56 lines
1.8 KiB
Markdown
56 lines
1.8 KiB
Markdown
# powerSaveBlocker
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> Block the system from entering low-power (sleep) mode.
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Process: [Main](../glossary.md#main-process)
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For example:
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```javascript
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const {powerSaveBlocker} = require('electron')
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const id = powerSaveBlocker.start('prevent-display-sleep')
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console.log(powerSaveBlocker.isStarted(id))
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powerSaveBlocker.stop(id)
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```
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## Methods
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The `powerSaveBlocker` module has the following methods:
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### `powerSaveBlocker.start(type)`
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* `type` String - Power save blocker type.
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* `prevent-app-suspension` - Prevent the application from being suspended.
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Keeps system active but allows screen to be turned off. Example use cases:
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downloading a file or playing audio.
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* `prevent-display-sleep` - Prevent the display from going to sleep. Keeps
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system and screen active. Example use case: playing video.
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Returns `Integer` - The blocker ID that is assigned to this power blocker
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Starts preventing the system from entering lower-power mode. Returns an integer
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identifying the power save blocker.
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**Note:** `prevent-display-sleep` has higher precedence over
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`prevent-app-suspension`. Only the highest precedence type takes effect. In
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other words, `prevent-display-sleep` always takes precedence over
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`prevent-app-suspension`.
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For example, an API calling A requests for `prevent-app-suspension`, and
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another calling B requests for `prevent-display-sleep`. `prevent-display-sleep`
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will be used until B stops its request. After that, `prevent-app-suspension`
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is used.
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### `powerSaveBlocker.stop(id)`
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* `id` Integer - The power save blocker id returned by `powerSaveBlocker.start`.
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Stops the specified power save blocker.
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### `powerSaveBlocker.isStarted(id)`
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* `id` Integer - The power save blocker id returned by `powerSaveBlocker.start`.
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Returns `Boolean` - Whether the corresponding `powerSaveBlocker` has started.
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