/*
 * Copyright (c) 2002, 2019, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.awt.X11;

import java.awt.AWTError;
import java.awt.AWTException;
import java.awt.Button;
import java.awt.Canvas;
import java.awt.Checkbox;
import java.awt.CheckboxMenuItem;
import java.awt.Choice;
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Desktop;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Insets;
import java.awt.JobAttributes;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.PageAttributes;
import java.awt.Panel;
import java.awt.Point;
import java.awt.PopupMenu;
import java.awt.PrintJob;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.ScrollPane;
import java.awt.Scrollbar;
import java.awt.SystemColor;
import java.awt.SystemTray;
import java.awt.Taskbar;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.Window;
import java.awt.datatransfer.Clipboard;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragGestureRecognizer;
import java.awt.dnd.DragSource;
import java.awt.dnd.InvalidDnDOperationException;
import java.awt.dnd.MouseDragGestureRecognizer;
import java.awt.dnd.peer.DragSourceContextPeer;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.font.TextAttribute;
import java.awt.im.InputMethodHighlight;
import java.awt.im.spi.InputMethodDescriptor;
import java.awt.peer.ButtonPeer;
import java.awt.peer.CanvasPeer;
import java.awt.peer.CheckboxMenuItemPeer;
import java.awt.peer.CheckboxPeer;
import java.awt.peer.ChoicePeer;
import java.awt.peer.DesktopPeer;
import java.awt.peer.DialogPeer;
import java.awt.peer.FileDialogPeer;
import java.awt.peer.FontPeer;
import java.awt.peer.FramePeer;
import java.awt.peer.KeyboardFocusManagerPeer;
import java.awt.peer.LabelPeer;
import java.awt.peer.ListPeer;
import java.awt.peer.MenuBarPeer;
import java.awt.peer.MenuItemPeer;
import java.awt.peer.MenuPeer;
import java.awt.peer.MouseInfoPeer;
import java.awt.peer.PanelPeer;
import java.awt.peer.PopupMenuPeer;
import java.awt.peer.RobotPeer;
import java.awt.peer.ScrollPanePeer;
import java.awt.peer.ScrollbarPeer;
import java.awt.peer.SystemTrayPeer;
import java.awt.peer.TaskbarPeer;
import java.awt.peer.TextAreaPeer;
import java.awt.peer.TextFieldPeer;
import java.awt.peer.TrayIconPeer;
import java.awt.peer.WindowPeer;
import java.beans.PropertyChangeListener;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Properties;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.Vector;

import javax.swing.LookAndFeel;
import javax.swing.UIDefaults;

import sun.awt.AWTAccessor;
import sun.awt.AWTPermissions;
import sun.awt.AppContext;
import sun.awt.DisplayChangedListener;
import sun.awt.LightweightFrame;
import sun.awt.SunToolkit;
import sun.awt.UNIXToolkit;
import sun.awt.X11GraphicsConfig;
import sun.awt.X11GraphicsDevice;
import sun.awt.X11GraphicsEnvironment;
import sun.awt.XSettings;
import sun.awt.datatransfer.DataTransferer;
import sun.awt.util.PerformanceLogger;
import sun.awt.util.ThreadGroupUtils;
import sun.font.FontConfigManager;
import sun.java2d.SunGraphicsEnvironment;
import sun.print.PrintJob2D;
import sun.security.action.GetBooleanAction;
import sun.security.action.GetPropertyAction;
import sun.util.logging.PlatformLogger;

import static sun.awt.X11.XlibUtil.scaleDown;

public final class XToolkit extends UNIXToolkit implements Runnable {
    private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XToolkit");
    private static final PlatformLogger eventLog = PlatformLogger.getLogger("sun.awt.X11.event.XToolkit");
    private static final PlatformLogger timeoutTaskLog = PlatformLogger.getLogger("sun.awt.X11.timeoutTask.XToolkit");
    private static final PlatformLogger keyEventLog = PlatformLogger.getLogger("sun.awt.X11.kye.XToolkit");
    private static final PlatformLogger backingStoreLog = PlatformLogger.getLogger("sun.awt.X11.backingStore.XToolkit");

    //There is 400 ms is set by default on Windows and 500 by default on KDE and GNOME.
    //We use the same hardcoded constant.
    private static final int AWT_MULTICLICK_DEFAULT_TIME = 500;

    static final boolean PRIMARY_LOOP = false;
    static final boolean SECONDARY_LOOP = true;

    private static String awtAppClassName = null;

    // the system clipboard - CLIPBOARD selection
    XClipboard clipboard;
    // the system selection - PRIMARY selection
    XClipboard selection;

    // Dynamic Layout Resize client code setting
    protected static boolean dynamicLayoutSetting = false;

    //Is it allowed to generate events assigned to extra mouse buttons.
    //Set to true by default.
    private static boolean areExtraMouseButtonsEnabled = true;

    
True when the x settings have been loaded.
/**
     * True when the x settings have been loaded.
     */
    private boolean loadedXSettings;

    
XSETTINGS for the default screen.

/**
    * XSETTINGS for the default screen.
     * <p>
     */
    private XSettings xs;

    private FontConfigManager fcManager = new FontConfigManager();

    static int arrowCursor;
    static TreeMap<Long, XBaseWindow> winMap = new TreeMap<>();
    static HashMap<Object, Object> specialPeerMap = new HashMap<>();
    static HashMap<Long, Collection<XEventDispatcher>> winToDispatcher = new HashMap<>();
    static UIDefaults uidefaults;
    static final X11GraphicsEnvironment localEnv;
    private static final X11GraphicsDevice device;
    private static final long display;
    static int awt_multiclick_time;
    static boolean securityWarningEnabled;

    
Dimensions of default virtual screen in pixels. These values are used to
limit the maximum size of the window.
/**
     * Dimensions of default virtual screen in pixels. These values are used to
     * limit the maximum size of the window.
     */
    private static volatile int maxWindowWidthInPixels = -1;
    private static volatile int maxWindowHeightInPixels = -1;

    static long awt_defaultFg; // Pixel
    private static XMouseInfoPeer xPeer;

    
Should we check "_NET_WM_STRUT/_NET_WM_STRUT_PARTIAL" during insets
calculation.
/**
     * Should we check "_NET_WM_STRUT/_NET_WM_STRUT_PARTIAL" during insets
     * calculation.
     */
    private static Boolean checkSTRUT;

    static {
        initSecurityWarning();
        if (GraphicsEnvironment.isHeadless()) {
            localEnv = null;
            device = null;
            display = 0;
        } else {
            localEnv = (X11GraphicsEnvironment) GraphicsEnvironment
                .getLocalGraphicsEnvironment();
            device = (X11GraphicsDevice) localEnv.getDefaultScreenDevice();
            display = device.getDisplay();
            setupModifierMap();
            initIDs();
            setBackingStoreType();
        }
    }

    /*
     * Return (potentially) platform specific display timeout for the
     * tray icon
     */
    static native long getTrayIconDisplayTimeout();

    private static native void initIDs();
    static native void waitForEvents(long nextTaskTime);
    static Thread toolkitThread;
    static boolean isToolkitThread() {
        return Thread.currentThread() == toolkitThread;
    }

    static void initSecurityWarning() {
        // Enable warning only for internal builds
        String runtime = AccessController.doPrivileged(
                             new GetPropertyAction("java.runtime.version"));
        securityWarningEnabled = (runtime != null && runtime.contains("internal"));
    }

    static boolean isSecurityWarningEnabled() {
        return securityWarningEnabled;
    }

    static native void awt_output_flush();

    static void  awtFUnlock() {
        awtUnlock();
        awt_output_flush();
    }


    private native void nativeLoadSystemColors(int[] systemColors);

    static UIDefaults getUIDefaults() {
        if (uidefaults == null) {
            initUIDefaults();
        }
        return uidefaults;
    }

    @Override
    public void loadSystemColors(int[] systemColors) {
        nativeLoadSystemColors(systemColors);
        MotifColorUtilities.loadSystemColors(systemColors);
    }



    static void initUIDefaults() {
        try {
            // Load Defaults from MotifLookAndFeel

            // This dummy load is necessary to get SystemColor initialized. !!!!!!
            Color c = SystemColor.text;

            LookAndFeel lnf = new XAWTLookAndFeel();
            uidefaults = lnf.getDefaults();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    
Returns the X11 Display of the default screen device.
Throws:
AWTError – thrown if local GraphicsEnvironment is null, which
        means we are in the headless environment
Returns:
X11 Display/**
     * Returns the X11 Display of the default screen device.
     *
     * @return X11 Display
     * @throws AWTError thrown if local GraphicsEnvironment is null, which
     *         means we are in the headless environment
     */
    public static long getDisplay() {
        if (localEnv == null) {
            throw new AWTError("Local GraphicsEnvironment must not be null");
        }
        return display;
    }

    public static long getDefaultRootWindow() {
        awtLock();
        try {
            long res = XlibWrapper.RootWindow(XToolkit.getDisplay(),
                XlibWrapper.DefaultScreen(XToolkit.getDisplay()));

            if (res == 0) {
               throw new IllegalStateException("Root window must not be null");
            }
            return res;
        } finally {
            awtUnlock();
        }
    }

    void init() {
        awtLock();
        try {
            XlibWrapper.XSupportsLocale();
            if (XlibWrapper.XSetLocaleModifiers("") == null) {
                log.finer("X locale modifiers are not supported, using default");
            }
            tryXKB();

            AwtScreenData defaultScreen = new AwtScreenData(XToolkit.getDefaultScreenData());
            awt_defaultFg = defaultScreen.get_blackpixel();

            arrowCursor = XlibWrapper.XCreateFontCursor(XToolkit.getDisplay(),
                XCursorFontConstants.XC_arrow);
            final String extraButtons = "sun.awt.enableExtraMouseButtons";
            AccessController.doPrivileged((PrivilegedAction<Void>) () -> {
                areExtraMouseButtonsEnabled =
                    Boolean.parseBoolean(System.getProperty(extraButtons, "true"));
                //set system property if not yet assigned
                System.setProperty(extraButtons, ""+areExtraMouseButtonsEnabled);
                return null;
            });
            // Detect display mode changes
            XlibWrapper.XSelectInput(XToolkit.getDisplay(), XToolkit.getDefaultRootWindow(), XConstants.StructureNotifyMask);
            XToolkit.addEventDispatcher(XToolkit.getDefaultRootWindow(), new XEventDispatcher() {
                @Override
                public void dispatchEvent(XEvent ev) {
                    if (ev.get_type() == XConstants.ConfigureNotify) {
                        awtUnlock();
                        try {
                            ((X11GraphicsEnvironment)GraphicsEnvironment.
                             getLocalGraphicsEnvironment()).
                                displayChanged();
                        } finally {
                            awtLock();
                        }
                    }
                }
            });
        } finally {
            awtUnlock();
        }
        PrivilegedAction<Void> a = () -> {
            Runnable r = () -> {
                XSystemTrayPeer peer = XSystemTrayPeer.getPeerInstance();
                if (peer != null) {
                    peer.dispose();
                }
                if (xs != null) {
                    ((XAWTXSettings)xs).dispose();
                }
                freeXKB();
                if (log.isLoggable(PlatformLogger.Level.FINE)) {
                    dumpPeers();
                }
            };
            String name = "XToolkt-Shutdown-Thread";
            Thread shutdownThread = new Thread(
                    ThreadGroupUtils.getRootThreadGroup(), r, name, 0, false);
            shutdownThread.setContextClassLoader(null);
            Runtime.getRuntime().addShutdownHook(shutdownThread);
            return null;
        };
        AccessController.doPrivileged(a);
    }

    static String getCorrectXIDString(String val) {
        if (val != null) {
            return val.replace('.', '-');
        } else {
            return val;
        }
    }

    static native String getEnv(String key);


    static String getAWTAppClassName() {
        return awtAppClassName;
    }

    public XToolkit() {
        super();
        if (PerformanceLogger.loggingEnabled()) {
            PerformanceLogger.setTime("XToolkit construction");
        }

        if (!GraphicsEnvironment.isHeadless()) {
            String mainClassName = null;

