KeyEvent class Null safety

A custom KeyboardEvent that attempts to eliminate cross-browser inconsistencies, and also provide both keyCode and charCode information for all key events (when such information can be determined).

KeyEvent tries to provide a higher level, more polished keyboard event information on top of the "raw" KeyboardEvent.

The mechanics of using KeyEvents is a little different from the underlying KeyboardEvent. To use KeyEvents, you need to create a stream and then add KeyEvents to the stream, rather than using the EventTarget.dispatchEvent. Here's an example usage:

// Initialize a stream for the KeyEvents:
var stream = KeyEvent.keyPressEvent.forTarget(document.body);
// Start listening to the stream of KeyEvents.
stream.listen((keyEvent) =>
    window.console.log('KeyPress event detected ${keyEvent.charCode}'));
...
// Add a new KeyEvent of someone pressing the 'A' key to the stream so
// listeners can know a KeyEvent happened.
stream.add(new KeyEvent('keypress', keyCode: 65, charCode: 97));

This class is very much a work in progress, and we'd love to get information on how we can make this class work with as many international keyboards as possible. Bugs welcome!

Implemented types

KeyboardEvent

Constructors

KeyEvent(String type, {Window? view, bool canBubble: true, bool cancelable: true, int keyCode: 0, int charCode: 0, int location: 1, bool ctrlKey: false, bool altKey: false, bool shiftKey: false, bool metaKey: false, EventTarget? currentTarget}): Programmatically create a new KeyEvent (and KeyboardEvent).
factory
KeyEvent.wrap(KeyboardEvent parent): Construct a KeyEvent with parent as the event we're emulating.

Properties

altKey → bool: Calculated value of whether the alt key is pressed is for this event.
read-only, override
bubbles → bool: read-only, inherited
cancelable → bool: read-only, inherited
charCode → int: Calculated value of what the estimated charCode is for this event.
read-only, override
code → String: read-only, override
composed → bool: read-only, inherited
ctrlKey → bool: True if the ctrl key is pressed during this event.
read-only, override
currentTarget → EventTarget?: The currently registered target for this event.
read-only
defaultPrevented → bool: read-only, inherited
detail → int: read-only, override
eventPhase → int: read-only, inherited
hashCode → int: The hash code for this object. [...]
read-only, inherited
isComposed → bool: read-only
isComposing → bool: read-only, override
isTrusted → bool: read-only, inherited
key → String: read-only, override
keyCode → int: Calculated value of what the estimated keyCode is for this event.
read-only, override
location → int: Accessor to the part of the keyboard that the key was pressed from (one of KeyLocation.STANDARD, KeyLocation.RIGHT, KeyLocation.LEFT, KeyLocation.NUMPAD, KeyLocation.MOBILE, KeyLocation.JOYSTICK).
read-only, override
matchingTarget → Element: A pointer to the element whose CSS selector matched within which an event was fired. If this Event was not associated with any Event delegation, accessing this value will throw an UnsupportedError.
read-only, inherited
metaKey → bool: True if the Meta (or Mac command) key is pressed during this event.
read-only, override
path → List<Node>: This event's path, taking into account shadow DOM. [...]
read-only, inherited
repeat → bool: read-only, override
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited
shiftKey → bool: True if the shift key was pressed during this event.
read-only, override
sourceCapabilities → InputDeviceCapabilities?: read-only, override
target → EventTarget?: read-only, inherited
timeStamp → double: read-only, inherited
type → String: read-only, inherited
view → WindowBase?: read-only, override
which → int: Calculated value of what the estimated keyCode is for this event.
read-only, override
wrapped → Event: final, inherited

Methods

composedPath() → List<EventTarget>: inherited
getModifierState(String keyArgument) → bool: override
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited
preventDefault() → void: inherited
stopImmediatePropagation() → void: inherited
stopPropagation() → void: inherited
toString() → String: Returns a string representation of this object.
inherited

Operators

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

Static Properties

canUseDispatchEvent → bool: read-only
keyDownEvent ↔ EventStreamProvider<KeyEvent>: Accessor to provide a stream of KeyEvents on the desired target.
read / write
keyPressEvent ↔ EventStreamProvider<KeyEvent>: Accessor to provide a stream of KeyEvents on the desired target.
read / write
keyUpEvent ↔ EventStreamProvider<KeyEvent>: Accessor to provide a stream of KeyEvents on the desired target.
read / write

dart:html library