Mercurial > projects > dwt-win
annotate dwt/custom/CLabel.d @ 315:349b8c12e243
Sync dwt/custom with dwt-linux
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Tue, 07 Oct 2008 16:18:26 +0200 |
| parents | fd9c62a2998e |
| children |
| rev | line source |
|---|---|
| 155 | 1 /******************************************************************************* |
| 246 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 155 | 3 * All rights reserved. This program and the accompanying materials |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwt.custom.CLabel; | |
| 14 | |
| 15 | |
| 16 import dwt.DWT; | |
| 17 import dwt.DWTException; | |
| 18 import dwt.accessibility.ACC; | |
| 19 import dwt.accessibility.Accessible; | |
| 20 import dwt.accessibility.AccessibleAdapter; | |
| 21 import dwt.accessibility.AccessibleControlAdapter; | |
| 22 import dwt.accessibility.AccessibleControlEvent; | |
| 23 import dwt.accessibility.AccessibleEvent; | |
| 24 import dwt.events.DisposeEvent; | |
| 25 import dwt.events.DisposeListener; | |
| 26 import dwt.events.PaintEvent; | |
| 27 import dwt.events.PaintListener; | |
| 28 import dwt.events.TraverseEvent; | |
| 29 import dwt.events.TraverseListener; | |
| 30 import dwt.graphics.Color; | |
| 31 import dwt.graphics.Font; | |
| 32 import dwt.graphics.GC; | |
| 33 import dwt.graphics.Image; | |
| 34 import dwt.graphics.Point; | |
| 35 import dwt.graphics.Rectangle; | |
| 213 | 36 import dwt.graphics.TextLayout; |
| 155 | 37 import dwt.widgets.Canvas; |
| 38 import dwt.widgets.Composite; | |
| 39 import dwt.widgets.Control; | |
| 40 import dwt.widgets.Display; | |
|
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41 import dwt.dwthelper.utils; |
| 155 | 42 |
| 43 static import tango.text.Unicode; | |
| 44 static import tango.text.convert.Utf; | |
| 45 | |
| 46 /** | |
| 47 * A Label which supports aligned text and/or an image and different border styles. | |
| 48 * <p> | |
| 49 * If there is not enough space a CLabel uses the following strategy to fit the | |
| 50 * information into the available space: | |
| 51 * <pre> | |
| 52 * ignores the indent in left align mode | |
| 53 * ignores the image and the gap | |
| 54 * shortens the text by replacing the center portion of the label with an ellipsis | |
| 55 * shortens the text by removing the center portion of the label | |
| 56 * </pre> | |
| 57 * <p> | |
| 58 * <dl> | |
| 59 * <dt><b>Styles:</b> | |
| 60 * <dd>LEFT, RIGHT, CENTER, SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd> | |
| 61 * <dt><b>Events:</b> | |
| 62 * <dd></dd> | |
| 63 * </dl> | |
| 64 * | |
| 65 * </p><p> | |
| 66 * IMPORTANT: This class is <em>not</em> intended to be subclassed. | |
| 67 * </p> | |
| 246 | 68 * |
| 69 * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: CustomControlExample</a> | |
| 70 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> | |
| 155 | 71 */ |
| 72 public class CLabel : Canvas { | |
| 73 | |
| 74 alias Canvas.computeSize computeSize; | |
| 75 | |
| 76 /** Gap between icon and text */ | |
| 77 private static const int GAP = 5; | |
| 78 /** Left and right margins */ | |
| 79 private static const int INDENT = 3; | |
| 80 /** a string inserted in the middle of text that has been shortened */ | |
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81 private static const String ELLIPSIS = "..."; //$NON-NLS-1$ // could use the ellipsis glyph on some platforms "\u2026" |
| 155 | 82 /** the alignment. Either CENTER, RIGHT, LEFT. Default is LEFT*/ |
| 83 private int align_ = DWT.LEFT; | |
| 84 private int hIndent = INDENT; | |
| 85 private int vIndent = INDENT; | |
| 86 /** the current text */ | |
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87 private String text; |
| 155 | 88 /** the current icon */ |
| 89 private Image image; | |
| 90 // The tooltip is used for two purposes - the application can set | |
| 91 // a tooltip or the tooltip can be used to display the full text when the | |
| 92 // the text has been truncated due to the label being too short. | |
| 93 // The appToolTip stores the tooltip set by the application. Control.tooltiptext | |
| 94 // contains whatever tooltip is currently being displayed. | |
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95 private String appToolTipText; |
| 155 | 96 |
| 97 private Image backgroundImage; | |
| 98 private Color[] gradientColors; | |
| 99 private int[] gradientPercents; | |
| 100 private bool gradientVertical; | |
| 101 private Color background; | |
| 102 | |
| 103 private static int DRAW_FLAGS = DWT.DRAW_MNEMONIC | DWT.DRAW_TAB | DWT.DRAW_TRANSPARENT | DWT.DRAW_DELIMITER; | |
| 104 | |
| 105 /** | |
| 106 * Constructs a new instance of this class given its parent | |
| 107 * and a style value describing its behavior and appearance. | |
| 108 * <p> | |
| 109 * The style value is either one of the style constants defined in | |
| 110 * class <code>DWT</code> which is applicable to instances of this | |
| 111 * class, or must be built by <em>bitwise OR</em>'ing together | |
| 112 * (that is, using the <code>int</code> "|" operator) two or more | |
| 113 * of those <code>DWT</code> style constants. The class description | |
| 114 * lists the style constants that are applicable to the class. | |
| 115 * Style bits are also inherited from superclasses. | |
| 116 * </p> | |
| 117 * | |
| 118 * @param parent a widget which will be the parent of the new instance (cannot be null) | |
| 119 * @param style the style of widget to construct | |
| 120 * | |
| 121 * @exception IllegalArgumentException <ul> | |
| 122 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> | |
| 123 * </ul> | |
| 124 * @exception DWTException <ul> | |
| 125 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> | |
| 126 * </ul> | |
| 127 * | |
| 128 * @see DWT#LEFT | |
| 129 * @see DWT#RIGHT | |
| 130 * @see DWT#CENTER | |
| 131 * @see DWT#SHADOW_IN | |
| 132 * @see DWT#SHADOW_OUT | |
| 133 * @see DWT#SHADOW_NONE | |
| 134 * @see #getStyle() | |
| 135 */ | |
| 136 public this(Composite parent, int style) { | |
| 137 super(parent, checkStyle(style)); | |
| 138 if ((style & (DWT.CENTER | DWT.RIGHT)) is 0) style |= DWT.LEFT; | |
| 139 if ((style & DWT.CENTER) !is 0) align_ = DWT.CENTER; | |
| 140 if ((style & DWT.RIGHT) !is 0) align_ = DWT.RIGHT; | |
| 141 if ((style & DWT.LEFT) !is 0) align_ = DWT.LEFT; | |
| 142 | |
| 143 addPaintListener(new class() PaintListener{ | |
| 144 public void paintControl(PaintEvent event) { | |
| 145 onPaint(event); | |
| 146 } | |
| 147 }); | |
| 148 | |
| 149 addDisposeListener(new class() DisposeListener{ | |
| 150 public void widgetDisposed(DisposeEvent event) { | |
| 151 onDispose(event); | |
| 152 } | |
| 153 }); | |
| 154 | |
| 155 addTraverseListener(new class() TraverseListener { | |
| 156 public void keyTraversed(TraverseEvent event) { | |
| 157 if (event.detail is DWT.TRAVERSE_MNEMONIC) { | |
| 158 onMnemonic(event); | |
| 159 } | |
| 160 } | |
| 161 }); | |
| 162 | |
| 163 initAccessible(); | |
| 164 | |
| 165 } | |
| 166 /** | |
| 167 * Check the style bits to ensure that no invalid styles are applied. | |
| 168 */ | |
| 169 private static int checkStyle (int style) { | |
| 170 if ((style & DWT.BORDER) !is 0) style |= DWT.SHADOW_IN; | |
| 171 int mask = DWT.SHADOW_IN | DWT.SHADOW_OUT | DWT.SHADOW_NONE | DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT; | |
| 172 style = style & mask; | |
| 173 return style |= DWT.NO_FOCUS | DWT.DOUBLE_BUFFERED; | |
| 174 } | |
| 175 | |
| 176 //protected void checkSubclass () { | |
| 177 // String name = getClass().getName (); | |
| 178 // String validName = CLabel.class.getName(); | |
| 179 // if (!validName.equals(name)) { | |
| 180 // DWT.error (DWT.ERROR_INVALID_SUBCLASS); | |
| 181 // } | |
| 182 //} | |
| 183 | |
| 184 public override Point computeSize(int wHint, int hHint, bool changed) { | |
| 185 checkWidget(); | |
| 186 Point e = getTotalSize(image, text); | |
| 187 if (wHint is DWT.DEFAULT){ | |
| 188 e.x += 2*hIndent; | |
| 189 } else { | |
| 190 e.x = wHint; | |
| 191 } | |
| 192 if (hHint is DWT.DEFAULT) { | |
| 193 e.y += 2*vIndent; | |
| 194 } else { | |
| 195 e.y = hHint; | |
| 196 } | |
| 197 return e; | |
| 198 } | |
| 199 /** | |
| 200 * Draw a rectangle in the given colors. | |
| 201 */ | |
| 202 private void drawBevelRect(GC gc, int x, int y, int w, int h, Color topleft, Color bottomright) { | |
| 203 gc.setForeground(bottomright); | |
