1 /*
   2  * Copyright (c) 2011, 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 
  27 package sun.lwawt;
  28 
  29 import sun.awt.RepaintArea;
  30 
  31 import java.awt.Component;
  32 import java.awt.Graphics;
  33 
  34 /**
  35  * @author Sergey Bylokhov
  36  */
  37 final class LWRepaintArea extends RepaintArea {
  38 
  39     @Override
  40     protected void updateComponent(final Component comp, final Graphics g) {
  41         if (comp != null) {
  42             super.updateComponent(comp, g);
  43             flushBuffers((LWComponentPeer) comp.getPeer());
  44         }
  45     }
  46 
  47     @Override
  48     protected void paintComponent(final Component comp, final Graphics g) {
  49         if (comp != null) {
  50             final LWComponentPeer peer = (LWComponentPeer) comp.getPeer();
  51             if (peer != null) {
  52                 peer.paintPeer(g);
  53             }
  54             super.paintComponent(comp, g);
  55             flushBuffers(peer);
  56         }
  57     }
  58 
  59     private static void flushBuffers(final LWComponentPeer peer) {
  60         if (peer != null) {
  61             if (!peer.getWindowPeerOrSelf().isOpaque()) {
  62                 peer.flushOffscreenGraphics();
  63             }
  64             peer.flushOnscreenGraphics();
  65         }
  66     }
  67 }