1 /*
   2  * Copyright (c) 2011, 2012, 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 java.awt.*;
  30 
  31 import java.awt.dnd.DropTarget;
  32 import java.awt.dnd.peer.DropTargetPeer;
  33 import java.awt.event.*;
  34 
  35 import java.awt.image.ColorModel;
  36 import java.awt.image.ImageObserver;
  37 import java.awt.image.ImageProducer;
  38 import java.awt.image.VolatileImage;
  39 
  40 import java.awt.peer.ComponentPeer;
  41 import java.awt.peer.ContainerPeer;
  42 
  43 import java.awt.peer.KeyboardFocusManagerPeer;
  44 import java.util.concurrent.atomic.AtomicBoolean;
  45 import java.lang.reflect.Field;
  46 import java.security.AccessController;
  47 import java.security.PrivilegedAction;
  48 
  49 import sun.awt.*;
  50 
  51 import sun.awt.event.IgnorePaintEvent;
  52 
  53 import sun.awt.image.SunVolatileImage;
  54 import sun.awt.image.ToolkitImage;
  55 
  56 import sun.java2d.SunGraphics2D;
  57 import sun.java2d.opengl.OGLRenderQueue;
  58 import sun.java2d.pipe.Region;
  59 
  60 import sun.util.logging.PlatformLogger;
  61 
  62 import javax.swing.JComponent;
  63 import javax.swing.SwingUtilities;
  64 import javax.swing.RepaintManager;
  65 
  66 import sun.lwawt.macosx.CDropTarget;
  67 
  68 import com.sun.java.swing.SwingUtilities3;
  69 
  70 public abstract class LWComponentPeer<T extends Component, D extends JComponent>
  71     implements ComponentPeer, DropTargetPeer
  72 {
  73     private static final PlatformLogger focusLog = PlatformLogger.getLogger("sun.lwawt.focus.LWComponentPeer");
  74 
  75     // State lock is to be used for modifications to this
  76     // peer's fields (e.g. bounds, background, font, etc.)
  77     // It should be the last lock in the lock chain
  78     private final Object stateLock =
  79             new StringBuilder("LWComponentPeer.stateLock");
  80 
  81     // The lock to operate with the peers hierarchy. AWT tree
  82     // lock is not used as there are many peers related ops
  83     // to be done on the toolkit thread, and we don't want to
  84     // depend on a public lock on this thread
  85     private static final Object peerTreeLock =
  86             new StringBuilder("LWComponentPeer.peerTreeLock");
  87 
  88     private final T target;
  89 
  90     // Container peer. It may not be the peer of the target's direct
  91     // parent, for example, in the case of hw/lw mixing. However,
  92     // let's skip this scenario for the time being. We also assume
  93     // the container peer is not null, which might also be false if
  94     // addNotify() is called for a component outside of the hierarchy.
  95     // The exception is LWWindowPeers: their parents are always null
  96     private LWContainerPeer containerPeer;
  97 
  98     // Handy reference to the top-level window peer. Window peer is
  99     // borrowed from the containerPeer in constructor, and should also
 100     // be updated when the component is reparented to another container
 101     private LWWindowPeer windowPeer;
 102 
 103     private final AtomicBoolean disposed = new AtomicBoolean(false);
 104 
 105     // Bounds are relative to parent peer
 106     private final Rectangle bounds = new Rectangle();
 107     private Region region;
 108 
 109     // Component state. Should be accessed under the state lock
 110     private boolean visible = false;
 111     private boolean enabled = true;
 112 
 113     private Color background;
 114     private Color foreground;
 115     private Font font;
 116 
 117     /**
 118      * Paint area to coalesce all the paint events and store the target dirty
 119      * area.
 120      */
 121     private final RepaintArea targetPaintArea;
 122 
 123     //   private volatile boolean paintPending;
 124     private volatile boolean isLayouting;
 125 
 126     private final D delegate;
 127     private Container delegateContainer;
 128     private Component delegateDropTarget;
 129     private final Object dropTargetLock = new Object();
 130 
 131     private int fNumDropTargets = 0;
 132     private CDropTarget fDropTarget = null;
 133 
 134     private final PlatformComponent platformComponent;
 135 
 136     /**
 137      * Character with reasonable value between the minimum width and maximum.
 138      */
 139     static final char WIDE_CHAR = '0';
 140 
 141     private final class DelegateContainer extends Container {
 142         {
 143             enableEvents(0xFFFFFFFF);
 144         }
 145 
 146         DelegateContainer() {
 147             super();
 148         }
 149 
 150         @Override
 151         public boolean isLightweight() {
 152             return false;
 153         }
 154 
 155         @Override
 156         public Point getLocation() {
 157             return getLocationOnScreen();
 158         }
 159 
 160         @Override
 161         public Point getLocationOnScreen() {
 162             return LWComponentPeer.this.getLocationOnScreen();
 163         }
 164 
 165         @Override
 166         public int getX() {
 167             return getLocation().x;
 168         }
 169 
 170         @Override
 171         public int getY() {
 172             return getLocation().y;
 173         }
 174     }
 175 
 176     public LWComponentPeer(T target, PlatformComponent platformComponent) {
 177         targetPaintArea = new LWRepaintArea();
 178         this.target = target;
 179         this.platformComponent = platformComponent;
 180 
 181         initializeContainerPeer();
 182         // Container peer is always null for LWWindowPeers, so
 183         // windowPeer is always null for them as well. On the other
 184         // hand, LWWindowPeer shouldn't use windowPeer at all
 185         if (containerPeer != null) {
 186             windowPeer = containerPeer.getWindowPeerOrSelf();
 187         }
 188         // don't bother about z-order here as updateZOrder()
 189         // will be called from addNotify() later anyway
 190         if (containerPeer != null) {
 191             containerPeer.addChildPeer(this);
 192         }
 193 
 194         // the delegate must be created after the target is set
 195         AWTEventListener toolkitListener = null;
 196         synchronized (Toolkit.getDefaultToolkit()) {
 197             try {
 198                 toolkitListener = getToolkitAWTEventListener();
 199                 setToolkitAWTEventListener(null);
 200 
 201                 synchronized (getDelegateLock()) {
 202                     delegate = createDelegate();
 203                     if (delegate != null) {
 204                         delegate.setVisible(false);
 205                         delegateContainer = new DelegateContainer();
 206                         delegateContainer.add(delegate);
 207                         delegateContainer.addNotify();
 208                         delegate.addNotify();
 209                         resetColorsAndFont(delegate);
 210                         delegate.setOpaque(true);
 211                     } else {