| 204 gc.drawLine(x+w, y, x+w, y+h); | |
| 205 gc.drawLine(x, y+h, x+w, y+h); | |
| 206 | |
| 207 gc.setForeground(topleft); | |
| 208 gc.drawLine(x, y, x+w-1, y); | |
| 209 gc.drawLine(x, y, x, y+h-1); | |
| 210 } | |
| 211 /* | |
| 212 * Return the lowercase of the first non-'&' character following | |
| 213 * an '&' character in the given string. If there are no '&' | |
| 214 * characters in the given string, return '\0'. | |
| 215 */ | |
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216 dchar _findMnemonic (String string) { |
| 155 | 217 if (string is null) return '\0'; |
| 218 int index = 0; | |
| 219 int length = string.length; | |
| 220 do { | |
| 221 while (index < length && string[index] !is '&') index++; | |
| 222 if (++index >= length) return '\0'; | |
| 223 if (string[index] !is '&') { | |
| 224 dchar[1] tmp; uint ate; | |
| 225 dchar[] tmp2 = tango.text.convert.Utf.toString32( string[index .. Math.min( index + 4, string.length ) ], tmp, &ate ); | |
| 226 assert( tmp2.length == 1 ); | |
| 227 return tango.text.Unicode.toLower( tmp2 )[0]; | |
| 228 } | |
| 229 index++; | |
| 230 } while (index < length); | |
| 231 return '\0'; | |
| 232 } | |
| 233 /** | |
| 234 * Returns the alignment. | |
| 235 * The alignment style (LEFT, CENTER or RIGHT) is returned. | |
| 236 * | |
| 237 * @return DWT.LEFT, DWT.RIGHT or DWT.CENTER | |
| 238 */ | |
| 239 public int getAlignment() { | |
| 240 //checkWidget(); | |
| 241 return align_; | |
| 242 } | |
| 243 /** | |
| 244 * Return the CLabel's image or <code>null</code>. | |
| 245 * | |
| 246 * @return the image of the label or null | |
| 247 */ | |
| 248 public Image getImage() { | |
| 249 //checkWidget(); | |
| 250 return image; | |
| 251 } | |
| 252 /** | |
| 253 * Compute the minimum size. | |
| 254 */ | |
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255 private Point getTotalSize(Image image, String text) { |
| 155 | 256 Point size = new Point(0, 0); |
| 257 | |
| 258 if (image !is null) { | |
| 259 Rectangle r = image.getBounds(); | |
| 260 size.x += r.width; | |
| 261 size.y += r.height; | |
| 262 } | |
| 263 | |
| 264 GC gc = new GC(this); | |
| 265 if (text !is null && text.length > 0) { | |
| 266 Point e = gc.textExtent(text, DRAW_FLAGS); | |
| 267 size.x += e.x; | |
| 268 size.y = Math.max(size.y, e.y); | |
| 269 if (image !is null) size.x += GAP; | |
| 270 } else { | |
| 271 size.y = Math.max(size.y, gc.getFontMetrics().getHeight()); | |
| 272 } | |
| 273 gc.dispose(); | |
| 274 | |
| 275 return size; | |
| 276 } | |
| 277 public override int getStyle () { | |
| 278 int style = super.getStyle(); | |
| 279 switch (align_) { | |
| 280 case DWT.RIGHT: style |= DWT.RIGHT; break; | |
| 281 case DWT.CENTER: style |= DWT.CENTER; break; | |
| 282 case DWT.LEFT: style |= DWT.LEFT; break; | |
| 283 default: | |
| 284 } | |
| 285 return style; | |
| 286 } | |
| 287 | |
| 288 /** | |
| 289 * Return the Label's text. | |
| 290 * | |
| 291 * @return the text of the label or null | |
| 292 */ | |
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293 public String getText() { |
| 155 | 294 //checkWidget(); |
| 295 return text; | |
| 296 } | |
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297 public override String getToolTipText () { |
| 155 | 298 checkWidget(); |
| 299 return appToolTipText; | |
| 300 } | |
| 301 private void initAccessible() { | |
| 302 Accessible accessible = getAccessible(); | |
| 303 accessible.addAccessibleListener(new class() AccessibleAdapter { | |
| 304 public void getName(AccessibleEvent e) { | |
| 305 e.result = getText(); | |
| 306 } | |
| 307 | |
| 308 public void getHelp(AccessibleEvent e) { | |
| 309 e.result = getToolTipText(); | |
| 310 } | |
| 311 | |
| 312 public void getKeyboardShortcut(AccessibleEvent e) { | |
| 313 dchar mnemonic = _findMnemonic(this.outer.text); | |
| 314 if (mnemonic !is '\0') { | |
| 315 dchar[1] d; | |
| 316 d[0] = mnemonic; | |
| 317 e.result = "Alt+" ~ tango.text.convert.Utf.toString(d); //$NON-NLS-1$ | |
| 318 } | |
| 319 } | |
| 320 }); | |
| 321 | |
| 322 accessible.addAccessibleControlListener(new class() AccessibleControlAdapter { | |
| 323 public void getChildAtPoint(AccessibleControlEvent e) { | |