            StackTraceElement[] trace = (new Throwable()).getStackTrace();
            int bottom = trace.length - 1;
            if (bottom >= 0) {
                mainClassName = trace[bottom].getClassName();
            }
            if (mainClassName == null || mainClassName.isEmpty()) {
                mainClassName = "AWT";
            }
            awtAppClassName = getCorrectXIDString(mainClassName);

            init();
            XWM.init();

            toolkitThread = AccessController.doPrivileged((PrivilegedAction<Thread>) () -> {
                String name = "AWT-XAWT";
                Thread thread = new Thread(
                        ThreadGroupUtils.getRootThreadGroup(), this, name,
                        0, false);
                thread.setContextClassLoader(null);
                thread.setPriority(Thread.NORM_PRIORITY + 1);
                thread.setDaemon(true);
                return thread;
            });
            toolkitThread.start();
        }
    }

    @Override
    public ButtonPeer createButton(Button target) {
        ButtonPeer peer = new XButtonPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public FramePeer createLightweightFrame(LightweightFrame target) {
        FramePeer peer = new XLightweightFramePeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public FramePeer createFrame(Frame target) {
        FramePeer peer = new XFramePeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    static void addToWinMap(long window, XBaseWindow xwin)
    {
        synchronized(winMap) {
            winMap.put(Long.valueOf(window),xwin);
        }
    }

    static void removeFromWinMap(long window, XBaseWindow xwin) {
        synchronized(winMap) {
            winMap.remove(Long.valueOf(window));
        }
    }
    static XBaseWindow windowToXWindow(long window) {
        synchronized(winMap) {
            return winMap.get(Long.valueOf(window));
        }
    }

    static void addEventDispatcher(long window, XEventDispatcher dispatcher) {
        synchronized(winToDispatcher) {
            Long key = Long.valueOf(window);
            Collection<XEventDispatcher> dispatchers = winToDispatcher.get(key);
            if (dispatchers == null) {
                dispatchers = new Vector<>();
                winToDispatcher.put(key, dispatchers);
            }
            dispatchers.add(dispatcher);
        }
    }
    static void removeEventDispatcher(long window, XEventDispatcher dispatcher) {
        synchronized(winToDispatcher) {
            Long key = Long.valueOf(window);
            Collection<XEventDispatcher> dispatchers = winToDispatcher.get(key);
            if (dispatchers != null) {
                dispatchers.remove(dispatcher);
            }
        }
    }

    private Point lastCursorPos;

    
Returns whether there is last remembered cursor position. The position is remembered from X mouse events on our peers. The position is stored in p. 
Returns:
true, if there is remembered last cursor position,
false otherwise/**
     * Returns whether there is last remembered cursor position.  The
     * position is remembered from X mouse events on our peers.  The
     * position is stored in {@code p}.
     * @return true, if there is remembered last cursor position,
     * false otherwise
     */
    boolean getLastCursorPos(Point p) {
        awtLock();
        try {
            if (lastCursorPos == null) {
                return false;
            }
            p.setLocation(lastCursorPos);
            return true;
        } finally {
            awtUnlock();
        }
    }

    private void processGlobalMotionEvent(XEvent e, XBaseWindow win) {
        // Only our windows guaranteely generate MotionNotify, so we
        // should track enter/leave, to catch the moment when to
        // switch to XQueryPointer
        if (e.get_type() == XConstants.MotionNotify) {
            XMotionEvent ev = e.get_xmotion();
            awtLock();
            try {
                if (lastCursorPos == null) {
                    lastCursorPos = new Point(win.scaleDown(ev.get_x_root()),
                                              win.scaleDown(ev.get_y_root()));
                } else {
                    lastCursorPos.setLocation(win.scaleDown(ev.get_x_root()),
                                              win.scaleDown(ev.get_y_root()));
                }
            } finally {
                awtUnlock();
            }
        } else if (e.get_type() == XConstants.LeaveNotify) {
            // Leave from our window
            awtLock();
            try {
                lastCursorPos = null;
            } finally {
                awtUnlock();
            }
        } else if (e.get_type() == XConstants.EnterNotify) {
            // Entrance into our window
            XCrossingEvent ev = e.get_xcrossing();
            awtLock();
            try {
                if (lastCursorPos == null) {
                    lastCursorPos = new Point(win.scaleDown(ev.get_x_root()),
                                              win.scaleDown(ev.get_y_root()));
                } else {
                    lastCursorPos.setLocation(win.scaleDown(ev.get_x_root()),
                                              win.scaleDown(ev.get_y_root()));
                }
            } finally {
                awtUnlock();
            }
        }
    }

    public interface XEventListener {
        public void eventProcessed(XEvent e);
    }

    private Collection<XEventListener> listeners = new LinkedList<XEventListener>();

    public void addXEventListener(XEventListener listener) {
        synchronized (listeners) {
            listeners.add(listener);
        }
    }

    private void notifyListeners(XEvent xev) {
        synchronized (listeners) {
            if (listeners.size() == 0) return;

            XEvent copy = xev.clone();
            try {
                for (XEventListener listener : listeners) {
                    listener.eventProcessed(copy);
                }
            } finally {
                copy.dispose();
            }
        }
    }

    private void dispatchEvent(XEvent ev) {
        final XAnyEvent xany = ev.get_xany();

        XBaseWindow baseWindow = windowToXWindow(xany.get_window());
        if (baseWindow != null && (ev.get_type() == XConstants.MotionNotify
                || ev.get_type() == XConstants.EnterNotify
                || ev.get_type() == XConstants.LeaveNotify)) {
            processGlobalMotionEvent(ev, baseWindow);
        }

        if( ev.get_type() == XConstants.MappingNotify ) {
            // The 'window' field in this event is unused.
            // This application itself does nothing to initiate such an event
            // (no calls of XChangeKeyboardMapping etc.).
            // SunRay server sends this event to the application once on every
            // keyboard (not just layout) change which means, quite seldom.
            XlibWrapper.XRefreshKeyboardMapping(ev.pData);
            resetKeyboardSniffer();
            setupModifierMap();
        }
        XBaseWindow.dispatchToWindow(ev);

        Collection<XEventDispatcher> dispatchers = null;
        synchronized(winToDispatcher) {
            Long key = Long.valueOf(xany.get_window());
            dispatchers = winToDispatcher.get(key);
            if (dispatchers != null) { // Clone it to avoid synchronization during dispatching
                dispatchers = new Vector<>(dispatchers);
            }
        }
        if (dispatchers != null) {
            Iterator<XEventDispatcher> iter = dispatchers.iterator();
            while (iter.hasNext()) {
                XEventDispatcher disp = iter.next();
                disp.dispatchEvent(ev);
            }
        }
        notifyListeners(ev);
    }

    static void processException(Throwable thr) {
        if (log.isLoggable(PlatformLogger.Level.WARNING)) {
            log.warning("Exception on Toolkit thread", thr);
        }
    }

    static native void awt_toolkit_init();

    @Override
    public void run() {
        awt_toolkit_init();
        run(PRIMARY_LOOP);
    }

    public void run(boolean loop)
    {
        XEvent ev = new XEvent();
        while(true) {
            // Fix for 6829923: we should gracefully handle toolkit thread interruption
            if (Thread.currentThread().isInterrupted()) {
                // We expect interruption from the AppContext.dispose() method only.
                // If the thread is interrupted from another place, let's skip it
                // for compatibility reasons. Probably some time later we'll remove
                // the check for AppContext.isDisposed() and will unconditionally
                // break the loop here.
                if (AppContext.getAppContext().isDisposed()) {
                    break;
                }
            }
            awtLock();
            try {
                if (loop == SECONDARY_LOOP) {
                    // In the secondary loop we may have already acquired awt_lock
                    // several times, so waitForEvents() might be unable to release
                    // the awt_lock and this causes lock up.
                    // For now, we just avoid waitForEvents in the secondary loop.
                    if (!XlibWrapper.XNextSecondaryLoopEvent(getDisplay(),ev.pData)) {
                        break;
                    }
                } else {
                    callTimeoutTasks();
                    // If no events are queued, waitForEvents() causes calls to
                    // awtUnlock(), awtJNI_ThreadYield, poll, awtLock(),
                    // so it spends most of its time in poll, without holding the lock.
                    while ((XlibWrapper.XEventsQueued(getDisplay(), XConstants.QueuedAfterReading) == 0) &&
                           (XlibWrapper.XEventsQueued(getDisplay(), XConstants.QueuedAfterFlush) == 0)) {
                        callTimeoutTasks();
                        waitForEvents(getNextTaskTime());
                    }
                    XlibWrapper.XNextEvent(getDisplay(),ev.pData);
                }

                if (ev.get_type() != XConstants.NoExpose) {
                    eventNumber++;
                }
                if (awt_UseXKB_Calls && ev.get_type() ==  awt_XKBBaseEventCode) {
                    processXkbChanges(ev);
                }

                if (XDropTargetEventProcessor.processEvent(ev) ||
                    XDragSourceContextPeer.processEvent(ev)) {
                    continue;
                }

                if (eventLog.isLoggable(PlatformLogger.Level.FINER)) {
                    eventLog.finer("{0}", ev);
                }

                // Check if input method consumes the event
                long w = 0;
                if (windowToXWindow(ev.get_xany().get_window()) != null) {
                    Component owner =
                        XKeyboardFocusManagerPeer.getInstance().getCurrentFocusOwner();
                    if (owner != null) {
                        XWindow ownerWindow = AWTAccessor.getComponentAccessor().getPeer(owner);
                        if (ownerWindow != null) {
                            w = ownerWindow.getContentWindow();
                        }
                    }
                }
                if (keyEventLog.isLoggable(PlatformLogger.Level.FINE) && (
                        ev.get_type() == XConstants.KeyPress
                                || ev.get_type() == XConstants.KeyRelease)) {
                    keyEventLog.fine("before XFilterEvent:" + ev);
                }
                if (XlibWrapper.XFilterEvent(ev.getPData(), w)) {
                    continue;
                }
                if (keyEventLog.isLoggable(PlatformLogger.Level.FINE) && (
                        ev.get_type() == XConstants.KeyPress
                                || ev.get_type() == XConstants.KeyRelease)) {
                    keyEventLog.fine(
                            "after XFilterEvent:" + ev); // IS THIS CORRECT?
                }

                dispatchEvent(ev);
            } catch (ThreadDeath td) {
                XBaseWindow.ungrabInput();
                return;
            } catch (Throwable thr) {
                XBaseWindow.ungrabInput();
                processException(thr);
            } finally {
                awtUnlock();
            }
        }
    }

