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/**************************************************************************
**
** Copyright (C) 2022 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"
#include <QDesktopServices>
#include <QTimer>
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)
, m_discardMousePress(false)
{
setMinimumSize(1, 1);
setScaledContents(false);
setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
}
/*!
Sets the \a pixmap shown on the label. Setting a new pixmap clears
the previous content.
\note This redefines the non-virtual slot of the same signature from the
QLabel base class, which results in non polymorphic behavior when
called via a base class pointer.
*/
void AspectRatioLabel::setPixmap(const QPixmap &pixmap)
{
setPixmapAndUrl(pixmap, QString());
}
/*!
Sets the \a pixmap shown on the label and an \a url. Setting a new
pixmap clears the previous content. When clicking the \a pixmap, \a url
is opened in a browser. If the \a url is a reference to a file, it will
be opened with a suitable application instead of a Web browser.
*/
void AspectRatioLabel::setPixmapAndUrl(const QPixmap &pixmap, const QString &url)
{
m_clickableUrl = url;
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
{
if (m_pixmap.isNull())
return QPixmap();
return m_pixmap.scaled(size() * m_pixmap.devicePixelRatio(),
Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
/*!
\reimp
*/
void AspectRatioLabel::resizeEvent(QResizeEvent *event)
{
Q_UNUSED(event);
if (!m_pixmap.isNull())
QLabel::setPixmap(scaledPixmap());
}
/*!
\reimp
*/
void AspectRatioLabel::mousePressEvent(QMouseEvent* event)
{
Q_UNUSED(event)
if (!m_clickableUrl.isEmpty() && !m_discardMousePress)
QDesktopServices::openUrl(m_clickableUrl);
}
/*!
\reimp
*/
bool AspectRatioLabel::event(QEvent *e)
{
if (e->type() == QEvent::WindowActivate) {
QTimer::singleShot(100, [&]() {
m_discardMousePress = false;
});
} else if (e->type() == QEvent::WindowDeactivate) {
m_discardMousePress = true;
}
return QLabel::event(e);
}
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