| 324 e.childID = ACC.CHILDID_SELF; | |
| 325 } | |
| 326 | |
| 327 public void getLocation(AccessibleControlEvent e) { | |
| 328 Rectangle rect = getDisplay().map(getParent(), null, getBounds()); | |
| 329 e.x = rect.x; | |
| 330 e.y = rect.y; | |
| 331 e.width = rect.width; | |
| 332 e.height = rect.height; | |
| 333 } | |
| 334 | |
| 335 public void getChildCount(AccessibleControlEvent e) { | |
| 336 e.detail = 0; | |
| 337 } | |
| 338 | |
| 339 public void getRole(AccessibleControlEvent e) { | |
| 340 e.detail = ACC.ROLE_LABEL; | |
| 341 } | |
| 342 | |
| 343 public void getState(AccessibleControlEvent e) { | |
| 344 e.detail = ACC.STATE_READONLY; | |
| 345 } | |
| 346 }); | |
| 347 } | |
| 348 void onDispose(DisposeEvent event) { | |
| 349 gradientColors = null; | |
| 350 gradientPercents = null; | |
| 351 backgroundImage = null; | |
| 352 text = null; | |
| 353 image = null; | |
| 354 appToolTipText = null; | |
| 355 } | |
| 356 void onMnemonic(TraverseEvent event) { | |
| 357 dchar mnemonic = _findMnemonic(text); | |
| 358 if (mnemonic is '\0') return; | |
| 359 dchar[1] d; uint ate; | |
| 360 auto r = tango.text.convert.Utf.toString32( [event.character][], d, &ate ); | |
| 361 if (tango.text.Unicode.toLower(r)[0] !is mnemonic) return; | |
| 362 Composite control = this.getParent(); | |
| 363 while (control !is null) { | |
| 364 Control [] children = control.getChildren(); | |
| 365 int index = 0; | |
| 366 while (index < children.length) { | |
| 367 if (children [index] is this) break; | |
| 368 index++; | |
| 369 } | |
| 370 index++; | |
| 371 if (index < children.length) { | |
| 372 if (children [index].setFocus ()) { | |
| 373 event.doit = true; | |
| 374 event.detail = DWT.TRAVERSE_NONE; | |
| 375 } | |
| 376 } | |
| 377 control = control.getParent(); | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 void onPaint(PaintEvent event) { | |
| 382 Rectangle rect = getClientArea(); | |
| 383 if (rect.width is 0 || rect.height is 0) return; | |
| 384 | |
| 385 bool shortenText_ = false; | |
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386 String t = text; |
| 155 | 387 Image img = image; |
| 388 int availableWidth = Math.max(0, rect.width - 2*hIndent); | |
| 389 Point extent = getTotalSize(img, t); | |
| 390 if (extent.x > availableWidth) { | |
| 391 img = null; | |
| 392 extent = getTotalSize(img, t); | |
| 393 if (extent.x > availableWidth) { | |
| 394 shortenText_ = true; | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 GC gc = event.gc; | |
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399 String[] lines = text is null ? null : splitString(text); |
| 155 | 400 |
| 401 // shorten the text | |
| 402 if (shortenText_) { | |
| 403 extent.x = 0; | |
| 404 for(int i = 0; i < lines.length; i++) { | |
| 405 Point e = gc.textExtent(lines[i], DRAW_FLAGS); | |
| 406 if (e.x > availableWidth) { | |
| 407 lines[i] = shortenText(gc, lines[i], availableWidth); | |
| 408 extent.x = Math.max(extent.x, getTotalSize(null, lines[i]).x); | |
| 409 } else { | |
| 410 extent.x = Math.max(extent.x, e.x); | |
| 411 } | |
| 412 } | |
| 413 if (appToolTipText is null) { | |
| 414 super.setToolTipText(text); | |
| 415 } | |
| 416 } else { | |
| 417 super.setToolTipText(appToolTipText); | |
| 418 } | |
| 419 | |
| 420 // determine horizontal position | |
| 421 int x = rect.x + hIndent; | |
| 422 if (align_ is DWT.CENTER) { | |
| 423 x = (rect.width - extent.x)/2; | |
| 424 } | |
| 425 if (align_ is DWT.RIGHT) { | |
| 426 x = rect.width - hIndent - extent.x; | |
| 427 } | |
| 428 | |
| 429 // draw a background image behind the text | |
| 430 try { | |
| 431 if (backgroundImage !is null) { | |
| 432 // draw a background image behind the text | |
| 433 Rectangle imageRect = backgroundImage.getBounds(); | |
| 434 // tile image to fill space | |
| 435 gc.setBackground(getBackground()); | |
| 436 gc.fillRectangle(rect); | |
| 437 int xPos = 0; | |
| 438 while (xPos < rect.width) { | |
| 439 int yPos = 0; | |
| 440 while (yPos < rect.height) { | |
| 441 gc.drawImage(backgroundImage, xPos, yPos); | |
| 442 yPos += imageRect.height; | |
| 443 } | |
| 444 xPos += imageRect.width; | |
| 445 } | |
| 446 } else if (gradientColors !is null) { | |
