Logo Search packages:      
Sourcecode: xulrunner version File versions  Download package


/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 * The Original Code is mozilla.org code.
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 * Contributor(s):
 *   John Gaunt (jgaunt@netscape.com)
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 * ***** END LICENSE BLOCK ***** */

#ifndef _nsAccessible_H_
#define _nsAccessible_H_

#include "nsAccessNodeWrap.h"

#include "nsIAccessible.h"
#include "nsPIAccessible.h"
#include "nsIAccessibleHyperLink.h"
#include "nsIAccessibleSelectable.h"
#include "nsIAccessibleValue.h"
#include "nsIAccessibleRole.h"
#include "nsIAccessibleStates.h"
#include "nsAccessibleRelationWrap.h"
#include "nsIAccessibleEvent.h"

#include "nsIDOMNodeList.h"
#include "nsINameSpaceManager.h"
#include "nsWeakReference.h"
#include "nsString.h"
#include "nsIDOMDOMStringList.h"
#include "nsARIAMap.h"

struct nsRect;
class nsIContent;
class nsIFrame;
class nsIPresShell;
class nsIDOMNode;
class nsIAtom;
class nsIView;


// Saves a data member -- if child count equals this value we haven't
// cached children or child count yet
enum { eChildCountUninitialized = -1 };

class nsAccessibleDOMStringList : public nsIDOMDOMStringList
  virtual ~nsAccessibleDOMStringList();


  PRBool Add(const nsAString& aName) {
    return mNames.AppendString(aName);

  nsStringArray mNames;

#define NS_ACCESSIBLE_IMPL_CID                          \
{  /* 4E36C7A8-9203-4ef9-B619-271DDF6BB839 */           \
  0x4e36c7a8,                                           \
  0x9203,                                               \
  0x4ef9,                                               \
  { 0xb6, 0x19, 0x27, 0x1d, 0xdf, 0x6b, 0xb8, 0x39 }    \

class nsAccessible : public nsAccessNodeWrap, 
                     public nsIAccessible, 
                     public nsPIAccessible,
                     public nsIAccessibleHyperLink,
                     public nsIAccessibleSelectable,
                     public nsIAccessibleValue
  nsAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell);
  virtual ~nsAccessible();



  // nsAccessNode

  virtual nsresult Shutdown();

  // Public methods

   * Returns the accessible name specified by ARIA.
  nsresult GetARIAName(nsAString& aName);

   * Returns the accessible name provided by native markup. It doesn't take
   * into account ARIA stuffs used to specify the name.
  virtual nsresult GetNameInternal(nsAString& aName);

   * Return the state of accessible that doesn't take into account ARIA states.
   * Use nsIAccessible::state to get all states for accessible. If
   * second argument is omitted then second bit field of accessible state won't
   * be calculated.
  virtual nsresult GetStateInternal(PRUint32 *aState, PRUint32 *aExtraState);

   * Returns attributes for accessible without explicitly setted ARIA
   * attributes.
  virtual nsresult GetAttributesInternal(nsIPersistentProperties *aAttributes);

  // Helper methods
  already_AddRefed<nsIAccessible> GetParent() {
    nsIAccessible *parent = nsnull;
    return parent;

  PRBool MappedAttrState(nsIContent *aContent, PRUint32 *aStateInOut, nsStateMapEntry *aStateMapEntry);
  virtual nsIFrame* GetBoundsFrame();
  virtual void GetBoundsRect(nsRect& aRect, nsIFrame** aRelativeFrame);
  PRBool IsVisible(PRBool *aIsOffscreen); 

  // Relation helpers

   * For a given ARIA relation, such as labelledby or describedby, get the collated text
   * for the subtree that's pointed to.
   * @param aIDProperty  The ARIA relationship property to get the text for
   * @param aName        Where to put the text
   * @return error or success code
  nsresult GetTextFromRelationID(nsIAtom *aIDProperty, nsString &aName);

