I modified an example of 3dsmax to replicate my problem.
I can’t figure out how remove a widget, actually, the instance is removed but the window display the widget
simply running the code and clicking on the button will display the problem
'''
Demonstrates how to create a QWidget with PySide2 and attach it to the 3dsmax main window.
'''
from PySide2 import QtCore
from PySide2 import QtWidgets
import MaxPlus
import pymxs
def make_cylinder():
cyl = pymxs.runtime.Cylinder(radius=10, height=30)
pymxs.runtime.redrawViews()
return
class PyMaxDialog(QtWidgets.QDialog):
def __init__(self, parent=MaxPlus.GetQMaxMainWindow()):
super(PyMaxDialog, self).__init__(parent)
self.setWindowTitle('Pyside Qt Window')
self.initUI()
def initUI(self):
self.main_layout = QtWidgets.QVBoxLayout()
self.label = QtWidgets.QLabel("Click button to create a cylinder in the scene")
self.main_layout.addWidget(self.label)
cylinder_btn = QtWidgets.QPushButton("Cylinder")
cylinder_btn.clicked.connect(self.remove_text)
self.main_layout.addWidget(cylinder_btn)
self.setLayout(self.main_layout)
self.resize(250, 100)
def remove_text(self):
self.main_layout.removeWidget(self.label)
self.main_layout.update()
time = MaxPlus.Core.GetCurrentTime()
MaxPlus.ViewportManager.RedrawViews(time)
def main():
#MaxPlus.FileManager.Reset(True)
w = PyMaxDialog()
w.show()
if __name__ == '__main__':
main()
Do you know why?
It is basic stuff, but today is not my day
Thanks
Hello again 
As your are importing pyside2 it is > 2017 so you can use pymxs.
So to redraw you only need to use:
pymxs.runtime.RedrawViews()
And to attach to the max window:
MaxPlus.AttachQWidgetToMax(self) instead of setting the parent widget in a traditional at way ( in the super._ init _ )
Adding:
@QtCore.Slot()
above remove_text is an optimisation.
And lastly you shouldn’t need to use:
main_ui.update()
These are all nit-picky and non critical though. So unfortunately, other than that I don’t understand your problem. Nothing in your code that I can see should be an issue.
Depending on your version of max you might have an obscure bug. What error message prints in the listener ( press f11 )
I cleaned up a little bit the code, it was messy.
This sample is intended to display the problem
import pymxs
from PySide2 import QtCore
from PySide2 import QtWidgets
import MaxPlus
class PyMaxDialog(QtWidgets.QDialog):
def __init__(self, parent=MaxPlus.GetQMaxMainWindow()):
super(PyMaxDialog, self).__init__(parent)
self.setWindowTitle('Pyside Qt Window')
self.initUI()
def initUI(self):
self.main_layout = QtWidgets.QVBoxLayout()
self.label = QtWidgets.QLabel("Click button delete this text")
self.main_layout.addWidget(self.label)
delete_btn = QtWidgets.QPushButton("Delete")
delete_btn.clicked.connect(self.remove_text)
self.main_layout.addWidget(delete_btn)
self.setLayout(self.main_layout)
self.resize(250, 100)
@QtCore.Slot()
def remove_text(self):
self.main_layout.removeWidget(self.label)
pymxs.runtime.RedrawViews()
def main():
w = PyMaxDialog()
w.show()
if __name__ == '__main__':
main()
This is what I have before and after clicking the button.
Is this a bug?
I tested this only on max 2019
Thanks for your support
Yeah that definitely looks to be a bug. I don’t have access to 2019 as I am not at work but you could try the following as a work around:
self.label.setMaximumHeight(0)
Or:
self.label.hide()
That way you can hide the label and keep it in your layout to be reused later.
1 Like
I will test on another max version asap to give some information to Autodesk about the bug
This combo actually removed the widget, thanks for the suggestion
I leave it here for someone else:
import pymxs
from PySide2 import QtCore
from PySide2 import QtWidgets
import MaxPlus
class PyMaxDialog(QtWidgets.QDialog):
def __init__(self, parent=MaxPlus.GetQMaxMainWindow()):
super(PyMaxDialog, self).__init__(parent)
self.setWindowTitle('Pyside Qt Window')
self.initUI()
def initUI(self):
self.main_layout = QtWidgets.QVBoxLayout()
self.label = QtWidgets.QLabel("Click button delete this text")
self.main_layout.addWidget(self.label)
delete_btn = QtWidgets.QPushButton("Delete")
delete_btn.clicked.connect(self.remove_text)
self.main_layout.addWidget(delete_btn)
self.setLayout(self.main_layout)
self.resize(250, 100)
@QtCore.Slot()
def remove_text(self):
delete_widget(self.label,self.main_layout)
#check if widget is actually removed
for i in range(self.main_layout.count()):
print self.main_layout.itemAt(i)
def main():
w = PyMaxDialog()
w.show()
def delete_widget(w,parent):
w.hide()
parent.removeWidget(w)
del(w)
if __name__ == '__main__':
main()
