J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.swing; |
| 27 | |
| 28 | |
| 29 | import javax.swing.border.*; |
| 30 | |
| 31 | import java.awt.LayoutManager; |
| 32 | import java.awt.Component; |
| 33 | import java.awt.Container; |
| 34 | import java.awt.Rectangle; |
| 35 | import java.awt.Dimension; |
| 36 | import java.awt.Insets; |
| 37 | import java.io.Serializable; |
| 38 | |
| 39 | |
| 40 | /** |
| 41 | * The layout manager used by <code>JScrollPane</code>. |
| 42 | * <code>JScrollPaneLayout</code> is |
| 43 | * responsible for nine components: a viewport, two scrollbars, |
| 44 | * a row header, a column header, and four "corner" components. |
| 45 | * <p> |
| 46 | * <strong>Warning:</strong> |
| 47 | * Serialized objects of this class will not be compatible with |
| 48 | * future Swing releases. The current serialization support is |
| 49 | * appropriate for short term storage or RMI between applications running |
| 50 | * the same version of Swing. As of 1.4, support for long term storage |
| 51 | * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| 52 | * has been added to the <code>java.beans</code> package. |
| 53 | * Please see {@link java.beans.XMLEncoder}. |
| 54 | * |
| 55 | * @see JScrollPane |
| 56 | * @see JViewport |
| 57 | * |
| 58 | * @author Hans Muller |
| 59 | */ |
| 60 | public class ScrollPaneLayout |
| 61 | implements LayoutManager, ScrollPaneConstants, Serializable |
| 62 | { |
| 63 | |
| 64 | /** |
| 65 | * The scrollpane's viewport child. |
| 66 | * Default is an empty <code>JViewport</code>. |
| 67 | * @see JScrollPane#setViewport |
| 68 | */ |
| 69 | protected JViewport viewport; |
| 70 | |
| 71 | |
| 72 | /** |
| 73 | * The scrollpane's vertical scrollbar child. |
| 74 | * Default is a <code>JScrollBar</code>. |
| 75 | * @see JScrollPane#setVerticalScrollBar |
| 76 | */ |
| 77 | protected JScrollBar vsb; |
| 78 | |
| 79 | |
| 80 | /** |
| 81 | * The scrollpane's horizontal scrollbar child. |
| 82 | * Default is a <code>JScrollBar</code>. |
| 83 | * @see JScrollPane#setHorizontalScrollBar |
| 84 | */ |
| 85 | protected JScrollBar hsb; |
| 86 | |
| 87 | |
| 88 | /** |
| 89 | * The row header child. Default is <code>null</code>. |
| 90 | * @see JScrollPane#setRowHeader |
| 91 | */ |
| 92 | protected JViewport rowHead; |
| 93 | |
| 94 | |
| 95 | /** |
| 96 | * The column header child. Default is <code>null</code>. |
| 97 | * @see JScrollPane#setColumnHeader |
| 98 | */ |
| 99 | protected JViewport colHead; |
| 100 | |
| 101 | |
| 102 | /** |
| 103 | * The component to display in the lower left corner. |
| 104 | * Default is <code>null</code>. |
| 105 | * @see JScrollPane#setCorner |
| 106 | */ |
| 107 | protected Component lowerLeft; |
| 108 | |
| 109 | |
| 110 | /** |
| 111 | * The component to display in the lower right corner. |
| 112 | * Default is <code>null</code>. |
| 113 | * @see JScrollPane#setCorner |
| 114 | */ |
| 115 | protected Component lowerRight; |
| 116 | |
| 117 | |
| 118 | /** |
| 119 | * The component to display in the upper left corner. |
| 120 | * Default is <code>null</code>. |
| 121 | * @see JScrollPane#setCorner |
| 122 | */ |
| 123 | protected Component upperLeft; |
| 124 | |
| 125 | |
| 126 | /** |
| 127 | * The component to display in the upper right corner. |
| 128 | * Default is <code>null</code>. |
| 129 | * @see JScrollPane#setCorner |
| 130 | */ |
| 131 | protected Component upperRight; |
| 132 | |
| 133 | |
| 134 | /** |
| 135 | * The display policy for the vertical scrollbar. |
| 136 | * The default is <code>ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED</code>. |
| 137 | * <p> |
| 138 | * This field is obsolete, please use the <code>JScrollPane</code> field instead. |
| 139 | * |
| 140 | * @see JScrollPane#setVerticalScrollBarPolicy |
| 141 | */ |
| 142 | protected int vsbPolicy = VERTICAL_SCROLLBAR_AS_NEEDED; |
| 143 | |
| 144 | |
| 145 | /** |
| 146 | * The display policy for the horizontal scrollbar. |
| 147 | * The default is <code>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED</code>. |
| 148 | * <p> |
| 149 | * This field is obsolete, please use the <code>JScrollPane</code> field instead. |
| 150 | * |
| 151 | * @see JScrollPane#setHorizontalScrollBarPolicy |
| 152 | */ |
| 153 | protected int hsbPolicy = HORIZONTAL_SCROLLBAR_AS_NEEDED; |
| 154 | |
| 155 | |
| 156 | /** |
| 157 | * This method is invoked after the ScrollPaneLayout is set as the |
| 158 | * LayoutManager of a <code>JScrollPane</code>. |
| 159 | * It initializes all of the internal fields that |
| 160 | * are ordinarily set by <code>addLayoutComponent</code>. For example: |
| 161 | * <pre> |
| 162 | * ScrollPaneLayout mySPLayout = new ScrollPanelLayout() { |
| 163 | * public void layoutContainer(Container p) { |
| 164 | * super.layoutContainer(p); |
| 165 | * // do some extra work here ... |
| 166 | * } |
| 167 | * }; |
| 168 | * scrollpane.setLayout(mySPLayout): |
| 169 | * </pre> |
| 170 | */ |
| 171 | public void syncWithScrollPane(JScrollPane sp) { |
| 172 | viewport = sp.getViewport(); |
| 173 | vsb = sp.getVerticalScrollBar(); |
| 174 | hsb = sp.getHorizontalScrollBar(); |
| 175 | rowHead = sp.getRowHeader(); |
| 176 | colHead = sp.getColumnHeader(); |
