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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 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 | +package java.awt; | |
| 26 | + | |
| 27 | +import java.io.ObjectStreamException; | |
| 28 | + | |
| 29 | +/** | |
| 30 | + * A class to encapsulate symbolic colors representing the color of | |
| 31 | + * native GUI objects on a system. For systems which support the dynamic | |
| 32 | + * update of the system colors (when the user changes the colors) | |
| 33 | + * the actual RGB values of these symbolic colors will also change | |
| 34 | + * dynamically. In order to compare the "current" RGB value of a | |
| 35 | + * <code>SystemColor</code> object with a non-symbolic Color object, | |
| 36 | + * <code>getRGB</code> should be used rather than <code>equals</code>. | |
| 37 | + * <p> | |
| 38 | + * Note that the way in which these system colors are applied to GUI objects | |
| 39 | + * may vary slightly from platform to platform since GUI objects may be | |
| 40 | + * rendered differently on each platform. | |
| 41 | + * <p> | |
| 42 | + * System color values may also be available through the <code>getDesktopProperty</code> | |
| 43 | + * method on <code>java.awt.Toolkit</code>. | |
| 44 | + * | |
| 45 | + * @see Toolkit#getDesktopProperty | |
| 46 | + * | |
| 47 | + * @author Carl Quinn | |
| 48 | + * @author Amy Fowler | |
| 49 | + */ | |
| 50 | +public final class SystemColor extends Color implements java.io.Serializable { | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * The array index for the | |
| 54 | + * {@link #desktop} system color. | |
| 55 | + * @see SystemColor#desktop | |
| 56 | + */ | |
| 57 | + public final static int DESKTOP = 0; | |
| 58 | + | |
| 59 | + /** | |
| 60 | + * The array index for the | |
| 61 | + * {@link #activeCaption} system color. | |
| 62 | + * @see SystemColor#activeCaption | |
| 63 | + */ | |
| 64 | + public final static int ACTIVE_CAPTION = 1; | |
| 65 | + | |
| 66 | + /** | |
| 67 | + * The array index for the | |
| 68 | + * {@link #activeCaptionText} system color. | |
| 69 | + * @see SystemColor#activeCaptionText | |
| 70 | + */ | |
| 71 | + public final static int ACTIVE_CAPTION_TEXT = 2; | |
| 72 | + | |
| 73 | + /** | |
| 74 | + * The array index for the | |
| 75 | + * {@link #activeCaptionBorder} system color. | |
| 76 | + * @see SystemColor#activeCaptionBorder | |
| 77 | + */ | |
| 78 | + public final static int ACTIVE_CAPTION_BORDER = 3; | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * The array index for the | |
| 82 | + * {@link #inactiveCaption} system color. | |
| 83 | + * @see SystemColor#inactiveCaption | |
| 84 | + */ | |
| 85 | + public final static int INACTIVE_CAPTION = 4; | |
| 86 | + | |
| 87 | + /** | |
| 88 | + * The array index for the | |
| 89 | + * {@link #inactiveCaptionText} system color. | |
| 90 | + * @see SystemColor#inactiveCaptionText | |
| 91 | + */ | |
| 92 | + public final static int INACTIVE_CAPTION_TEXT = 5; | |
| 93 | + | |
| 94 | + /** | |
| 95 | + * The array index for the | |
| 96 | + * {@link #inactiveCaptionBorder} system color. | |
| 97 | + * @see SystemColor#inactiveCaptionBorder | |
| 98 | + */ | |
| 99 | + public final static int INACTIVE_CAPTION_BORDER = 6; | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * The array index for the | |
| 103 | + * {@link #window} system color. | |
| 104 | + * @see SystemColor#window | |
| 105 | + */ | |
| 106 | + public final static int WINDOW = 7; | |
| 107 | + | |
| 108 | + /** | |
| 109 | + * The array index for the | |
| 110 | + * {@link #windowBorder} system color. | |
| 111 | + * @see SystemColor#windowBorder | |
| 112 | + */ | |
| 113 | + public final static int WINDOW_BORDER = 8; | |
