gecko/accessible/src/base/nsAccUtils.h

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#ifndef nsAccUtils_h_
#define nsAccUtils_h_

#include "nsIAccessible.h"
#include "nsIAccessNode.h"
#include "nsARIAMap.h"

#include "nsIDOMNode.h"
#include "nsIPersistentProperties2.h"
#include "nsIContent.h"
#include "nsPoint.h"

class nsAccUtils
{
public:
  /**
   * Returns value of attribute from the given attributes container.
   *
   * @param aAttributes - attributes container
   * @param aAttrName - the name of requested attribute
   * @param aAttrValue - value of attribute
   */
  static void GetAccAttr(nsIPersistentProperties *aAttributes,
                         nsIAtom *aAttrName,
                         nsAString& aAttrValue);

  /**
   * Set value of attribute for the given attributes container.
   *
   * @param aAttributes - attributes container
   * @param aAttrName - the name of requested attribute
   * @param aAttrValue - new value of attribute
   */
  static void SetAccAttr(nsIPersistentProperties *aAttributes,
                         nsIAtom *aAttrName,
                         const nsAString& aAttrValue);

  /**
   * Return values of group attributes ('level', 'setsize', 'posinset')
   */
  static void GetAccGroupAttrs(nsIPersistentProperties *aAttributes,
                               PRInt32 *aLevel,
                               PRInt32 *aPosInSet,
                               PRInt32 *aSetSize);

  /**
   * Returns true if there are level, posinset and sizeset attributes.
   */
  static PRBool HasAccGroupAttrs(nsIPersistentProperties *aAttributes);

  /**
   * Set group attributes ('level', 'setsize', 'posinset').
   */
  static void SetAccGroupAttrs(nsIPersistentProperties *aAttributes,
                               PRInt32 aLevel,
                               PRInt32 aPosInSet,
                               PRInt32 aSetSize);

  /**
   * Set group attributes - 'level', 'setsize', 'posinset'.
   *
   * @param aNode - XUL element that implements
   *                nsIDOMXULSelectControlItemElement interface
   * @param aAttributes - attributes container
   */
  static void SetAccAttrsForXULSelectControlItem(nsIDOMNode *aNode,
                                                 nsIPersistentProperties *aAttributes);

  /**
   * Set group attributes - 'level', 'setsize', 'posinset'.
   *
   * @param  aNode        XUL element that implements
   *                      nsIDOMXULContainerItemElement interface
   * @param  aAttributes  attributes container
   */
  static void SetAccAttrsForXULContainerItem(nsIDOMNode *aNode,
                                             nsIPersistentProperties *aAttributes);

  /**
   * Set container-foo live region attributes for the given node.
   *
   * @param aAttributes    where to store the attributes
   * @param aStartContent  node to start from
   * @param aTopContent    node to end at
   */
  static void SetLiveContainerAttributes(nsIPersistentProperties *aAttributes,
                                         nsIContent *aStartContent,
                                         nsIContent *aTopContent);

  /**
   * Return PR_TRUE if the ARIA property should always be exposed as an object
   * attribute.
   */
  static PRBool IsARIAPropForObjectAttr(nsIAtom *aAtom);

  /**
   * Fire accessible event of the given type for the given accessible.
   */
  static nsresult FireAccEvent(PRUint32 aEventType, nsIAccessible *aAccessible,
                               PRBool aIsAsynch = PR_FALSE);

  /**
    * If an ancestor in this document exists with the given role, return it
    * @param aDescendant Descendant to start search with
    * @param aRole Role to find matching ancestor for
    * @return The ancestor accessible with the given role, or nsnull if no match is found
    */
   static already_AddRefed<nsIAccessible>
     GetAncestorWithRole(nsIAccessible *aDescendant, PRUint32 aRole);

   /**
     * For an ARIA tree item , get the accessible that represents its conceptual parent.
     * This method will use the correct method for the given way the tree is constructed.
     * The conceptual parent is what the user sees as the parent, not the DOM or accessible parent.
     * @param aStartTreeItem  The tree item to get the parent for
     * @param aStartTreeItemContent  The content node for the tree item
     * @param The tree item's parent, or null if none
     */
   static void
     GetARIATreeItemParent(nsIAccessible *aStartTreeItem,
                           nsIContent *aStartTreeItemContent,
                           nsIAccessible **aTreeItemParent);

  /**
   * Converts the given coordinates to coordinates relative screen.
   *
   * @param aX               [in] the given x coord
   * @param aY               [in] the given y coord
   * @param aCoordinateType  [in] specifies coordinates origin (refer to
   *                         nsIAccessibleCoordinateType)
   * @param aAccessNode      [in] the accessible if coordinates are given
   *                         relative it.
   * @param aCoords          [out] converted coordinates
   */
  static nsresult ConvertToScreenCoords(PRInt32 aX, PRInt32 aY,
                                        PRUint32 aCoordinateType,
                                        nsIAccessNode *aAccessNode,
                                        nsIntPoint *aCoords);

  /**
   * Converts the given coordinates relative screen to another coordinate
   * system.
   *
   * @param aX               [in, out] the given x coord
   * @param aY               [in, out] the given y coord
   * @param aCoordinateType  [in] specifies coordinates origin (refer to
   *                         nsIAccessibleCoordinateType)
   * @param aAccessNode      [in] the accessible if coordinates are given
   *                         relative it
   */
  static nsresult ConvertScreenCoordsTo(PRInt32 *aX, PRInt32 *aY,
                                        PRUint32 aCoordinateType,
                                        nsIAccessNode *aAccessNode);

  /**
   * Returns coordinates relative screen for the top level window.
   *
   * @param aAccessNode  the accessible hosted in the window
   */
  static nsIntPoint GetScreenCoordsForWindow(nsIAccessNode *aAccessNode);

  /**
   * Returns coordinates relative screen for the parent of the given accessible.
   *
   * @param aAccessNode  the accessible
   */
  static nsIntPoint GetScreenCoordsForParent(nsIAccessNode *aAccessNode);

  /**
   * Get the role map entry for a given DOM node. This will use the first
   * ARIA role if the role attribute provides a space delimited list of roles.
   * @param aNode  The DOM node to get the role map entry for
   * @return       A pointer to the role map entry for the ARIA role, or nsnull if none
   */
   static nsRoleMapEntry* GetRoleMapEntry(nsIDOMNode *aNode);
};

#endif