awt/X11/XComponentPeer.java

/*
 * Copyright (c) 2002, 2013, 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.AWTEvent;
import java.awt.AWTException;
import java.awt.BufferCapabilities;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.SystemColor;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.dnd.DropTarget;
import java.awt.dnd.peer.DropTargetPeer;
import java.awt.event.FocusEvent;
import java.awt.event.InputEvent;
import java.awt.event.InputMethodEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseWheelEvent;
import java.awt.event.PaintEvent;
import java.awt.event.WindowEvent;
import java.awt.event.InvocationEvent;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.image.VolatileImage;
import java.awt.peer.ComponentPeer;
import java.awt.peer.ContainerPeer;
import java.lang.reflect.*;
import java.security.*;
import java.util.Collection;
import java.util.Objects;
import java.util.Set;
import sun.util.logging.PlatformLogger;
import sun.awt.*;
import sun.awt.event.IgnorePaintEvent;
import sun.awt.image.SunVolatileImage;
import sun.awt.image.ToolkitImage;
import sun.java2d.BackBufferCapsProvider;
import sun.java2d.pipe.Region;


public class XComponentPeer extends XWindow implements ComponentPeer, DropTargetPeer,
    BackBufferCapsProvider
{
    private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.X11.XComponentPeer");
    private static final PlatformLogger buffersLog = PlatformLogger.getLogger("sun.awt.X11.XComponentPeer.multibuffer");
    private static final PlatformLogger focusLog = PlatformLogger.getLogger("sun.awt.X11.focus.XComponentPeer");
    private static final PlatformLogger fontLog = PlatformLogger.getLogger("sun.awt.X11.font.XComponentPeer");
    private static final PlatformLogger enableLog = PlatformLogger.getLogger("sun.awt.X11.enable.XComponentPeer");
    private static final PlatformLogger shapeLog = PlatformLogger.getLogger("sun.awt.X11.shape.XComponentPeer");

    boolean paintPending = false;
    boolean isLayouting = false;
    private boolean enabled;

    // Actually used only by XDecoratedPeer
    protected int boundsOperation;

    Color foreground;
    Color background;

    // Colors calculated as on Motif using MotifColorUtilties.
    // If you use these, call updateMotifColors() in the peer's Constructor and
    // setBackground().  Examples are XCheckboxPeer and XButtonPeer.
    Color darkShadow;
    Color lightShadow;
    Color selectColor;

    Font font;
    private long backBuffer = 0;
    private VolatileImage xBackBuffer = null;

    static Color[] systemColors;

    XComponentPeer() {
    }

    XComponentPeer (XCreateWindowParams params) {
        super(params);
    }

    XComponentPeer(Component target, long parentWindow, Rectangle bounds) {
        super(target, parentWindow, bounds);
    }

    /**
     * Standard peer constructor, with corresponding Component
     */
    XComponentPeer(Component target) {
        super(target);
    }


    void preInit(XCreateWindowParams params) {
        super.preInit(params);
        boundsOperation = DEFAULT_OPERATION;
    }
    void postInit(XCreateWindowParams params) {
        super.postInit(params);

        pSetCursor(target.getCursor());

        foreground = target.getForeground();
        background = target.getBackground();
        font = target.getFont();

        if (isInitialReshape()) {
            Rectangle r = target.getBounds();
            reshape(r.x, r.y, r.width, r.height);
        }

        setEnabled(target.isEnabled());

        if (target.isVisible()) {
            setVisible(true);
        }
    }

    protected boolean isInitialReshape() {
        return true;
    }

    public void reparent(ContainerPeer newNativeParent) {
        XComponentPeer newPeer = (XComponentPeer)newNativeParent;
        XToolkit.awtLock();
        try {
            XlibWrapper.XReparentWindow(XToolkit.getDisplay(), getWindow(), newPeer.getContentWindow(), x, y);
            parentWindow = newPeer;
        } finally {
            XToolkit.awtUnlock();
        }
    }
    public boolean isReparentSupported() {
        return System.getProperty("sun.awt.X11.XComponentPeer.reparentNotSupported", "false").equals("false");
    }

    public boolean isObscured() {
        Container container  = (target instanceof Container) ?
            (Container)target : target.getParent();

        if (container == null) {
            return true;
        }

        Container parent;
        while ((parent = container.getParent()) != null) {
            container = parent;
        }

        if (container instanceof Window) {
            XWindowPeer wpeer = (XWindowPeer)(container.getPeer());
            if (wpeer != null) {
                return (wpeer.winAttr.visibilityState !=
                        wpeer.winAttr.AWT_UNOBSCURED);
            }
        }
        return true;
    }

    public boolean canDetermineObscurity() {
        return true;
    }

    /*************************************************
     * FOCUS STUFF
     *************************************************/

    /**
     * Keeps the track of focused state of the _NATIVE_ window
     */
    boolean bHasFocus = false;

    /**
     * Descendants should use this method to determine whether or not native window
     * has focus.
     */
    final public boolean hasFocus() {
        return bHasFocus;
    }

    /**
     * Called when component receives focus
     */
    public void focusGained(FocusEvent e) {
        if (focusLog.isLoggable(PlatformLogger.Level.FINE)) {
            focusLog.fine("{0}", e);
        }
        bHasFocus = true;
    }