 212                         return;
 213                     }
 214                 }
 215 
 216             } finally {
 217                 setToolkitAWTEventListener(toolkitListener);
 218             }
 219 
 220             // todo swing: later on we will probably have one global RM
 221             SwingUtilities3.setDelegateRepaintManager(delegate, new RepaintManager() {
 222                 @Override
 223                 public void addDirtyRegion(final JComponent c, final int x, final int y, final int w, final int h) {
 224                     repaintPeer(SwingUtilities.convertRectangle(
 225                             c, new Rectangle(x, y, w, h), getDelegate()));
 226                 }
 227             });
 228         }
 229     }
 230 
 231     /**
 232      * This method must be called under Toolkit.getDefaultToolkit() lock
 233      * and followed by setToolkitAWTEventListener()
 234      */
 235     protected final AWTEventListener getToolkitAWTEventListener() {
 236         return AccessController.doPrivileged(new PrivilegedAction<AWTEventListener>() {
 237             public AWTEventListener run() {
 238                 Toolkit toolkit = Toolkit.getDefaultToolkit();
 239                 try {
 240                     Field field = Toolkit.class.getDeclaredField("eventListener");
 241                     field.setAccessible(true);
 242                     return (AWTEventListener) field.get(toolkit);
 243                 } catch (Exception e) {
 244                     throw new InternalError(e.toString());
 245                 }
 246             }
 247         });
 248     }
 249 
 250     protected final void setToolkitAWTEventListener(final AWTEventListener listener) {
 251         AccessController.doPrivileged(new PrivilegedAction<Void>() {
 252             public Void run() {
 253                 Toolkit toolkit = Toolkit.getDefaultToolkit();
 254                 try {
 255                     Field field = Toolkit.class.getDeclaredField("eventListener");
 256                     field.setAccessible(true);
 257                     field.set(toolkit, listener);
 258                 } catch (Exception e) {
 259                     throw new InternalError(e.toString());
 260                 }
 261                 return null;
 262             }
 263         });
 264     }
 265 
 266     /**
 267      * This method is called under getDelegateLock().
 268      * Overridden in subclasses.
 269      */
 270     protected D createDelegate() {
 271         return null;
 272     }
 273 
 274     protected final D getDelegate() {
 275         return delegate;
 276     }
 277 
 278     protected Component getDelegateFocusOwner() {
 279         return getDelegate();
 280     }
 281 
 282     /**
 283      * Initializes this peer. The call to initialize() is not placed to
 284      * LWComponentPeer ctor to let the subclass ctor to finish completely first.
 285      * Instead, it's the LWToolkit object who is responsible for initialization.
 286      * Note that we call setVisible() at the end of initialization.
 287      */
 288     public final void initialize() {
 289         platformComponent.initialize(getPlatformWindow());
 290         initializeImpl();
 291         setVisible(target.isVisible());
 292     }
 293 
 294     /**
 295      * Fetching general properties from the target. Should be overridden in
 296      * subclasses to initialize specific peers properties.
 297      */
 298     void initializeImpl() {
 299         setBackground(target.getBackground());
 300         setForeground(target.getForeground());
 301         setFont(target.getFont());
 302         setBounds(target.getBounds());
 303         setEnabled(target.isEnabled());
 304     }
 305 
 306     private static void resetColorsAndFont(final Container c) {
 307         c.setBackground(null);
 308         c.setForeground(null);
 309         c.setFont(null);
 310         for (int i = 0; i < c.getComponentCount(); i++) {
 311             resetColorsAndFont((Container) c.getComponent(i));
 312         }
 313     }
 314 
 315     final Object getStateLock() {
 316         return stateLock;
 317     }
 318 
 319     /**
 320      * Synchronize all operations with the Swing delegates under AWT tree lock,
 321      * using a new separate lock to synchronize access to delegates may lead
 322      * deadlocks. Think of it as a 'virtual EDT'.
 323      *
 324      * @return DelegateLock
 325      */
 326     final Object getDelegateLock() {
 327         return getTarget().getTreeLock();
 328     }
 329 
 330     protected static final Object getPeerTreeLock() {
 331         return peerTreeLock;
 332     }
 333 
 334     final T getTarget() {
 335         return target;
 336     }
 337 
 338     // Just a helper method
 339     // Returns the window peer or null if this is a window peer
 340     protected final LWWindowPeer getWindowPeer() {
 341         return windowPeer;
 342     }
 343 
 344     // Returns the window peer or 'this' if this is a window peer
 345     protected LWWindowPeer getWindowPeerOrSelf() {
 346         return getWindowPeer();
 347     }
 348 
 349     // Just a helper method
 350     protected final LWContainerPeer getContainerPeer() {
 351         return containerPeer;
 352     }
 353 
 354     // Just a helper method
 355     // Overridden in LWWindowPeer to skip containerPeer initialization
 356     protected void initializeContainerPeer() {
 357         Container parent = LWToolkit.getNativeContainer(target);
 358         if (parent != null) {
 359             containerPeer = (LWContainerPeer) LWToolkit.targetToPeer(parent);
 360         }
 361     }
 362 
 363     public PlatformWindow getPlatformWindow() {
 364         LWWindowPeer windowPeer = getWindowPeer();
 365         return windowPeer.getPlatformWindow();
 366     }
 367 
 368     protected AppContext getAppContext() {
 369         return SunToolkit.targetToAppContext(getTarget());
 370     }
 371 
 372     // ---- PEER METHODS ---- //
 373 
 374     @Override
 375     public Toolkit getToolkit() {
 376         return LWToolkit.getLWToolkit();
 377     }
 378 
 379     // Just a helper method
 380     public LWToolkit getLWToolkit() {
 381         return LWToolkit.getLWToolkit();
 382     }
 383 
 384     @Override
 385     public final void dispose() {
 386         if (disposed.compareAndSet(false, true)) {
 387             disposeImpl();
 388         }
 389     }
 390 
 391     protected void disposeImpl() {
 392         LWContainerPeer cp = getContainerPeer();
 393         if (cp != null) {
 394             cp.removeChildPeer(this);
 395         }
 396         platformComponent.dispose();
 397         LWToolkit.targetDisposedPeer(getTarget(), this);
 398     }
 399 
 400     public final boolean isDisposed() {
 401         return disposed.get();
 402     }
 403 
 404     /*
 405      * GraphicsConfiguration is borrowed from the parent peer. The
 406      * return value must not be null.
