Events & Event Subscribers

When to Use

Subscribe to Plus Suite events to customize behavior without overriding core module code. Check this catalog before writing new hooks or overrides.

Quick extension point reference:

I Want To...	Subscribe To
Block Edit Mode for certain entities	`ShouldNotEditModeEvent`
Add settings to the sidebar	`SettingsSidebarEvent`
Add custom block properties	`BlockPropertiesEvent`
Set defaults on block placement	`PlaceBlockEvent`
Prevent inline editing on a field	`NoChangeTool` or field third-party settings
Add section-level actions	`SectionToolIndicatorEvent`
Add block-level actions	`BlockToolIndicatorEvent`
Intercept media replacement	`LayoutBuilderReplaceMedia`
Modify form item attributes	`FieldAttributes::ALTER`

Navigation+ events:

Event	When Dispatched
`ShouldNotEditModeEvent`	Before enabling Edit Mode — allows blocking
`SettingsSidebarEvent`	Building settings sidebar — add settings forms
`EditableFieldAttributes`	Rendering fields — add editing attributes
`LayoutBuilderNewMedia`	New media dropped on page
`LayoutBuilderReplaceMedia`	Media replaced on existing block

LB+ events:

Event	When Dispatched
`PlaceBlockEvent`	Block placed from sidebar
`PrepareLayoutEvent`	Before layout renders in edit mode
`SectionToolIndicatorEvent`	Building section hover actions
`BlockToolIndicatorEvent`	Building block hover actions

Edit+ events:

Event	When Dispatched
`FieldAttributes::ALTER`	Before form items rendered
`FieldAttributes::AFTER_BUILD`	After form items built
`BlockPropertiesEvent`	Adding custom block properties
`NoChangeTool`	Checking if Change tool should appear

Twig Events:

Event	When Dispatched
`TwigRenderTemplateEvent`	During every Twig template render

Wrong: Subscribing to TwigRenderTemplateEvent without performance testing → Right: It fires on every template; keep subscribers extremely fast
Wrong: Modifying events after stopping propagation → Right: Downstream subscribers won't see changes if propagation is stopped