    
Listener installed to detect display changes.
/**
     * Listener installed to detect display changes.
     */
    private static final DisplayChangedListener displayChangedHandler =
            new DisplayChangedListener() {
                @Override
                public void displayChanged() {
                    // 7045370: Reset the cached values
                    XToolkit.maxWindowWidthInPixels = -1;
                    XToolkit.maxWindowHeightInPixels = -1;
                }

                @Override
                public void paletteChanged() {
                }
            };

    static {
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        if (ge instanceof SunGraphicsEnvironment) {
            ((SunGraphicsEnvironment) ge).addDisplayChangedListener(
                    displayChangedHandler);
        }
    }

    private static void initScreenSize() {
        if (maxWindowWidthInPixels == -1 || maxWindowHeightInPixels == -1) {
            awtLock();
            try {
                XWindowAttributes pattr = new XWindowAttributes();
                try {
                    XlibWrapper.XGetWindowAttributes(XToolkit.getDisplay(),
                                                     XToolkit.getDefaultRootWindow(),
                                                     pattr.pData);
                    maxWindowWidthInPixels = pattr.get_width();
                    maxWindowHeightInPixels = pattr.get_height();
                } finally {
                    pattr.dispose();
                }
            } finally {
                awtUnlock();
            }
        }
    }

    static int getMaxWindowWidthInPixels() {
        initScreenSize();
        return maxWindowWidthInPixels;
    }

    static int getMaxWindowHeightInPixels() {
        initScreenSize();
        return maxWindowHeightInPixels;
    }

    private static Rectangle getWorkArea(long root, int scale)
    {
        XAtom XA_NET_WORKAREA = XAtom.get("_NET_WORKAREA");

        long native_ptr = Native.allocateLongArray(4);
        try
        {
            boolean workareaPresent = XA_NET_WORKAREA.getAtomData(root,
                XAtom.XA_CARDINAL, native_ptr, 4);
            if (workareaPresent)
            {
                int rootX = (int)Native.getLong(native_ptr, 0);
                int rootY = (int)Native.getLong(native_ptr, 1);
                int rootWidth = (int)Native.getLong(native_ptr, 2);
                int rootHeight = (int)Native.getLong(native_ptr, 3);

                return new Rectangle(scaleDown(rootX, scale),
                                     scaleDown(rootY, scale),
                                     scaleDown(rootWidth, scale),
                                     scaleDown(rootHeight, scale));
            }
        }
        finally
        {
            XlibWrapper.unsafe.freeMemory(native_ptr);
        }

        return null;
    }

    /*
     * If the current window manager supports _NET protocol then the screen
     * insets are calculated using _NET_WORKAREA property of the root window.
     * <p>
     * Note that _NET_WORKAREA is a rectangular area and it does not work
     * well in the Xinerama mode.
     * <p>
     * We will trust the part of this rectangular area only if it starts at the
     * requested graphics configuration. Below is an example when the
     * _NET_WORKAREA intersects with the requested graphics configuration but
     * produces wrong result.
     *
     *         //<-x1,y1///////
     *         //            // ////////////////
     *         //  SCREEN1   // // SCREEN2    //
     *         // ********** // //     x2,y2->//
     *         //////////////// //            //
     *                          ////////////////
     *
     * When two screens overlap and the first contains a dock(*****), then
     * _NET_WORKAREA may start at point x1,y1 and end at point x2,y2.
     */
    @Override
    public Insets getScreenInsets(GraphicsConfiguration gc)
    {
        XNETProtocol netProto = XWM.getWM().getNETProtocol();
        if ((netProto == null) || !netProto.active())
        {
            return super.getScreenInsets(gc);
        }

        XToolkit.awtLock();
        try
        {
            X11GraphicsEnvironment x11ge = (X11GraphicsEnvironment)
                    GraphicsEnvironment.getLocalGraphicsEnvironment();
            X11GraphicsConfig x11gc = (X11GraphicsConfig) gc;
            long root = XlibUtil.getRootWindow(x11gc.getDevice().getScreen());
            int scale = x11gc.getScale();
            if (x11ge.runningXinerama() && checkSTRUT()) {
                // implementation based on _NET_WM_STRUT/_NET_WM_STRUT_PARTIAL
                Rectangle rootBounds = XlibUtil.getWindowGeometry(root, scale);
                Insets insets = getScreenInsetsManually(root, rootBounds,
                                                        gc.getBounds(), scale);
                if ((insets.left | insets.top | insets.bottom | insets.right) != 0
                        || rootBounds == null) {
                    return insets;
                }
            }
            Rectangle workArea = XToolkit.getWorkArea(root, scale);
            Rectangle screen = gc.getBounds();
            if (workArea != null && screen.contains(workArea.getLocation())) {
                workArea = workArea.intersection(screen);
                int top = workArea.y - screen.y;
                int left = workArea.x - screen.x;
                int bottom = screen.height - workArea.height - top;
                int right = screen.width - workArea.width - left;
                return new Insets(top, left, bottom, right);
            }
            // Note that it is better to return zeros than inadequate values
            return new Insets(0, 0, 0, 0);
        }
        finally
        {
            XToolkit.awtUnlock();
        }
    }

    
Returns the value of "sun.awt.X11.checkSTRUT" property. Default value is false. /**
     * Returns the value of "sun.awt.X11.checkSTRUT" property. Default value is
     * {@code false}.
     */
    private static boolean checkSTRUT() {
        if (checkSTRUT == null) {
            checkSTRUT = AccessController.doPrivileged(
                    new GetBooleanAction("sun.awt.X11.checkSTRUT"));
        }
        return checkSTRUT;
    }

    /*
     * Manual calculation of screen insets: get all the windows with
     * _NET_WM_STRUT/_NET_WM_STRUT_PARTIAL hints and add these
     * hints' values to screen insets.
     *
     * This method should be called under XToolkit.awtLock()
     *
     * This method is unused by default because of two reasons:
     *  - Iteration over windows may be extremely slow, and execution of
     *    getScreenInsets() can be x100 slower than in one monitor config.
     *  - _NET_WM_STRUT/_NET_WM_STRUT_PARTIAL are hints for the applications.
     *    WM should take into account these hints when "_NET_WORKAREA" is
     *    calculated, but the system panels do not necessarily contain these
     *    hints(Gnome 3 for example).
     */
    private Insets getScreenInsetsManually(long root, Rectangle rootBounds,
                                           Rectangle screenBounds, int scale)
    {
        /*
         * During the manual calculation of screen insets we iterate
         * all the X windows hierarchy starting from root window. This
         * constant is the max level inspected in this hierarchy.
         * 3 is a heuristic value: I suppose any the toolbar-like
         * window is a child of either root or desktop window.
         */
        final int MAX_NESTED_LEVEL = 3;

        XAtom XA_NET_WM_STRUT = XAtom.get("_NET_WM_STRUT");
        XAtom XA_NET_WM_STRUT_PARTIAL = XAtom.get("_NET_WM_STRUT_PARTIAL");

        Insets insets = new Insets(0, 0, 0, 0);

        java.util.List<Object> search = new LinkedList<>();
        search.add(root);
        search.add(0);
        while (!search.isEmpty())
        {
            long window = (Long)search.remove(0);
            int windowLevel = (Integer)search.remove(0);

            /*
             * Note that most of the modern window managers unmap
             * application window if it is iconified. Thus, any
             * _NET_WM_STRUT[_PARTIAL] hints for iconified windows
             * are not included to the screen insets.
             */
            if (XlibUtil.getWindowMapState(window) == XConstants.IsUnmapped)
            {
                continue;
            }

            long native_ptr = Native.allocateLongArray(4);
            try
            {
                // first, check if _NET_WM_STRUT or _NET_WM_STRUT_PARTIAL are present
                // if both are set on the window, _NET_WM_STRUT_PARTIAL is used (see _NET spec)
                boolean strutPresent = XA_NET_WM_STRUT_PARTIAL.getAtomData(window, XAtom.XA_CARDINAL, native_ptr, 4);
                if (!strutPresent)
                {
                    strutPresent = XA_NET_WM_STRUT.getAtomData(window, XAtom.XA_CARDINAL, native_ptr, 4);
                }
                if (strutPresent)
                {
                    // second, verify that window is located on the proper screen
                    Rectangle windowBounds = XlibUtil.getWindowGeometry(window,
                                                                        scale);
                    if (windowLevel > 1)
                    {
                        windowBounds = XlibUtil.translateCoordinates(window, root,
                                                                     windowBounds,
                                                                     scale);
                    }
                    // if _NET_WM_STRUT_PARTIAL is present, we should use its values to detect
                    // if the struts area intersects with screenBounds, however some window
                    // managers don't set this hint correctly, so we just get intersection with windowBounds
                    if (windowBounds != null && windowBounds.intersects(screenBounds))
                    {
                        int left = scaleDown((int)Native.getLong(native_ptr, 0), scale);
                        int right = scaleDown((int)Native.getLong(native_ptr, 1), scale);
                        int top = scaleDown((int)Native.getLong(native_ptr, 2), scale);
                        int bottom = scaleDown((int)Native.getLong(native_ptr, 3), scale);

                        /*
                         * struts could be relative to root window bounds, so
                         * make them relative to the screen bounds in this case
                         */
                        left = rootBounds.x + left > screenBounds.x ?
                                rootBounds.x + left - screenBounds.x : 0;
                        right = rootBounds.x + rootBounds.width - right <
                                screenBounds.x + screenBounds.width ?
                                screenBounds.x + screenBounds.width -
                                (rootBounds.x + rootBounds.width - right) : 0;
                        top = rootBounds.y + top > screenBounds.y ?
                                rootBounds.y + top - screenBounds.y : 0;
                        bottom = rootBounds.y + rootBounds.height - bottom <
                                screenBounds.y + screenBounds.height ?
                                screenBounds.y + screenBounds.height -
                                (rootBounds.y + rootBounds.height - bottom) : 0;

                        insets.left = Math.max(left, insets.left);
                        insets.right = Math.max(right, insets.right);
                        insets.top = Math.max(top, insets.top);
                        insets.bottom = Math.max(bottom, insets.bottom);
                    }
                }
            }
            finally
            {
                XlibWrapper.unsafe.freeMemory(native_ptr);
            }

            if (windowLevel < MAX_NESTED_LEVEL)
            {
                Set<Long> children = XlibUtil.getChildWindows(window);
                for (long child : children)
                {
                    search.add(child);
                    search.add(windowLevel + 1);
                }
            }
        }

        return insets;
    }

    /*
     * The current implementation of disabling background erasing for
     * canvases is that we don't set any native background color
     * (with XSetWindowBackground) for the canvas window. However,
     * this color is set in the peer constructor - see
     * XWindow.postInit() for details. That's why this method from
     * SunToolkit is not overridden in XToolkit: it's too late to
     * disable background erasing :(
     */
    /*
    @Override
    public void disableBackgroundErase(Canvas canvas) {
        XCanvasPeer peer = (XCanvasPeer)canvas.getPeer();
        if (peer == null) {
            throw new IllegalStateException("Canvas must have a valid peer");
        }
        peer.disableBackgroundErase();
    }
    */

