> For the complete documentation index, see [llms.txt](https://chaoses-ib.gitbook.io/directory-opus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chaoses-ib.gitbook.io/directory-opus/manual/evaluator/applicable_contexts/functions/dynamic_state.md).

# Dynamic State

You can use the evaluator with the various [command modifiers](/directory-opus/manual/reference/command_reference/command_modifier_reference.md) that affect the state of toolbar buttons:

* **@hideif** / **@showif** - dynamically hide or show the button
* **@disableif** / **@enableif** - dynamically disable or enable the button
* **@toggle** - control whether the button appears checked/selected or unchecked/unselected

Note that these modifiers can also be used [without the evaluator](https://chaoses-ib.gitbook.io/directory-opus/manual/evaluator/applicable_contexts/functions/pages/sXKewVCFRUPfAuJLPO5L#@icon), so to use the evaluator you must begin the expression with a `=` character.

![](https://github.com/Chaoses-Ib/DirectoryOpus/blob/main/Manual/evaluator/applicable_contexts/functions/page%3Estandard_variables\&nodate\&nouser\&nofooter)

The return value from the evaluation expression will be used to determine the state. The meaning depends on the modifier in question:

* **@hideif** - return **true** to hide the button, **false** to show it
* **@showif** - return **true** to show the button, **false** to hide it
* **@disableif** - return **true** to disable the button, **false** to enable it
* **@enableif** - return **true** to enable the button, **false** to disable it
* **@toggle** - return **true** if the button should be checked/selected, **false** otherwise