How to add ellipses to the end of a QTreeWidgetItem in PyQt6?

[wayfarer]

I'm playing around with an idea for an app that uses a QTreeWidget for part of its interface (unrelated to my earlier question on this forum - this is a different project), but the QTreeWidgetItem text goes over the edge of the window and vanishes if it's long enough.

I don't want a word or line-wrapping solution since I'd prefer to keep each line of text on its own line, so I'm trying to figure out how to add ellipses to the end of any line that goes over the edge.

I did a bunch of web searches and figured out a partial solution, but it doesn't work right at different/multiple font sizes and it doesn't adjust when the window is resized:

import sys
from PyQt6.QtWidgets import QApplication, QMainWindow, QTreeWidget, QTreeWidgetItem, QLabel
from PyQt6.QtCore import Qt, QSize
from PyQt6.QtGui import QIcon, QAction, QFontMetrics

class MainWindow(QMainWindow):
	def __init__(self):
		super().__init__()
		self.setWindowTitle('Tree')
		self.setMinimumWidth(500), self.setMinimumHeight(400)
		tree = QTreeWidget(self)
		tree.setColumnCount(1)
		tree.setHeaderLabel('Entries')
		entries = ['Entry 1','Entry 2','Entry wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee']
		for item in entries:
			entry = QTreeWidgetItem(tree)
			label = QLabel()
			label.setTextFormat(Qt.TextFormat.RichText)
			metrics = QFontMetrics(label.font())
			elidedText = metrics.elidedText(item, Qt.TextElideMode.ElideRight, 400)
			label.setText(f"<h3 style='margin-bottom: 0;'>{elidedText}</h3><span style='color: gray; font-size: 18px;'>{elidedText}</span>")
			tree.setItemWidget(entry, 0, label)
		self.setCentralWidget(tree)
		items = tree.findItems("", Qt.MatchFlag.MatchContains, 0)
		items[0].setSelected(True)

app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()

[jsulm]

@wayfarer You're setting font size in setText - are you sure it is same as what was set before when elidedText was calculated?
Regarding resizing the window: you will need to do these calculations again when the window is resized, currently you don't do that.