/*
 * Copyright (c) 2003, 2008, 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.util.Iterator;

This class is a registry for the supported drag and drop protocols.
Since:1.5
/** * This class is a registry for the supported drag and drop protocols. * * @since 1.5 */
final class XDropTargetEventProcessor { private static final XDropTargetEventProcessor theInstance = new XDropTargetEventProcessor(); private static boolean active = false; // The current drop protocol. private XDropTargetProtocol protocol = null; private XDropTargetEventProcessor() {} private boolean doProcessEvent(XEvent ev) { if (ev.get_type() == (int)XConstants.DestroyNotify && protocol != null && ev.get_xany().get_window() == protocol.getSourceWindow()) { protocol.cleanup(); protocol = null; return false; } if (ev.get_type() == (int)XConstants.PropertyNotify) { XPropertyEvent xproperty = ev.get_xproperty(); if (xproperty.get_atom() == MotifDnDConstants.XA_MOTIF_DRAG_RECEIVER_INFO.getAtom()) { XDropTargetRegistry.getRegistry().updateEmbedderDropSite(xproperty.get_window()); } } if (ev.get_type() != (int)XConstants.ClientMessage) { return false; } boolean processed = false; XClientMessageEvent xclient = ev.get_xclient(); XDropTargetProtocol curProtocol = protocol; if (protocol != null) { if (protocol.getMessageType(xclient) != XDropTargetProtocol.UNKNOWN_MESSAGE) { processed = protocol.processClientMessage(xclient); } else { protocol = null; } } if (protocol == null) { Iterator dropTargetProtocols = XDragAndDropProtocols.getDropTargetProtocols(); while (dropTargetProtocols.hasNext()) { XDropTargetProtocol dropTargetProtocol = (XDropTargetProtocol)dropTargetProtocols.next(); // Don't try to process it again with the current protocol. if (dropTargetProtocol == curProtocol) { continue; } if (dropTargetProtocol.getMessageType(xclient) == XDropTargetProtocol.UNKNOWN_MESSAGE) { continue; } protocol = dropTargetProtocol; processed = protocol.processClientMessage(xclient); break; } } return processed; } static void reset() { theInstance.protocol = null; } static void activate() { active = true; } // Fix for 4915454 - do not call doProcessEvent() until the first drop // target is registered to avoid premature loading of DnD protocol // classes. static boolean processEvent(XEvent ev) { return active ? theInstance.doProcessEvent(ev) : false; } }