electron/lib/browser/api/power-monitor.js

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const {EventEmitter} = require('events')
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const {powerMonitor, PowerMonitor} = process.atomBinding('power_monitor')
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// PowerMonitor is an EventEmitter.
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Object.setPrototypeOf(PowerMonitor.prototype, EventEmitter.prototype)
EventEmitter.call(powerMonitor)
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// On Linux we need to call blockShutdown() to subscribe to shutdown event.
if (process.platform === 'linux') {
powerMonitor.on('newListener', (event) => {
if (event === 'shutdown' && powerMonitor.listenerCount('shutdown') === 0) {
powerMonitor.blockShutdown()
}
})
powerMonitor.on('removeListener', (event) => {
if (event === 'shutdown' && powerMonitor.listenerCount('shutdown') === 0) {
powerMonitor.unblockShutdown()
}
})
}
module.exports = powerMonitor