| 447 // draw a gradient behind the text | |
| 448 final Color oldBackground = gc.getBackground(); | |
| 449 if (gradientColors.length is 1) { | |
| 450 if (gradientColors[0] !is null) gc.setBackground(gradientColors[0]); | |
| 451 gc.fillRectangle(0, 0, rect.width, rect.height); | |
| 452 } else { | |
| 453 final Color oldForeground = gc.getForeground(); | |
| 454 Color lastColor = gradientColors[0]; | |
| 455 if (lastColor is null) lastColor = oldBackground; | |
| 456 int pos = 0; | |
| 457 for (int i = 0; i < gradientPercents.length; ++i) { | |
| 458 gc.setForeground(lastColor); | |
| 459 lastColor = gradientColors[i + 1]; | |
| 460 if (lastColor is null) lastColor = oldBackground; | |
| 461 gc.setBackground(lastColor); | |
| 462 if (gradientVertical) { | |
| 463 final int gradientHeight = (gradientPercents[i] * rect.height / 100) - pos; | |
| 464 gc.fillGradientRectangle(0, pos, rect.width, gradientHeight, true); | |
| 465 pos += gradientHeight; | |
| 466 } else { | |
| 467 final int gradientWidth = (gradientPercents[i] * rect.width / 100) - pos; | |
| 468 gc.fillGradientRectangle(pos, 0, gradientWidth, rect.height, false); | |
| 469 pos += gradientWidth; | |
| 470 } | |
| 471 } | |
| 472 if (gradientVertical && pos < rect.height) { | |
| 473 gc.setBackground(getBackground()); | |
| 474 gc.fillRectangle(0, pos, rect.width, rect.height - pos); | |
| 475 } | |
| 476 if (!gradientVertical && pos < rect.width) { | |
| 477 gc.setBackground(getBackground()); | |
| 478 gc.fillRectangle(pos, 0, rect.width - pos, rect.height); | |
| 479 } | |
| 480 gc.setForeground(oldForeground); | |
| 481 } | |
| 482 gc.setBackground(oldBackground); | |
| 483 } else { | |
| 484 if (background !is null || (getStyle() & DWT.DOUBLE_BUFFERED) is 0) { | |
| 485 gc.setBackground(getBackground()); | |
| 486 gc.fillRectangle(rect); | |
| 487 } | |
| 488 } | |
| 489 } catch (DWTException e) { | |
| 490 if ((getStyle() & DWT.DOUBLE_BUFFERED) is 0) { | |
| 491 gc.setBackground(getBackground()); | |
| 492 gc.fillRectangle(rect); | |
| 493 } | |
| 494 } | |
| 495 | |
| 496 // draw border | |
| 497 int style = getStyle(); | |
| 498 if ((style & DWT.SHADOW_IN) !is 0 || (style & DWT.SHADOW_OUT) !is 0) { | |
| 499 paintBorder(gc, rect); | |
| 500 } | |
| 501 | |
| 502 // draw the image | |
| 503 if (img !is null) { | |
| 504 Rectangle imageRect = img.getBounds(); | |
| 505 gc.drawImage(img, 0, 0, imageRect.width, imageRect.height, | |
| 506 x, (rect.height-imageRect.height)/2, imageRect.width, imageRect.height); | |
| 507 x += imageRect.width + GAP; | |
| 508 extent.x -= imageRect.width + GAP; | |
| 509 } | |
| 510 // draw the text | |
| 511 if (lines !is null) { | |
| 512 int lineHeight = gc.getFontMetrics().getHeight(); | |
| 513 int textHeight = lines.length * lineHeight; | |
| 514 int lineY = Math.max(vIndent, rect.y + (rect.height - textHeight) / 2); | |
| 515 gc.setForeground(getForeground()); | |
| 516 for (int i = 0; i < lines.length; i++) { | |
| 517 int lineX = x; | |
| 518 if (lines.length > 1) { | |
| 519 if (align_ is DWT.CENTER) { | |
| 520 int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x; | |
| 521 lineX = x + Math.max(0, (extent.x - lineWidth) / 2); | |
| 522 } | |
| 523 if (align_ is DWT.RIGHT) { | |
| 524 int lineWidth = gc.textExtent(lines[i], DRAW_FLAGS).x; | |
| 525 lineX = Math.max(x, rect.x + rect.width - hIndent - lineWidth); | |
| 526 } | |
| 527 } | |
| 528 gc.drawText(lines[i], lineX, lineY, DRAW_FLAGS); | |
| 529 lineY += lineHeight; | |
| 530 } | |
| 531 } | |
| 532 } | |
| 533 /** | |
| 534 * Paint the Label's border. | |
| 535 */ | |
| 536 private void paintBorder(GC gc, Rectangle r) { | |
| 537 Display disp= getDisplay(); | |
| 538 | |
| 539 Color c1 = null; | |
| 540 Color c2 = null; | |
| 541 | |
| 542 int style = getStyle(); | |
| 543 if ((style & DWT.SHADOW_IN) !is 0) { | |
| 544 c1 = disp.getSystemColor(DWT.COLOR_WIDGET_NORMAL_SHADOW); | |
| 545 c2 = disp.getSystemColor(DWT.COLOR_WIDGET_HIGHLIGHT_SHADOW); | |
| 546 } | |
| 547 if ((style & DWT.SHADOW_OUT) !is 0) { | |
| 548 c1 = disp.getSystemColor(DWT.COLOR_WIDGET_LIGHT_SHADOW); | |
| 549 c2 = disp.getSystemColor(DWT.COLOR_WIDGET_NORMAL_SHADOW); | |
| 550 } | |
| 551 | |