| 114 | + | |
| 115 | + /** | |
| 116 | + * The array index for the | |
| 117 | + * {@link #windowText} system color. | |
| 118 | + * @see SystemColor#windowText | |
| 119 | + */ | |
| 120 | + public final static int WINDOW_TEXT = 9; | |
| 121 | + | |
| 122 | + /** | |
| 123 | + * The array index for the | |
| 124 | + * {@link #menu} system color. | |
| 125 | + * @see SystemColor#menu | |
| 126 | + */ | |
| 127 | + public final static int MENU = 10; | |
| 128 | + | |
| 129 | + /** | |
| 130 | + * The array index for the | |
| 131 | + * {@link #menuText} system color. | |
| 132 | + * @see SystemColor#menuText | |
| 133 | + */ | |
| 134 | + public final static int MENU_TEXT = 11; | |
| 135 | + | |
| 136 | + /** | |
| 137 | + * The array index for the | |
| 138 | + * {@link #text} system color. | |
| 139 | + * @see SystemColor#text | |
| 140 | + */ | |
| 141 | + public final static int TEXT = 12; | |
| 142 | + | |
| 143 | + /** | |
| 144 | + * The array index for the | |
| 145 | + * {@link #textText} system color. | |
| 146 | + * @see SystemColor#textText | |
| 147 | + */ | |
| 148 | + public final static int TEXT_TEXT = 13; | |
| 149 | + | |
| 150 | + /** | |
| 151 | + * The array index for the | |
| 152 | + * {@link #textHighlight} system color. | |
| 153 | + * @see SystemColor#textHighlight | |
| 154 | + */ | |
| 155 | + public final static int TEXT_HIGHLIGHT = 14; | |
| 156 | + | |
| 157 | + /** | |
| 158 | + * The array index for the | |
| 159 | + * {@link #textHighlightText} system color. | |
| 160 | + * @see SystemColor#textHighlightText | |
| 161 | + */ | |
| 162 | + public final static int TEXT_HIGHLIGHT_TEXT = 15; | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * The array index for the | |
| 166 | + * {@link #textInactiveText} system color. | |
| 167 | + * @see SystemColor#textInactiveText | |
| 168 | + */ | |
| 169 | + public final static int TEXT_INACTIVE_TEXT = 16; | |
| 170 | + | |
| 171 | + /** | |
| 172 | + * The array index for the | |
| 173 | + * {@link #control} system color. | |
| 174 | + * @see SystemColor#control | |
| 175 | + */ | |
| 176 | + public final static int CONTROL = 17; | |
| 177 | + | |
| 178 | + /** | |
| 179 | + * The array index for the | |
| 180 | + * {@link #controlText} system color. | |
| 181 | + * @see SystemColor#controlText | |
| 182 | + */ | |
| 183 | + public final static int CONTROL_TEXT = 18; | |
| 184 | + | |
| 185 | + /** | |
| 186 | + * The array index for the | |
| 187 | + * {@link #controlHighlight} system color. | |
| 188 | + * @see SystemColor#controlHighlight | |
| 189 | + */ | |
| 190 | + public final static int CONTROL_HIGHLIGHT = 19; | |
| 191 | + | |
| 192 | + /** | |
| 193 | + * The array index for the | |
| 194 | + * {@link #controlLtHighlight} system color. | |
| 195 | + * @see SystemColor#controlLtHighlight | |
| 196 | + */ | |
| 197 | + public final static int CONTROL_LT_HIGHLIGHT = 20; | |
| 198 | + | |
| 199 | + /** | |
| 200 | + * The array index for the | |
| 201 | + * {@link #controlShadow} system color. | |
| 202 | + * @see SystemColor#controlShadow | |
| 203 | + */ | |
| 204 | + public final static int CONTROL_SHADOW = 21; | |
| 205 | + | |
| 206 | + /** | |
| 207 | + * The array index for the | |
| 208 | + * {@link #controlDkShadow} system color. | |
| 209 | + * @see SystemColor#controlDkShadow | |
| 210 | + */ | |
| 211 | + public final static int CONTROL_DK_SHADOW = 22; | |
| 212 | + | |
| 213 | + /** | |
| 214 | + * The array index for the | |
| 215 | + * {@link #scrollbar} system color. | |
| 216 | + * @see SystemColor#scrollbar | |
| 217 | + */ | |
| 218 | + public final static int SCROLLBAR = 23; | |
| 219 | + | |
| 220 | + /** | |
| 221 | + * The array index for the | |
