| 1 | package be.nikiroo.utils.ui; |
| 2 | |
| 3 | import java.awt.Component; |
| 4 | import java.awt.Point; |
| 5 | import java.awt.event.MouseAdapter; |
| 6 | import java.awt.event.MouseEvent; |
| 7 | import java.util.ArrayList; |
| 8 | import java.util.Collection; |
| 9 | import java.util.List; |
| 10 | |
| 11 | import javax.swing.JList; |
| 12 | import javax.swing.JPopupMenu; |
| 13 | import javax.swing.ListCellRenderer; |
| 14 | |
| 15 | import be.nikiroo.utils.compat.DefaultListModel6; |
| 16 | import be.nikiroo.utils.compat.JList6; |
| 17 | import be.nikiroo.utils.compat.ListCellRenderer6; |
| 18 | |
| 19 | /** |
| 20 | * A {@link javax.swing.ListModel} that can maintain 2 lists; one with the |
| 21 | * actual data (the elements), and a second one with the items that are |
| 22 | * currently displayed (the items). |
| 23 | * <p> |
| 24 | * It also offers filter options, supports hovered changes and some more utility |
| 25 | * functions. |
| 26 | * |
| 27 | * @author niki |
| 28 | * |
| 29 | * @param <T> |
| 30 | * the type of elements and items (the same type) |
| 31 | */ |
| 32 | public class ListModel<T> extends DefaultListModel6<T> { |
| 33 | private static final long serialVersionUID = 1L; |
| 34 | |
| 35 | /** |
| 36 | * A filter interface, to check for a condition (note that a Predicate class |
| 37 | * already exists in Java 1.8+, and is compatible with this one if you |
| 38 | * change the signatures -- but I support java 1.6+). |
| 39 | * |
| 40 | * @author niki |
| 41 | * |
| 42 | * @param <T> |
| 43 | * the type of elements and items (the same type) |
| 44 | */ |
| 45 | public interface Predicate<T> { |
| 46 | /** |
| 47 | * Check if an item or an element pass a filter. |
| 48 | * |
| 49 | * @param item |
| 50 | * the item to test |
| 51 | * |
| 52 | * @return TRUE if the test passed, FALSE if not |
| 53 | */ |
| 54 | public boolean test(T item); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * A simple interface your elements must implement if you want to use |
| 59 | * {@link ListModel#generateRenderer(ListModel)}. |
| 60 | * |
| 61 | * @author niki |
| 62 | */ |
| 63 | public interface Hoverable { |
| 64 | /** |
| 65 | * The element is currently selected. |
| 66 | * |
| 67 | * @param selected |
| 68 | * TRUE for selected, FALSE for unselected |
| 69 | */ |
| 70 | public void setSelected(boolean selected); |
| 71 | |
| 72 | /** |
| 73 | * The element is currently under the mouse cursor. |
| 74 | * |
| 75 | * @param hovered |
| 76 | * TRUE if it is, FALSE if not |
| 77 | */ |
| 78 | public void setHovered(boolean hovered); |
| 79 | } |
| 80 | |
| 81 | private int hoveredIndex; |
| 82 | private List<T> items = new ArrayList<T>(); |
| 83 | private JList6<T> list; |
| 84 | private boolean keepSelection = true; |
| 85 | |
| 86 | /** |
| 87 | * Create a new {@link ListModel}. |
| 88 | * |
| 89 | * @param list |
| 90 | * the {@link JList} we will handle the data of (cannot be NULL) |
| 91 | */ |
| 92 | @SuppressWarnings({ "unchecked", "rawtypes" }) // not compatible Java 1.6 |
| 93 | public ListModel(JList list) { |
| 94 | this((JList6<T>) list); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Create a new {@link ListModel}. |
| 99 | * |
| 100 | * @param list |
| 101 | * the {@link JList} we will handle the data of (cannot be NULL) |
| 102 | * @param popup |
| 103 | * the popup to use and keep track of (can be NULL) |
| 104 | */ |
| 105 | @SuppressWarnings({ "unchecked", "rawtypes" }) // not compatible Java 1.6 |
| 106 | public ListModel(final JList list, final JPopupMenu popup) { |
| 107 | this((JList6<T>) list, popup); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Create a new {@link ListModel}. |
| 112 | * |
| 113 | * @param list |
| 114 | * the {@link JList6} we will handle the data of (cannot be NULL) |
| 115 | */ |
| 116 | public ListModel(JList6<T> list) { |
| 117 | this(list, null); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Create a new {@link ListModel}. |
| 122 | * |
| 123 | * @param list |
| 124 | * the {@link JList6} we will handle the data of (cannot be NULL) |
| 125 | * @param popup |
| 126 | * the popup to use and keep track of (can be NULL) |
| 127 | */ |
| 128 | public ListModel(final JList6<T> list, final JPopupMenu popup) { |
| 129 | this.list = list; |
| 130 | list.setModel(this); |
| 131 | |
| 132 | list.addMouseMotionListener(new MouseAdapter() { |
| 133 | @Override |
| 134 | public void mouseMoved(MouseEvent me) { |