| 552 if (c1 !is null && c2 !is null) { | |
| 553 gc.setLineWidth(1); | |
| 554 drawBevelRect(gc, r.x, r.y, r.width-1, r.height-1, c1, c2); | |
| 555 } | |
| 556 } | |
| 557 /** | |
| 558 * Set the alignment of the CLabel. | |
| 559 * Use the values LEFT, CENTER and RIGHT to align image and text within the available space. | |
| 560 * | |
| 561 * @param align the alignment style of LEFT, RIGHT or CENTER | |
| 562 * | |
| 563 * @exception DWTException <ul> | |
| 564 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> | |
| 565 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> | |
| 566 * <li>ERROR_INVALID_ARGUMENT - if the value of align is not one of DWT.LEFT, DWT.RIGHT or DWT.CENTER</li> | |
| 567 * </ul> | |
| 568 */ | |
| 569 public void setAlignment(int align_) { | |
| 570 checkWidget(); | |
| 571 if (align_ !is DWT.LEFT && align_ !is DWT.RIGHT && align_ !is DWT.CENTER) { | |
| 572 DWT.error(DWT.ERROR_INVALID_ARGUMENT); | |
| 573 } | |
| 574 if (this.align_ !is align_) { | |
| 575 this.align_ = align_; | |
| 576 redraw(); | |
| 577 } | |
| 578 } | |
| 579 | |
| 580 public override void setBackground (Color color) { | |
| 581 super.setBackground (color); | |
| 582 // Are these settings the same as before? | |
| 583 if (backgroundImage is null && | |
| 584 gradientColors is null && | |
| 585 gradientPercents is null) { | |
| 586 if (color is null) { | |
| 587 if (background is null) return; | |
| 588 } else { | |
| 589 if (color ==/*eq*/ background) return; | |
| 590 } | |
| 591 } | |
| 592 background = color; | |
| 593 backgroundImage = null; | |
| 594 gradientColors = null; | |
| 595 gradientPercents = null; | |
| 596 redraw (); | |
| 597 } | |
| 598 | |
| 599 /** | |
| 600 * Specify a gradient of colours to be drawn in the background of the CLabel. | |
| 601 * <p>For example, to draw a gradient that varies from dark blue to blue and then to | |
| 602 * white and stays white for the right half of the label, use the following call | |
| 603 * to setBackground:</p> | |
| 604 * <pre> | |
| 605 * clabel.setBackground(new Color[]{display.getSystemColor(DWT.COLOR_DARK_BLUE), | |
| 606 * display.getSystemColor(DWT.COLOR_BLUE), | |
| 607 * display.getSystemColor(DWT.COLOR_WHITE), | |
| 608 * display.getSystemColor(DWT.COLOR_WHITE)}, | |
| 609 * new int[] {25, 50, 100}); | |
| 610 * </pre> | |
| 611 * | |
| 612 * @param colors an array of Color that specifies the colors to appear in the gradient | |
| 613 * in order of appearance from left to right; The value <code>null</code> | |
| 614 * clears the background gradient; the value <code>null</code> can be used | |
| 615 * inside the array of Color to specify the background color. | |
| 616 * @param percents an array of integers between 0 and 100 specifying the percent of the width | |
| 617 * of the widget at which the color should change; the size of the percents | |
| 618 * array must be one less than the size of the colors array. | |
| 619 * | |
| 620 * @exception DWTException <ul> | |
| 621 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> | |
| 622 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> | |
| 623 * <li>ERROR_INVALID_ARGUMENT - if the values of colors and percents are not consistent</li> | |
| 624 * </ul> | |
| 625 */ | |
| 626 public void setBackground(Color[] colors, int[] percents) { | |
| 627 setBackground(colors, percents, false); | |
| 628 } | |
| 629 /** | |
| 630 * Specify a gradient of colours to be drawn in the background of the CLabel. | |
| 631 * <p>For example, to draw a gradient that varies from dark blue to white in the vertical, | |
| 632 * direction use the following call | |
| 633 * to setBackground:</p> | |
| 634 * <pre> | |
| 635 * clabel.setBackground(new Color[]{display.getSystemColor(DWT.COLOR_DARK_BLUE), | |
| 636 * display.getSystemColor(DWT.COLOR_WHITE)}, | |
| 637 * new int[] {100}, true); | |
| 638 * </pre> | |
| 639 * | |
| 640 * @param colors an array of Color that specifies the colors to appear in the gradient | |
| 641 * in order of appearance from left/top to right/bottom; The value <code>null</code> | |
| 642 * clears the background gradient; the value <code>null</code> can be used | |
| 643 * inside the array of Color to specify the background color. | |
