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3b3a1815ea
Most OS APIs want a cluster when they ask for a "character", except ATK. Rather than altering BOUNDARY_CHAR, I added a new BOUNDARY_CLUSTER. Aside from being less risky and causing less churn, there are cases internally where we want to move a TextLeafPoint by character; e.g. to explicitly move to the next/previous Accessible or to move to the next/previous character in an abstract way without worrying about Accessible boundaries. Calculating clusters is more expensive, so it doesn't make sense to move by cluster in those cases. Differential Revision: https://phabricator.services.mozilla.com/D212517
227 lines
9.5 KiB
Plaintext
227 lines
9.5 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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typedef long AccessibleTextBoundary;
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interface nsIAccessible;
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interface nsIArray;
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interface nsIPersistentProperties;
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interface nsIAccessibleTextRange;
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[scriptable, builtinclass, uuid(a4cc7576-45bb-44c5-b347-d9cb3ca4de9f)]
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interface nsIAccessibleText : nsISupports
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{
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// In parameters for character offsets:
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// -1 will be treated as the equal to the end of the text
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// -2 will be treated as the caret position
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const int32_t TEXT_OFFSET_END_OF_TEXT = -1;
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const int32_t TEXT_OFFSET_CARET = -2;
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// A single Unicode character. For a user-perceived character, see
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// BOUNDARY_CLUSTER.
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const AccessibleTextBoundary BOUNDARY_CHAR = 0;
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const AccessibleTextBoundary BOUNDARY_WORD_START = 1;
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const AccessibleTextBoundary BOUNDARY_WORD_END = 2;
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const AccessibleTextBoundary BOUNDARY_SENTENCE_START = 3; // don't use, deprecated
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const AccessibleTextBoundary BOUNDARY_SENTENCE_END = 4; // don't use, deprecated
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const AccessibleTextBoundary BOUNDARY_LINE_START = 5;
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const AccessibleTextBoundary BOUNDARY_LINE_END = 6;
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const AccessibleTextBoundary BOUNDARY_PARAGRAPH = 7;
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// A grapheme cluster, AKA user-perceived character. This might consist of
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// multiple Unicode characters, but a user will perceive this as a single
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// character and it is treated as such by the caret, selection, etc.
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const AccessibleTextBoundary BOUNDARY_CLUSTER = 8;
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/**
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* The current current caret offset.
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* If set < 0 then caret will be placed at the end of the text
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*/
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attribute long caretOffset;
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void getCaretRect(out long x, out long y, out long width, out long height);
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readonly attribute long characterCount;
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readonly attribute long selectionCount;
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/**
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* String methods may need to return multibyte-encoded strings,
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* since some locales can't be encoded using 16-bit chars.
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* So the methods below might return UTF-16 strings, or they could
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* return "string" values which are UTF-8.
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*/
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AString getText (in long startOffset, in long endOffset);
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AString getTextAfterOffset (in long offset,
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in AccessibleTextBoundary boundaryType,
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out long startOffset,
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out long endOffset);
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AString getTextAtOffset (in long offset,
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in AccessibleTextBoundary boundaryType,
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out long startOffset,
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out long endOffset);
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AString getTextBeforeOffset (in long offset,
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in AccessibleTextBoundary boundaryType,
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out long startOffset,
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out long endOffset);
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/**
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* It would be better to return an unsigned long here,
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* to allow unicode chars > 16 bits
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*/
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wchar getCharacterAtOffset (in long offset);
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/**
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* Get the accessible start/end offsets around the given offset,
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* return the text attributes for this range of text.
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*
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* @param includeDefAttrs [in] points whether text attributes applied to
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* the entire accessible should be included or not.
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* @param offset [in] text offset
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* @param rangeStartOffset [out] start offset of the range of text
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* @param rangeEndOffset [out] end offset of the range of text
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*/
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nsIPersistentProperties getTextAttributes(in boolean includeDefAttrs,
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in long offset,
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out long rangeStartOffset,
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out long rangeEndOffset);
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/**
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* Return the text attributes that apply to the entire accessible.
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*/
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readonly attribute nsIPersistentProperties defaultTextAttributes;
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/**
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* Returns the bounding box of the specified position.
