1 /*
2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.lwawt;
27
28 import javax.swing.*;
29 import javax.swing.event.*;
30 import java.awt.*;
31 import java.awt.event.*;
32 import java.awt.peer.ListPeer;
33 import java.util.Arrays;
34
35 /**
36 * Lightweight implementation of {@link ListPeer}.
37 */
38 final class LWListPeer extends LWComponentPeer<List, LWListPeer.ScrollableJList>
39 implements ListPeer {
40
41 /**
42 * The default number of visible rows.
43 */
44 private static final int DEFAULT_VISIBLE_ROWS = 4; // From java.awt.List,
45
46 /**
47 * This text is used for cell bounds calculation.
48 */
49 private static final String TEXT = "0123456789abcde";
50
51 LWListPeer(final List target, final PlatformComponent platformComponent) {
52 super(target, platformComponent);
53 if (!getTarget().isBackgroundSet()) {
54 getTarget().setBackground(SystemColor.text);
55 }
56 }
57
58 @Override
59 protected ScrollableJList createDelegate() {
60 return new ScrollableJList();
61 }
62
63 @Override
64 void initializeImpl() {
65 super.initializeImpl();
66 setMultipleMode(getTarget().isMultipleMode());
67 final int[] selectedIndices = getTarget().getSelectedIndexes();
68 synchronized (getDelegateLock()) {
69 getDelegate().setSkipStateChangedEvent(true);
70 getDelegate().getView().setSelectedIndices(selectedIndices);
71 getDelegate().setSkipStateChangedEvent(false);
72 }
73 }
74
75 @Override
76 public boolean isFocusable() {
77 return true;
78 }
79
80 @Override
81 protected Component getDelegateFocusOwner() {
82 return getDelegate().getView();
83 }
84
85 @Override
86 public int[] getSelectedIndexes() {
87 synchronized (getDelegateLock()) {
88 return getDelegate().getView().getSelectedIndices();
89 }
90 }
91
92 @Override
93 public void add(final String item, final int index) {
94 synchronized (getDelegateLock()) {
95 getDelegate().getModel().add(index, item);
96 revalidate();
97 }
98 }
99
100 @Override
101 public void delItems(final int start, final int end) {
102 synchronized (getDelegateLock()) {
103 getDelegate().getModel().removeRange(start, end);
104 revalidate();
105 }
106 }
107
108 @Override
109 public void removeAll() {
110 synchronized (getDelegateLock()) {
111 getDelegate().getModel().removeAllElements();
112 revalidate();
113 }
114 }
115
116 @Override
117 public void select(final int index) {
118 synchronized (getDelegateLock()) {
119 getDelegate().setSkipStateChangedEvent(true);
120 getDelegate().getView().setSelectedIndex(index);
121 getDelegate().setSkipStateChangedEvent(false);
122 }
123 }
124
125 @Override
126 public void deselect(final int index) {
127 synchronized (getDelegateLock()) {
128 getDelegate().getView().getSelectionModel().
129 removeSelectionInterval(index, index);
130 }
131 }
132
133 @Override
134 public void makeVisible(final int index) {
135 synchronized (getDelegateLock()) {
136 getDelegate().getView().ensureIndexIsVisible(index);
137 }
138 }
139
140 @Override
141 public void setMultipleMode(final boolean m) {
142 synchronized (getDelegateLock()) {
143 getDelegate().getView().setSelectionMode(m ?
144 ListSelectionModel.MULTIPLE_INTERVAL_SELECTION
145 : ListSelectionModel.SINGLE_SELECTION);
146 }
147 }
148
149 @Override
150 public Dimension getPreferredSize() {
151 return getMinimumSize();
152 }
153
154 @Override
155 public Dimension getMinimumSize() {
156 return getMinimumSize(DEFAULT_VISIBLE_ROWS);
157 }
158
159 @Override
160 public Dimension getPreferredSize(final int rows) {
161 return getMinimumSize(rows);
162 }
163
164 @Override
165 public Dimension getMinimumSize(final int rows) {
166 synchronized (getDelegateLock()) {
167 final Dimension size = getCellSize();
168 size.height *= rows;
169 // Always take vertical scrollbar into account.
