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+#############################################################################
+##
+## Copyright (C) 2022 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+## * Redistributions of source code must retain the above copyright
+## notice, this list of conditions and the following disclaimer.
+## * Redistributions in binary form must reproduce the above copyright
+## notice, this list of conditions and the following disclaimer in
+## the documentation and/or other materials provided with the
+## distribution.
+## * Neither the name of The Qt Company Ltd nor the names of its
+## contributors may be used to endorse or promote products derived
+## from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+import sys
+
+from PySide6.QtWidgets import (QAbstractItemView, QApplication, QMainWindow,
+ QListView)
+from PySide6.QtCore import (QByteArray, QDataStream, QIODevice, QMimeData,
+ QModelIndex, QStringListModel, Qt)
+
+
+class DragDropListModel(QStringListModel):
+ """A simple model that uses a QStringList as its data source."""
+
+ def __init__(self, strings, parent=None):
+ super().__init__(strings, parent)
+
+#! [0]
+
+ def canDropMimeData(self, data, action, row, column, parent):
+ if not data.hasFormat("application/vnd.text.list"):
+ return False
+
+ if column > 0:
+ return False
+
+ return True
+#! [0]
+#! [1]
+ def dropMimeData(self, data, action, row, column, parent):
+ if not self.canDropMimeData(data, action, row, column, parent):
+ return False
+
+ if action == Qt.IgnoreAction:
+ return True
+#! [1]
+
+#! [2]
+ begin_row = 0
+
+ if row != -1:
+ begin_row = row
+#! [2] #! [3]
+ elif parent.isValid():
+ begin_row = parent.row()
+#! [3] #! [4]
+ else:
+ begin_row = self.rowCount(QModelIndex())
+#! [4]
+
+#! [5]
+ encoded_data = data.data("application/vnd.text.list")
+ stream = QDataStream(encoded_data, QIODevice.ReadOnly)
+ new_items = []
+ while not stream.atEnd():
+ new_items.append(stream.readQString())
+#! [5]
+
+#! [6]
+ self.insertRows(begin_row, len(new_items), QModelIndex())
+ for text in new_items:
+ idx = self.index(begin_row, 0, QModelIndex())
+ self.setData(idx, text)
+ begin_row += 1
+
+ return True
+#! [6]
+
+#! [7]
+ def flags(self, index):
+ default_flags = super().flags(index)
+ if index.isValid():
+ return Qt.ItemIsDragEnabled | Qt.ItemIsDropEnabled | default_flags
+ return Qt.ItemIsDropEnabled | default_flags
+#! [7]
+
+#! [8]
+ def mimeData(self, indexes):
+ mime_data = QMimeData()
+ encoded_data = QByteArray()
+ stream = QDataStream(encoded_data, QIODevice.WriteOnly)
+ for index in indexes:
+ if index.isValid():
+ text = self.data(index, Qt.DisplayRole)
+ stream.writeQString(text)
+
+ mime_data.setData("application/vnd.text.list", encoded_data)
+ return mime_data
+#! [8]
+
+#! [9]
+ def mimeTypes(self):
+ return ["application/vnd.text.list"]
+#! [9]
+
+#! [10]
+ def supportedDropActions(self):
+ return Qt.CopyAction | Qt.MoveAction
+#! [10]
+
+
+class MainWindow(QMainWindow):
+
+ def __init__(self, parent=None):
+ super().__init__(parent)
+
+ file_menu = self.menuBar().addMenu("&File")
+ quit_action = file_menu.addAction("E&xit")
+ quit_action.setShortcut("Ctrl+Q")
+
+#! [mainwindow0]
+ self._list_view = QListView(self)
+ self._list_view.setSelectionMode(QAbstractItemView.ExtendedSelection)
+ self._list_view.setDragEnabled(True)
+ self._list_view.setAcceptDrops(True)
+ self._list_view.setDropIndicatorShown(True)
+#! [mainwindow0]
+
+ quit_action.triggered.connect(self.close)
+
+ self.setup_list_items()
+
+ self.setCentralWidget(self._list_view)
+ self.setWindowTitle("List View")
+
+ def setup_list_items(self):
+ items = ["Oak", "Fir", "Pine", "Birch", "Hazel", "Redwood", "Sycamore",
+ "Chestnut", "Mahogany"]
+ model = DragDropListModel(items, self)
+ self._list_view.setModel(model)
+
+
+if __name__ == '__main__':
+ app = QApplication(sys.argv)
+ window = MainWindow()
+ window.show()
+ sys.exit(app.exec())