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/*
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* Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* This code is ported to XAWT from MAWT based on awt_mgrsel.c
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* code written originally by Valeriy Ushakov
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* Author : Bino George
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*/
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package sun.awt.X11;
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import java.util.*;
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import java.util.logging.*;
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public class XMSelection {
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/*
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* A method for a subsytem to express its interest in a certain
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* manager selection.
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*
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* If owner changes, the ownerChanged of the XMSelectionListener
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* will be called with the screen
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* number and the new owning window when onwership is established, or
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* None if the owner is gone.
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*
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* Events in extra_mask are selected for on owning windows (exsiting
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* ones and on new owners when established) and otherEvent of the
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* XMWSelectionListener will be called with the screen number and an event.
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*
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* The function returns an array of current owners. The size of the
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* array is ScreenCount(awt_display). The array is "owned" by this
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* module and should be considered by the caller as read-only.
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*/
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private static Logger log = Logger.getLogger("sun.awt.X11.XMSelection");
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/* Name of the selection */
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String selectionName;
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/* list of listeners to be called for events */
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Vector listeners;
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/* X atom array (one per screen) for this selection */
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XAtom atoms[];
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/* Window ids of selection owners */
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long owners[];
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/* event mask to set */
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long eventMask;
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static int numScreens;
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static XAtom XA_MANAGER;
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static HashMap selectionMap;
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static {
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long display = XToolkit.getDisplay();
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XToolkit.awtLock();
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try {
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numScreens = XlibWrapper.ScreenCount(display);
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} finally {
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XToolkit.awtUnlock();
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}
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XA_MANAGER = XAtom.get("MANAGER");
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for (int screen = 0; screen < numScreens ; screen ++) {
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initScreen(display,screen);
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}
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selectionMap = new HashMap();
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}
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static void initScreen(long display, final int screen) {
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XToolkit.awtLock();
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try {
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long root = XlibWrapper.RootWindow(display,screen);
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XlibWrapper.XSelectInput(display, root, XlibWrapper.StructureNotifyMask);
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XToolkit.addEventDispatcher(root,
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new XEventDispatcher() {
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public void dispatchEvent(XEvent ev) {
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processRootEvent(ev, screen);
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}
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});
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} finally {
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XToolkit.awtUnlock();
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}
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}
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public int getNumberOfScreens() {
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return numScreens;
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}
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void select(long extra_mask) {
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eventMask = extra_mask;
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for (int screen = 0; screen < numScreens ; screen ++) {
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selectPerScreen(screen,extra_mask);
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}
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}
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void resetOwner(long owner, final int screen) {
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XToolkit.awtLock();
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try {
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long display = XToolkit.getDisplay();
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synchronized(this) {
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setOwner(owner, screen);
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if (log.isLoggable(Level.FINE)) log.fine("New Selection Owner for screen " + screen + " = " + owner );
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XlibWrapper.XSelectInput(display, owner, XlibWrapper.StructureNotifyMask | eventMask);
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XToolkit.addEventDispatcher(owner,
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new XEventDispatcher() {
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public void dispatchEvent(XEvent ev) {
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dispatchSelectionEvent(ev, screen);
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}
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});
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}
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} finally {
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XToolkit.awtUnlock();
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}
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}
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void selectPerScreen(final int screen, long extra_mask) {
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XToolkit.awtLock();
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try {
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try {
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long display = XToolkit.getDisplay();
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if (log.isLoggable(Level.FINE)) log.fine("Grabbing XServer");
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XlibWrapper.XGrabServer(display);
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synchronized(this) {
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String selection_name = getName()+"_S"+screen;
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if (log.isLoggable(Level.FINE)) log.fine("Screen = " + screen + " selection name = " + selection_name);
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XAtom atom = XAtom.get(selection_name);
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selectionMap.put(Long.valueOf(atom.getAtom()),this); // add mapping from atom to the instance of XMSelection
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setAtom(atom,screen);
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long owner = XlibWrapper.XGetSelectionOwner(display, atom.getAtom());
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if (owner != 0) {
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setOwner(owner, screen);
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if (log.isLoggable(Level.FINE)) log.fine("Selection Owner for screen " + screen + " = " + owner );
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XlibWrapper.XSelectInput(display, owner, XlibWrapper.StructureNotifyMask | extra_mask);
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XToolkit.addEventDispatcher(owner,
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new XEventDispatcher() {
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public void dispatchEvent(XEvent ev) {
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dispatchSelectionEvent(ev, screen);
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}
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});
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}
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}
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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finally {
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if (log.isLoggable(Level.FINE)) log.fine("UnGrabbing XServer");
