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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtPDF module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qpdflinkmodel_p.h"
#include "qpdflinkmodel_p_p.h"
#include "qpdfdocument_p.h"
#include "third_party/pdfium/public/fpdf_doc.h"
#include "third_party/pdfium/public/fpdf_text.h"
#include <QLoggingCategory>
#include <QMetaEnum>
QT_BEGIN_NAMESPACE
Q_LOGGING_CATEGORY(qLcLink, "qt.pdf.links")
QPdfLinkModel::QPdfLinkModel(QObject *parent)
: QAbstractListModel(*(new QPdfLinkModelPrivate()), parent)
{
QMetaEnum rolesMetaEnum = metaObject()->enumerator(metaObject()->indexOfEnumerator("Role"));
for (int r = Qt::UserRole; r < int(Role::_Count); ++r)
m_roleNames.insert(r, QByteArray(rolesMetaEnum.valueToKey(r)).toLower());
}
QPdfLinkModel::~QPdfLinkModel() {}
QHash<int, QByteArray> QPdfLinkModel::roleNames() const
{
return m_roleNames;
}
int QPdfLinkModel::rowCount(const QModelIndex &parent) const
{
Q_D(const QPdfLinkModel);
Q_UNUSED(parent)
return d->links.count();
}
QVariant QPdfLinkModel::data(const QModelIndex &index, int role) const
{
Q_D(const QPdfLinkModel);
const QPdfLinkModelPrivate::Link &link = d->links.at(index.row());
switch (Role(role)) {
case Role::Rect:
return link.rect;
case Role::Url:
return link.url;
case Role::Page:
return link.page;
case Role::Location:
return link.location;
case Role::Zoom:
return link.zoom;
case Role::_Count:
break;
}
if (role == Qt::DisplayRole)
return link.toString();
return QVariant();
}
QPdfDocument *QPdfLinkModel::document() const
{
Q_D(const QPdfLinkModel);
return d->document;
}
void QPdfLinkModel::setDocument(QPdfDocument *document)
{
Q_D(QPdfLinkModel);
if (d->document == document)
return;
disconnect(d->document, &QPdfDocument::statusChanged, this, &QPdfLinkModel::onStatusChanged);
connect(document, &QPdfDocument::statusChanged, this, &QPdfLinkModel::onStatusChanged);
d->document = document;
emit documentChanged();
if (page())
setPage(0);
else
d->update();
}
int QPdfLinkModel::page() const
{
Q_D(const QPdfLinkModel);
return d->page;
}
void QPdfLinkModel::setPage(int page)
{
Q_D(QPdfLinkModel);
if (d->page == page)
return;
d->page = page;
emit pageChanged(page);
d->update();
}
QPdfLinkModelPrivate::QPdfLinkModelPrivate() : QAbstractItemModelPrivate()
{
}
void QPdfLinkModelPrivate::update()
{
Q_Q(QPdfLinkModel);
if (!document || !document->d->doc)
return;
auto doc = document->d->doc;
const QPdfMutexLocker lock;
FPDF_PAGE pdfPage = FPDF_LoadPage(doc, page);
if (!pdfPage) {
qWarning() << "failed to load page" << page;
return;
}
double pageHeight = FPDF_GetPageHeight(pdfPage);
q->beginResetModel();
links.clear();
// Iterate the ordinary links
int linkStart = 0;
bool ok = true;
while (ok) {
FPDF_LINK linkAnnot;
ok = FPDFLink_Enumerate(pdfPage, &linkStart, &linkAnnot);
if (!ok)
break;
FS_RECTF rect;
ok = FPDFLink_GetAnnotRect(linkAnnot, &rect);
if (!ok)
break;
Link linkData;
linkData.rect = QRectF(rect.left, pageHeight - rect.top,
rect.right - rect.left, rect.top - rect.bottom);
FPDF_DEST dest = FPDFLink_GetDest(doc, linkAnnot);
FPDF_ACTION action = FPDFLink_GetAction(linkAnnot);
if (FPDFAction_GetType(action) != PDFACTION_GOTO) {
qWarning() << "link action type" << FPDFAction_GetType(action) << "is not yet supported";
continue;
}
linkData.page = FPDFDest_GetDestPageIndex(doc, dest);
FPDF_BOOL hasX, hasY, hasZoom;
FS_FLOAT x, y, zoom;
ok = FPDFDest_GetLocationInPage(dest, &hasX, &hasY, &hasZoom, &x, &y, &zoom);
if (!ok)
break;
if (hasX && hasY)
linkData.location = QPointF(x, pageHeight - y);
if (hasZoom)
linkData.zoom = zoom;
links << linkData;
}
// Iterate the web links
FPDF_TEXTPAGE textPage = FPDFText_LoadPage(pdfPage);
if (textPage) {
FPDF_PAGELINK webLinks = FPDFLink_LoadWebLinks(textPage);
if (webLinks) {
int count = FPDFLink_CountWebLinks(webLinks);
for (int i = 0; i < count; ++i) {
Link linkData;
int len = FPDFLink_GetURL(webLinks, i, nullptr, 0);
if (len < 1) {
qWarning() << "URL" << i << "has length" << len;
} else {
QVector<unsigned short> buf(len);
int got = FPDFLink_GetURL(webLinks, i, buf.data(), len);
Q_ASSERT(got == len);
linkData.url = QString::fromUtf16(buf.data(), got - 1);
}
FPDFLink_GetTextRange(webLinks, i, &linkData.textStart, &linkData.textCharCount);
len = FPDFLink_CountRects(webLinks, i);
for (int r = 0; r < len; ++r) {
double left, top, right, bottom;
bool success = FPDFLink_GetRect(webLinks, i, r, &left, &top, &right, &bottom);
if (success) {
linkData.rect = QRectF(left, pageHeight - top, right - left, top - bottom);
links << linkData;
}
}
}
FPDFLink_CloseWebLinks(webLinks);
}
FPDFText_ClosePage(textPage);
}
// All done
FPDF_ClosePage(pdfPage);
if (Q_UNLIKELY(qLcLink().isDebugEnabled())) {
for (const Link &l : links)
qCDebug(qLcLink) << l.rect << l.toString();
}
q->endResetModel();
}
void QPdfLinkModel::onStatusChanged(QPdfDocument::Status status)
{
Q_D(QPdfLinkModel);
qCDebug(qLcLink) << "sees document statusChanged" << status;
if (status == QPdfDocument::Ready)
d->update();
}
QString QPdfLinkModelPrivate::Link::toString() const
{
QString ret;
if (page >= 0)
return QLatin1String("page ") + QString::number(page) +
QLatin1String(" location ") + QString::number(location.x()) + QLatin1Char(',') + QString::number(location.y()) +
QLatin1String(" zoom ") + QString::number(zoom);
else
return url.toString();
}
QT_END_NAMESPACE
#include "moc_qpdflinkmodel_p.cpp"
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