Falkon/falkonOfficial
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falkonOfficial/src/lib/app/fileprinter.cpp
Kevin Kofler b9bd2338e4 Add initial printing support with QtWebEngine >= 5.7.0 (#2068) 
* Add initial printing support with QtWebEngine >= 5.7.0

This works by printing to PDF first, then sending the PDF to a printer
if printing to a physical printer was requested.

On *nix (including Mac OS X), we use the lpr command, which is typically
provided by CUPS nowadays. Currently, no options beyond the printer name
are passed, there is room for improvement there. (Okular has a
FilePrinter class that handles this in a more sophisticated way.)

On Windows, we use ShellExecuteW with the "printto" verb. In that case,
the printer name is unfortunately the only thing that can be passed. The
user experience may also be suboptimal depending on the PDF viewer
installed on the system. (E.g., Adobe Reader is reported to ignore
SW_HIDE.) And if there is no PDF viewer installed at all, it will of
course not work at all. But it is the best we can do without bundling
something like GhostScript (or requiring the user to install it).

* Printing: Let lpr autoremove the temporary file instead of QTemporaryFile

Only lpr knows for sure when it is safe to delete the temporary file.

* Printing: Use the callback version of printToPdf instead of the file one

The file version is also asynchronous and does not report when it is
done.

* Printing: Use async QProcess API instead of QProcess::execute to run lpr

This also required making tempFile a QTemporaryFile * instead of a
QTemporaryFile on the stack, because QTemporaryFile is a QObject and
cannot be copied.

* Printing: Adapt the FilePrinter from Okular to pass correct lpr args

The license of those files is GPLv2+, which is compatible with
QupZilla's GPLv3+ licensing.
2016-09-14 14:07:07 +02:00

