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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import sys
from PySide6.QtCore import QItemSelection, Qt, Slot
from PySide6.QtGui import QStandardItem, QStandardItemModel
from PySide6.QtWidgets import QApplication, QMainWindow, QTreeView
"""PySide6 port of the widgets/tutorials/modelview/7_selections example from Qt v6.x"""
#! [1]
class MainWindow(QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self._standard_model = QStandardItemModel(self)
self._tree_view = QTreeView(self)
self.setCentralWidget(self._tree_view)
# defining a couple of items
root_node = self._standard_model.invisibleRootItem()
america_item = QStandardItem("America")
mexico_item = QStandardItem("Canada")
usa_item = QStandardItem("USA")
boston_item = QStandardItem("Boston")
europe_item = QStandardItem("Europe")
italy_item = QStandardItem("Italy")
rome_item = QStandardItem("Rome")
verona_item = QStandardItem("Verona")
# building up the hierarchy
root_node.appendRow(america_item)
root_node.appendRow(europe_item)
america_item.appendRow(mexico_item)
america_item.appendRow(usa_item)
usa_item.appendRow(boston_item)
europe_item.appendRow(italy_item)
italy_item.appendRow(rome_item)
italy_item.appendRow(verona_item)
self._tree_view.setModel(self._standard_model)
self._tree_view.expandAll()
# selection changes shall trigger a slot
selection_model = self._tree_view.selectionModel()
selection_model.selectionChanged.connect(self.selection_changed_slot)
#! [1]
#! [2]
@Slot(QItemSelection, QItemSelection)
def selection_changed_slot(self, new_selection, old_selection):
# get the text of the selected item
index = self._tree_view.selectionModel().currentIndex()
selected_text = index.data(Qt.DisplayRole)
# find out the hierarchy level of the selected item
hierarchy_level = 1
seek_root = index
while seek_root.parent().isValid():
seek_root = seek_root.parent()
hierarchy_level += 1
self.setWindowTitle(f"{selected_text}, Level {hierarchy_level}")
#! [2]
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec())
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