KeyboardListener class

A widget that calls a callback whenever the user presses or releases a key on a keyboard.

A KeyboardListener is useful for listening to key events and hardware buttons that are represented as keys. Typically used by games and other apps that use keyboards for purposes other than text entry.

For text entry, consider using a EditableText, which integrates with on-screen keyboards and input method editors (IMEs).

See also:

  • EditableText, which should be used instead of this widget for text entry.
Inheritance

Constructors

KeyboardListener({Key? key, required FocusNode focusNode, bool autofocus = false, bool includeSemantics = true, ValueChanged<KeyEvent>? onKeyEvent, required Widget child})
Creates a widget that receives keyboard events.
const

Properties

autofocus → bool
True if this widget will be selected as the initial focus when no other node in its scope is currently focused.
final
child → Widget
The widget below this widget in the tree.
final
focusNode → FocusNode
Controls whether this widget has keyboard focus.
final
hashCode → int
The hash code for this object.
no setterinherited
includeSemantics → bool
Include semantics information in this widget.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onKeyEvent → ValueChanged<KeyEvent>?
Called whenever this widget receives a keyboard event.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited