Monitor power state changes.
powerMonitor module emits the following events:
Emitted when the system is suspending.
Emitted when system is resuming.
Event: 'on-ac' macOS Windows
Emitted when the system changes to AC power.
Event: 'on-battery' macOS Windows
Emitted when system changes to battery power.
Event: 'thermal-state-change' macOS
statestring - The system's new thermal state. Can be
Emitted when the thermal state of the system changes. Notification of a change in the thermal status of the system, such as entering a critical temperature range. Depending on the severity, the system might take steps to reduce said temperature, for example, throttling the CPU or switching on the fans if available.
Apps may react to the new state by reducing expensive computing tasks (e.g. video encoding), or notifying the user. The same state might be received repeatedly.
Event: 'speed-limit-change' macOS Windows
limitnumber - The operating system's advertised speed limit for CPUs, in percent.
Notification of a change in the operating system's advertised speed limit for CPUs, in percent. Values below 100 indicate that the system is impairing processing power due to thermal management.
Event: 'shutdown' Linux macOS
Emitted when the system is about to reboot or shut down. If the event handler
e.preventDefault(), Electron will attempt to delay system shutdown in
order for the app to exit cleanly. If
e.preventDefault() is called, the app
should exit as soon as possible by calling something like
Event: 'lock-screen' macOS Windows
Emitted when the system is about to lock the screen.
Event: 'unlock-screen' macOS Windows
Emitted as soon as the systems screen is unlocked.
Event: 'user-did-become-active' macOS
Emitted when a login session is activated. See documentation for more information.
Event: 'user-did-resign-active' macOS
Emitted when a login session is deactivated. See documentation for more information.
powerMonitor module has the following methods:
string - The system's current idle state. Can be
Calculate the system idle state.
idleThreshold is the amount of time (in seconds)
before considered idle.
locked is available on supported systems only.
Integer - Idle time in seconds
Calculate system idle time in seconds.
string - The system's current thermal state. Can be
boolean - Whether the system is on battery power.
To monitor for changes in this property, use the
boolean property. True if the system is on battery power.