    // Need this for XMenuItemPeer.
    protected static Object targetToPeer(Object target) {
        Object p=null;
        if (target != null && !GraphicsEnvironment.isHeadless()) {
            p = specialPeerMap.get(target);
        }
        if (p != null) return p;
        else
            return SunToolkit.targetToPeer(target);
    }

    // Need this for XMenuItemPeer.
    protected static void targetDisposedPeer(Object target, Object peer) {
        SunToolkit.targetDisposedPeer(target, peer);
    }

    @Override
    public RobotPeer createRobot(Robot target, GraphicsDevice screen) {
        return new XRobotPeer(screen.getDefaultConfiguration());
    }


  /*
     * On X, support for dynamic layout on resizing is governed by the
     * window manager.  If the window manager supports it, it happens
     * automatically.  The setter method for this property is
     * irrelevant on X.
     */
    @Override
    public void setDynamicLayout(boolean b) {
        dynamicLayoutSetting = b;
    }

    @Override
    protected boolean isDynamicLayoutSet() {
        return dynamicLayoutSetting;
    }

    /* Called from isDynamicLayoutActive() and from
     * lazilyLoadDynamicLayoutSupportedProperty()
     */
    protected boolean isDynamicLayoutSupported() {
        return XWM.getWM().supportsDynamicLayout();
    }

    @Override
    public boolean isDynamicLayoutActive() {
        return isDynamicLayoutSupported();
    }

    @Override
    public FontPeer getFontPeer(String name, int style){
        return new XFontPeer(name, style);
    }

    @Override
    public DragSourceContextPeer createDragSourceContextPeer(DragGestureEvent dge) throws InvalidDnDOperationException {
        final LightweightFrame f = SunToolkit.getLightweightFrame(dge.getComponent());
        if (f != null) {
            return f.createDragSourceContextPeer(dge);
        }

        return XDragSourceContextPeer.createDragSourceContextPeer(dge);
    }

    @Override
    @SuppressWarnings("unchecked")
    public <T extends DragGestureRecognizer> T
    createDragGestureRecognizer(Class<T> recognizerClass,
                    DragSource ds,
                    Component c,
                    int srcActions,
                    DragGestureListener dgl)
    {
        final LightweightFrame f = SunToolkit.getLightweightFrame(c);
        if (f != null) {
            return f.createDragGestureRecognizer(recognizerClass, ds, c, srcActions, dgl);
        }

        if (MouseDragGestureRecognizer.class.equals(recognizerClass))
            return (T)new XMouseDragGestureRecognizer(ds, c, srcActions, dgl);
        else
            return null;
    }

    @Override
    public CheckboxMenuItemPeer createCheckboxMenuItem(CheckboxMenuItem target) {
        XCheckboxMenuItemPeer peer = new XCheckboxMenuItemPeer(target);
        //vb157120: looks like we don't need to map menu items
        //in new menus implementation
        //targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public MenuItemPeer createMenuItem(MenuItem target) {
        XMenuItemPeer peer = new XMenuItemPeer(target);
        //vb157120: looks like we don't need to map menu items
        //in new menus implementation
        //targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public TextFieldPeer createTextField(TextField target) {
        TextFieldPeer  peer = new XTextFieldPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public LabelPeer createLabel(Label target) {
        LabelPeer  peer = new XLabelPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public ListPeer createList(java.awt.List target) {
        ListPeer peer = new XListPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public CheckboxPeer createCheckbox(Checkbox target) {
        CheckboxPeer peer = new XCheckboxPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public ScrollbarPeer createScrollbar(Scrollbar target) {
        XScrollbarPeer peer = new XScrollbarPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public ScrollPanePeer createScrollPane(ScrollPane target) {
        XScrollPanePeer peer = new XScrollPanePeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public TextAreaPeer createTextArea(TextArea target) {
        TextAreaPeer peer = new XTextAreaPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public ChoicePeer createChoice(Choice target) {
        XChoicePeer peer = new XChoicePeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public CanvasPeer createCanvas(Canvas target) {
        XCanvasPeer peer = (isXEmbedServerRequested() ? new XEmbedCanvasPeer(target) : new XCanvasPeer(target));
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public PanelPeer createPanel(Panel target) {
        PanelPeer peer = new XPanelPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public WindowPeer createWindow(Window target) {
        WindowPeer peer = new XWindowPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public DialogPeer createDialog(Dialog target) {
        DialogPeer peer = new XDialogPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    private static Boolean sunAwtDisableGtkFileDialogs = null;

    
Returns the value of "sun.awt.disableGtkFileDialogs" property. Default value is false. /**
     * Returns the value of "sun.awt.disableGtkFileDialogs" property. Default
     * value is {@code false}.
     */
    public static synchronized boolean getSunAwtDisableGtkFileDialogs() {
        if (sunAwtDisableGtkFileDialogs == null) {
            sunAwtDisableGtkFileDialogs = AccessController.doPrivileged(
                                              new GetBooleanAction("sun.awt.disableGtkFileDialogs"));
        }
        return sunAwtDisableGtkFileDialogs.booleanValue();
    }

    @Override
    public FileDialogPeer createFileDialog(FileDialog target) {
        FileDialogPeer peer = null;
        // The current GtkFileChooser is available from GTK+ 2.4
        if (!getSunAwtDisableGtkFileDialogs() &&
                      (checkGtkVersion(2, 4, 0) || checkGtkVersion(3, 0, 0))) {
            peer = new GtkFileDialogPeer(target);
        } else {
            peer = new XFileDialogPeer(target);
        }
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public MenuBarPeer createMenuBar(MenuBar target) {
        XMenuBarPeer peer = new XMenuBarPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public MenuPeer createMenu(Menu target) {
        XMenuPeer peer = new XMenuPeer(target);
        //vb157120: looks like we don't need to map menu items
        //in new menus implementation
        //targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public PopupMenuPeer createPopupMenu(PopupMenu target) {
        XPopupMenuPeer peer = new XPopupMenuPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public synchronized MouseInfoPeer getMouseInfoPeer() {
        if (xPeer == null) {
            xPeer = new XMouseInfoPeer();
        }
        return xPeer;
    }

    public XEmbeddedFramePeer createEmbeddedFrame(XEmbeddedFrame target)
    {
        XEmbeddedFramePeer peer = new XEmbeddedFramePeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    XEmbedChildProxyPeer createEmbedProxy(XEmbedChildProxy target) {
        XEmbedChildProxyPeer peer = new XEmbedChildProxyPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public KeyboardFocusManagerPeer getKeyboardFocusManagerPeer() throws HeadlessException {
        return XKeyboardFocusManagerPeer.getInstance();
    }

    
Returns a new custom cursor.
/**
     * Returns a new custom cursor.
     */
    @Override
    public Cursor createCustomCursor(Image cursor, Point hotSpot, String name)
      throws IndexOutOfBoundsException {
        return new XCustomCursor(cursor, hotSpot, name);
    }

    @Override
    public TrayIconPeer createTrayIcon(TrayIcon target)
      throws HeadlessException, AWTException
    {
        TrayIconPeer peer = new XTrayIconPeer(target);
        targetCreatedPeer(target, peer);
        return peer;
    }

    @Override
    public SystemTrayPeer createSystemTray(SystemTray target) throws HeadlessException {
        SystemTrayPeer peer = new XSystemTrayPeer(target);
        return peer;
    }

    @Override
    public boolean isTraySupported() {
        XSystemTrayPeer peer = XSystemTrayPeer.getPeerInstance();
        if (peer != null) {
            return peer.isAvailable();
        }
        return false;
    }

    @Override
    public DataTransferer getDataTransferer() {
        return XDataTransferer.getInstanceImpl();
    }

    
Returns the supported cursor size
/**
     * Returns the supported cursor size
     */
    @Override
    public Dimension getBestCursorSize(int preferredWidth, int preferredHeight) {
        return XCustomCursor.getBestCursorSize(
                                               java.lang.Math.max(1,preferredWidth), java.lang.Math.max(1,preferredHeight));
    }


    @Override
    public int getMaximumCursorColors() {
        return 2;  // Black and white.
    }

    @Override
    public Map<TextAttribute, ?> mapInputMethodHighlight( InputMethodHighlight highlight) {
        return XInputMethod.mapInputMethodHighlight(highlight);
    }
    @Override
    public boolean getLockingKeyState(int key) {
        if (! (key == KeyEvent.VK_CAPS_LOCK || key == KeyEvent.VK_NUM_LOCK ||
               key == KeyEvent.VK_SCROLL_LOCK || key == KeyEvent.VK_KANA_LOCK)) {
            throw new IllegalArgumentException("invalid key for Toolkit.getLockingKeyState");
        }
        awtLock();
        try {
            return getModifierState( key );
        } finally {
            awtUnlock();
        }
    }

    @Override
    public  Clipboard getSystemClipboard() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkPermission(AWTPermissions.ACCESS_CLIPBOARD_PERMISSION);
        }
        synchronized (this) {
            if (clipboard == null) {
                clipboard = new XClipboard("System", "CLIPBOARD");
            }
        }
        return clipboard;
    }

    @Override
    public Clipboard getSystemSelection() {
        SecurityManager security = System.getSecurityManager();
        if (security != null) {
            security.checkPermission(AWTPermissions.ACCESS_CLIPBOARD_PERMISSION);
        }
        synchronized (this) {
            if (selection == null) {
                selection = new XClipboard("Selection", "PRIMARY");
            }
        }
        return selection;
    }

    @Override
    public void beep() {
        awtLock();
        try {
            XlibWrapper.XBell(getDisplay(), 0);
            XlibWrapper.XFlush(getDisplay());
        } finally {
            awtUnlock();
        }
    }

    @Override
    public PrintJob getPrintJob(final Frame frame, final String doctitle,
                                final Properties props) {

        if (frame == null) {
            throw new NullPointerException("frame must not be null");
        }

        PrintJob2D printJob = new PrintJob2D(frame, doctitle, props);

        if (printJob.printDialog() == false) {
            printJob = null;
        }
        return printJob;
    }

    @Override
    public PrintJob getPrintJob(final Frame frame, final String doctitle,
                final JobAttributes jobAttributes,
                final PageAttributes pageAttributes)
    {
        if (frame == null) {
            throw new NullPointerException("frame must not be null");
        }

        PrintJob2D printJob = new PrintJob2D(frame, doctitle,
                                             jobAttributes, pageAttributes);

        if (printJob.printDialog() == false) {
            printJob = null;
        }

        return printJob;
    }

    static void XSync() {
        awtLock();
        try {
            XlibWrapper.XSync(getDisplay(),0);
        } finally {
            awtUnlock();
        }
    }

    @Override
    public int getScreenResolution() {
        long display = getDisplay();
        awtLock();
        try {
            return (int) ((XlibWrapper.DisplayWidth(display,
                XlibWrapper.DefaultScreen(display)) * 25.4) /
                    XlibWrapper.DisplayWidthMM(display,
                XlibWrapper.DefaultScreen(display)));
        } finally {
            awtUnlock();
        }
    }

    static native long getDefaultXColormap();
    static native long getDefaultScreenData();

