blob: a9af93a55cfc87ace8d2240711b3ce22ba777fa1 (
plain)
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
|
/**************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
**************************************************************************/
#include "aspectratiolabel.h"
using namespace QInstaller;
/*!
\class QInstaller::AspectRatioLabel
\inmodule QtInstallerFramework
\brief The AspectRatioLabel class provides a label for displaying
a pixmap that maintains its original aspect ratio when resized.
*/
/*!
Constructs the label with \a parent as parent.
*/
AspectRatioLabel::AspectRatioLabel(QWidget *parent)
: QLabel(parent)
{
setMinimumSize(1, 1);
setScaledContents(false);
}
/*!
Sets the \a pixmap shown on the label. Setting a new pixmap clears the previous content.
*/
void AspectRatioLabel::setPixmap(const QPixmap &pixmap)
{
m_pixmap = pixmap;
QLabel::setPixmap(scaledPixmap());
}
/*!
\reimp
*/
int AspectRatioLabel::heightForWidth(int w) const
{
return m_pixmap.isNull()
? height()
: m_pixmap.height() * w / m_pixmap.width();
}
/*!
\reimp
*/
QSize AspectRatioLabel::sizeHint() const
{
const int w = width();
return QSize(w, heightForWidth(w));
}
/*!
Returns the currently set pixmap scaled to the label size,
while preserving the original aspect ratio.
*/
QPixmap AspectRatioLabel::scaledPixmap() const
{
return m_pixmap.isNull()
? QPixmap()
: m_pixmap.scaled(size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
/*!
\reimp
*/
void AspectRatioLabel::resizeEvent(QResizeEvent *event)
{
Q_UNUSED(event);
if (!m_pixmap.isNull())
QLabel::setPixmap(scaledPixmap());
}
|
