Java 1.2 How-To/JavaHowTo.iso/3rdParty/jbuilder/unsupported/JDK1.2beta3/SOURCE/SRC.ZIP/java/awt/accessibility/AccessibleText.java

Java Source | 1998-03-20 | 5.8 KB | 181 lines

/*
 * @(#)AccessibleText.java    1.13 98/01/20
 *
 * Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
 *
 * This software is the confidential and proprietary information of Sun
 * Microsystems, Inc. ("Confidential Information").  You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Sun.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
 * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
 * THIS SOFTWARE OR ITS DERIVATIVES.
 *
 */

package java.awt.accessibility;


import java.lang.*;
import java.util.*;
import java.awt.*;
import java.awt.swing.text.*;


/**
 * <P>The AccessibleText interface should be implemented by all
 * classes that present textual information on the display.  This interface
 * provides the standard mechanism for an assistive technology to access
 * that text via its content, attributes, and spatial location.
 * Applications can determine if an object supports the AccessibleText
 * interface by first obtaining its AccessibleContext (see
 * <a href="java.awt.accessibility.Accessible.html">Accessible</a>) and
 * then calling the
 * <a href="java.awt.accessibility.AccessibleContext.html#getAccessibleText">
 * getAccessibleText</a> method of AccessibleContext.  If the return
 * value is not null, the object supports this interface.
 *
 * @see Accessible
 * @see Accessible#getAccessibleContext
 * @see AccessibleContext
 * @see AccessibleContext#getAccessibleText
 *
 * @version    1.13 01/20/98 07:53:43
 * @author    Peter Korn
 */
public interface AccessibleText {

    /**
     * Constant used to indicate that the part of text that should be
     * retrieved is a character.
     *
     * @see #getAtIndex
     * @see #getAfterIndex
     * @see #getBeforeIndex
     */
    public static final int CHARACTER = 1;

    /**
     * Constant used to indicate that the part of text that should be
     * retrieved is a word.
     *
     * @see #getAtIndex
     * @see #getAfterIndex
     * @see #getBeforeIndex
     */
    public static final int WORD = 2;

    /**
     * Constant used to indicate that the part of text that should be
     * retrieved is a sentence.
     *
     * @see #getAtIndex
     * @see #getAfterIndex
     * @see #getBeforeIndex
     */
    public static final int SENTENCE = 3;

    /**
     * Given a point in local coordinates, return the zero-based index
     * of the character under that Point.  If the point is invalid,
     * this method returns -1.
     *
     * @param p the Point in local coordinates
     * @return the zero-based index of the character under Point p; if
     * Point is invalid returns -1.
     */
    public int getIndexAtPoint(Point p);

    /**
     * Determine the bounding box of the character at the given
     * index into the string.  The bounds are returned in local
     * coordinates.  If the index is invalid an empty rectangle is returned.
     *
     * @param i the index into the String
     * @return the screen coordinates of the character's the bounding box,
     * if index is invalid returns an empty rectangle.
     */
    public Rectangle getCharacterBounds(int i);

    /**
     * Return the number of characters (valid indicies)
     *
     * @return the number of characters
     */
    public int getCharCount();

    /**
     * Return the zero-based offset of the caret.
     *
     * Note: That to the right of the caret will have the same index
     * value as the offset (the caret is between two characters).
     * @return the zero-based offset of the caret.
     */
    public int getCaretPosition();

    /**
     * Return the String at a given index.
     *
     * @param part the CHARACTER, WORD, or SENTENCE to retrieve
     * @param index an index within the text
     * @return the letter, word, or sentence
     */
    public String getAtIndex(int part, int index);

    /**
     * Return the String after a given index.
     *
     * @param part the CHARACTER, WORD, or SENTENCE to retrieve
     * @param index an index within the text
     * @return the letter, word, or sentence
     */
    public String getAfterIndex(int part, int index);

    /**
     * Return the String before a given index.
     *
     * @param part the CHARACTER, WORD, or SENTENCE to retrieve
     * @param index an index within the text
     * @return the letter, word, or sentence
     */
    public String getBeforeIndex(int part, int index);

    /**
     * Return the AttributeSet for a given character at a given index
     *
     * @param i the zero-based index into the text
     * @return the AttributeSet of the character
     */
    public AttributeSet getCharacterAttribute(int i);

    /**
     * Returns the start offset within the selected text.
     * If there is no selection, but there is
     * a caret, the start and end offsets will be the same.
     *
     * @return the index into the text of the start of the selection
     */
    public int getSelectionStart();

    /**
     * Returns the end offset within the selected text.
     * If there is no selection, but there is
     * a caret, the start and end offsets will be the same.
     *
     * @return the index into teh text of the end of the selection
     */
    public int getSelectionEnd();

    /**
     * Returns the portion of the text that is selected.
     *
     * @return the String portion of the text that is selected
     */
    public String getSelectedText();
}