File indexing completed on 2025-02-23 04:34:24

 /**
  * \file picturelabel.cpp
  * Label for picture preview.
  *
  * \b Project: Kid3
  * \author Urs Fleisch
  * \date 04 Jan 2009
  *
  * Copyright (C) 2009-2024  Urs Fleisch
  *
  * This file is part of Kid3.
  *
  * Kid3 is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * Kid3 is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "picturelabel.h"
 #include <QLabel>
 #include <QVBoxLayout>
 #include <QHash>
 #include <QByteArray>
 #include <QPixmap>
 #include <QCoreApplication>
 
 namespace {
 
 class PictureLabelIntern : public QLabel {
 public:
   explicit PictureLabelIntern(QWidget* parent = nullptr);
   ~PictureLabelIntern() override = default;
   int heightForWidth(int w) const override;
 
 private:
   Q_DISABLE_COPY(PictureLabelIntern)
 };
 
 PictureLabelIntern::PictureLabelIntern(QWidget* parent) : QLabel(parent)
 {
   setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
   setWordWrap(true);
 }
 
 int PictureLabelIntern::heightForWidth(int w) const
 {
   return w;
 }
 
 }
 
 /**
  * Constructor.
  *
  * @param parent parent widget
  */
 PictureLabel::PictureLabel(QWidget* parent)
   : QWidget(parent), m_pixmapHash(0)
 {
   setObjectName(QLatin1String("PictureLabel"));
   auto layout = new QVBoxLayout(this);
   layout->setContentsMargins(0, 0, 0, 0);
   m_pictureLabel = new PictureLabelIntern;
   layout->addWidget(m_pictureLabel);
   m_sizeLabel = new QLabel;
   m_sizeLabel->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
   layout->addWidget(m_sizeLabel);
   clearPicture();
 }
 
 /**
  * Destructor.
  */
 PictureLabel::~PictureLabel()
 {
   // not inline or default to silence weak-vtables warning
 }
 
 /**
  * Clear picture.
  */
 void PictureLabel::clearPicture()
 {
   const char* const msg = QT_TRANSLATE_NOOP("@default", "Drag album\nartwork\nhere");
   m_pictureLabel->setText(QCoreApplication::translate("@default", msg));
   m_sizeLabel->clear();
 }
 
 /**
  * Set picture data.
  *
  * @param data picture data, empty if no picture is available
  */
 void PictureLabel::setData(const QByteArray& data)
 {
   if (!data.isEmpty()) {
     uint hash = qHash(data);
 #if QT_VERSION >= 0x050f00
     if (!m_pictureLabel->pixmap(Qt::ReturnByValue).isNull() && hash == m_pixmapHash)
 #else
     if (m_pictureLabel->pixmap() && hash == m_pixmapHash)
 #endif
       return; // keep existing pixmap
 
     // creating new pixmap
     if (QPixmap pm; pm.loadFromData(data)) {
       int dimension = m_pictureLabel->width();
       if (QPixmap scaledPm = pm.scaled(dimension, dimension, Qt::KeepAspectRatio);
           !scaledPm.isNull()) {
         m_pixmapHash = hash;
         m_pictureLabel->setContentsMargins(0, 0, 0, 0);
         m_pictureLabel->setPixmap(scaledPm);
         m_sizeLabel->setText(QString::number(pm.width()) + QLatin1Char('x') +
                              QString::number(pm.height()));
         return;
       }
     }
   }
 
   clearPicture();
 }