third_party/WebKit/Source/core/css/StyleRuleImport.h

/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2002, 2006, 2008, 2012 Apple 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.
 */

#ifndef StyleRuleImport_h
#define StyleRuleImport_h

#include "core/css/StyleRule.h"
#include "core/loader/resource/StyleSheetResourceClient.h"
#include "platform/heap/Handle.h"

namespace blink {

class CSSStyleSheetResource;
class MediaQuerySet;
class StyleSheetContents;

class StyleRuleImport : public StyleRuleBase {
  USING_PRE_FINALIZER(StyleRuleImport, dispose);

 public:
  static StyleRuleImport* create(const String& href, MediaQuerySet*);

  ~StyleRuleImport();

  StyleSheetContents* parentStyleSheet() const { return m_parentStyleSheet; }
  void setParentStyleSheet(StyleSheetContents* sheet) {
    ASSERT(sheet);
    m_parentStyleSheet = sheet;
  }
  void clearParentStyleSheet() { m_parentStyleSheet = nullptr; }

  String href() const { return m_strHref; }
  StyleSheetContents* styleSheet() const { return m_styleSheet.get(); }

  bool isLoading() const;
  MediaQuerySet* mediaQueries() { return m_mediaQueries.get(); }

  void requestStyleSheet();

  DECLARE_TRACE_AFTER_DISPATCH();

 private:
  // FIXME: inherit from StyleSheetResourceClient directly to eliminate back
  // pointer, as there are no space savings in this.
  // NOTE: We put the StyleSheetResourceClient in a member instead of inheriting
  // from it to avoid adding a vptr to StyleRuleImport.
  class ImportedStyleSheetClient final
      : public GarbageCollectedFinalized<ImportedStyleSheetClient>,
        public StyleSheetResourceClient {
    USING_GARBAGE_COLLECTED_MIXIN(ImportedStyleSheetClient);

   public:
    ImportedStyleSheetClient(StyleRuleImport* ownerRule)
        : m_ownerRule(ownerRule) {}
    ~ImportedStyleSheetClient() override {}
    void setCSSStyleSheet(const String& href,
                          const KURL& baseURL,
                          const String& charset,
                          const CSSStyleSheetResource* sheet) override {
      m_ownerRule->setCSSStyleSheet(href, baseURL, charset, sheet);
    }
    String debugName() const override { return "ImportedStyleSheetClient"; }

    DEFINE_INLINE_TRACE() {
      visitor->trace(m_ownerRule);
      StyleSheetResourceClient::trace(visitor);
    }

   private:
    Member<StyleRuleImport> m_ownerRule;
  };

  void setCSSStyleSheet(const String& href,
                        const KURL& baseURL,
                        const String& charset,
                        const CSSStyleSheetResource*);

  StyleRuleImport(const String& href, MediaQuerySet*);

  void dispose();

  Member<StyleSheetContents> m_parentStyleSheet;

  Member<ImportedStyleSheetClient> m_styleSheetClient;
  String m_strHref;
  Member<MediaQuerySet> m_mediaQueries;
  Member<StyleSheetContents> m_styleSheet;
  Member<CSSStyleSheetResource> m_resource;
  bool m_loading;
};

DEFINE_STYLE_RULE_TYPE_CASTS(Import);

}  // namespace blink

#endif