Method PDFDocumentScene

modules/QtPDF/src/PDFDocumentScene.cpp:31–106

PDFDocumentScene ================ A large canvas that manages the layout of QGraphicsItem subclasses. The primary items we are concerned with are PDFPageGraphicsItem and PDFLinkGraphicsItem.

// primary items we are concerned with are PDFPageGraphicsItem and
// PDFLinkGraphicsItem.
PDFDocumentScene::PDFDocumentScene(QSharedPointer<Backend::Document> a_doc, QObject *parent /* = nullptr */, const double dpiX /* = -1 */, const double dpiY /* = -1 */):
    Super(parent),
    _shownPageIdx(-2),
    _doc(a_doc),
    _lastPage(-1)
{
  Q_ASSERT(a_doc != nullptr);
  // We need to register a QList<PDFLinkGraphicsItem *> meta-type so we can
  // pass it through inter-thread (i.e., queued) connections
  qRegisterMetaType< QList<PDFLinkGraphicsItem *> >();

#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
  _dpiX = (dpiX > 0 ? dpiX : QApplication::desktop()->physicalDpiX());
  _dpiY = (dpiY > 0 ? dpiY : QApplication::desktop()->physicalDpiY());
#else
  // FIXME: The QGraphicsScene should be independent of the hardware it is shown
  // on
  const QList<QGraphicsView *> & v = views();
  if (dpiX > 0)
    _dpiX = dpiX;
  else if (!v.isEmpty())
    _dpiX = v.first()->screen()->physicalDotsPerInchX();
  else
    _dpiX = 72;

  if (dpiY > 0)
    _dpiY = dpiY;
  else if (!v.isEmpty())
    _dpiY = v.first()->screen()->physicalDotsPerInchY();
  else
    _dpiY = 72;
#endif

  connect(&_pageLayout, &PDFPageLayout::layoutChanged, this, static_cast<void (PDFDocumentScene::*)(const QRectF&)>(&PDFDocumentScene::pageLayoutChanged));

  // Initialize the unlock widget
  {
    _unlockWidget = new QWidget();
    QVBoxLayout * layout = new QVBoxLayout();

    _unlockWidgetLockIcon = new QLabel(_unlockWidget);
    _unlockWidgetLockIcon->setPixmap(QIcon::fromTheme(QStringLiteral("status-locked")).pixmap(48));
    _unlockWidgetLockText = new QLabel(_unlockWidget);
    _unlockWidgetUnlockButton = new QPushButton(_unlockWidget);

    connect(_unlockWidgetUnlockButton, &QPushButton::clicked, this, &PDFDocumentScene::doUnlockDialog);

    layout->addWidget(_unlockWidgetLockIcon);
    layout->addWidget(_unlockWidgetLockText);
    layout->addSpacing(20);
    layout->addWidget(_unlockWidgetUnlockButton);

    layout->setAlignment(_unlockWidgetLockIcon, Qt::AlignHCenter);
    layout->setAlignment(_unlockWidgetLockText, Qt::AlignHCenter);
    layout->setAlignment(_unlockWidgetUnlockButton, Qt::AlignHCenter);

    _unlockWidget->setLayout(layout);
    _unlockProxy = new QGraphicsProxyWidget();