| 222 | + * {@link #info} system color. | |
| 223 | + * @see SystemColor#info | |
| 224 | + */ | |
| 225 | + public final static int INFO = 24; | |
| 226 | + | |
| 227 | + /** | |
| 228 | + * The array index for the | |
| 229 | + * {@link #infoText} system color. | |
| 230 | + * @see SystemColor#infoText | |
| 231 | + */ | |
| 232 | + public final static int INFO_TEXT = 25; | |
| 233 | + | |
| 234 | + /** | |
| 235 | + * The number of system colors in the array. | |
| 236 | + */ | |
| 237 | + public final static int NUM_COLORS = 26; | |
| 238 | + | |
| 239 | + /******************************************************************************************/ | |
| 240 | + | |
| 241 | + /* | |
| 242 | + * System colors with default initial values, overwritten by toolkit if | |
| 243 | + * system values differ and are available. | |
| 244 | + * Should put array initialization above first field that is using | |
| 245 | + * SystemColor constructor to initialize. | |
| 246 | + */ | |
| 247 | + private static int[] systemColors = { | |
| 248 | + 0xFF005C5C, // desktop = new Color(0,92,92); | |
| 249 | + 0xFF000080, // activeCaption = new Color(0,0,128); | |
| 250 | + 0xFFFFFFFF, // activeCaptionText = Color.white; | |
| 251 | + 0xFFC0C0C0, // activeCaptionBorder = Color.lightGray; | |
| 252 | + 0xFF808080, // inactiveCaption = Color.gray; | |
| 253 | + 0xFFC0C0C0, // inactiveCaptionText = Color.lightGray; | |
| 254 | + 0xFFC0C0C0, // inactiveCaptionBorder = Color.lightGray; | |
| 255 | + 0xFFFFFFFF, // window = Color.white; | |
| 256 | + 0xFF000000, // windowBorder = Color.black; | |
| 257 | + 0xFF000000, // windowText = Color.black; | |
| 258 | + 0xFFC0C0C0, // menu = Color.lightGray; | |
| 259 | + 0xFF000000, // menuText = Color.black; | |
| 260 | + 0xFFC0C0C0, // text = Color.lightGray; | |
| 261 | + 0xFF000000, // textText = Color.black; | |
| 262 | + 0xFF000080, // textHighlight = new Color(0,0,128); | |
| 263 | + 0xFFFFFFFF, // textHighlightText = Color.white; | |
| 264 | + 0xFF808080, // textInactiveText = Color.gray; | |
| 265 | + 0xFFC0C0C0, // control = Color.lightGray; | |
| 266 | + 0xFF000000, // controlText = Color.black; | |
| 267 | + 0xFFFFFFFF, // controlHighlight = Color.white; | |
| 268 | + 0xFFE0E0E0, // controlLtHighlight = new Color(224,224,224); | |
| 269 | + 0xFF808080, // controlShadow = Color.gray; | |
| 270 | + 0xFF000000, // controlDkShadow = Color.black; | |
| 271 | + 0xFFE0E0E0, // scrollbar = new Color(224,224,224); | |
| 272 | + 0xFFE0E000, // info = new Color(224,224,0); | |
| 273 | + 0xFF000000, // infoText = Color.black; | |
| 274 | + }; | |
| 275 | + | |
| 276 | + /** | |
| 277 | + * The color rendered for the background of the desktop. | |
| 278 | + */ | |
| 279 | + public final static SystemColor desktop = new SystemColor((byte)DESKTOP); | |
| 280 | + | |
| 281 | + /** | |
| 282 | + * The color rendered for the window-title background of the currently active window. | |
| 283 | + */ | |
| 284 | + public final static SystemColor activeCaption = new SystemColor((byte)ACTIVE_CAPTION); | |
| 285 | + | |
| 286 | + /** | |
| 287 | + * The color rendered for the window-title text of the currently active window. | |
| 288 | + */ | |
| 289 | + public final static SystemColor activeCaptionText = new SystemColor((byte)ACTIVE_CAPTION_TEXT); | |
| 290 | + | |
| 291 | + /** | |
| 292 | + * The color rendered for the border around the currently active window. | |
| 293 | + */ | |
| 294 | + public final static SystemColor activeCaptionBorder = new SystemColor((byte)ACTIVE_CAPTION_BORDER); | |
| 295 | + | |
| 296 | + /** | |
| 297 | + * The color rendered for the window-title background of inactive windows. | |
| 298 | + */ | |
