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 27 package sun.lwawt; 28 29 import java.awt.*; 30 import java.awt.event.ItemEvent; 31 import java.awt.event.ItemListener; 32 import java.awt.peer.ChoicePeer; 33 34 import javax.accessibility.Accessible; 35 import javax.swing.*; 36 37 final class LWChoicePeer extends LWComponentPeer<Choice, JComboBox<String>> 38 implements ChoicePeer, ItemListener { 39 40 /** 41 * According to Choice specification item events are sent in response to 42 * user input, but not in response to calls to select(). But JComboBox are 43 * sent item events in both cases. Should be used under delegateLock. 44 */ 45 private boolean skipPostMessage; 46 47 LWChoicePeer(final Choice target, 48 final PlatformComponent platformComponent) { 49 super(target, platformComponent); 50 } 51 52 @Override 53 protected JComboBox<String> createDelegate() { 54 return new JComboBoxDelegate(); 55 } 56 57 @Override 58 public void initialize() { 59 super.initialize(); 60 final Choice choice = getTarget(); 61 final JComboBox<String> combo = getDelegate(); 62 synchronized (getDelegateLock()) { 63 final int count = choice.getItemCount(); 64 for (int i = 0; i < count; ++i) { 65 combo.addItem(choice.getItem(i)); 66 } 67 select(choice.getSelectedIndex()); 68 69 // NOTE: the listener must be added at the very end, otherwise it 70 // fires events upon initialization of the combo box. 71 combo.addItemListener(this); 72 } 73 } 74 75 @Override 76 public void itemStateChanged(final ItemEvent e) { 77 // AWT Choice sends SELECTED event only whereas JComboBox 78 // sends both SELECTED and DESELECTED. 79 if (e.getStateChange() == ItemEvent.SELECTED) { 80 synchronized (getDelegateLock()) { 81 if (skipPostMessage) { 82 return; 83 } 84 getTarget().select(getDelegate().getSelectedIndex()); 85 } 86 postEvent(new ItemEvent(getTarget(), ItemEvent.ITEM_STATE_CHANGED, 87 e.getItem(), ItemEvent.SELECTED)); 88 } 89 } 90 91 @Override 92 public void add(final String item, final int index) { 93 synchronized (getDelegateLock()) { 94 getDelegate().insertItemAt(item, index); 95 } 96 } 97 98 @Override 99 public void remove(final int index) { 100 synchronized (getDelegateLock()) { 101 // We shouldn't post event, if selected item was removed. 102 skipPostMessage = true; 103 getDelegate().removeItemAt(index); 104 skipPostMessage = false; 105 } 106 } 107 108 @Override 109 public void removeAll() { 110 synchronized (getDelegateLock()) { 111 getDelegate().removeAllItems(); 112 } 113 } 114 115 @Override 116 public void select(final int index) { 117 synchronized (getDelegateLock()) { 118 if (index != getDelegate().getSelectedIndex()) { 119 skipPostMessage = true; 120 getDelegate().setSelectedIndex(index); 121 skipPostMessage = false; 122 } 123 } 124 } 125 126 @Override 127 public boolean isFocusable() { 128 return true; 129 } 130 131 private final class JComboBoxDelegate extends JComboBox<String> { 132 133 // Empty non private constructor was added because access to this 134 // class shouldn't be emulated by a synthetic accessor method. 135 JComboBoxDelegate() { 136 super(); 137 } 138 139 @Override 140 public boolean hasFocus() { 141 return getTarget().hasFocus(); 142 } 143 144 //Needed for proper popup menu location 145 @Override 146 public Point getLocationOnScreen() { 147 return LWChoicePeer.this.getLocationOnScreen(); 148 } 149 150 /** 151 * We should post ITEM_STATE_CHANGED event when the same element is 152 * reselected. 153 */ 154 @Override 155 public void setSelectedItem(final Object anObject) { 156 final Object oldSelection = selectedItemReminder; 157 if (oldSelection != null && oldSelection.equals(anObject)) { 158 selectedItemChanged(); 159 } 160 super.setSelectedItem(anObject); 161 } 162 163 @Override 164 public void firePopupMenuWillBecomeVisible() { 165 super.firePopupMenuWillBecomeVisible(); 166 SwingUtilities.invokeLater(new Runnable() { 167 @Override 168 public void run() { 169 JPopupMenu popupMenu = getPopupMenu(); 170 if (popupMenu != null) { 171 if (popupMenu.getInvoker() != LWChoicePeer.this.getTarget()) { 172 popupMenu.setVisible(false); 173 popupMenu.show(LWChoicePeer.this.getTarget(), 0, 0); 174 } 175 } 176 } 177 }); 178 } 179 180 private JPopupMenu getPopupMenu() { 181 for (int i = 0; i < getAccessibleContext().getAccessibleChildrenCount(); i++) { 182 Accessible child = getAccessibleContext().getAccessibleChild(i); 183 if (child instanceof JPopupMenu) { 184 return (JPopupMenu) child; 185 } 186 } 187 return null; 188 } 189 } 190 }