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/***************************************************************************
* Copyright (C) 2007,2010 by John Layt <john@layt.net> *
* *
* Adaptations for QupZilla *
* Copyright (C) 2016 by Kevin Kofler <kevin.kofler@chello.at> *
* *
* FilePrinterPreview based on KPrintPreview (originally LGPL) *
* Copyright (c) 2007 Alex Merry <huntedhacker@tiscali.co.uk> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
***************************************************************************/
#include "fileprinter.h"
#include <QtPrintSupport/QPrinter>
#include <QPrintEngine>
#include <QStringList>
#include <QSize>
#include <QtCore/QFile>
#include <QtCore/QFileInfo>
#include <QtCore/QProcess>
#include <QtWidgets/QLabel>
#include <QtGui/QShowEvent>
#include <QtNetwork/QTcpSocket>
#include <QStandardPaths>
using namespace Qz;
void FilePrinter::printFile( QPrinter *printer, const QString &file,
FileDeletePolicy fileDeletePolicy,
PageSelectPolicy pageSelectPolicy, const QString &pageRange )
{
FilePrinter fp;
fp.doPrintFile( *printer, file, fileDeletePolicy, pageSelectPolicy, pageRange );
}
void FilePrinter::doPrintFile( QPrinter &printer, const QString &file, FileDeletePolicy fileDeletePolicy,
PageSelectPolicy pageSelectPolicy, const QString &pageRange )
{
if (!QFile::exists(file)) {
return;
}
bool doDeleteFile = (fileDeletePolicy == FilePrinter::SystemDeletesFiles);
if ( printer.printerState() == QPrinter::Aborted || printer.printerState() == QPrinter::Error ) {
if ( doDeleteFile ) {
QFile::remove( file );
}
return;
}
// Print to a printer via lpr command
//Decide what executable to use to print with, need the CUPS version of lpr if available
//Some distros name the CUPS version of lpr as lpr-cups or lpr.cups so try those first
//before default to lpr, or failing that to lp
QString exe;
if ( !QStandardPaths::findExecutable(QStringLiteral("lpr-cups")).isEmpty() ) {
exe = QStringLiteral("lpr-cups");
} else if ( !QStandardPaths::findExecutable(QStringLiteral("lpr.cups")).isEmpty() ) {
exe = QStringLiteral("lpr.cups");
} else if ( !QStandardPaths::findExecutable(QStringLiteral("lpr")).isEmpty() ) {
exe = QStringLiteral("lpr");
} else if ( !QStandardPaths::findExecutable(QStringLiteral("lp")).isEmpty() ) {
exe = QStringLiteral("lp");
} else {
if ( doDeleteFile ) {
QFile::remove( file );
}
return;
}
bool useCupsOptions = cupsAvailable();
QStringList argList = printArguments( printer, fileDeletePolicy, pageSelectPolicy,
useCupsOptions, pageRange, exe ) << file;
QProcess *process = new QProcess();
QObject::connect(process, static_cast<void (QProcess::*)(QProcess::ProcessError)>(&QProcess::error), [=](QProcess::ProcessError) {
if ( doDeleteFile ) {
QFile::remove( file );
}
process->deleteLater();
});
QObject::connect(process, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), [=](int exitCode, QProcess::ExitStatus exitStatus) {
if ( doDeleteFile && (exitStatus != QProcess::NormalExit || exitCode != 0) ) {
// lpr failed, so delete the temporary file in case it still exists.
// In case of success, we let lpr delete it, it knows best when it is safe to do so.
// (lpr queues jobs asynchronously.)
QFile::remove( file );
}
process->deleteLater();
});
process->start( exe, argList );
}
bool FilePrinter::cupsAvailable()
{
#if defined(Q_OS_OSX)
return true;
#elif defined(Q_OS_UNIX)
// Ideally we would have access to the private Qt method
// QCUPSSupport::cupsAvailable() to do this as it is very complex routine.
// However, if CUPS is available then QPrinter::numCopies() will always return 1
// whereas if CUPS is not available it will return the real number of copies.
// This behaviour is guaranteed never to change, so we can use it as a reliable substitute.
QPrinter testPrinter;
testPrinter.setNumCopies( 2 );
return ( testPrinter.numCopies() == 1 );
#else
return false;
#endif
}
QStringList FilePrinter::printArguments( QPrinter &printer, FileDeletePolicy fileDeletePolicy,
PageSelectPolicy pageSelectPolicy, bool useCupsOptions,
const QString &pageRange, const QString &version )
{
QStringList argList;
if ( ! destination( printer, version ).isEmpty() ) {
argList << destination( printer, version );
}
if ( ! copies( printer, version ).isEmpty() ) {
argList << copies( printer, version );
}
if ( ! jobname( printer, version ).isEmpty() ) {
argList << jobname( printer, version );
}
