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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 2007, 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 javax.swing; | ||
| 28 | |||
| 29 | import java.awt.*; | ||
| 30 | import java.beans.ConstructorProperties; | ||
| 31 | import java.io.Serializable; | ||
| 32 | import java.io.PrintStream; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * A layout manager that allows multiple components to be laid out either | ||
| 36 | * vertically or horizontally. The components will not wrap so, for | ||
| 37 | * example, a vertical arrangement of components will stay vertically | ||
| 38 | * arranged when the frame is resized. | ||
| 39 | * <TABLE ALIGN="RIGHT" BORDER="0" SUMMARY="layout"> | ||
| 40 | * <TR> | ||
| 41 | * <TD ALIGN="CENTER"> | ||
| 42 | * <P ALIGN="CENTER"><IMG SRC="doc-files/BoxLayout-1.gif" | ||
| 43 | * alt="The following text describes this graphic." | ||
| 44 | * WIDTH="191" HEIGHT="201" ALIGN="BOTTOM" BORDER="0"> | ||
| 45 | * </TD> | ||
| 46 | * </TR> | ||
| 47 | * </TABLE> | ||
| 48 | * <p> | ||
| 49 | * Nesting multiple panels with different combinations of horizontal and | ||
| 50 | * vertical gives an effect similar to GridBagLayout, without the | ||
| 51 | * complexity. The diagram shows two panels arranged horizontally, each | ||
| 52 | * of which contains 3 components arranged vertically. | ||
| 53 | * | ||
| 54 | * <p> The BoxLayout manager is constructed with an axis parameter that | ||
| 55 | * specifies the type of layout that will be done. There are four choices: | ||
| 56 | * | ||
| 57 | * <blockquote><b><tt>X_AXIS</tt></b> - Components are laid out horizontally | ||
| 58 | * from left to right.</blockquote> | ||
| 59 | * | ||
| 60 | * <blockquote><b><tt>Y_AXIS</tt></b> - Components are laid out vertically | ||
| 61 | * from top to bottom.</blockquote> | ||
| 62 | * | ||
| 63 | * <blockquote><b><tt>LINE_AXIS</tt></b> - Components are laid out the way | ||
| 64 | * words are laid out in a line, based on the container's | ||
| 65 | * <tt>ComponentOrientation</tt> property. If the container's | ||
| 66 | * <tt>ComponentOrientation</tt> is horizontal then components are laid out | ||
| 67 | * horizontally, otherwise they are laid out vertically. For horizontal | ||
| 68 | * orientations, if the container's <tt>ComponentOrientation</tt> is left to | ||
| 69 | * right then components are laid out left to right, otherwise they are laid | ||
| 70 | * out right to left. For vertical orientations components are always laid out | ||
| 71 | * from top to bottom.</blockquote> | ||
| 72 | * | ||
| 73 | * <blockquote><b><tt>PAGE_AXIS</tt></b> - Components are laid out the way | ||
| 74 | * text lines are laid out on a page, based on the container's | ||
| 75 | * <tt>ComponentOrientation</tt> property. If the container's | ||
| 76 | * <tt>ComponentOrientation</tt> is horizontal then components are laid out | ||
| 77 | * vertically, otherwise they are laid out horizontally. For horizontal | ||
| 78 | * orientations, if the container's <tt>ComponentOrientation</tt> is left to | ||
| 79 | * right then components are laid out left to right, otherwise they are laid | ||
| 80 | * out right to left. For vertical orientations components are always | ||
