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/*******************************************************************************
* Copyright (c) 2000, 2003 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 described by the <code>AccessibleTextListener</code> interface.
* <p>
* Classes that wish to deal with <code>AccessibleTextEvent</code>s can
* extend this class and override only the methods that they are
* interested in.
* </p><p>
* Note: Accessibility clients use child identifiers to specify
* whether they want information about a control or one of its children.
* Child identifiers are increasing integers beginning with 0.
* The identifier CHILDID_SELF represents the control itself.
* When returning a child identifier to a client, you may use CHILDID_NONE
* to indicate that no child or control has the required information.
* </p><p>
* Note: This adapter is typically used by implementors of
* a custom control to provide very detailed information about
* the control instance to accessibility clients.
* </p>
*
* @see AccessibleTextListener
* @see AccessibleTextEvent
*
* @since 3.0
*/
public abstract class AccessibleTextAdapter implements AccessibleTextListener {
/**
* Sent when an accessibility client requests the current character offset
* of the text caret.
* The default behavior is to do nothing.
* <p>
* Return the caret offset in the <code>offset</code>
* field of the event object.
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>childID [IN] - an identifier specifying a child of the control</li>
* <li>offset [OUT] - the current offset of the text caret</li>
* </ul>
*/
public void getCaretOffset (AccessibleTextEvent e) {
}
/**
* Sent when an accessibility client requests the range of the current
* text selection.
* The default behavior is to do nothing.
* <p>
* Return the selection start offset and non-negative length in the
* <code>offset</code> and <code>length</code> fields of the event object.
* </p>
*
* @param e an event object containing the following fields:<ul>
* <li>childID [IN] - an identifier specifying a child of the control</li>
* <li>offset [OUT] - the offset of the current text selection</li>
* <li>length [OUT] - the length of the current text selection</li>
* </ul>
*/
public void getSelectionRange (AccessibleTextEvent e) {
}
}
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