third_party/WebKit/Source/core/dom/ShadowTreeStyleSheetCollection.cpp

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
 * rights reserved.
 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
 * (http://www.torchmobile.com/)
 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "core/dom/ShadowTreeStyleSheetCollection.h"

#include "core/HTMLNames.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Element.h"
#include "core/dom/StyleChangeReason.h"
#include "core/dom/StyleEngine.h"
#include "core/dom/StyleSheetCandidate.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLStyleElement.h"

namespace blink {

using namespace HTMLNames;

ShadowTreeStyleSheetCollection::ShadowTreeStyleSheetCollection(
    ShadowRoot& shadowRoot)
    : TreeScopeStyleSheetCollection(shadowRoot) {}

void ShadowTreeStyleSheetCollection::collectStyleSheets(
    StyleEngine& engine,
    StyleSheetCollection& collection) {
  for (Node* n : m_styleSheetCandidateNodes) {
    StyleSheetCandidate candidate(*n);
    DCHECK(!candidate.isXSL());

    StyleSheet* sheet = candidate.sheet();
    if (!sheet)
      continue;

    collection.appendSheetForList(sheet);
    if (candidate.canBeActivated(nullAtom))
      collection.appendActiveStyleSheet(toCSSStyleSheet(sheet));
  }
}

void ShadowTreeStyleSheetCollection::updateActiveStyleSheets(
    StyleEngine& engine,
    StyleResolverUpdateMode updateMode) {
  // StyleSheetCollection is GarbageCollected<>, allocate it on the heap.
  StyleSheetCollection* collection = StyleSheetCollection::create();
  collectStyleSheets(engine, *collection);

  StyleSheetChange change;
  analyzeStyleSheetChange(updateMode, collection->activeAuthorStyleSheets(),
                          change);

  if (StyleResolver* styleResolver = engine.resolver()) {
    if (change.styleResolverUpdateType != Additive) {
      // We should not destroy StyleResolver when we find any stylesheet update
      // in a shadow tree.  In this case, we will reset rulesets created from
      // style elements in the shadow tree.
      styleResolver->resetAuthorStyle(treeScope());
      styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
      styleResolver->lazyAppendAuthorStyleSheets(
          0, collection->activeAuthorStyleSheets());
    } else {
      styleResolver->lazyAppendAuthorStyleSheets(
          m_activeAuthorStyleSheets.size(),
          collection->activeAuthorStyleSheets());
    }
  }
  if (change.requiresFullStyleRecalc)
    toShadowRoot(treeScope().rootNode())
        .host()
        .setNeedsStyleRecalc(SubtreeStyleChange,
                             StyleChangeReasonForTracing::create(
                                 StyleChangeReason::ActiveStylesheetsUpdate));

  collection->swap(*this);
  collection->dispose();
}

}  // namespace blink