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nsHTMLImageAccessible.h

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 *   Author: Aaron Leventhal (aaronl@netscape.com)
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#ifndef _nsHTMLImageAccessible_H_
#define _nsHTMLImageAccessible_H_

#include "nsBaseWidgetAccessible.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsIAccessibleImage.h"

/* Accessible for supporting images
 * supports:
 * - gets name, role
 * - support basic state
 */
class nsHTMLImageAccessible : public nsLinkableAccessible,
                              public nsIAccessibleImage
{

  NS_DECL_ISUPPORTS_INHERITED

public:
  //action0 may exist depends on whether an onclick is associated with it
  enum { eAction_ShowLongDescription = 1 };

  nsHTMLImageAccessible(nsIDOMNode* aDomNode, nsIWeakReference* aShell);

  // nsIAccessible
  NS_IMETHOD GetName(nsAString& _retval); 
  NS_IMETHOD GetState(PRUint32 *aState, PRUint32 *aExtraState);
  NS_IMETHOD GetRole(PRUint32 *_retval);
  NS_IMETHOD DoAction(PRUint8 index);

  // nsIAccessibleHyperLink
  NS_IMETHOD GetAnchorCount(PRInt32 *aAnchorCount);
  NS_IMETHOD GetURI(PRInt32 aIndex, nsIURI **aURI);
  NS_IMETHOD GetAnchor(PRInt32 aIndex, nsIAccessible **aAccessible);

  // nsPIAccessNode
  NS_IMETHOD Shutdown();

  // nsIAccessibleImage
  NS_DECL_NSIACCESSIBLEIMAGE

  // nsAccessible
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);

protected:
  // nsAccessible
  virtual void CacheChildren();

  already_AddRefed<nsIDOMHTMLCollection> GetAreaCollection();
  already_AddRefed<nsIAccessible>
    GetAreaAccessible(nsIDOMHTMLCollection* aAreaNodes, PRInt32 aAreaNum);

  // Reference on linked map element if any.
  nsCOMPtr<nsIDOMHTMLMapElement> mMapElement;

  // Cache of area accessibles. We do not use common cache because images can
  // share area elements but we need to have separate area accessibles for
  // each image accessible.
  nsAccessNodeHashtable *mAccessNodeCache;
};

#endif


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