Source Code Cross Referenced for DesignerPaneDropTarget.java in  » IDE-Netbeans » visualweb.api.designer » org » netbeans » modules » visualweb » designer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » visualweb.api.designer » org.netbeans.modules.visualweb.designer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         *
026:         * The Original Software is NetBeans. The Initial Developer of the Original
027:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028:         * Microsystems, Inc. All Rights Reserved.
029:         *
030:         * If you wish your version of this file to be governed by only the CDDL
031:         * or only the GPL Version 2, indicate your decision by adding
032:         * "[Contributor] elects to include this software in this distribution
033:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
034:         * single choice of license, a recipient has the option to distribute
035:         * your version of this file under either the CDDL, the GPL Version 2 or
036:         * to extend the choice of license to its licensees as provided above.
037:         * However, if you add GPL Version 2 code and therefore, elected the GPL
038:         * Version 2 license, then the option applies only if the new code is
039:         * made subject to such option by the copyright holder.
040:         */
041:
042:        package org.netbeans.modules.visualweb.designer;
043:
044:        import java.awt.datatransfer.DataFlavor;
045:        import java.awt.datatransfer.Transferable;
046:        import java.awt.dnd.DnDConstants;
047:        import java.awt.dnd.DropTarget;
048:        import java.awt.dnd.DropTargetDragEvent;
049:        import java.awt.dnd.DropTargetDropEvent;
050:        import java.awt.dnd.DropTargetEvent;
051:        import java.awt.dnd.DropTargetListener;
052:        import java.util.TooManyListenersException;
053:        import javax.swing.JComponent;
054:        import javax.swing.TransferHandler;
055:        import javax.swing.event.EventListenerList;
056:
057:        /**
058:         * XXX #101880 In order to avoid rescheduling the drop. The default Swing impl, first
059:         * processes the default listener (which handles the TransferHandler), and only
060:         * after notifies the other listeners, which causes an issue when doing drop.
061:         * We first need to notify the other listeners in order to provide the update
062:         * of the drop position.
063:         * 
064:         * XXX Be aware that in the other listeners one can't call accept/rejectDrag(Drop) otherwise it will breaks.
065:         * 
066:         *
067:         * @author Peter Zavadsky
068:         */
069:        public class DesignerPaneDropTarget extends DropTarget {
070:
071:            private static final DropTargetListener DEFAULT_TRANSFER_HANDLER_DROP_TARGET_LISTENER = new DefaultTransferHandlerDropTargetListener();
072:
073:            /** Hold the 'secondary' listeners. */
074:            private EventListenerList listenerList;
075:
076:            public DesignerPaneDropTarget(DesignerPane designerPane) {
077:                super ();
078:                setComponent(designerPane);
079:                try {
080:                    super 
081:                            .addDropTargetListener(DEFAULT_TRANSFER_HANDLER_DROP_TARGET_LISTENER);
082:                } catch (TooManyListenersException tmle) {
083:                    // No op.
084:                }
085:            }
086:
087:            public void addDropTargetListener(DropTargetListener dtl)
088:                    throws TooManyListenersException {
089:                // Since the super class only supports one DropTargetListener,
090:                // and we add one from the constructor, we always add to the
091:                // extended list.
092:                if (listenerList == null) {
093:                    listenerList = new EventListenerList();
094:                }
095:                listenerList.add(DropTargetListener.class, dtl);
096:            }
097:
098:            public void removeDropTargetListener(DropTargetListener dtl) {
099:                if (listenerList != null) {
100:                    listenerList.remove(DropTargetListener.class, dtl);
101:                }
102:            }
103:
104:            // --- DropTargetListener methods (multicast) --------------------------
105:
106:            public void dragEnter(DropTargetDragEvent e) {
107:                super .dragEnter(e);
108:                if (listenerList != null) {
109:                    Object[] listeners = listenerList.getListenerList();
110:                    for (int i = listeners.length - 2; i >= 0; i -= 2) {
111:                        if (listeners[i] == DropTargetListener.class) {
112:                            ((DropTargetListener) listeners[i + 1])
113:                                    .dragEnter(e);
114:                        }
115:                    }
116:                }
117:            }
118:
119:            public void dragOver(DropTargetDragEvent e) {
120:                super .dragOver(e);
121:                if (listenerList != null) {
122:                    Object[] listeners = listenerList.getListenerList();
123:                    for (int i = listeners.length - 2; i >= 0; i -= 2) {
124:                        if (listeners[i] == DropTargetListener.class) {
125:                            ((DropTargetListener) listeners[i + 1]).dragOver(e);
126:                        }
127:                    }
128:                }
129:            }
130:
131:            public void dragExit(DropTargetEvent e) {
132:                super .dragExit(e);
133:                if (listenerList != null) {
134:                    Object[] listeners = listenerList.getListenerList();
135:                    for (int i = listeners.length - 2; i >= 0; i -= 2) {
136:                        if (listeners[i] == DropTargetListener.class) {
137:                            ((DropTargetListener) listeners[i + 1]).dragExit(e);
138:                        }
139:                    }
140:                }
141:            }
142:
143:            public void drop(DropTargetDropEvent e) {
144:                //        super.drop(e);
145:                if (listenerList != null) {
146:                    Object[] listeners = listenerList.getListenerList();
147:                    for (int i = listeners.length - 2; i >= 0; i -= 2) {
148:                        if (listeners[i] == DropTargetListener.class) {
149:                            ((DropTargetListener) listeners[i + 1]).drop(e);
150:                        }
151:                    }
152:                }
153:                // XXX The default is proceeded after the other has a chance to update the position.
