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
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- KeyboardListener
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
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
override
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited