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         @Override
 249         public void setFont(Font font) {
 250             super.setFont(font);
 251             if (getView() != null) {
 252                 getView().setFont(font);
 253                 LWListPeer.this.revalidate();
 254             }
 255         }
 256         
 257         private final class JListDelegate extends JList<Object> {
 258 
 259             JListDelegate() {
 260                 super(ScrollableJList.this.model);
 261             }
 262 
 263             @Override
 264             public boolean hasFocus() {
 265                 return getTarget().hasFocus();
 266             }
 267 
 268             @Override
 269             protected void processMouseEvent(final MouseEvent e) {
 270                 super.processMouseEvent(e);
 271                 if (e.getID() == MouseEvent.MOUSE_CLICKED && e.getClickCount() == 2) {
 272                     final int index = locationToIndex(e.getPoint());
 273                     if (0 <= index && index < getModel().getSize()) {
 274                         LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
 275                             getModel().getElementAt(index).toString(), e.getWhen(), e.getModifiers()));
 276                     }
 277                 }
 278             }
 279 
 280             @Override
 281             protected void processKeyEvent(final KeyEvent e) {
 282                 super.processKeyEvent(e);
 283                 if (e.getID() == KeyEvent.KEY_PRESSED && e.getKeyCode() == KeyEvent.VK_ENTER) {
 284                     final Object selectedValue = getSelectedValue();
 285                     if(selectedValue != null){
 286                         LWListPeer.this.postEvent(new ActionEvent(getTarget(), ActionEvent.ACTION_PERFORMED,
 287                             selectedValue.toString(), e.getWhen(), e.getModifiers()));
 288                     }
 289                 }
 290             }
 291 
 292             //Needed for Autoscroller.
 293             @Override
 294             public Point getLocationOnScreen() {
 295                 return LWListPeer.this.getLocationOnScreen();
 296             }
 297         }
 298     }
 299 }