if ( ! pages( printer, pageSelectPolicy, pageRange, useCupsOptions, version ).isEmpty() ) {
argList << pages( printer, pageSelectPolicy, pageRange, useCupsOptions, version );
}
if ( useCupsOptions && ! cupsOptions( printer ).isEmpty() ) {
argList << cupsOptions( printer );
}
if ( ! deleteFile( printer, fileDeletePolicy, version ).isEmpty() ) {
argList << deleteFile( printer, fileDeletePolicy, version );
}
if ( version == QLatin1String("lp") ) {
argList << QStringLiteral("--");
}
return argList;
}
QStringList FilePrinter::destination( QPrinter &printer, const QString &version )
{
if ( version == QLatin1String("lp") ) {
return QStringList(QStringLiteral("-d")) << printer.printerName();
}
if ( version.startsWith( QLatin1String("lpr") ) ) {
return QStringList(QStringLiteral("-P")) << printer.printerName();
}
return QStringList();
}
QStringList FilePrinter::copies( QPrinter &printer, const QString &version )
{
int cp = printer.actualNumCopies();
if ( version == QLatin1String("lp") ) {
return QStringList(QStringLiteral("-n")) << QStringLiteral("%1").arg( cp );
}
if ( version.startsWith( QLatin1String("lpr") ) ) {
return QStringList() << QStringLiteral("-#%1").arg( cp );
}
return QStringList();
}
QStringList FilePrinter::jobname( QPrinter &printer, const QString &version )
{
if ( ! printer.docName().isEmpty() ) {
if ( version == QLatin1String("lp") ) {
return QStringList(QStringLiteral("-t")) << printer.docName();
}
if ( version.startsWith( QLatin1String("lpr") ) ) {
const QString shortenedDocName = QString::fromUtf8(printer.docName().toUtf8().left(255));
return QStringList(QStringLiteral("-J")) << shortenedDocName;
}
}
return QStringList();
}
QStringList FilePrinter::deleteFile( QPrinter &, FileDeletePolicy fileDeletePolicy, const QString &version )
{
if ( fileDeletePolicy == FilePrinter::SystemDeletesFiles && version.startsWith( QLatin1String("lpr") ) ) {
return QStringList(QStringLiteral("-r"));
}
return QStringList();
}
QStringList FilePrinter::pages( QPrinter &printer, PageSelectPolicy pageSelectPolicy, const QString &pageRange,
bool useCupsOptions, const QString &version )
{
if ( pageSelectPolicy == FilePrinter::SystemSelectsPages ) {
if ( printer.printRange() == QPrinter::Selection && ! pageRange.isEmpty() ) {
if ( version == QLatin1String("lp") ) {
return QStringList(QStringLiteral("-P")) << pageRange ;
}
if ( version.startsWith( QLatin1String("lpr") ) && useCupsOptions ) {
return QStringList(QStringLiteral("-o")) << QStringLiteral("page-ranges=%1").arg( pageRange );
}
}
if ( printer.printRange() == QPrinter::PageRange ) {
if ( version == QLatin1String("lp") ) {
return QStringList(QStringLiteral("-P")) << QStringLiteral("%1-%2").arg( printer.fromPage() )
.arg( printer.toPage() );
}
if ( version.startsWith( QLatin1String("lpr") ) && useCupsOptions ) {
return QStringList(QStringLiteral("-o")) << QStringLiteral("page-ranges=%1-%2").arg( printer.fromPage() )
.arg( printer.toPage() );
}
}
}
return QStringList(); // AllPages
}
QStringList FilePrinter::cupsOptions( QPrinter &printer )
{
QStringList optionList;
if ( ! optionMedia( printer ).isEmpty() ) {
optionList << optionMedia( printer );
}
if ( ! optionDoubleSidedPrinting( printer ).isEmpty() ) {
optionList << optionDoubleSidedPrinting( printer );
}
if ( ! optionPageOrder( printer ).isEmpty() ) {
optionList << optionPageOrder( printer );
}
if ( ! optionCollateCopies( printer ).isEmpty() ) {
optionList << optionCollateCopies( printer );
}
optionList << optionCupsProperties( printer );
return optionList;
}
QStringList FilePrinter::optionMedia( QPrinter &printer )
{
if ( ! mediaPageSize( printer ).isEmpty() &&
! mediaPaperSource( printer ).isEmpty() ) {
return QStringList(QStringLiteral("-o")) <<
QStringLiteral("media=%1,%2").arg( mediaPageSize( printer ) )
.arg( mediaPaperSource( printer ) );
}
if ( ! mediaPageSize( printer ).isEmpty() ) {
return QStringList(QStringLiteral("-o")) <<
QStringLiteral("media=%1").arg( mediaPageSize( printer ) );
}
if ( ! mediaPaperSource( printer ).isEmpty() ) {
return QStringList(QStringLiteral("-o")) <<
QStringLiteral("media=%1").arg( mediaPaperSource( printer ) );
}
return QStringList();
}
QString FilePrinter::mediaPageSize( QPrinter &printer )
{
switch ( printer.pageSize() ) {
case QPrinter::A0: return QStringLiteral("A0");
case QPrinter::A1: return QStringLiteral("A1");
case QPrinter::A2: return QStringLiteral("A2");
case QPrinter::A3: return QStringLiteral("A3");
