PDF Viewer Example

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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, &QComboBox::currentTextChanged, 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); } }