gecko-dev/layout/style/MediaList.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

/* base class for representation of media lists */

#include "mozilla/dom/MediaList.h"

#include "mozAutoDocUpdate.h"
#include "mozilla/dom/MediaListBinding.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/StyleSheetInlines.h"

namespace mozilla {
namespace dom {

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaList)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaList)

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(MediaList)

JSObject*
MediaList::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return MediaListBinding::Wrap(aCx, this, aGivenProto);
}

void
MediaList::SetStyleSheet(StyleSheet* aSheet)
{
  MOZ_ASSERT(aSheet == mStyleSheet || !aSheet || !mStyleSheet,
             "Multiple style sheets competing for one media list");
  mStyleSheet = aSheet;
}

template<typename Func>
nsresult
MediaList::DoMediaChange(Func aCallback)
{
  if (mStyleSheet) {
    mStyleSheet->WillDirty();
  }

  nsresult rv = aCallback();
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (mStyleSheet) {
    // FIXME(emilio): We should discern between "owned by a rule" (as in @media)
    // and "owned by a sheet" (as in <style media>), and then pass something
    // meaningful here.
    mStyleSheet->RuleChanged(nullptr);
  }

  return rv;
}

already_AddRefed<MediaList>
MediaList::Clone()
{
  RefPtr<MediaList> clone =
    new MediaList(Servo_MediaList_DeepClone(mRawList).Consume());
  return clone.forget();
}

MediaList::MediaList()
  : mRawList(Servo_MediaList_Create().Consume())
{
}

MediaList::MediaList(const nsAString& aMedia, CallerType aCallerType)
  : MediaList()
{
  SetTextInternal(aMedia, aCallerType);
}

void
MediaList::GetText(nsAString& aMediaText)
{
  Servo_MediaList_GetText(mRawList, &aMediaText);
}

/* static */ already_AddRefed<MediaList>
MediaList::Create(const nsAString& aMedia, CallerType aCallerType)
{
  RefPtr<MediaList> mediaList = new MediaList(aMedia, aCallerType);
  return mediaList.forget();
}

void
MediaList::SetText(const nsAString& aMediaText)
{
  SetTextInternal(aMediaText, CallerType::NonSystem);
}

void
MediaList::GetMediaText(nsAString& aMediaText)
{
  GetText(aMediaText);
}

void
MediaList::SetTextInternal(const nsAString& aMediaText, CallerType aCallerType)
{
  NS_ConvertUTF16toUTF8 mediaText(aMediaText);
  Servo_MediaList_SetText(mRawList, &mediaText, aCallerType);
}

uint32_t
MediaList::Length()
{
  return Servo_MediaList_GetLength(mRawList);
}

void
MediaList::IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aReturn)
{
  aFound = Servo_MediaList_GetMediumAt(mRawList, aIndex, &aReturn);
  if (!aFound) {
    SetDOMStringToNull(aReturn);
  }
}

nsresult
MediaList::Delete(const nsAString& aOldMedium)
{
  NS_ConvertUTF16toUTF8 oldMedium(aOldMedium);
  if (Servo_MediaList_DeleteMedium(mRawList, &oldMedium)) {
    return NS_OK;
  }
  return NS_ERROR_DOM_NOT_FOUND_ERR;
}

bool
MediaList::Matches(nsPresContext* aPresContext) const
{
  const RawServoStyleSet* rawSet =
    aPresContext->StyleSet()->RawSet();
  MOZ_ASSERT(rawSet, "The RawServoStyleSet should be valid!");
  return Servo_MediaList_Matches(mRawList, rawSet);
}

nsresult
MediaList::Append(const nsAString& aNewMedium)
{
  if (aNewMedium.IsEmpty()) {
    return NS_ERROR_DOM_NOT_FOUND_ERR;
  }
  NS_ConvertUTF16toUTF8 newMedium(aNewMedium);
  Servo_MediaList_AppendMedium(mRawList, &newMedium);
  return NS_OK;
}

void
MediaList::SetMediaText(const nsAString& aMediaText)
{
  DoMediaChange([&]() {
    SetText(aMediaText);
    return NS_OK;
  });
}

void
MediaList::Item(uint32_t aIndex, nsAString& aReturn)
{
  bool dummy;
  IndexedGetter(aIndex, dummy, aReturn);
}

void
MediaList::DeleteMedium(const nsAString& aOldMedium, ErrorResult& aRv)
{
  aRv = DoMediaChange([&]() { return Delete(aOldMedium); });
}

void
MediaList::AppendMedium(const nsAString& aNewMedium, ErrorResult& aRv)
{
  aRv = DoMediaChange([&]() { return Append(aNewMedium); });
}

} // namespace dom
} // namespace mozilla