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1 package SnowMailClient.view.folders;
2
3 import java.util.*;
4 import java.io.*;
5 import java.awt.*;
6 import java.awt.event.*;
7 import java.awt.datatransfer.*;
8 import java.awt.dnd.*;
9 import javax.swing.*;
10
11
15 @SuppressWarnings  ("unchecked")
16 public final class ArrayListTransfertHandler extends TransferHandler {
17 private DataFlavor localArrayListFlavor, serialArrayListFlavor;
18 private String localArrayListType = DataFlavor.javaJVMLocalObjectMimeType +
19 ";class=java.util.ArrayList";
20 JList source = null;
21 int[] indices = null;
22 int addIndex = -1; int addCount = 0;
25 ArrayListTransfertHandler() {
26 try {
27 localArrayListFlavor = new DataFlavor(localArrayListType);
28 } catch (ClassNotFoundException e) {
29 System.out.println(
30 "ArrayListTransferHandler: unable to create data flavor");
31 }
32 serialArrayListFlavor = new DataFlavor(ArrayList.class,
33 "ArrayList");
34 }
35
36 public boolean importData(JComponent c, Transferable t) {
37 JList target = null;
38 ArrayList<Object > alist = null;
39 if (!canImport(c, t.getTransferDataFlavors())) {
40 return false;
41 }
42 try {
43 target = (JList)c;
44 if (hasLocalArrayListFlavor(t.getTransferDataFlavors())) {
45 alist = (ArrayList)t.getTransferData(localArrayListFlavor);
46 } else if (hasSerialArrayListFlavor(t.getTransferDataFlavors())) {
47 alist = (ArrayList)t.getTransferData(serialArrayListFlavor);
48 } else {
49 return false;
50 }
51 } catch (UnsupportedFlavorException ufe) {
52 System.out.println("importData: unsupported data flavor");
53 return false;
54 } catch (IOException ioe) {
55 System.out.println("importData: I/O exception");
56 return false;
57 }
58
59
62 int index = target.getSelectedIndex();
64
65 if (source.equals(target)) {
72 if (indices != null && index >= indices[0] - 1 &&
73 index <= indices[indices.length - 1]) {
74 indices = null;
75 return true;
76 }
77 }
78
79 DefaultListModel listModel = (DefaultListModel)target.getModel();
80 int max = listModel.getSize();
81 if (index < 0) {
82 index = max;
83 } else {
84 index++;
85 if (index > max) {
86 index = max;
87 }
88 }
89 addIndex = index;
90 addCount = alist.size();
91 for (int i=0; i < alist.size(); i++) {
92 listModel.add(index++, alist.get(i));
93 }
94 return true;
95 }
96
97 protected void exportDone(JComponent c, Transferable data, int action)
98 {
99 if ((action == MOVE) && (indices != null)) {
100 DefaultListModel model = (DefaultListModel)source.getModel();
101
102 if (addCount > 0) {
106 for (int i = 0; i < indices.length; i++) {
107 if (indices[i] > addIndex) {
108 indices[i] += addCount;
109 }
110 }
111 }
112 for (int i = indices.length -1; i >= 0; i--)
113 model.remove(indices[i]);
114 }
115 indices = null;
116 addIndex = -1;
117 addCount = 0;
118 }
119
120 private boolean hasLocalArrayListFlavor(DataFlavor[] flavors) {
121 if (localArrayListFlavor == null) {
122 return false;
123 }
124
125 for (int i = 0; i < flavors.length; i++) {
126 if (flavors[i].equals(localArrayListFlavor)) {
127 return true;
128 }
129 }
130 return false;
131 }
132
133 private boolean hasSerialArrayListFlavor(DataFlavor[] flavors) {
134 if (serialArrayListFlavor == null) {
135 return false;
136 }
137
138 for (int i = 0; i < flavors.length; i++) {
139 if (flavors[i].equals(serialArrayListFlavor)) {
140 return true;
141 }
142 }
143 return false;
144 }
145
146 public boolean canImport(JComponent c, DataFlavor[] flavors) {
147 if (hasLocalArrayListFlavor(flavors)) { return true; }
148 if (hasSerialArrayListFlavor(flavors)) { return true; }
149 return false;
150 }
151
152 protected Transferable createTransferable(JComponent c) {
153 if (c instanceof JList) {
154 source = (JList)c;
155 indices = source.getSelectedIndices();
156 Object [] values = source.getSelectedValues();
157 if (values == null || values.length == 0) {
158 return null;
159 }
160 ArrayList alist = new ArrayList(values.length);
161 for (int i = 0; i < values.length; i++) {
162 Object o = values[i];
163 String str = o.toString();
164 if (str == null) str = "";
165 alist.add(str);
166 }
167 return new ArrayListTransferable(alist);
168 }
169 return null;
170 }
171
172 public int getSourceActions(JComponent c) {
173 return COPY_OR_MOVE;
174 }
175
176 public class ArrayListTransferable implements Transferable {
177 ArrayList<Object > data;
178
179 public ArrayListTransferable(ArrayList<Object > alist) {
180 data = alist;
181 }
182
183 public Object getTransferData(DataFlavor flavor)
184 throws UnsupportedFlavorException {
185 if (!isDataFlavorSupported(flavor)) {
186 throw new UnsupportedFlavorException(flavor);
187 }
188 return data;
189 }
190
191 public DataFlavor[] getTransferDataFlavors() {
192 return new DataFlavor[] { localArrayListFlavor,
193 serialArrayListFlavor };
194 }
195
196 public boolean isDataFlavorSupported(DataFlavor flavor) {
197 if (localArrayListFlavor.equals(flavor)) {
198 return true;
199 }
200 if (serialArrayListFlavor.equals(flavor)) {
201 return true;
202 }
203 return false;
204 }
205 }
206 } |
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