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
109 lines
2.3 KiB
C++
109 lines
2.3 KiB
C++
/* PrinterMonitor.cpp
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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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#include "PrinterMonitor.h"
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#include <QDebug>
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#include <QMutexLocker>
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#include <QPrinterInfo>
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#include <QtConcurrentRun>
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namespace glabels
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{
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///
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/// Static data
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///
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std::unique_ptr<PrinterMonitor> PrinterMonitor::mInstance;
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///
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/// Constructor
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///
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PrinterMonitor::PrinterMonitor()
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{
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using namespace std::chrono_literals;
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mCurrentAvailablePrinters = QPrinterInfo::availablePrinterNames();
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mTimer.reset( new QTimer( this ) );
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connect( mTimer.get(), SIGNAL(timeout()), this, SLOT(onTimerTimeout()) );
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mTimer->start( 10s );
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}
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///
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/// Get singleton instance
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///
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PrinterMonitor* PrinterMonitor::instance()
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{
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if ( !mInstance )
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{
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mInstance.reset( new PrinterMonitor() );
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}
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return mInstance.get();
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}
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///
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/// Get available printers
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///
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QStringList PrinterMonitor::availablePrinters()
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{
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QMutexLocker mutex( &mCurrentAvailablePrintersMutex );
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return mCurrentAvailablePrinters;
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}
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///
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/// On timer timeout
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///
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void PrinterMonitor::onTimerTimeout()
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{
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// Make sure previous poll is complete before starting a new one
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if ( mPollStatus.isFinished() )
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{
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mPollStatus = QtConcurrent::run( &PrinterMonitor::asyncPoll, this );
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}
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}
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///
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/// Asynchronous poll
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///
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void PrinterMonitor::asyncPoll()
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{
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auto newAvailablePrinters = QPrinterInfo::availablePrinterNames();
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if ( newAvailablePrinters != mCurrentAvailablePrinters )
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{
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QMutexLocker mutex( &mCurrentAvailablePrintersMutex );
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mCurrentAvailablePrinters = newAvailablePrinters;
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emit availablePrintersChanged( mCurrentAvailablePrinters );
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}
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}
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} // namespace glabels
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