Jaye Evins
f1e50d8574
- Increased polling interval from 1s to 10s - Use QtConcurrent::run to initiate a poll asynchronously to main event loop - Do not initiate a poll if the previous poll has not completed - Use copies instead of references to mCurrentAvailablePrinters in public API
100 lines
2.1 KiB
C++
100 lines
2.1 KiB
C++
/* PrinterMonitor.h
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*
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* Copyright (C) 2025 Jaye Evins <evins@snaught.com>
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*
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* This file is part of gLabels-qt.
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*
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* gLabels-qt is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* gLabels-qt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gLabels-qt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PrinterMonitor_h
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#define PrinterMonitor_h
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#include <QFuture>
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#include <QMutex>
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#include <QObject>
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#include <QStringList>
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#include <QTimer>
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#include <memory>
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namespace glabels
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{
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///
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/// Printer Monitor
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///
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class PrinterMonitor : public QObject
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{
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Q_OBJECT
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/////////////////////////////////
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// Life Cycle
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/////////////////////////////////
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private:
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PrinterMonitor();
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public:
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static PrinterMonitor* instance();
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/////////////////////////////////
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// Public methods
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/////////////////////////////////
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public:
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QStringList availablePrinters();
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/////////////////////////////////
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// Slots
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/////////////////////////////////
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private slots:
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void onTimerTimeout();
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/////////////////////////////////
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// Signals
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/////////////////////////////////
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signals:
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void availablePrintersChanged( QStringList availablePrinters );
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/////////////////////////////////
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// Private methods
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/////////////////////////////////
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private:
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void asyncPoll();
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/////////////////////////////////
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// Private Members
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/////////////////////////////////
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private:
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static std::unique_ptr<PrinterMonitor> mInstance;
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std::unique_ptr<QTimer> mTimer;
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QStringList mCurrentAvailablePrinters;
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QMutex mCurrentAvailablePrintersMutex;
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QFuture<void> mPollStatus;
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};
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}
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#endif // PrinterMonitor_h
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