dom/base/DOMCursor.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "DOMCursor.h"
   8 #include "mozilla/dom/DOMCursorBinding.h"
   9
  10 namespace mozilla {
  11 namespace dom {
  12
  13 NS_IMPL_CYCLE_COLLECTION_INHERITED(DOMCursor, DOMRequest,
  14                                    mCallback)
  15
  16 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(DOMCursor)
  17   NS_INTERFACE_MAP_ENTRY(nsIDOMDOMCursor)
  18 NS_INTERFACE_MAP_END_INHERITING(DOMRequest)
  19
  20 NS_IMPL_ADDREF_INHERITED(DOMCursor, DOMRequest)
  21 NS_IMPL_RELEASE_INHERITED(DOMCursor, DOMRequest)
  22
  23 DOMCursor::DOMCursor(nsPIDOMWindow* aWindow, nsICursorContinueCallback* aCallback)
  24   : DOMRequest(aWindow)
  25   , mCallback(aCallback)
  26   , mFinished(false)
  27 {
  28 }
  29
  30 void
  31 DOMCursor::Reset()
  32 {
  33   MOZ_ASSERT(!mFinished);
  34
  35   // Reset the request state so we can FireSuccess() again.
  36   mResult = JSVAL_VOID;
  37   mDone = false;
  38 }
  39
  40 void
  41 DOMCursor::FireDone()
  42 {
  43   Reset();
  44   mFinished = true;
  45   FireSuccess(JS::UndefinedHandleValue);
  46 }
  47
  48 NS_IMETHODIMP
  49 DOMCursor::GetDone(bool *aDone)
  50 {
  51   *aDone = Done();
  52   return NS_OK;
  53 }
  54
  55 NS_IMETHODIMP
  56 DOMCursor::Continue()
  57 {
  58   ErrorResult rv;
  59   Continue(rv);
  60   return rv.ErrorCode();
  61 }
  62
  63 void
  64 DOMCursor::Continue(ErrorResult& aRv)
  65 {
  66   MOZ_ASSERT(mCallback, "If you're creating your own cursor class with no callback, you should override Continue()");
  67
  68   // We need to have a result here because we must be in a 'success' state.
  69   if (mResult == JSVAL_VOID) {
  70     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
  71     return;
  72   }
  73
  74   Reset();
  75   mCallback->HandleContinue();
  76 }
  77
  78 /* virtual */ JSObject*
  79 DOMCursor::WrapObject(JSContext* aCx)
  80 {
  81   return DOMCursorBinding::Wrap(aCx, this);
  82 }
  83
  84 } // namespace dom
  85 } // namespace mozilla