1 /*
2 * Copyright (c) 2011, 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 final class LWListPeer
36 extends LWComponentPeer<List, LWListPeer.ScrollableJList>
37 implements ListPeer {
38
39 LWListPeer(final List target, final PlatformComponent platformComponent) {
40 super(target, platformComponent);
41 if (!getTarget().isBackgroundSet()) {
42 getTarget().setBackground(SystemColor.text);
43 }
44 }
45
46 @Override
47 protected ScrollableJList createDelegate() {
48 return new ScrollableJList();
49 }
50
51 @Override
52 public void initialize() {
53 super.initialize();
54 setMultipleMode(getTarget().isMultipleMode());
55 final int[] selectedIndices = getTarget().getSelectedIndexes();
56 synchronized (getDelegateLock()) {
57 getDelegate().setSkipStateChangedEvent(true);
58 getDelegate().getView().setSelectedIndices(selectedIndices);
59 getDelegate().setSkipStateChangedEvent(false);
60 }
61 }
62
63 @Override
64 public boolean isFocusable() {
65 return true;
66 }
67
68 @Override
69 protected Component getDelegateFocusOwner() {
70 return getDelegate().getView();
71 }
72
73 @Override
74 public int[] getSelectedIndexes() {
75 synchronized (getDelegateLock()) {
76 return getDelegate().getView().getSelectedIndices();
77 }
78 }
79
80 @Override
81 public void add(final String item, final int index) {
82 synchronized (getDelegateLock()) {
83 getDelegate().getModel().add(index, item);
84 revalidate();
85 }
86 }
87
88 @Override
89 public void delItems(final int start, final int end) {
90 synchronized (getDelegateLock()) {
91 getDelegate().getModel().removeRange(start, end);
92 revalidate();
93 }
94 }
95
96 @Override
97 public void removeAll() {
98 synchronized (getDelegateLock()) {
99 getDelegate().getModel().removeAllElements();
100 revalidate();
101 }
102 }
103
104 @Override
105 public void select(final int index) {
106 synchronized (getDelegateLock()) {
107 getDelegate().setSkipStateChangedEvent(true);
108 getDelegate().getView().setSelectedIndex(index);
109 getDelegate().setSkipStateChangedEvent(false);
110 }
111 }
112
113 @Override
114 public void deselect(final int index) {
115 synchronized (getDelegateLock()) {
116 getDelegate().getView().getSelectionModel().
117 removeSelectionInterval(index, index);
118 }
119 }
120
121 @Override
122 public void makeVisible(final int index) {
123 synchronized (getDelegateLock()) {
124 getDelegate().getView().ensureIndexIsVisible(index);
125 }
126 }
127
128 @Override
129 public void setMultipleMode(final boolean m) {
130 synchronized (getDelegateLock()) {
131 getDelegate().getView().setSelectionMode(m ?
132 ListSelectionModel.MULTIPLE_INTERVAL_SELECTION
133 : ListSelectionModel.SINGLE_SELECTION);
134 }
135 }
136
137 @Override
138 public Dimension getPreferredSize(final int rows) {
139 return getMinimumSize(rows);
140 }
141
142 @Override
143 public Dimension getMinimumSize(final int rows) {
144 synchronized (getDelegateLock()) {
145 final int margin = 2;
146 final int space = 1;
147
148 // TODO: count ScrollPane's scrolling elements if any.
149 final FontMetrics fm = getFontMetrics(getFont());
150 final int itemHeight = (fm.getHeight() - fm.getLeading()) + (2 * space);
151
152 return new Dimension(20 + (fm == null ? 10 * 15 : fm.stringWidth("0123456789abcde")),
153 (fm == null ? 10 : itemHeight) * rows + (2 * margin));
154 }
155 }
156
157 private void revalidate() {
158 synchronized (getDelegateLock()) {
159 getDelegate().getView().invalidate();
160 getDelegate().validate();
161 }
162 }
163
164 final class ScrollableJList extends JScrollPane implements ListSelectionListener {
165
166 private boolean skipStateChangedEvent;
167
168 private DefaultListModel<Object> model =
169 new DefaultListModel<Object>() {
170 @Override
171 public void add(final int index, final Object element) {
172 if (index == -1) {
173 addElement(element);
174 } else {
175 super.add(index, element);
176 }
177 }
178 };
179
180 private int[] oldSelectedIndices = new int[0];
181
182 ScrollableJList() {
183 getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
184 final JList<Object> list = new JListDelegate();
185 list.addListSelectionListener(this);
186
187 getViewport().setView(list);
188
189 // Pull the items from the target.
190 final String[] items = getTarget().getItems();
191 for (int i = 0; i < items.length; i++) {
192 model.add(i, items[i]);
193 }
194 }
195
196 public boolean isSkipStateChangedEvent() {
197 return skipStateChangedEvent;
198 }
199
200 public void setSkipStateChangedEvent(boolean skipStateChangedEvent) {
201 this.skipStateChangedEvent = skipStateChangedEvent;
202 }
203
204 @Override
205 public void valueChanged(final ListSelectionEvent e) {
206 if (!e.getValueIsAdjusting() && !isSkipStateChangedEvent()) {
207 final JList source = (JList) e.getSource();
208 for(int i = 0 ; i < source.getModel().getSize(); i++) {
209
210 final boolean wasSelected = Arrays.binarySearch(oldSelectedIndices, i) >= 0;
211 final boolean isSelected = source.isSelectedIndex(i);
212
213 if (wasSelected == isSelected) {
214 continue;
215 }
216
217 final int state = !wasSelected && isSelected ? ItemEvent.SELECTED: ItemEvent.DESELECTED;
218
219 LWListPeer.this.postEvent(new ItemEvent(getTarget(), ItemEvent.ITEM_STATE_CHANGED,
220 i, state));
221 }
222 oldSelectedIndices = source.getSelectedIndices();
223 }
224 }
225
226 public JList getView() {
227 return (JList) getViewport().getView();
228 }
229
230 public DefaultListModel<Object> getModel() {
231 return model;
232 }
233
234 @Override
235 public void setEnabled(final boolean enabled) {
236 getView().setEnabled(enabled);
237 super.setEnabled(enabled);
238 }
239
240 @Override
241 public void setOpaque(final boolean isOpaque) {
242 super.setOpaque(isOpaque);
243 if (getView() != null) {
244 getView().setOpaque(isOpaque);
245 }
246 }
247
248 private final class JListDelegate extends JList<Object> {
249
250 JListDelegate() {
251 super(ScrollableJList.this.model);
252 }
253
254 @Override
255 public boolean hasFocus() {
256 return getTarget().hasFocus();
257 }
258
259 @Override
260 protected void processMouseEvent(final MouseEvent e) {
261 super.processMouseEvent(e);
262 if (e.getID() == MouseEvent.MOUSE_CLICKED && e.getClickCount() == 2) {
263 final int index = locationToIndex(e.getPoint());
264 if (0 <= index && index < getModel().getSize()) {
265 LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
266 getModel().getElementAt(index).toString(), e.getWhen(), e.getModifiers()));
267 }
268 }
269 }
270
271 @Override
272 protected void processKeyEvent(final KeyEvent e) {
273 super.processKeyEvent(e);
274 if (e.getID() == KeyEvent.KEY_PRESSED && e.getKeyCode() == KeyEvent.VK_ENTER) {
275 final Object selectedValue = getSelectedValue();
276 if(selectedValue != null){
277 LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
278 selectedValue.toString(), e.getWhen(), e.getModifiers()));
279 }
280 }
281 }
282
283 //Needed for Autoscroller.
284 @Override
285 public Point getLocationOnScreen() {
286 return LWListPeer.this.getLocationOnScreen();
287 }
288 }
289 }
290 }