| 177 | lowerLeft = sp.getCorner(LOWER_LEFT_CORNER); |
| 178 | lowerRight = sp.getCorner(LOWER_RIGHT_CORNER); |
| 179 | upperLeft = sp.getCorner(UPPER_LEFT_CORNER); |
| 180 | upperRight = sp.getCorner(UPPER_RIGHT_CORNER); |
| 181 | vsbPolicy = sp.getVerticalScrollBarPolicy(); |
| 182 | hsbPolicy = sp.getHorizontalScrollBarPolicy(); |
| 183 | } |
| 184 | |
| 185 | |
| 186 | /** |
| 187 | * Removes an existing component. When a new component, such as |
| 188 | * the left corner, or vertical scrollbar, is added, the old one, |
| 189 | * if it exists, must be removed. |
| 190 | * <p> |
| 191 | * This method returns <code>newC</code>. If <code>oldC</code> is |
| 192 | * not equal to <code>newC</code> and is non-<code>null</code>, |
| 193 | * it will be removed from its parent. |
| 194 | * |
| 195 | * @param oldC the <code>Component</code> to replace |
| 196 | * @param newC the <code>Component</code> to add |
| 197 | * @return the <code>newC</code> |
| 198 | */ |
| 199 | protected Component addSingletonComponent(Component oldC, Component newC) |
| 200 | { |
| 201 | if ((oldC != null) && (oldC != newC)) { |
| 202 | oldC.getParent().remove(oldC); |
| 203 | } |
| 204 | return newC; |
| 205 | } |
| 206 | |
| 207 | |
| 208 | /** |
| 209 | * Adds the specified component to the layout. The layout is |
| 210 | * identified using one of: |
| 211 | * <ul> |
| 212 | * <li>ScrollPaneConstants.VIEWPORT |
| 213 | * <li>ScrollPaneConstants.VERTICAL_SCROLLBAR |
| 214 | * <li>ScrollPaneConstants.HORIZONTAL_SCROLLBAR |
| 215 | * <li>ScrollPaneConstants.ROW_HEADER |
| 216 | * <li>ScrollPaneConstants.COLUMN_HEADER |
| 217 | * <li>ScrollPaneConstants.LOWER_LEFT_CORNER |
| 218 | * <li>ScrollPaneConstants.LOWER_RIGHT_CORNER |
| 219 | * <li>ScrollPaneConstants.UPPER_LEFT_CORNER |
| 220 | * <li>ScrollPaneConstants.UPPER_RIGHT_CORNER |
| 221 | * </ul> |
| 222 | * |
| 223 | * @param s the component identifier |
| 224 | * @param c the the component to be added |
| 225 | * @exception IllegalArgumentException if <code>s</code> is an invalid key |
| 226 | */ |
| 227 | public void addLayoutComponent(String s, Component c) |
| 228 | { |
| 229 | if (s.equals(VIEWPORT)) { |
| 230 | viewport = (JViewport)addSingletonComponent(viewport, c); |
| 231 | } |
| 232 | else if (s.equals(VERTICAL_SCROLLBAR)) { |
| 233 | vsb = (JScrollBar)addSingletonComponent(vsb, c); |
| 234 | } |
| 235 | else if (s.equals(HORIZONTAL_SCROLLBAR)) { |
| 236 | hsb = (JScrollBar)addSingletonComponent(hsb, c); |
| 237 | } |
| 238 | else if (s.equals(ROW_HEADER)) { |
| 239 | rowHead = (JViewport)addSingletonComponent(rowHead, c); |
| 240 | } |
| 241 | else if (s.equals(COLUMN_HEADER)) { |
| 242 | colHead = (JViewport)addSingletonComponent(colHead, c); |
| 243 | } |
| 244 | else if (s.equals(LOWER_LEFT_CORNER)) { |
| 245 | lowerLeft = addSingletonComponent(lowerLeft, c); |
| 246 | } |
| 247 | else if (s.equals(LOWER_RIGHT_CORNER)) { |
| 248 | lowerRight = addSingletonComponent(lowerRight, c); |
| 249 | } |
| 250 | else if (s.equals(UPPER_LEFT_CORNER)) { |
| 251 | upperLeft = addSingletonComponent(upperLeft, c); |
| 252 | } |
| 253 | else if (s.equals(UPPER_RIGHT_CORNER)) { |
| 254 | upperRight = addSingletonComponent(upperRight, c); |
| 255 | } |
| 256 | else { |
| 257 | throw new IllegalArgumentException("invalid layout key " + s); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | |
| 262 | /** |
| 263 | * Removes the specified component from the layout. |
| 264 | * |
| 265 | * @param c the component to remove |
| 266 | */ |
| 267 | public void removeLayoutComponent(Component c) |
| 268 | { |
| 269 | if (c == viewport) { |
| 270 | viewport = null; |
| 271 | } |
| 272 | else if (c == vsb) { |
| 273 | vsb = null; |
| 274 | } |
| 275 | else if (c == hsb) { |
| 276 | hsb = null; |
| 277 | } |
| 278 | else if (c == rowHead) { |
| 279 | rowHead = null; |
| 280 | } |
| 281 | else if (c == colHead) { |
| 282 | colHead = null; |
| 283 | } |
| 284 | else if (c == lowerLeft) { |
| 285 | lowerLeft = null; |
| 286 | } |
| 287 | else if (c == lowerRight) { |
| 288 | lowerRight = null; |
| 289 | } |
| 290 | else if (c == upperLeft) { |
| 291 | upperLeft = null; |
| 292 | } |
| 293 | else if (c == upperRight) { |
| 294 | upperRight = null; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | |
| 299 | /** |
| 300 | * Returns the vertical scrollbar-display policy. |
| 301 | * |
| 302 | * @return an integer giving the display policy |
| 303 | * @see #setVerticalScrollBarPolicy |
| 304 | */ |
| 305 | public int getVerticalScrollBarPolicy() { |
| 306 | return vsbPolicy; |
| 307 | } |
| 308 | |
| 309 | |
| 310 | /** |
| 311 | * Sets the vertical scrollbar-display policy. The options |
| 312 | * are: |
| 313 | * <ul> |
| 314 | * <li>ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED |
| 315 | * <li>ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER |
| 316 | * <li>ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS |
| 317 | * </ul> |
| 318 | * Note: Applications should use the <code>JScrollPane</code> version |
| 319 | * of this method. It only exists for backwards compatibility |
| 320 | * with the Swing 1.0.2 (and earlier) versions of this class. |
| 321 | * |
| 322 | * @param x an integer giving the display policy |
