/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

webidl BrowsingContext;

interface nsIDragService;

/**
 * A driver for MockDragService, so that tests can mock system DND behavior.
 * (System DND is not permitted in tests.)
 */
[scriptable, builtinclass, uuid(32037ab0-bfc7-11ee-9f4b-09901bed55fa)]
interface nsIMockDragServiceController : nsISupports
{
  // Types of event that can be sent by this controller.
  cenum EventType : 8 {
    eDragEnter = 0,
    eDragOver = 1,
    eDragExit = 2,
    eDrop = 3,
    eMouseDown = 4,
    eMouseMove = 5,
    eMouseUp = 6,
  };

  /**
   * The nsIDragService that this controller targets.  It is a mock version
   * of the normal nsIDragService.  The caller must replace the drag
   * service in the service manager with this object before sending
   * drag events to it.  This can be done with MockRegistrar or by calling
   * the nsComponentManager directly.
   */
  readonly attribute nsIDragService mockDragService;

  /**
   * Issue the given event from our mock drag service, as if that type
   * of event came from the system.  The mock object attempts to mimic the
   * essential behavior of the native drag classes for this.
   *
   * @param aBC            A BrowsingContext in the widget the event is
   *                       targetted at
   * @param aEventType     Type of event to send
   * @param aScreenX       Screen X coordinate of event
   * @param aScreenY       Screen Y coordinate of event
   * @param aKeyModifiers  Keys that are pressed during event.
   *                       NOTE: Keys should be interpreted as selecting
   *                       the drag action, but that logic is very
   *                       platform-dependent and is not yet mocked.
   *                       Drops will be processed as "moves".
   */
  [can_run_script]
  void sendEvent(in BrowsingContext aBC,
                 in nsIMockDragServiceController_EventType aEventType,
                 in long aScreenX, in long aScreenY,
                 [optional] in uint32_t aKeyModifiers);

  /**
   * Windows' IDropTarget has the ability to "Cancel" a drag that is
   * different than dragleave.  This emulates that behavior for testing.
   */
  [can_run_script]
  void cancelDrag([optional] in uint32_t aKeyModifiers);
};