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 1997-2006 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: package org.openide.explorer.view;
042:
043: import org.openide.nodes.Node;
044: import org.openide.util.WeakSet;
045:
046: import java.awt.Cursor;
047: import java.awt.datatransfer.Transferable;
048: import java.awt.dnd.DnDConstants; // TEMP
049:
050: import java.util.Iterator;
051:
052: import javax.swing.JScrollPane;
053:
054: /**
055: * Manager for explorer DnD.
056: *
057: *
058: * @author Jiri Rechtacek
059: *
060: * @see TreeViewDragSupport
061: * @see TreeViewDropSupport
062: */
063: final class ExplorerDnDManager {
064: /** Singleton instance of explorer dnd manager. */
065: private static ExplorerDnDManager defaultDnDManager;
066: private Node[] draggedNodes;
067: private Transferable draggedTransForCut;
068: private Transferable draggedTransForCopy;
069: private boolean isDnDActive = false;
070: private int nodeAllowed = 0;
071: private Cursor cursor = null;
072: private boolean maybeExternalDnD = false;
073:
074: /** Creates a new instance of <code>WindowsDnDManager</code>. */
075: private ExplorerDnDManager() {
076: }
077:
078: /** Gets the singleton instance of this window dnd manager. */
079: static synchronized ExplorerDnDManager getDefault() {
080: if (defaultDnDManager == null) {
081: defaultDnDManager = new ExplorerDnDManager();
082: }
083:
084: return defaultDnDManager;
085: }
086:
087: void setDraggedNodes(Node[] n) {
088: draggedNodes = n;
089: }
090:
091: Node[] getDraggedNodes() {
092: return draggedNodes;
093: }
094:
095: void setDraggedTransferable(Transferable trans, boolean isCut) {
096: if (isCut) {
097: draggedTransForCut = trans;
098: } else {
099: draggedTransForCopy = trans;
100: }
101: }
102:
103: Transferable getDraggedTransferable(boolean isCut) {
104: if (isCut) {
105: return draggedTransForCut;
106: }
107:
108: // only for copy
109: return draggedTransForCopy;
110: }
111:
112: void setNodeAllowedActions(int actions) {
113: nodeAllowed = actions;
114: }
115:
116: final int getNodeAllowedActions() {
117: if (!isDnDActive && maybeExternalDnD)
118: return DnDConstants.ACTION_COPY;
119:
120: return nodeAllowed;
121: }
122:
123: void setDnDActive(boolean state) {
124: isDnDActive = state;
125: }
126:
127: boolean isDnDActive() {
128: return isDnDActive || maybeExternalDnD;
129: }
130:
131: int getAdjustedDropAction(int action, int allowed) {
132: int possibleAction = action;
133:
134: if ((possibleAction & allowed) == 0) {
135: possibleAction = allowed;
136: }
137:
138: if ((possibleAction & getNodeAllowedActions()) == 0) {
139: possibleAction = getNodeAllowedActions();
140: }
141:
142: return possibleAction;
143: }
144:
145: void setMaybeExternalDragAndDrop(boolean maybeExternalDnD) {
146: this .maybeExternalDnD = maybeExternalDnD;
147: }
148:
149: void prepareCursor(Cursor c) {
150: this .cursor = c;
151: }
152:
153: Cursor getCursor() {
154: return this.cursor;
155: }
156: }
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