| 81 | * laid out from top to bottom.</blockquote> | ||
| 82 | * <p> | ||
| 83 | * For all directions, components are arranged in the same order as they were | ||
| 84 | * added to the container. | ||
| 85 | * <p> | ||
| 86 | * BoxLayout attempts to arrange components | ||
| 87 | * at their preferred widths (for horizontal layout) | ||
| 88 | * or heights (for vertical layout). | ||
| 89 | * For a horizontal layout, | ||
| 90 | * if not all the components are the same height, | ||
| 91 | * BoxLayout attempts to make all the components | ||
| 92 | * as high as the highest component. | ||
| 93 | * If that's not possible for a particular component, | ||
| 94 | * then BoxLayout aligns that component vertically, | ||
| 95 | * according to the component's Y alignment. | ||
| 96 | * By default, a component has a Y alignment of 0.5, | ||
| 97 | * which means that the vertical center of the component | ||
| 98 | * should have the same Y coordinate as | ||
| 99 | * the vertical centers of other components with 0.5 Y alignment. | ||
| 100 | * <p> | ||
| 101 | * Similarly, for a vertical layout, | ||
| 102 | * BoxLayout attempts to make all components in the column | ||
| 103 | * as wide as the widest component. | ||
| 104 | * If that fails, it aligns them horizontally | ||
| 105 | * according to their X alignments. For <code>PAGE_AXIS</code> layout, | ||
| 106 | * horizontal alignment is done based on the leading edge of the component. | ||
| 107 | * In other words, an X alignment value of 0.0 means the left edge of a | ||
| 108 | * component if the container's <code>ComponentOrientation</code> is left to | ||
| 109 | * right and it means the right edge of the component otherwise. | ||
| 110 | * <p> | ||
| 111 | * Instead of using BoxLayout directly, many programs use the Box class. | ||
| 112 | * The Box class is a lightweight container that uses a BoxLayout. | ||
| 113 | * It also provides handy methods to help you use BoxLayout well. | ||
| 114 | * Adding components to multiple nested boxes is a powerful way to get | ||
| 115 | * the arrangement you want. | ||
| 116 | * <p> | ||
| 117 | * For further information and examples see | ||
| 118 | * <a | ||
| 119 | href="http://java.sun.com/docs/books/tutorial/uiswing/layout/box.html">How to Use BoxLayout</a>, | ||
| 120 | * a section in <em>The Java Tutorial.</em> | ||
| 121 | * <p> | ||
| 122 | * <strong>Warning:</strong> | ||
| 123 | * Serialized objects of this class will not be compatible with | ||
| 124 | * future Swing releases. The current serialization support is | ||
| 125 | * appropriate for short term storage or RMI between applications running | ||
| 126 | * the same version of Swing. As of 1.4, support for long term storage | ||
| 127 | * of all JavaBeans<sup><font size="-2">TM</font></sup> | ||
| 128 | * has been added to the <code>java.beans</code> package. | ||
| 129 | * Please see {@link java.beans.XMLEncoder}. | ||
| 130 | * | ||
| 131 | * @see Box | ||
| 132 | * @see java.awt.ComponentOrientation | ||
| 133 | * @see JComponent#getAlignmentX | ||
| 134 | * @see JComponent#getAlignmentY | ||
| 135 | * | ||
| 136 | * @author Timothy Prinzing | ||
| 137 | */ | ||
| 138 | public class BoxLayout implements LayoutManager2, Serializable { | ||
| 139 | |||
| 140 | /** | ||
