110 lines
3.6 KiB
Markdown
110 lines
3.6 KiB
Markdown
# powerMonitor
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> Monitor power state changes.
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Process: [Main](../glossary.md#main-process)
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## Events
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The `powerMonitor` module emits the following events:
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### Event: 'suspend'
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Emitted when the system is suspending.
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### Event: 'resume'
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Emitted when system is resuming.
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### Event: 'on-ac' _macOS_ _Windows_
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Emitted when the system changes to AC power.
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### Event: 'on-battery' _macOS_ _Windows_
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Emitted when system changes to battery power.
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### Event: 'thermal-state-change' _macOS_
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* `state` string - The system's new thermal state. Can be `unknown`, `nominal`, `fair`, `serious`, `critical`.
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Emitted when the thermal state of the system changes. Notification of a change
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in the thermal status of the system, such as entering a critical temperature
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range. Depending on the severity, the system might take steps to reduce said
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temperature, for example, throttling the CPU or switching on the fans if
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available.
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Apps may react to the new state by reducing expensive computing tasks (e.g.
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video encoding), or notifying the user. The same state might be received
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repeatedly.
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See https://developer.apple.com/library/archive/documentation/Performance/Conceptual/power_efficiency_guidelines_osx/RespondToThermalStateChanges.html
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### Event: 'speed-limit-change' _macOS_ _Windows_
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* `limit` number - The operating system's advertised speed limit for CPUs, in percent.
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Notification of a change in the operating system's advertised speed limit for
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CPUs, in percent. Values below 100 indicate that the system is impairing
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processing power due to thermal management.
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### Event: 'shutdown' _Linux_ _macOS_
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Emitted when the system is about to reboot or shut down. If the event handler
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invokes `e.preventDefault()`, Electron will attempt to delay system shutdown in
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order for the app to exit cleanly. If `e.preventDefault()` is called, the app
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should exit as soon as possible by calling something like `app.quit()`.
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### Event: 'lock-screen' _macOS_ _Windows_
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Emitted when the system is about to lock the screen.
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### Event: 'unlock-screen' _macOS_ _Windows_
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Emitted as soon as the systems screen is unlocked.
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### Event: 'user-did-become-active' _macOS_
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Emitted when a login session is activated. See [documentation](https://developer.apple.com/documentation/appkit/nsworkspacesessiondidbecomeactivenotification?language=objc) for more information.
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### Event: 'user-did-resign-active' _macOS_
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Emitted when a login session is deactivated. See [documentation](https://developer.apple.com/documentation/appkit/nsworkspacesessiondidresignactivenotification?language=objc) for more information.
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## Methods
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The `powerMonitor` module has the following methods:
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### `powerMonitor.getSystemIdleState(idleThreshold)`
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* `idleThreshold` Integer
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Returns `string` - The system's current idle state. Can be `active`, `idle`, `locked` or `unknown`.
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Calculate the system idle state. `idleThreshold` is the amount of time (in seconds)
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before considered idle. `locked` is available on supported systems only.
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### `powerMonitor.getSystemIdleTime()`
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Returns `Integer` - Idle time in seconds
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Calculate system idle time in seconds.
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### `powerMonitor.getCurrentThermalState()` _macOS_
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Returns `string` - The system's current thermal state. Can be `unknown`, `nominal`, `fair`, `serious`, or `critical`.
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### `powerMonitor.isOnBatteryPower()`
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Returns `boolean` - Whether the system is on battery power.
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To monitor for changes in this property, use the `on-battery` and `on-ac`
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events.
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## Properties
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### `powerMonitor.onBatteryPower`
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A `boolean` property. True if the system is on battery power.
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See [`powerMonitor.isOnBatteryPower()`](#powermonitorisonbatterypower).
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