Removed widget item in QVBoxLayout still visible, why ?

nicholas_yue

I have the following code. I connect out the Clear menu button to an action which goes about removing the items I added.

There was runtime errors that I can see but the widget inside the QVBoxLayout still hang around. Is it because I am deleting them wrongly or I need to call some refresh method explicitly to trigger a redraw of the entire layout ?

main.py

import sys
from PySide2 import QtWidgets, QtGui

from MainWindow import Ui_MainWindow


class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setupUi(self)

        # Further location UI customization
        self.actionQuit.setShortcut(QtGui.QKeySequence.Quit)
        self.actionQuit.triggered.connect(self.close)

        self.actionAdd.triggered.connect(self.Add)
        self.actionClear.triggered.connect(self.Clear)

        vlayout = self.findChild(QtWidgets.QVBoxLayout, "verticalLayout")
        # vlayout.addWidget(QtWidgets.QLabel("Parameters"))

    def Add(self):
        print('Adding')
        self.verticalLayout.addWidget(QtWidgets.QLabel("Adding"))

    def Remove(self):
        print('Remove')
        child = self.verticalLayout.takeAt(0)
        if child:
            self.verticalLayout.removeItem(child)
            del child
            self.verticalLayout.update()

    def Clear(self):
        print('Clear number of widgets = {}'.format(self.verticalLayout.count()))
        child = self.verticalLayout.takeAt(0)
        while child:
            self.verticalLayout.removeItem(child)
            del child
            child = self.verticalLayout.takeAt(0)
        self.verticalLayout.update()

app = QtWidgets.QApplication(sys.argv)

window = MainWindow()
window.show()
app.exec_()

MainWindow.py

# -*- coding: utf-8 -*-

################################################################################
## Form generated from reading UI file 'MainWindow.ui'
##
## Created by: Qt User Interface Compiler version 5.15.2
##
## WARNING! All changes made in this file will be lost when recompiling UI file!
################################################################################

from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if not MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(800, 600)
        self.actionAdd = QAction(MainWindow)
        self.actionAdd.setObjectName(u"actionAdd")
        self.actionClear = QAction(MainWindow)
        self.actionClear.setObjectName(u"actionClear")
        self.actionQuit = QAction(MainWindow)
        self.actionQuit.setObjectName(u"actionQuit")
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.gridLayout = QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName(u"gridLayout")
        self.verticalLayout = QVBoxLayout()
        self.verticalLayout.setObjectName(u"verticalLayout")

        self.gridLayout.addLayout(self.verticalLayout, 0, 0, 1, 1)

        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QMenuBar(MainWindow)
        self.menubar.setObjectName(u"menubar")
        self.menubar.setGeometry(QRect(0, 0, 800, 22))
        self.menuFile = QMenu(self.menubar)
        self.menuFile.setObjectName(u"menuFile")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QStatusBar(MainWindow)
        self.statusbar.setObjectName(u"statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.menubar.addAction(self.menuFile.menuAction())
        self.menuFile.addAction(self.actionAdd)
        self.menuFile.addAction(self.actionClear)
        self.menuFile.addSeparator()
        self.menuFile.addAction(self.actionQuit)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
        self.actionAdd.setText(QCoreApplication.translate("MainWindow", u"Add", None))
        self.actionClear.setText(QCoreApplication.translate("MainWindow", u"Clear", None))
        self.actionQuit.setText(QCoreApplication.translate("MainWindow", u"Quit", None))
        self.menuFile.setTitle(QCoreApplication.translate("MainWindow", u"File", None))
    # retranslateUi

jsulm

@nicholas_yue said in Removed widget item in QVBoxLayout still visible, why ?:

There was runtime errors that I can see

Please post those errors.
Did you make sure that the slot was called?

feiyuhuahuo

Try set the removed item parent to None.