| 141 | * Specifies that components should be laid out left to right. | ||
| 142 | */ | ||
| 143 | public static final int X_AXIS = 0; | ||
| 144 | |||
| 145 | /** | ||
| 146 | * Specifies that components should be laid out top to bottom. | ||
| 147 | */ | ||
| 148 | public static final int Y_AXIS = 1; | ||
| 149 | |||
| 150 | /** | ||
| 151 | * Specifies that components should be laid out in the direction of | ||
| 152 | * a line of text as determined by the target container's | ||
| 153 | * <code>ComponentOrientation</code> property. | ||
| 154 | */ | ||
| 155 | public static final int LINE_AXIS = 2; | ||
| 156 | |||
| 157 | /** | ||
| 158 | * Specifies that components should be laid out in the direction that | ||
| 159 | * lines flow across a page as determined by the target container's | ||
| 160 | * <code>ComponentOrientation</code> property. | ||
| 161 | */ | ||
| 162 | public static final int PAGE_AXIS = 3; | ||
| 163 | |||
| 164 | /** | ||
| 165 | * Creates a layout manager that will lay out components along the | ||
| 166 | * given axis. | ||
| 167 | * | ||
| 168 | * @param target the container that needs to be laid out | ||
| 169 | * @param axis the axis to lay out components along. Can be one of: | ||
| 170 | * <code>BoxLayout.X_AXIS</code>, | ||
| 171 | * <code>BoxLayout.Y_AXIS</code>, | ||
| 172 | * <code>BoxLayout.LINE_AXIS</code> or | ||
| 173 | * <code>BoxLayout.PAGE_AXIS</code> | ||
| 174 | * | ||
| 175 | * @exception AWTError if the value of <code>axis</code> is invalid | ||
| 176 | */ | ||
| 177 | @ConstructorProperties({"target", "axis"}) | ||
| 178 | public BoxLayout(Container target, int axis) { | ||
| 179 | if (axis != X_AXIS && axis != Y_AXIS && | ||
| 180 | axis != LINE_AXIS && axis != PAGE_AXIS) { | ||
| 181 | throw new AWTError("Invalid axis"); | ||
| 182 | } | ||
| 183 | this.axis = axis; | ||
| 184 | this.target = target; | ||
| 185 | } | ||
| 186 | |||
| 187 | /** | ||
| 188 | * Constructs a BoxLayout that | ||
| 189 | * produces debugging messages. | ||
| 190 | * | ||
| 191 | * @param target the container that needs to be laid out | ||
| 192 | * @param axis the axis to lay out components along. Can be one of: | ||
| 193 | * <code>BoxLayout.X_AXIS</code>, | ||
| 194 | * <code>BoxLayout.Y_AXIS</code>, | ||
| 195 | * <code>BoxLayout.LINE_AXIS</code> or | ||
| 196 | * <code>BoxLayout.PAGE_AXIS</code> | ||
| 197 | * | ||
| 198 | * @param dbg the stream to which debugging messages should be sent, | ||
| 199 | * null if none | ||
| 200 | */ | ||
| 201 | BoxLayout(Container target, int axis, PrintStream dbg) { | ||
| 202 | this(target, axis); | ||
| 203 | this.dbg = dbg; | ||
| 204 | } | ||
| 205 | |||
| 206 | /** | ||
| 207 | * Returns the container that uses this layout manager. | ||
| 208 | * | ||
| 209 | * @return the container that uses this layout manager | ||
| 210 | * | ||
| 211 | * @since 1.6 | ||
| 212 | */ | ||
| 213 | public final Container getTarget() { | ||
| 214 | return this.target; | ||
| 215 | } | ||
| 216 | |||
| 217 | /** | ||
| 218 | * Returns the axis that was used to lay out components. | ||
| 219 | * Returns one of: | ||
| 220 | * <code>BoxLayout.X_AXIS</code>, | ||
| 221 | * <code>BoxLayout.Y_AXIS</code>, | ||
| 222 | * <code>BoxLayout.LINE_AXIS</code> or | ||
| 223 | * <code>BoxLayout.PAGE_AXIS</code> | ||
