| /* |
| * 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 |
| */ |
| 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; |
| } |
| } |