 407      *
 408      * Overridden in LWWindowPeer.
 409      */
 410     @Override
 411     public GraphicsConfiguration getGraphicsConfiguration() {
 412         // Don't check windowPeer for null as it can only happen
 413         // for windows, but this method is overridden in
 414         // LWWindowPeer and doesn't call super()
 415         return getWindowPeer().getGraphicsConfiguration();
 416     }
 417 
 418     /*
 419      * Overridden in LWWindowPeer to replace its surface
 420      * data and back buffer.
 421      */
 422     @Override
 423     public boolean updateGraphicsData(GraphicsConfiguration gc) {
 424         // TODO: not implemented
 425 //        throw new RuntimeException("Has not been implemented yet.");
 426         return false;
 427     }
 428 
 429     @Override
 430     public final Graphics getGraphics() {
 431         final Graphics g = getOnscreenGraphics();
 432         if (g != null) {
 433             synchronized (getPeerTreeLock()){
 434                 applyConstrain(g);
 435             }
 436         }
 437         return g;
 438     }
 439 
 440     /*
 441      * Peer Graphics is borrowed from the parent peer, while
 442      * foreground and background colors and font are specific to
 443      * this peer.
 444      */
 445     public final Graphics getOnscreenGraphics() {
 446         final LWWindowPeer wp = getWindowPeerOrSelf();
 447         return wp.getOnscreenGraphics(getForeground(), getBackground(),
 448                                       getFont());
 449 
 450     }
 451 
 452     private void applyConstrain(final Graphics g) {
 453         final SunGraphics2D sg2d = (SunGraphics2D) g;
 454         final Rectangle constr = localToWindow(getSize());
 455         // translate and set rectangle constrain.
 456         sg2d.constrain(constr.x, constr.y, constr.width, constr.height);
 457         // set region constrain.
 458         //sg2d.constrain(getVisibleRegion());
 459         SG2DConstraint(sg2d, getVisibleRegion());
 460     }
 461 
 462     //TODO Move this method to SG2D?
 463     void SG2DConstraint(final SunGraphics2D sg2d, Region r) {
 464         sg2d.constrainX = sg2d.transX;
 465         sg2d.constrainY = sg2d.transY;
 466 
 467         Region c = sg2d.constrainClip;
 468         if ((sg2d.constrainX | sg2d.constrainY) != 0) {
 469             r = r.getTranslatedRegion(sg2d.constrainX, sg2d.constrainY);
 470         }
 471         if (c == null) {
 472             c = r;
 473         } else {
 474             c = c.getIntersection(r);
 475             if (c == sg2d.constrainClip) {
 476                 // Common case to ignore
 477                 return;
 478             }
 479         }
 480         sg2d.constrainClip = c;
 481         //validateCompClip() forced call.
 482         sg2d.setDevClip(r.getLoX(), r.getLoY(), r.getWidth(), r.getHeight());
 483     }
 484 
 485     public Region getVisibleRegion() {
 486         return computeVisibleRect(this, getRegion());
 487     }
 488 
 489     static final Region computeVisibleRect(LWComponentPeer c, Region region) {
 490         final LWContainerPeer p = c.getContainerPeer();
 491         if (p != null) {
 492             final Rectangle r = c.getBounds();
 493             region = region.getTranslatedRegion(r.x, r.y);
 494             region = region.getIntersection(p.getRegion());
 495             region = region.getIntersection(p.getContentSize());
 496             region = p.cutChildren(region, c);
 497             region = computeVisibleRect(p, region);
 498             region = region.getTranslatedRegion(-r.x, -r.y);
 499         }
 500         return region;
 501     }
 502 
 503     @Override
 504     public ColorModel getColorModel() {
 505         // Is it a correct implementation?
 506         return getGraphicsConfiguration().getColorModel();
 507     }
 508 
 509     @Override
 510     public void createBuffers(int numBuffers, BufferCapabilities caps)
 511             throws AWTException {
 512         throw new AWTException("Back buffers are only supported for " +
 513                 "Window or Canvas components.");
 514     }
 515 
 516     /*
 517      * To be overridden in LWWindowPeer and LWCanvasPeer.
 518      */
 519     @Override
 520     public Image getBackBuffer() {
 521         // Return null or throw AWTException?
 522         return null;
 523     }
 524 
 525     @Override
 526     public void flip(int x1, int y1, int x2, int y2,
 527                      BufferCapabilities.FlipContents flipAction) {
 528         // Skip silently or throw AWTException?
 529     }
 530 
 531     @Override
 532     public void destroyBuffers() {
 533         // Do nothing
 534     }
 535 
 536     // Helper method
 537     public void setBounds(Rectangle r) {
 538         setBounds(r.x, r.y, r.width, r.height, SET_BOUNDS);
 539     }
 540 
 541     /**
 542      * This method could be called on the toolkit thread.
 543      */
 544     @Override
 545     public void setBounds(int x, int y, int w, int h, int op) {
 546         setBounds(x, y, w, h, op, true, false);
 547     }
 548 
 549     protected void setBounds(int x, int y, int w, int h, int op, boolean notify,
 550                              final boolean updateTarget) {
 551         Rectangle oldBounds;
 552         synchronized (getStateLock()) {
 553             oldBounds = new Rectangle(bounds);
 554             if ((op & (SET_LOCATION | SET_BOUNDS)) != 0) {
 555                 bounds.x = x;
 556                 bounds.y = y;
 557             }
 558             if ((op & (SET_SIZE | SET_BOUNDS)) != 0) {
 559                 bounds.width = w;
 560                 bounds.height = h;
 561             }
 562         }
 563         boolean moved = (oldBounds.x != x) || (oldBounds.y != y);
 564         boolean resized = (oldBounds.width != w) || (oldBounds.height != h);
 565         if (!moved && !resized) {
 566             return;
 567         }
 568         final D delegate = getDelegate();
 569         if (delegate != null) {
 570             synchronized (getDelegateLock()) {
 571                 delegateContainer.setBounds(0, 0, w, h);
 572                 delegate.setBounds(delegateContainer.getBounds());
 573                 // TODO: the following means that the delegateContainer NEVER gets validated. That's WRONG!
