How to clear QVBoxLayout by a Signal?

[porsol]

I'm trying to clear QVBoxLayout with self.vbox.takeAt(0), but previous vboxes clog up the QWidget and would not go away. New appear on top of the old ones.

#! /usr/bin/env python
from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QVBoxLayout, QHBoxLayout
from PyQt5.QtCore import QThread, QObject, pyqtSignal, pyqtSlot
import time, random

class Worker(QObject):
	CLEAR_VBOX = pyqtSignal()
	intReady = pyqtSignal(int)
	
	@pyqtSlot()
	def procCounter(self):
		for i in range(1, 100):
			self.CLEAR_VBOX.emit()
			self.intReady.emit(i)
			time.sleep(1)

class Form(QWidget):
	def __init__(self):
		super().__init__()
		
		self.obj = Worker()
		self.thread = QThread()
		self.obj.intReady.connect(self.onIntReady)
		self.obj.moveToThread(self.thread)

		self.obj.CLEAR_VBOX.connect(self.clearvbox)
		
		self.thread.started.connect(self.obj.procCounter)
		self.thread.start()
		self.initUI()


	def initUI(self):
		self.vbox = QVBoxLayout()
		self.setLayout(self.vbox)
		
		self.setGeometry(333, 333, 222, 222)
		self.show()
		
	def clearvbox(self):
		while self.vbox.count():
			# ~ # break
			self.vbox.takeAt(0)
	
	def onIntReady(self, i):
		hbox = QHBoxLayout()
						
		for ii in range(i):
			ll = QLabel(str(random.randint(1,9)))		
			hbox.addWidget(ll)

		self.vbox.addLayout(hbox)

app = QApplication([])
form = Form()
app.exec_()

[SGaist]

Hi,

Not a direct answer but since you want to show a random sized list of numbers why not use a QListView with a QStringListModel for that ? It would likely be simpler to manage.

[porsol]

@SGaist I just simplified the code with Random numbers for demonstration.

[jsulm]

@porsol I think you need to delete/hide widgets you're removing from the layout as removing them from the layout does not delete or hide them.

[mrjj]

Hi
takeAt only give you ownership back of the widget.

However, in most cases where you want to reuse layouts,
its far easier to use a place holder widget, that has the layout.
To replace it, you simply delete the placeholder widget
and allocate a new one (with empty layout) and insert into the layout.

[porsol]

def clearvbox(self, L = False):
	if not L:
		L = self.vbox
	if L is not None:
		while L.count():
			item = L.takeAt(0)
			
			widget = item.widget()
			
			if widget is not None:
				widget.deleteLater()
			else:
				self.clearvbox(item.layout())