// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

part of $LIBRARYNAME;

$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {

  factory WheelEvent(String type,
      {Window view, num deltaX: 0, num deltaY: 0, num deltaZ: 0,
      int deltaMode: 0,
      int detail: 0, int screenX: 0, int screenY: 0, int clientX: 0,
      int clientY: 0, int button: 0, bool canBubble: true,
      bool cancelable: true, bool ctrlKey: false, bool altKey: false,
      bool shiftKey: false, bool metaKey: false, EventTarget relatedTarget}) {

    var options = {
      'view': view,
      'deltaMode': deltaMode,
      'deltaX': deltaX,
      'deltaY': deltaY,
      'deltaZ': deltaZ,
      'detail': detail,
      'screenX': screenX,
      'screenY': screenY,
      'clientX': clientX,
      'clientY': clientY,
      'button': button,
      'bubbles': canBubble,
      'cancelable': cancelable,
      'ctrlKey': ctrlKey,
      'altKey': altKey,
      'shiftKey': shiftKey,
      'metaKey': metaKey,
      'relatedTarget': relatedTarget,
    };

$if DART2JS
    if (view == null) {
      view = window;
    }

    return JS('WheelEvent', 'new WheelEvent(#, #)',
        type, convertDartToNative_Dictionary(options));

$else
    return _blink.BlinkWheelEvent.instance.constructorCallback_2_(type, convertDartToNative_Dictionary(options));
$endif
  }

$!MEMBERS

$if DART2JS
  /**
   * The amount that is expected to scroll vertically, in units determined by
   * [deltaMode].
   *
   * See also:
   *
   * * [WheelEvent.deltaY](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaY) from the W3C.
   */
  @DomName('WheelEvent.deltaY')
  num get deltaY {
    if (JS('bool', '#.deltaY !== undefined', this)) {
      // W3C WheelEvent
      return this._deltaY;
    }
    throw new UnsupportedError(
        'deltaY is not supported');
  }

  /**
   * The amount that is expected to scroll horizontally, in units determined by
   * [deltaMode].
   *
   * See also:
   *
   * * [WheelEvent.deltaX](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaX) from the W3C.
   */
  @DomName('WheelEvent.deltaX')
  num get deltaX {
    if (JS('bool', '#.deltaX !== undefined', this)) {
      // W3C WheelEvent
      return this._deltaX;
    }
    throw new UnsupportedError(
        'deltaX is not supported');
  }

  @DomName('WheelEvent.deltaMode')
  int get deltaMode {
    if (JS('bool', '!!(#.deltaMode)', this)) {
      return JS('int', '#.deltaMode', this);
    }
    // If not available then we're poly-filling and doing pixel scroll.
    return 0;
  }

  num get _wheelDelta => JS('num', '#.wheelDelta', this);
  num get _wheelDeltaX => JS('num', '#.wheelDeltaX', this);
  num get _detail => JS('num', '#.detail', this);

  bool get _hasInitMouseScrollEvent =>
      JS('bool', '!!(#.initMouseScrollEvent)', this);

  @JSName('initMouseScrollEvent')
  void _initMouseScrollEvent(
      String type,
      bool canBubble,
      bool cancelable,
      Window view,
      int detail,
      int screenX,
      int screenY,
      int clientX,
      int clientY,
      bool ctrlKey,
      bool altKey,
      bool shiftKey,
      bool metaKey,
      int button,
      EventTarget relatedTarget,
      int axis) native;

  bool get _hasInitWheelEvent =>
      JS('bool', '!!(#.initWheelEvent)', this);
  @JSName('initWheelEvent')
  void _initWheelEvent(
      String eventType,
      bool canBubble,
      bool cancelable,
      Window view,
      int detail,
      int screenX,
      int screenY,
      int clientX,
      int clientY,
      int button,
      EventTarget relatedTarget,
      String modifiersList,
      int deltaX,
      int deltaY,
      int deltaZ,
      int deltaMode) native;

$else
  /**
   * The amount that is expected to scroll horizontally, in units determined by
   * [deltaMode].
   *
   * See also:
   *
   * * [WheelEvent.deltaX](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaX) from the W3C.
   */
  @DomName('WheelEvent.deltaX')
  num get deltaX => _deltaX;

  /**
   * The amount that is expected to scroll vertically, in units determined by
   * [deltaMode].
   *
   * See also:
   *
   * * [WheelEvent.deltaY](http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#events-WheelEvent-deltaY) from the W3C.
   */
  @DomName('WheelEvent.deltaY')
  num get deltaY => _deltaY;
$endif
}