| 323 | * @exception IllegalArgumentException if <code>x</code> is an invalid |
| 324 | * vertical scroll bar policy, as listed above |
| 325 | */ |
| 326 | public void setVerticalScrollBarPolicy(int x) { |
| 327 | switch (x) { |
| 328 | case VERTICAL_SCROLLBAR_AS_NEEDED: |
| 329 | case VERTICAL_SCROLLBAR_NEVER: |
| 330 | case VERTICAL_SCROLLBAR_ALWAYS: |
| 331 | vsbPolicy = x; |
| 332 | break; |
| 333 | default: |
| 334 | throw new IllegalArgumentException("invalid verticalScrollBarPolicy"); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | |
| 339 | /** |
| 340 | * Returns the horizontal scrollbar-display policy. |
| 341 | * |
| 342 | * @return an integer giving the display policy |
| 343 | * @see #setHorizontalScrollBarPolicy |
| 344 | */ |
| 345 | public int getHorizontalScrollBarPolicy() { |
| 346 | return hsbPolicy; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Sets the horizontal scrollbar-display policy. |
| 351 | * The options are:<ul> |
| 352 | * <li>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED |
| 353 | * <li>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER |
| 354 | * <li>ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS |
| 355 | * </ul> |
| 356 | * Note: Applications should use the <code>JScrollPane</code> version |
| 357 | * of this method. It only exists for backwards compatibility |
| 358 | * with the Swing 1.0.2 (and earlier) versions of this class. |
| 359 | * |
| 360 | * @param x an int giving the display policy |
| 361 | * @exception IllegalArgumentException if <code>x</code> is not a valid |
| 362 | * horizontal scrollbar policy, as listed above |
| 363 | */ |
| 364 | public void setHorizontalScrollBarPolicy(int x) { |
| 365 | switch (x) { |
| 366 | case HORIZONTAL_SCROLLBAR_AS_NEEDED: |
| 367 | case HORIZONTAL_SCROLLBAR_NEVER: |
| 368 | case HORIZONTAL_SCROLLBAR_ALWAYS: |
| 369 | hsbPolicy = x; |
| 370 | break; |
| 371 | default: |
| 372 | throw new IllegalArgumentException("invalid horizontalScrollBarPolicy"); |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | |
| 377 | /** |
| 378 | * Returns the <code>JViewport</code> object that displays the |
| 379 | * scrollable contents. |
| 380 | * @return the <code>JViewport</code> object that displays the scrollable contents |
| 381 | * @see JScrollPane#getViewport |
| 382 | */ |
| 383 | public JViewport getViewport() { |
| 384 | return viewport; |
| 385 | } |
| 386 | |
| 387 | |
| 388 | /** |
| 389 | * Returns the <code>JScrollBar</code> object that handles horizontal scrolling. |
| 390 | * @return the <code>JScrollBar</code> object that handles horizontal scrolling |
| 391 | * @see JScrollPane#getHorizontalScrollBar |
| 392 | */ |
| 393 | public JScrollBar getHorizontalScrollBar() { |
| 394 | return hsb; |
| 395 | } |
| 396 | |
| 397 | /** |
| 398 | * Returns the <code>JScrollBar</code> object that handles vertical scrolling. |
| 399 | * @return the <code>JScrollBar</code> object that handles vertical scrolling |
| 400 | * @see JScrollPane#getVerticalScrollBar |
| 401 | */ |
| 402 | public JScrollBar getVerticalScrollBar() { |
| 403 | return vsb; |
| 404 | } |
| 405 | |
| 406 | |
| 407 | /** |
| 408 | * Returns the <code>JViewport</code> object that is the row header. |
| 409 | * @return the <code>JViewport</code> object that is the row header |
| 410 | * @see JScrollPane#getRowHeader |
| 411 | */ |
| 412 | public JViewport getRowHeader() { |
| 413 | return rowHead; |
| 414 | } |
| 415 | |
| 416 | |
| 417 | /** |
| 418 | * Returns the <code>JViewport</code> object that is the column header. |
| 419 | * @return the <code>JViewport</code> object that is the column header |
| 420 | * @see JScrollPane#getColumnHeader |
| 421 | */ |
| 422 | public JViewport getColumnHeader() { |
| 423 | return colHead; |
| 424 | } |
| 425 | |
| 426 | |
| 427 | /** |
| 428 | * Returns the <code>Component</code> at the specified corner. |
| 429 | * @param key the <code>String</code> specifying the corner |
| 430 | * @return the <code>Component</code> at the specified corner, as defined in |
| 431 | * {@link ScrollPaneConstants}; if <code>key</code> is not one of the |
| 432 | * four corners, <code>null</code> is returned |
| 433 | * @see JScrollPane#getCorner |
| 434 | */ |
| 435 | public Component getCorner(String key) { |
| 436 | if (key.equals(LOWER_LEFT_CORNER)) { |
| 437 | return lowerLeft; |
| 438 | } |
| 439 | else if (key.equals(LOWER_RIGHT_CORNER)) { |
| 440 | return lowerRight; |
| 441 | } |
| 442 | else if (key.equals(UPPER_LEFT_CORNER)) { |
| 443 | return upperLeft; |
| 444 | } |
| 445 | else if (key.equals(UPPER_RIGHT_CORNER)) { |
| 446 | return upperRight; |
| 447 | } |
| 448 | else { |
| 449 | return null; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | |
| 454 | /** |
| 455 | * The preferred size of a <code>ScrollPane</code> is the size of the insets, |
| 456 | * plus the preferred size of the viewport, plus the preferred size of |
| 457 | * the visible headers, plus the preferred size of the scrollbars |
| 458 | * that will appear given the current view and the current |
| 459 | * scrollbar displayPolicies. |
| 460 | * <p>Note that the rowHeader is calculated as part of the preferred width |
