1 /*
2 * Copyright (c) 2011, 2016, 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 * To change this template, choose Tools | Templates
28 * and open the template in the editor.
29 */
30
31 package com.sun.javafx.scene.control.skin;
32
33 import com.sun.javafx.scene.NodeHelper;
34 import com.sun.javafx.scene.control.behavior.TextBinding;
35 import com.sun.javafx.scene.text.TextLayout;
36 import com.sun.javafx.tk.Toolkit;
37 import javafx.application.ConditionalFeature;
38 import javafx.application.Platform;
39 import javafx.beans.InvalidationListener;
40 import javafx.beans.Observable;
41 import javafx.beans.value.ObservableValue;
42 import javafx.collections.ObservableList;
43 import javafx.geometry.Bounds;
44 import javafx.geometry.HPos;
45 import javafx.geometry.Point2D;
46 import javafx.geometry.VPos;
47 import javafx.scene.Scene;
48 import javafx.scene.control.ContextMenu;
49 import javafx.scene.control.MenuItem;
50 import javafx.scene.control.OverrunStyle;
51 import com.sun.javafx.scene.control.ContextMenuContent;
52 import com.sun.javafx.scene.text.FontHelper;
53 import java.net.URL;
54 import javafx.scene.input.KeyCombination;
55 import javafx.scene.input.Mnemonic;
56 import javafx.scene.paint.Color;
57 import javafx.scene.text.Font;
58 import javafx.scene.text.Text;
59 import javafx.scene.text.TextBoundsType;
60 import javafx.scene.text.HitInfo;
61
62 import java.text.Bidi;
63 import java.util.Locale;
64 import java.util.function.Consumer;
65
66 import static javafx.scene.control.OverrunStyle.CENTER_ELLIPSIS;
67 import static javafx.scene.control.OverrunStyle.CENTER_WORD_ELLIPSIS;
68 import static javafx.scene.control.OverrunStyle.CLIP;
69 import static javafx.scene.control.OverrunStyle.ELLIPSIS;
70 import static javafx.scene.control.OverrunStyle.LEADING_ELLIPSIS;
71 import static javafx.scene.control.OverrunStyle.LEADING_WORD_ELLIPSIS;
72 import static javafx.scene.control.OverrunStyle.WORD_ELLIPSIS;
73
74 /**
75 * BE REALLY CAREFUL WITH RESTORING OR RESETTING STATE OF helper NODE AS LEFTOVER
76 * STATE CAUSES REALLY ODD NASTY BUGS!
77 *
78 * We expect all methods to set the Font property of helper but other than that
79 * any properties set should be restored to defaults.
80 */
81 public class Utils {
82
83 static final Text helper = new Text();
84 static final double DEFAULT_WRAPPING_WIDTH = helper.getWrappingWidth();
85 static final double DEFAULT_LINE_SPACING = helper.getLineSpacing();
86 static final String DEFAULT_TEXT = helper.getText();
87 static final TextBoundsType DEFAULT_BOUNDS_TYPE = helper.getBoundsType();
88
89 /* Using TextLayout directly for simple text measurement.
90 * Instead of restoring the TextLayout attributes to default values
91 * (each renders the TextLayout unable to efficiently cache layout data).
92 * It always sets all the attributes pertinent to calculation being performed.
93 * Note that lineSpacing and boundsType are important when computing the height
94 * but irrelevant when computing the width.
95 *
96 * Note: This code assumes that TextBoundsType#VISUAL is never used by controls.
97 * */
98 static final TextLayout layout = Toolkit.getToolkit().getTextLayoutFactory().createLayout();
99
100 public static double getAscent(Font font, TextBoundsType boundsType) {
101 layout.setContent("", FontHelper.getNativeFont(font));
102 layout.setWrapWidth(0);
103 layout.setLineSpacing(0);
104 if (boundsType == TextBoundsType.LOGICAL_VERTICAL_CENTER) {
105 layout.setBoundsType(TextLayout.BOUNDS_CENTER);
106 } else {
107 layout.setBoundsType(0);
108 }
109 return -layout.getBounds().getMinY();
110 }
111
112 public static double getLineHeight(Font font, TextBoundsType boundsType) {
113 layout.setContent("", FontHelper.getNativeFont(font));
114 layout.setWrapWidth(0);
115 layout.setLineSpacing(0);
116 if (boundsType == TextBoundsType.LOGICAL_VERTICAL_CENTER) {
117 layout.setBoundsType(TextLayout.BOUNDS_CENTER);
118 } else {
119 layout.setBoundsType(0);
120 }
121
122 // RT-37092: Use the line bounds specifically, to include font leading.