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*
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* The virtual character after the last character of the represented text,
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* i.e. the one at position length is a special case. It represents the
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* current input position and will therefore typically be queried by AT more
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* often than other positions. Because it does not represent an existing
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* character its bounding box is defined in relation to preceding characters.
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* It should be roughly equivalent to the bounding box of some character when
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* inserted at the end of the text. Its height typically being the maximal
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* height of all the characters in the text or the height of the preceding
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* character, its width being at least one pixel so that the bounding box is
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* not degenerate.
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*
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* @param offset - Index of the character for which to return its bounding
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* box. The valid range is 0..length.
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* @param x - X coordinate of the bounding box of the referenced character.
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* @param y - Y coordinate of the bounding box of the referenced character.
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* @param width - Width of the bounding box of the referenced character.
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* @param height - Height of the bounding box of the referenced character.
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* @param coordType - Specifies if the coordinates are relative to the screen
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* or to the parent window (see constants declared in
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* nsIAccessibleCoordinateType).
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*/
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void getCharacterExtents (in long offset,
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out long x,
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out long y,
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out long width,
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out long height,
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in unsigned long coordType);
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void getRangeExtents (in long startOffset,
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in long endOffset,
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out long x,
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out long y,
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out long width,
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out long height,
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in unsigned long coordType);
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/**
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* Get the text offset at the given point, or return -1
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* if no character exists at that point
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*
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* @param x - The position's x value for which to look up the index of the
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* character that is rendered on to the display at that point.
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* @param y - The position's y value for which to look up the index of the
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* character that is rendered on to the display at that point.
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* @param coordType - Screen coordinates or window coordinates (see constants
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* declared in nsIAccessibleCoordinateType).
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* @return offset - Index of the character under the given point or -1 if
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* the point is invalid or there is no character under
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* the point.
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*/
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long getOffsetAtPoint (in long x, in long y,
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in unsigned long coordType);
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void getSelectionBounds (in long selectionNum,
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out long startOffset,
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out long endOffset);
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/**
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* Set the bounds for the given selection range.
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* A reverse range where the start offset is larger than the end offset is
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* acceptable. The caretOffset will be set to the endOffset argument.
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*/
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void setSelectionBounds (in long selectionNum,
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in long startOffset,
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in long endOffset);
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void addSelection (in long startOffset, in long endOffset);
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void removeSelection (in long selectionNum);
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/**
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* Makes a specific part of string visible on screen.
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*
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* @param startIndex 0-based character offset
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* @param endIndex 0-based character offset - the offset of the
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* character just past the last character of the
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* string
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* @param scrollType defines how to scroll (see nsIAccessibleScrollType for
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* available constants)
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*/
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void scrollSubstringTo(in long startIndex, in long endIndex,
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in unsigned long scrollType);
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/**
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* Moves the top left of a substring to a specified location.
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*
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* @param startIndex 0-based character offset
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* @param endIndex 0-based character offset - the offset of the
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* character just past the last character of
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* the string
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* @param coordinateType specifies the coordinates origin (for available
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* constants refer to nsIAccessibleCoordinateType)
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* @param x defines the x coordinate
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* @param y defines the y coordinate
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*/
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void scrollSubstringToPoint(in long startIndex, in long endIndex,
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in unsigned long coordinateType,
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in long x, in long y);
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/**
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* Return an array of disjoint ranges for selected text within the text control
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* or otherwise the document this accessible belongs to.
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*/
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readonly attribute nsIArray selectionRanges;
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};
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/*
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Assumptions:
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Using wstring (UCS2) instead of string encoded in UTF-8.
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Multibyte encodings (or at least potentially multi-byte
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encodings) would be preferred for the reasons cited above.
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The following methods will throw an exception on failure
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(since not every text component will allow every operation):
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setSelectionBounds, addSelection, removeSelection, setCaretOffset.
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we assume that all text components support the idea of
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a caret offset, whether visible or "virtual". If this
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isn't the case, caretOffset can be made readonly and
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a setCaretOffset method provided which throws an exception
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on failure (as with *selection methods above).
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*/
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