| 461 | * and the colHeader is calculated as part of the preferred size. |
| 462 | * |
| 463 | * @param parent the <code>Container</code> that will be laid out |
| 464 | * @return a <code>Dimension</code> object specifying the preferred size of the |
| 465 | * viewport and any scrollbars |
| 466 | * @see ViewportLayout |
| 467 | * @see LayoutManager |
| 468 | */ |
| 469 | public Dimension preferredLayoutSize(Container parent) |
| 470 | { |
| 471 | /* Sync the (now obsolete) policy fields with the |
| 472 | * JScrollPane. |
| 473 | */ |
| 474 | JScrollPane scrollPane = (JScrollPane)parent; |
| 475 | vsbPolicy = scrollPane.getVerticalScrollBarPolicy(); |
| 476 | hsbPolicy = scrollPane.getHorizontalScrollBarPolicy(); |
| 477 | |
| 478 | Insets insets = parent.getInsets(); |
| 479 | int prefWidth = insets.left + insets.right; |
| 480 | int prefHeight = insets.top + insets.bottom; |
| 481 | |
| 482 | /* Note that viewport.getViewSize() is equivalent to |
| 483 | * viewport.getView().getPreferredSize() modulo a null |
| 484 | * view or a view whose size was explicitly set. |
| 485 | */ |
| 486 | |
| 487 | Dimension extentSize = null; |
| 488 | Dimension viewSize = null; |
| 489 | Component view = null; |
| 490 | |
| 491 | if (viewport != null) { |
| 492 | extentSize = viewport.getPreferredSize(); |
| 493 | view = viewport.getView(); |
| 494 | viewSize = view.getPreferredSize(); |
| 495 | } |
| 496 | |
| 497 | /* If there's a viewport add its preferredSize. |
| 498 | */ |
| 499 | |
| 500 | if (extentSize != null) { |
| 501 | prefWidth += extentSize.width; |
| 502 | prefHeight += extentSize.height; |
| 503 | } |
| 504 | |
| 505 | /* If there's a JScrollPane.viewportBorder, add its insets. |
| 506 | */ |
| 507 | |
| 508 | Border viewportBorder = scrollPane.getViewportBorder(); |
| 509 | if (viewportBorder != null) { |
| 510 | Insets vpbInsets = viewportBorder.getBorderInsets(parent); |
| 511 | prefWidth += vpbInsets.left + vpbInsets.right; |
| 512 | prefHeight += vpbInsets.top + vpbInsets.bottom; |
| 513 | } |
| 514 | |
| 515 | /* If a header exists and it's visible, factor its |
| 516 | * preferred size in. |
| 517 | */ |
| 518 | |
| 519 | if ((rowHead != null) && rowHead.isVisible()) { |
| 520 | prefWidth += rowHead.getPreferredSize().width; |
| 521 | } |
| 522 | |
| 523 | if ((colHead != null) && colHead.isVisible()) { |
| 524 | prefHeight += colHead.getPreferredSize().height; |
| 525 | } |
| 526 | |
| 527 | /* If a scrollbar is going to appear, factor its preferred size in. |
| 528 | * If the scrollbars policy is AS_NEEDED, this can be a little |
| 529 | * tricky: |
| 530 | * |
| 531 | * - If the view is a Scrollable then scrollableTracksViewportWidth |
| 532 | * and scrollableTracksViewportHeight can be used to effectively |
| 533 | * disable scrolling (if they're true) in their respective dimensions. |
| 534 | * |
| 535 | * - Assuming that a scrollbar hasn't been disabled by the |
| 536 | * previous constraint, we need to decide if the scrollbar is going |
| 537 | * to appear to correctly compute the JScrollPanes preferred size. |
| 538 | * To do this we compare the preferredSize of the viewport (the |
| 539 | * extentSize) to the preferredSize of the view. Although we're |
| 540 | * not responsible for laying out the view we'll assume that the |
| 541 | * JViewport will always give it its preferredSize. |
| 542 | */ |
| 543 | |
| 544 | if ((vsb != null) && (vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) { |
| 545 | if (vsbPolicy == VERTICAL_SCROLLBAR_ALWAYS) { |
| 546 | prefWidth += vsb.getPreferredSize().width; |
| 547 | } |
| 548 | else if ((viewSize != null) && (extentSize != null)) { |
| 549 | boolean canScroll = true; |
| 550 | if (view instanceof Scrollable) { |
| 551 | canScroll = !((Scrollable)view).getScrollableTracksViewportHeight(); |
| 552 | } |
| 553 | if (canScroll && (viewSize.height > extentSize.height)) { |
| 554 | prefWidth += vsb.getPreferredSize().width; |
| 555 | } |
| 556 | } |
| 557 | } |
| 558 | |
| 559 | if ((hsb != null) && (hsbPolicy != HORIZONTAL_SCROLLBAR_NEVER)) { |
| 560 | if (hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS) { |
| 561 | prefHeight += hsb.getPreferredSize().height; |
| 562 | } |
| 563 | else if ((viewSize != null) && (extentSize != null)) { |
| 564 | boolean canScroll = true; |
| 565 | if (view instanceof Scrollable) { |
| 566 | canScroll = !((Scrollable)view).getScrollableTracksViewportWidth(); |
| 567 | } |
| 568 | if (canScroll && (viewSize.width > extentSize.width)) { |
| 569 | prefHeight += hsb.getPreferredSize().height; |
| 570 | } |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | return new Dimension(prefWidth, prefHeight); |
| 575 | } |
| 576 | |
| 577 | |
| 578 | /** |
| 579 | * The minimum size of a <code>ScrollPane</code> is the size of the insets |
| 580 | * plus minimum size of the viewport, plus the scrollpane's |
| 581 | * viewportBorder insets, plus the minimum size |
| 582 | * of the visible headers, plus the minimum size of the |
| 583 | * scrollbars whose displayPolicy isn't NEVER. |
| 584 | * |
| 585 | * @param parent the <code>Container</code> that will be laid out |
| 586 | * @return a <code>Dimension</code> object specifying the minimum size |
| 587 | */ |