123 return layout.getLines()[0].getBounds().getHeight();
124 }
125
126 public static double computeTextWidth(Font font, String text, double wrappingWidth) {
127 layout.setContent(text != null ? text : "", FontHelper.getNativeFont(font));
128 layout.setWrapWidth((float)wrappingWidth);
129 return layout.getBounds().getWidth();
130 }
131
132 public static double computeTextHeight(Font font, String text, double wrappingWidth, TextBoundsType boundsType) {
133 return computeTextHeight(font, text, wrappingWidth, 0, boundsType);
134 }
135
136 @SuppressWarnings("deprecation")
137 public static double computeTextHeight(Font font, String text, double wrappingWidth, double lineSpacing, TextBoundsType boundsType) {
138 layout.setContent(text != null ? text : "", FontHelper.getNativeFont(font));
139 layout.setWrapWidth((float)wrappingWidth);
140 layout.setLineSpacing((float)lineSpacing);
141 if (boundsType == TextBoundsType.LOGICAL_VERTICAL_CENTER) {
142 layout.setBoundsType(TextLayout.BOUNDS_CENTER);
143 } else {
144 layout.setBoundsType(0);
145 }
146 return layout.getBounds().getHeight();
147 }
148
149 public static int computeTruncationIndex(Font font, String text, double width) {
150 helper.setText(text);
151 helper.setFont(font);
152 helper.setWrappingWidth(0);
153 helper.setLineSpacing(0);
154 // The -2 is a fudge to make sure the result more often matches
155 // what we get from using computeTextWidth instead. It's not yet
156 // clear what causes the small discrepancies.
157 Bounds bounds = helper.getLayoutBounds();
158 Point2D endPoint = new Point2D(width - 2, bounds.getMinY() + bounds.getHeight() / 2);
159 final int index = helper.hitTest(endPoint).getCharIndex();
160 // RESTORE STATE
161 helper.setWrappingWidth(DEFAULT_WRAPPING_WIDTH);
162 helper.setLineSpacing(DEFAULT_LINE_SPACING);
163 helper.setText(DEFAULT_TEXT);
164 return index;
165 }
166
167 public static String computeClippedText(Font font, String text, double width,
168 OverrunStyle type, String ellipsisString) {
169 if (font == null) {
170 throw new IllegalArgumentException("Must specify a font");
171 }
172 OverrunStyle style = (type == null || type == CLIP) ? ELLIPSIS : type;
173 final String ellipsis = (type == CLIP) ? "" : ellipsisString;
174 // if the text is empty or null or no ellipsis, then it always fits
175 if (text == null || "".equals(text)) {
176 return text;
177 }
178 // if the string width is < the available width, then it fits and
179 // doesn't need to be clipped. We use a double point comparison
180 // of 0.001 (1/1000th of a pixel) to account for any numerical
181 // discrepancies introduced when the available width was calculated.
182 // MenuItemSkinBase.doLayout, for example, does a number of double
183 // point operations when computing the available width.
184 final double stringWidth = computeTextWidth(font, text, 0);
185 if (stringWidth - width < 0.0010F) {
186 return text;
187 }
188 // the width used by the ellipsis string
189 final double ellipsisWidth = computeTextWidth(font, ellipsis, 0);
190 // the available maximum width to fit chars into. This is essentially
191 // the width minus the space required for the ellipsis string
192 final double availableWidth = width - ellipsisWidth;
193
194 if (width < ellipsisWidth) {
195 // The ellipsis doesn't fit.
196 return "";
197 }
198
199 // if we got here, then we must clip the text with an ellipsis.
200 // this can be pretty expensive depending on whether "complex" text
201 // layout needs to be taken into account. So each ellipsis option has
202 // to take into account two code paths: the easy way and the correct
203 // way. This is flagged by the "complexLayout" boolean
204 // TODO make sure this function call takes into account ligatures, kerning,
205 // and such as that will change the layout characteristics of the text
206 // and will require a full complex layout
207 // TODO since we don't have all the stuff available in FX to determine
208 // complex text, I'm going to for now assume complex text is always false.
209 final boolean complexLayout = false;
210 //requiresComplexLayout(font, text);
211
212 // generally all we want to do is count characters and add their widths.
213 // For ellipsis that breaks on words, we do NOT want to include any
214 // hanging whitespace.
215 if (style == ELLIPSIS ||
216 style == WORD_ELLIPSIS ||
217 style == LEADING_ELLIPSIS ||
218 style == LEADING_WORD_ELLIPSIS) {
219
220 final boolean wordTrim =
221 (style == WORD_ELLIPSIS || style == LEADING_WORD_ELLIPSIS);
222 String substring;
223 if (complexLayout) {
224 // AttributedString a = new AttributedString(text);
225 // LineBreakMeasurer m = new LineBreakMeasurer(a.getIterator(), frc);
226 // substring = text.substring(0, m.nextOffset((double)availableWidth));
227 } else {
228 // RT-23458: Use a faster algorithm for the most common case
229 // where truncation happens at the end, i.e. for ELLIPSIS and
230 // CLIP, but not for other cases such as WORD_ELLIPSIS, etc.
