Method Page

modules/QtPDF/src/PDFBackend.cpp:305–334

Page Class ---------- This class is thread-safe. Data access is governed by the QReadWriteLock _pageLock. When accessing the parent document directly (i.e., not via public member functions), the QSharedPointer _docLock must also be acquired. Note that if _docLock and _pageLock are to be acquired, _docLock must be acquired first. Note that the Page may exist in a detached state, i.

// is typically the case when the document discarded the page object but some
// other object (typically in another thread) still holds a QSharedPointer to it.
Page::Page(Document *parent, size_type at, QSharedPointer<QReadWriteLock> docLock):
  _parent(parent),
  _n(at),
  _docLock(docLock)
{
#ifdef DEBUG
//  qDebug() << "Page::Page(" << parent << ", " << at << ")";
#endif

  if (!pageDummyBrush) {
    pageDummyBrush = new QBrush();

    // Make a texture brush which can be used to print "rendering page" all over
    // the dummy tiles that are shown while the rendering thread is doing its
    // work
    QImage brushTex(1024, 1024, QImage::Format_ARGB32);
    QRectF textRect;
    QPainter p;
    p.begin(&brushTex);
    p.fillRect(brushTex.rect(), Qt::white);
    p.setPen(Qt::lightGray);
    p.drawText(brushTex.rect(), Qt::AlignCenter | Qt::AlignVCenter | Qt::TextSingleLine, QCoreApplication::translate("QtPDF::PDFDocumentScene", "rendering page"), &textRect);
    p.end();
    textRect.adjust(-textRect.width() * .05, -textRect.height() * .1, textRect.width() * .05, textRect.height() * .1);
    brushTex = brushTex.copy(textRect.toAlignedRect());

    pageDummyBrush->setTextureImage(brushTex);
    pageDummyBrush->setTransform(QTransform().rotate(-45));
  }
}

Page::size_type Page::pageNum() const { QReadLocker pageLocker(&_pageLock); return _n; }