/*******************************************************************************
* Copyright (c) 2009, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.accessibility;
/**
* This adapter class provides default implementations for the
* methods in the <code>AccessibleTextExtendedListener</code> interface.
* <p>
* Classes that wish to deal with <code>AccessibleTextExtended</code> events can
* extend this class and override only the methods that they are
* interested in.
* </p>
*
* @see AccessibleTextExtendedListener
* @see AccessibleTextEvent
*
* @since 1.4
*/
public class AccessibleTextExtendedAdapter extends AccessibleTextAdapter implements AccessibleTextExtendedListener {
/**
* Adds a text selection.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] start - the 0 based offset of the first character of the new selection</li>
* <li>[in] end - the 0 based offset after the last character of the new selection</li>
* <li>[out] result - set to {@link ACC#OK} if the text selection was added</li>
* </ul>
*/
public void addSelection(AccessibleTextEvent e) {}
/**
* Returns the total number of characters in the text.
*
* @param e an event object containing the following fields:<ul>
* <li>[out] count - the total number of characters</li>
* </ul>
*/
public void getCharacterCount(AccessibleTextEvent e) {}
/**
* Returns the number of links and link groups contained within this hypertext
* paragraph.
*
* @param e an event object containing the following fields:<ul>
* <li>[out] count - the number of links and link groups within this hypertext paragraph,
* or 0 if there are none</li>
* </ul>
*/
public void getHyperlinkCount(AccessibleTextEvent e) {}
/**
* Returns the specified hyperlink.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] index - the 0 based index of the hyperlink to return</li>
* <li>[out] accessible - the specified hyperlink object, or null if the index is invalid</li>
* </ul>
*/
public void getHyperlink(AccessibleTextEvent e) {}
/**
* Returns the index of the hyperlink that is associated with this character offset.
* <p>
* This is the case when a link spans the given character index.
* </p>
* @param e an event object containing the following fields:<ul>
* <li>[in] offset - the 0 based offset of the character for which to return the link index</li>
* <li>[out] index - the 0 based index of the hyperlink that is associated with this
* character offset, or -1 if the offset is not in a link</li>
* </ul>
*/
public void getHyperlinkIndex(AccessibleTextEvent e) {}
/**
* Returns the offset of the character under the specified point.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] x - the X value in display coordinates for which to look up the offset of the character
* that is rendered on the display at that point</li>
* <li>[in] y - the position's Y value for which to look up the offset of the character
* that is rendered on the display at that point</li>
* <li>[out] offset - the 0 based offset of the character under the given point,
* or -1 if the point is invalid or there is no character under the point</li>
* </ul>
*/
public void getOffsetAtPoint(AccessibleTextEvent e) {}
/**
* Returns the text range(s) contained within the given bounding box.
* <p>
* Partially visible characters are included in the returned ranges.
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>[in] x - the X coordinate of the top left corner of the bounding box, in display relative coordinates</li>
* <li>[in] y - the Y coordinate of the top left corner of the bounding box, in display relative coordinates</li>
* <li>[in] width - the width of the bounding box</li>
* <li>[in] height - the height of the bounding box</li>
* <li>[typical out] start - the 0 based offset of the first character of the substring in the bounding box</li>
* <li>[typical out] end - the 0 based offset after the last character of the substring in the bounding box</li>
* <li>[optional out] ranges - an array of pairs specifying the start and end offsets of each range,
* if the text range is clipped by the bounding box</li>
* </ul>
*/
public void getRanges(AccessibleTextEvent e) {}
/**
* Returns the character offsets of the specified text selection.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] index - the 0 based index of the selection</li>
* <li>[out] start - the 0 based offset of first selected character</li>
* <li>[out] end - the 0 based offset after the last selected character</li>
* </ul>
*/
public void getSelection(AccessibleTextEvent e) {}
/**
* Returns the number of active non-contiguous selections.
*
* @param e an event object containing the following fields:<ul>
* <li>[out] count - the number of active non-contiguous selections</li>
* </ul>
*/
public void getSelectionCount(AccessibleTextEvent e) {}
/**
* Returns a substring and its range for the given range, count and boundary type.
* <p>
* Returns the substring of the specified boundary type that is located count
* positions from the given character range. Also returns the start and end
* offsets of the returned substring.
* </p><p>
* For example, if the boundary type is TEXT_BOUNDARY_WORD, then the complete
* word that is located count words from the specified range is returned.
* If count is negative, then return the word that is count words before start.
* If count is positive, then return the word that is count words after end.
* If count is zero, start and end are the same, so return the word at start.
* </p><p>
* The whole text can be requested by passing start == 0 and end == getCharacterCount,
* TEXT_BOUNDARY_ALL, and 0 for count. Alternatively the whole text can be requested
* by calling AccessibleControlListener.getValue().
* </p><p>
* If start and end are valid, but no suitable word (or other boundary type) is found,
* the returned string is null and the returned range is degenerate (start == end).