170 final JScrollBar vbar = getDelegate().getVerticalScrollBar();
171 size.width += vbar != null ? vbar.getMinimumSize().width : 0;
172 // JScrollPane and JList insets
173 final Insets pi = getDelegate().getInsets();
174 final Insets vi = getDelegate().getView().getInsets();
175 size.width += pi.left + pi.right + vi.left + vi.right;
176 size.height += pi.top + pi.bottom + vi.top + vi.bottom;
177 return size;
178 }
179 }
180
181 private Dimension getCellSize() {
182 final JList<String> jList = getDelegate().getView();
183 final ListCellRenderer<? super String> cr = jList.getCellRenderer();
184 final Component cell = cr.getListCellRendererComponent(jList, TEXT, 0,
185 false, false);
186 return cell.getPreferredSize();
187 }
188
189 private void revalidate() {
190 synchronized (getDelegateLock()) {
191 getDelegate().getView().invalidate();
192 getDelegate().validate();
193 }
194 }
195
196 final class ScrollableJList extends JScrollPane implements ListSelectionListener {
197
198 private boolean skipStateChangedEvent;
199
200 private final DefaultListModel<String> model =
201 new DefaultListModel<String>() {
202 @Override
203 public void add(final int index, final String element) {
204 if (index == -1) {
205 addElement(element);
206 } else {
207 super.add(index, element);
208 }
209 }
210 };
211
212 private int[] oldSelectedIndices = new int[0];
213
214 ScrollableJList() {
215 getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
216 final JList<String> list = new JListDelegate();
217 list.addListSelectionListener(this);
218
219 getViewport().setView(list);
220
221 // Pull the items from the target.
222 final String[] items = getTarget().getItems();
223 for (int i = 0; i < items.length; i++) {
224 model.add(i, items[i]);
225 }
226 }
227
228 public boolean isSkipStateChangedEvent() {
229 return skipStateChangedEvent;
230 }
231
232 public void setSkipStateChangedEvent(boolean skipStateChangedEvent) {
233 this.skipStateChangedEvent = skipStateChangedEvent;
234 }
235
236 @Override
237 public void valueChanged(final ListSelectionEvent e) {
238 if (!e.getValueIsAdjusting() && !isSkipStateChangedEvent()) {
239 final JList source = (JList) e.getSource();
240 for(int i = 0 ; i < source.getModel().getSize(); i++) {
241
242 final boolean wasSelected = Arrays.binarySearch(oldSelectedIndices, i) >= 0;
243 final boolean isSelected = source.isSelectedIndex(i);
244
245 if (wasSelected == isSelected) {
246 continue;
247 }
248
249 final int state = !wasSelected && isSelected ? ItemEvent.SELECTED: ItemEvent.DESELECTED;
250
251 LWListPeer.this.postEvent(new ItemEvent(getTarget(), ItemEvent.ITEM_STATE_CHANGED,
252 i, state));
253 }
254 oldSelectedIndices = source.getSelectedIndices();
255 }
256 }
257
258 public JList<String> getView() {
259 return (JList<String>) getViewport().getView();
260 }
261
262 public DefaultListModel<String> getModel() {
263 return model;
264 }
265
266 @Override
267 public void setEnabled(final boolean enabled) {
268 getView().setEnabled(enabled);
269 super.setEnabled(enabled);
270 }
271
272 @Override
273 public void setOpaque(final boolean isOpaque) {
274 super.setOpaque(isOpaque);
275 if (getView() != null) {
276 getView().setOpaque(isOpaque);
277 }
278 }
279
280 @Override
281 public void setFont(Font font) {
282 super.setFont(font);
283 if (getView() != null) {
284 getView().setFont(font);
285 LWListPeer.this.revalidate();
286 }
287 }
288
289 private final class JListDelegate extends JList<String> {
290
291 JListDelegate() {
292 super(ScrollableJList.this.model);
293 }
294
295 @Override
296 public boolean hasFocus() {
297 return getTarget().hasFocus();
298 }
299
300 @Override
301 protected void processMouseEvent(final MouseEvent e) {
302 super.processMouseEvent(e);
303 if (e.getID() == MouseEvent.MOUSE_CLICKED && e.getClickCount() == 2) {
304 final int index = locationToIndex(e.getPoint());
305 if (0 <= index && index < getModel().getSize()) {
306 LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
307 getModel().getElementAt(index), e.getWhen(), e.getModifiers()));
308 }
309 }
310 }
311
312 @Override
313 protected void processKeyEvent(final KeyEvent e) {
314 super.processKeyEvent(e);
315 if (e.getID() == KeyEvent.KEY_PRESSED && e.getKeyCode() == KeyEvent.VK_ENTER) {
316 final String selectedValue = getSelectedValue();
317 if(selectedValue != null){
318 LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
319 selectedValue, e.getWhen(), e.getModifiers()));
320 }
321 }
322 }
323
324 //Needed for Autoscroller.
325 @Override
326 public Point getLocationOnScreen() {
327 return LWListPeer.this.getLocationOnScreen();
328 }
329 }
330 }
331 }