key property

Key? key
final

A Key is an identifier for Widgets, Elements and SemanticsNodes.

A new widget will only be used to update an existing element if its key is the same as the key of the current widget associated with the element.

Keys must be unique amongst the Elements with the same parent.

Subclasses of Key should either subclass LocalKey or GlobalKey.

See also:

  • Widget.key, which discusses how widgets use keys.

Implementation

final Key? key;