/**
  * @RDE_HEADER@
  * A QLabel that rescales the set pixmap with respect of the current aspect ratio
  * $Id: flm_preview_file_dialog.cpp 52224 2020-09-30 12:31:15Z ojog_i $
  * $HeadURL: svn://192.168.133.21/TDS/branches/product/iterations/21_01_chaos/Lts/Plugins/FileManagement/Gui/Explorer/flm_preview_file_dialog.cpp $
  * $Author: ojog_i $
  *
  * Created by Mike Wille, SLTE, 2020-03-03
  */

#include "RatioAwareLabel.h"


RatioAwareLabel::RatioAwareLabel(QWidget *parent)
  : QLabel(parent)
{
  setScaledContents(false);
}


void RatioAwareLabel::setPixmap(const QPixmap &pixmap)
{
  m_pixmap = pixmap;
  scale();
}


int RatioAwareLabel::heightRatio(int width) const
{
  if (m_pixmap.isNull())
    return height();
  return (m_pixmap.height() * width / m_pixmap.width());
}


QSize RatioAwareLabel::sizeHint() const
{
  int w = width();
  return QSize(w, heightRatio(w));
}


void RatioAwareLabel::scale()
{
  if (m_pixmap.isNull())
    return;
  QLabel::setPixmap(m_pixmap.scaled(size(), Qt::KeepAspectRatio, Qt::FastTransformation));
}


void RatioAwareLabel::resizeEvent(QResizeEvent *event)
{
  QLabel::resizeEvent(event);
  scale();
}