1 /*
2 * Copyright (c) 2011, 2013, 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}. Delegates most of the work to
37 * the {@link JList}, which is placed inside {@link JScrollPane}.
38 */
39 final class LWListPeer extends LWComponentPeer<List, LWListPeer.ScrollableJList>
40 implements ListPeer {
41
42 /**
43 * The default number of visible rows.
44 */
45 private static final int DEFAULT_VISIBLE_ROWS = 4; // From java.awt.List,
46
47 /**
48 * This text is used for cell bounds calculation.
49 */
50 private static final String TEXT = "0123456789abcde";
51
52 LWListPeer(final List target, final PlatformComponent platformComponent) {
53 super(target, platformComponent);
54 if (!getTarget().isBackgroundSet()) {
55 getTarget().setBackground(SystemColor.text);
56 }
57 }
58
59 @Override
60 ScrollableJList createDelegate() {
61 return new ScrollableJList();
62 }
63
64 @Override
65 void initializeImpl() {
66 super.initializeImpl();
67 setMultipleMode(getTarget().isMultipleMode());
68 final int[] selectedIndices = getTarget().getSelectedIndexes();
69 synchronized (getDelegateLock()) {
70 getDelegate().setSkipStateChangedEvent(true);
71 getDelegate().getView().setSelectedIndices(selectedIndices);
72 getDelegate().setSkipStateChangedEvent(false);
73 }
74 }
75
76 @Override
77 public boolean isFocusable() {
78 return true;
79 }
80
81 @Override
82 Component getDelegateFocusOwner() {
83 return getDelegate().getView();
84 }
85
86 @Override
87 public int[] getSelectedIndexes() {
88 synchronized (getDelegateLock()) {
89 return getDelegate().getView().getSelectedIndices();
90 }
91 }
92
93 @Override
94 public void add(final String item, final int index) {
95 synchronized (getDelegateLock()) {
96 getDelegate().getModel().add(index, item);
97 revalidate();
98 }
99 }
100
101 @Override
102 public void delItems(final int start, final int end) {
103 synchronized (getDelegateLock()) {
104 getDelegate().getModel().removeRange(start, end);
105 revalidate();
106 }
107 }
108
109 @Override
110 public void removeAll() {
111 synchronized (getDelegateLock()) {
112 getDelegate().getModel().removeAllElements();
113 revalidate();
114 }
115 }
116
117 @Override
118 public void select(final int index) {
119 synchronized (getDelegateLock()) {
120 getDelegate().setSkipStateChangedEvent(true);
121 getDelegate().getView().setSelectedIndex(index);
122 getDelegate().setSkipStateChangedEvent(false);
123 }
124 }
125
126 @Override
127 public void deselect(final int index) {
128 synchronized (getDelegateLock()) {
129 getDelegate().getView().getSelectionModel().
130 removeSelectionInterval(index, index);
131 }
132 }
133
134 @Override
135 public void makeVisible(final int index) {
136 synchronized (getDelegateLock()) {
137 getDelegate().getView().ensureIndexIsVisible(index);
138 }
139 }
140
141 @Override
142 public void setMultipleMode(final boolean m) {
143 synchronized (getDelegateLock()) {
144 getDelegate().getView().setSelectionMode(m ?
145 ListSelectionModel.MULTIPLE_INTERVAL_SELECTION
146 : ListSelectionModel.SINGLE_SELECTION);
147 }
148 }
149
150 @Override
151 public Dimension getPreferredSize() {
152 return getMinimumSize();
153 }
154
155 @Override
156 public Dimension getMinimumSize() {
157 return getMinimumSize(DEFAULT_VISIBLE_ROWS);
158 }
159
160 @Override
161 public Dimension getPreferredSize(final int rows) {
162 return getMinimumSize(rows);
163 }
164
165 @Override
166 public Dimension getMinimumSize(final int rows) {
167 synchronized (getDelegateLock()) {
168 final Dimension size = getCellSize();
169 size.height *= rows;
170 // Always take vertical scrollbar into account.
171 final JScrollBar vbar = getDelegate().getVerticalScrollBar();
172 size.width += vbar != null ? vbar.getMinimumSize().width : 0;
173 // JScrollPane and JList insets
174 final Insets pi = getDelegate().getInsets();
175 final Insets vi = getDelegate().getView().getInsets();
176 size.width += pi.left + pi.right + vi.left + vi.right;
177 size.height += pi.top + pi.bottom + vi.top + vi.bottom;
178 return size;
179 }
180 }
181
182 private Dimension getCellSize() {
183 final JList<String> jList = getDelegate().getView();
184 final ListCellRenderer<? super String> cr = jList.getCellRenderer();
185 final Component cell = cr.getListCellRendererComponent(jList, TEXT, 0,
186 false, false);
187 return cell.getPreferredSize();
188 }
189
190 private void revalidate() {
191 synchronized (getDelegateLock()) {
192 getDelegate().getView().invalidate();
193 getDelegate().validate();
194 }
195 }
196
197 @SuppressWarnings("serial")// Safe: outer class is non-serializable.
