Make KeyboardEvent cross-browser consistent.

sdk/lib/html/src/dartium_KeyEvent.dart

+/**
+ * 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).
+ *
+ * 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!
+ */
+class KeyEvent 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;
+
+  /** Construct a KeyEvent with [parent] as event we're emulating. */
+  KeyEvent(KeyboardEvent parent) {
+    _parent = parent;
+    _shadowAltKey = _realAltKey;
+    _shadowCharCode = _realCharCode;
+    _shadowKeyCode = _realKeyCode;
+  }
+ 
+  /** True if the altGraphKey is pressed during this event. */
+  bool get altGraphKey => _parent.altGraphKey;
+  bool get bubbles => _parent.bubbles;
+  /** True if this event can be cancelled. */
+  bool get cancelable => _parent.cancelable;
+  bool get cancelBubble => _parent.cancelBubble;
+  set cancelBubble(bool cancel) => _parent = cancel;
+  /** Accessor to the clipboardData available for this event. */
+  Clipboard get clipboardData => _parent.clipboardData;
+  /** True if the ctrl key is pressed during this event. */
+  bool get ctrlKey => _parent.ctrlKey;
+  /** Accessor to the target this event is listening to for changes. */
+  EventTarget get currentTarget => _parent.currentTarget;
+  bool get defaultPrevented => _parent.defaultPrevented;
+  int get detail => _parent.detail;
+  int get eventPhase => _parent.eventPhase;
+  /**
+   * 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;
+  int get layerX => _parent.layerX;
+  int get layerY => _parent.layerY;
+  /** True if the Meta (or Mac command) key is pressed during this event. */
+  bool get metaKey => _parent.metaKey;
+  int get pageX => _parent.pageX;
+  int get pageY => _parent.pageY;
+  bool get returnValue => _parent.returnValue;
+  set returnValue(bool value) => _parent = value;
+  /** True if the shift key was pressed during this event. */
+  bool get shiftKey => _parent.shiftKey;
+  int get timeStamp => _parent.timeStamp;
+  /**
+   * The type of key event that occurred. One of "keydown", "keyup", or
+   * "keypress".
+   */
+  String get type => _parent.type;
+  Window get view => _parent.view;
+  void preventDefault() => _parent.preventDefault();
+  void stopImmediatePropagation() => _parent.stopImmediatePropagation();
+  void stopPropagation() => _parent.stopPropagation();
+  void $dom_initUIEvent(String type, bool canBubble, bool cancelable,
+      LocalWindow view, int detail) {
+    throw new UnsupportedError("Cannot initialize a UI Event from a KeyEvent.");
+  }
+  void $dom_initEvent(String eventTypeArg, bool canBubbleArg,
+      bool cancelableArg) {
+    throw new UnsupportedError("Cannot initialize an Event from a KeyEvent.");
+  }
+  String get _shadowKeyIdentifier => _parent.$dom_keyIdentifier;
+}