| 588 | public Dimension minimumLayoutSize(Container parent) |
| 589 | { |
| 590 | /* Sync the (now obsolete) policy fields with the |
| 591 | * JScrollPane. |
| 592 | */ |
| 593 | JScrollPane scrollPane = (JScrollPane)parent; |
| 594 | vsbPolicy = scrollPane.getVerticalScrollBarPolicy(); |
| 595 | hsbPolicy = scrollPane.getHorizontalScrollBarPolicy(); |
| 596 | |
| 597 | Insets insets = parent.getInsets(); |
| 598 | int minWidth = insets.left + insets.right; |
| 599 | int minHeight = insets.top + insets.bottom; |
| 600 | |
| 601 | /* If there's a viewport add its minimumSize. |
| 602 | */ |
| 603 | |
| 604 | if (viewport != null) { |
| 605 | Dimension size = viewport.getMinimumSize(); |
| 606 | minWidth += size.width; |
| 607 | minHeight += size.height; |
| 608 | } |
| 609 | |
| 610 | /* If there's a JScrollPane.viewportBorder, add its insets. |
| 611 | */ |
| 612 | |
| 613 | Border viewportBorder = scrollPane.getViewportBorder(); |
| 614 | if (viewportBorder != null) { |
| 615 | Insets vpbInsets = viewportBorder.getBorderInsets(parent); |
| 616 | minWidth += vpbInsets.left + vpbInsets.right; |
| 617 | minHeight += vpbInsets.top + vpbInsets.bottom; |
| 618 | } |
| 619 | |
| 620 | /* If a header exists and it's visible, factor its |
| 621 | * minimum size in. |
| 622 | */ |
| 623 | |
| 624 | if ((rowHead != null) && rowHead.isVisible()) { |
| 625 | Dimension size = rowHead.getMinimumSize(); |
| 626 | minWidth += size.width; |
| 627 | minHeight = Math.max(minHeight, size.height); |
| 628 | } |
| 629 | |
| 630 | if ((colHead != null) && colHead.isVisible()) { |
| 631 | Dimension size = colHead.getMinimumSize(); |
| 632 | minWidth = Math.max(minWidth, size.width); |
| 633 | minHeight += size.height; |
| 634 | } |
| 635 | |
| 636 | /* If a scrollbar might appear, factor its minimum |
| 637 | * size in. |
| 638 | */ |
| 639 | |
| 640 | if ((vsb != null) && (vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) { |
| 641 | Dimension size = vsb.getMinimumSize(); |
| 642 | minWidth += size.width; |
| 643 | minHeight = Math.max(minHeight, size.height); |
| 644 | } |
| 645 | |
| 646 | if ((hsb != null) && (hsbPolicy != HORIZONTAL_SCROLLBAR_NEVER)) { |
| 647 | Dimension size = hsb.getMinimumSize(); |
| 648 | minWidth = Math.max(minWidth, size.width); |
| 649 | minHeight += size.height; |
| 650 | } |
| 651 | |
| 652 | return new Dimension(minWidth, minHeight); |
| 653 | } |
| 654 | |
| 655 | |
| 656 | /** |
| 657 | * Lays out the scrollpane. The positioning of components depends on |
| 658 | * the following constraints: |
| 659 | * <ul> |
| 660 | * <li> The row header, if present and visible, gets its preferred |
| 661 | * width and the viewport's height. |
| 662 | * |
| 663 | * <li> The column header, if present and visible, gets its preferred |
| 664 | * height and the viewport's width. |
| 665 | * |
| 666 | * <li> If a vertical scrollbar is needed, i.e. if the viewport's extent |
| 667 | * height is smaller than its view height or if the <code>displayPolicy</code> |
| 668 | * is ALWAYS, it's treated like the row header with respect to its |
| 669 | * dimensions and is made visible. |
| 670 | * |
| 671 | * <li> If a horizontal scrollbar is needed, it is treated like the |
| 672 | * column header (see the paragraph above regarding the vertical scrollbar). |
| 673 | * |
| 674 | * <li> If the scrollpane has a non-<code>null</code> |
| 675 | * <code>viewportBorder</code>, then space is allocated for that. |
| 676 | * |
| 677 | * <li> The viewport gets the space available after accounting for |
| 678 | * the previous constraints. |
| 679 | * |
| 680 | * <li> The corner components, if provided, are aligned with the |
| 681 | * ends of the scrollbars and headers. If there is a vertical |
| 682 | * scrollbar, the right corners appear; if there is a horizontal |
| 683 | * scrollbar, the lower corners appear; a row header gets left |
| 684 | * corners, and a column header gets upper corners. |
| 685 | * </ul> |
| 686 | * |
| 687 | * @param parent the <code>Container</code> to lay out |
| 688 | */ |
| 689 | public void layoutContainer(Container parent) |
| 690 | { |
| 691 | /* Sync the (now obsolete) policy fields with the |
| 692 | * JScrollPane. |
| 693 | */ |
| 694 | JScrollPane scrollPane = (JScrollPane)parent; |
| 695 | vsbPolicy = scrollPane.getVerticalScrollBarPolicy(); |
| 696 | hsbPolicy = scrollPane.getHorizontalScrollBarPolicy(); |
| 697 | |
| 698 | Rectangle availR = scrollPane.getBounds(); |
| 699 | availR.x = availR.y = 0; |
| 700 | |
| 701 | Insets insets = parent.getInsets(); |
| 702 | availR.x = insets.left; |
| 703 | availR.y = insets.top; |
| 704 | availR.width -= insets.left + insets.right; |
| 705 | availR.height -= insets.top + insets.bottom; |
| 706 | |
| 707 | /* Get the scrollPane's orientation. |
| 708 | */ |
| 709 | boolean leftToRight = SwingUtilities.isLeftToRight(scrollPane); |
| 710 | |
| 711 | /* If there's a visible column header remove the space it |
| 712 | * needs from the top of availR. The column header is treated |
| 713 | * as if it were fixed height, arbitrary width. |
| 714 | */ |
| 715 | |
| 716 | Rectangle colHeadR = new Rectangle(0, availR.y, 0, 0); |
| 717 | |
| 718 | if ((colHead != null) && (colHead.isVisible())) { |