198 final class ScrollableJList extends JScrollPane implements ListSelectionListener {
199
200 private boolean skipStateChangedEvent;
201
202 private final DefaultListModel<String> model =
203 new DefaultListModel<String>() {
204 @Override
205 public void add(final int index, final String element) {
206 if (index == -1) {
207 addElement(element);
208 } else {
209 super.add(index, element);
210 }
211 }
212 };
213
214 private int[] oldSelectedIndices = new int[0];
215
216 ScrollableJList() {
217 getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
218 final JList<String> list = new JListDelegate();
219 list.addListSelectionListener(this);
220
221 getViewport().setView(list);
222
223 // Pull the items from the target.
224 final String[] items = getTarget().getItems();
225 for (int i = 0; i < items.length; i++) {
226 model.add(i, items[i]);
227 }
228 }
229
230 public boolean isSkipStateChangedEvent() {
231 return skipStateChangedEvent;
232 }
233
234 public void setSkipStateChangedEvent(boolean skipStateChangedEvent) {
235 this.skipStateChangedEvent = skipStateChangedEvent;
236 }
237
238 @Override
239 @SuppressWarnings("unchecked")
240 public void valueChanged(final ListSelectionEvent e) {
241 if (!e.getValueIsAdjusting() && !isSkipStateChangedEvent()) {
242 final JList<?> source = (JList<?>) e.getSource();
243 for(int i = 0 ; i < source.getModel().getSize(); i++) {
244
245 final boolean wasSelected = Arrays.binarySearch(oldSelectedIndices, i) >= 0;
246 final boolean isSelected = source.isSelectedIndex(i);
247
248 if (wasSelected == isSelected) {
249 continue;
250 }
251
252 final int state = !wasSelected && isSelected ? ItemEvent.SELECTED: ItemEvent.DESELECTED;
253
254 LWListPeer.this.postEvent(new ItemEvent(getTarget(), ItemEvent.ITEM_STATE_CHANGED,
255 i, state));
256 }
257 oldSelectedIndices = source.getSelectedIndices();
258 }
259 }
260
261 @SuppressWarnings("unchecked")
262 public JList<String> getView() {
263 return (JList<String>) getViewport().getView();
264 }
265
266 public DefaultListModel<String> getModel() {
267 return model;
268 }
269
270 @Override
271 public void setEnabled(final boolean enabled) {
272 getView().setEnabled(enabled);
273 super.setEnabled(enabled);
274 }
275
276 @Override
277 public void setOpaque(final boolean isOpaque) {
278 super.setOpaque(isOpaque);
279 if (getView() != null) {
280 getView().setOpaque(isOpaque);
281 }
282 }
283
284 @Override
285 public void setFont(Font font) {
286 super.setFont(font);
287 if (getView() != null) {
288 getView().setFont(font);
289 LWListPeer.this.revalidate();
290 }
291 }
292
293 private final class JListDelegate extends JList<String> {
294
295 JListDelegate() {
296 super(model);
297 }
298
299 @Override
300 public boolean hasFocus() {
301 return getTarget().hasFocus();
302 }
303
304 @Override
305 protected void processMouseEvent(final MouseEvent e) {
306 super.processMouseEvent(e);
307 if (e.getID() == MouseEvent.MOUSE_CLICKED && e.getClickCount() == 2) {
308 final int index = locationToIndex(e.getPoint());
309 if (0 <= index && index < getModel().getSize()) {
310 LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
311 getModel().getElementAt(index), e.getWhen(), e.getModifiers()));
312 }
313 }
314 }
315
316 @Override
317 protected void processKeyEvent(final KeyEvent e) {
318 super.processKeyEvent(e);
319 if (e.getID() == KeyEvent.KEY_PRESSED && e.getKeyCode() == KeyEvent.VK_ENTER) {
320 final String selectedValue = getSelectedValue();
321 if(selectedValue != null){
322 LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
323 selectedValue, e.getWhen(), e.getModifiers()));
324 }
325 }
326 }
327
328 //Needed for Autoscroller.
329 @Override
330 public Point getLocationOnScreen() {
331 return LWListPeer.this.getLocationOnScreen();
332 }
333 }
334 }
335 }