qplatformprintplugin.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qplatformprintplugin.h"
#include "qplatformprintersupport.h"
#include "qprinterinfo.h"
#include "private/qfactoryloader_p.h"
#include <qcoreapplication.h>
#include <qdebug.h>
 
#ifndef QT_NO_PRINTER
 
#if defined(Q_OS_MACOS)
Q_IMPORT_PLUGIN(QCocoaPrinterSupportPlugin)
#elif defined(Q_OS_WIN)
Q_IMPORT_PLUGIN(QWindowsPrinterSupportPlugin)
#endif
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
    (QPlatformPrinterSupportFactoryInterface_iid, "/printsupport"_L1, Qt::CaseInsensitive))
 
QPlatformPrinterSupportPlugin::QPlatformPrinterSupportPlugin(QObject *parent)
    : QObject(parent)
{
}
 
QPlatformPrinterSupportPlugin::~QPlatformPrinterSupportPlugin()
{
}
 
static QPlatformPrinterSupport *printerSupport = nullptr;
 
static void cleanupPrinterSupport()
{
    delete printerSupport;
    printerSupport = nullptr;
}
 
QPlatformPrinterSupport *QPlatformPrinterSupportPlugin::get()
{
    if (!printerSupport) {
        const QMultiMap<int, QString> keyMap = loader()->keyMap();
        QMultiMap<int, QString>::const_iterator it = keyMap.cbegin();
        if (!qEnvironmentVariableIsEmpty("QT_PRINTER_MODULE")) {
            QString module = QString::fromLocal8Bit(qgetenv("QT_PRINTER_MODULE"));
            QMultiMap<int, QString>::const_iterator it2 = std::find_if(keyMap.cbegin(), keyMap.cend(), [module](const QString &value){ return value == module; });
            if (it2 == keyMap.cend())
                qWarning() << "Unable to load printer plugin" << module;
            else
                it = it2;
        }
        if (it != keyMap.cend())
            printerSupport = qLoadPlugin<QPlatformPrinterSupport, QPlatformPrinterSupportPlugin>(loader(), it.value());
        if (printerSupport)
            qAddPostRoutine(cleanupPrinterSupport);
    }
    return printerSupport;
}
 
QT_END_NAMESPACE
 
#include "moc_qplatformprintplugin.cpp"
 
#endif