zoomselector.cpp Example File

pdfviewer/zoomselector.cpp

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  ** Contact: http://www.qt.io/licensing/
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  #include "zoomselector.h"

  #include <QLineEdit>

  ZoomSelector::ZoomSelector(QWidget *parent)
      : QComboBox(parent)
  {
      setEditable(true);

      addItem(QLatin1String("Fit Width"));
      addItem(QLatin1String("Fit Page"));
      addItem(QLatin1String("12%"));
      addItem(QLatin1String("25%"));
      addItem(QLatin1String("33%"));
      addItem(QLatin1String("50%"));
      addItem(QLatin1String("66%"));
      addItem(QLatin1String("75%"));
      addItem(QLatin1String("100%"));
      addItem(QLatin1String("125%"));
      addItem(QLatin1String("150%"));
      addItem(QLatin1String("200%"));
      addItem(QLatin1String("400%"));

      connect(this, static_cast<void(QComboBox::*)(const QString &)>(&QComboBox::currentIndexChanged),
              this, &ZoomSelector::onCurrentTextChanged);

      connect(lineEdit(), &QLineEdit::editingFinished,
              this, [this](){onCurrentTextChanged(lineEdit()->text()); });
  }

  void ZoomSelector::setZoomFactor(qreal zoomFactor)
  {
      setCurrentText(QString::number(qRound(zoomFactor * 100)) + QLatin1String("%"));
  }

  void ZoomSelector::reset()
  {
      setCurrentIndex(8); // 100%
  }

  void ZoomSelector::onCurrentTextChanged(const QString &text)
  {
      if (text == QLatin1String("Fit Width")) {
          emit zoomModeChanged(QPdfView::FitToWidth);
      } else if (text == QLatin1String("Fit Page")) {
          emit zoomModeChanged(QPdfView::FitInView);
      } else {
          qreal factor = 1.0;

          QString withoutPercent(text);
          withoutPercent.remove(QLatin1Char('%'));

          bool ok = false;
          const int zoomLevel = withoutPercent.toInt(&ok);
          if (ok)
              factor = zoomLevel / 100.0;

          emit zoomModeChanged(QPdfView::CustomZoom);
          emit zoomFactorChanged(factor);
      }
  }