case QPrinter::A4: return QStringLiteral("A4");
case QPrinter::A5: return QStringLiteral("A5");
case QPrinter::A6: return QStringLiteral("A6");
case QPrinter::A7: return QStringLiteral("A7");
case QPrinter::A8: return QStringLiteral("A8");
case QPrinter::A9: return QStringLiteral("A9");
case QPrinter::B0: return QStringLiteral("B0");
case QPrinter::B1: return QStringLiteral("B1");
case QPrinter::B10: return QStringLiteral("B10");
case QPrinter::B2: return QStringLiteral("B2");
case QPrinter::B3: return QStringLiteral("B3");
case QPrinter::B4: return QStringLiteral("B4");
case QPrinter::B5: return QStringLiteral("B5");
case QPrinter::B6: return QStringLiteral("B6");
case QPrinter::B7: return QStringLiteral("B7");
case QPrinter::B8: return QStringLiteral("B8");
case QPrinter::B9: return QStringLiteral("B9");
case QPrinter::C5E: return QStringLiteral("C5"); //Correct Translation?
case QPrinter::Comm10E: return QStringLiteral("Comm10"); //Correct Translation?
case QPrinter::DLE: return QStringLiteral("DL"); //Correct Translation?
case QPrinter::Executive: return QStringLiteral("Executive");
case QPrinter::Folio: return QStringLiteral("Folio");
case QPrinter::Ledger: return QStringLiteral("Ledger");
case QPrinter::Legal: return QStringLiteral("Legal");
case QPrinter::Letter: return QStringLiteral("Letter");
case QPrinter::Tabloid: return QStringLiteral("Tabloid");
case QPrinter::Custom: return QStringLiteral("Custom.%1x%2mm")
.arg( printer.heightMM() )
.arg( printer.widthMM() );
default: return QString();
}
}
// What about Upper and MultiPurpose? And others in PPD???
QString FilePrinter::mediaPaperSource( QPrinter &printer )
{
switch ( printer.paperSource() ) {
case QPrinter::Auto: return QString();
case QPrinter::Cassette: return QStringLiteral("Cassette");
case QPrinter::Envelope: return QStringLiteral("Envelope");
case QPrinter::EnvelopeManual: return QStringLiteral("EnvelopeManual");
case QPrinter::FormSource: return QStringLiteral("FormSource");
case QPrinter::LargeCapacity: return QStringLiteral("LargeCapacity");
case QPrinter::LargeFormat: return QStringLiteral("LargeFormat");
case QPrinter::Lower: return QStringLiteral("Lower");
case QPrinter::MaxPageSource: return QStringLiteral("MaxPageSource");
case QPrinter::Middle: return QStringLiteral("Middle");
case QPrinter::Manual: return QStringLiteral("Manual");
case QPrinter::OnlyOne: return QStringLiteral("OnlyOne");
case QPrinter::Tractor: return QStringLiteral("Tractor");
case QPrinter::SmallFormat: return QStringLiteral("SmallFormat");
default: return QString();
}
}
QStringList FilePrinter::optionDoubleSidedPrinting( QPrinter &printer )
{
switch ( printer.duplex() ) {
case QPrinter::DuplexNone: return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=one-sided");
case QPrinter::DuplexAuto: if ( printer.orientation() == QPrinter::Landscape ) {
return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-short-edge");
} else {
return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-long-edge");
}
case QPrinter::DuplexLongSide: return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-long-edge");
case QPrinter::DuplexShortSide: return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-short-edge");
default: return QStringList(); //Use printer default
}
}
QStringList FilePrinter::optionPageOrder( QPrinter &printer )
{
if ( printer.pageOrder() == QPrinter::LastPageFirst ) {
return QStringList(QStringLiteral("-o")) << QStringLiteral("outputorder=reverse");
}
return QStringList(QStringLiteral("-o")) << QStringLiteral("outputorder=normal");
}
QStringList FilePrinter::optionCollateCopies( QPrinter &printer )
{
if ( printer.collateCopies() ) {
return QStringList(QStringLiteral("-o")) << QStringLiteral("Collate=True");
}
return QStringList(QStringLiteral("-o")) << QStringLiteral("Collate=False");
}
QStringList FilePrinter::optionCupsProperties( QPrinter &printer )
{
QStringList dialogOptions = printer.printEngine()->property(QPrintEngine::PrintEnginePropertyKey(0xfe00)).toStringList();
QStringList cupsOptions;
for ( int i = 0; i < dialogOptions.count(); i = i + 2 ) {
if ( dialogOptions[i+1].isEmpty() ) {
cupsOptions << QStringLiteral("-o") << dialogOptions[i];
} else {
cupsOptions << QStringLiteral("-o") << dialogOptions[i] + QLatin1Char('=') + dialogOptions[i+1];
}
}
return cupsOptions;
}
/* kate: replace-tabs on; indent-width 4; */
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