third_party/WebKit/Source/core/css/resolver/ViewportStyleResolver.h

/*
 * Copyright (C) 2012 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef ViewportStyleResolver_h
#define ViewportStyleResolver_h

#include "core/CSSPropertyNames.h"
#include "core/CoreExport.h"
#include "core/css/RuleSet.h"
#include "platform/Length.h"

namespace blink {

class Document;
class DocumentStyleSheetCollection;
class MutableStylePropertySet;
class StyleRuleViewport;

class CORE_EXPORT ViewportStyleResolver
    : public GarbageCollected<ViewportStyleResolver> {
 public:
  static ViewportStyleResolver* create(Document& document) {
    return new ViewportStyleResolver(document);
  }

  void initialViewportChanged();
  void setNeedsCollectRules();
  bool needsUpdate() const { return m_needsUpdate; }
  void updateViewport(DocumentStyleSheetCollection&);

  void collectViewportRulesFromAuthorSheet(const CSSStyleSheet&);

  DECLARE_TRACE();

 private:
  explicit ViewportStyleResolver(Document&);

  void reset();
  void resolve();

  enum Origin { UserAgentOrigin, AuthorOrigin };
  enum UpdateType { NoUpdate, Resolve, CollectRules };

  void collectViewportRulesFromUASheets();
  void collectViewportChildRules(const HeapVector<Member<StyleRuleBase>>&,
                                 Origin);
  void collectViewportRulesFromImports(StyleSheetContents&);
  void collectViewportRulesFromAuthorSheetContents(StyleSheetContents&);
  void addViewportRule(StyleRuleViewport&, Origin);

  float viewportArgumentValue(CSSPropertyID) const;
  Length viewportLengthValue(CSSPropertyID);

  Member<Document> m_document;
  Member<MutableStylePropertySet> m_propertySet;
  Member<MediaQueryEvaluator> m_initialViewportMedium;
  MediaQueryResultList m_viewportDependentMediaQueryResults;
  MediaQueryResultList m_deviceDependentMediaQueryResults;
  bool m_hasAuthorStyle = false;
  bool m_hasViewportUnits = false;
  UpdateType m_needsUpdate = CollectRules;
};

}  // namespace blink

#endif  // ViewportStyleResolver_h