Method PDFDocumentView

modules/QtPDF/src/PDFDocumentView.cpp:58–123

This class descends from `QGraphicsView` and is responsible for controlling and displaying the contents of a `Document` using a `QGraphicsScene`.

// This class descends from `QGraphicsView` and is responsible for controlling
// and displaying the contents of a `Document` using a `QGraphicsScene`.
PDFDocumentView::PDFDocumentView(QWidget *parent /* = nullptr */):
  Super(parent)
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
  qRegisterMetaType<QtPDF::PDFSearcher::size_type>("QtPDF::PDFSearcher::size_type");
#endif
  initResources();
  setBackgroundRole(QPalette::Dark);
  setAlignment(Qt::AlignCenter);
  setFocusPolicy(Qt::StrongFocus);

  QColor fillColor(Qt::darkYellow);
  fillColor.setAlphaF(0.3f);
  _searchResultHighlightBrush = QBrush(fillColor);

  fillColor = QColor(Qt::yellow);
  fillColor.setAlphaF(0.6f);
  _currentSearchResultHighlightBrush = QBrush(fillColor);

  // If _currentPage is not set to -1, the compiler may default to 0. In that
  // case, `goFirst()` or `goToPage(0)` will fail because the view will think
  // it is already looking at page 0.
  _currentPage = -1;

  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::ZoomIn(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::ZoomOut(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::MagnifyingGlass(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::MarqueeZoom(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::Move(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::ContextClick(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::Measure(this)));
  registerTool(std::unique_ptr<DocumentTool::AbstractTool>(new DocumentTool::Select(this)));

  // Some tools (e.g., the Select tool) may need to be informed of mouse events
  // (e.g., mouseMoveEvent) when armed, even before a mouse button is pressed
  viewport()->setMouseTracking(true);

  // We deliberately set the mouse mode to a different value above so we can
  // call setMouseMode (which bails out if the mouse mode is not changed), which
  // in turn sets up other variables such as _toolAccessors
  setMouseMode(MouseMode_MagnifyingGlass);

  connect(&_searcher, &PDFSearcher::resultReady, this, &PDFDocumentView::searchResultReady);
  connect(&_searcher, &PDFSearcher::progressValueChanged, this, &PDFDocumentView::searchProgressValueChanged);

  showRuler(false);
  connect(&_ruler, &PDFRuler::dragStart, this, [this](QPoint pos, Qt::Edge origin) {
    const Qt::Orientation orientation = [](Qt::Edge origin) {
      switch (origin) {
        case Qt::TopEdge:
        case Qt::BottomEdge:
          return Qt::Horizontal;
        case Qt::LeftEdge:
        case Qt::RightEdge:
          return Qt::Vertical;
      }
      return Qt::Horizontal;
    }(origin);