| 644 * @param percents an array of integers between 0 and 100 specifying the percent of the width/height | |
| 645 * of the widget at which the color should change; the size of the percents | |
| 646 * array must be one less than the size of the colors array. | |
| 647 * @param vertical indicate the direction of the gradient. True is vertical and false is horizontal. | |
| 648 * | |
| 649 * @exception DWTException <ul> | |
| 650 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> | |
| 651 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> | |
| 652 * <li>ERROR_INVALID_ARGUMENT - if the values of colors and percents are not consistent</li> | |
| 653 * </ul> | |
| 654 * | |
| 655 * @since 3.0 | |
| 656 */ | |
| 657 public void setBackground(Color[] colors, int[] percents, bool vertical) { | |
| 658 checkWidget(); | |
| 659 if (colors !is null) { | |
| 660 if (percents is null || percents.length !is colors.length - 1) { | |
| 661 DWT.error(DWT.ERROR_INVALID_ARGUMENT); | |
| 662 } | |
| 663 if (getDisplay().getDepth() < 15) { | |
| 664 // Don't use gradients on low color displays | |
| 665 colors = [colors[colors.length - 1]]; | |
| 666 percents = null; | |
| 667 } | |
| 668 for (int i = 0; i < percents.length; i++) { | |
| 669 if (percents[i] < 0 || percents[i] > 100) { | |
| 670 DWT.error(DWT.ERROR_INVALID_ARGUMENT); | |
| 671 } | |
| 672 if (i > 0 && percents[i] < percents[i-1]) { | |
| 673 DWT.error(DWT.ERROR_INVALID_ARGUMENT); | |
| 674 } | |
| 675 } | |
| 676 } | |
| 677 | |
| 678 // Are these settings the same as before? | |
| 679 final Color background = getBackground(); | |
| 680 if (backgroundImage is null) { | |
| 681 if ((gradientColors !is null) && (colors !is null) && | |
| 682 (gradientColors.length is colors.length)) { | |
| 683 bool same = false; | |
| 684 for (int i = 0; i < gradientColors.length; i++) { | |
| 685 same = (gradientColors[i] is colors[i]) || | |
| 686 ((gradientColors[i] is null) && (colors[i] is background)) || | |
| 687 ((gradientColors[i] is background) && (colors[i] is null)); | |
| 688 if (!same) break; | |
| 689 } | |
| 690 if (same) { | |
| 691 for (int i = 0; i < gradientPercents.length; i++) { | |
| 692 same = gradientPercents[i] is percents[i]; | |
| 693 if (!same) break; | |
| 694 } | |
| 695 } | |
| 696 if (same && this.gradientVertical is vertical) return; | |
| 697 } | |
| 698 } else { | |
| 699 backgroundImage = null; | |
| 700 } | |
| 701 // Store the new settings | |
| 702 if (colors is null) { | |
| 703 gradientColors = null; | |
| 704 gradientPercents = null; | |
| 705 gradientVertical = false; | |
| 706 } else { | |
| 707 gradientColors = new Color[colors.length]; | |
| 708 for (int i = 0; i < colors.length; ++i) | |
| 709 gradientColors[i] = (colors[i] !is null) ? colors[i] : background; | |
| 710 gradientPercents = new int[percents.length]; | |
| 711 for (int i = 0; i < percents.length; ++i) | |
| 712 gradientPercents[i] = percents[i]; | |
| 713 gradientVertical = vertical; | |
| 714 } | |
| 715 // Refresh with the new settings | |
| 716 redraw(); | |
| 717 } | |
| 718 /** | |
| 719 * Set the image to be drawn in the background of the label. | |
| 720 * | |
| 721 * @param image the image to be drawn in the background | |
| 722 * | |
| 723 * @exception DWTException <ul> | |
| 724 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> | |
| 725 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> | |
| 726 * </ul> | |
| 727 */ | |
| 728 public void setBackground(Image image) { | |
| 729 checkWidget(); | |
| 730 if (image is backgroundImage) return; | |
| 731 if (image !is null) { | |
| 732 gradientColors = null; | |
| 733 gradientPercents = null; | |
| 734 } | |
| 735 backgroundImage = image; | |
| 736 redraw(); | |
| 737 | |
| 738 } | |
| 739 public override void setFont(Font font) { | |
| 740 super.setFont(font); | |
| 741 redraw(); | |
| 742 } | |
| 743 /** | |
| 744 * Set the label's Image. | |
| 745 * The value <code>null</code> clears it. | |
| 746 * | |
| 747 * @param image the image to be displayed in the label or null | |
| 748 * | |
| 749 * @exception DWTException <ul> | |
| 750 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> | |
