org.eclipse.swt.accessibility.AccessibleAdapter Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.swt.gtk.linux.ppc64le Show documentation
Standard Widget Toolkit for GTK on ppc64le
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 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 described by the AccessibleListener interface.
 * 
 * Classes that wish to deal with AccessibleEvents can
 * extend this class and override only the methods that they are
 * interested in.
 * 

 * 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.
 * 
 *
 * @see AccessibleListener
 * @see AccessibleEvent
 * @see Sample code and further information
 *
 * @since 2.0
 */
public abstract class AccessibleAdapter implements AccessibleListener {

	/**
	 * Sent when an accessibility client requests the name
	 * of the control, or the name of a child of the control.
	 * The default behavior is to do nothing.
	 * 
	 * Return the name of the control or specified child in the
	 * result field of the event object. Returning
	 * an empty string tells the client that the control or child
	 * does not have a name, and returning null tells the client
	 * to use the platform name.
	 * 
	 *
	 * @param e an event object containing the following fields:
	 *    childID [IN] - an identifier specifying the control or one of its children
	 *    result [OUT] - the requested name string, or null
	 * 
	 */
	@Override
	public void getName(AccessibleEvent e) {
	}

	/**
	 * Sent when an accessibility client requests the help string
	 * of the control, or the help string of a child of the control.
	 * The default behavior is to do nothing.
	 * 
	 * The information in this property should be similar to the help
	 * provided by toolTipText. It describes what the control or child
	 * does or how to use it, as opposed to getDescription, which
	 * describes appearance.
	 * 

	 * Return the help string of the control or specified child in
	 * the result field of the event object. Returning
	 * an empty string tells the client that the control or child
	 * does not have a help string, and returning null tells the
	 * client to use the platform help string.
	 * 
	 *
	 * @param e an event object containing the following fields:
	 *    childID [IN] - an identifier specifying the control or one of its children
	 *    result [OUT] - the requested help string, or null
	 * 
	 */
	@Override
	public void getHelp(AccessibleEvent e) {
	}

	/**
	 * Sent when an accessibility client requests the keyboard shortcut
	 * of the control, or the keyboard shortcut of a child of the control.
	 * The default behavior is to do nothing.
	 * 
	 * A keyboard shortcut can either be a mnemonic, or an accelerator.
	 * As a general rule, if the control or child can receive keyboard focus,
	 * then you should expose its mnemonic, and if it cannot receive keyboard
	 * focus, then you should expose its accelerator.
	 * 

	 * Return the keyboard shortcut string of the control or specified child
	 * in the result field of the event object. Returning an
	 * empty string tells the client that the control or child does not
	 * have a keyboard shortcut string, and returning null tells the client
	 * to use the platform keyboard shortcut string.
	 * 
	 *
	 * @param e an event object containing the following fields:
	 *    childID [IN] - an identifier specifying the control or one of its children
	 *    result [OUT] - the requested keyboard shortcut string (example: "ALT+N"), or null
	 * 
	 */
	@Override
	public void getKeyboardShortcut(AccessibleEvent e) {
	}

	/**
	 * Sent when an accessibility client requests a description
	 * of the control, or a description of a child of the control.
	 * The default behavior is to do nothing.
	 * 
	 * This is a textual description of the control or child's visual
	 * appearance, which is typically only necessary if it cannot be
	 * determined from other properties such as role.
	 * 

	 * Return the description of the control or specified child in
	 * the result field of the event object. Returning
	 * an empty string tells the client that the control or child
	 * does not have a description, and returning null tells the
	 * client to use the platform description.
	 * 
	 *
	 * @param e an event object containing the following fields:
	 *    childID [IN] - an identifier specifying the control or one of its children
	 *    result [OUT] - the requested description string, or null
	 * 
	 */
	@Override
	public void getDescription(AccessibleEvent e) {
	}
}