  // Name helpers
  nsresult GetHTMLName(nsAString& _retval, PRBool aCanAggregateSubtree = PR_TRUE);
  nsresult GetXULName(nsAString& aName, PRBool aCanAggregateSubtree = PR_TRUE);
  // For accessibles that are not lists of choices, the name of the subtree should be the 
  // sum of names in the subtree
  nsresult AppendFlatStringFromSubtree(nsIContent *aContent, nsAString *aFlatString);
  nsresult AppendNameFromAccessibleFor(nsIContent *aContent, nsAString *aFlatString,
                                       PRBool aFromValue = PR_FALSE);
  nsresult AppendFlatStringFromContentNode(nsIContent *aContent, nsAString *aFlatString);
  nsresult AppendStringWithSpaces(nsAString *aFlatString, const nsAString& textEquivalent);

  // helper method to verify frames
  static nsresult GetFullKeyName(const nsAString& aModifierName, const nsAString& aKeyName, nsAString& aStringOut);
  static nsresult GetTranslatedString(const nsAString& aKey, nsAString& aStringOut);

   * Walk into subtree and calculate the string which is used as the accessible
   * name or description.
   * @param aContent      [in] traversed content
   * @param aFlatString   [in, out] result string
   * @param aIsRootHidden [in] specifies whether root content (we started to
   *                      traverse from) is hidden, in this case the result
   *                      string is calculated from hidden children
   *                      (this is used when hidden root content is explicitly
   *                      specified as label or description by author)
  nsresult AppendFlatStringFromSubtreeRecurse(nsIContent *aContent,
                                              nsAString *aFlatString,
                                              PRBool aIsRootHidden);

  // Helpers for dealing with children
  virtual void CacheChildren();
  // nsCOMPtr<>& is useful here, because getter_AddRefs() nulls the comptr's value, and NextChild
  // depends on the passed-in comptr being null or already set to a child (finding the next sibling).
  nsIAccessible *NextChild(nsCOMPtr<nsIAccessible>& aAccessible);
  already_AddRefed<nsIAccessible> GetNextWithState(nsIAccessible *aStart, PRUint32 matchState);

   * Return an accessible for the given DOM node, or if that node isn't accessible, return the
   * accessible for the next DOM node which has one (based on forward depth first search)
   * @param aStartNode, the DOM node to start from
   * @param aRequireLeaf, only accept leaf accessible nodes
   * @return the resulting accessible
  already_AddRefed<nsIAccessible> GetFirstAvailableAccessible(nsIDOMNode *aStartNode, PRBool aRequireLeaf = PR_FALSE);

  // Hyperlink helpers
  virtual nsresult GetLinkOffset(PRInt32* aStartOffset, PRInt32* aEndOffset);

  // For accessibles that have actions
  static void DoCommandCallback(nsITimer *aTimer, void *aClosure);
  nsresult DoCommand(nsIContent *aContent = nsnull);

  // Check the visibility across both parent content and chrome
  PRBool CheckVisibilityInParentChain(nsIDocument* aDocument, nsIView* aView);

   *  Get the container node for an atomic region, defined by aria-atomic="true"
   *  @return the container node
  nsIDOMNode* GetAtomicRegion();

   * Get numeric value of the given ARIA attribute.
   * @param aAriaProperty - the ARIA property we're using
   * @param aValue - value of the attribute
   * @return - NS_OK_NO_ARIA_VALUE if there is no setted ARIA attribute
  nsresult GetAttrValue(nsIAtom *aAriaProperty, double *aValue);

   * Return the action rule based on ARIA enum constants EActionRule
   * (see nsARIAMap.h). Used by GetNumActions() and GetActionName().
   * @param aStates  [in] states of the accessible
  PRUint32 GetActionRule(PRUint32 aStates);

   * Fires platform accessible event. It's notification method only. It does
   * change nothing on Gecko side. Mostly you should use
   * nsIAccessible::FireAccessibleEvent excepting special cases like we have
   * in xul:tree accessible to lie to AT. Must be overridden in wrap classes.
   * @param aEvent  the accessible event to fire.
  virtual nsresult FirePlatformEvent(nsIAccessibleEvent *aEvent) = 0;

  // Data Members
  nsCOMPtr<nsIAccessible> mParent;
  nsCOMPtr<nsIAccessible> mFirstChild;
  nsCOMPtr<nsIAccessible> mNextSibling;

  nsRoleMapEntry *mRoleMapEntry; // Non-null indicates author-supplied role; possibly state & value as well
  PRInt32 mAccChildCount;



Generated by  Doxygen 1.6.0   Back to index