RawKeyboardListener class
A widget that calls a callback whenever the user presses or releases a key on a keyboard.
A RawKeyboardListener is useful for listening to raw 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
- Diagnosticable
- DiagnosticableTree
- Widget
- StatefulWidget
- RawKeyboardListener
Constructors
-
RawKeyboardListener({Key key, @required FocusNode focusNode, @required ValueChanged<
RawKeyEvent> onKey, @required Widget child }) -
Creates a widget that receives raw keyboard events. [...]
const
Properties
- child → Widget
-
The widget below this widget in the tree. [...]
final
- focusNode → FocusNode
-
Controls whether this widget has keyboard focus.
final
-
onKey
→ ValueChanged<
RawKeyEvent> -
Called whenever this widget receives a raw keyboard event.
final
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- key → Key
-
Controls how one widget replaces another widget in the tree. [...]
final, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
createState(
) → _RawKeyboardListenerState -
Creates the mutable state for this widget at a given location in the tree. [...]
override
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node. [...]
override
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children. [...]
@protected, inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent 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 toStringDeep. [...]
inherited
-
toString(
{DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String -
Returns a string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) → 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 ==(
dynamic other) → bool -
The equality operator. [...]
inherited