    
Returns a new input method adapter descriptor for native input methods.
/**
     * Returns a new input method adapter descriptor for native input methods.
     */
    @Override
    public InputMethodDescriptor getInputMethodAdapterDescriptor() throws AWTException {
        return new XInputMethodDescriptor();
    }

    
Returns whether enableInputMethods should be set to true for peered
TextComponent instances on this platform. True by default.
/**
     * Returns whether enableInputMethods should be set to true for peered
     * TextComponent instances on this platform. True by default.
     */
    @Override
    public boolean enableInputMethodsForTextComponent() {
        return true;
    }

    static int getMultiClickTime() {
        if (awt_multiclick_time == 0) {
            initializeMultiClickTime();
        }
        return awt_multiclick_time;
    }
    static void initializeMultiClickTime() {
        awtLock();
        try {
            try {
                String multiclick_time_query = XlibWrapper.XGetDefault(XToolkit.getDisplay(), "*", "multiClickTime");
                if (multiclick_time_query != null) {
                    awt_multiclick_time = (int)Long.parseLong(multiclick_time_query);
                } else {
                    multiclick_time_query = XlibWrapper.XGetDefault(XToolkit.getDisplay(),
                                                                    "OpenWindows", "MultiClickTimeout");
                    if (multiclick_time_query != null) {
                        /* Note: OpenWindows.MultiClickTimeout is in tenths of
                           a second, so we need to multiply by 100 to convert to
                           milliseconds */
                        awt_multiclick_time = (int)Long.parseLong(multiclick_time_query) * 100;
                    } else {
                        awt_multiclick_time = AWT_MULTICLICK_DEFAULT_TIME;
                    }
                }
            } catch (NumberFormatException nf) {
                awt_multiclick_time = AWT_MULTICLICK_DEFAULT_TIME;
            } catch (NullPointerException npe) {
                awt_multiclick_time = AWT_MULTICLICK_DEFAULT_TIME;
            }
        } finally {
            awtUnlock();
        }
        if (awt_multiclick_time == 0) {
            awt_multiclick_time = AWT_MULTICLICK_DEFAULT_TIME;
        }
    }

    @Override
    public boolean isFrameStateSupported(int state)
      throws HeadlessException
    {
        if (state == Frame.NORMAL || state == Frame.ICONIFIED) {
            return true;
        } else {
            return XWM.getWM().supportsExtendedState(state);
        }
    }

    static void dumpPeers() {
        if (log.isLoggable(PlatformLogger.Level.FINE)) {
            log.fine("Mapped windows:");
            winMap.forEach((k, v) -> {
                log.fine(k + "->" + v);
                if (v instanceof XComponentPeer) {
                    Component target = (Component)((XComponentPeer)v).getTarget();
                    log.fine("\ttarget: " + target);
                }
            });

            SunToolkit.dumpPeers(log);

            log.fine("Mapped special peers:");
            specialPeerMap.forEach((k, v) -> {
                log.fine(k + "->" + v);
            });

            log.fine("Mapped dispatchers:");
            winToDispatcher.forEach((k, v) -> {
                log.fine(k + "->" + v);
            });
        }
    }

    /* Protected with awt_lock. */
    private static boolean initialized;
    private static boolean timeStampUpdated;
    private static long timeStamp;

    private static final XEventDispatcher timeFetcher =
    new XEventDispatcher() {
            @Override
            public void dispatchEvent(XEvent ev) {
                switch (ev.get_type()) {
                  case XConstants.PropertyNotify:
                      XPropertyEvent xpe = ev.get_xproperty();

                      awtLock();
                      try {
                          timeStamp = xpe.get_time();
                          timeStampUpdated = true;
                          awtLockNotifyAll();
                      } finally {
                          awtUnlock();
                      }

                      break;
                }
            }
        };

    private static XAtom _XA_JAVA_TIME_PROPERTY_ATOM;

    static long getCurrentServerTime() {
        awtLock();
        try {
            try {
                if (!initialized) {
                    XToolkit.addEventDispatcher(XBaseWindow.getXAWTRootWindow().getWindow(),
                                                timeFetcher);
                    _XA_JAVA_TIME_PROPERTY_ATOM = XAtom.get("_SUNW_JAVA_AWT_TIME");
                    initialized = true;
                }
                timeStampUpdated = false;
                XlibWrapper.XChangeProperty(XToolkit.getDisplay(),
                                            XBaseWindow.getXAWTRootWindow().getWindow(),
                                            _XA_JAVA_TIME_PROPERTY_ATOM.getAtom(), XAtom.XA_ATOM, 32,
                                            XConstants.PropModeAppend,
                                            0, 0);
                XlibWrapper.XFlush(XToolkit.getDisplay());

                if (isToolkitThread()) {
                    XEvent event = new XEvent();
                    try {
                        XlibWrapper.XWindowEvent(XToolkit.getDisplay(),
                                                 XBaseWindow.getXAWTRootWindow().getWindow(),
                                                 XConstants.PropertyChangeMask,
                                                 event.pData);
                        timeFetcher.dispatchEvent(event);
                    }
                    finally {
                        event.dispose();
                    }
                }
                else {
                    while (!timeStampUpdated) {
                        awtLockWait();
                    }
                }
            } catch (InterruptedException ie) {
            // Note: the returned timeStamp can be incorrect in this case.
                if (log.isLoggable(PlatformLogger.Level.FINE)) {
                    log.fine("Catched exception, timeStamp may not be correct (ie = " + ie + ")");
                }
            }
        } finally {
            awtUnlock();
        }
        return timeStamp;
    }
    @Override
    protected void initializeDesktopProperties() {
        desktopProperties.put("DnD.Autoscroll.initialDelay",
                              Integer.valueOf(50));
        desktopProperties.put("DnD.Autoscroll.interval",
                              Integer.valueOf(50));
        desktopProperties.put("DnD.Autoscroll.cursorHysteresis",
                              Integer.valueOf(5));
        desktopProperties.put("Shell.shellFolderManager",
                              "sun.awt.shell.ShellFolderManager");
        // Don't want to call getMultiClickTime() if we are headless
        if (!GraphicsEnvironment.isHeadless()) {
            desktopProperties.put("awt.multiClickInterval",
                                  Integer.valueOf(getMultiClickTime()));
            desktopProperties.put("awt.mouse.numButtons",
                                  Integer.valueOf(getNumberOfButtons()));
            if(SunGraphicsEnvironment.isUIScaleEnabled()) {
                addPropertyChangeListener("gnome.Xft/DPI", evt ->
                                                     localEnv.displayChanged());
            }
        }
    }

    
This method runs through the XPointer and XExtendedPointer array.
XExtendedPointer has priority because on some systems XPointer
(which is assigned to the virtual pointer) reports the maximum
capabilities of the mouse pointer (i.e. 32 physical buttons).
/**
     * This method runs through the XPointer and XExtendedPointer array.
     * XExtendedPointer has priority because on some systems XPointer
     * (which is assigned to the virtual pointer) reports the maximum
     * capabilities of the mouse pointer (i.e. 32 physical buttons).
     */
    private native int getNumberOfButtonsImpl();

    @Override
    public int getNumberOfButtons(){
        awtLock();
        try {
            if (numberOfButtons == 0) {
                numberOfButtons = getNumberOfButtonsImpl();
                numberOfButtons = (numberOfButtons > MAX_BUTTONS_SUPPORTED)? MAX_BUTTONS_SUPPORTED : numberOfButtons;
                //4th and 5th buttons are for wheel and shouldn't be reported as buttons.
                //If we have more than 3 physical buttons and a wheel, we report N-2 buttons.
                //If we have 3 physical buttons and a wheel, we report 3 buttons.
                //If we have 1,2,3 physical buttons, we report it as is i.e. 1,2 or 3 respectively.
                if (numberOfButtons >=5) {
                    numberOfButtons -= 2;
                } else if (numberOfButtons == 4 || numberOfButtons ==5){
                    numberOfButtons = 3;
                }
            }
            //Assume don't have to re-query the number again and again.
            return numberOfButtons;
        } finally {
            awtUnlock();
        }
    }

    static int getNumberOfButtonsForMask() {
        return Math.min(XConstants.MAX_BUTTONS, ((SunToolkit) (Toolkit.getDefaultToolkit())).getNumberOfButtons());
    }

    private static final String prefix  = "DnD.Cursor.";
    private static final String postfix = ".32x32";
    private static final String dndPrefix  = "DnD.";

    @Override
    protected Object lazilyLoadDesktopProperty(String name) {
        if (name.startsWith(prefix)) {
            String cursorName = name.substring(prefix.length(), name.length()) + postfix;

            try {
                return Cursor.getSystemCustomCursor(cursorName);
            } catch (AWTException awte) {
                throw new RuntimeException("cannot load system cursor: " + cursorName, awte);
            }
        }

        if (name.equals("awt.dynamicLayoutSupported")) {
            return  Boolean.valueOf(isDynamicLayoutSupported());
        }

        if (initXSettingsIfNeeded(name)) {
            return desktopProperties.get(name);
        }

        return super.lazilyLoadDesktopProperty(name);
    }

    @Override
    public synchronized void addPropertyChangeListener(String name, PropertyChangeListener pcl) {
        if (name == null) {
            // See JavaDoc for the Toolkit.addPropertyChangeListener() method
            return;
        }
        initXSettingsIfNeeded(name);
        super.addPropertyChangeListener(name, pcl);
    }

    
Initializes XAWTXSettings if a property for a given property name is provided by
XSettings and they are not initialized yet.
Returns:
true if the method has initialized XAWTXSettings./**
     * Initializes XAWTXSettings if a property for a given property name is provided by
     * XSettings and they are not initialized yet.
     *
     * @return true if the method has initialized XAWTXSettings.
     */
    private boolean initXSettingsIfNeeded(final String propName) {
        if (!loadedXSettings &&
            (propName.startsWith("gnome.") ||
             propName.equals(SunToolkit.DESKTOPFONTHINTS) ||
             propName.startsWith(dndPrefix)))
        {
            loadedXSettings = true;
            if (!GraphicsEnvironment.isHeadless()) {
                loadXSettings();
                /* If no desktop font hint could be retrieved, check for
                 * KDE running KWin and retrieve settings from fontconfig.
                 * If that isn't found let SunToolkit will see if there's a
                 * system property set by a user.
                 */
                if (desktopProperties.get(SunToolkit.DESKTOPFONTHINTS) == null) {
                    if (XWM.isKDE2()) {
                        Object hint = FontConfigManager.getFontConfigAAHint();
                        if (hint != null) {
                            /* set the fontconfig/KDE property so that
                             * getDesktopHints() below will see it
                             * and set the public property.
                             */
                            desktopProperties.put(UNIXToolkit.FONTCONFIGAAHINT,
                                                  hint);
                        }
                    }
                    desktopProperties.put(SunToolkit.DESKTOPFONTHINTS,
                                          SunToolkit.getDesktopFontHints());
                }

                return true;
            }
        }
        return false;
    }

    private void loadXSettings() {
       xs = new XAWTXSettings();
    }

    
Callback from the native side indicating some, or all, of the desktop properties have changed and need to be reloaded. data is the byte array directly from the x server and may be in little endian format. 
 NB: This could be called from any thread if triggered by loadXSettings. It is called from the System EDT if triggered by an XSETTINGS change. /**
     * Callback from the native side indicating some, or all, of the
     * desktop properties have changed and need to be reloaded.
     * {@code data} is the byte array directly from the x server and
     * may be in little endian format.
     * <p>
     * NB: This could be called from any thread if triggered by
     * {@code loadXSettings}.  It is called from the System EDT
     * if triggered by an XSETTINGS change.
     */
    void parseXSettings(int screen_XXX_ignored,Map<String, Object> updatedSettings) {

        if (updatedSettings == null || updatedSettings.isEmpty()) {
            return;
        }

