Java tutorial
/******************************************************************************* * Copyright (c) 2009, 2016 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * 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 3.6 */ 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override 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> */ @Override public void setSelection(AccessibleTextEvent e) { } }