pjs/accessible/public/nsIAccessibleText.idl

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/* -*- 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 the Mozilla browser.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Paul Sandoz (paul.sandoz@sun.com)
* Bill Haneman (bill.haneman@sun.com)
* 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 ***** */
#include "nsISupports.idl"
typedef long nsAccessibleTextBoundary;
interface nsIAccessible;
[scriptable, uuid(17389a66-5cc5-4550-80e0-49e7b63990a4)]
interface nsIAccessibleText : nsISupports
{
const nsAccessibleTextBoundary BOUNDARY_CHAR = 0;
const nsAccessibleTextBoundary BOUNDARY_WORD_START = 1;
const nsAccessibleTextBoundary BOUNDARY_WORD_END = 2;
const nsAccessibleTextBoundary BOUNDARY_SENTENCE_START = 3; // don't use, deprecated
const nsAccessibleTextBoundary BOUNDARY_SENTENCE_END = 4; // don't use, deprecated
const nsAccessibleTextBoundary BOUNDARY_LINE_START = 5;
const nsAccessibleTextBoundary BOUNDARY_LINE_END = 6;
const nsAccessibleTextBoundary BOUNDARY_ATTRIBUTE_RANGE = 7;
attribute long caretOffset;
readonly attribute long characterCount;
readonly attribute long selectionCount;
/**
* String methods may need to return multibyte-encoded strings,
* since some locales can't be encoded using 16-bit chars.
* So the methods below might return UTF-16 strings, or they could
* return "string" values which are UTF-8.
*/
AString getText (in long startOffset, in long endOffset);
AString getTextAfterOffset (in long offset,
in nsAccessibleTextBoundary boundaryType,
out long startOffset,
out long endOffset);
AString getTextAtOffset (in long offset,
in nsAccessibleTextBoundary boundaryType,
out long startOffset,
out long endOffset);
AString getTextBeforeOffset (in long offset,
in nsAccessibleTextBoundary boundaryType,
out long startOffset,
out long endOffset);
/**
* It would be better to return an unsigned long here,
* to allow unicode chars > 16 bits
*/
wchar getCharacterAtOffset (in long offset);
/**
* Get the accessible and start/end offsets around the given offset.
* This accessible get return the DOM node and layout frame
* with the uniform attributes for this range of text
*/
nsIAccessible getAttributeRange (in long offset,
out long rangeStartOffset,
out long rangeEndOffset);
/**
* Returns the bounding box of the specified position.
*
* The virtual character after the last character of the represented text,
* i.e. the one at position length is a special case. It represents the
* current input position and will therefore typically be queried by AT more
* often than other positions. Because it does not represent an existing
* character its bounding box is defined in relation to preceding characters.
* It should be roughly equivalent to the bounding box of some character when
* inserted at the end of the text. Its height typically being the maximal
* height of all the characters in the text or the height of the preceding
* character, its width being at least one pixel so that the bounding box is
* not degenerate.
*
* @param offset - Index of the character for which to return its bounding
* box. The valid range is 0..length.
* @param x - X coordinate of the bounding box of the referenced character.
* @param y - Y coordinate of the bounding box of the referenced character.
* @param width - Width of the bounding box of the referenced character.
* @param height - Height of the bounding box of the referenced character.
* @param coordType - Specifies if the coordinates are relative to the screen
* or to the parent window (see constants declared in
* nsIAccessibleCoordinateType).
*/
void getCharacterExtents (in long offset,
out long x,
out long y,
out long width,
out long height,
in unsigned long coordType);
void getRangeExtents (in long startOffset,
in long endOffset,
out long x,
out long y,
out long width,
out long height,
in unsigned long coordType);
/**
* Get the text offset at the given point, or return -1
* if no character exists at that point
*
* @param x - The position's x value for which to look up the index of the
* character that is rendered on to the display at that point.
* @param y - The position's y value for which to look up the index of the
* character that is rendered on to the display at that point.
* @param coordType - Screen coordinates or window coordinates (see constants
* declared in nsIAccessibleCoordinateType).
* @return offset - Index of the character under the given point or -1 if
* the point is invalid or there is no character under
* the point.
*/
long getOffsetAtPoint (in long x, in long y,
in unsigned long coordType);
void getSelectionBounds (in long selectionNum,
out long startOffset,
out long endOffset);
void setSelectionBounds (in long selectionNum,
in long startOffset,
in long endOffset);
void addSelection (in long startOffset, in long endOffset);
void removeSelection (in long selectionNum);
};
/*
Assumptions:
Using wstring (UCS2) instead of string encoded in UTF-8.
Multibyte encodings (or at least potentially multi-byte
encodings) would be preferred for the reasons cited above.
The following methods will throw an exception on failure
(since not every text component will allow every operation):
setSelectionBounds, addSelection, removeSelection, setCaretOffset.
getRangeAttributes defined to return an nsISupports
interface instead of a pango specific data structure.
It may be that some other return type is more appropriate
for mozilla text attributes.
we assume that all text components support the idea of
a caret offset, whether visible or "virtual". If this
isn't the case, caretOffset can be made readonly and
a setCaretOffset method provided which throws an exception
on failure (as with *selection methods above).
*/