How to reserve space for hidden QtWaitingSpinner in QGridLayout? - python-3.x

Question

I'm trying to build a QtGui application that uses the QtWaitingSpinner found here: https://github.com/z3ntu/QtWaitingSpinner. I have it in a QGridLayout. However, this means that the button next to it changes size when the spinner is unhidden and started. How do I reserve the correct amount of space for the spinner in the grid so that the button next to it stays a constant size regardless of whether the spinner is shown?
Based on this stackoverflow post How to use spacers in Qt, I suspect that the answer involves QSpacerItem. However, I can't figure out how to size the QSpacerItem based on the size the spinner will need.
Here's a minimal example of the code to show my problem:
import PyQt5.QtWidgets as QWidgets
import PyQt5.QtCore as QtCore
import PyQt5.QtGui as QtGui
from waitingspinnerwidget import QtWaitingSpinner
import sys
class Example_Window(QWidgets.QWidget):
def __init__(self):
super(QWidgets.QWidget,self).__init__()
self.initUI()
def initUI(self):
self.button=QWidgets.QPushButton("Start/Stop Spinner")
self.button.clicked.connect(self.toggle_spinner)
self.spinner = QtWaitingSpinner(self,centerOnParent=False)
self.grid = QWidgets.QGridLayout()
self.grid.addWidget(self.button,0,0)
self.grid.addWidget(self.spinner,0,1)
self.setLayout(self.grid)
self.show()
def toggle_spinner(self):
if self.spinner.isSpinning():
self.spinner.stop()
else:
self.spinner.start()
if __name__ == '__main__':
app = QWidgets.QApplication([])
main = Example_Window()
sys.exit(app.exec())

Answer 1

Try it:
import PyQt5.QtWidgets as QWidgets
import PyQt5.QtCore as QtCore
import PyQt5.QtGui as QtGui
from waitingspinnerwidget import QtWaitingSpinner
import sys
class Example_Window(QWidgets.QWidget):
def __init__(self):
super(QWidgets.QWidget,self).__init__()
self.initUI()
def initUI(self):
self.button = QWidgets.QPushButton("Start Spinner") # +
self.button.clicked.connect(self.toggle_spinner)
self.spinner = QtWaitingSpinner(self, centerOnParent=False)
self.grid = QWidgets.QGridLayout()
self.grid.addWidget(self.button, 0, 0)
# self.grid.addWidget(self.spinner,0,1) # ---
self.grid.addWidget(self.spinner, 0, 1, 1, 2) # +++ <---
self.setLayout(self.grid)
self.show()
def toggle_spinner(self):
if self.spinner.isSpinning():
self.spinner.stop()
self.button.setText("Start Spinner") # +
else:
self.spinner.start()
self.button.setText("Stop Spinner") # +
if __name__ == '__main__':
app = QWidgets.QApplication([])
main = Example_Window()
main.resize(170, 70) # +++
sys.exit(app.exec())