gcc/libjava/javax/accessibility/AccessibleText.java

/* AccessibleText.java -- aids in accessibly manipulating text
   Copyright (C) 2000, 2002, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
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package javax.accessibility;

import java.awt.Point;
import java.awt.Rectangle;

import javax.swing.text.AttributeSet;

/**
 * Objects which present textual information on the display should implement
 * this interface.  Accessibility software can use the implementations of
 * this interface to change the attributes and spacial location of the text.
 *
 * <p>The <code>AccessibleContext.getAccessibleText()</code> method
 * should return <code>null</code> if an object does not implement this
 * interface.
 *
 * @author Eric Blake <ebb9@email.byu.edu>
 * @see Accessible
 * @see AccessibleContext
 * @see AccessibleContext#getAccessibleText()
 * @since 1.2
 * @status updated to 1.4
 */
public interface AccessibleText
{
  /**
   * Constant designating that the next selection should be a character.
   *
   * @see #getAtIndex(int, int)
   * @see #getAfterIndex(int, int)
   * @see #getBeforeIndex(int, int)
   */
  int CHARACTER = 1;

  /**
   * Constant designating that the next selection should be a word.
   *
   * @see #getAtIndex(int, int)
   * @see #getAfterIndex(int, int)
   * @see #getBeforeIndex(int, int)
   */
  int WORD = 2;

  /**
   * Constant designating that the next selection should be a sentence.
   *
   * @see #getAtIndex(int, int)
   * @see #getAfterIndex(int, int)
   * @see #getBeforeIndex(int, int)
   */
  int SENTENCE = 3;

  /**
   * Given a point in the coordinate system of this object, return the
   * 0-based index of the character at that point, or -1 if there is none.
   *
   * @param p the point to look at
   * @return the character index, or -1
   */
  int getIndexAtPoint(Point point);

  /**
   * Determines the bounding box of the indexed character. Returns an empty
   * rectangle if the index is out of bounds.
   *
   * @param index the 0-based character index
   * @return the bounding box, may be empty
   */
  Rectangle getCharacterBounds(int index);

  /**
   * Return the number of characters.
   *
   * @return the character count
   */
  int getCharCount();

  /**
   * Return the offset of the character. The offset matches the index of the
   * character to the right, since the carat lies between characters.
   *
   * @return the 0-based caret position
   */
  int getCaretPosition();

  /**
   * Returns the section of text at the index, or null if the index or part
   * is invalid.
   *
   * @param part {@link CHARACTER}, {@link WORD}, or {@link SENTENCE}
   * @param index the 0-based character index
   * @return the selection of text at that index, or null
   */
  String getAtIndex(int part, int index);

  /**
   * Returns the section of text after the index, or null if the index or part
   * is invalid.
   *
   * @param part {@link CHARACTER}, {@link WORD}, or {@link SENTENCE}
   * @param index the 0-based character index
   * @return the selection of text after that index, or null
   */
  String getAfterIndex(int part, int index);

  /**
   * Returns the section of text before the index, or null if the index or part
   * is invalid.
   *
   * @param part {@link CHARACTER}, {@link WORD}, or {@link SENTENCE}
   * @param index the 0-based character index
   * @return the selection of text before that index, or null
   */
  String getBeforeIndex(int part, int index);

  /**
   * Returns the attributes of a character at an index, or null if the index
   * is out of bounds.
   *
   * @param index the 0-based character index
   * @return the character's attributes
   */
  AttributeSet getCharacterAttribute(int index);

  /**
   * Returns the start index of the selection. If there is no selection, this
   * is the same as the caret location.
   *
   * @return the 0-based character index of the selection start
   */
  int getSelectionStart();

  /**
   * Returns the end index of the selection. If there is no selection, this
   * is the same as the caret location.
   *
   * @return the 0-based character index of the selection end
   */
  int getSelectionEnd();

  /**
   * Returns the selected text. This may be null or "" if no text is selected.
   *
   * @return the selected text
   */
  String getSelectedText();
} // interface AccessibleText