1 /*
   2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.awt.desktop;
  27 
  28 /**
  29  * Implementors receive notification when the displays attached to the system
  30  * have entered power save sleep.
  31  * <p>
  32  * This notification is useful for discontinuing a costly animation, or
  33  * indicating that the user is no longer present on a network service.
  34  *
  35  * @since 9
  36  */
  37 public interface ScreenSleepListener extends SystemEventListener {
  38 
  39     /**
  40      * Called when the system displays have entered power save sleep.
  41      *
  42      * @param  e the screen sleep event
  43      */
  44     public void screenAboutToSleep(ScreenSleepEvent e);
  45 
  46     /**
  47      * Called when the system displays have awoken from power save sleep.
  48      *
  49      * @param  e the screen sleep event
  50      */
  51     public void screenAwoke(ScreenSleepEvent e);
  52 }