/*
 * @(#)AccessibleExtendedText.java	1.2 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
 
package javax.accessibility;
 
 
import java.util.*;
import java.awt.*;
import javax.swing.text.*;
 
 
/**
 * <P>The AccessibleExtendedText interface contains additional methods
 * not provided by the AccessibleText interface
 *  
 * Applications can determine if an object supports the AccessibleExtendedText
 * interface by first obtaining its AccessibleContext (see {@link Accessible})
 * and then calling the {@link AccessibleContext#getAccessibleText} method of
 * AccessibleContext.  If the return value is an instance of
 * AccessibleExtendedText, the object supports this interface.
 *
 * @see Accessible
 * @see Accessible#getAccessibleContext
 * @see AccessibleContext
 * @see AccessibleContext#getAccessibleText
 * @see AccessibleText.AccessibleTextChunk
 *
 * @version      1.2 12/19/03
 * @author       Peter Korn
 * @author       Lynn Monsanto
 */
public interface AccessibleExtendedText {
 
    /**
     * Constant used to indicate that the part of the text that should be
     * retrieved is a line of text.
     *
     * @see #getAtIndex
     * @see #getAfterIndex
     * @see #getBeforeIndex
     */
    public static final int LINE = 4; // BugID: 4849720
 
    /**
     * Constant used to indicate that the part of the text that should be
     * retrieved is contiguous text with the same text attributes.
     *
     * @see #getAtIndex
     * @see #getAfterIndex
     * @see #getBeforeIndex
     */
    public static final int ATTRIBUTE_RUN = 5; // BugID: 4849720
 
    /**
     * Returns the text between two indices
     *
     * @param startIndex the start index in the text
     * @param endIndex the end index in the text
     * @return the text string if the indices are valid.
     * Otherwise, null is returned.
     */
    public String getTextRange(int startIndex, int endIndex);
 
    /**
     * Returns the AccessibleTextSequence at a given index.
     *
     * @param part the CHARACTER, WORD, SENTENCE, LINE or ATTRIBUTE_RUN to     
     * retrieve
     * @param index an index within the text
     * @return an AccessibleTextSequence specifying the text if part and index
     * are valid.  Otherwise, null is returned.
     *
     * @see AccessibleText.CHARACTER
     * @see AccessibleText.WORK
     * @see AccessibleText.SENTENCE
     */
    public AccessibleTextSequence getTextSequenceAt(int part, int index);
 
    /**
     * Returns the AccessibleTextSequence after a given index.
     *
     * @param part the CHARACTER, WORD, SENTENCE, LINE or ATTRIBUTE_RUN to
     * retrieve
     * @param index an index within the text
     * @return an AccessibleTextSequence specifying the text if part and index
     * are valid.  Otherwise, null is returned.
     *
     * @see AccessibleText.CHARACTER
     * @see AccessibleText.WORK
     * @see AccessibleText.SENTENCE
     */
    public AccessibleTextSequence getTextSequenceAfter(int part, int index);
 
    /**
     * Returns the AccessibleTextSequence before a given index.
     *
     * @param part the CHARACTER, WORD, SENTENCE, LINE or ATTRIBUTE_RUN to
     * retrieve
     * @param index an index within the text
     * @return an AccessibleTextSequence specifying the text if part and index
     * are valid.  Otherwise, null is returned.
     *
     * @see AccessibleText.CHARACTER
     * @see AccessibleText.WORK
     * @see AccessibleText.SENTENCE
     */
    public AccessibleTextSequence getTextSequenceBefore(int part, int index);
 
    /**
     * Returns the bounding rectangle of the text between two indices.
     *
     * @param startIndex the start index in the text
     * @param endIndex the end index in the text
     * @return the bounding rectangle of the text if the indices are valid.
     * Otherwise, null is returned.
     */
    public Rectangle getTextBounds(int startIndex, int endIndex);
}