    /**
     * Called when component loses focus
     */
    public void focusLost(FocusEvent e) {
        if (focusLog.isLoggable(PlatformLogger.Level.FINE)) {
            focusLog.fine("{0}", e);
        }
        bHasFocus = false;
    }

    public boolean isFocusable() {
        /* should be implemented by other sub-classes */
        return false;
    }

    private static Class seClass;
    private static Constructor seCtor;

    final static AWTEvent wrapInSequenced(AWTEvent event) {
        try {
            if (seClass == null) {
                seClass = Class.forName("java.awt.SequencedEvent");
            }

            if (seCtor == null) {
                seCtor = (Constructor) AccessController.doPrivileged(new PrivilegedExceptionAction() {
                        public Object run() throws Exception {
                            Constructor ctor = seClass.getConstructor(new Class[] { AWTEvent.class });
                            ctor.setAccessible(true);
                            return ctor;
                        }
                    });
            }

            return (AWTEvent) seCtor.newInstance(new Object[] { event });
        }
        catch (ClassNotFoundException e) {
            throw new NoClassDefFoundError("java.awt.SequencedEvent.");
        }
        catch (PrivilegedActionException ex) {
            throw new NoClassDefFoundError("java.awt.SequencedEvent.");
        }
        catch (InstantiationException e) {
            assert false;
        }
        catch (IllegalAccessException e) {
            assert false;
        }
        catch (InvocationTargetException e) {
            assert false;
        }

        return null;
    }

    // TODO: consider moving it to KeyboardFocusManagerPeerImpl
    final public boolean requestFocus(Component lightweightChild, boolean temporary,
                                      boolean focusedWindowChangeAllowed, long time,
                                      CausedFocusEvent.Cause cause)
    {
        if (XKeyboardFocusManagerPeer.
            processSynchronousLightweightTransfer(target, lightweightChild, temporary,
                                                  focusedWindowChangeAllowed, time))
        {
            return true;
        }

        int result = XKeyboardFocusManagerPeer.
            shouldNativelyFocusHeavyweight(target, lightweightChild,
                                           temporary, focusedWindowChangeAllowed,
                                           time, cause);

        switch (result) {
          case XKeyboardFocusManagerPeer.SNFH_FAILURE:
              return false;
          case XKeyboardFocusManagerPeer.SNFH_SUCCESS_PROCEED:
              // Currently we just generate focus events like we deal with lightweight instead of calling
              // XSetInputFocus on native window
              if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
                  focusLog.finer("Proceeding with request to " +
                                 lightweightChild + " in " + target);
              }
              /**
               * The problems with requests in non-focused window arise because shouldNativelyFocusHeavyweight
               * checks that native window is focused while appropriate WINDOW_GAINED_FOCUS has not yet
               * been processed - it is in EventQueue. Thus, SNFH allows native request and stores request record
               * in requests list - and it breaks our requests sequence as first record on WGF should be the last
               * focus owner which had focus before WLF. So, we should not add request record for such requests
               * but store this component in mostRecent - and return true as before for compatibility.
               */
              Window parentWindow = SunToolkit.getContainingWindow(target);
              if (parentWindow == null) {
                  return rejectFocusRequestHelper("WARNING: Parent window is null");
              }
              XWindowPeer wpeer = (XWindowPeer)parentWindow.getPeer();
              if (wpeer == null) {
                  return rejectFocusRequestHelper("WARNING: Parent window's peer is null");
              }
              /*
               * Passing null 'actualFocusedWindow' as we don't want to restore focus on it
               * when a component inside a Frame is requesting focus.
               * See 6314575 for details.
               */
              boolean res = wpeer.requestWindowFocus(null);

              if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
                  focusLog.finer("Requested window focus: " + res);
              }
              // If parent window can be made focused and has been made focused(synchronously)
              // then we can proceed with children, otherwise we retreat.
              if (!(res && parentWindow.isFocused())) {
                  return rejectFocusRequestHelper("Waiting for asynchronous processing of the request");
              }
              return XKeyboardFocusManagerPeer.deliverFocus(lightweightChild,
                                                            (Component)target,
                                                            temporary,
                                                            focusedWindowChangeAllowed,
                                                            time, cause);
              // Motif compatibility code
          case XKeyboardFocusManagerPeer.SNFH_SUCCESS_HANDLED:
              // Either lightweight or excessive request - all events are generated.
              return true;
        }
        return false;
    }

    private boolean rejectFocusRequestHelper(String logMsg) {
        if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
            focusLog.finer(logMsg);
        }
        XKeyboardFocusManagerPeer.removeLastFocusRequest(target);
        return false;
    }

    void handleJavaFocusEvent(AWTEvent e) {
        if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
            focusLog.finer(e.toString());
        }
        if (e.getID() == FocusEvent.FOCUS_GAINED) {
            focusGained((FocusEvent)e);
        } else {
            focusLost((FocusEvent)e);
        }
    }

    void handleJavaWindowFocusEvent(AWTEvent e) {
    }

    /*************************************************
     * END OF FOCUS STUFF
     *************************************************/


    public void setVisible(boolean b) {
        xSetVisible(b);
    }

    public void hide() {
        setVisible(false);
    }

    /**
     * @see java.awt.peer.ComponentPeer
     */
    public void setEnabled(final boolean value) {
        if (enableLog.isLoggable(PlatformLogger.Level.FINE)) {
            enableLog.fine("{0}ing {1}", (value ? "Enabl" : "Disabl"), this);
        }
        boolean status = value;
        // If any of our heavyweight ancestors are disable, we should be too
        // See 6176875 for more information
        final Container cp = SunToolkit.getNativeContainer(target);
        if (cp != null) {
            status &= ((XComponentPeer) cp.getPeer()).isEnabled();
        }
        synchronized (getStateLock()) {
            if (enabled == status) {
                return;
            }
            enabled = status;
        }

        if (target instanceof Container) {
            final Component[] list = ((Container) target).getComponents();
            for (final Component child : list) {
                final ComponentPeer p = child.getPeer();
                if (p != null) {
                    p.setEnabled(status && child.isEnabled());
                }
            }
        }
        repaint();
    }