| 719 | int colHeadHeight = Math.min(availR.height, |
| 720 | colHead.getPreferredSize().height); |
| 721 | colHeadR.height = colHeadHeight; |
| 722 | availR.y += colHeadHeight; |
| 723 | availR.height -= colHeadHeight; |
| 724 | } |
| 725 | |
| 726 | /* If there's a visible row header remove the space it needs |
| 727 | * from the left or right of availR. The row header is treated |
| 728 | * as if it were fixed width, arbitrary height. |
| 729 | */ |
| 730 | |
| 731 | Rectangle rowHeadR = new Rectangle(0, 0, 0, 0); |
| 732 | |
| 733 | if ((rowHead != null) && (rowHead.isVisible())) { |
| 734 | int rowHeadWidth = Math.min(availR.width, |
| 735 | rowHead.getPreferredSize().width); |
| 736 | rowHeadR.width = rowHeadWidth; |
| 737 | availR.width -= rowHeadWidth; |
| 738 | if ( leftToRight ) { |
| 739 | rowHeadR.x = availR.x; |
| 740 | availR.x += rowHeadWidth; |
| 741 | } else { |
| 742 | rowHeadR.x = availR.x + availR.width; |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | /* If there's a JScrollPane.viewportBorder, remove the |
| 747 | * space it occupies for availR. |
| 748 | */ |
| 749 | |
| 750 | Border viewportBorder = scrollPane.getViewportBorder(); |
| 751 | Insets vpbInsets; |
| 752 | if (viewportBorder != null) { |
| 753 | vpbInsets = viewportBorder.getBorderInsets(parent); |
| 754 | availR.x += vpbInsets.left; |
| 755 | availR.y += vpbInsets.top; |
| 756 | availR.width -= vpbInsets.left + vpbInsets.right; |
| 757 | availR.height -= vpbInsets.top + vpbInsets.bottom; |
| 758 | } |
| 759 | else { |
| 760 | vpbInsets = new Insets(0,0,0,0); |
| 761 | } |
| 762 | |
| 763 | |
| 764 | /* At this point availR is the space available for the viewport |
| 765 | * and scrollbars. rowHeadR is correct except for its height and y |
| 766 | * and colHeadR is correct except for its width and x. Once we're |
| 767 | * through computing the dimensions of these three parts we can |
| 768 | * go back and set the dimensions of rowHeadR.height, rowHeadR.y, |
| 769 | * colHeadR.width, colHeadR.x and the bounds for the corners. |
| 770 | * |
| 771 | * We'll decide about putting up scrollbars by comparing the |
| 772 | * viewport views preferred size with the viewports extent |
| 773 | * size (generally just its size). Using the preferredSize is |
| 774 | * reasonable because layout proceeds top down - so we expect |
| 775 | * the viewport to be laid out next. And we assume that the |
| 776 | * viewports layout manager will give the view it's preferred |
| 777 | * size. One exception to this is when the view implements |
| 778 | * Scrollable and Scrollable.getViewTracksViewport{Width,Height} |
| 779 | * methods return true. If the view is tracking the viewports |
| 780 | * width we don't bother with a horizontal scrollbar, similarly |
| 781 | * if view.getViewTracksViewport(Height) is true we don't bother |
| 782 | * with a vertical scrollbar. |
| 783 | */ |
| 784 | |
| 785 | Component view = (viewport != null) ? viewport.getView() : null; |
| 786 | Dimension viewPrefSize = |
| 787 | (view != null) ? view.getPreferredSize() |
| 788 | : new Dimension(0,0); |
| 789 | |
| 790 | Dimension extentSize = |
| 791 | (viewport != null) ? viewport.toViewCoordinates(availR.getSize()) |
| 792 | : new Dimension(0,0); |
| 793 | |
| 794 | boolean viewTracksViewportWidth = false; |
| 795 | boolean viewTracksViewportHeight = false; |
| 796 | boolean isEmpty = (availR.width < 0 || availR.height < 0); |
| 797 | Scrollable sv; |
| 798 | // Don't bother checking the Scrollable methods if there is no room |
| 799 | // for the viewport, we aren't going to show any scrollbars in this |
| 800 | // case anyway. |
| 801 | if (!isEmpty && view instanceof Scrollable) { |
| 802 | sv = (Scrollable)view; |
| 803 | viewTracksViewportWidth = sv.getScrollableTracksViewportWidth(); |
| 804 | viewTracksViewportHeight = sv.getScrollableTracksViewportHeight(); |
| 805 | } |
| 806 | else { |
| 807 | sv = null; |
| 808 | } |
| 809 | |
| 810 | /* If there's a vertical scrollbar and we need one, allocate |
| 811 | * space for it (we'll make it visible later). A vertical |
| 812 | * scrollbar is considered to be fixed width, arbitrary height. |
| 813 | */ |
| 814 | |
| 815 | Rectangle vsbR = new Rectangle(0, availR.y - vpbInsets.top, 0, 0); |
| 816 | |
| 817 | boolean vsbNeeded; |
| 818 | if (isEmpty) { |
| 819 | vsbNeeded = false; |
| 820 | } |
| 821 | else if (vsbPolicy == VERTICAL_SCROLLBAR_ALWAYS) { |
| 822 | vsbNeeded = true; |
| 823 | } |
| 824 | else if (vsbPolicy == VERTICAL_SCROLLBAR_NEVER) { |
| 825 | vsbNeeded = false; |
| 826 | } |
| 827 | else { // vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED |
| 828 | vsbNeeded = !viewTracksViewportHeight && (viewPrefSize.height > extentSize.height); |
| 829 | } |
| 830 | |
| 831 | |
| 832 | if ((vsb != null) && vsbNeeded) { |
| 833 | adjustForVSB(true, availR, vsbR, vpbInsets, leftToRight); |
| 834 | extentSize = viewport.toViewCoordinates(availR.getSize()); |
| 835 | } |
| 836 | |
| 837 | /* If there's a horizontal scrollbar and we need one, allocate |
| 838 | * space for it (we'll make it visible later). A horizontal |
| 839 | * scrollbar is considered to be fixed height, arbitrary width. |
| 840 | */ |
| 841 | |