| 224 | * | ||
| 225 | * @return the axis that was used to lay out components | ||
| 226 | * | ||
| 227 | * @since 1.6 | ||
| 228 | */ | ||
| 229 | public final int getAxis() { | ||
| 230 | return this.axis; | ||
| 231 | } | ||
| 232 | |||
| 233 | /** | ||
| 234 | * Indicates that a child has changed its layout related information, | ||
| 235 | * and thus any cached calculations should be flushed. | ||
| 236 | * <p> | ||
| 237 | * This method is called by AWT when the invalidate method is called | ||
| 238 | * on the Container. Since the invalidate method may be called | ||
| 239 | * asynchronously to the event thread, this method may be called | ||
| 240 | * asynchronously. | ||
| 241 | * | ||
| 242 | * @param target the affected container | ||
| 243 | * | ||
| 244 | * @exception AWTError if the target isn't the container specified to the | ||
| 245 | * BoxLayout constructor | ||
| 246 | */ | ||
| 247 | public synchronized void invalidateLayout(Container target) { | ||
| 248 | checkContainer(target); | ||
| 249 | xChildren = null; | ||
| 250 | yChildren = null; | ||
| 251 | xTotal = null; | ||
| 252 | yTotal = null; | ||
| 253 | } | ||
| 254 | |||
| 255 | /** | ||
| 256 | * Not used by this class. | ||
| 257 | * | ||
| 258 | * @param name the name of the component | ||
| 259 | * @param comp the component | ||
| 260 | */ | ||
| 261 | public void addLayoutComponent(String name, Component comp) { | ||
| 262 | invalidateLayout(comp.getParent()); | ||
| 263 | } | ||
| 264 | |||
| 265 | /** | ||
| 266 | * Not used by this class. | ||
| 267 | * | ||
| 268 | * @param comp the component | ||
| 269 | */ | ||
| 270 | public void removeLayoutComponent(Component comp) { | ||
| 271 | invalidateLayout(comp.getParent()); | ||
| 272 | } | ||
| 273 | |||
| 274 | /** | ||
| 275 | * Not used by this class. | ||
| 276 | * | ||
| 277 | * @param comp the component | ||
| 278 | * @param constraints constraints | ||
| 279 | */ | ||
| 280 | public void addLayoutComponent(Component comp, Object constraints) { | ||
| 281 | invalidateLayout(comp.getParent()); | ||
| 282 | } | ||
| 283 | |||
| 284 | /** | ||
| 285 | * Returns the preferred dimensions for this layout, given the components | ||
| 286 | * in the specified target container. | ||
| 287 | * | ||
| 288 | * @param target the container that needs to be laid out | ||
| 289 | * @return the dimensions >= 0 && <= Integer.MAX_VALUE | ||
| 290 | * @exception AWTError if the target isn't the container specified to the | ||
| 291 | * BoxLayout constructor | ||
| 292 | * @see Container | ||
| 293 | * @see #minimumLayoutSize | ||
| 294 | * @see #maximumLayoutSize | ||
| 295 | */ | ||
| 296 | public Dimension preferredLayoutSize(Container target) { | ||
| 297 | Dimension size; | ||
| 298 | synchronized(this) { | ||
| 299 | checkContainer(target); | ||
| 300 | checkRequests(); | ||
| 301 | size = new Dimension(xTotal.preferred, yTotal.preferred); | ||
| 302 | } | ||
| 303 | |||
| 304 | Insets insets = target.getInsets(); | ||
| 305 | size.width = (int) Math.min((long) size.width + (long) insets.left + (long) insets.right, Integer.MAX_VALUE); | ||
| 306 | size.height = (int) Math.min((long) size.height + (long) insets.top + (long) insets.bottom, Integer.MAX_VALUE); | ||
| 307 | return size; | ||
| 308 | } | ||