 574                 delegate.validate();
 575             }
 576         }
 577 
 578         final Point locationInWindow = localToWindow(0, 0);
 579         platformComponent.setBounds(locationInWindow.x, locationInWindow.y, w,
 580                                     h);
 581         if (notify) {
 582             repaintOldNewBounds(oldBounds);
 583             if (resized) {
 584                 handleResize(w, h, updateTarget);
 585             }
 586             if (moved) {
 587                 handleMove(x, y, updateTarget);
 588             }
 589         }
 590     }
 591 
 592     public final Rectangle getBounds() {
 593         synchronized (getStateLock()) {
 594             // Return a copy to prevent subsequent modifications
 595             return bounds.getBounds();
 596         }
 597     }
 598 
 599     public final Rectangle getSize() {
 600         synchronized (getStateLock()) {
 601             // Return a copy to prevent subsequent modifications
 602             return new Rectangle(bounds.width, bounds.height);
 603         }
 604     }
 605 
 606     @Override
 607     public Point getLocationOnScreen() {
 608         Point windowLocation = getWindowPeer().getLocationOnScreen();
 609         Point locationInWindow = localToWindow(0, 0);
 610         return new Point(windowLocation.x + locationInWindow.x,
 611                 windowLocation.y + locationInWindow.y);
 612     }
 613 
 614     /**
 615      * Returns the cursor of the peer, which is cursor of the target by default,
 616      * but peer can override this behavior.
 617      *
 618      * @param p Point relative to the peer.
 619      * @return Cursor of the peer or null if default cursor should be used.
 620      */
 621     protected Cursor getCursor(final Point p) {
 622         return getTarget().getCursor();
 623     }
 624 
 625     @Override
 626     public void setBackground(final Color c) {
 627         final Color oldBg = getBackground();
 628         if (oldBg == c || (oldBg != null && oldBg.equals(c))) {
 629             return;
 630         }
 631         synchronized (getStateLock()) {
 632             background = c;
 633         }
 634         final D delegate = getDelegate();
 635         if (delegate != null) {
 636             synchronized (getDelegateLock()) {
 637                 // delegate will repaint the target
 638                 delegate.setBackground(c);
 639             }
 640         } else {
 641             repaintPeer();
 642         }
 643     }
 644 
 645     protected final Color getBackground() {
 646         synchronized (getStateLock()) {
 647             return background;
 648         }
 649     }
 650 
 651     @Override
 652     public void setForeground(final Color c) {
 653         final Color oldFg = getForeground();
 654         if (oldFg == c || (oldFg != null && oldFg.equals(c))) {
 655             return;
 656         }
 657         synchronized (getStateLock()) {
 658             foreground = c;
 659         }
 660         final D delegate = getDelegate();
 661         if (delegate != null) {
 662             synchronized (getDelegateLock()) {
 663                 // delegate will repaint the target
 664                 delegate.setForeground(c);
 665             }
 666         } else {
 667             repaintPeer();
 668         }
 669     }
 670 
 671     protected final Color getForeground() {
 672         synchronized (getStateLock()) {
 673             return foreground;
 674         }
 675     }
 676 
 677     @Override
 678     public void setFont(final Font f) {
 679         final Font oldF = getFont();
 680         if (oldF == f || (oldF != null && oldF.equals(f))) {
 681             return;
 682         }
 683         synchronized (getStateLock()) {
 684             font = f;
 685         }
 686         final D delegate = getDelegate();
 687         if (delegate != null) {
 688             synchronized (getDelegateLock()) {
 689                 // delegate will repaint the target
 690                 delegate.setFont(f);
 691             }
 692         } else {
 693             repaintPeer();
 694         }
 695     }
 696 
 697     protected final Font getFont() {
 698         synchronized (getStateLock()) {
 699             return font;
 700         }
 701     }
 702 
 703     @Override
 704     public FontMetrics getFontMetrics(final Font f) {
 705         // Borrow the metrics from the top-level window
 706 //        return getWindowPeer().getFontMetrics(f);
 707         // Obtain the metrics from the offscreen window where this peer is
 708         // mostly drawn to.
 709         // TODO: check for "use platform metrics" settings
 710         final Graphics g = getOnscreenGraphics();
 711         if (g != null) {
 712             try {
 713                 return g.getFontMetrics(f);
 714             } finally {
 715                 g.dispose();
 716             }
 717         }
 718         synchronized (getDelegateLock()) {
 719             return delegateContainer.getFontMetrics(f);
 720         }
 721     }
 722 
 723     @Override
 724     public void setEnabled(final boolean e) {
 725         boolean status = e;
 726         final LWComponentPeer cp = getContainerPeer();
 727         if (cp != null) {
 728             status &= cp.isEnabled();
 729         }
 730         synchronized (getStateLock()) {
 731             if (enabled == status) {
 732                 return;
 733             }
 734             enabled = status;
 735         }
 736 
 737         final D delegate = getDelegate();
 738 
 739         if (delegate != null) {
 740             synchronized (getDelegateLock()) {
 741                 delegate.setEnabled(status);
 742             }
 743         } else {
 744             repaintPeer();
 745         }
 746     }
 747 
 748     // Helper method
 749     public final boolean isEnabled() {
 750         synchronized (getStateLock()) {
 751             return enabled;
 752         }
 753     }
 754 
 755     @Override
 756     public void setVisible(final boolean v) {
 757         synchronized (getStateLock()) {
 758             if (visible == v) {
 759                 return;
 760             }
 761             visible = v;
 762         }
 763         setVisibleImpl(v);
 764     }
 765 
 766     protected void setVisibleImpl(final boolean v) {
 767         final D delegate = getDelegate();
 768 
 769         if (delegate != null) {
 770             synchronized (getDelegateLock()) {
 771                 delegate.setVisible(v);
 772             }
 773         }
 774         if (visible) {
 775             repaintPeer();
 776         } else {
 777             repaintParent(getBounds());
 778         }
 779     }
 780 
 781     // Helper method
 782     public final boolean isVisible() {
 783         synchronized (getStateLock()) {
 784             return visible;
 785         }
 786     }
 787 
 788     @Override
 789     public void paint(final Graphics g) {
 790         getTarget().paint(g);
 791     }
 792 
 793     @Override
 794     public void print(final Graphics g) {
 795         getTarget().print(g);
 796     }
 797 
 798     @Override
 799     public void reparent(ContainerPeer newContainer) {
 800         // TODO: not implemented
 801         throw new UnsupportedOperationException("ComponentPeer.reparent()");
 802     }
 803 
 804     @Override
 805     public boolean isReparentSupported() {
 806         // TODO: not implemented
 807         return false;
 808     }
 809 
 810     @Override
 811     public void setZOrder(ComponentPeer above) {
 812         LWContainerPeer cp = getContainerPeer();
 813         // Don't check containerPeer for null as it can only happen
 814         // for windows, but this method is overridden in
 815         // LWWindowPeer and doesn't call super()
 816         cp.setChildPeerZOrder(this, (LWComponentPeer) above);
 817     }
 818 
 819     @Override
 820     public void coalescePaintEvent(PaintEvent e) {
 821         if (!(e instanceof IgnorePaintEvent)) {
 822             Rectangle r = e.getUpdateRect();
 823             if ((r != null) && !r.isEmpty()) {
 824                 targetPaintArea.add(r, e.getID());
 825             }
 826         }
 827     }
 828 
 829     /*
 830      * Should be overridden in subclasses which use complex Swing components.
