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pdfScene.cpp
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pdfScene.cpp
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/** This file is part of project comment
*
* File: pdfScene.cpp
* Created: 2008-10-17
* Author: Jonathan Verner <[email protected]>
* License: GPL v2 or later
*
* Copyright (C) 2010 Jonathan Verner <[email protected]>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "pdfPageItem.h"
#include "abstractTool.h"
#include "pdfScene.h"
#include "pageBeginItem.h"
#include "pageTextLayer.h"
#include "pdfUtil.h"
#include "sceneLayer.h"
#include "linkLayer.h"
#include "toc.h"
#include <QtCore/QFile>
#include <QtCore/QTemporaryFile>
#include <QtCore/QDebug>
#include <QtCore/QEvent>
#include <poppler-qt4.h>
#include <podofo/podofo.h>
#include <QtCore/QFile>
#include <QtCore/QTemporaryFile>
#include <QtCore/QDebug>
#include <QtCore/QEvent>
#include <poppler-qt4.h>
#include <podofo/podofo.h>
using namespace Poppler;
pdfScene::pdfScene():
pdf(NULL), tempFileName(""), numPages(0), leftSkip(10), pageSkip(10), prop(NULL), TOC(NULL)
{
links = new linkLayer( this );
setBackgroundBrush(Qt::gray);
}
pdfScene::pdfScene( const QSet<abstractTool *> &tools, QString fName ):
tools(tools), pdf(NULL), tempFileName(""), numPages(0), leftSkip(10), pageSkip(10),
prop(NULL), TOC(NULL)
{
links = new linkLayer( this );
setBackgroundBrush(Qt::gray);
if ( fName != "" ) loadFromFile( fName );
}
pdfScene::~pdfScene() {
delete prop;
delete pdf;
delete links;
delete TOC;
// FIXME: further cleanup needed
// cleanup sceneLayers
// cleanup textLayer
// cleanup annotations
}
void pdfScene::registerTool( abstractTool *tool ) {
tools.insert( tool );
}
/* Go through the page pgNum, remove all recognized annotations
* and add them to the annotation list. Nothing is added to the
* scene, this is done only after we load the poppler document */
void pdfScene::processPage( PoDoFo::PdfDocument *pdf, int pgNum ) {
PoDoFo::PdfPage *pg = pdf->GetPage( pgNum );
abstractAnnotation *annot;
pdfCoords transform(pg);
/* The following piece of code iterates through the
* list of annotations and whenever one of the tools
* recognizes the annotation, it is
* 1) converted into the toolAnnotation (i.e. some descendant of abstractAnnotation)
* and added to the internal list of annotations on this page
* 2) deleted from the PoDoFo::PdfPage
*
* However, when we delete an annotation from the page, the
* indexing of the annotations changes so we cannot do a
* straightforward loop through the annotations.
*/
int num_of_retained=0;
bool retainCurAnnot;
while( pg->GetNumAnnots() > num_of_retained ) {
retainCurAnnot=true;
try {
foreach( abstractTool *tool, tools.toList() ) {
if ( annot = tool->processAnnotation( pdf, pg->GetAnnotation( num_of_retained ), &transform ) ) {
try {
pg->DeleteAnnotation( num_of_retained );
annotations[pgNum].append( annot );
retainCurAnnot = false;
} catch ( PoDoFo::PdfError error ) {
qWarning() << "Cannot delete annotation, not leaving it alone.";
}
break;
}
}
} catch ( PoDoFo::PdfError error ) {
qWarning() << "Cannot process annotation:" << error.what();
retainCurAnnot = true;
}
if ( retainCurAnnot ) num_of_retained++;
}
}
/* Loads a pdf into the scene:
* Goes through the pdf pages, converts each to a pdfPageItem
* and adds it to the scene. Also adds all annotations
* from the annotations list belonging to the page onto the scene.