        Iterator<Map.Entry<String, Object>> i = updatedSettings.entrySet().iterator();
        while (i.hasNext()) {
            Map.Entry<String, Object> e = i.next();
            String name = e.getKey();

            name = "gnome." + name;
            setDesktopProperty(name, e.getValue());
            if (log.isLoggable(PlatformLogger.Level.FINE)) {
                log.fine("name = " + name + " value = " + e.getValue());
            }

            // XXX: we probably want to do something smarter.  In
            // particular, "Net" properties are of interest to the
            // "core" AWT itself.  E.g.
            //
            // Net/DndDragThreshold -> ???
            // Net/DoubleClickTime  -> awt.multiClickInterval
        }

        setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
                           SunToolkit.getDesktopFontHints());

        Integer dragThreshold = null;
        synchronized (this) {
            dragThreshold = (Integer)desktopProperties.get("gnome.Net/DndDragThreshold");
        }
        if (dragThreshold != null) {
            setDesktopProperty("DnD.gestureMotionThreshold", dragThreshold);
        }

    }



    static int altMask;
    static int metaMask;
    static int numLockMask;
    static int modeSwitchMask;
    static int modLockIsShiftLock;

    /* Like XKeysymToKeycode, but ensures that keysym is the primary
    * symbol on the keycode returned.  Returns zero otherwise.
    */
    static int keysymToPrimaryKeycode(long sym) {
        awtLock();
        try {
            int code = XlibWrapper.XKeysymToKeycode(getDisplay(), sym);
            if (code == 0) {
                return 0;
            }
            long primary = XlibWrapper.XKeycodeToKeysym(getDisplay(), code, 0);
            if (sym != primary) {
                return 0;
            }
            return code;
        } finally {
            awtUnlock();
        }
    }
    static boolean getModifierState( int jkc ) {
        int iKeyMask = 0;
        long ks = XKeysym.javaKeycode2Keysym( jkc );
        int  kc = XlibWrapper.XKeysymToKeycode(getDisplay(), ks);
        if (kc == 0) {
            return false;
        }
        awtLock();
        try {
            XModifierKeymap modmap = new XModifierKeymap(
                 XlibWrapper.XGetModifierMapping(getDisplay()));

            int nkeys = modmap.get_max_keypermod();

            long map_ptr = modmap.get_modifiermap();
            for( int k = 0; k < 8; k++ ) {
                for (int i = 0; i < nkeys; ++i) {
                    int keycode = Native.getUByte(map_ptr, k * nkeys + i);
                    if (keycode == 0) {
                        continue; // ignore zero keycode
                    }
                    if (kc == keycode) {
                        iKeyMask = 1 << k;
                        break;
                    }
                }
                if( iKeyMask != 0 ) {
                    break;
                }
            }
            XlibWrapper.XFreeModifiermap(modmap.pData);
            if (iKeyMask == 0 ) {
                return false;
            }
            // Now we know to which modifier is assigned the keycode
            // correspondent to the keysym correspondent to the java
            // keycode. We are going to check a state of this modifier.
            // If a modifier is a weird one, we cannot help it.
            long window = 0;
            try{
                // get any application window
                window = winMap.firstKey().longValue();
            }catch(NoSuchElementException nex) {
                // get root window
                window = getDefaultRootWindow();
            }
            boolean res = XlibWrapper.XQueryPointer(getDisplay(), window,
                                            XlibWrapper.larg1, //root
                                            XlibWrapper.larg2, //child
                                            XlibWrapper.larg3, //root_x
                                            XlibWrapper.larg4, //root_y
                                            XlibWrapper.larg5, //child_x
                                            XlibWrapper.larg6, //child_y
                                            XlibWrapper.larg7);//mask
            int mask = Native.getInt(XlibWrapper.larg7);
            return ((mask & iKeyMask) != 0);
        } finally {
            awtUnlock();
        }
    }

    /* Assign meaning - alt, meta, etc. - to X modifiers mod1 ... mod5.
     * Only consider primary symbols on keycodes attached to modifiers.
     */
    static void setupModifierMap() {
        final int metaL = keysymToPrimaryKeycode(XKeySymConstants.XK_Meta_L);
        final int metaR = keysymToPrimaryKeycode(XKeySymConstants.XK_Meta_R);
        final int altL = keysymToPrimaryKeycode(XKeySymConstants.XK_Alt_L);
        final int altR = keysymToPrimaryKeycode(XKeySymConstants.XK_Alt_R);
        final int numLock = keysymToPrimaryKeycode(XKeySymConstants.XK_Num_Lock);
        final int modeSwitch = keysymToPrimaryKeycode(XKeySymConstants.XK_Mode_switch);
        final int shiftLock = keysymToPrimaryKeycode(XKeySymConstants.XK_Shift_Lock);
        final int capsLock  = keysymToPrimaryKeycode(XKeySymConstants.XK_Caps_Lock);

        final int[] modmask = { XConstants.ShiftMask, XConstants.LockMask, XConstants.ControlMask, XConstants.Mod1Mask,
            XConstants.Mod2Mask, XConstants.Mod3Mask, XConstants.Mod4Mask, XConstants.Mod5Mask };

        log.fine("In setupModifierMap");
        awtLock();
        try {
            XModifierKeymap modmap = new XModifierKeymap(
                 XlibWrapper.XGetModifierMapping(getDisplay()));

            int nkeys = modmap.get_max_keypermod();

            long map_ptr = modmap.get_modifiermap();

            for (int modn = XConstants.Mod1MapIndex;
                 modn <= XConstants.Mod5MapIndex;
                 ++modn)
            {
                for (int i = 0; i < nkeys; ++i) {
                    /* for each keycode attached to this modifier */
                    int keycode = Native.getUByte(map_ptr, modn * nkeys + i);

                    if (keycode == 0) {
                        break;
                    }
                    if (metaMask == 0 &&
                        (keycode == metaL || keycode == metaR))
                    {
                        metaMask = modmask[modn];
                        break;
                    }
                    if (altMask == 0 && (keycode == altL || keycode == altR)) {
                        altMask = modmask[modn];
                        break;
                    }
                    if (numLockMask == 0 && keycode == numLock) {
                        numLockMask = modmask[modn];
                        break;
                    }
                    if (modeSwitchMask == 0 && keycode == modeSwitch) {
                        modeSwitchMask = modmask[modn];
                        break;
                    }
                    continue;
                }
            }
            modLockIsShiftLock = 0;
            for (int j = 0; j < nkeys; ++j) {
                int keycode = Native.getUByte(map_ptr, XConstants.LockMapIndex * nkeys + j);
                if (keycode == 0) {
                    break;
                }
                if (keycode == shiftLock) {
                    modLockIsShiftLock = 1;
                    break;
                }
                if (keycode == capsLock) {
                    break;
                }
            }
            XlibWrapper.XFreeModifiermap(modmap.pData);
        } finally {
            awtUnlock();
        }
        if (log.isLoggable(PlatformLogger.Level.FINE)) {
            log.fine("metaMask = " + metaMask);
            log.fine("altMask = " + altMask);
            log.fine("numLockMask = " + numLockMask);
            log.fine("modeSwitchMask = " + modeSwitchMask);
            log.fine("modLockIsShiftLock = " + modLockIsShiftLock);
        }
    }


    private static SortedMap<Long, java.util.List<Runnable>> timeoutTasks;

    
Removed the task from the list of waiting-to-be called tasks.
If the task has been scheduled several times removes only first one.
/**
     * Removed the task from the list of waiting-to-be called tasks.
     * If the task has been scheduled several times removes only first one.
     */
    static void remove(Runnable task) {
        if (task == null) {
            throw new NullPointerException("task is null");
        }
        awtLock();
        try {
            if (timeoutTaskLog.isLoggable(PlatformLogger.Level.FINER)) {
                timeoutTaskLog.finer("Removing task " + task);
            }
            if (timeoutTasks == null) {
                if (timeoutTaskLog.isLoggable(PlatformLogger.Level.FINER)) {
                    timeoutTaskLog.finer("Task is not scheduled");
                }
                return;
            }
            Collection<java.util.List<Runnable>> values = timeoutTasks.values();
            Iterator<java.util.List<Runnable>> iter = values.iterator();
            while (iter.hasNext()) {
                java.util.List<Runnable> list = iter.next();
                boolean removed = false;
                if (list.contains(task)) {
                    list.remove(task);
                    if (list.isEmpty()) {
                        iter.remove();
                    }
                    break;
                }
            }
        } finally {
            awtUnlock();
        }
    }

    static native void wakeup_poll();

    
Registers a Runnable which run() method will be called once on the toolkit thread when a specified interval of time elapses. 
Params:
task – a Runnable which run method will be called on the toolkit thread when interval milliseconds elapse
interval – an interal in milliseconds
Throws:
NullPointerException – if task is null
IllegalArgumentException – if interval is not positive/**
     * Registers a Runnable which {@code run()} method will be called
     * once on the toolkit thread when a specified interval of time elapses.
     *
     * @param task a Runnable which {@code run} method will be called
     *        on the toolkit thread when {@code interval} milliseconds
     *        elapse
     * @param interval an interal in milliseconds
     *
     * @throws NullPointerException if {@code task} is {@code null}
     * @throws IllegalArgumentException if {@code interval} is not positive
     */
    static void schedule(Runnable task, long interval) {
        if (task == null) {
            throw new NullPointerException("task is null");
        }
        if (interval <= 0) {
            throw new IllegalArgumentException("interval " + interval + " is not positive");
        }

        awtLock();
        try {
            if (timeoutTaskLog.isLoggable(PlatformLogger.Level.FINER)) {
                timeoutTaskLog.finer("XToolkit.schedule(): current time={0}" +
                                     ";  interval={1}" +
                                     ";  task being added={2}" + ";  tasks before addition={3}",
                                     Long.valueOf(System.currentTimeMillis()), Long.valueOf(interval), task, timeoutTasks);
            }

            if (timeoutTasks == null) {
                timeoutTasks = new TreeMap<>();
            }

            Long time = Long.valueOf(System.currentTimeMillis() + interval);
            java.util.List<Runnable> tasks = timeoutTasks.get(time);
            if (tasks == null) {
                tasks = new ArrayList<>(1);
                timeoutTasks.put(time, tasks);
            }
            tasks.add(task);


            if (timeoutTasks.get(timeoutTasks.firstKey()) == tasks && tasks.size() == 1) {
                // Added task became first task - poll won't know
                // about it so we need to wake it up
                wakeup_poll();
            }
        }  finally {
            awtUnlock();
        }
    }

    private long getNextTaskTime() {
        awtLock();
        try {
            if (timeoutTasks == null || timeoutTasks.isEmpty()) {
                return -1L;
            }
            return timeoutTasks.firstKey();
        } finally {
            awtUnlock();
        }
    }