| 309 | |||
| 310 | /** | ||
| 311 | * Returns the minimum dimensions needed to lay out the components | ||
| 312 | * contained in the specified target container. | ||
| 313 | * | ||
| 314 | * @param target the container that needs to be laid out | ||
| 315 | * @return the dimensions >= 0 && <= Integer.MAX_VALUE | ||
| 316 | * @exception AWTError if the target isn't the container specified to the | ||
| 317 | * BoxLayout constructor | ||
| 318 | * @see #preferredLayoutSize | ||
| 319 | * @see #maximumLayoutSize | ||
| 320 | */ | ||
| 321 | public Dimension minimumLayoutSize(Container target) { | ||
| 322 | Dimension size; | ||
| 323 | synchronized(this) { | ||
| 324 | checkContainer(target); | ||
| 325 | checkRequests(); | ||
| 326 | size = new Dimension(xTotal.minimum, yTotal.minimum); | ||
| 327 | } | ||
| 328 | |||
| 329 | Insets insets = target.getInsets(); | ||
| 330 | size.width = (int) Math.min((long) size.width + (long) insets.left + (long) insets.right, Integer.MAX_VALUE); | ||
| 331 | size.height = (int) Math.min((long) size.height + (long) insets.top + (long) insets.bottom, Integer.MAX_VALUE); | ||
| 332 | return size; | ||
| 333 | } | ||
| 334 | |||
| 335 | /** | ||
| 336 | * Returns the maximum dimensions the target container can use | ||
| 337 | * to lay out the components it contains. | ||
| 338 | * | ||
| 339 | * @param target the container that needs to be laid out | ||
| 340 | * @return the dimenions >= 0 && <= Integer.MAX_VALUE | ||
| 341 | * @exception AWTError if the target isn't the container specified to the | ||
| 342 | * BoxLayout constructor | ||
| 343 | * @see #preferredLayoutSize | ||
| 344 | * @see #minimumLayoutSize | ||
| 345 | */ | ||
| 346 | public Dimension maximumLayoutSize(Container target) { | ||
| 347 | Dimension size; | ||
| 348 | synchronized(this) { | ||
| 349 | checkContainer(target); | ||
| 350 | checkRequests(); | ||
| 351 | size = new Dimension(xTotal.maximum, yTotal.maximum); | ||
| 352 | } | ||
| 353 | |||
| 354 | Insets insets = target.getInsets(); | ||
| 355 | size.width = (int) Math.min((long) size.width + (long) insets.left + (long) insets.right, Integer.MAX_VALUE); | ||
| 356 | size.height = (int) Math.min((long) size.height + (long) insets.top + (long) insets.bottom, Integer.MAX_VALUE); | ||
| 357 | return size; | ||
| 358 | } | ||
| 359 | |||
| 360 | /** | ||
| 361 | * Returns the alignment along the X axis for the container. | ||
| 362 | * If the box is horizontal, the default | ||
| 363 | * alignment will be returned. Otherwise, the alignment needed | ||
| 364 | * to place the children along the X axis will be returned. | ||
| 365 | * | ||
| 366 | * @param target the container | ||
| 367 | * @return the alignment >= 0.0f && <= 1.0f | ||
| 368 | * @exception AWTError if the target isn't the container specified to the | ||
| 369 | * BoxLayout constructor | ||
| 370 | */ | ||
| 371 | public synchronized float getLayoutAlignmentX(Container target) { | ||
| 372 | checkContainer(target); | ||
| 373 | checkRequests(); | ||
| 374 | return xTotal.alignment; | ||
| 375 | } | ||
| 376 | |||
| 377 | /** | ||
| 378 | * Returns the alignment along the Y axis for the container. | ||
| 379 | * If the box is vertical, the default | ||
| 380 | * alignment will be returned. Otherwise, the alignment needed | ||
