[android-components](../../../index.md) / [mozilla.components.concept.toolbar](../../index.md) / [Toolbar](../index.md) / [OnEditListener](index.md) / [onStartEditing](./on-start-editing.md)

# onStartEditing

`open fun onStartEditing(): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/concept/toolbar/src/main/java/mozilla/components/concept/toolbar/Toolbar.kt#L142)

Fired when the toolbar switches to edit mode.