    //
    // public so aw/Window can call it
    //
    public final boolean isEnabled() {
        synchronized (getStateLock()) {
            return enabled;
        }
    }

    @Override
    public void paint(final Graphics g) {
        super.paint(g);
        // allow target to change the picture
        target.paint(g);
    }

    public Graphics getGraphics() {
        return getGraphics(surfaceData, getPeerForeground(), getPeerBackground(), getPeerFont());
    }
    public void print(Graphics g) {
        // clear rect here to emulate X clears rect before Expose
        g.setColor(target.getBackground());
        g.fillRect(0, 0, target.getWidth(), target.getHeight());
        g.setColor(target.getForeground());
        // paint peer
        paintPeer(g);
        // allow target to change the picture
        target.print(g);
    }

    public void setBounds(int x, int y, int width, int height, int op) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        xSetBounds(x,y,width,height);
        validateSurface();
        layout();
    }

    public void reshape(int x, int y, int width, int height) {
        setBounds(x, y, width, height, SET_BOUNDS);
    }

    public void coalescePaintEvent(PaintEvent e) {
        Rectangle r = e.getUpdateRect();
        if (!(e instanceof IgnorePaintEvent)) {
            paintArea.add(r, e.getID());
        }
        if (true) {
            switch(e.getID()) {
              case PaintEvent.UPDATE:
                  if (log.isLoggable(PlatformLogger.Level.FINER)) {
                      log.finer("XCP coalescePaintEvent : UPDATE : add : x = " +
                            r.x + ", y = " + r.y + ", width = " + r.width + ",height = " + r.height);
                  }
                  return;
              case PaintEvent.PAINT:
                  if (log.isLoggable(PlatformLogger.Level.FINER)) {
                      log.finer("XCP coalescePaintEvent : PAINT : add : x = " +
                            r.x + ", y = " + r.y + ", width = " + r.width + ",height = " + r.height);
                  }
                  return;
            }
        }
    }

    XWindowPeer getParentTopLevel() {
        AWTAccessor.ComponentAccessor compAccessor = AWTAccessor.getComponentAccessor();
        Container parent = (target instanceof Container) ? ((Container)target) : (compAccessor.getParent(target));
        // Search for parent window
        while (parent != null && !(parent instanceof Window)) {
            parent = compAccessor.getParent(parent);
        }
        if (parent != null) {
            return (XWindowPeer)compAccessor.getPeer(parent);
        } else {
            return null;
        }
    }

    /* This method is intended to be over-ridden by peers to perform user interaction */
    void handleJavaMouseEvent(MouseEvent e) {
        switch (e.getID()) {
          case MouseEvent.MOUSE_PRESSED:
              if (target == e.getSource() &&
                  !target.isFocusOwner() &&
                  XKeyboardFocusManagerPeer.shouldFocusOnClick(target))
              {
                  XWindowPeer parentXWindow = getParentTopLevel();
                  Window parentWindow = ((Window)parentXWindow.getTarget());
                  // Simple windows are non-focusable in X terms but focusable in Java terms.
                  // As X-non-focusable they don't receive any focus events - we should generate them
                  // by ourselfves.
//                   if (parentXWindow.isFocusableWindow() /*&& parentXWindow.isSimpleWindow()*/ &&
//                       !(getCurrentNativeFocusedWindow() == parentWindow))
//                   {
//                       setCurrentNativeFocusedWindow(parentWindow);
//                       WindowEvent wfg = new WindowEvent(parentWindow, WindowEvent.WINDOW_GAINED_FOCUS);
//                       parentWindow.dispatchEvent(wfg);
//                   }
                  XKeyboardFocusManagerPeer.requestFocusFor(target, CausedFocusEvent.Cause.MOUSE_EVENT);
              }
              break;
        }
    }

    /* This method is intended to be over-ridden by peers to perform user interaction */
    void handleJavaKeyEvent(KeyEvent e) {
    }

    /* This method is intended to be over-ridden by peers to perform user interaction */
    void handleJavaMouseWheelEvent(MouseWheelEvent e) {
    }


    /* This method is intended to be over-ridden by peers to perform user interaction */
    void handleJavaInputMethodEvent(InputMethodEvent e) {
    }

    void handleF10JavaKeyEvent(KeyEvent e) {
        if (e.getID() == KeyEvent.KEY_PRESSED && e.getKeyCode() == KeyEvent.VK_F10) {
            XWindowPeer winPeer = this.getToplevelXWindow();
            if (winPeer instanceof XFramePeer) {
                XMenuBarPeer mPeer = ((XFramePeer)winPeer).getMenubarPeer();
                if (mPeer != null) {
                    mPeer.handleF10KeyPress(e);
                }
            }
        }
    }

    public void handleEvent(java.awt.AWTEvent e) {
        if ((e instanceof InputEvent) && !((InputEvent)e).isConsumed() && target.isEnabled())  {
            if (e instanceof MouseEvent) {
                if (e instanceof MouseWheelEvent) {
                    handleJavaMouseWheelEvent((MouseWheelEvent) e);
                }
                else
                    handleJavaMouseEvent((MouseEvent) e);
            }
            else if (e instanceof KeyEvent) {
                handleF10JavaKeyEvent((KeyEvent)e);
                handleJavaKeyEvent((KeyEvent)e);
            }
        }
        else if (e instanceof KeyEvent && !((InputEvent)e).isConsumed()) {
            // even if target is disabled.
            handleF10JavaKeyEvent((KeyEvent)e);
        }
        else if (e instanceof InputMethodEvent) {
            handleJavaInputMethodEvent((InputMethodEvent) e);
        }

