38 lines
1.4 KiB
TypeScript
38 lines
1.4 KiB
TypeScript
'use strict';
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import { createLazyInstance } from '../utils';
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const { EventEmitter } = require('events');
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const { createPowerMonitor, PowerMonitor } = process.electronBinding('power_monitor');
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// PowerMonitor is an EventEmitter.
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Object.setPrototypeOf(PowerMonitor.prototype, EventEmitter.prototype);
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const powerMonitor = createLazyInstance(createPowerMonitor, PowerMonitor, true);
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if (process.platform === 'linux') {
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// In order to delay system shutdown when e.preventDefault() is invoked
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// on a powerMonitor 'shutdown' event, we need an org.freedesktop.login1
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// shutdown delay lock. For more details see the "Taking Delay Locks"
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// section of https://www.freedesktop.org/wiki/Software/systemd/inhibit/
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//
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// So here we watch for 'shutdown' listeners to be added or removed and
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// set or unset our shutdown delay lock accordingly.
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const { app } = require('electron');
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app.whenReady().then(() => {
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powerMonitor.on('newListener', (event: string) => {
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// whenever the listener count is incremented to one...
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if (event === 'shutdown' && powerMonitor.listenerCount('shutdown') === 0) {
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powerMonitor.blockShutdown();
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}
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});
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powerMonitor.on('removeListener', (event: string) => {
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// whenever the listener count is decremented to zero...
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if (event === 'shutdown' && powerMonitor.listenerCount('shutdown') === 0) {
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powerMonitor.unblockShutdown();
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}
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});
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});
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}
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module.exports = powerMonitor;
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