| 842 | Rectangle hsbR = new Rectangle(availR.x - vpbInsets.left, 0, 0, 0); |
| 843 | boolean hsbNeeded; |
| 844 | if (isEmpty) { |
| 845 | hsbNeeded = false; |
| 846 | } |
| 847 | else if (hsbPolicy == HORIZONTAL_SCROLLBAR_ALWAYS) { |
| 848 | hsbNeeded = true; |
| 849 | } |
| 850 | else if (hsbPolicy == HORIZONTAL_SCROLLBAR_NEVER) { |
| 851 | hsbNeeded = false; |
| 852 | } |
| 853 | else { // hsbPolicy == HORIZONTAL_SCROLLBAR_AS_NEEDED |
| 854 | hsbNeeded = !viewTracksViewportWidth && (viewPrefSize.width > extentSize.width); |
| 855 | } |
| 856 | |
| 857 | if ((hsb != null) && hsbNeeded) { |
| 858 | adjustForHSB(true, availR, hsbR, vpbInsets); |
| 859 | |
| 860 | /* If we added the horizontal scrollbar then we've implicitly |
| 861 | * reduced the vertical space available to the viewport. |
| 862 | * As a consequence we may have to add the vertical scrollbar, |
| 863 | * if that hasn't been done so already. Of course we |
| 864 | * don't bother with any of this if the vsbPolicy is NEVER. |
| 865 | */ |
| 866 | if ((vsb != null) && !vsbNeeded && |
| 867 | (vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) { |
| 868 | |
| 869 | extentSize = viewport.toViewCoordinates(availR.getSize()); |
| 870 | vsbNeeded = viewPrefSize.height > extentSize.height; |
| 871 | |
| 872 | if (vsbNeeded) { |
| 873 | adjustForVSB(true, availR, vsbR, vpbInsets, leftToRight); |
| 874 | } |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | /* Set the size of the viewport first, and then recheck the Scrollable |
| 879 | * methods. Some components base their return values for the Scrollable |
| 880 | * methods on the size of the Viewport, so that if we don't |
| 881 | * ask after resetting the bounds we may have gotten the wrong |
| 882 | * answer. |
| 883 | */ |
| 884 | |
| 885 | if (viewport != null) { |
| 886 | viewport.setBounds(availR); |
| 887 | |
| 888 | if (sv != null) { |
| 889 | extentSize = viewport.toViewCoordinates(availR.getSize()); |
| 890 | |
| 891 | boolean oldHSBNeeded = hsbNeeded; |
| 892 | boolean oldVSBNeeded = vsbNeeded; |
| 893 | viewTracksViewportWidth = sv. |
| 894 | getScrollableTracksViewportWidth(); |
| 895 | viewTracksViewportHeight = sv. |
| 896 | getScrollableTracksViewportHeight(); |
| 897 | if (vsb != null && vsbPolicy == VERTICAL_SCROLLBAR_AS_NEEDED) { |
| 898 | boolean newVSBNeeded = !viewTracksViewportHeight && |
| 899 | (viewPrefSize.height > extentSize.height); |
| 900 | if (newVSBNeeded != vsbNeeded) { |
| 901 | vsbNeeded = newVSBNeeded; |
| 902 | adjustForVSB(vsbNeeded, availR, vsbR, vpbInsets, |
| 903 | leftToRight); |
| 904 | extentSize = viewport.toViewCoordinates |
| 905 | (availR.getSize()); |
| 906 | } |
| 907 | } |
| 908 | if (hsb != null && hsbPolicy ==HORIZONTAL_SCROLLBAR_AS_NEEDED){ |
| 909 | boolean newHSBbNeeded = !viewTracksViewportWidth && |
| 910 | (viewPrefSize.width > extentSize.width); |
| 911 | if (newHSBbNeeded != hsbNeeded) { |
| 912 | hsbNeeded = newHSBbNeeded; |
| 913 | adjustForHSB(hsbNeeded, availR, hsbR, vpbInsets); |
| 914 | if ((vsb != null) && !vsbNeeded && |
| 915 | (vsbPolicy != VERTICAL_SCROLLBAR_NEVER)) { |
| 916 | |
| 917 | extentSize = viewport.toViewCoordinates |
| 918 | (availR.getSize()); |
| 919 | vsbNeeded = viewPrefSize.height > |
| 920 | extentSize.height; |
| 921 | |
| 922 | if (vsbNeeded) { |
| 923 | adjustForVSB(true, availR, vsbR, vpbInsets, |
| 924 | leftToRight); |
| 925 | } |
| 926 | } |
| 927 | } |
| 928 | } |
| 929 | if (oldHSBNeeded != hsbNeeded || |
| 930 | oldVSBNeeded != vsbNeeded) { |
| 931 | viewport.setBounds(availR); |
| 932 | // You could argue that we should recheck the |
| 933 | // Scrollable methods again until they stop changing, |
| 934 | // but they might never stop changing, so we stop here |
| 935 | // and don't do any additional checks. |
| 936 | } |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | /* We now have the final size of the viewport: availR. |
| 941 | * Now fixup the header and scrollbar widths/heights. |
| 942 | */ |
| 943 | vsbR.height = availR.height + vpbInsets.top + vpbInsets.bottom; |
| 944 | hsbR.width = availR.width + vpbInsets.left + vpbInsets.right; |
| 945 | rowHeadR.height = availR.height + vpbInsets.top + vpbInsets.bottom; |
| 946 | rowHeadR.y = availR.y - vpbInsets.top; |
| 947 | colHeadR.width = availR.width + vpbInsets.left + vpbInsets.right; |
| 948 | colHeadR.x = availR.x - vpbInsets.left; |
| 949 | |
| 950 | /* Set the bounds of the remaining components. The scrollbars |
| 951 | * are made invisible if they're not needed. |
| 952 | */ |
| 953 | |
| 954 | if (rowHead != null) { |
| 955 | rowHead.setBounds(rowHeadR); |
| 956 | } |
| 957 | |
| 958 | if (colHead != null) { |
| 959 | colHead.setBounds(colHeadR); |
| 960 | } |
| 961 | |
| 962 | if (vsb != null) { |
| 963 | if (vsbNeeded) { |
| 964 | if (colHead != null && |
| 965 | UIManager.getBoolean("ScrollPane.fillUpperCorner")) |
| 966 | { |
| 967 | if ((leftToRight && upperRight == null) || |
| 968 | (!leftToRight && upperLeft == null)) |
| 969 | { |
| 970 | // This is used primarily for GTK L&F, which needs to |
| 971 | // extend the vertical scrollbar to fill the upper |
| 972 | // corner near the column header. Note that we skip |
| 973 | // this step (and use the default behavior) if the |
