The following snippet fails to properly display the check-boxes I am adding to a layout in a widget that has been set on a QScrollArea.
from PyQt5 import QtCore, QtWidgets
class WidgetWithScroll(QtWidgets.QWidget):
def __init__(self):
super().__init__()
row =0
layout = QtWidgets.QGridLayout()
self.ckb_area = QtWidgets.QScrollArea()
ckb_area = QtWidgets.QWidget()
ckb_layout = QtWidgets.QVBoxLayout()
ckb_area.setLayout(ckb_layout)
# setting the scroll area widget here prevents us from adding widgets to the ckb_layout
self.ckb_area.setWidget(ckb_area)
layout.addWidget(self.ckb_area, 0, 0)
for i in range(3):
ckb = QtWidgets.QCheckBox(str(i))
ckb_layout.addWidget(ckb)
self.setLayout(layout)
if __name__ == '__main__':
app = QtWidgets.QApplication([])
w = WidgetWithScroll()
w.show()
app.exec_()
By moving the setting of the widget onto the QScrollArea to after the checkboxes have been added to the widget, the checkboxes are properly rendered:
from PyQt5 import QtCore, QtWidgets
class WidgetWithScroll(QtWidgets.QWidget):
def __init__(self):
super().__init__()
row =0
layout = QtWidgets.QGridLayout()
self.ckb_area = QtWidgets.QScrollArea()
ckb_area = QtWidgets.QWidget()
ckb_layout = QtWidgets.QVBoxLayout()
ckb_area.setLayout(ckb_layout)
layout.addWidget(self.ckb_area, 0, 0)
for i in range(3):
ckb = QtWidgets.QCheckBox(str(i))
ckb_layout.addWidget(ckb)
# this line delayed to make it work:
self.ckb_area.setWidget(ckb_area)
self.setLayout(layout)
if __name__ == '__main__':
app = QtWidgets.QApplication([])
w = WidgetWithScroll()
w.show()
app.exec_()
But I want to be able to update the widgets in the scroll area dynamically after the widget has initially been fully constructed. What am I missing?