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>[in] type - the boundary type of the substring to return. One of:<ul>
* <li> {@link ACC#TEXT_BOUNDARY_CHAR}</li>
* <li> {@link ACC#TEXT_BOUNDARY_WORD}</li>
* <li> {@link ACC#TEXT_BOUNDARY_SENTENCE}</li>
* <li> {@link ACC#TEXT_BOUNDARY_PARAGRAPH}</li>
* <li> {@link ACC#TEXT_BOUNDARY_LINE}</li>
* <li> {@link ACC#TEXT_BOUNDARY_ALL}</li>
* </ul></li>
* <li>[in,out] start - the 0 based offset of first character of the substring</li>
* <li>[in,out] end - the 0 based offset after the last character of the substring</li>
* <li>[in,out] count - the number of boundary type units to move to find the substring:<ul>
* <li>in - look count units before start if count < 0, or after end if count > 0. Look at start if count == 0</li>
* <li>out - the actual number of boundary type units that were moved. This may be fewer than the input count</li>
* </ul></li>
* <li>[out] result - the requested substring. This may be empty or null
* when no appropriate substring is found, or if the type is invalid.</li>
* </ul>
*/
public void getText(AccessibleTextEvent e) {}
/**
* Returns the bounding box(es) of the specified text range in display coordinates.
* <p>
* Typically, the text range will represent a single character, i.e. end - start = 1,
* therefore providers should optimize for this case.
* </p><p>
* Note: The virtual character after the last character of the represented text,
* i.e. the one at offset getCharacterCount, 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.
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>[in] start - the 0 based offset of the first character of the substring in the bounding box</li>
* <li>[in] end - the 0 based offset after the last character of the substring in the bounding box</li>
* <li>[typical out] x - the X coordinate of the top left corner of the bounding box of the specified substring</li>
* <li>[typical out] y - the Y coordinate of the top left corner of the bounding box of the specified substring</li>
* <li>[typical out] width - the width of the bounding box of the specified substring</li>
* <li>[typical out] height - the height of the bounding box of the specified substring</li>
* <li>[optional out] rectangles - a set of disjoint bounding rectangles, if the specified text range includes
* partial lines</li>
* </ul>
*/
public void getTextBounds(AccessibleTextEvent e) {}
/**
* Returns the visible text range(s).
* <p>
* Partially visible characters are included in the returned ranges.
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>[typical out] start - the 0 based offset of the first character of the visible substring</li>
* <li>[typical out] end - the 0 based offset after the last character of the visible substring</li>
* <li>[optional out] ranges - an array of pairs specifying the start and end offsets of each range,
* if the visible text range is clipped</li>
* </ul>
*/
public void getVisibleRanges(AccessibleTextEvent e) {}
/**
* Deselects a range of text.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] index - the 0 based index of selection to remove</li>
* <li>[out] result - set to {@link ACC#OK} if the range of text was deselected</li>
* </ul>
*/
public void removeSelection(AccessibleTextEvent e) {}
/**
* Scrolls a specific part of a substring according to the scroll type.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] start - the 0 based offset of the first character of the substring</li>
* <li>[in] end - the 0 based offset after the last character of the substring</li>
* <li>[in] type - a scroll type indicating where the substring should be placed
* on the screen. One of:<ul>
* <li> {@link ACC#SCROLL_TYPE_TOP_LEFT}</li>
* <li> {@link ACC#SCROLL_TYPE_BOTTOM_RIGHT}</li>
* <li> {@link ACC#SCROLL_TYPE_TOP_EDGE}</li>
* <li> {@link ACC#SCROLL_TYPE_BOTTOM_EDGE}</li>
* <li> {@link ACC#SCROLL_TYPE_LEFT_EDGE}</li>
* <li> {@link ACC#SCROLL_TYPE_RIGHT_EDGE}</li>
* <li> {@link ACC#SCROLL_TYPE_ANYWHERE}</li>
* <li> {@link ACC#SCROLL_TYPE_POINT}</li>
* </ul></li>
* <li>[optional in] x - for SCROLL_TYPE_POINT, the X coordinate of the destination point in display coordinates</li>
* <li>[optional in] y - for SCROLL_TYPE_POINT, the Y coordinate of the destination point in display coordinates</li>
* <li>[out] result - set to {@link ACC#OK} if the text was scrolled</li>
* </ul>
*/
public void scrollText(AccessibleTextEvent e) {}
/**
* Sets the position of the caret.
* <p>
* The caret position is that of the character logically following it,
* e.g. to the right of it in a left to right language.
* The caret is actually placed to the leading side of the character with
* that offset. An offset of 0 places the caret so that the next insertion
* goes before the first character. An offset of getCharacterCount places
* the caret so that the next insertion goes after the last character.
* </p><p>
* Setting the caret position may or may not alter the current selection. A
* change of the selection is notified to the accessibility event listeners with
* an EVENT_TEXT_SELECTION_CHANGED event.
* </p><p>
* When the new caret position differs from the old one, this is notified to the
* accessibility event listeners with an EVENT_TEXT_CARET_MOVED event.
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>[in] offset - the new offset of the caret</li>
* <li>[out] result - set to {@link ACC#OK} if the caret position was set</li>
* </ul>
*/
public void setCaretOffset(AccessibleTextEvent e) {}
/**
* Changes the bounds of an existing selection.
*
* @param e an event object containing the following fields:<ul>
* <li>[in] index - the 0 based index of the selection to change</li>
* <li>[in] start - the new 0 based offset of the first character of the selection</li>
* <li>[in] end - the new 0 based offset after the last character of the selection</li>
* <li>[out] result - set to {@link ACC#OK} if the selection was set</li>
* </ul>
*/
public void setSelection(AccessibleTextEvent e) {}
}