gecko/content/base/public/Element.h

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 * The Original Code is mozilla.org code.
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 * Contributor(s):
 *   Boris Zbarsky <bzbarsky@mit.edu> (Original Author)
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#ifndef mozilla_dom_Element_h__
#define mozilla_dom_Element_h__

#include "nsIContent.h"

// Element-specific flags
enum {
  // Set if the element has a pending style change.
  ELEMENT_HAS_PENDING_RESTYLE     = (1 << NODE_TYPE_SPECIFIC_BITS_OFFSET),

  // Set if the element is a potential restyle root (that is, has a style
  // change pending _and_ that style change will attempt to restyle
  // descendants).
  ELEMENT_IS_POTENTIAL_RESTYLE_ROOT =
    (1 << (NODE_TYPE_SPECIFIC_BITS_OFFSET + 1)),

  // Set if the element has a pending animation style change.
  ELEMENT_HAS_PENDING_ANIMATION_RESTYLE =
    (1 << (NODE_TYPE_SPECIFIC_BITS_OFFSET + 2)),

  // Set if the element is a potential animation restyle root (that is,
  // has an animation style change pending _and_ that style change
  // will attempt to restyle descendants).
  ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT =
    (1 << (NODE_TYPE_SPECIFIC_BITS_OFFSET + 3)),

  // All of those bits together, for convenience.
  ELEMENT_ALL_RESTYLE_FLAGS = ELEMENT_HAS_PENDING_RESTYLE |
                              ELEMENT_IS_POTENTIAL_RESTYLE_ROOT |
                              ELEMENT_HAS_PENDING_ANIMATION_RESTYLE |
                              ELEMENT_IS_POTENTIAL_ANIMATION_RESTYLE_ROOT,

  // Just the HAS_PENDING bits, for convenience
  ELEMENT_PENDING_RESTYLE_FLAGS = ELEMENT_HAS_PENDING_RESTYLE |
                                  ELEMENT_HAS_PENDING_ANIMATION_RESTYLE,

  // Remaining bits are for subclasses
  ELEMENT_TYPE_SPECIFIC_BITS_OFFSET = NODE_TYPE_SPECIFIC_BITS_OFFSET + 4
};

namespace mozilla {
namespace dom {

class Element : public nsIContent
{
public:
#ifdef MOZILLA_INTERNAL_API
  Element(already_AddRefed<nsINodeInfo> aNodeInfo) : nsIContent(aNodeInfo) {}
#endif // MOZILLA_INTERNAL_API
};

} // namespace dom
} // namespace mozilla

inline mozilla::dom::Element* nsINode::AsElement() {
  NS_ASSERTION(IsElement(), "Not an element?");
  return static_cast<mozilla::dom::Element*>(this);
}

#endif // mozilla_dom_Element_h__