/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
http://mozilla.org/MPL/2.0/. */
#include "nsISupports.idl"
typedef short PivotMoveReason;
interface nsIAccessible;
interface nsIAccessibleTraversalRule;
/**
* The pivot interface encapsulates a reference to a single place in an accessible
* subtree. The pivot is a point or a range in the accessible tree. This interface
* provides traversal methods to move the pivot to next/prev state that complies
* to a given rule.
*/
[scriptable, uuid(81fe5144-059b-42db-bd3a-f6ce3158d5e9)]
interface nsIAccessiblePivot : nsISupports
{
/**
* Move pivot to next object, from current position or given anchor,
* complying to given traversal rule.
*
* @param aRule [in] traversal rule to use.
* @param aAnchor [in] accessible to start search from, if not provided,
* current position will be used.
* @param aIncludeStart [in] include anchor accessible in search.
* @return next accessible node that matches rule in preorder.
*/
[optional_argc] nsIAccessible next(in nsIAccessible aAnchor,
in nsIAccessibleTraversalRule aRule,
[optional] in boolean aIncludeStart);
/**
* Move pivot to previous object, from current position or given anchor,
* complying to given traversal rule.
*
* @param aRule [in] traversal rule to use.
* @param aAnchor [in] accessible to start search from, if not provided,
* current position will be used.
* @param aIncludeStart [in] include anchor accessible in search.
* @return previous accessible node that matches rule in preorder.
*/
[optional_argc] nsIAccessible prev(in nsIAccessible aAnchor,
in nsIAccessibleTraversalRule aRule,
[optional] in boolean aIncludeStart);
/**
* Move pivot to first object in subtree complying to given traversal rule.
*
* @param aRule [in] traversal rule to use.
* @return first accessible node in subtree that matches rule in preorder.
*/
nsIAccessible first(in nsIAccessibleTraversalRule aRule);
/**
* Move pivot to last object in subtree complying to given traversal rule.
*
* @param aRule [in] traversal rule to use.
* @return last accessible node in subtree that matches rule in preorder.
*/
nsIAccessible last(in nsIAccessibleTraversalRule aRule);
/**
* Move pivot to given coordinate in screen pixels.
*
* @param aX [in] screen's x coordinate
* @param aY [in] screen's y coordinate
* @param aRule [in] raversal rule to use.
* @return highest accessible in subtree that matches rule at given point.
*/
nsIAccessible atPoint(in long aX, in long aY,
in nsIAccessibleTraversalRule aRule);
};
[scriptable, uuid(e197460d-1eff-4247-b4bb-a43be1840dae)]
interface nsIAccessibleTraversalRule : nsISupports
{
/* Ignore this accessible object */
const unsigned short FILTER_IGNORE = 0x0;
/* Accept this accessible object */
const unsigned short FILTER_MATCH = 0x1;
/* Don't traverse accessibles children */
const unsigned short FILTER_IGNORE_SUBTREE = 0x2;
/**
* Determines if a given accessible is to be accepted in our traversal rule
*
* @param aAccessible [in] accessible to examine.
* @return a bitfield of FILTER_MATCH and FILTER_IGNORE_SUBTREE.
*/
unsigned short match(in nsIAccessible aAccessible);
};