    
Executes mature timeout tasks registered with schedule().
Called from run() under awtLock.
/**
     * Executes mature timeout tasks registered with schedule().
     * Called from run() under awtLock.
     */
    private static void callTimeoutTasks() {
        if (timeoutTaskLog.isLoggable(PlatformLogger.Level.FINER)) {
            timeoutTaskLog.finer("XToolkit.callTimeoutTasks(): current time={0}" +
                                 ";  tasks={1}", Long.valueOf(System.currentTimeMillis()), timeoutTasks);
        }

        if (timeoutTasks == null || timeoutTasks.isEmpty()) {
            return;
        }

        Long currentTime = Long.valueOf(System.currentTimeMillis());
        Long time = timeoutTasks.firstKey();

        while (time.compareTo(currentTime) <= 0) {
            java.util.List<Runnable> tasks = timeoutTasks.remove(time);

            for (Iterator<Runnable> iter = tasks.iterator(); iter.hasNext();) {
                Runnable task = iter.next();

                if (timeoutTaskLog.isLoggable(PlatformLogger.Level.FINER)) {
                    timeoutTaskLog.finer("XToolkit.callTimeoutTasks(): current time={0}" +
                                         ";  about to run task={1}", Long.valueOf(currentTime), task);
                }

                try {
                    task.run();
                } catch (ThreadDeath td) {
                    throw td;
                } catch (Throwable thr) {
                    processException(thr);
                }
            }

            if (timeoutTasks.isEmpty()) {
                break;
            }
            time = timeoutTasks.firstKey();
        }
    }

    static long getAwtDefaultFg() {
        return awt_defaultFg;
    }

    static boolean isLeftMouseButton(MouseEvent me) {
        switch (me.getID()) {
          case MouseEvent.MOUSE_PRESSED:
          case MouseEvent.MOUSE_RELEASED:
              return (me.getButton() == MouseEvent.BUTTON1);
          case MouseEvent.MOUSE_ENTERED:
          case MouseEvent.MOUSE_EXITED:
          case MouseEvent.MOUSE_CLICKED:
          case MouseEvent.MOUSE_DRAGGED:
              return ((me.getModifiersEx() & InputEvent.BUTTON1_DOWN_MASK) != 0);
        }
        return false;
    }

    static boolean isRightMouseButton(MouseEvent me) {
        int numButtons = ((Integer)getDefaultToolkit().getDesktopProperty("awt.mouse.numButtons")).intValue();
        switch (me.getID()) {
          case MouseEvent.MOUSE_PRESSED:
          case MouseEvent.MOUSE_RELEASED:
              return ((numButtons == 2 && me.getButton() == MouseEvent.BUTTON2) ||
                       (numButtons > 2 && me.getButton() == MouseEvent.BUTTON3));
          case MouseEvent.MOUSE_ENTERED:
          case MouseEvent.MOUSE_EXITED:
          case MouseEvent.MOUSE_CLICKED:
          case MouseEvent.MOUSE_DRAGGED:
              return ((numButtons == 2 && (me.getModifiersEx() & InputEvent.BUTTON2_DOWN_MASK) != 0) ||
                      (numButtons > 2 && (me.getModifiersEx() & InputEvent.BUTTON3_DOWN_MASK) != 0));
        }
        return false;
    }

    static long reset_time_utc;
    static final long WRAP_TIME_MILLIS = 0x00000000FFFFFFFFL;

    /*
     * This function converts between the X server time (number of milliseconds
     * since the last server reset) and the UTC time for the 'when' field of an
     * InputEvent (or another event type with a timestamp).
     */
    static long nowMillisUTC_offset(long server_offset) {
        // ported from awt_util.c
        /*
         * Because Time is of type 'unsigned long', it is possible that Time will
         * never wrap when using 64-bit Xlib. However, if a 64-bit client
         * connects to a 32-bit server, I suspect the values will still wrap. So
         * we should not attempt to remove the wrap checking even if _LP64 is
         * true.
         */

        long current_time_utc = System.currentTimeMillis();
        if (log.isLoggable(PlatformLogger.Level.FINER)) {
            log.finer("reset_time=" + reset_time_utc + ", current_time=" + current_time_utc
                      + ", server_offset=" + server_offset + ", wrap_time=" + WRAP_TIME_MILLIS);
        }

        if ((current_time_utc - reset_time_utc) > WRAP_TIME_MILLIS) {
            reset_time_utc = System.currentTimeMillis() - getCurrentServerTime();
        }

        if (log.isLoggable(PlatformLogger.Level.FINER)) {
            log.finer("result = " + (reset_time_utc + server_offset));
        }
        return reset_time_utc + server_offset;
    }

    
See Also:
needsXEmbedImpl.needsXEmbedImpl/**
     * @see sun.awt.SunToolkit#needsXEmbedImpl
     */
    @Override
    protected boolean needsXEmbedImpl() {
        // XToolkit implements supports for XEmbed-client protocol and
        // requires the supports from the embedding host for it to work.
        return true;
    }

    @Override
    public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
        return (modalityType == null) ||
               (modalityType == Dialog.ModalityType.MODELESS) ||
               (modalityType == Dialog.ModalityType.DOCUMENT_MODAL) ||
               (modalityType == Dialog.ModalityType.APPLICATION_MODAL) ||
               (modalityType == Dialog.ModalityType.TOOLKIT_MODAL);
    }

    @Override
    public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
        return (exclusionType == null) ||
               (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE) ||
               (exclusionType == Dialog.ModalExclusionType.APPLICATION_EXCLUDE) ||
               (exclusionType == Dialog.ModalExclusionType.TOOLKIT_EXCLUDE);
    }

    static EventQueue getEventQueue(Object target) {
        AppContext appContext = targetToAppContext(target);
        if (appContext != null) {
            return (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
        }
        return null;
    }

    static void removeSourceEvents(EventQueue queue,
                                   Object source,
                                   boolean removeAllEvents) {
        AWTAccessor.getEventQueueAccessor()
            .removeSourceEvents(queue, source, removeAllEvents);
    }

    @Override
    public boolean isAlwaysOnTopSupported() {
        for (XLayerProtocol proto : XWM.getWM().getProtocols(XLayerProtocol.class)) {
            if (proto.supportsLayer(XLayerProtocol.LAYER_ALWAYS_ON_TOP)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public boolean useBufferPerWindow() {
        return XToolkit.getBackingStoreType() == XConstants.NotUseful;
    }

    
Returns one of XConstants: NotUseful, WhenMapped or Always.
If backing store is not available on at least one screen, or
the string system property "sun.awt.backingStore" is neither "Always"
nor "WhenMapped", then the method returns XConstants.NotUseful.
Otherwise, if the system property "sun.awt.backingStore" is "WhenMapped",
then the method returns XConstants.WhenMapped.
Otherwise (i.e., if the system property "sun.awt.backingStore" is "Always"),
the method returns XConstants.Always.
/**
     * Returns one of XConstants: NotUseful, WhenMapped or Always.
     * If backing store is not available on at least one screen, or
     * the string system property "sun.awt.backingStore" is neither "Always"
     * nor "WhenMapped", then the method returns XConstants.NotUseful.
     * Otherwise, if the system property "sun.awt.backingStore" is "WhenMapped",
     * then the method returns XConstants.WhenMapped.
     * Otherwise (i.e., if the system property "sun.awt.backingStore" is "Always"),
     * the method returns XConstants.Always.
     */
    static int getBackingStoreType() {
        return backingStoreType;
    }

    private static void setBackingStoreType() {
        String prop = AccessController.doPrivileged(
                new sun.security.action.GetPropertyAction("sun.awt.backingStore"));

        if (prop == null) {
            backingStoreType = XConstants.NotUseful;
            if (backingStoreLog.isLoggable(PlatformLogger.Level.CONFIG)) {
                backingStoreLog.config("The system property sun.awt.backingStore is not set" +
                                       ", by default backingStore=NotUseful");
            }
            return;
        }

        if (backingStoreLog.isLoggable(PlatformLogger.Level.CONFIG)) {
            backingStoreLog.config("The system property sun.awt.backingStore is " + prop);
        }
        prop = prop.toLowerCase();
        if (prop.equals("always")) {
            backingStoreType = XConstants.Always;
        } else if (prop.equals("whenmapped")) {
            backingStoreType = XConstants.WhenMapped;
        } else {
            backingStoreType = XConstants.NotUseful;
        }

        if (backingStoreLog.isLoggable(PlatformLogger.Level.CONFIG)) {
            backingStoreLog.config("backingStore(as provided by the system property)=" +
                                   ( backingStoreType == XConstants.NotUseful ? "NotUseful"
                                     : backingStoreType == XConstants.WhenMapped ?
                                     "WhenMapped" : "Always") );
        }

        awtLock();
        try {
            int screenCount = XlibWrapper.ScreenCount(getDisplay());
            for (int i = 0; i < screenCount; i++) {
                if (XlibWrapper.DoesBackingStore(XlibWrapper.ScreenOfDisplay(getDisplay(), i))
                        == XConstants.NotUseful) {
                    backingStoreType = XConstants.NotUseful;

                    if (backingStoreLog.isLoggable(PlatformLogger.Level.CONFIG)) {
                        backingStoreLog.config("Backing store is not available on the screen " +
                                               i + ", backingStore=NotUseful");
                    }

                    return;
                }
            }
        } finally {
            awtUnlock();
        }
    }

    
One of XConstants: NotUseful, WhenMapped or Always.
/**
     * One of XConstants: NotUseful, WhenMapped or Always.
     */
    private static int backingStoreType;

    static final int XSUN_KP_BEHAVIOR = 1;
    static final int XORG_KP_BEHAVIOR = 2;
    static final int    IS_SUN_KEYBOARD = 1;
    static final int IS_NONSUN_KEYBOARD = 2;
    static final int    IS_KANA_KEYBOARD = 1;
    static final int IS_NONKANA_KEYBOARD = 2;


    static int     awt_IsXsunKPBehavior = 0;
    static boolean awt_UseXKB         = false;
    static boolean awt_UseXKB_Calls   = false;
    static int     awt_XKBBaseEventCode = 0;
    static int     awt_XKBEffectiveGroup = 0; // so far, I don't use it leaving all calculations
                                              // to XkbTranslateKeyCode
    static long    awt_XKBDescPtr     = 0;

