/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * 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 long AccessibleTextBoundary; interface nsIAccessible; interface nsIPersistentProperties; [scriptable, uuid(43d81eb0-1215-4dc4-9226-a4355bd2d20d)] interface nsIAccessibleText : nsISupports { // In parameters for character offsets: // -1 will be treated as the equal to the end of the text // -2 will be treated as the caret position const int32_t TEXT_OFFSET_END_OF_TEXT = -1; const int32_t TEXT_OFFSET_CARET = -2; const AccessibleTextBoundary BOUNDARY_CHAR = 0; const AccessibleTextBoundary BOUNDARY_WORD_START = 1; const AccessibleTextBoundary BOUNDARY_WORD_END = 2; const AccessibleTextBoundary BOUNDARY_SENTENCE_START = 3; // don't use, deprecated const AccessibleTextBoundary BOUNDARY_SENTENCE_END = 4; // don't use, deprecated const AccessibleTextBoundary BOUNDARY_LINE_START = 5; const AccessibleTextBoundary BOUNDARY_LINE_END = 6; /** * The current current caret offset. * If set < 0 then caret will be placed at the end of the text */ 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 AccessibleTextBoundary boundaryType, out long startOffset, out long endOffset); AString getTextAtOffset (in long offset, in AccessibleTextBoundary boundaryType, out long startOffset, out long endOffset); AString getTextBeforeOffset (in long offset, in AccessibleTextBoundary 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 start/end offsets around the given offset, * return the text attributes for this range of text. * * @param includeDefAttrs [in] points whether text attributes applied to * the entire accessible should be included or not. * @param offset [in] text offset * @param rangeStartOffset [out] start offset of the range of text * @param rangeEndOffset [out] end offset of the range of text */ nsIPersistentProperties getTextAttributes(in boolean includeDefAttrs, in long offset, out long rangeStartOffset, out long rangeEndOffset); /** * Return the text attributes that apply to the entire accessible. */ readonly attribute nsIPersistentProperties defaultTextAttributes; /** * 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); /** * Set the bounds for the given selection range */ void setSelectionBounds (in long selectionNum, in long startOffset, in long endOffset); void addSelection (in long startOffset, in long endOffset); void removeSelection (in long selectionNum); /** * Makes a specific part of string visible on screen. * * @param startIndex 0-based character offset * @param endIndex 0-based character offset - the offset of the * character just past the last character of the * string * @param scrollType defines how to scroll (see nsIAccessibleScrollType for * available constants) */ void scrollSubstringTo(in long startIndex, in long endIndex, in unsigned long scrollType); /** * Moves the top left of a substring to a specified location. * * @param startIndex 0-based character offset * @param endIndex 0-based character offset - the offset of the * character just past the last character of * the string * @param coordinateType specifies the coordinates origin (for available * constants refer to nsIAccessibleCoordinateType) * @param x defines the x coordinate * @param y defines the y coordinate */ void scrollSubstringToPoint(in long startIndex, in long endIndex, in unsigned long coordinateType, in long x, in long y); }; /* 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. 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). */