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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.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())
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