Manages focus state for an input. Request, check, or listen for focus changes programmatically.

final _focusNode = FocusNode();

@override
void dispose() {
  _focusNode.dispose();
  super.dispose();
}

TextField(
  focusNode: _focusNode,
)

// Request focus
_focusNode.requestFocus();

// Check if focused
if (_focusNode.hasFocus) { ... }