    
Check for Xsun convention regarding numpad keys.
Xsun and some other servers (i.e. derived from Xsun)
under certain conditions process numpad keys unlike Xorg.
/**
     * Check for Xsun convention regarding numpad keys.
     * Xsun and some other servers (i.e. derived from Xsun)
     * under certain conditions process numpad keys unlike Xorg.
     */
    static boolean isXsunKPBehavior() {
        awtLock();
        try {
            if( awt_IsXsunKPBehavior == 0 ) {
                if( XlibWrapper.IsXsunKPBehavior(getDisplay()) ) {
                    awt_IsXsunKPBehavior = XSUN_KP_BEHAVIOR;
                }else{
                    awt_IsXsunKPBehavior = XORG_KP_BEHAVIOR;
                }
            }
            return awt_IsXsunKPBehavior == XSUN_KP_BEHAVIOR ? true : false;
        } finally {
            awtUnlock();
        }
    }

    static int  sunOrNotKeyboard = 0;
    static int kanaOrNotKeyboard = 0;
    static void resetKeyboardSniffer() {
        sunOrNotKeyboard  = 0;
        kanaOrNotKeyboard = 0;
    }
    static boolean isSunKeyboard() {
        if( sunOrNotKeyboard == 0 ) {
            if( XlibWrapper.IsSunKeyboard( getDisplay() )) {
                sunOrNotKeyboard = IS_SUN_KEYBOARD;
            }else{
                sunOrNotKeyboard = IS_NONSUN_KEYBOARD;
            }
        }
        return (sunOrNotKeyboard == IS_SUN_KEYBOARD);
    }
    static boolean isKanaKeyboard() {
        if( kanaOrNotKeyboard == 0 ) {
            if( XlibWrapper.IsKanaKeyboard( getDisplay() )) {
                kanaOrNotKeyboard = IS_KANA_KEYBOARD;
            }else{
                kanaOrNotKeyboard = IS_NONKANA_KEYBOARD;
            }
        }
        return (kanaOrNotKeyboard == IS_KANA_KEYBOARD);
    }
    static boolean isXKBenabled() {
        awtLock();
        try {
            return awt_UseXKB;
        } finally {
            awtUnlock();
        }
    }

    
Query XKEYBOARD extension.
If possible, initialize xkb library.
/**
      Query XKEYBOARD extension.
      If possible, initialize xkb library.
    */
    static boolean tryXKB() {
        awtLock();
        try {
            String name = "XKEYBOARD";
            // First, if there is extension at all.
            awt_UseXKB = XlibWrapper.XQueryExtension( getDisplay(), name, XlibWrapper.larg1, XlibWrapper.larg2, XlibWrapper.larg3);
            if( awt_UseXKB ) {
                // There is a keyboard extension. Check if a client library is compatible.
                // If not, don't use xkb calls.
                // In this case we still may be Xkb-capable application.
                awt_UseXKB_Calls = XlibWrapper.XkbLibraryVersion( XlibWrapper.larg1, XlibWrapper.larg2);
                if( awt_UseXKB_Calls ) {
                    awt_UseXKB_Calls = XlibWrapper.XkbQueryExtension( getDisplay(),  XlibWrapper.larg1, XlibWrapper.larg2,
                                     XlibWrapper.larg3, XlibWrapper.larg4, XlibWrapper.larg5);
                    if( awt_UseXKB_Calls ) {
                        awt_XKBBaseEventCode = Native.getInt(XlibWrapper.larg2);
                        XlibWrapper.XkbSelectEvents (getDisplay(),
                                         XConstants.XkbUseCoreKbd,
                                         XConstants.XkbNewKeyboardNotifyMask |
                                                 XConstants.XkbMapNotifyMask ,//|
                                                 //XConstants.XkbStateNotifyMask,
                                         XConstants.XkbNewKeyboardNotifyMask |
                                                 XConstants.XkbMapNotifyMask );//|
                                                 //XConstants.XkbStateNotifyMask);

                        XlibWrapper.XkbSelectEventDetails(getDisplay(), XConstants.XkbUseCoreKbd,
                                                     XConstants.XkbStateNotify,
                                                     XConstants.XkbGroupStateMask,
                                                     XConstants.XkbGroupStateMask);
                                                     //XXX ? XkbGroupLockMask last, XkbAllStateComponentsMask before last?
                        awt_XKBDescPtr = XlibWrapper.XkbGetMap(getDisplay(),
                                                     XConstants.XkbKeyTypesMask    |
                                                     XConstants.XkbKeySymsMask     |
                                                     XConstants.XkbModifierMapMask |
                                                     XConstants.XkbVirtualModsMask,
                                                     XConstants.XkbUseCoreKbd);

                        XlibWrapper.XkbSetDetectableAutoRepeat(getDisplay(), true);
                    }
                }
            }
            return awt_UseXKB;
        } finally {
            awtUnlock();
        }
    }
    static boolean canUseXKBCalls() {
        awtLock();
        try {
            return awt_UseXKB_Calls;
        } finally {
            awtUnlock();
        }
    }
    static int getXKBEffectiveGroup() {
        awtLock();
        try {
            return awt_XKBEffectiveGroup;
        } finally {
            awtUnlock();
        }
    }
    static int getXKBBaseEventCode() {
        awtLock();
        try {
            return awt_XKBBaseEventCode;
        } finally {
            awtUnlock();
        }
    }
    static long getXKBKbdDesc() {
        awtLock();
        try {
            return awt_XKBDescPtr;
        } finally {
            awtUnlock();
        }
    }
    void freeXKB() {
        awtLock();
        try {
            if (awt_UseXKB_Calls && awt_XKBDescPtr != 0) {
                XlibWrapper.XkbFreeKeyboard(awt_XKBDescPtr, 0xFF, true);
                awt_XKBDescPtr = 0;
            }
        } finally {
            awtUnlock();
        }
    }
    private void processXkbChanges(XEvent ev) {
        // mapping change --> refresh kbd map
        // state change --> get a new effective group; do I really need it
        //  or that should be left for XkbTranslateKeyCode?
        XkbEvent xke = new XkbEvent( ev.getPData() );
        int xkb_type = xke.get_any().get_xkb_type();
        switch( xkb_type ) {
            case XConstants.XkbNewKeyboardNotify :
                 if( awt_XKBDescPtr != 0 ) {
                     freeXKB();
                 }
                 awt_XKBDescPtr = XlibWrapper.XkbGetMap(getDisplay(),
                                              XConstants.XkbKeyTypesMask    |
                                              XConstants.XkbKeySymsMask     |
                                              XConstants.XkbModifierMapMask |
                                              XConstants.XkbVirtualModsMask,
                                              XConstants.XkbUseCoreKbd);
                 //System.out.println("XkbNewKeyboard:"+(xke.get_new_kbd()));
                 break;
            case XConstants.XkbMapNotify :
                 if (awt_XKBDescPtr != 0) {
                    //TODO: provide a simple unit test.
                    XlibWrapper.XkbGetUpdatedMap(getDisplay(),
                                                 XConstants.XkbKeyTypesMask    |
                                                 XConstants.XkbKeySymsMask     |
                                                 XConstants.XkbModifierMapMask |
                                                 XConstants.XkbVirtualModsMask,
                                                 awt_XKBDescPtr);
                 }
                //System.out.println("XkbMap:"+(xke.get_map()));
                 break;
            case XConstants.XkbStateNotify :
                 // May use it later e.g. to obtain an effective group etc.
                 //System.out.println("XkbState:"+(xke.get_state()));
                 break;
            default:
                 //System.out.println("XkbEvent of xkb_type "+xkb_type);
                 break;
        }
    }

    private static long eventNumber;
    public static long getEventNumber() {
        awtLock();
        try {
            return eventNumber;
        } finally {
            awtUnlock();
        }
    }

    private static XEventDispatcher oops_waiter;
    private static boolean oops_updated;
    private static int oops_position = 0;

    
@inheritDoc
/**
     * @inheritDoc
     */
    @Override
    protected boolean syncNativeQueue(final long timeout) {
        XBaseWindow win = XBaseWindow.getXAWTRootWindow();

        if (oops_waiter == null) {
            oops_waiter = new XEventDispatcher() {
                    @Override
                    public void dispatchEvent(XEvent e) {
                        if (e.get_type() == XConstants.ConfigureNotify) {
                            // OOPS ConfigureNotify event catched
                            oops_updated = true;
                            awtLockNotifyAll();
                        }
                    }
                };
        }

        awtLock();
        try {
            addEventDispatcher(win.getWindow(), oops_waiter);

            oops_updated = false;
            long event_number = getEventNumber();
            // Generate OOPS ConfigureNotify event
            XlibWrapper.XMoveWindow(getDisplay(), win.getWindow(),
                                    win.scaleUp(++oops_position), 0);
            // Change win position each time to avoid system optimization
            if (oops_position > 50) {
                oops_position = 0;
            }

            XSync();

            eventLog.finer("Generated OOPS ConfigureNotify event");

            long start = System.currentTimeMillis();
            while (!oops_updated) {
                try {
                    // Wait for OOPS ConfigureNotify event
                    awtLockWait(timeout);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                // This "while" is a protection from spurious
                // wake-ups.  However, we shouldn't wait for too long
                if ((System.currentTimeMillis() - start > timeout) && timeout >= 0) {
                    throw new OperationTimedOut(Long.toString(System.currentTimeMillis() - start));
                }
            }
            // Don't take into account OOPS ConfigureNotify event
            return getEventNumber() - event_number > 1;
        } finally {
            removeEventDispatcher(win.getWindow(), oops_waiter);
            eventLog.finer("Exiting syncNativeQueue");
            awtUnlock();
        }
    }
    @Override
    public void grab(Window w) {
        final Object peer = AWTAccessor.getComponentAccessor().getPeer(w);
        if (peer != null) {
            ((XWindowPeer) peer).setGrab(true);
        }
    }

    @Override
    public void ungrab(Window w) {
        final Object peer = AWTAccessor.getComponentAccessor().getPeer(w);
        if (peer != null) {
            ((XWindowPeer) peer).setGrab(false);
        }
    }
    
Returns if the java.awt.Desktop class is supported on the current
desktop.

The methods of java.awt.Desktop class are supported on the Gnome desktop.
Check if the running desktop is Gnome by checking the window manager.
/**
     * Returns if the java.awt.Desktop class is supported on the current
     * desktop.
     * <p>
     * The methods of java.awt.Desktop class are supported on the Gnome desktop.
     * Check if the running desktop is Gnome by checking the window manager.
     */
    @Override
    public boolean isDesktopSupported(){
        return XDesktopPeer.isDesktopSupported();
    }

    @Override
    public DesktopPeer createDesktopPeer(Desktop target){
        return new XDesktopPeer();
    }

    @Override
    public boolean isTaskbarSupported(){
        return XTaskbarPeer.isTaskbarSupported();
    }

    @Override
    public TaskbarPeer createTaskbarPeer(Taskbar target){
        return new XTaskbarPeer();
    }

    @Override
    public boolean areExtraMouseButtonsEnabled() throws HeadlessException {
        return areExtraMouseButtonsEnabled;
    }

    @Override
    public boolean isWindowOpacitySupported() {
        XNETProtocol net_protocol = XWM.getWM().getNETProtocol();

        if (net_protocol == null) {
            return false;
        }

        return net_protocol.doOpacityProtocol();
    }

    @Override
    public boolean isWindowShapingSupported() {
        return XlibUtil.isShapingSupported();
    }

    @Override
    public boolean isWindowTranslucencySupported() {
        //NOTE: it may not be supported. The actual check is being performed
        //      at java.awt.GraphicsDevice. In X11 we need to check
        //      whether there's any translucency-capable GC available.
        return true;
    }

    @Override
    public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
        if (!(gc instanceof X11GraphicsConfig)) {
            return false;
        }
        return ((X11GraphicsConfig)gc).isTranslucencyCapable();
    }

    
Returns the value of "sun.awt.disablegrab" property. Default value is false. /**
     * Returns the value of "sun.awt.disablegrab" property. Default
     * value is {@code false}.
     */
    public static boolean getSunAwtDisableGrab() {
        return AccessController.doPrivileged(new GetBooleanAction("sun.awt.disablegrab"));
    }
}