| 299 | + public final static SystemColor inactiveCaption = new SystemColor((byte)INACTIVE_CAPTION); | |
| 300 | + | |
| 301 | + /** | |
| 302 | + * The color rendered for the window-title text of inactive windows. | |
| 303 | + */ | |
| 304 | + public final static SystemColor inactiveCaptionText = new SystemColor((byte)INACTIVE_CAPTION_TEXT); | |
| 305 | + | |
| 306 | + /** | |
| 307 | + * The color rendered for the border around inactive windows. | |
| 308 | + */ | |
| 309 | + public final static SystemColor inactiveCaptionBorder = new SystemColor((byte)INACTIVE_CAPTION_BORDER); | |
| 310 | + | |
| 311 | + /** | |
| 312 | + * The color rendered for the background of interior regions inside windows. | |
| 313 | + */ | |
| 314 | + public final static SystemColor window = new SystemColor((byte)WINDOW); | |
| 315 | + | |
| 316 | + /** | |
| 317 | + * The color rendered for the border around interior regions inside windows. | |
| 318 | + */ | |
| 319 | + public final static SystemColor windowBorder = new SystemColor((byte)WINDOW_BORDER); | |
| 320 | + | |
| 321 | + /** | |
| 322 | + * The color rendered for text of interior regions inside windows. | |
| 323 | + */ | |
| 324 | + public final static SystemColor windowText = new SystemColor((byte)WINDOW_TEXT); | |
| 325 | + | |
| 326 | + /** | |
| 327 | + * The color rendered for the background of menus. | |
| 328 | + */ | |
| 329 | + public final static SystemColor menu = new SystemColor((byte)MENU); | |
| 330 | + | |
| 331 | + /** | |
| 332 | + * The color rendered for the text of menus. | |
| 333 | + */ | |
| 334 | + public final static SystemColor menuText = new SystemColor((byte)MENU_TEXT); | |
| 335 | + | |
| 336 | + /** | |
| 337 | + * The color rendered for the background of text control objects, such as | |
| 338 | + * textfields and comboboxes. | |
| 339 | + */ | |
| 340 | + public final static SystemColor text = new SystemColor((byte)TEXT); | |
| 341 | + | |
| 342 | + /** | |
| 343 | + * The color rendered for the text of text control objects, such as textfields | |
| 344 | + * and comboboxes. | |
| 345 | + */ | |
| 346 | + public final static SystemColor textText = new SystemColor((byte)TEXT_TEXT); | |
| 347 | + | |
| 348 | + /** | |
| 349 | + * The color rendered for the background of selected items, such as in menus, | |
| 350 | + * comboboxes, and text. | |
| 351 | + */ | |
| 352 | + public final static SystemColor textHighlight = new SystemColor((byte)TEXT_HIGHLIGHT); | |
| 353 | + | |
| 354 | + /** | |
| 355 | + * The color rendered for the text of selected items, such as in menus, comboboxes, | |
| 356 | + * and text. | |
| 357 | + */ | |
| 358 | + public final static SystemColor textHighlightText = new SystemColor((byte)TEXT_HIGHLIGHT_TEXT); | |
| 359 | + | |
| 360 | + /** | |
| 361 | + * The color rendered for the text of inactive items, such as in menus. | |
| 362 | + */ | |
| 363 | + public final static SystemColor textInactiveText = new SystemColor((byte)TEXT_INACTIVE_TEXT); | |
| 364 | + | |
| 365 | + /** | |
| 366 | + * The color rendered for the background of control panels and control objects, | |
| 367 | + * such as pushbuttons. | |
| 368 | + */ | |
| 369 | + public final static SystemColor control = new SystemColor((byte)CONTROL); | |
| 370 | + | |
| 371 | + /** | |
| 372 | + * The color rendered for the text of control panels and control objects, | |
| 373 | + * such as pushbuttons. | |
| 374 | + */ | |
| 375 | + public final static SystemColor controlText = new SystemColor((byte)CONTROL_TEXT); | |
| 376 | + | |
| 377 | + /** | |
| 378 | + * The color rendered for light areas of 3D control objects, such as pushbuttons. | |
| 379 | + * This color is typically derived from the <code>control</code> background color | |
| 380 | + * to provide a 3D effect. | |