* Populates the pageCorners list. For each page it adds a pageMarker
* item onto the pageItem, (vertically into the middle). When this pageMarker receives
* a paint event, it does nothing but emits a signal (which
* is connected to pageInViewReceiver if not NULL). This is how
* a view knows which page is currently in view. Note that
* if there are different views watching the same scene, this
* will confuse the hell out of them :-) We need to eventually
* move this stuff into the pageView class, but I currently don't
* have the motivation, since in the near future there will always
* be only a single view */
// assumes pdf == NULL ( otherwise there will be a memory leak ! )
void pdfScene::loadPopplerPdf( QString fileName, QObject *pageInViewReceiver, const char *slot ) {
QPointF annotationPos;
pdf = Poppler::Document::load( fileName );
if ( ! pdf ) return;
pdf->setRenderHint( Poppler::Document::TextAntialiasing, true );
pdf->setRenderHint( Poppler::Document::Antialiasing, true );
pdfPageItem *pageItem;
pageBeginItem *beginMarker;
pageCorners.clear();
qreal y=pageSkip;
// wordItem *it;
for(int i = 0; i < numPages; i++ ) {
pageItem = new pdfPageItem( pdf->page( i ) );
pageItem->setPageNum( i );
pageItem->setZValue( 0 );
addItem( pageItem );
pageItem->setPos(leftSkip,y);
pageCorners.append( QPointF( leftSkip, y ) );
qDebug() << "Page("<<i<<"):"<<y<<" == "<<pageCorners[i].y();
QRectF pgSize = pageItem->boundingRect();
// note that passing the third parameter already
// adds beginMarker to the scene, so we need not add
// it again;
beginMarker = new pageBeginItem( i+1, pgSize.width(), pageItem ); // i+1 since pageBeginItem expects page numbers to start from 1
beginMarker->setPos(0, pgSize.height()/2);
y+=pageItem->boundingRect().height()+pageSkip;
// QList<poppler::TextBox*> textList = pageItem->getPage()->textList();
/* foreach( Poppler::TextBox *word, pageItem->getPage()->textList() ) { // add the text layer
it = new wordItem( word );
it->setParentItem( pageItem );
}*/
textLayer.append( new pageTextLayer( pageItem->getPage() ) );
// txt = new textLayer( pageItem->getPage() );
// txt->setParentItem( pageItem );
addPageAnnotations( i, pageItem );
qDebug() << "Page Size:" << pageItem->boundingRect();
qDebug() << i;
connect( beginMarker->getSignalEmitter(), SIGNAL( pageInView(int) ), pageInViewReceiver, slot );
}
}
/* Iterates through the annotations on page pageNum and adds them
* to the scene by setting their parent to pageItem. Note this
* requires the annotations to have their positions relative to
* the page they belong to. Called from loadPoppler.*/
// pageNum is zero-based
void pdfScene::addPageAnnotations( int pageNum, QGraphicsItem *pageItem ) {
if ( pageNum < annotations.size() ) {
foreach( abstractAnnotation *a, annotations[pageNum] ) {
a->setParentItem( pageItem );
}
}
}
void pdfScene::generateTempFileName() { // FIXME: can fail !!!
QTemporaryFile fl;
fl.open();
tempFileName = QFile::encodeName( fl.fileName() );
return;
}
bool pdfScene::loadFromFile( QString fileName, QObject *pageInViewReceiver, const char *slot ) {
if ( !QFile::exists(fileName) ) return false;
QByteArray flnm = QFile::encodeName( fileName );
PoDoFo::PdfMemDocument pdfDoc;
try {
pdfDoc.Load( flnm.data() );
} catch ( PoDoFo::PdfError error ) {
qDebug() << "Error loading file:" << error.what();
return false;
}
links->loadFromDoc( &pdfDoc );
numPages = pdfDoc.GetPageCount();
annotations.resize( numPages );
for(int i = 0; i< numPages; i++ ) processPage( &pdfDoc, i );
if ( tempFileName == "" ) generateTempFileName(); // FIXME: may fail !!!
pdfDoc.Write( tempFileName.data() );
loadPopplerPdf( tempFileName, pageInViewReceiver, slot );
annotations.clear();
myFileName = fileName;
prop = new pdfProperties;
fillPdfProperties();
delete TOC;
TOC = new toc( links, &pdfDoc );
emit finishedLoading();
return true;
}
bool pdfScene::saveToFile( QString fileName ) {
PoDoFo::PdfMemDocument pdfDoc;
PoDoFo::PdfPage *pg;
pdfPageItem *pgItem;
pdfCoords coords;
abstractAnnotation *a;
try {
pdfDoc.Load( tempFileName );
} catch ( PoDoFo::PdfError error ) {
qDebug() << "Error loading file:" << error.what();
return false;
}
links->saveToDoc( &pdfDoc );
foreach( QGraphicsItem *item, items() ) {
if ( a = dynamic_cast< abstractAnnotation *>(item) ) {
pgItem = dynamic_cast<pdfPageItem*>(a->parentItem());
if ( ! pgItem ) {
qWarning() << "Annotation does not have a parent page, adding to page 0...";
pgItem=getPageItem(0);
if ( !pgItem ) {
qWarning() << "Page 0 missing, this is really WEIRD!!!";
continue;
}
}
qDebug() << " Saving annotation on page " << pgItem->getPageNum();
pg = pdfDoc.GetPage( pgItem->getPageNum() );
coords.setPage( pg );
a->saveToPdfPage( &pdfDoc, pg, &coords );
}
}
savePdfProperties( &pdfDoc );
pdfDoc.Write( QFile::encodeName( fileName ).data() );
return true;
}
void pdfScene::savePdfProperties( PoDoFo::PdfMemDocument *doc ) {
PoDoFo::PdfInfo *info = doc->GetInfo();
info->SetAuthor( pdfUtil::qStringToPdf( prop->author ) );
info->SetTitle( pdfUtil::qStringToPdf( prop->title ) );
info->SetSubject( pdfUtil::qStringToPdf( prop->subject ) );
info->SetKeywords( pdfUtil::qStringToPdf( prop->keywords ) );
};
void pdfScene::setPdfProperties( struct pdfProperties& p ) {
*prop = p;
return;
}
void pdfScene::getPdfProperties( struct pdfProperties& p ) {
p = *prop;
return;
}
void pdfScene::fillPdfProperties() {
prop->author=pdf->info("Author");
prop->title=pdf->info("Title");
prop->subject=pdf->info("Subject");
prop->keywords=pdf->info("Keywords");
return;
}
/* FIXME: For safety reasons first save the file to a temporary
* location and try to load it and do some sanity checks on it.
