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| |
| #include "qplatformprintplugin.h" |
| #include "qplatformprintersupport.h" |
| #include "qprinterinfo.h" |
| #include "private/qfactoryloader_p.h" |
| #include <qcoreapplication.h> |
| #include <qdebug.h> |
| |
| #ifndef QT_NO_PRINTER |
| |
| QT_BEGIN_NAMESPACE |
| |
| Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader, |
| (QPlatformPrinterSupportFactoryInterface_iid, QLatin1String("/printsupport"), Qt::CaseInsensitive)) |
| |
| QPlatformPrinterSupportPlugin::QPlatformPrinterSupportPlugin(QObject *parent) |
| : QObject(parent) |
| { |
| } |
| |
| QPlatformPrinterSupportPlugin::~QPlatformPrinterSupportPlugin() |
| { |
| } |
| |
| static QPlatformPrinterSupport *printerSupport = nullptr; |
| |
| static void cleanupPrinterSupport() |
| { |
| delete printerSupport; |
| printerSupport = nullptr; |
| } |
| |
| /*! |
| \internal |
| |
| Returns a lazily-initialized singleton. Ownership is granted to the |
| QPlatformPrinterSupportPlugin, which is never unloaded or destroyed until |
| application exit, i.e. you can expect this pointer to always be valid and |
| multiple calls to this function will always return the same pointer. |
| */ |
| 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 |
| |
| #endif |