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
162
163
164
165
166
167
168
169
170
171
172
173
|
#############################################################################
##
## Copyright (C) 2010 Hans-Peter Jansen <hpj@urpla.net>
## Copyright (C) 2011 Arun Srinivasan <rulfzid@gmail.com>
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: http://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."
##
## $QT_END_LICENSE$
##
#############################################################################
from PySide6.QtWidgets import QStyledItemDelegate, QStyle
from starrating import StarRating
from stareditor import StarEditor
class StarDelegate(QStyledItemDelegate):
""" A subclass of QStyledItemDelegate that allows us to render our
pretty star ratings.
"""
def __init__(self, parent=None):
super().__init__(parent)
def paint(self, painter, option, index):
""" Paint the items in the table.
If the item referred to by <index> is a StarRating, we handle the
painting ourselves. For the other items, we let the base class
handle the painting as usual.
In a polished application, we'd use a better check than the
column number to find out if we needed to paint the stars, but
it works for the purposes of this example.
"""
if index.column() == 3:
star_rating = StarRating(index.data())
# If the row is currently selected, we need to make sure we
# paint the background accordingly.
if option.state & QStyle.State_Selected:
# The original C++ example used option.palette.foreground() to
# get the brush for painting, but there are a couple of
# problems with that:
# - foreground() is obsolete now, use windowText() instead
# - more importantly, windowText() just returns a brush
# containing a flat color, where sometimes the style
# would have a nice subtle gradient or something.
# Here we just use the brush of the painter object that's
# passed in to us, which keeps the row highlighting nice
# and consistent.
painter.fillRect(option.rect, painter.brush())
# Now that we've painted the background, call starRating.paint()
# to paint the stars.
star_rating.paint(painter, option.rect, option.palette)
else:
QStyledItemDelegate.paint(self, painter, option, index)
def sizeHint(self, option, index):
""" Returns the size needed to display the item in a QSize object. """
if index.column() == 3:
star_rating = StarRating(index.data())
return star_rating.sizeHint()
else:
return QStyledItemDelegate.sizeHint(self, option, index)
# The next 4 methods handle the custom editing that we need to do.
# If this were just a display delegate, paint() and sizeHint() would
# be all we needed.
def createEditor(self, parent, option, index):
""" Creates and returns the custom StarEditor object we'll use to edit
the StarRating.
"""
if index.column() == 3:
editor = StarEditor(parent)
editor.editing_finished.connect(self.commit_and_close_editor)
return editor
else:
return QStyledItemDelegate.createEditor(self, parent, option, index)
def setEditorData(self, editor, index):
""" Sets the data to be displayed and edited by our custom editor. """
if index.column() == 3:
editor.star_rating = StarRating(index.data())
else:
QStyledItemDelegate.setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
""" Get the data from our custom editor and stuffs it into the model.
"""
if index.column() == 3:
model.setData(index, editor.star_rating.star_count)
else:
QStyledItemDelegate.setModelData(self, editor, model, index)
def commit_and_close_editor(self):
""" Erm... commits the data and closes the editor. :) """
editor = self.sender()
# The commitData signal must be emitted when we've finished editing
# and need to write our changed back to the model.
self.commitData.emit(editor)
self.closeEditor.emit(editor, QStyledItemDelegate.NoHint)
if __name__ == "__main__":
""" Run the application. """
from PySide6.QtWidgets import (QApplication, QTableWidget, QTableWidgetItem,
QAbstractItemView)
import sys
app = QApplication(sys.argv)
# Create and populate the tableWidget
table_widget = QTableWidget(4, 4)
table_widget.setItemDelegate(StarDelegate())
table_widget.setEditTriggers(QAbstractItemView.DoubleClicked |
QAbstractItemView.SelectedClicked)
table_widget.setSelectionBehavior(QAbstractItemView.SelectRows)
table_widget.setHorizontalHeaderLabels(["Title", "Genre", "Artist", "Rating"])
data = [ ["Mass in B-Minor", "Baroque", "J.S. Bach", 5],
["Three More Foxes", "Jazz", "Maynard Ferguson", 4],
["Sex Bomb", "Pop", "Tom Jones", 3],
["Barbie Girl", "Pop", "Aqua", 5] ]
for r in range(len(data)):
table_widget.setItem(r, 0, QTableWidgetItem(data[r][0]))
table_widget.setItem(r, 1, QTableWidgetItem(data[r][1]))
table_widget.setItem(r, 2, QTableWidgetItem(data[r][2]))
item = QTableWidgetItem()
item.setData(0, StarRating(data[r][3]).star_count)
table_widget.setItem(r, 3, item)
table_widget.resizeColumnsToContents()
table_widget.resize(500, 300)
table_widget.show()
sys.exit(app.exec_())
|
