gecko-dev/accessible/public/nsIAccessiblePivot.idl

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/* -*- 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 TextBoundaryType;
interface nsIAccessible;
interface nsIAccessibleText;
interface nsIAccessibleTraversalRule;
interface nsIAccessiblePivotObserver;
/**
* 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(15ff23de-879e-47ea-b536-6532466108c5)]
interface nsIAccessiblePivot : nsISupports
{
const TextBoundaryType CHAR_BOUNDARY = 0;
const TextBoundaryType WORD_BOUNDARY = 1;
const TextBoundaryType LINE_BOUNDARY = 2;
const TextBoundaryType ATTRIBUTE_RANGE_BOUNDARY = 3;
/**
* The accessible the pivot is currently pointed at.
*/
attribute nsIAccessible position;
/**
* The root of the subtree in which the pivot traverses.
*/
readonly attribute nsIAccessible root;
/**
* The start offset of the text range the pivot points at, otherwise -1.
*/
readonly attribute long startOffset;
/**
* The end offset of the text range the pivot points at, otherwise -1.
*/
readonly attribute long endOffset;
/**
* Set the pivot's text range in a text accessible.
*
* @param aTextAccessible [in] the text accessible that contains the desired
* range.
* @param aStartOffset [in] the start offset to set.
* @param aEndOffset [in] the end offset to set.
* @throws NS_ERROR_INVALID_ARG when the offset exceeds the accessible's
* character count.
*/
void setTextRange(in nsIAccessibleText aTextAccessible,
in long aStartOffset, in long aEndOffset);
/**
* 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 true on success, false if there are no new nodes to traverse to.
*/
[optional_argc] boolean moveNext(in nsIAccessibleTraversalRule aRule,
[optional] in nsIAccessible aAnchor,
[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 true on success, false if there are no new nodes to traverse to.
*/
[optional_argc] boolean movePrevious(in nsIAccessibleTraversalRule aRule,
[optional] in nsIAccessible aAnchor,
[optional] in boolean aIncludeStart);
/**
* Move pivot to first object in subtree complying to given traversal rule.
*
* @param aRule [in] traversal rule to use.
* @return true on success, false if there are no new nodes to traverse to.
*/
boolean moveFirst(in nsIAccessibleTraversalRule aRule);
/**
* Move pivot to last object in subtree complying to given traversal rule.
*
* @param aRule [in] traversal rule to use.
* @return true on success, false if there are no new nodes to traverse to.
*/
boolean moveLast(in nsIAccessibleTraversalRule aRule);
/**
* Move pivot to next text range.
*
* @param aBoundary [in] type of boundary for next text range, character, word,
* etc.
* @return true on success, false if there are is no more text.
*/
boolean moveNextByText(in TextBoundaryType aBoundary);
/**
* Move pivot to previous text range.
*
* @param aBoundary [in] type of boundary for previous text range, character,
* word, etc.
* @return true on success, false if there are is no more text.
*/
boolean movePreviousByText(in TextBoundaryType aBoundary);
/**
* Add an observer for pivot changes.
*
* @param aObserver [in] the observer object to be notified of pivot changes.
*/
void addObserver(in nsIAccessiblePivotObserver aObserver);
/**
* Remove an observer for pivot changes.
*
* @param aObserver [in] the observer object to remove from being notified.
*/
void removeObserver(in nsIAccessiblePivotObserver aObserver);
};
/**
* An observer interface for pivot changes.
*/
[scriptable, uuid(b6508c5e-c081-467d-835c-613eedf9ee9b)]
interface nsIAccessiblePivotObserver : nsISupports
{
/**
* Called when the pivot changes.
*
* @param aPivot [in] the pivot that has changed.
* @param aOldAccessible [in] the old pivot position before the change, or null.
* @param aOldStart [in] the old start offset, or -1.
* @param aOldEnd [in] the old end offset, or -1.
*/
void onPivotChanged(in nsIAccessiblePivot aPivot,
in nsIAccessible aOldAccessible,
in long aOldStart, in long aOldEnd);
};
[scriptable, uuid(307d98b6-dba9-49cf-ba17-ef8b053044eb)]
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;
/* Pre-filters */
const unsigned long PREFILTER_INVISIBLE = 0x00000001;
const unsigned long PREFILTER_OFFSCREEN = 0x00000002;
const unsigned long PREFILTER_NOT_FOCUSABLE = 0x00000004;
/**
* Pre-filter bitfield to filter out obviously ignorable nodes and lighten
* the load on match().
*/
readonly attribute unsigned long preFilter;
/**
* Retrieve a list of roles that the traversal rule should test for. Any node
* with a role not in this list will automatically be ignored. An empty list
* will match all roles. It should be assumed that this method is called once
* at the start of a traversal, so changing the method's return result after
* that would have no affect.
*
* @param aRoles [out] an array of the roles to match.
* @param aCount [out] the length of the array.
*/
void getMatchRoles([array, size_is(aCount)]out unsigned long aRoles,
[retval]out unsigned long aCount);
/**
* 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);
};