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basic_action_system.md: note on AnAction.update

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Yann Cébron 2021-10-06 15:42:20 +02:00
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topics/basics/basic_action_system.md
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@ -45,6 +45,7 @@ However, the `update()` and `actionPerformed()` methods are essential to basic o
### Overriding the AnAction.update Method
The method `AnAction.update()` is periodically called by the IntelliJ Platform in response to user gestures.
The `update()` method gives an action to evaluate the current context and enable or disable its functionality.
Implementors must ensure that changing presentation and availability status handles all variants and state transitions; otherwise, the given Action will get "stuck".
> The `AnAction.update()` method can be called frequently and on a UI thread.
This method needs to _execute very quickly_; no real work should be performed in this method.