154:                super .drop(e);
155:            }
156:
157:            public void dropActionChanged(DropTargetDragEvent e) {
158:                super .dropActionChanged(e);
159:                if (listenerList != null) {
160:                    Object[] listeners = listenerList.getListenerList();
161:                    for (int i = listeners.length - 2; i >= 0; i -= 2) {
162:                        if (listeners[i] == DropTargetListener.class) {
163:                            ((DropTargetListener) listeners[i + 1])
164:                                    .dropActionChanged(e);
165:                        }
166:                    }
167:                }
168:            }
169:
170:            // XXX Copied from TransferHandler.DropHandler
171:            // XXX Does it need to be Serializable?
172:            private static class DefaultTransferHandlerDropTargetListener
173:                    implements  DropTargetListener /*, Serializable*/{
174:
175:                private boolean canImport;
176:
177:                private boolean actionSupported(int action) {
178:                    //            return (action & (COPY_OR_MOVE | LINK)) != NONE;
179:                    return (action & (DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_LINK)) != DnDConstants.ACTION_NONE;
180:                }
181:
182:                // --- DropTargetListener methods -----------------------------------
183:
184:                public void dragEnter(DropTargetDragEvent e) {
185:                    DataFlavor[] flavors = e.getCurrentDataFlavors();
186:
187:                    JComponent c = (JComponent) e.getDropTargetContext()
188:                            .getComponent();
189:                    TransferHandler importer = c.getTransferHandler();
190:
191:                    //            if (importer != null && importer.canImport(c, flavors)) {
192:                    // XXX #99457 Internally enhanced TransferHandler to use also Transferable to compare.
193:                    boolean canImporterImport;
194:                    if (importer instanceof  DesignerTransferHandler) {
195:                        canImporterImport = ((DesignerTransferHandler) importer)
196:                                .canImport(c, flavors, e.getTransferable());
197:                    } else {
198:                        canImporterImport = importer == null ? false : importer
199:                                .canImport(c, flavors);
200:                    }
201:                    if (canImporterImport) {
202:                        canImport = true;
203:                    } else {
204:                        canImport = false;
205:                    }
206:
207:                    int dropAction = e.getDropAction();
208:
209:                    if (canImport && actionSupported(dropAction)) {
210:                        e.acceptDrag(dropAction);
211:                    } else {
212:                        e.rejectDrag();
213:                    }
214:                }
215:
216:                public void dragOver(DropTargetDragEvent e) {
217:                    int dropAction = e.getDropAction();
218:
219:                    if (canImport && actionSupported(dropAction)) {
220:                        e.acceptDrag(dropAction);
221:                    } else {
222:                        e.rejectDrag();
223:                    }
224:                }
225:
226:                public void dragExit(DropTargetEvent e) {
227:                }
228:
229:                public void drop(DropTargetDropEvent e) {
230:                    int dropAction = e.getDropAction();
231:
232:                    JComponent c = (JComponent) e.getDropTargetContext()
233:                            .getComponent();
234:                    TransferHandler importer = c.getTransferHandler();
235:
236:                    if (canImport && importer != null
237:                            && actionSupported(dropAction)) {
238:                        e.acceptDrop(dropAction);
239:
240:                        try {
241:                            Transferable t = e.getTransferable();
242:                            e.dropComplete(importer.importData(c, t));
243:                        } catch (RuntimeException re) {
244:                            e.dropComplete(false);
245:                        }
246:                    } else {
247:                        e.rejectDrop();
248:                    }
249:                }
250:
251:                public void dropActionChanged(DropTargetDragEvent e) {
252:                    int dropAction = e.getDropAction();
253:
254:                    if (canImport && actionSupported(dropAction)) {
255:                        e.acceptDrag(dropAction);
256:                    } else {
257:                        e.rejectDrag();
258:                    }
259:                }
260:            }
261:        }
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