        int id = e.getID();

        switch(id) {
          case PaintEvent.PAINT:
              // Got native painting
              paintPending = false;
              // Fallthrough to next statement
          case PaintEvent.UPDATE:
              // Skip all painting while layouting and all UPDATEs
              // while waiting for native paint
              if (!isLayouting && !paintPending) {
                  paintArea.paint(target,false);
              }
              return;
          case FocusEvent.FOCUS_LOST:
          case FocusEvent.FOCUS_GAINED:
              handleJavaFocusEvent(e);
              break;
          case WindowEvent.WINDOW_LOST_FOCUS:
          case WindowEvent.WINDOW_GAINED_FOCUS:
              handleJavaWindowFocusEvent(e);
              break;
          default:
              break;
        }

    }

    public Dimension getMinimumSize() {
        return target.getSize();
    }

    public Dimension getPreferredSize() {
        return getMinimumSize();
    }

    public void layout() {}

    void updateMotifColors(Color bg) {
        int red = bg.getRed();
        int green = bg.getGreen();
        int blue = bg.getBlue();

        darkShadow = new Color(MotifColorUtilities.calculateBottomShadowFromBackground(red,green,blue));
        lightShadow = new Color(MotifColorUtilities.calculateTopShadowFromBackground(red,green,blue));
        selectColor= new Color(MotifColorUtilities.calculateSelectFromBackground(red,green,blue));
    }

    /*
     * Draw a 3D rectangle using the Motif colors.
     * "Normal" rectangles have shadows on the bottom.
     * "Depressed" rectangles (such as pressed buttons) have shadows on the top,
     * in which case true should be passed for topShadow.
     */
    public void drawMotif3DRect(Graphics g,
                                          int x, int y, int width, int height,
                                          boolean topShadow) {
        g.setColor(topShadow ? darkShadow : lightShadow);
        g.drawLine(x, y, x+width, y);       // top
        g.drawLine(x, y+height, x, y);      // left

        g.setColor(topShadow ? lightShadow : darkShadow );
        g.drawLine(x+1, y+height, x+width, y+height); // bottom
        g.drawLine(x+width, y+height, x+width, y+1);  // right
    }

    @Override
    public void setBackground(Color c) {
        if (log.isLoggable(PlatformLogger.Level.FINE)) {
            log.fine("Set background to " + c);
        }
        synchronized (getStateLock()) {
            if (Objects.equals(background, c)) {
                return;
            }
            background = c;
        }
        super.setBackground(c);
        repaint();
    }

    @Override
    public void setForeground(Color c) {
        if (log.isLoggable(PlatformLogger.Level.FINE)) {
            log.fine("Set foreground to " + c);
        }
        synchronized (getStateLock()) {
            if (Objects.equals(foreground, c)) {
                return;
            }
            foreground = c;
        }
        repaint();
    }

    /**
     * Gets the font metrics for the specified font.
     * @param font the font for which font metrics is to be
     *      obtained
     * @return the font metrics for <code>font</code>
     * @see       #getFont
     * @see       #getPeer
     * @see       java.awt.peer.ComponentPeer#getFontMetrics(Font)
     * @see       Toolkit#getFontMetrics(Font)
     * @since     JDK1.0
     */
    public FontMetrics getFontMetrics(Font font) {
        if (fontLog.isLoggable(PlatformLogger.Level.FINE)) {
            fontLog.fine("Getting font metrics for " + font);
        }
        return sun.font.FontDesignMetrics.getMetrics(font);
    }

    @Override
    public void setFont(Font f) {
        if (f == null) {
            f = XWindow.getDefaultFont();
        }
        synchronized (getStateLock()) {
            if (f.equals(font)) {
                return;
            }
            font = f;
        }
        // as it stands currently we don't need to do layout since
        // layout is done in the Component upon setFont.
        //layout();
        repaint();
    }

    public Font getFont() {
        return font;
    }

    public void updateCursorImmediately() {
        XGlobalCursorManager.getCursorManager().updateCursorImmediately();
    }

    public final void pSetCursor(Cursor cursor) {
        this.pSetCursor(cursor, true);
    }

    /*
     * The method changes the cursor.
     * @param cursor - a new cursor to change to.
     * @param ignoreSubComponents - if {@code true} is passed then
     *                              the new cursor will be installed on window.
     *                              if {@code false} is passed then
     *                              subsequent components will try to handle
     *                              this request and install their cursor.
     */
    //ignoreSubComponents not used here
    public void pSetCursor(Cursor cursor, boolean ignoreSubComponents) {
        XToolkit.awtLock();
        try {
            long xcursor = XGlobalCursorManager.getCursor(cursor);

            XSetWindowAttributes xwa = new XSetWindowAttributes();
            xwa.set_cursor(xcursor);

            long valuemask = XConstants.CWCursor;