 831      */
 832     @Override
 833     public void layout() {
 834         // TODO: not implemented
 835     }
 836 
 837     @Override
 838     public boolean isObscured() {
 839         // TODO: not implemented
 840         return false;
 841     }
 842 
 843     @Override
 844     public boolean canDetermineObscurity() {
 845         // TODO: not implemented
 846         return false;
 847     }
 848 
 849     /**
 850      * Determines the preferred size of the component. By default forwards the
 851      * request to the Swing helper component. Should be overridden in subclasses
 852      * if required.
 853      */
 854     @Override
 855     public Dimension getPreferredSize() {
 856         final Dimension size;
 857         synchronized (getDelegateLock()) {
 858             size = getDelegate().getPreferredSize();
 859         }
 860         return validateSize(size);
 861     }
 862 
 863     /**
 864      * Determines the minimum size of the component. By default forwards the
 865      * request to the Swing helper component. Should be overridden in subclasses
 866      * if required.
 867      */
 868     @Override
 869     public Dimension getMinimumSize() {
 870         final Dimension size;
 871         synchronized (getDelegateLock()) {
 872             size = getDelegate().getMinimumSize();
 873         }
 874         return validateSize(size);
 875     }
 876 
 877     /**
 878      * In some situations delegates can return empty minimum/preferred size.
 879      * (For example: empty JLabel, etc), but awt components never should be
 880      * empty. In the XPeers or WPeers we use some magic constants, but here we
 881      * try to use something more useful,
 882      */
 883     private Dimension validateSize(final Dimension size) {
 884         if (size.width == 0 || size.height == 0) {
 885             final FontMetrics fm = getFontMetrics(getFont());
 886             size.width = fm.charWidth(WIDE_CHAR);
 887             size.height = fm.getHeight();
 888         }
 889         return size;
 890     }
 891 
 892     @Override
 893     public void updateCursorImmediately() {
 894         getLWToolkit().getCursorManager().updateCursor();
 895     }
 896 
 897     @Override
 898     public boolean isFocusable() {
 899         // Overridden in focusable subclasses like buttons
 900         return false;
 901     }
 902 
 903     @Override
 904     public boolean requestFocus(Component lightweightChild, boolean temporary,
 905                                 boolean focusedWindowChangeAllowed, long time,
 906                                 CausedFocusEvent.Cause cause)
 907     {
 908         if (focusLog.isLoggable(PlatformLogger.FINEST)) {
 909             focusLog.finest("lightweightChild=" + lightweightChild + ", temporary=" + temporary +
 910                             ", focusedWindowChangeAllowed=" + focusedWindowChangeAllowed +
 911                             ", time= " + time + ", cause=" + cause);
 912         }
 913         if (LWKeyboardFocusManagerPeer.processSynchronousLightweightTransfer(
 914                 getTarget(), lightweightChild, temporary,
 915                 focusedWindowChangeAllowed, time)) {
 916             return true;
 917         }
 918 
 919         int result = LWKeyboardFocusManagerPeer.shouldNativelyFocusHeavyweight(
 920                 getTarget(), lightweightChild, temporary,
 921                 focusedWindowChangeAllowed, time, cause);
 922         switch (result) {
 923             case LWKeyboardFocusManagerPeer.SNFH_FAILURE:
 924                 return false;
 925             case LWKeyboardFocusManagerPeer.SNFH_SUCCESS_PROCEED:
 926                 Window parentWindow = SunToolkit.getContainingWindow(getTarget());
 927                 if (parentWindow == null) {
 928                     focusLog.fine("request rejected, parentWindow is null");
 929                     LWKeyboardFocusManagerPeer.removeLastFocusRequest(getTarget());
 930                     return false;
 931                 }
 932                 LWWindowPeer parentPeer = (LWWindowPeer) parentWindow.getPeer();
 933                 if (parentPeer == null) {
 934                     focusLog.fine("request rejected, parentPeer is null");
 935                     LWKeyboardFocusManagerPeer.removeLastFocusRequest(getTarget());
 936                     return false;
 937                 }
 938 
 939                 // A fix for 7145768. Ensure the parent window is currently natively focused.
 940                 // The more evident place to perform this check is in KFM.shouldNativelyFocusHeavyweight,
 941                 // however that is the shared code and this particular problem's reproducibility has
 942                 // platform specifics. So, it was decided to narrow down the fix to lwawt (OSX) in
 943                 // current release. TODO: consider fixing it in the shared code.