| 381 | * to place the children along the Y axis will be returned. | ||
| 382 | * | ||
| 383 | * @param target the container | ||
| 384 | * @return the alignment >= 0.0f && <= 1.0f | ||
| 385 | * @exception AWTError if the target isn't the container specified to the | ||
| 386 | * BoxLayout constructor | ||
| 387 | */ | ||
| 388 | public synchronized float getLayoutAlignmentY(Container target) { | ||
| 389 | checkContainer(target); | ||
| 390 | checkRequests(); | ||
| 391 | return yTotal.alignment; | ||
| 392 | } | ||
| 393 | |||
| 394 | /** | ||
| 395 | * Called by the AWT <!-- XXX CHECK! --> when the specified container | ||
| 396 | * needs to be laid out. | ||
| 397 | * | ||
| 398 | * @param target the container to lay out | ||
| 399 | * | ||
| 400 | * @exception AWTError if the target isn't the container specified to the | ||
| 401 | * BoxLayout constructor | ||
| 402 | */ | ||
| 403 | public void layoutContainer(Container target) { | ||
| 404 | checkContainer(target); | ||
| 405 | int nChildren = target.getComponentCount(); | ||
| 406 | int[] xOffsets = new int[nChildren]; | ||
| 407 | int[] xSpans = new int[nChildren]; | ||
| 408 | int[] yOffsets = new int[nChildren]; | ||
| 409 | int[] ySpans = new int[nChildren]; | ||
| 410 | |||
| 411 | Dimension alloc = target.getSize(); | ||
| 412 | Insets in = target.getInsets(); | ||
| 413 | alloc.width -= in.left + in.right; | ||
| 414 | alloc.height -= in.top + in.bottom; | ||
| 415 | |||
| 416 | // Resolve axis to an absolute value (either X_AXIS or Y_AXIS) | ||
| 417 | ComponentOrientation o = target.getComponentOrientation(); | ||
| 418 | int absoluteAxis = resolveAxis( axis, o ); | ||
| 419 | boolean ltr = (absoluteAxis != axis) ? o.isLeftToRight() : true; | ||
| 420 | |||
| 421 | |||
| 422 | // determine the child placements | ||
| 423 | synchronized(this) { | ||
| 424 | checkRequests(); | ||
| 425 | |||
| 426 | if (absoluteAxis == X_AXIS) { | ||
| 427 | SizeRequirements.calculateTiledPositions(alloc.width, xTotal, | ||
| 428 | xChildren, xOffsets, | ||
| 429 | xSpans, ltr); | ||
| 430 | SizeRequirements.calculateAlignedPositions(alloc.height, yTotal, | ||
| 431 | yChildren, yOffsets, | ||
| 432 | ySpans); | ||
| 433 | } else { | ||
| 434 | SizeRequirements.calculateAlignedPositions(alloc.width, xTotal, | ||
| 435 | xChildren, xOffsets, | ||
| 436 | xSpans, ltr); | ||
| 437 | SizeRequirements.calculateTiledPositions(alloc.height, yTotal, | ||
| 438 | yChildren, yOffsets, | ||
| 439 | ySpans); | ||
| 440 | } | ||
| 441 | } | ||
| 442 | |||
| 443 | // flush changes to the container | ||
| 444 | for (int i = 0; i < nChildren; i++) { | ||
| 445 | Component c = target.getComponent(i); | ||
| 446 | c.setBounds((int) Math.min((long) in.left + (long) xOffsets[i], Integer.MAX_VALUE), | ||
| 447 | (int) Math.min((long) in.top + (long) yOffsets[i], Integer.MAX_VALUE), | ||
| 448 | xSpans[i], ySpans[i]); | ||
| 449 | |||
| 450 | } | ||
| 451 | if (dbg != null) { | ||
| 452 | for (int i = 0; i < nChildren; i++) { | ||
| 453 | Component c = target.getComponent(i); | ||
| 454 | dbg.println(c.toString()); | ||
| 455 | dbg.println("X: " + xChildren[i]); | ||
| 456 | dbg.println("Y: " + yChildren[i]); | ||
| 457 | } | ||
| 458 | } | ||
| 459 | |||
| 460 | } | ||
| 461 | |||