* If it does not load, return false otherwise move it to myFilename.
* */
bool pdfScene::save() {
saveToFile( myFileName );
/*
QTemporaryFile *tmpSave = new QTemporaryFile( QDir::tempPath()+"/tempSaveXXXXXX" );
tmpSave->setAutoRemove(false);
saveToFile( tmpSave->fileName() );
PoDoFo::PdfMemDocument pdfDoc;
try {
pdfDoc.Load( tmpSave->fileName() );
} catch ( PoDoFo::PdfError error ) {
qCritical() << "Cannot load the saved file:" << error.what();
qCritical() << "Saving backup to :" << myFileName+"~backup";
QFile::copy( tmpSave->fileName(), myFileName+"~backup" );
return false;
}
if ( pdfDoc.GetPageCount() != numPages ) {
qCritical() << "Page count mismatch when saving file"
qCritical() << "Saving backup to :" << myFileName+"~backup";
QFile::copy( tmpSave->fileName(), myFileName+"~backup" );
return false;
}*/
}
void pdfScene::placeAnnotation( abstractAnnotation *annot, const QPointF *scPos ) {
int pg = posToPage( *scPos );
QGraphicsItem *parentPage = getPageItem( pg );
annot->setPos( parentPage->mapFromScene( *scPos ) );
annot->setParentItem( parentPage );
qDebug() << "Placing Annotation at page " << pg << " relative position " << parentPage->mapFromScene( *scPos ) << "=="<<annot->pos()<< " absolute position " << *scPos;
}
pdfPageItem *pdfScene::getPageItem( int pgNum ) {
QPointF topLeft = topLeftPage( pgNum );
pdfPageItem *pg;
foreach( QGraphicsItem *item, items( topLeft ) ) {
if ( pg = dynamic_cast<pdfPageItem*>( item ) ) {
if ( pg->getPageNum() == pgNum ) return pg;
}
}
return NULL;
}
int pdfScene::posToPage( const QPointF &scenePos ) {
qreal pos = scenePos.y();
int min = 0, max = pageCorners.size()-1, pivot=min+(max-min)/2,dist;
if ( max < min ) return min;
qreal pivotVal;
while( min < max ) {
dist=(max-min);
pivotVal = pageCorners[pivot].y();
if ( pos < pivotVal ) max = pivot;
else if (pivotVal < pos ) min = pivot;
else return pivot;
pivot = min+(max-min)/2;
if ( (max-min) >=dist ) {
if ( pageCorners[max].y() < pos ) return max;
return min;
}
}
return pivot;
};
QPointF pdfScene::topLeftPage( int page ) {
if ( page < pageCorners.size() ) return pageCorners[page];
return QPointF(0,0);
}
sceneLayer *pdfScene::addLayer() {
sceneLayer *ret = new sceneLayer( this );
sceneLayers.append( ret );
return ret;
}
void pdfScene::removeLayer( sceneLayer *layer ) {
sceneLayers.removeAll( layer );
delete layer;
}
QList<TextBox *> pdfScene::selectText( QPointF from, QPointF to ) {
int pg = posToPage( from );
Q_ASSERT( pg < textLayer.size() );
QPointF fromP, toP;
pdfPageItem *Page = getPageItem( pg );
fromP = Page->mapFromScene( from );
toP = Page->mapFromScene( to );
return textLayer[pg]->select( fromP, toP );
}
QList< pageSelections > pdfScene::findText( QString text, int startPage, int endPage ) {
int totalNumOfMatches = 0;
if ( endPage == -1 || endPage >= numPages ) endPage = numPages;
if ( startPage < 0 ) startPage = 0;
QList< pageSelections > ret;
pageSelections sel;
ret.clear();
for( int i = startPage; i < endPage; ++i ) {
sel.pageNum = i;
sel.selections=textLayer[i]->findText( text );
if ( sel.selections.size() > 0 ) {
ret.append( sel );
totalNumOfMatches += sel.selections.size();
}
}
return ret;
}
QString pdfScene::selectedText( QPointF from, QPointF to ) {
QList<TextBox*> selection = selectText( from, to );
QString ret;
foreach( TextBox *box, selection ) ret+=box->text()+" ";
return ret;
}
#include "pdfScene.moc"