 944                 if (!focusedWindowChangeAllowed) {
 945                     LWWindowPeer decoratedPeer = parentPeer.isSimpleWindow() ?
 946                         LWWindowPeer.getOwnerFrameDialog(parentPeer) : parentPeer;
 947 
 948                     if (decoratedPeer == null || !decoratedPeer.getPlatformWindow().isActive()) {
 949                         if (focusLog.isLoggable(PlatformLogger.FINE)) {
 950                             focusLog.fine("request rejected, focusedWindowChangeAllowed==false, " +
 951                                           "decoratedPeer is inactive: " + decoratedPeer);
 952                         }
 953                         LWKeyboardFocusManagerPeer.removeLastFocusRequest(getTarget());
 954                         return false;
 955                     }
 956                 }
 957 
 958                 boolean res = parentPeer.requestWindowFocus(cause);
 959                 // If parent window can be made focused and has been made focused (synchronously)
 960                 // then we can proceed with children, otherwise we retreat
 961                 if (!res || !parentWindow.isFocused()) {
 962                     if (focusLog.isLoggable(PlatformLogger.FINE)) {
 963                         focusLog.fine("request rejected, res= " + res + ", parentWindow.isFocused()=" +
 964                                       parentWindow.isFocused());
 965                     }
 966                     LWKeyboardFocusManagerPeer.removeLastFocusRequest(getTarget());
 967                     return false;
 968                 }
 969 
 970                 KeyboardFocusManagerPeer kfmPeer = LWKeyboardFocusManagerPeer.getInstance();
 971                 Component focusOwner = kfmPeer.getCurrentFocusOwner();
 972                 return LWKeyboardFocusManagerPeer.deliverFocus(lightweightChild,
 973                         getTarget(), temporary,
 974                         focusedWindowChangeAllowed,
 975                         time, cause, focusOwner);
 976 
 977             case LWKeyboardFocusManagerPeer.SNFH_SUCCESS_HANDLED:
 978                 return true;
 979         }
 980 
 981         return false;
 982     }
 983 
 984     @Override
 985     public Image createImage(ImageProducer producer) {
 986         return new ToolkitImage(producer);
 987     }
 988 
 989     @Override
 990     public Image createImage(int w, int h) {
 991         CGraphicsConfig gc = (CGraphicsConfig)getGraphicsConfiguration();
 992         return gc.createAcceleratedImage(getTarget(), w, h);
 993     }
 994 
 995     @Override
 996     public VolatileImage createVolatileImage(int w, int h) {
 997         // TODO: is it a right/complete implementation?
 998         return new SunVolatileImage(getTarget(), w, h);
 999     }
1000 
1001     @Override
1002     public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
1003         // TODO: is it a right/complete implementation?
1004         return getToolkit().prepareImage(img, w, h, o);
1005     }
1006 
1007     @Override
1008     public int checkImage(Image img, int w, int h, ImageObserver o) {
1009         // TODO: is it a right/complete implementation?
1010         return getToolkit().checkImage(img, w, h, o);
1011     }
1012 
1013     @Override
1014     public boolean handlesWheelScrolling() {
1015         // TODO: not implemented
1016         return false;
1017     }
1018 
1019     @Override
1020     public final void applyShape(final Region shape) {
1021         synchronized (getStateLock()) {
1022             if (region == shape || (region != null && region.equals(shape))) {
1023                 return;
1024             }
1025         }
1026         applyShapeImpl(shape);
1027     }
1028 
1029     void applyShapeImpl(final Region shape) {
1030         synchronized (getStateLock()) {
1031             if (shape != null) {
1032                 region = Region.WHOLE_REGION.getIntersection(shape);
1033             } else {
1034                 region = null;
1035             }
1036         }
1037         repaintParent(getBounds());
1038     }
1039 
1040     protected final Region getRegion() {
1041         synchronized (getStateLock()) {
1042             return isShaped() ? region : Region.getInstance(getSize());
1043         }
1044     }
1045 
1046     public boolean isShaped() {
1047         synchronized (getStateLock()) {
1048             return region != null;
1049         }
1050     }
1051 
1052     // DropTargetPeer Method
1053     @Override
1054     public void addDropTarget(DropTarget dt) {
1055         LWWindowPeer winPeer = getWindowPeerOrSelf();
1056         if (winPeer != null && winPeer != this) {
1057             // We need to register the DropTarget in the
1058             // peer of the window ancestor of the component
1059             winPeer.addDropTarget(dt);
1060         } else {
1061             synchronized (dropTargetLock) {
1062                 // 10-14-02 VL: Windows WComponentPeer would add (or remove) the drop target only
1063                 // if it's the first (or last) one for the component. Otherwise this call is a no-op.
1064                 if (++fNumDropTargets == 1) {
1065                     // Having a non-null drop target would be an error but let's check just in case:
1066                     if (fDropTarget != null)
1067                         System.err.println("CComponent.addDropTarget(): current drop target is non-null.");
1068 
1069                     // Create a new drop target:
1070                     fDropTarget = CDropTarget.createDropTarget(dt, target, this);
1071                 }
1072             }
1073         }
1074     }
1075 
1076     // DropTargetPeer Method
1077     @Override
1078     public void removeDropTarget(DropTarget dt) {
1079         LWWindowPeer winPeer = getWindowPeerOrSelf();
1080         if (winPeer != null && winPeer != this) {
1081             // We need to unregister the DropTarget in the
1082             // peer of the window ancestor of the component
1083             winPeer.removeDropTarget(dt);
1084         } else {
1085             synchronized (dropTargetLock){
1086                 // 10-14-02 VL: Windows WComponentPeer would add (or remove) the drop target only
1087                 // if it's the first (or last) one for the component. Otherwise this call is a no-op.
1088                 if (--fNumDropTargets == 0) {
1089                     // Having a null drop target would be an error but let's check just in case:
1090                     if (fDropTarget != null) {
1091                         // Dispose of the drop target:
1092                         fDropTarget.dispose();
1093                         fDropTarget = null;
1094                     } else
1095                         System.err.println("CComponent.removeDropTarget(): current drop target is null.");
1096                 }
1097             }
1098         }
1099     }
1100 
1101     // ---- PEER NOTIFICATIONS ---- //
1102 
1103     /**
1104      * Called when this peer's location has been changed either as a result
1105      * of target.setLocation() or as a result of user actions (window is
1106      * dragged with mouse).
1107      *
1108      * To be overridden in LWWindowPeer to update its GraphicsConfig.
1109      *
1110      * This method could be called on the toolkit thread.