| 974 | // user has set a custom corner component. |
| 975 | vsbR.y = colHeadR.y; |
| 976 | vsbR.height += colHeadR.height; |
| 977 | } |
| 978 | } |
| 979 | vsb.setVisible(true); |
| 980 | vsb.setBounds(vsbR); |
| 981 | } |
| 982 | else { |
| 983 | vsb.setVisible(false); |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | if (hsb != null) { |
| 988 | if (hsbNeeded) { |
| 989 | if (rowHead != null && |
| 990 | UIManager.getBoolean("ScrollPane.fillLowerCorner")) |
| 991 | { |
| 992 | if ((leftToRight && lowerLeft == null) || |
| 993 | (!leftToRight && lowerRight == null)) |
| 994 | { |
| 995 | // This is used primarily for GTK L&F, which needs to |
| 996 | // extend the horizontal scrollbar to fill the lower |
| 997 | // corner near the row header. Note that we skip |
| 998 | // this step (and use the default behavior) if the |
| 999 | // user has set a custom corner component. |
| 1000 | if (leftToRight) { |
| 1001 | hsbR.x = rowHeadR.x; |
| 1002 | } |
| 1003 | hsbR.width += rowHeadR.width; |
| 1004 | } |
| 1005 | } |
| 1006 | hsb.setVisible(true); |
| 1007 | hsb.setBounds(hsbR); |
| 1008 | } |
| 1009 | else { |
| 1010 | hsb.setVisible(false); |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | if (lowerLeft != null) { |
| 1015 | lowerLeft.setBounds(leftToRight ? rowHeadR.x : vsbR.x, |
| 1016 | hsbR.y, |
| 1017 | leftToRight ? rowHeadR.width : vsbR.width, |
| 1018 | hsbR.height); |
| 1019 | } |
| 1020 | |
| 1021 | if (lowerRight != null) { |
| 1022 | lowerRight.setBounds(leftToRight ? vsbR.x : rowHeadR.x, |
| 1023 | hsbR.y, |
| 1024 | leftToRight ? vsbR.width : rowHeadR.width, |
| 1025 | hsbR.height); |
| 1026 | } |
| 1027 | |
| 1028 | if (upperLeft != null) { |
| 1029 | upperLeft.setBounds(leftToRight ? rowHeadR.x : vsbR.x, |
| 1030 | colHeadR.y, |
| 1031 | leftToRight ? rowHeadR.width : vsbR.width, |
| 1032 | colHeadR.height); |
| 1033 | } |
| 1034 | |
| 1035 | if (upperRight != null) { |
| 1036 | upperRight.setBounds(leftToRight ? vsbR.x : rowHeadR.x, |
| 1037 | colHeadR.y, |
| 1038 | leftToRight ? vsbR.width : rowHeadR.width, |
| 1039 | colHeadR.height); |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | /** |
| 1044 | * Adjusts the <code>Rectangle</code> <code>available</code> based on if |
| 1045 | * the vertical scrollbar is needed (<code>wantsVSB</code>). |
| 1046 | * The location of the vsb is updated in <code>vsbR</code>, and |
| 1047 | * the viewport border insets (<code>vpbInsets</code>) are used to offset |
| 1048 | * the vsb. This is only called when <code>wantsVSB</code> has |
| 1049 | * changed, eg you shouldn't invoke adjustForVSB(true) twice. |
| 1050 | */ |
| 1051 | private void adjustForVSB(boolean wantsVSB, Rectangle available, |
| 1052 | Rectangle vsbR, Insets vpbInsets, |
| 1053 | boolean leftToRight) { |
| 1054 | int oldWidth = vsbR.width; |
| 1055 | if (wantsVSB) { |
| 1056 | int vsbWidth = Math.max(0, Math.min(vsb.getPreferredSize().width, |
| 1057 | available.width)); |
| 1058 | |
| 1059 | available.width -= vsbWidth; |
| 1060 | vsbR.width = vsbWidth; |
| 1061 | |
| 1062 | if( leftToRight ) { |
| 1063 | vsbR.x = available.x + available.width + vpbInsets.right; |
| 1064 | } else { |
| 1065 | vsbR.x = available.x - vpbInsets.left; |
| 1066 | available.x += vsbWidth; |
| 1067 | } |
| 1068 | } |
| 1069 | else { |
| 1070 | available.width += oldWidth; |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | /** |
| 1075 | * Adjusts the <code>Rectangle</code> <code>available</code> based on if |
| 1076 | * the horizontal scrollbar is needed (<code>wantsHSB</code>). |
| 1077 | * The location of the hsb is updated in <code>hsbR</code>, and |
| 1078 | * the viewport border insets (<code>vpbInsets</code>) are used to offset |
| 1079 | * the hsb. This is only called when <code>wantsHSB</code> has |
| 1080 | * changed, eg you shouldn't invoked adjustForHSB(true) twice. |
| 1081 | */ |
| 1082 | private void adjustForHSB(boolean wantsHSB, Rectangle available, |
| 1083 | Rectangle hsbR, Insets vpbInsets) { |
| 1084 | int oldHeight = hsbR.height; |
| 1085 | if (wantsHSB) { |
| 1086 | int hsbHeight = Math.max(0, Math.min(available.height, |
| 1087 | hsb.getPreferredSize().height)); |
| 1088 | |
| 1089 | available.height -= hsbHeight; |
| 1090 | hsbR.y = available.y + available.height + vpbInsets.bottom; |
| 1091 | hsbR.height = hsbHeight; |
| 1092 | } |
| 1093 | else { |
| 1094 | available.height += oldHeight; |
| 1095 | } |
| 1096 | } |
| 1097 | |
| 1098 | |
| 1099 | |
| 1100 | /** |
| 1101 | * Returns the bounds of the border around the specified scroll pane's |
| 1102 | * viewport. |
| 1103 | * |
| 1104 | * @return the size and position of the viewport border |
| 1105 | * @deprecated As of JDK version Swing1.1 |
| 1106 | * replaced by <code>JScrollPane.getViewportBorderBounds()</code>. |
| 1107 | */ |
| 1108 | @Deprecated |
| 1109 | public Rectangle getViewportBorderBounds(JScrollPane scrollpane) { |
| 1110 | return scrollpane.getViewportBorderBounds(); |
| 1111 | } |
| 1112 | |
| 1113 | /** |
| 1114 | * The UI resource version of <code>ScrollPaneLayout</code>. |
| 1115 | */ |
| 1116 | public static class UIResource extends ScrollPaneLayout implements javax.swing.plaf.UIResource {} |
| 1117 | } |