            XlibWrapper.XChangeWindowAttributes(XToolkit.getDisplay(),getWindow(),valuemask,xwa.pData);
            XlibWrapper.XFlush(XToolkit.getDisplay());
            xwa.dispose();
        } finally {
            XToolkit.awtUnlock();
        }
    }

    public Image createImage(ImageProducer producer) {
        return new ToolkitImage(producer);
    }

    public Image createImage(int width, int height) {
        return graphicsConfig.createAcceleratedImage(target, width, height);
    }

    public VolatileImage createVolatileImage(int width, int height) {
        return new SunVolatileImage(target, width, height);
    }

    public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
        return Toolkit.getDefaultToolkit().prepareImage(img, w, h, o);
    }

    public int checkImage(Image img, int w, int h, ImageObserver o) {
        return Toolkit.getDefaultToolkit().checkImage(img, w, h, o);
    }

    public Dimension preferredSize() {
        return getPreferredSize();
    }

    public Dimension minimumSize() {
        return getMinimumSize();
    }

    public Insets getInsets() {
        return new Insets(0, 0, 0, 0);
    }

    public void beginValidate() {
    }

    public void endValidate() {
    }


    /**
     * DEPRECATED:  Replaced by getInsets().
     */

    public Insets insets() {
        return getInsets();
    }

    // Returns true if we are inside begin/endLayout and
    // are waiting for native painting
    public boolean isPaintPending() {
        return paintPending && isLayouting;
    }

    public boolean handlesWheelScrolling() {
        return false;
    }

    public void beginLayout() {
        // Skip all painting till endLayout
        isLayouting = true;

    }

    public void endLayout() {
        if (!paintPending && !paintArea.isEmpty()
            && !AWTAccessor.getComponentAccessor().getIgnoreRepaint(target))
        {
            // if not waiting for native painting repaint damaged area
            postEvent(new PaintEvent(target, PaintEvent.PAINT,
                                     new Rectangle()));
        }
        isLayouting = false;
    }

    public Color getWinBackground() {
        return getPeerBackground();
    }

    static int[] getRGBvals(Color c) {

        int rgbvals[] = new int[3];

        rgbvals[0] = c.getRed();
        rgbvals[1] = c.getGreen();
        rgbvals[2] = c.getBlue();

        return rgbvals;
    }

    static final int BACKGROUND_COLOR = 0;
    static final int HIGHLIGHT_COLOR = 1;
    static final int SHADOW_COLOR = 2;
    static final int FOREGROUND_COLOR = 3;

    public Color[] getGUIcolors() {
        Color c[] = new Color[4];
        float backb, highb, shadowb, hue, saturation;
        c[BACKGROUND_COLOR] = getWinBackground();
        if (c[BACKGROUND_COLOR] == null) {
            c[BACKGROUND_COLOR] = super.getWinBackground();
        }
        if (c[BACKGROUND_COLOR] == null) {
            c[BACKGROUND_COLOR] = Color.lightGray;
        }

        int[] rgb = getRGBvals(c[BACKGROUND_COLOR]);

        float[] hsb = Color.RGBtoHSB(rgb[0],rgb[1],rgb[2],null);

        hue = hsb[0];
        saturation = hsb[1];
        backb = hsb[2];


/*      Calculate Highlight Brightness  */

        highb = backb + 0.2f;
        shadowb = backb - 0.4f;
        if ((highb > 1.0) ) {
            if  ((1.0 - backb) < 0.05) {
                highb = shadowb + 0.25f;
            } else {
                highb = 1.0f;
            }
        } else {
            if (shadowb < 0.0) {
                if ((backb - 0.0) < 0.25) {
                    highb = backb + 0.75f;
                    shadowb = highb - 0.2f;
                } else {
                    shadowb = 0.0f;
                }
            }
        }
        c[HIGHLIGHT_COLOR] = Color.getHSBColor(hue,saturation,highb);
        c[SHADOW_COLOR] = Color.getHSBColor(hue,saturation,shadowb);


/*
  c[SHADOW_COLOR] = c[BACKGROUND_COLOR].darker();
  int r2 = c[SHADOW_COLOR].getRed();
  int g2 = c[SHADOW_COLOR].getGreen();
  int b2 = c[SHADOW_COLOR].getBlue();
*/

        c[FOREGROUND_COLOR] = getPeerForeground();
        if (c[FOREGROUND_COLOR] == null) {
            c[FOREGROUND_COLOR] = Color.black;
        }
/*
  if ((c[BACKGROUND_COLOR].equals(c[HIGHLIGHT_COLOR]))
  && (c[BACKGROUND_COLOR].equals(c[SHADOW_COLOR]))) {
  c[SHADOW_COLOR] = new Color(c[BACKGROUND_COLOR].getRed() + 75,
  c[BACKGROUND_COLOR].getGreen() + 75,
  c[BACKGROUND_COLOR].getBlue() + 75);
  c[HIGHLIGHT_COLOR] = c[SHADOW_COLOR].brighter();
  } else if (c[BACKGROUND_COLOR].equals(c[HIGHLIGHT_COLOR])) {
  c[HIGHLIGHT_COLOR] = c[SHADOW_COLOR];
  c[SHADOW_COLOR] = c[SHADOW_COLOR].darker();
  }
*/
        if (! isEnabled()) {
            c[BACKGROUND_COLOR] = c[BACKGROUND_COLOR].darker();
            // Reduce the contrast
            // Calculate the NTSC gray (NB: REC709 L* might be better!)
            // for foreground and background; then multiply the foreground
            // by the average lightness


            Color tc = c[BACKGROUND_COLOR];
            int bg = tc.getRed() * 30 + tc.getGreen() * 59 + tc.getBlue() * 11;

            tc = c[FOREGROUND_COLOR];
            int fg = tc.getRed() * 30 + tc.getGreen() * 59 + tc.getBlue() * 11;

            float ave = (float) ((fg + bg) / 51000.0);
            // 255 * 100 * 2

            Color newForeground = new Color((int) (tc.getRed() * ave),
                                            (int) (tc.getGreen() * ave),
                                            (int) (tc.getBlue() * ave));

            if (newForeground.equals(c[FOREGROUND_COLOR])) {
                // This probably means the foreground color is black or white
                newForeground = new Color(ave, ave, ave);
            }
            c[FOREGROUND_COLOR] = newForeground;

