| /** |
| * 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]. |
| * |
| * 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! |
| */ |
| part of html; |
| |
| @Experimental() |
| class KeyEvent extends _WrappedEvent implements KeyboardEvent { |
| /** The parent KeyboardEvent that this KeyEvent is wrapping and "fixing". */ |
| KeyboardEvent _parent; |
| |
| /** The "fixed" value of whether the alt key is being pressed. */ |
| bool _shadowAltKey; |
| |
| /** Caculated value of what the estimated charCode is for this event. */ |
| int _shadowCharCode; |
| |
| /** Caculated value of what the estimated keyCode is for this event. */ |
| int _shadowKeyCode; |
| |
| /** Caculated value of what the estimated keyCode is for this event. */ |
| int get keyCode => _shadowKeyCode; |
| |
| /** Caculated value of what the estimated charCode is for this event. */ |
| int get charCode => this.type == 'keypress' ? _shadowCharCode : 0; |
| |
| /** Caculated value of whether the alt key is pressed is for this event. */ |
| bool get altKey => _shadowAltKey; |
| |
| /** Caculated value of what the estimated keyCode is for this event. */ |
| int get which => keyCode; |
| |
| /** Accessor to the underlying keyCode value is the parent event. */ |
| int get _realKeyCode => _parent.keyCode; |
| |
| /** Accessor to the underlying charCode value is the parent event. */ |
| int get _realCharCode => _parent.charCode; |
| |
| /** Accessor to the underlying altKey value is the parent event. */ |
| bool get _realAltKey => _parent.altKey; |
| |
| /** Shadows on top of the parent's currentTarget. */ |
| EventTarget _currentTarget; |
| |
| /** Construct a KeyEvent with [parent] as the event we're emulating. */ |
| KeyEvent.wrap(KeyboardEvent parent): super(parent) { |
| _parent = parent; |
| _shadowAltKey = _realAltKey; |
| _shadowCharCode = _realCharCode; |
| _shadowKeyCode = _realKeyCode; |
| _currentTarget = _parent.currentTarget == null? window : |
| _parent.currentTarget; |
| } |
| |
| /** Programmatically create a new KeyEvent (and KeyboardEvent). */ |
| factory KeyEvent(String type, |
| {Window view, bool canBubble: true, bool cancelable: true, int keyCode: 0, |
| int charCode: 0, int keyLocation: 1, bool ctrlKey: false, |
| bool altKey: false, bool shiftKey: false, bool metaKey: false, |
| bool altGraphKey: false, EventTarget currentTarget}) { |
| var parent = new KeyboardEvent(type, view: view, canBubble: canBubble, |
| cancelable: cancelable, keyLocation: keyLocation, ctrlKey: ctrlKey, |
| altKey: altKey, shiftKey: shiftKey, metaKey: metaKey, altGraphKey: |
| altGraphKey); |
| var keyEvent = new KeyEvent.wrap(parent); |
| keyEvent._shadowAltKey = altKey; |
| keyEvent._shadowCharCode = charCode; |
| keyEvent._shadowKeyCode = keyCode; |
| keyEvent._currentTarget = currentTarget == null ? window : currentTarget; |
| return keyEvent; |
| } |
| |
| /** Accessor to provide a stream of KeyEvents on the desired target. */ |
| static EventStreamProvider<KeyEvent> keyDownEvent = |
| new _KeyboardEventHandler('keydown'); |
| /** Accessor to provide a stream of KeyEvents on the desired target. */ |
| static EventStreamProvider<KeyEvent> keyUpEvent = |
| new _KeyboardEventHandler('keyup'); |
| /** Accessor to provide a stream of KeyEvents on the desired target. */ |
| static EventStreamProvider<KeyEvent> keyPressEvent = |
| new _KeyboardEventHandler('keypress'); |
| |
| /** The currently registered target for this event. */ |
| EventTarget get currentTarget => _currentTarget; |
| |
| /** True if the altGraphKey is pressed during this event. */ |
| bool get altGraphKey => _parent.altGraphKey; |
| /** Accessor to the clipboardData available for this event. */ |
| DataTransfer get clipboardData => _parent.clipboardData; |
| /** True if the ctrl key is pressed during this event. */ |
| bool get ctrlKey => _parent.ctrlKey; |
| int get detail => _parent.detail; |
| /** |
| * 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). |
| */ |
| int get keyLocation => _parent.keyLocation; |
| Point get layer => _parent.layer; |
| /** True if the Meta (or Mac command) key is pressed during this event. */ |
| bool get metaKey => _parent.metaKey; |
| Point get page => _parent.page; |
| /** True if the shift key was pressed during this event. */ |
| bool get shiftKey => _parent.shiftKey; |
| Window get view => _parent.view; |
| void _initUIEvent(String type, bool canBubble, bool cancelable, |
| Window view, int detail) { |
| throw new UnsupportedError("Cannot initialize a UI Event from a KeyEvent."); |
| } |
| String get _shadowKeyIdentifier => _parent._keyIdentifier; |
| |
| int get _charCode => charCode; |
| int get _keyCode => keyCode; |
| String get _keyIdentifier { |
| throw new UnsupportedError("keyIdentifier is unsupported."); |
| } |
| void _initKeyboardEvent(String type, bool canBubble, bool cancelable, |
| Window view, String keyIdentifier, int keyLocation, bool ctrlKey, |
| bool altKey, bool shiftKey, bool metaKey, |
| bool altGraphKey) { |
| throw new UnsupportedError( |
| "Cannot initialize a KeyboardEvent from a KeyEvent."); |
| } |
| } |