # print(app.srsDatabaseFilePath())
    mainWindow = MainWindow()
    mainWindow.showWindow()
    app.exec()

it is second window:

class Polygons(QObject): 
    def __init__(self):
        super(Polygons, self).__init__()
        self.ui = uic.loadUi("polygons.ui")

If I do this, then window not chowing:

        polygons = Polygons()
        polygons.showWindow()

jsulm

@Mikeeeeee said in How do I open another window?:

If I do this, then window not chowing:
polygons = Polygons()
polygons.showWindow()

It should be

polygons.show()

Polygons needs to be derived from QWidget. QObject is not visual!
But, where is this code actually located?

Mikeeeeee

I do this

class Polygons(QtWidgets.QWidget):

and this

        polygons = Polygons()
        # polygons.showWindow()
        polygons.show()

but the window never appeared. When I click the button, I try to open a new window. What else needs to be fixed?

jsulm

@Mikeeeeee said in How do I open another window?:

What else needs to be fixed?

I guess your polygons is a LOCAL variable which is destroyed as soon as it leaves its scope.
Make it member:

self._polygons = Polygons()
self._polygons.show()

[edit: added missing self SGaist]