        }


        return c;
    }

    /**
     * Returns an array of Colors similar to getGUIcolors(), but using the
     * System colors.  This is useful if pieces of a Component (such as
     * the integrated scrollbars of a List) should retain the System color
     * instead of the background color set by Component.setBackground().
     */
    static Color[] getSystemColors() {
        if (systemColors == null) {
            systemColors = new Color[4];
            systemColors[BACKGROUND_COLOR] = SystemColor.window;
            systemColors[HIGHLIGHT_COLOR] = SystemColor.controlLtHighlight;
            systemColors[SHADOW_COLOR] = SystemColor.controlShadow;
            systemColors[FOREGROUND_COLOR] = SystemColor.windowText;
        }
        return systemColors;
    }

    /**
     * Draw a 3D oval.
     */
    public void draw3DOval(Graphics g, Color colors[],
                           int x, int y, int w, int h, boolean raised)
        {
        Color c = g.getColor();
        g.setColor(raised ? colors[HIGHLIGHT_COLOR] : colors[SHADOW_COLOR]);
        g.drawArc(x, y, w, h, 45, 180);
        g.setColor(raised ? colors[SHADOW_COLOR] : colors[HIGHLIGHT_COLOR]);
        g.drawArc(x, y, w, h, 225, 180);
        g.setColor(c);
    }

    public void draw3DRect(Graphics g, Color colors[],
                           int x, int y, int width, int height, boolean raised)
        {
            Color c = g.getColor();
            g.setColor(raised ? colors[HIGHLIGHT_COLOR] : colors[SHADOW_COLOR]);
            g.drawLine(x, y, x, y + height);
            g.drawLine(x + 1, y, x + width - 1, y);
            g.setColor(raised ? colors[SHADOW_COLOR] : colors[HIGHLIGHT_COLOR]);
            g.drawLine(x + 1, y + height, x + width, y + height);
            g.drawLine(x + width, y, x + width, y + height - 1);
            g.setColor(c);
        }

    /*
     * drawXXX() methods are used to print the native components by
     * rendering the Motif look ourselves.
     * ToDo(aim): needs to query native motif for more accurate color
     * information.
     */
    void draw3DOval(Graphics g, Color bg,
                    int x, int y, int w, int h, boolean raised)
        {
            Color c = g.getColor();
            Color shadow = bg.darker();
            Color highlight = bg.brighter();

            g.setColor(raised ? highlight : shadow);
            g.drawArc(x, y, w, h, 45, 180);
            g.setColor(raised ? shadow : highlight);
            g.drawArc(x, y, w, h, 225, 180);
            g.setColor(c);
        }

    void draw3DRect(Graphics g, Color bg,
                    int x, int y, int width, int height,
                    boolean raised) {
        Color c = g.getColor();
        Color shadow = bg.darker();
        Color highlight = bg.brighter();

        g.setColor(raised ? highlight : shadow);
        g.drawLine(x, y, x, y + height);
        g.drawLine(x + 1, y, x + width - 1, y);
        g.setColor(raised ? shadow : highlight);
        g.drawLine(x + 1, y + height, x + width, y + height);
        g.drawLine(x + width, y, x + width, y + height - 1);
        g.setColor(c);
    }

    void drawScrollbar(Graphics g, Color bg, int thickness, int length,
               int min, int max, int val, int vis, boolean horizontal) {
        Color c = g.getColor();
        double f = (double)(length - 2*(thickness-1)) / Math.max(1, ((max - min) + vis));
        int v1 = thickness + (int)(f * (val - min));
        int v2 = (int)(f * vis);
        int w2 = thickness-4;
        int tpts_x[] = new int[3];
        int tpts_y[] = new int[3];

        if (length < 3*w2 ) {
            v1 = v2 = 0;
            if (length < 2*w2 + 2) {
                w2 = (length-2)/2;
            }
        } else  if (v2 < 7) {
            // enforce a minimum handle size
            v1 = Math.max(0, v1 - ((7 - v2)>>1));
            v2 = 7;
        }

        int ctr   = thickness/2;
        int sbmin = ctr - w2/2;
        int sbmax = ctr + w2/2;

        // paint the background slightly darker
        {
            Color d = new Color((int) (bg.getRed()   * 0.85),
                                (int) (bg.getGreen() * 0.85),
                                (int) (bg.getBlue()  * 0.85));

            g.setColor(d);
            if (horizontal) {
                g.fillRect(0, 0, length, thickness);
            } else {
                g.fillRect(0, 0, thickness, length);
            }
        }

        // paint the thumb and arrows in the normal background color
        g.setColor(bg);
        if (v1 > 0) {
            if (horizontal) {
                g.fillRect(v1, 3, v2, thickness-3);
            } else {
                g.fillRect(3, v1, thickness-3, v2);
            }
        }

        tpts_x[0] = ctr;    tpts_y[0] = 2;
        tpts_x[1] = sbmin;  tpts_y[1] = w2;
        tpts_x[2] = sbmax;  tpts_y[2] = w2;
        if (horizontal) {
            g.fillPolygon(tpts_y, tpts_x, 3);
        } else {
            g.fillPolygon(tpts_x, tpts_y, 3);
        }

        tpts_y[0] = length-2;
        tpts_y[1] = length-w2;
        tpts_y[2] = length-w2;
        if (horizontal) {
            g.fillPolygon(tpts_y, tpts_x, 3);
        } else {
            g.fillPolygon(tpts_x, tpts_y, 3);
        }

