Focus class

A widget that manages a FocusNode to allow keyboard focus tracking and traversal in the widget tree.

Automatically mounts the supplied focusNode to the closest ancestor focus scope on State.didChangeDependencies and unmounts it on State.dispose to ensure the keyboard focus tree stays synchronized with the layout.

Example

final node = FocusNode();
Focus(
  focusNode: node,
  autofocus: true,
  child: MyInputWidget(),
)

Inheritance

• Object
• Widget
• StatefulWidget
• Focus

Constructors

Focus({required Widget child, required FocusNode focusNode, bool autofocus = false})

Creates a new Focus widget.

const

Properties

autofocus → bool

Whether this focus node should automatically request focus when mounted.

final

child → Widget

The child subtree that this focus widget hosts.

final

focusNode → FocusNode

The focus node that represents the focus handle.

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

The optional key for this widget.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

createElement() → Element

Creates an Element to manage this widget's location in the tree.

inherited

createState() → State<StatefulWidget>

Creates the mutable state for this widget at a given location in the tree.

override

getIntrinsicHeight(int width) → int

Computes the intrinsic height of this widget under the given width constraint.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

render(Buffer buffer, Rect area) → void

Renders the widget onto the provided buffer within the specified area.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

of(BuildContext context) → FocusNode?

Finds the nearest ancestor FocusNode in the widget tree.