| 751 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> | |
| 752 * </ul> | |
| 753 */ | |
| 754 public void setImage(Image image) { | |
| 755 checkWidget(); | |
| 756 if (image !is this.image) { | |
| 757 this.image = image; | |
| 758 redraw(); | |
| 759 } | |
| 760 } | |
| 761 /** | |
| 762 * Set the label's text. | |
| 763 * The value <code>null</code> clears it. | |
| 764 * | |
| 765 * @param text the text to be displayed in the label or null | |
| 766 * | |
| 767 * @exception DWTException <ul> | |
| 768 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> | |
| 769 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> | |
| 770 * </ul> | |
| 771 */ | |
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772 public void setText(String text) { |
| 155 | 773 checkWidget(); |
| 774 if (text is null) text = ""; //$NON-NLS-1$ | |
| 775 if ( text !=/*eq*/ this.text) { | |
| 776 this.text = text; | |
| 777 redraw(); | |
| 778 } | |
| 779 } | |
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780 public override void setToolTipText (String string) { |
| 155 | 781 super.setToolTipText (string); |
| 782 appToolTipText = super.getToolTipText(); | |
| 783 } | |
| 784 /** | |
| 785 * Shorten the given text <code>t</code> so that its length doesn't exceed | |
| 786 * the given width. The default implementation replaces characters in the | |
| 787 * center of the original string with an ellipsis ("..."). | |
| 788 * Override if you need a different strategy. | |
| 789 * | |
| 790 * @param gc the gc to use for text measurement | |
| 791 * @param t the text to shorten | |
| 792 * @param width the width to shorten the text to, in pixels | |
| 793 * @return the shortened text | |
| 794 */ | |
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795 protected String shortenText(GC gc, String t, int width) { |
| 155 | 796 if (t is null) return null; |
| 797 int w = gc.textExtent(ELLIPSIS, DRAW_FLAGS).x; | |
| 798 if (width<=w) return t; | |
| 799 int l = t.length; | |
| 800 int max = l/2; | |
| 801 int min = 0; | |
| 802 int mid = (max+min)/2 - 1; | |
| 803 if (mid <= 0) return t; | |
| 213 | 804 TextLayout layout = new TextLayout (getDisplay()); |
| 805 layout.setText(t); | |
| 806 mid = validateOffset(layout, mid); | |
| 155 | 807 while (min < mid && mid < max) { |
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808 String s1 = t[0 .. mid].dup; |
| 213 | 809 String s2 = t.substring(validateOffset(layout, l-mid), l); |
| 155 | 810 int l1 = gc.textExtent(s1, DRAW_FLAGS).x; |
| 811 int l2 = gc.textExtent(s2, DRAW_FLAGS).x; | |
| 812 if (l1+w+l2 > width) { | |
| 813 max = mid; | |
| 213 | 814 mid = validateOffset(layout, (max+min)/2); |
| 155 | 815 } else if (l1+w+l2 < width) { |
| 816 min = mid; | |
| 213 | 817 mid = validateOffset(layout, (max+min)/2); |
| 155 | 818 } else { |
| 819 min = max; | |
| 820 } | |
| 821 } | |
| 213 | 822 String result = mid is 0 ? t : t.substring(0, mid) ~ ELLIPSIS ~ t.substring(validateOffset(layout, l-mid), l); |
| 823 layout.dispose(); | |
| 824 return result; | |
| 155 | 825 } |
| 213 | 826 int validateOffset(TextLayout layout, int offset) { |
| 827 int nextOffset = layout.getNextOffset(offset, DWT.MOVEMENT_CLUSTER); | |
| 828 if (nextOffset !is offset) return layout.getPreviousOffset(nextOffset, DWT.MOVEMENT_CLUSTER); | |
| 829 return offset; | |
| 830 } | |
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831 private String[] splitString(String text) { |
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832 String[] lines = new String[1]; |
| 155 | 833 int start = 0, pos; |
| 834 do { | |
| 835 pos = tango.text.Util.locate( text, '\n', start); | |
| 836 if (pos is text.length ) { | |
| 837 lines[lines.length - 1] = text[start .. $ ]; | |
| 838 } else { | |
| 839 bool crlf = (pos > 0) && (text[ pos - 1 ] is '\r'); | |
| 840 lines[lines.length - 1] = text[ start .. pos - (crlf ? 1 : 0)]; | |
| 841 start = pos + 1; | |
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842 String[] newLines = new String[lines.length+1]; |
| 155 | 843 System.arraycopy(lines, 0, newLines, 0, lines.length); |
| 844 lines = newLines; | |
| 845 } | |
| 846 } while (pos !is text.length); | |
| 847 return lines; | |
| 848 } | |
| 849 } |