1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
#############################################################################
##
## 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 (QApplication, QListView)
from PySide6.QtCore import QAbstractListModel, QStringListModel, QModelIndex, Qt
#! [0]
class StringListModel(QAbstractListModel):
def __init__(self, strings, parent=None):
super().__init__(parent)
self._strings = strings
#! [0]
def rowCount(self, parent=QModelIndex()):
"""Returns the number of items in the string list as the number of rows
in the model."""
return len(self._strings)
#! [0]
#! [1]
def data(self, index, role):
"""Returns an appropriate value for the requested data.
If the view requests an invalid index, an invalid variant is returned.
Any valid index that corresponds to a string in the list causes that
string to be returned."""
row = index.row()
if not index.isValid() or row >= len(self._strings):
return None
if role != Qt.DisplayRole and role != Qt.EditRole:
return None
return self._strings[row]
#! [1]
#! [2]
def headerData(self, section, orientation, role=Qt.DisplayRole):
"""Returns the appropriate header string depending on the orientation of
the header and the section. If anything other than the display role is
requested, we return an invalid variant."""
if role != Qt.DisplayRole:
return None
if orientation == Qt.Horizontal:
return f"Column {section}"
return f"Row {section}"
#! [2]
#! [3]
def flags(self, index):
"""Returns an appropriate value for the item's flags. Valid items are
enabled, selectable, and editable."""
if not index.isValid():
return Qt.ItemIsEnabled
return super().flags(index) | Qt.ItemIsEditable
#! [3]
#! [4]
def setData(self, index, value, role=Qt.EditRole):
"""Changes an item in the string list, but only if the following conditions
are met:
# The index supplied is valid.
# The index corresponds to an item to be shown in a view.
# The role associated with editing text is specified.
The dataChanged() signal is emitted if the item is changed."""
if index.isValid() and role == Qt.EditRole:
self._strings[index.row()] = value
self.dataChanged.emit(index, index, {role})
return True
#! [4] #! [5]
return False
#! [5]
#! [6]
def insertRows(self, position, rows, parent):
"""Inserts a number of rows into the model at the specified position."""
self.beginInsertRows(QModelIndex(), position, position + rows - 1)
for row in range(rows):
self._strings.insert(position, "")
self.endInsertRows()
return True
#! [6] #! [7]
#! [7]
#! [8]
def removeRows(self, position, rows, parent):
"""Removes a number of rows from the model at the specified position."""
self.beginRemoveRows(QModelIndex(), position, position + rows - 1)
for row in range(rows):
del self._strings[position]
self.endRemoveRows()
return True
#! [8] #! [9]
#! [9]
#! [main0]
if __name__ == '__main__':
app = QApplication(sys.argv)
#! [main1]
numbers = ["One", "Two", "Three", "Four", "Five"]
model = StringListModel(numbers)
#! [main0] #! [main1] #! [main2] #! [main3]
view = QListView()
#! [main2]
view.setWindowTitle("View onto a string list model")
#! [main4]
view.setModel(model)
#! [main3] #! [main4]
model.insertRows(5, 7, QModelIndex())
for row in range(5, 12):
index = model.index(row, 0, QModelIndex())
model.setData(index, f"{row+1}")
#! [main5]
view.show()
sys.exit(app.exec())
#! [main5]
|