| 135 | if (popup != null && popup.isShowing()) |
| 136 | return; |
| 137 | |
| 138 | Point p = new Point(me.getX(), me.getY()); |
| 139 | int index = list.locationToIndex(p); |
| 140 | if (index != hoveredIndex) { |
| 141 | int oldIndex = hoveredIndex; |
| 142 | hoveredIndex = index; |
| 143 | fireElementChanged(oldIndex); |
| 144 | fireElementChanged(index); |
| 145 | } |
| 146 | } |
| 147 | }); |
| 148 | |
| 149 | list.addMouseListener(new MouseAdapter() { |
| 150 | @Override |
| 151 | public void mousePressed(MouseEvent e) { |
| 152 | check(e); |
| 153 | } |
| 154 | |
| 155 | @Override |
| 156 | public void mouseReleased(MouseEvent e) { |
| 157 | check(e); |
| 158 | } |
| 159 | |
| 160 | @Override |
| 161 | public void mouseExited(MouseEvent e) { |
| 162 | if (popup != null && popup.isShowing()) |
| 163 | return; |
| 164 | |
| 165 | if (hoveredIndex > -1) { |
| 166 | int oldIndex = hoveredIndex; |
| 167 | hoveredIndex = -1; |
| 168 | fireElementChanged(oldIndex); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | private void check(MouseEvent e) { |
| 173 | if (popup == null) { |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | if (e.isPopupTrigger()) { |
| 178 | if (list.getSelectedIndices().length <= 1) { |
| 179 | list.setSelectedIndex( |
| 180 | list.locationToIndex(e.getPoint())); |
| 181 | } |
| 182 | |
| 183 | popup.show(list, e.getX(), e.getY()); |
| 184 | } |
| 185 | } |
| 186 | }); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * (Try and) keep the elements that were selected when filtering. |
| 191 | * <p> |
| 192 | * This will use toString on the elements to identify them, and can be a bit |
| 193 | * resource intensive. |
| 194 | * |
| 195 | * @return TRUE if we do |
| 196 | */ |
| 197 | public boolean isKeepSelection() { |
| 198 | return keepSelection; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * (Try and) keep the elements that were selected when filtering. |
| 203 | * <p> |
| 204 | * This will use toString on the elements to identify them, and can be a bit |
| 205 | * resource intensive. |
| 206 | * |
| 207 | * @param keepSelection |
| 208 | * TRUE to try and keep them selected |
| 209 | */ |
| 210 | public void setKeepSelection(boolean keepSelection) { |
| 211 | this.keepSelection = keepSelection; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Check if this element is currently under the mouse. |
| 216 | * |
| 217 | * @param element |
| 218 | * the element to check |
| 219 | * |
| 220 | * @return TRUE if it is |
| 221 | */ |
| 222 | public boolean isHovered(T element) { |
| 223 | return indexOf(element) == hoveredIndex; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Check if this element is currently under the mouse. |
| 228 | * |
| 229 | * @param index |
| 230 | * the index of the element to check |
| 231 | * |
| 232 | * @return TRUE if it is |
| 233 | */ |
| 234 | public boolean isHovered(int index) { |
| 235 | return index == hoveredIndex; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Add an item to the model. |
| 240 | * |
| 241 | * @param item |
| 242 | * the new item to add |
| 243 | */ |
| 244 | public void addItem(T item) { |
| 245 | items.add(item); |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Add items to the model. |
| 250 | * |
| 251 | * @param items |
| 252 | * the new items to add |
| 253 | */ |
| 254 | public void addAllItems(Collection<T> items) { |
| 255 | this.items.addAll(items); |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Removes the first occurrence of the specified element from this list, if |
| 260 | * it is present (optional operation). |
| 261 | * |
| 262 | * @param item |
| 263 | * the item to remove if possible (can be NULL) |
| 264 | * |
| 265 | * @return TRUE if one element was removed, FALSE if not found |
| 266 | */ |
| 267 | public boolean removeItem(T item) { |
| 268 | return items.remove(item); |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Remove the items that pass the given filter (or all items if the filter |
| 273 | * is NULL). |
| 274 | * |
| 275 | * @param filter |
| 276 | * the filter (if the filter returns TRUE, the item will be |
| 277 | * removed) |
| 278 | * |
| 279 | * @return TRUE if at least one item was removed |
| 280 | */ |
| 281 | public boolean removeItemIf(Predicate<T> filter) { |
| 282 | boolean changed = false; |
| 283 | if (filter == null) { |
| 284 | changed = !items.isEmpty(); |
| 285 | clearItems(); |
| 286 | } else { |