1111      */
1112     protected final void handleMove(final int x, final int y,
1113                                     final boolean updateTarget) {
1114         if (updateTarget) {
1115             AWTAccessor.getComponentAccessor().setLocation(getTarget(), x, y);
1116         }
1117         postEvent(new ComponentEvent(getTarget(),
1118                                      ComponentEvent.COMPONENT_MOVED));
1119     }
1120 
1121     /**
1122      * Called when this peer's size has been changed either as a result of
1123      * target.setSize() or as a result of user actions (window is resized).
1124      *
1125      * To be overridden in LWWindowPeer to update its SurfaceData and
1126      * GraphicsConfig.
1127      *
1128      * This method could be called on the toolkit thread.
1129      */
1130     protected final void handleResize(final int w, final int h,
1131                                       final boolean updateTarget) {
1132         if (updateTarget) {
1133             AWTAccessor.getComponentAccessor().setSize(getTarget(), w, h);
1134         }
1135         postEvent(new ComponentEvent(getTarget(),
1136                                      ComponentEvent.COMPONENT_RESIZED));
1137     }
1138 
1139     protected final void repaintOldNewBounds(final Rectangle oldB) {
1140         repaintParent(oldB);
1141         repaintPeer(getSize());
1142     }
1143 
1144     protected final void repaintParent(final Rectangle oldB) {
1145         final LWContainerPeer cp = getContainerPeer();
1146         if (cp != null) {
1147             // Repaint unobscured part of the parent
1148             cp.repaintPeer(cp.getContentSize().intersection(oldB));
1149         }
1150     }
1151 
1152     // ---- EVENTS ---- //
1153 
1154     /**
1155      * Post an event to the proper Java EDT.
1156      */
1157     public void postEvent(AWTEvent event) {
1158         SunToolkit.postEvent(getAppContext(), event);
1159     }
1160 
1161     protected void postPaintEvent(int x, int y, int w, int h) {
1162         // TODO: call getIgnoreRepaint() directly with the right ACC
1163         if (AWTAccessor.getComponentAccessor().getIgnoreRepaint(target)) {
1164             return;
1165         }
1166         PaintEvent event = PaintEventDispatcher.getPaintEventDispatcher().
1167                 createPaintEvent(getTarget(), x, y, w, h);
1168         if (event != null) {
1169             postEvent(event);
1170         }
1171     }
1172 
1173     /*
1174      * Gives a chance for the peer to handle the event after it's been
1175      * processed by the target.
1176      */
1177     @Override
1178     public void handleEvent(AWTEvent e) {
1179         if ((e instanceof InputEvent) && ((InputEvent) e).isConsumed()) {
1180             return;
1181         }
1182         switch (e.getID()) {
1183             case FocusEvent.FOCUS_GAINED:
1184             case FocusEvent.FOCUS_LOST:
1185                 handleJavaFocusEvent((FocusEvent) e);
1186                 break;
1187             case PaintEvent.PAINT:
1188                 // Got a native paint event
1189 //                paintPending = false;
1190                 // fall through to the next statement
1191             case PaintEvent.UPDATE:
1192                 handleJavaPaintEvent();
1193                 break;
1194             case MouseEvent.MOUSE_PRESSED:
1195                 handleJavaMouseEvent((MouseEvent)e);
1196         }
1197 
1198         sendEventToDelegate(e);
1199     }
1200 
1201     private void sendEventToDelegate(final AWTEvent e) {
1202         synchronized (getDelegateLock()) {
1203             if (getDelegate() == null || !isShowing() || !isEnabled()) {
1204                 return;
1205             }
1206             AWTEvent delegateEvent = createDelegateEvent(e);
1207             if (delegateEvent != null) {
1208                 AWTAccessor.getComponentAccessor()
1209                         .processEvent((Component) delegateEvent.getSource(),
1210                                 delegateEvent);
1211                 if (delegateEvent instanceof KeyEvent) {
1212                     KeyEvent ke = (KeyEvent) delegateEvent;
1213                     SwingUtilities.processKeyBindings(ke);
1214                 }
1215             }
1216         }
1217     }
1218 
1219     protected AWTEvent createDelegateEvent(AWTEvent e) {
1220         AWTEvent delegateEvent = null;
1221         if (e instanceof MouseWheelEvent) {
1222             MouseWheelEvent me = (MouseWheelEvent) e;
1223             delegateEvent = new MouseWheelEvent(
1224                     delegate, me.getID(), me.getWhen(),
1225                     me.getModifiers(),
1226                     me.getX(), me.getY(),
1227                     me.getClickCount(),
1228                     me.isPopupTrigger(),
1229                     me.getScrollType(),
1230                     me.getScrollAmount(),
1231                     me.getWheelRotation());
1232         } else if (e instanceof MouseEvent) {
1233             MouseEvent me = (MouseEvent) e;
1234 
1235             Component eventTarget = SwingUtilities.getDeepestComponentAt(delegate, me.getX(), me.getY());
1236 
1237             if (me.getID() == MouseEvent.MOUSE_DRAGGED) {
1238                 if (delegateDropTarget == null) {
1239                     delegateDropTarget = eventTarget;
1240                 } else {
1241                     eventTarget = delegateDropTarget;
1242                 }
1243             }
1244             if (me.getID() == MouseEvent.MOUSE_RELEASED && delegateDropTarget != null) {
1245                 eventTarget = delegateDropTarget;
1246                 delegateDropTarget = null;
1247             }
1248             if (eventTarget == null) {
1249                 eventTarget = delegate;
1250             }
1251             delegateEvent = SwingUtilities.convertMouseEvent(getTarget(), me, eventTarget);
1252         } else if (e instanceof KeyEvent) {
1253             KeyEvent ke = (KeyEvent) e;
1254             delegateEvent = new KeyEvent(getDelegateFocusOwner(), ke.getID(), ke.getWhen(),
1255                     ke.getModifiers(), ke.getKeyCode(), ke.getKeyChar(), ke.getKeyLocation());
1256         } else if (e instanceof FocusEvent) {
1257             FocusEvent fe = (FocusEvent) e;
1258             delegateEvent = new FocusEvent(getDelegateFocusOwner(), fe.getID(), fe.isTemporary());
1259         }
1260         return delegateEvent;
1261     }
1262 
1263     protected void handleJavaMouseEvent(MouseEvent e) {
1264         Component target = getTarget();
1265         assert (e.getSource() == target);
1266 
1267         if (!target.isFocusOwner() && LWKeyboardFocusManagerPeer.shouldFocusOnClick(target)) {
1268             LWKeyboardFocusManagerPeer.requestFocusFor(target, CausedFocusEvent.Cause.MOUSE_EVENT);
1269         }
1270     }
1271 
1272     /**
1273      * Handler for FocusEvents.