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XlibWrapper.XUngrabServer(XToolkit.getDisplay());
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}
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} finally {
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XToolkit.awtUnlock();
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}
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}
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static boolean processClientMessage(XEvent xev, int screen) {
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XClientMessageEvent xce = xev.get_xclient();
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if (xce.get_message_type() == XA_MANAGER.getAtom()) {
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if (log.isLoggable(Level.FINE)) log.fine("client messags = " + xce);
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long timestamp = xce.get_data(0);
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long atom = xce.get_data(1);
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long owner = xce.get_data(2);
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long data = xce.get_data(3);
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XMSelection sel = getInstance(atom);
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if (sel != null) {
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sel.resetOwner(owner,screen);
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sel.dispatchOwnerChangedEvent(xev,screen,owner,data, timestamp);
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}
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}
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return false;
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}
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static boolean processRootEvent(XEvent xev, int screen) {
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switch (xev.get_type()) {
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case XlibWrapper.ClientMessage: {
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return processClientMessage(xev, screen);
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}
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}
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return false;
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}
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static XMSelection getInstance(long selection) {
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return (XMSelection) selectionMap.get(Long.valueOf(selection));
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}
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/*
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* Default constructor specifies PropertyChangeMask as well
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*/
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public XMSelection (String selname) {
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this(selname, XlibWrapper.PropertyChangeMask);
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}
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/*
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* Some users may not need to know about selection changes,
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* just owner ship changes, They would specify a zero extra mask.
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*/
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public XMSelection (String selname, long extraMask) {
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synchronized (this) {
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selectionName = selname;
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atoms = new XAtom[getNumberOfScreens()];
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owners = new long[getNumberOfScreens()];
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}
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select(extraMask);
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}
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public synchronized void addSelectionListener(XMSelectionListener listener) {
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if (listeners == null) {
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listeners = new Vector();
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}
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listeners.add(listener);
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}
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public synchronized void removeSelectionListener(XMSelectionListener listener) {
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if (listeners != null) {
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listeners.remove(listener);
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}
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}
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synchronized Collection getListeners() {
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return listeners;
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}
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synchronized XAtom getAtom(int screen) {
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if (atoms != null) {
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return atoms[screen];
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}
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return null;
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}
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synchronized void setAtom(XAtom a, int screen) {
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if (atoms != null) {
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atoms[screen] = a;
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}
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}
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synchronized long getOwner(int screen) {
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if (owners != null) {
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return owners[screen];
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}
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return 0;
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}
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synchronized void setOwner(long owner, int screen) {
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if (owners != null) {
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owners[screen] = owner;
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}
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}
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synchronized String getName() {
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return selectionName;
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}
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synchronized void dispatchSelectionChanged( XPropertyEvent ev, int screen) {
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if (log.isLoggable(Level.FINE)) log.fine("Selection Changed : Screen = " + screen + "Event =" + ev);
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if (listeners != null) {
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Iterator iter = listeners.iterator();
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while (iter.hasNext()) {
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XMSelectionListener disp = (XMSelectionListener) iter.next();
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disp.selectionChanged(screen, this, ev.get_window(), ev);
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}
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}
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}
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synchronized void dispatchOwnerDeath(XDestroyWindowEvent de, int screen) {
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if (log.isLoggable(Level.FINE)) log.fine("Owner dead : Screen = " + screen + "Event =" + de);
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if (listeners != null) {
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Iterator iter = listeners.iterator();
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while (iter.hasNext()) {
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XMSelectionListener disp = (XMSelectionListener) iter.next();
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disp.ownerDeath(screen, this, de.get_window());
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}
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}
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}
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void dispatchSelectionEvent(XEvent xev, int screen) {
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if (log.isLoggable(Level.FINE)) log.fine("Event =" + xev);
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if (xev.get_type() == XlibWrapper.DestroyNotify) {
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XDestroyWindowEvent de = xev.get_xdestroywindow();
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dispatchOwnerDeath( de, screen);
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}
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else if (xev.get_type() == XlibWrapper.PropertyNotify) {
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XPropertyEvent xpe = xev.get_xproperty();
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dispatchSelectionChanged( xpe, screen);
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}
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}
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synchronized void dispatchOwnerChangedEvent(XEvent ev, int screen, long owner, long data, long timestamp) {
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if (listeners != null) {
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Iterator iter = listeners.iterator();
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while (iter.hasNext()) {
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XMSelectionListener disp = (XMSelectionListener) iter.next();
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disp.ownerChanged(screen,this, owner, data, timestamp);
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}
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}
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}
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}
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