1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include "draglabel.h"
52
53#include <QtWidgets>
54
55//! [0]
56DragLabel::DragLabel(const QString &text, QWidget *parent)
57 : QLabel(parent)
58{
59 QFontMetrics metric(font());
60 QSize size = metric.size(flags: Qt::TextSingleLine, str: text);
61
62 QImage image(size.width() + 12, size.height() + 12, QImage::Format_ARGB32_Premultiplied);
63 image.fill(pixel: qRgba(r: 0, g: 0, b: 0, a: 0));
64
65 QFont font;
66 font.setStyleStrategy(QFont::ForceOutline);
67//! [0]
68
69//! [1]
70 QLinearGradient gradient(0, 0, 0, image.height()-1);
71 gradient.setColorAt(pos: 0.0, color: Qt::white);
72 gradient.setColorAt(pos: 0.2, color: QColor(200, 200, 255));
73 gradient.setColorAt(pos: 0.8, color: QColor(200, 200, 255));
74 gradient.setColorAt(pos: 1.0, color: QColor(127, 127, 200));
75
76 QPainter painter;
77 painter.begin(&image);
78 painter.setRenderHint(hint: QPainter::Antialiasing);
79 painter.setBrush(gradient);
80 painter.drawRoundedRect(rect: QRectF(0.5, 0.5, image.width()-1, image.height()-1),
81 xRadius: 25, yRadius: 25, mode: Qt::RelativeSize);
82
83 painter.setFont(font);
84 painter.setBrush(Qt::black);
85 painter.drawText(r: QRect(QPoint(6, 6), size), flags: Qt::AlignCenter, text);
86 painter.end();
87//! [1]
88
89//! [2]
90 setPixmap(QPixmap::fromImage(image));
91 m_labelText = text;
92}
93//! [2]
94
95QString DragLabel::labelText() const
96{
97 return m_labelText;
98}
99

source code of qtbase/examples/widgets/draganddrop/fridgemagnets/draglabel.cpp