Method updateProblemsButton

src/mainwindow.cpp:918–976

}

void MainWindow::updateProblemsButton()
{
  // if the current stylesheet doesn't provide an icon, this is used instead
  const char* DefaultIconName = ":/MO/gui/warning";

  const std::size_t numProblems = m_NumberOfProblems;

  // original icon without a count painted on it
  const QIcon original = m_originalNotificationIcon.isNull()
                             ? QIcon(DefaultIconName)
                             : m_originalNotificationIcon;

  // final icon
  QIcon final;

  if (numProblems > 0) {
    ui->actionNotifications->setToolTip(tr("There are notifications to read"));

    // will contain the original icon, plus a notification count; this also
    // makes sure the pixmap is exactly 64x64 by requesting the icon that's
    // as close to 64x64 as possible, and then scaling it up if it's too small
    QPixmap merged = original.pixmap(64, 64).scaled(64, 64);

    {
      QPainter painter(&merged);

      const std::string badgeName =
          std::string(":/MO/gui/badge_") +
          (numProblems < 10 ? std::to_string(static_cast<long long>(numProblems))
                            : "more");

      painter.drawPixmap(32, 32, 32, 32, QPixmap(badgeName.c_str()));
    }

    final = QIcon(merged);
  } else {
    ui->actionNotifications->setToolTip(tr("There are no notifications"));

    // no change
    final = original;
  }

  ui->actionNotifications->setEnabled(numProblems > 0);

  // setting the icon on the action (shown on the menu)
  ui->actionNotifications->setIcon(final);

  // setting the icon on the toolbar button
  if (auto* actionWidget = ui->toolBar->widgetForAction(ui->actionNotifications)) {
    if (auto* button = dynamic_cast<QAbstractButton*>(actionWidget)) {
      button->setIcon(final);
    }
  }

  // updating the status bar, may be null very early when MO is starting
  if (ui->statusBar) {
    ui->statusBar->setNotifications(numProblems > 0);
  }