/*******************************************************************************
 * Copyright (c) 2000, 2008 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
 *     
 * Port to the D programming language:
 *     Jacob Carlborg <doob@me.com>
 *******************************************************************************/
module dwt.accessibility.AccessibleControlAdapter;

import dwt.dwthelper.utils;
import dwt.accessibility.AccessibleControlListener;
import dwt.accessibility.AccessibleControlEvent;

/**
 * This adapter class provides default implementations for the
 * methods described by the <code>AccessibleControlListener</code> interface.
 * <p>
 * Classes that wish to deal with <code>AccessibleControlEvent</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 AccessibleControlListener
 * @see AccessibleControlEvent
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 * 
 * @since 2.0
 */
public abstract class AccessibleControlAdapter : AccessibleControlListener {
    
    /**
     * Sent when an accessibility client requests the identifier
     * of the control child at the specified display coordinates.
     * The default behavior is to do nothing.
     * <p>
     * Return the identifier of the child at display point (x, y)
     * in the <code>childID</code> field of the event object.
     * Return CHILDID_SELF if point (x, y) is in the control itself
     * and not in any child. Return CHILDID_NONE if point (x, y)
     * is not contained in either the control or any of its children.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>x, y [IN] - the specified point in display coordinates</li>
     *    <li>childID [Typical OUT] - the ID of the child at point, or CHILDID_SELF, or CHILDID_NONE</li>
     *    <li>accessible [Optional OUT] - the accessible object for the control or child may be returned instead of the childID</li>
     * </ul>
     */
    public void getChildAtPoint (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the location
     * of the control, or the location of a child of the control.
     * The default behavior is to do nothing.
     * <p>
     * Return a rectangle describing the location of the specified
     * control or child in the <code>x, y, width, and height</code>
     * fields of the event object.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [IN] - an identifier specifying the control or one of its children</li>
     *    <li>x, y, width, height [OUT] - the control or child location in display coordinates</li>
     * </ul>
     */
    public void getLocation (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the accessible object
     * for a child of the control.
     * The default behavior is to do nothing.
     * <p>
     * Return an <code>Accessible</code> for the specified control or
     * child in the <code>accessible</code> field of the event object.
     * Return null if the specified child does not have its own
     * <code>Accessible</code>.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [IN] - an identifier specifying a child of the control</li>
     *    <li>accessible [OUT] - an Accessible for the specified childID, or null if one does not exist</li>
     * </ul>
     */
    public void getChild (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the number of
     * children in the control.
     * The default behavior is to do nothing.
     * <p>
     * Return the number of child items in the <code>detail</code>
     * field of the event object.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>detail [OUT] - the number of child items in this control</li>
     * </ul>
     */
    public void getChildCount (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the default action
     * of the control, or the default action of a child of the control.
     * The default behavior is to do nothing.
     * <p>
     * This String is typically a verb describing what the user does to it.
     * For example, a Push Button's default action is "Press", a Check Button's
     * is "Check" or "UnCheck", and List items have the default action "Double Click".
     * </p><p>
     * Return a String describing the default action of the specified
     * control or child in the <code>result</code> field of the event object.
     * Returning null tells the client to use the platform default action String.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [IN] - an identifier specifying the control or one of its children</li>
     *    <li>result [OUT] - the requested default action String, or null</li>
     * </ul>
     */
    public void getDefaultAction (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the identity of
     * the child or control that has keyboard focus.
     * The default behavior is to do nothing.
     * <p>
     * Return the identifier of the child that has focus in the
     * <code>childID</code> field of the event object.
     * Return CHILDID_SELF if the control itself has keyboard focus.
     * Return CHILDID_NONE if neither the control nor any of its children has focus.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [Typical OUT] - the ID of the child with focus, or CHILDID_SELF, or CHILDID_NONE</li>
     *    <li>accessible [Optional OUT] - the accessible object for a child may be returned instead of its childID</li>
     * </ul>
     */
    public void getFocus (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the role
     * of the control, or the role of a child of the control.
     * The default behavior is to do nothing.
     * <p>
     * Return a role constant (constant defined in ACC beginning with ROLE_)
     * that describes the role of the specified control or child in the
     * <code>detail</code> field of the event object.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [IN] - an identifier specifying the control or one of its children</li>
     *    <li>detail [OUT] - a role constant describing the role of the control or child</li>
     * </ul>
     */
    public void getRole (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the identity of
     * the child or control that is currently selected.
     * The default behavior is to do nothing.
     * <p>
     * Return the identifier of the selected child in the
     * <code>childID</code> field of the event object.
     * Return CHILDID_SELF if the control itself is selected.
     * Return CHILDID_MULTIPLE if multiple children are selected, and return an array of childIDs in the <code>children</code> field.
     * Return CHILDID_NONE if neither the control nor any of its children are selected.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [Typical OUT] - the ID of the selected child, or CHILDID_SELF, or CHILDID_MULTIPLE, or CHILDID_NONE</li>
     *    <li>accessible [Optional OUT] - the accessible object for the control or child may be returned instead of the childID</li>
     * </ul>
     */
    public void getSelection (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the state
     * of the control, or the state of a child of the control.
     * The default behavior is to do nothing.
     * <p>
     * Return a state mask (mask bit constants defined in ACC beginning with STATE_)
     * that describes the current state of the specified control or child in the
     * <code>detail</code> field of the event object.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [IN] - an identifier specifying the control or one of its children</li>
     *    <li>detail [OUT] - a state mask describing the current state of the control or child</li>
     * </ul>
     */
    public void getState (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the value
     * of the control, or the value of a child of the control.
     * The default behavior is to do nothing.
     * <p>
     * Many controls do not return a value. Examples of controls
     * that do are: Combo returns the text String, Text returns
     * its contents, ProgressBar returns a String representing a
     * percentage, and Tree items return a String representing
     * their level in the tree.
     * </p><p>
     * Return a String describing the value of the specified control
     * or child in the <code>result</code> field of the event object.
     * Returning null tells the client to use the platform value String.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>childID [IN] - an identifier specifying the control or one of its children</li>
     *    <li>result [OUT] - the requested value String, or null</li>
     * </ul>
     */
    public void getValue (AccessibleControlEvent e) {
    }
    
    /**
     * Sent when an accessibility client requests the children of the control.
     * The default behavior is to do nothing.
     * <p>
     * Return the children as an array of childIDs in the <code>children</code>
     * field of the event object.
     * </p>
     *
     * @param e an event object containing the following fields:<ul>
     *    <li>children [Typical OUT] - an array of childIDs</li>
     *    <li>accessible [Optional OUT] - an array of accessible objects for the children may be returned instead of the childIDs</li>
     * </ul>
     */
    public void getChildren (AccessibleControlEvent e) {
    }
}