a question dropEvent: mouse event freeze when modal window show

[AA130]

the simple code like follow:

import sys

from PyQt5.QtWidgets import QApplication, QDialog, QHBoxLayout, QTreeWidget, QTreeWidgetItem, QMessageBox
from PyQt5.QtCore import QTimer


def timeout():
	msg = QMessageBox(QMessageBox.Warning, "title", "66666")
	msg.exec()


def run():
	qapp = QApplication(sys.argv)

	timer = QTimer()
	timer.setSingleShot(True)
	timer.timeout.connect(timeout)
	timer.start(3000)

	tree = QTreeWidget()
	items = []
	items.append(QTreeWidgetItem(None, ["111"]))
	items.append(QTreeWidgetItem(None, ["222"]))
	items.append(QTreeWidgetItem(None, ["333"]))
	items.append(QTreeWidgetItem(None, ["444"]))

	tree.setSelectionMode(QTreeWidget.ExtendedSelection)
	tree.setHeaderLabels(["Name"])
	tree.setDragEnabled(True)
	tree.setAcceptDrops(True)
	tree.insertTopLevelItems(0, items)

	layout = QHBoxLayout()
	layout.addWidget(tree)

	dlg = QDialog()
	dlg.setLayout(layout)
	dlg.show()

	sys.exit(qapp.exec_())


if __name__ == "__main__":
	run()

drag one of item and keep pressing the mouse left button, when the messagebox shown the program will be freeze

I known the modal window will blocking the event loop, my question is have a solution to cancel the drop event before the modal window show?

my env:
windows 10
python 3.6.8
pyqt 5.13.0

[SGaist]

Hi,

One possible alternative could be to use QMessageBox::open in place of exec.