1274      */
1275     protected void handleJavaFocusEvent(FocusEvent e) {
1276         // Note that the peer receives all the FocusEvents from
1277         // its lightweight children as well
1278         KeyboardFocusManagerPeer kfmPeer = LWKeyboardFocusManagerPeer.getInstance();
1279         kfmPeer.setCurrentFocusOwner(e.getID() == FocusEvent.FOCUS_GAINED ? getTarget() : null);
1280     }
1281 
1282     /**
1283      * All peers should clear background before paint.
1284      *
1285      * @return false on components that DO NOT require a clearRect() before
1286      *         painting.
1287      */
1288     protected final boolean shouldClearRectBeforePaint() {
1289         // TODO: sun.awt.noerasebackground
1290         return true;
1291     }
1292 
1293     /**
1294      * Handler for PAINT and UPDATE PaintEvents.
1295      */
1296     private void handleJavaPaintEvent() {
1297         // Skip all painting while layouting and all UPDATEs
1298         // while waiting for native paint
1299 //        if (!isLayouting && !paintPending) {
1300         if (!isLayouting()) {
1301             targetPaintArea.paint(getTarget(), shouldClearRectBeforePaint());
1302         }
1303     }
1304 
1305     // ---- UTILITY METHODS ---- //
1306 
1307     /**
1308      * Finds a top-most visible component for the given point. The location is
1309      * specified relative to the peer's parent.
1310      */
1311     public LWComponentPeer findPeerAt(final int x, final int y) {
1312         final Rectangle r = getBounds();
1313         final Region sh = getRegion();
1314         final boolean found = isVisible() && sh.contains(x - r.x, y - r.y);
1315         return found ? this : null;
1316     }
1317 
1318     /*
1319      * Translated the given point in Window coordinates to the point in
1320      * coordinates local to this component. The given window peer must be
1321      * the window where this component is in.
1322      */
1323     public Point windowToLocal(int x, int y, LWWindowPeer wp) {
1324         return windowToLocal(new Point(x, y), wp);
1325     }
1326 
1327     public Point windowToLocal(Point p, LWWindowPeer wp) {
1328         LWComponentPeer cp = this;
1329         while (cp != wp) {
1330             Rectangle cpb = cp.getBounds();
1331             p.x -= cpb.x;
1332             p.y -= cpb.y;
1333             cp = cp.getContainerPeer();
1334         }
1335         // Return a copy to prevent subsequent modifications
1336         return new Point(p);
1337     }
1338 
1339     public Rectangle windowToLocal(Rectangle r, LWWindowPeer wp) {
1340         Point p = windowToLocal(r.getLocation(), wp);
1341         return new Rectangle(p, r.getSize());
1342     }
1343 
1344     public Point localToWindow(int x, int y) {
1345         return localToWindow(new Point(x, y));
1346     }
1347 
1348     public Point localToWindow(Point p) {
1349         LWComponentPeer cp = getContainerPeer();
1350         Rectangle r = getBounds();
1351         while (cp != null) {
1352             p.x += r.x;
1353             p.y += r.y;
1354             r = cp.getBounds();
1355             cp = cp.getContainerPeer();
1356         }
1357         // Return a copy to prevent subsequent modifications
1358         return new Point(p);
1359     }
1360 
1361     public Rectangle localToWindow(Rectangle r) {
1362         Point p = localToWindow(r.getLocation());
1363         return new Rectangle(p, r.getSize());
1364     }
1365 
1366     public final void repaintPeer() {
1367         repaintPeer(getSize());
1368     }
1369 
1370     public void repaintPeer(final Rectangle r) {
1371         final Rectangle toPaint = getSize().intersection(r);
1372         if (!isShowing() || toPaint.isEmpty()) {
1373             return;
1374         }
1375 
1376         postPaintEvent(toPaint.x, toPaint.y, toPaint.width, toPaint.height);
1377     }
1378 
1379     /**
1380      * Determines whether this peer is showing on screen. This means that the
1381      * peer must be visible, and it must be in a container that is visible and
1382      * showing.
1383      *
1384      * @see #isVisible()
1385      */
1386     protected final boolean isShowing() {
1387         synchronized (getPeerTreeLock()) {
1388             if (isVisible()) {
1389                 final LWContainerPeer container = getContainerPeer();
1390                 return (container == null) || container.isShowing();
1391             }
1392         }
1393         return false;
1394     }
1395 
1396     /**
1397      * Paints the peer. Overridden in subclasses to delegate the actual painting
1398      * to Swing components.
1399      */
1400     protected final void paintPeer(final Graphics g) {
1401         final D delegate = getDelegate();
1402         if (delegate != null) {
1403             if (!SwingUtilities.isEventDispatchThread()) {
1404                 throw new InternalError("Painting must be done on EDT");
1405             }
1406             synchronized (getDelegateLock()) {
1407                 // JComponent.print() is guaranteed to not affect the double buffer
1408                 getDelegate().print(g);
1409             }
1410         }
1411     }
1412 
1413     protected static final void flushOnscreenGraphics(){
1414         final OGLRenderQueue rq = OGLRenderQueue.getInstance();
1415         rq.lock();
1416         try {
1417             rq.flushNow();
1418         } finally {
1419             rq.unlock();
1420         }
1421     }
1422 
1423     /**
1424      * Used by ContainerPeer to skip all the paint events during layout.
1425      *
1426      * @param isLayouting layouting state.
1427      */
1428     protected final void setLayouting(final boolean isLayouting) {
1429         this.isLayouting = isLayouting;
1430     }
1431 
1432     /**
1433      * Returns layouting state. Used by ComponentPeer to skip all the paint
1434      * events during layout.
1435      *
1436      * @return true during layout, false otherwise.
1437      */
1438     private final boolean isLayouting() {
1439         return isLayouting;
1440     }
1441 }