| 462 | void checkContainer(Container target) { | ||
| 463 | if (this.target != target) { | ||
| 464 | throw new AWTError("BoxLayout can't be shared"); | ||
| 465 | } | ||
| 466 | } | ||
| 467 | |||
| 468 | void checkRequests() { | ||
| 469 | if (xChildren == null || yChildren == null) { | ||
| 470 | // The requests have been invalidated... recalculate | ||
| 471 | // the request information. | ||
| 472 | int n = target.getComponentCount(); | ||
| 473 | xChildren = new SizeRequirements[n]; | ||
| 474 | yChildren = new SizeRequirements[n]; | ||
| 475 | for (int i = 0; i < n; i++) { | ||
| 476 | Component c = target.getComponent(i); | ||
| 477 | if (!c.isVisible()) { | ||
| 478 | xChildren[i] = new SizeRequirements(0,0,0, c.getAlignmentX()); | ||
| 479 | yChildren[i] = new SizeRequirements(0,0,0, c.getAlignmentY()); | ||
| 480 | continue; | ||
| 481 | } | ||
| 482 | Dimension min = c.getMinimumSize(); | ||
| 483 | Dimension typ = c.getPreferredSize(); | ||
| 484 | Dimension max = c.getMaximumSize(); | ||
| 485 | xChildren[i] = new SizeRequirements(min.width, typ.width, | ||
| 486 | max.width, | ||
| 487 | c.getAlignmentX()); | ||
| 488 | yChildren[i] = new SizeRequirements(min.height, typ.height, | ||
| 489 | max.height, | ||
| 490 | c.getAlignmentY()); | ||
| 491 | } | ||
| 492 | |||
| 493 | // Resolve axis to an absolute value (either X_AXIS or Y_AXIS) | ||
| 494 | int absoluteAxis = resolveAxis(axis,target.getComponentOrientation()); | ||
| 495 | |||
| 496 | if (absoluteAxis == X_AXIS) { | ||
| 497 | xTotal = SizeRequirements.getTiledSizeRequirements(xChildren); | ||
| 498 | yTotal = SizeRequirements.getAlignedSizeRequirements(yChildren); | ||
| 499 | } else { | ||
| 500 | xTotal = SizeRequirements.getAlignedSizeRequirements(xChildren); | ||
| 501 | yTotal = SizeRequirements.getTiledSizeRequirements(yChildren); | ||
| 502 | } | ||
| 503 | } | ||
| 504 | } | ||
| 505 | |||
| 506 | /** | ||
| 507 | * Given one of the 4 axis values, resolve it to an absolute axis. | ||
| 508 | * The relative axis values, PAGE_AXIS and LINE_AXIS are converted | ||
| 509 | * to their absolute couterpart given the target's ComponentOrientation | ||
| 510 | * value. The absolute axes, X_AXIS and Y_AXIS are returned unmodified. | ||
| 511 | * | ||
| 512 | * @param axis the axis to resolve | ||
| 513 | * @param o the ComponentOrientation to resolve against | ||
| 514 | * @return the resolved axis | ||
| 515 | */ | ||
| 516 | private int resolveAxis( int axis, ComponentOrientation o ) { | ||
| 517 | int absoluteAxis; | ||
| 518 | if( axis == LINE_AXIS ) { | ||
| 519 | absoluteAxis = o.isHorizontal() ? X_AXIS : Y_AXIS; | ||
| 520 | } else if( axis == PAGE_AXIS ) { | ||
| 521 | absoluteAxis = o.isHorizontal() ? Y_AXIS : X_AXIS; | ||
| 522 | } else { | ||
| 523 | absoluteAxis = axis; | ||
| 524 | } | ||
| 525 | return absoluteAxis; | ||
| 526 | } | ||
| 527 | |||
| 528 | |||
| 529 | private int axis; | ||
| 530 | private Container target; | ||
| 531 | |||
| 532 | private transient SizeRequirements[] xChildren; | ||
| 533 | private transient SizeRequirements[] yChildren; | ||
| 534 | private transient SizeRequirements xTotal; | ||
| 535 | private transient SizeRequirements yTotal; | ||
| 536 | |||
| 537 | private transient PrintStream dbg; | ||
| 538 | } | ||