        Color highlight = bg.brighter();

        // // // // draw the "highlighted" edges
        g.setColor(highlight);

        // outline & arrows
        if (horizontal) {
            g.drawLine(1, thickness, length - 1, thickness);
            g.drawLine(length - 1, 1, length - 1, thickness);

            // arrows
            g.drawLine(1, ctr, w2, sbmin);
            g.drawLine(length - w2, sbmin, length - w2, sbmax);
            g.drawLine(length - w2, sbmin, length - 2, ctr);

        } else {
            g.drawLine(thickness, 1, thickness, length - 1);
            g.drawLine(1, length - 1, thickness, length - 1);

            // arrows
            g.drawLine(ctr, 1, sbmin, w2);
            g.drawLine(sbmin, length - w2, sbmax, length - w2);
            g.drawLine(sbmin, length - w2, ctr, length - 2);
        }

        // thumb
        if (v1 > 0) {
            if (horizontal) {
                g.drawLine(v1, 2, v1 + v2, 2);
                g.drawLine(v1, 2, v1, thickness-3);
            } else {
                g.drawLine(2, v1, 2, v1 + v2);
                g.drawLine(2, v1, thickness-3, v1);
            }
        }

        Color shadow = bg.darker();

        // // // // draw the "shadowed" edges
        g.setColor(shadow);

        // outline && arrows
        if (horizontal) {
            g.drawLine(0, 0, 0, thickness);
            g.drawLine(0, 0, length - 1, 0);

            // arrows
            g.drawLine(w2, sbmin, w2, sbmax);
            g.drawLine(w2, sbmax, 1, ctr);
            g.drawLine(length-2, ctr, length-w2, sbmax);

        } else {
            g.drawLine(0, 0, thickness, 0);
            g.drawLine(0, 0, 0, length - 1);

            // arrows
            g.drawLine(sbmin, w2, sbmax, w2);
            g.drawLine(sbmax, w2, ctr, 1);
            g.drawLine(ctr, length-2, sbmax, length-w2);
        }

        // thumb
        if (v1 > 0) {
            if (horizontal) {
                g.drawLine(v1 + v2, 2, v1 + v2, thickness-2);
                g.drawLine(v1, thickness-2, v1 + v2, thickness-2);
            } else {
                g.drawLine(2, v1 + v2, thickness-2, v1 + v2);
                g.drawLine(thickness-2, v1, thickness-2, v1 + v2);
            }
        }
        g.setColor(c);
    }

    /**
     * The following multibuffering-related methods delegate to our
     * associated GraphicsConfig (X11 or GLX) to handle the appropriate
     * native windowing system specific actions.
     */

    private BufferCapabilities backBufferCaps;

    public void createBuffers(int numBuffers, BufferCapabilities caps)
      throws AWTException
    {
        if (buffersLog.isLoggable(PlatformLogger.Level.FINE)) {
            buffersLog.fine("createBuffers(" + numBuffers + ", " + caps + ")");
        }
        // set the caps first, they're used when creating the bb
        backBufferCaps = caps;
        backBuffer = graphicsConfig.createBackBuffer(this, numBuffers, caps);
        xBackBuffer = graphicsConfig.createBackBufferImage(target,
                                                           backBuffer);
    }

    @Override
    public BufferCapabilities getBackBufferCaps() {
        return backBufferCaps;
    }

    public void flip(int x1, int y1, int x2, int y2,
                     BufferCapabilities.FlipContents flipAction)
    {
        if (buffersLog.isLoggable(PlatformLogger.Level.FINE)) {
            buffersLog.fine("flip(" + flipAction + ")");
        }
        if (backBuffer == 0) {
            throw new IllegalStateException("Buffers have not been created");
        }
        graphicsConfig.flip(this, target, xBackBuffer,
                            x1, y1, x2, y2, flipAction);
    }

    public Image getBackBuffer() {
        if (buffersLog.isLoggable(PlatformLogger.Level.FINE)) {
            buffersLog.fine("getBackBuffer()");
        }
        if (backBuffer == 0) {
            throw new IllegalStateException("Buffers have not been created");
        }
        return xBackBuffer;
    }

    public void destroyBuffers() {
        if (buffersLog.isLoggable(PlatformLogger.Level.FINE)) {
            buffersLog.fine("destroyBuffers()");
        }
        graphicsConfig.destroyBackBuffer(backBuffer);
        backBuffer = 0;
        xBackBuffer = null;
    }

    // End of multi-buffering

    public void notifyTextComponentChange(boolean add){
        Container parent = AWTAccessor.getComponentAccessor().getParent(target);
        while(!(parent == null ||
                parent instanceof java.awt.Frame ||
                parent instanceof java.awt.Dialog)) {
            parent = AWTAccessor.getComponentAccessor().getParent(parent);
        }

/*      FIX ME - FIX ME need to implement InputMethods
    if (parent instanceof java.awt.Frame ||
        parent instanceof java.awt.Dialog) {
        if (add)
        ((MInputMethodControl)parent.getPeer()).addTextComponent((MComponentPeer)this);
        else
        ((MInputMethodControl)parent.getPeer()).removeTextComponent((MComponentPeer)this);
    }
*/
    }

