#include "lts_elided_label.h"

#include <QPaintEvent>
#include <QResizeEvent>


namespace LtsWidgets
{
void LtsElidedLabel::setElideMode(Qt::TextElideMode elideMode)
{
  m_elideMode = elideMode;
  m_cachedText.clear();
  update();
}

void LtsElidedLabel::resizeEvent(QResizeEvent *e)
{
  QLabel::resizeEvent(e);
  m_cachedText.clear();
}

void LtsElidedLabel::paintEvent(QPaintEvent *e)
{
  if (m_elideMode == Qt::ElideNone)
    return QLabel::paintEvent(e);

  updateCachedTexts();
  QLabel::setText(m_cachedElidedText);
  QLabel::paintEvent(e);
  QLabel::setText(m_cachedText);
}

void LtsElidedLabel::updateCachedTexts()
{
  
  const auto txt = text();
  if (m_cachedText == txt)
    return;
  m_cachedText = txt;
  const QFontMetrics fm(fontMetrics());
  m_cachedElidedText = fm.elidedText(text(),
                                     m_elideMode,
                                     width(),
                                     Qt::TextShowMnemonic);
  if (!m_cachedText.isEmpty())
  {
    const QString showFirstCharacter = m_cachedText.at(0) + QStringLiteral("...");
#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
    const int width = fm.width(showFirstCharacter);
#else
    const int width = fm.horizontalAdvance(showFirstCharacter);
#endif
    setMinimumWidth(width + 1);
  }
}

}