| 381 | + */ | |
| 382 | + public final static SystemColor controlHighlight = new SystemColor((byte)CONTROL_HIGHLIGHT); | |
| 383 | + | |
| 384 | + /** | |
| 385 | + * The color rendered for highlight areas of 3D control objects, such as pushbuttons. | |
| 386 | + * This color is typically derived from the <code>control</code> background color | |
| 387 | + * to provide a 3D effect. | |
| 388 | + */ | |
| 389 | + public final static SystemColor controlLtHighlight = new SystemColor((byte)CONTROL_LT_HIGHLIGHT); | |
| 390 | + | |
| 391 | + /** | |
| 392 | + * The color rendered for shadow areas of 3D control objects, such as pushbuttons. | |
| 393 | + * This color is typically derived from the <code>control</code> background color | |
| 394 | + * to provide a 3D effect. | |
| 395 | + */ | |
| 396 | + public final static SystemColor controlShadow = new SystemColor((byte)CONTROL_SHADOW); | |
| 397 | + | |
| 398 | + /** | |
| 399 | + * The color rendered for dark shadow areas on 3D control objects, such as pushbuttons. | |
| 400 | + * This color is typically derived from the <code>control</code> background color | |
| 401 | + * to provide a 3D effect. | |
| 402 | + */ | |
| 403 | + public final static SystemColor controlDkShadow = new SystemColor((byte)CONTROL_DK_SHADOW); | |
| 404 | + | |
| 405 | + /** | |
| 406 | + * The color rendered for the background of scrollbars. | |
| 407 | + */ | |
| 408 | + public final static SystemColor scrollbar = new SystemColor((byte)SCROLLBAR); | |
| 409 | + | |
| 410 | + /** | |
| 411 | + * The color rendered for the background of tooltips or spot help. | |
| 412 | + */ | |
| 413 | + public final static SystemColor info = new SystemColor((byte)INFO); | |
| 414 | + | |
| 415 | + /** | |
| 416 | + * The color rendered for the text of tooltips or spot help. | |
| 417 | + */ | |
| 418 | + public final static SystemColor infoText = new SystemColor((byte)INFO_TEXT); | |
| 419 | + | |
| 420 | + /* | |
| 421 | + * JDK 1.1 serialVersionUID. | |
| 422 | + */ | |
| 423 | + private static final long serialVersionUID = 4503142729533789064L; | |
| 424 | + | |
| 425 | + /* | |
| 426 | + * An index into either array of SystemColor objects or values. | |
| 427 | + */ | |
| 428 | + private transient int index; | |
| 429 | + | |
| 430 | + private static SystemColor systemColorObjects [] = { | |
| 431 | + SystemColor.desktop, | |
| 432 | + SystemColor.activeCaption, | |
| 433 | + SystemColor.activeCaptionText, | |
| 434 | + SystemColor.activeCaptionBorder, | |
| 435 | + SystemColor.inactiveCaption, | |
| 436 | + SystemColor.inactiveCaptionText, | |
| 437 | + SystemColor.inactiveCaptionBorder, | |
| 438 | + SystemColor.window, | |
| 439 | + SystemColor.windowBorder, | |
| 440 | + SystemColor.windowText, | |
| 441 | + SystemColor.menu, | |
| 442 | + SystemColor.menuText, | |
| 443 | + SystemColor.text, | |
| 444 | + SystemColor.textText, | |
| 445 | + SystemColor.textHighlight, | |
| 446 | + SystemColor.textHighlightText, | |
| 447 | + SystemColor.textInactiveText, | |
| 448 | + SystemColor.control, | |
| 449 | + SystemColor.controlText, | |
| 450 | + SystemColor.controlHighlight, | |
| 451 | + SystemColor.controlLtHighlight, | |
| 452 | + SystemColor.controlShadow, | |
| 453 | + SystemColor.controlDkShadow, | |
| 454 | + SystemColor.scrollbar, | |
| 455 | + SystemColor.info, | |
| 456 | + SystemColor.infoText | |
| 457 | + }; | |
| 458 | + | |
| 459 | + static { | |
| 460 | + updateSystemColors(); | |
| 461 | + } | |
| 462 | + | |
| 463 | + /** | |
| 464 | + * Called from <init> & toolkit to update the above systemColors cache. | |
| 465 | + */ | |
| 466 | + private static void updateSystemColors() { | |
| 467 | + if (!GraphicsEnvironment.isHeadless()) { | |
