BarcodeKeyboardListener class

This widget will listen for raw PHYSICAL keyboard events even when other controls have primary focus. It will buffer all characters coming in specifed bufferDuration time frame that end with line feed character and call callback function with result. Keep in mind this widget will listen for events even when not visible. Windows seems to be using the RawKeyDownEvent instead of the RawKeyUpEvent, this behaviour can be managed by setting useKeyDownEvent.

Inheritance

Constructors

BarcodeKeyboardListener({Key? key, required Widget child, required dynamic onBarcodeScanned(String), bool useKeyDownEvent = false, Duration bufferDuration = hundredMs, bool caseSensitive = false})
This widget will listen for raw PHYSICAL keyboard events even when other controls have primary focus. It will buffer all characters coming in specifed bufferDuration time frame that end with line feed character and call callback function with result. Keep in mind this widget will listen for events even when not visible.

Properties

caseSensitive → bool
Make barcode scanner return case sensitive characters
final
child → Widget
Child widget to be displayed.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
useKeyDownEvent → bool
When experiencing issueswith empty barcodes on Windows, set this value to true. Default value is false.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → _BarcodeKeyboardListenerState
Creates the mutable state for this widget at a given location in the tree.
override
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.
inherited
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}) → 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