/*
 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.awt;

import java.awt.event.FocusEvent;
import java.awt.Component;

This class represents FocusEvents with a known "cause" - reason why this event happened. It can
be mouse press, traversal, activation, and so on - all causes are described as Cause enum. The
event with the cause can be constructed in two ways - explicitly through constructor of
CausedFocusEvent class or implicitly, by calling appropriate requestFocusXXX method with "cause"
parameter. The default cause is UNKNOWN.
/**
 * This class represents FocusEvents with a known "cause" - reason why this event happened. It can
 * be mouse press, traversal, activation, and so on - all causes are described as Cause enum. The
 * event with the cause can be constructed in two ways - explicitly through constructor of
 * CausedFocusEvent class or implicitly, by calling appropriate requestFocusXXX method with "cause"
 * parameter. The default cause is UNKNOWN.
 */
@SuppressWarnings("serial")
public class CausedFocusEvent extends FocusEvent {
    public enum Cause {
        UNKNOWN,
        MOUSE_EVENT,
        TRAVERSAL,
        TRAVERSAL_UP,
        TRAVERSAL_DOWN,
        TRAVERSAL_FORWARD,
        TRAVERSAL_BACKWARD,
        MANUAL_REQUEST,
        AUTOMATIC_TRAVERSE,
        ROLLBACK,
        NATIVE_SYSTEM,
        ACTIVATION,
        CLEAR_GLOBAL_FOCUS_OWNER,
        RETARGETED
    };

    private final Cause cause;

    public Cause getCause() {
        return cause;
    }

    public String toString() {
        return "java.awt.FocusEvent[" + super.paramString() + ",cause=" + cause + "] on " + getSource();
    }

    public CausedFocusEvent(Component source, int id, boolean temporary,
                            Component opposite, Cause cause) {
        super(source, id, temporary, opposite);
        if (cause == null) {
            cause = Cause.UNKNOWN;
        }
        this.cause = cause;
    }

    
Retargets the original focus event to the new target.  If the
original focus event is CausedFocusEvent, it remains such and
cause is copied.  Otherwise, new CausedFocusEvent is created,
with cause as RETARGETED.
Returns:
retargeted event, or null if e is null/**
     * Retargets the original focus event to the new target.  If the
     * original focus event is CausedFocusEvent, it remains such and
     * cause is copied.  Otherwise, new CausedFocusEvent is created,
     * with cause as RETARGETED.
     * @return retargeted event, or null if e is null
     */
    public static FocusEvent retarget(FocusEvent e, Component newSource) {
        if (e == null) return null;

        return new CausedFocusEvent(newSource, e.getID(), e.isTemporary(), e.getOppositeComponent(),
                                    (e instanceof CausedFocusEvent) ? ((CausedFocusEvent)e).getCause() : Cause.RETARGETED);
    }
}