| 287 | for (int i = 0; i < items.size(); i++) { |
| 288 | if (filter.test(items.get(i))) { |
| 289 | items.remove(i--); |
| 290 | changed = true; |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | return changed; |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Removes all the items from this model. |
| 300 | */ |
| 301 | public void clearItems() { |
| 302 | items.clear(); |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Filter the current elements. |
| 307 | * <p> |
| 308 | * This method will clear all the elements then look into all the items: |
| 309 | * those that pass the given filter will be copied as elements. |
| 310 | * |
| 311 | * @param filter |
| 312 | * the filter to select which elements to keep; an item that pass |
| 313 | * the filter will be copied as an element (can be NULL, in that |
| 314 | * case all items will be copied as elements) |
| 315 | */ |
| 316 | @SuppressWarnings("unchecked") // ListModel<T> and JList<T> are not java 1.6 |
| 317 | public void filter(Predicate<T> filter) { |
| 318 | ListSnapshot snapshot = null; |
| 319 | |
| 320 | if (keepSelection) |
| 321 | snapshot = new ListSnapshot(list); |
| 322 | |
| 323 | clear(); |
| 324 | for (T item : items) { |
| 325 | if (filter == null || filter.test(item)) { |
| 326 | addElement(item); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | if (keepSelection) |
| 331 | snapshot.apply(); |
| 332 | |
| 333 | list.repaint(); |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Return the currently selected elements. |
| 338 | * |
| 339 | * @return the selected elements |
| 340 | */ |
| 341 | public List<T> getSelectedElements() { |
| 342 | List<T> selected = new ArrayList<T>(); |
| 343 | for (int index : list.getSelectedIndices()) { |
| 344 | selected.add(get(index)); |
| 345 | } |
| 346 | |
| 347 | return selected; |
| 348 | } |
| 349 | |
| 350 | /** |
| 351 | * Return the selected element if <b>one</b> and <b>only one</b> element is |
| 352 | * selected. I.E., if zero, two or more elements are selected, NULL will be |
| 353 | * returned. |
| 354 | * |
| 355 | * @return the element if it is the only selected element, NULL otherwise |
| 356 | */ |
| 357 | public T getUniqueSelectedElement() { |
| 358 | List<T> selected = getSelectedElements(); |
| 359 | if (selected.size() == 1) { |
| 360 | return selected.get(0); |
| 361 | } |
| 362 | |
| 363 | return null; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * Notify that this element has been changed. |
| 368 | * |
| 369 | * @param index |
| 370 | * the index of the element |
| 371 | */ |
| 372 | public void fireElementChanged(int index) { |
| 373 | if (index >= 0) { |
| 374 | fireContentsChanged(this, index, index); |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * Notify that this element has been changed. |
| 380 | * |
| 381 | * @param element |
| 382 | * the element |
| 383 | */ |
| 384 | public void fireElementChanged(T element) { |
| 385 | int index = indexOf(element); |
| 386 | if (index >= 0) { |
| 387 | fireContentsChanged(this, index, index); |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | @SuppressWarnings("unchecked") // ListModel<T> and JList<T> are not java 1.6 |
| 392 | @Override |
| 393 | public T get(int index) { |
| 394 | return (T) super.get(index); |
| 395 | } |
| 396 | |
| 397 | /** |
| 398 | * Generate a {@link ListCellRenderer} that supports {@link Hoverable} |
| 399 | * elements. |
| 400 | * |
| 401 | * @param <T> |
| 402 | * the type of elements and items (the same type), which should |
| 403 | * implement {@link Hoverable} (it will not cause issues if not, |
| 404 | * but then, it will be a default renderer) |
| 405 | * @param model |
| 406 | * the model to use |
| 407 | * |
| 408 | * @return a suitable, {@link Hoverable} compatible renderer |
| 409 | */ |
| 410 | static public <T extends Component> ListCellRenderer6<T> generateRenderer( |
| 411 | final ListModel<T> model) { |
| 412 | return new ListCellRenderer6<T>() { |
| 413 | @Override |
| 414 | public Component getListCellRendererComponent(JList6<T> list, |
| 415 | T item, int index, boolean isSelected, |
| 416 | boolean cellHasFocus) { |
| 417 | if (item instanceof Hoverable) { |
| 418 | Hoverable hoverable = (Hoverable) item; |
| 419 | hoverable.setSelected(isSelected); |
| 420 | hoverable.setHovered(model.isHovered(index)); |
| 421 | } |
| 422 | |
| 423 | return item; |
| 424 | } |
| 425 | }; |
| 426 | } |
| 427 | } |