| 468 | + Toolkit.getDefaultToolkit().loadSystemColors(systemColors); | |
| 469 | + } | |
| 470 | + for (int i = 0; i < systemColors.length; i++) { | |
| 471 | + systemColorObjects[i].value = systemColors[i]; | |
| 472 | + } | |
| 473 | + } | |
| 474 | + | |
| 475 | + /** | |
| 476 | + * Creates a symbolic color that represents an indexed entry into system | |
| 477 | + * color cache. Used by above static system colors. | |
| 478 | + */ | |
| 479 | + private SystemColor(byte index) { | |
| 480 | + super(systemColors[index]); | |
| 481 | + this.index = index; | |
| 482 | + } | |
| 483 | + | |
| 484 | + /** | |
| 485 | + * Returns a string representation of this <code>Color</code>'s values. | |
| 486 | + * This method is intended to be used only for debugging purposes, | |
| 487 | + * and the content and format of the returned string may vary between | |
| 488 | + * implementations. | |
| 489 | + * The returned string may be empty but may not be <code>null</code>. | |
| 490 | + * | |
| 491 | + * @return a string representation of this <code>Color</code> | |
| 492 | + */ | |
| 493 | + public String toString() { | |
| 494 | + return getClass().getName() + "[i=" + (index) + "]"; | |
| 495 | + } | |
| 496 | + | |
| 497 | + /** | |
| 498 | + * The design of the {@code SystemColor} class assumes that | |
| 499 | + * the {@code SystemColor} object instances stored in the | |
| 500 | + * static final fields above are the only instances that can | |
| 501 | + * be used by developers. | |
| 502 | + * This method helps maintain those limits on instantiation | |
| 503 | + * by using the index stored in the value field of the | |
| 504 | + * serialized form of the object to replace the serialized | |
| 505 | + * object with the equivalent static object constant field | |
| 506 | + * of {@code SystemColor}. | |
| 507 | + * See the {@link #writeReplace} method for more information | |
| 508 | + * on the serialized form of these objects. | |
| 509 | + * @return one of the {@code SystemColor} static object | |
| 510 | + * fields that refers to the same system color. | |
| 511 | + */ | |
| 512 | + private Object readResolve() { | |
| 513 | + // The instances of SystemColor are tightly controlled and | |
| 514 | + // only the canonical instances appearing above as static | |
| 515 | + // constants are allowed. The serial form of SystemColor | |
| 516 | + // objects stores the color index as the value. Here we | |
| 517 | + // map that index back into the canonical instance. | |
| 518 | + return systemColorObjects[value]; | |
| 519 | + } | |
| 520 | + | |
| 521 | + /** | |
| 522 | + * Returns a specialized version of the {@code SystemColor} | |
| 523 | + * object for writing to the serialized stream. | |
| 524 | + * @serialData | |
| 525 | + * The value field of a serialized {@code SystemColor} object | |
| 526 | + * contains the array index of the system color instead of the | |
| 527 | + * rgb data for the system color. | |
| 528 | + * This index is used by the {@link #readResolve} method to | |
| 529 | + * resolve the deserialized objects back to the original | |
| 530 | + * static constant versions to ensure unique instances of | |
| 531 | + * each {@code SystemColor} object. | |
| 532 | + * @return a proxy {@code SystemColor} object with its value | |
| 533 | + * replaced by the corresponding system color index. | |
| 534 | + */ | |
| 535 | + private Object writeReplace() throws ObjectStreamException | |
| 536 | + { | |
| 537 | + // we put an array index in the SystemColor.value while serialize | |
| 538 | + // to keep compatibility. | |
| 539 | + SystemColor color = new SystemColor((byte)index); | |
| 540 | + color.value = index; | |
| 541 | + return color; | |
| 542 | + } | |
| 543 | +} | |