/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Thomas K. Dyas <tdyas@zecador.org>.
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
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 *
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#include "nsIDOMUIEvent.idl"

/**
 * The nsIDOMSimpleGestureEvent interface is the datatype for all
 * Mozila-specific simple gesture events in the Document Object Model.
 *
 * The following events are generated:
 *
 * MozSwipeGesture - Generated when the user swipes their fingers
 * across the input device.
 *
 * MozMagnifyGestureStart - Generated when the user begins the magnify
 * ("pinch") gesture.  The "delta" value represents the initial
 * movement.
 *
 * MozMagnifyGestureUpdate - Generated periodically while the user is
 * continuing the magnify ("pinch") gesture.  The "delta" value
 * represents the movement since the last MozMagnifyGestureStart or
 * MozMagnifyGestureUpdate event.
 *
 * MozMagnifyGesture - Generated when the user has completed the
 * magnify ("pinch") gesture.  If you only want to receive a single
 * event when the magnify gesture is complete, you only need to hook
 * this event and can safely ignore the MozMagnifyGestureStart and the
 * MozMagnifyGestureUpdate events. The "delta" value is the cumulative
 * amount represented by the user's gesture.
 *
 * MozRotateGestureStart - Generated when the user begins the rotation
 * gesture.  The "delta" value represents the initial rotation.
 *
 * MozRotateGestureUpdate - Generated periodically while the user is
 * continuing the rotation gesture.  The "delta" value represents the
 * rotation since the last MozRotateGestureStart or
 * MozRotateGestureUpdate event.
 *
 * MozRotateGesture - Generated when the user has completed the
 * rotation gesture.  If you only want to receive a single event when
 * the rotation gesture is complete, you only need to hook this event
 * and can safely ignore the MozRotateGestureStart and the
 * MozRotateGestureUpdate events.  The "delta" value is the cumulative
 * amount of rotation represented by the user's gesture.
 */

[scriptable, uuid(20AB8E74-BF9B-4D1D-8A18-B5EE0F3C0A36)]
interface nsIDOMSimpleGestureEvent : nsIDOMUIEvent
{
  /* Direction constants */
  const unsigned long DIRECTION_UP = 1;
  const unsigned long DIRECTION_DOWN = 2;
  const unsigned long DIRECTION_LEFT = 4;
  const unsigned long DIRECTION_RIGHT = 8;
  
  /* Direction of a gesture. Diagonals are indicated by OR'ing the
   * applicable constants together.
   *
   * Swipes gestures may occur in any direction.
   *
   * Magnify gestures do not have a direction.
   *
   * Rotation gestures will be either DIRECTION_LEFT or
   * DIRECTION_RIGHT (i.e., counter-clockwise and clockwise).
   */
  readonly attribute unsigned long direction;

  /* Delta value for magnify and rotate gestures.
   * 
   * For rotation, the value is in degrees and is positive for
   * clockwise rotation and negative for counterclockwise
   * rotation. The "direction" attribute also denotes the direction of
   * the rotation: clockwise is DIRECTION_RIGHT and counterclockwise
   * is DIRECTION_LEFT.
   *
   * For magnification, the value will be positive for a "zoom in"
   * (i.e, increased magnification) and negative for a "zoom out"
   * (i.e., decreased magnification).  The particular units
   * represented by the "delta" are currently implementation specific.
   *
   * XXX - The units for measuring magnification are currently
   * unspecified because the units used by Mac OS X are currently
   * undocumented.  The values are typically in the range of 0.0 to
   * 100.0, but it is only safe currently to rely on the delta being
   * positive or negative.
   */
  readonly attribute double delta;

  /* Modifier keys that may have been pressed during the gesture. */
  readonly attribute boolean altKey;
  readonly attribute boolean ctrlKey;
  readonly attribute boolean shiftKey;
  readonly attribute boolean metaKey;

  void initSimpleGestureEvent(in DOMString typeArg,
                              in boolean canBubbleArg,
                              in boolean cancelableArg,
                              in nsIDOMAbstractView viewArg,
                              in long detailArg,
                              in unsigned long directionArg,
                              in double deltaArg,
                              in boolean altKeyArg,
                              in boolean ctrlKeyArg,
                              in boolean shiftKeyArg,
                              in boolean metaKeyArg);
};