231 if (style == ELLIPSIS && !new Bidi(text, Bidi.DIRECTION_LEFT_TO_RIGHT).isMixed()) {
232 int hit = computeTruncationIndex(font, text, width - ellipsisWidth);
233 if (hit < 0 || hit >= text.length()) {
234 return text;
235 } else {
236 return text.substring(0, hit) + ellipsis;
237 }
238 }
239
240 // simply total up the widths of all chars to determine how many
241 // will fit in the available space. Remember the last whitespace
242 // encountered so that if we're breaking on words we can trim
243 // and omit it.
244 double total = 0.0F;
245 int whitespaceIndex = -1;
246 // at the termination of the loop, index will be one past the
247 // end of the substring
248 int index = 0;
249 int start = (style == LEADING_ELLIPSIS || style == LEADING_WORD_ELLIPSIS) ? (text.length() - 1) : (0);
250 int end = (start == 0) ? (text.length() - 1) : 0;
251 int stepValue = (start == 0) ? 1 : -1;
252 boolean done = (start == 0) ? start > end : start < end;
253 for (int i = start; !done ; i += stepValue) {
254 index = i;
255 char c = text.charAt(index);
256 total = computeTextWidth(font,
257 (start == 0) ? text.substring(0, i + 1)
258 : text.substring(i, start + 1),
259 0);
260 if (Character.isWhitespace(c)) {
261 whitespaceIndex = index;
262 }
263 if (total > availableWidth) {
264 break;
265 }
266 done = start == 0? i >= end : i <= end;
267 }
268 final boolean fullTrim = !wordTrim || whitespaceIndex == -1;
269 substring = (start == 0) ?
270 (text.substring(0, fullTrim ? index : whitespaceIndex)) :
271 (text.substring((fullTrim ? index : whitespaceIndex) + 1));
272 assert(!text.equals(substring));
273 }
274 if (style == ELLIPSIS || style == WORD_ELLIPSIS) {
275 return substring + ellipsis;
276 } else {
277 //style is LEADING_ELLIPSIS or LEADING_WORD_ELLIPSIS
278 return ellipsis + substring;
279 }
280 } else {
281 // these two indexes are INCLUSIVE not exclusive
282 int leadingIndex = 0;
283 int trailingIndex = 0;
284 int leadingWhitespace = -1;
285 int trailingWhitespace = -1;
286 // The complex case is going to be killer. What I have to do is
287 // read all the chars from the left up to the leadingIndex,
288 // and all the chars from the right up to the trailingIndex,
289 // and sum those together to get my total. That is, I cannot have
290 // a running total but must retotal the cummulative chars each time
291 if (complexLayout) {
292 } else /* double leadingTotal = 0;
293 double trailingTotal = 0;
294 for (int i=0; i<text.length(); i++) {
295 double total = computeStringWidth(metrics, text.substring(0, i));
296 if (total + trailingTotal > availableWidth) break;
297 leadingIndex = i;
298 leadingTotal = total;
299 if (Character.isWhitespace(text.charAt(i))) leadingWhitespace = leadingIndex;
300
301 int index = text.length() - (i + 1);
302 total = computeStringWidth(metrics, text.substring(index - 1));
303 if (total + leadingTotal > availableWidth) break;
304 trailingIndex = index;
305 trailingTotal = total;
306 if (Character.isWhitespace(text.charAt(index))) trailingWhitespace = trailingIndex;
307 }*/
308 {
309 // either CENTER_ELLIPSIS or CENTER_WORD_ELLIPSIS
310 // for this case I read one char on the left, then one on the end
311 // then second on the left, then second from the end, etc until
312 // I have used up all the availableWidth. At that point, I trim
313 // the string twice: once from the start to firstIndex, and
314 // once from secondIndex to the end. I then insert the ellipsis
315 // between the two.
