/*
 * Copyright 1997-2005 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package javax.accessibility;

/**
 * The AccessibleAction interface should be supported by any object
 * that can perform one or more actions.  This interface
 * provides the standard mechanism for an assistive technology to determine
 * what those actions are as well as tell the object to perform them.
 * Any object that can be manipulated should support this
 * interface.  Applications can determine if an object supports the
 * AccessibleAction interface by first obtaining its AccessibleContext (see
 * {@link Accessible}) and then calling the {@link AccessibleContext#getAccessibleAction}
 * method.  If the return value is not null, the object supports this interface.
 *
 * @see Accessible
 * @see Accessible#getAccessibleContext
 * @see AccessibleContext
 * @see AccessibleContext#getAccessibleAction
 *
 * @author      Peter Korn
 * @author      Hans Muller
 * @author      Willie Walker
 * @author      Lynn Monsanto
 */
public interface AccessibleAction {

    /**
     * An action which causes a tree node to
     * collapse if expanded and expand if collapsed.
     * @since 1.5
     */
    public static final String TOGGLE_EXPAND =
        new String ("toggle expand");

    /**
     * An action which increments a value.
     * @since 1.5
     */
    public static final String INCREMENT =
        new String ("increment");


    /**
     * An action which decrements a value.
     * @since 1.5
     */
    public static final String DECREMENT =
        new String ("decrement");

    /**
     * An action which causes a component to execute its default action.
     * @since 1.6
     */
    public static final String CLICK = new String("click");

    /**
     * An action which causes a popup to become visible if it is hidden and
     * hidden if it is visible.
     * @since 1.6
     */
    public static final String TOGGLE_POPUP = new String("toggle popup");

    /**
     * Returns the number of accessible actions available in this object
     * If there are more than one, the first one is considered the "default"
     * action of the object.
     *
     * @return the zero-based number of Actions in this object
     */
    public int getAccessibleActionCount();

    /**
     * Returns a description of the specified action of the object.
     *
     * @param i zero-based index of the actions
     * @return a String description of the action
     * @see #getAccessibleActionCount
     */
    public String getAccessibleActionDescription(int i);

    /**
     * Performs the specified Action on the object
     *
     * @param i zero-based index of actions
     * @return true if the action was performed; otherwise false.
     * @see #getAccessibleActionCount
     */
    public boolean doAccessibleAction(int i);
}
