FocusNode class

Represents a focus scope node in the focus tree.

Each FocusNode can receive or relinquish keyboard focus. Use Focus widget to attach a FocusNode to the tree, and FocusScopeNode to create focus boundaries.

Inheritance

Constructors

FocusNode({bool canRequestFocus = true})
Creates a FocusNode with an optional canRequestFocus flag.

Properties

canRequestFocus ↔ bool
Whether this node is allowed to request focus.
getter/setter pair
hasFocus → bool
Whether this node currently has keyboard focus.
no setter
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
onKeyEvent ↔ dynamic Function(KeyEvent)?
An optional callback invoked when a key event reaches this node.
getter/setter pair
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
trapFocus ↔ bool
When true, focus is trapped within this node's subtree.
getter/setter pair

Methods

addListener(dynamic listener()) → void
Register a closure to be called when the object changes.
inherited
dispose() → void
Discards any resources used by the object.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(dynamic listener()) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
requestFocus() → void
Requests keyboard focus for this node.
toString() → String
A string representation of this object.
inherited
unfocus() → void
Removes focus from this node.

Operators

operator ==(Object other) → bool
The equality operator.
inherited