Qt pass focus between windows - python-3.x

Question

In the following example I have a Qt button which opens a pop-out window. However, the pop-out window takes the focus entirely. Is it possible to modify this such that I can still interact with the main window by moving the mouse over it, e.g. to change the value of QDoubleSpinBox even when the pop-out window is open? I think I may need to use the QtHoverEvent class put I can't find a good example of how to do this.
import sys
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout, QGridLayout, QDoubleSpinBox,\
QLabel
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
btn = QPushButton('Button', self)
btn.move(50, 50)
btn2 = QDoubleSpinBox(self)
btn2.move(50,100)
self.sideWindowTest = sideWindowTest(self)
btn.clicked.connect(lambda: self.sideWindowTest.setupWindow())
self.setGeometry(300, 300, 300, 220)
self.setWindowTitle('Main')
self.show()
class sideWindowTest(object):
myWdg = None
def __init__(self, parent):
super().__init__()
self.viewer = parent
def initiateMenuBar(self):
self.myWdg.setWindowTitle('Phasing')
self.myWdg.setWindowModality(Qt.ApplicationModal)
MenuBar = QVBoxLayout()
self.labels = {
'phase 0': QLabel('Phase 0', self.myWdg),
}
self.inputs = {
'phase 0': QDoubleSpinBox(self.myWdg),
}
for i in self.inputs.values():
i.installEventFilter(self.myWdg)
self.inputs['phase 0'].setValue(0)
MenuBar.addWidget(self.labels['phase 0'])
MenuBar.addWidget(self.inputs['phase 0'])
MenuBar.addStretch(1)
return MenuBar
def setupWindow(self):
if not self.myWdg:
self.myWdg = QWidget()
MenuBar = self.initiateMenuBar()
grid = QGridLayout()
grid.setSpacing(10)
grid.addLayout(MenuBar, 0, 0, 1, 2)
self.myWdg.setLayout(grid)
self.myWdg.setGeometry(0, 0, 400, 100)
self.myWdg.show()
self.myWdg.activateWindow()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())

Answer 1

Yes, but you have to explicitly wrap your QWidget's in a QDialog or a QMainWindow. By default, if you create a orphan QWidget (as you are doing), Qt will wrap it in a QDialog.
Just change your class type to QDialog. Also, you should probably pass in the initial main window as the parent.
btn.clicked.connect(lambda: self.sideWindowTest.setupWindow(self))
...
def setupWindow(self, parent=None):
if not self.myWdg:
self.myWdg = QDialog(parent)