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nsARIAMap.h

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#ifndef _nsARIAMap_H_
#define _nsARIAMap_H_

#include "prtypes.h"
#include "nsAccessibilityAtoms.h"

// Name mapping rule: can the name be computed from descendants?
enum ENameRule
{
  // eNameLabelOrTitle:
  // Collect name from:
  //   1) The content subtrees pointed to by labelledby
  //      which contains the IDs for the label content, or if unspecified
  //   2) The title attribute if specified
  eNameLabelOrTitle,
  
  // eNameOkFromChildren
  // Collect name from:
  //   1) The content subtrees pointed to by labelledby
  //      which contains the IDs for the label content, or if un specified
  //   2) The text and text equivalents from descendents,
  //      as well as the value of controls, collected in depth-first order, or if empty
  //   3) The title attribute if specified
  eNameOkFromChildren
};

// Is nsIAccessible value supported for this role or not?
enum EValueRule
{
  eNoValue,
  eHasValueMinMax    // Supports value, min and max from aria-valuenow, aria-valuemin and aria-valuemax
};

// Used for an nsStateMapEntry if a given state attribute supports "true" and "false"
#define kBoolState 0

// Used in nsRoleMapEntry.state if no nsIAccessibleStates are automatic for a given role
#define kNoReqStates 0

// For this name and value pair, what is the nsIAccessibleStates mapping.
// nsStateMapEntry.state
struct nsStateMapEntry
{
  nsIAtom** attributeName;  // nsnull indicates last entry in map
  const char* attributeValue; // magic value of kBoolState (0) means supports "true" and "false"
  PRUint32 state;             // If match, this is the nsIAccessibleStates to map to
};

// For each ARIA role, this maps the nsIAccessible information
struct nsRoleMapEntry
{
  // ARIA role: string representation such as "button"
  const char *roleString;
  
  // Role mapping rule: maps to this nsIAccessibleRole
  PRUint32 role;
  
  // Name mapping rule: how to compute nsIAccessible name
  ENameRule nameRule;
  
  // Value mapping rule: how to compute nsIAccessible value
  EValueRule valueRule;
  
  // Automatic state mapping rule: always include in nsIAccessibleStates
  PRUint32 state;   // or kNoReqStates if no nsIAccessibleStates are automatic for this role.
  
  // ARIA properties supported for this role
  // (in other words, the aria-foo attribute to nsIAccessibleStates mapping rules)
  // Currently you cannot have unlimited mappings, because
  // a variable sized array would not allow the use of
  // C++'s struct initialization feature.
  nsStateMapEntry attributeMap1;
  nsStateMapEntry attributeMap2;
  nsStateMapEntry attributeMap3;
  nsStateMapEntry attributeMap4;
  nsStateMapEntry attributeMap5;
  nsStateMapEntry attributeMap6;
  nsStateMapEntry attributeMap7;
  nsStateMapEntry attributeMap8;
};

/**
 *  These are currently initialized (hardcoded) in nsARIAMap.cpp, 
 *  and provide the mappings for WAI-ARIA roles and properties using the 
 *  structs defined in this file.
 */
00126 struct nsARIAMap
{
  /**
   * Array of supported ARIA role map entries and its length.
   */
00131   static nsRoleMapEntry gWAIRoleMap[];
  static PRUint32 gWAIRoleMapLength;

  /**
   * Landmark role map entry. Used when specified ARIA role isn't mapped to
   * accessibility API.
   */
00138   static nsRoleMapEntry gLandmarkRoleMap;

  /**
   * Empty role map entry. Used by accessibility service to create an accessible
   * if the accessible can't use role of used accessible class. For example,
   * it is used for table cells that aren't contained by table.
   */
00145   static nsRoleMapEntry gEmptyRoleMap;

  /**
   * State map of ARIA states applied to any accessible not depending on
   * the role.
   */
00151   static nsStateMapEntry gWAIUnivStateMap[];
};

#endif

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