isAt method Null safety

bool isAt(
  1. BuildContext context
)

Returns true if the nearest enclosing Focus widget's node is focused.

A convenience method to allow build methods to write: Focus.isAt(context) to get whether or not the nearest Focus above them in the widget hierarchy currently has the input focus.

Returns false if no Focus widget is found before reaching the nearest FocusScope, or if the root of the focus tree is reached without finding a Focus widget.

Calling this function creates a dependency that will rebuild the given context when the focus changes.

Implementation

static bool isAt(BuildContext context) => Focus.maybeOf(context)?.hasFocus ?? false;