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    1   /*
    2    * Copyright (c) 2005, 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   package javax.swing;
   26   
   27   import java.awt.Component;
   28   import java.awt.Container;
   29   import java.awt.Rectangle;
   30   import java.awt.event.PaintEvent;
   31   import java.security.AccessController;
   32   import sun.awt.AppContext;
   33   import sun.awt.SunToolkit;
   34   import sun.awt.event.IgnorePaintEvent;
   35   import sun.security.action.GetBooleanAction;
   36   import sun.security.action.GetPropertyAction;
   37   
   38   /**
   39    * Swing's PaintEventDispatcher.  If the component specified by the PaintEvent
   40    * is a top level Swing component (JFrame, JWindow, JDialog, JApplet), this
   41    * will forward the request to the RepaintManager for eventual painting.
   42    *
   43    */
   44   class SwingPaintEventDispatcher extends sun.awt.PaintEventDispatcher {
   45       private static final boolean SHOW_FROM_DOUBLE_BUFFER;
   46       private static final boolean ERASE_BACKGROUND;
   47   
   48       static {
   49           SHOW_FROM_DOUBLE_BUFFER = "true".equals(AccessController.doPrivileged(
   50                 new GetPropertyAction("swing.showFromDoubleBuffer", "true")));
   51           ERASE_BACKGROUND = AccessController.doPrivileged(
   52                                    new GetBooleanAction("swing.nativeErase"));
   53       }
   54   
   55       public PaintEvent createPaintEvent(Component component, int x, int y,
   56                                            int w, int h) {
   57           if (component instanceof RootPaneContainer) {
   58               AppContext appContext = SunToolkit.targetToAppContext(component);
   59               RepaintManager rm = RepaintManager.currentManager(appContext);
   60               if (!SHOW_FROM_DOUBLE_BUFFER ||
   61                     !rm.show((Container)component, x, y, w, h)) {
   62                   rm.nativeAddDirtyRegion(appContext, (Container)component,
   63                                           x, y, w, h);
   64               }
   65               // For backward compatibility generate an empty paint
   66               // event.  Not doing this broke parts of Netbeans.
   67               return new IgnorePaintEvent(component, PaintEvent.PAINT,
   68                                           new Rectangle(x, y, w, h));
   69           }
   70           else if (component instanceof SwingHeavyWeight) {
   71               AppContext appContext = SunToolkit.targetToAppContext(component);
   72               RepaintManager rm = RepaintManager.currentManager(appContext);
   73               rm.nativeAddDirtyRegion(appContext, (Container)component,
   74                                       x, y, w, h);
   75               return new IgnorePaintEvent(component, PaintEvent.PAINT,
   76                                           new Rectangle(x, y, w, h));
   77           }
   78           return super.createPaintEvent(component, x, y, w, h);
   79       }
   80   
   81       public boolean shouldDoNativeBackgroundErase(Component c) {
   82           return ERASE_BACKGROUND || !(c instanceof RootPaneContainer);
   83       }
   84   
   85       public boolean queueSurfaceDataReplacing(Component c, Runnable r) {
   86           if (c instanceof RootPaneContainer) {
   87               AppContext appContext = SunToolkit.targetToAppContext(c);
   88               RepaintManager.currentManager(appContext).
   89                       nativeQueueSurfaceDataRunnable(appContext, c, r);
   90               return true;
   91           }
   92           return super.queueSurfaceDataReplacing(c, r);
   93       }
   94   }

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