    /**
     * Returns true if this event is disabled and shouldn't be processed by window
     * Currently if target component is disabled the following event will be disabled on window:
     * ButtonPress, ButtonRelease, KeyPress, KeyRelease, EnterNotify, LeaveNotify, MotionNotify
     */
    protected boolean isEventDisabled(XEvent e) {
        if (enableLog.isLoggable(PlatformLogger.Level.FINEST)) {
            enableLog.finest("Component is {1}, checking for disabled event {0}", e, (isEnabled()?"enabled":"disable"));
        }
        if (!isEnabled()) {
            switch (e.get_type()) {
              case XConstants.ButtonPress:
              case XConstants.ButtonRelease:
              case XConstants.KeyPress:
              case XConstants.KeyRelease:
              case XConstants.EnterNotify:
              case XConstants.LeaveNotify:
              case XConstants.MotionNotify:
                  if (enableLog.isLoggable(PlatformLogger.Level.FINER)) {
                      enableLog.finer("Event {0} is disable", e);
                  }
                  return true;
            }
        }
        switch(e.get_type()) {
          case XConstants.MapNotify:
          case XConstants.UnmapNotify:
              return true;
        }
        return super.isEventDisabled(e);
    }

    Color getPeerBackground() {
        return background;
    }

    Color getPeerForeground() {
        return foreground;
    }

    Font getPeerFont() {
        return font;
    }

    Dimension getPeerSize() {
        return new Dimension(width,height);
    }

    public void setBoundsOperation(int operation) {
        synchronized(getStateLock()) {
            if (boundsOperation == DEFAULT_OPERATION) {
                boundsOperation = operation;
            } else if (operation == RESET_OPERATION) {
                boundsOperation = DEFAULT_OPERATION;
            }
        }
    }

    static String operationToString(int operation) {
        switch (operation) {
          case SET_LOCATION:
              return "SET_LOCATION";
          case SET_SIZE:
              return "SET_SIZE";
          case SET_CLIENT_SIZE:
              return "SET_CLIENT_SIZE";
          default:
          case SET_BOUNDS:
              return "SET_BOUNDS";
        }
    }

    /**
     * Lowers this component at the bottom of the above HW peer. If the above parameter
     * is null then the method places this component at the top of the Z-order.
     */
    public void setZOrder(ComponentPeer above) {
        long aboveWindow = (above != null) ? ((XComponentPeer)above).getWindow() : 0;

        XToolkit.awtLock();
        try{
            XlibWrapper.SetZOrder(XToolkit.getDisplay(), getWindow(), aboveWindow);
        }finally{
            XToolkit.awtUnlock();
        }
    }

    private void addTree(Collection order, Set set, Container cont) {
        for (int i = 0; i < cont.getComponentCount(); i++) {
            Component comp = cont.getComponent(i);
            ComponentPeer peer = comp.getPeer();
            if (peer instanceof XComponentPeer) {
                Long window = Long.valueOf(((XComponentPeer)peer).getWindow());
                if (!set.contains(window)) {
                    set.add(window);
                    order.add(window);
                }
            } else if (comp instanceof Container) {
                // It is lightweight container, it might contain heavyweight components attached to this
                // peer
                addTree(order, set, (Container)comp);
            }
        }
    }

    /****** DropTargetPeer implementation ********************/

    public void addDropTarget(DropTarget dt) {
        Component comp = target;
        while(!(comp == null || comp instanceof Window)) {
            comp = comp.getParent();
        }

        if (comp instanceof Window) {
            XWindowPeer wpeer = (XWindowPeer)(comp.getPeer());
            if (wpeer != null) {
                wpeer.addDropTarget();
            }
        }
    }

    public void removeDropTarget(DropTarget dt) {
        Component comp = target;
        while(!(comp == null || comp instanceof Window)) {
            comp = comp.getParent();
        }

        if (comp instanceof Window) {
            XWindowPeer wpeer = (XWindowPeer)(comp.getPeer());
            if (wpeer != null) {
                wpeer.removeDropTarget();
            }
        }
    }

    /**
     * Applies the shape to the X-window.
     * @since 1.7
     */
    public void applyShape(Region shape) {
        if (XlibUtil.isShapingSupported()) {
            if (shapeLog.isLoggable(PlatformLogger.Level.FINER)) {
                shapeLog.finer(
                        "*** INFO: Setting shape: PEER: " + this
                        + "; WINDOW: " + getWindow()
                        + "; TARGET: " + target
                        + "; SHAPE: " + shape);
            }
            XToolkit.awtLock();
            try {
                if (shape != null) {
                    XlibWrapper.SetRectangularShape(
                            XToolkit.getDisplay(),
                            getWindow(),
                            shape.getLoX(), shape.getLoY(),
                            shape.getHiX(), shape.getHiY(),
                            (shape.isRectangular() ? null : shape)
                            );
                } else {
                    XlibWrapper.SetRectangularShape(
                            XToolkit.getDisplay(),
                            getWindow(),
                            0, 0,
                            0, 0,
                            null
                            );
                }
            } finally {
                XToolkit.awtUnlock();
            }
        } else {
            if (shapeLog.isLoggable(PlatformLogger.Level.FINER)) {
                shapeLog.finer("*** WARNING: Shaping is NOT supported!");
            }
        }
    }

    public boolean updateGraphicsData(GraphicsConfiguration gc) {
        int oldVisual = -1, newVisual = -1;

        if (graphicsConfig != null) {
            oldVisual = graphicsConfig.getVisual();
        }
        if (gc != null && gc instanceof X11GraphicsConfig) {
            newVisual = ((X11GraphicsConfig)gc).getVisual();
        }

        // If the new visual differs from the old one, the peer must be
        // recreated because X11 does not allow changing the visual on the fly.
        // So we even skip the initGraphicsConfiguration() call.
        // The initial assignment should happen though, hence the != -1 thing.
        if (oldVisual != -1 && oldVisual != newVisual) {
            return true;
        }

        initGraphicsConfiguration();
        doValidateSurface();
        return false;
    }
}