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

/*
 * Copyright (C) 2012 Apple Inc. 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. OR
 * CONTRIBUTORS 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef PropertySetCSSStyleDeclaration_h
#define PropertySetCSSStyleDeclaration_h

#include "core/css/CSSStyleDeclaration.h"
#include "wtf/HashMap.h"

namespace blink {

class CSSRule;
class CSSValue;
class Element;
class ExceptionState;
class MutableStylePropertySet;
class StyleSheetContents;

class AbstractPropertySetCSSStyleDeclaration : public CSSStyleDeclaration {
 public:
  virtual Element* parentElement() const { return 0; }
  StyleSheetContents* contextStyleSheet() const;

  DECLARE_VIRTUAL_TRACE();

 private:
  CSSRule* parentRule() const override { return 0; }
  unsigned length() const final;
  String item(unsigned index) const final;
  String getPropertyValue(const String& propertyName) final;
  String getPropertyPriority(const String& propertyName) final;
  String getPropertyShorthand(const String& propertyName) final;
  bool isPropertyImplicit(const String& propertyName) final;
  void setProperty(const String& propertyName,
                   const String& value,
                   const String& priority,
                   ExceptionState&) final;
  String removeProperty(const String& propertyName, ExceptionState&) final;
  String cssFloat() const;
  void setCSSFloat(const String&, ExceptionState&);
  String cssText() const final;
  void setCSSText(const String&, ExceptionState&) final;
  const CSSValue* getPropertyCSSValueInternal(CSSPropertyID) final;
  const CSSValue* getPropertyCSSValueInternal(
      AtomicString customPropertyName) final;
  String getPropertyValueInternal(CSSPropertyID) final;
  void setPropertyInternal(CSSPropertyID,
                           const String& customPropertyName,
                           const String& value,
                           bool important,
                           ExceptionState&) final;

  bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const final;

 protected:
  enum MutationType { NoChanges, PropertyChanged };
  virtual void willMutate() {}
  virtual void didMutate(MutationType) {}
  virtual MutableStylePropertySet& propertySet() const = 0;
  virtual bool isKeyframeStyle() const { return false; }
};

class PropertySetCSSStyleDeclaration
    : public AbstractPropertySetCSSStyleDeclaration {
 public:
  PropertySetCSSStyleDeclaration(MutableStylePropertySet& propertySet)
      : m_propertySet(&propertySet) {}

  DECLARE_VIRTUAL_TRACE();

 protected:
  MutableStylePropertySet& propertySet() const final {
    ASSERT(m_propertySet);
    return *m_propertySet;
  }

  Member<MutableStylePropertySet> m_propertySet;  // Cannot be null
};

class StyleRuleCSSStyleDeclaration : public PropertySetCSSStyleDeclaration {
 public:
  static StyleRuleCSSStyleDeclaration* create(
      MutableStylePropertySet& propertySet,
      CSSRule* parentRule) {
    return new StyleRuleCSSStyleDeclaration(propertySet, parentRule);
  }

  void reattach(MutableStylePropertySet&);

  DECLARE_VIRTUAL_TRACE();

 protected:
  StyleRuleCSSStyleDeclaration(MutableStylePropertySet&, CSSRule*);
  ~StyleRuleCSSStyleDeclaration() override;

  CSSStyleSheet* parentStyleSheet() const override;

  CSSRule* parentRule() const override { return m_parentRule; }

  void willMutate() override;
  void didMutate(MutationType) override;

  Member<CSSRule> m_parentRule;
};

class InlineCSSStyleDeclaration final
    : public AbstractPropertySetCSSStyleDeclaration {
 public:
  explicit InlineCSSStyleDeclaration(Element* parentElement)
      : m_parentElement(parentElement) {}

  DECLARE_VIRTUAL_TRACE();

 private:
  MutableStylePropertySet& propertySet() const override;
  CSSStyleSheet* parentStyleSheet() const override;
  Element* parentElement() const override { return m_parentElement; }

  void didMutate(MutationType) override;

  Member<Element> m_parentElement;
};

}  // namespace blink

#endif