316 leadingIndex = -1;
317 trailingIndex = -1;
318 double total = 0.0F;
319 for (int i = 0; i <= text.length() - 1; i++) {
320 char c = text.charAt(i);
321 //total += metrics.charWidth(c);
322 total += computeTextWidth(font, "" + c, 0);
323 if (total > availableWidth) {
324 break;
325 }
326 leadingIndex = i;
327 if (Character.isWhitespace(c)) {
328 leadingWhitespace = leadingIndex;
329 }
330 int index = text.length() - 1 - i;
331 c = text.charAt(index);
332 //total += metrics.charWidth(c);
333 total += computeTextWidth(font, "" + c, 0);
334 if (total > availableWidth) {
335 break;
336 }
337 trailingIndex = index;
338 if (Character.isWhitespace(c)) {
339 trailingWhitespace = trailingIndex;
340 }
341 }
342 }
343 if (leadingIndex < 0) {
344 return ellipsis;
345 }
346 if (style == CENTER_ELLIPSIS) {
347 if (trailingIndex < 0) {
348 return text.substring(0, leadingIndex + 1) + ellipsis;
349 }
350 return text.substring(0, leadingIndex + 1) + ellipsis + text.substring(trailingIndex);
351 } else {
352 boolean leadingIndexIsLastLetterInWord =
353 Character.isWhitespace(text.charAt(leadingIndex + 1));
354 int index = (leadingWhitespace == -1 || leadingIndexIsLastLetterInWord) ? (leadingIndex + 1) : (leadingWhitespace);
355 String leading = text.substring(0, index);
356 if (trailingIndex < 0) {
357 return leading + ellipsis;
358 }
359 boolean trailingIndexIsFirstLetterInWord =
360 Character.isWhitespace(text.charAt(trailingIndex - 1));
361 index = (trailingWhitespace == -1 || trailingIndexIsFirstLetterInWord) ? (trailingIndex) : (trailingWhitespace + 1);
362 String trailing = text.substring(index);
363 return leading + ellipsis + trailing;
364 }
365 }
366 }
367
368 public static String computeClippedWrappedText(Font font, String text, double width,
369 double height, OverrunStyle truncationStyle,
370 String ellipsisString, TextBoundsType boundsType) {
371 if (font == null) {
372 throw new IllegalArgumentException("Must specify a font");
373 }
374
375 String ellipsis = (truncationStyle == CLIP) ? "" : ellipsisString;
376 int eLen = ellipsis.length();
377 // Do this before using helper, as it's not reentrant.
378 double eWidth = computeTextWidth(font, ellipsis, 0);
379 double eHeight = computeTextHeight(font, ellipsis, 0, boundsType);
380
381 if (width < eWidth || height < eHeight) {
382 // The ellipsis doesn't fit.
383 return text; // RT-30868 - return text, not empty string.
384 }
385
386 helper.setText(text);
387 helper.setFont(font);
388 helper.setWrappingWidth((int)Math.ceil(width));
389 helper.setBoundsType(boundsType);
390 helper.setLineSpacing(0);
391
392 boolean leading = (truncationStyle == LEADING_ELLIPSIS ||
393 truncationStyle == LEADING_WORD_ELLIPSIS);
394 boolean center = (truncationStyle == CENTER_ELLIPSIS ||
395 truncationStyle == CENTER_WORD_ELLIPSIS);
396 boolean trailing = !(leading || center);
397 boolean wordTrim = (truncationStyle == WORD_ELLIPSIS ||
398 truncationStyle == LEADING_WORD_ELLIPSIS ||
399 truncationStyle == CENTER_WORD_ELLIPSIS);
400
401 String result = text;
402 int len = (result != null) ? result.length() : 0;
403 int centerLen = -1;
404
405 Point2D centerPoint = null;
406 if (center) {
407 // Find index of character in the middle of the visual text area
408 centerPoint = new Point2D((width - eWidth) / 2, height / 2 - helper.getBaselineOffset());
409 }
410
411 // Find index of character at the bottom left of the text area.
412 // This should be the first character of a line that would be clipped.
413 Point2D endPoint = new Point2D(0, height - helper.getBaselineOffset());
414
415 int hit = helper.hitTest(endPoint).getCharIndex();
416 if (hit >= len) {
417 helper.setBoundsType(TextBoundsType.LOGICAL); // restore
418 return text;
419 }
420 if (center) {
421 hit = helper.hitTest(centerPoint).getCharIndex();
422 }
423
424 if (hit > 0 && hit < len) {
425 // Step one, make a truncation estimate.
426
427 if (center || trailing) {
428 int ind = hit;
429 if (center) {
430 // This is for the first part, i.e. beginning of text up to ellipsis.
431 if (wordTrim) {
432 int brInd = lastBreakCharIndex(text, ind + 1);
433 if (brInd >= 0) {
434 ind = brInd + 1;
435 } else {
436 brInd = firstBreakCharIndex(text, ind);
437 if (brInd >= 0) {
438 ind = brInd + 1;
439 }
440 }
441 }
442 centerLen = ind + eLen;
443 } // else: text node wraps at words, so wordTrim is not needed here.
444 result = result.substring(0, ind) + ellipsis;
445 }
446
447 if (leading || center) {
448 // The hit is an index counted from the beginning, but we need
449 // the opposite, i.e. an index counted from the end. However,
450 // the Text node does not support wrapped line layout in the
451 // reverse direction, starting at the bottom right corner.
452
453 // We'll simulate by assuming the index will be a similar
454 // number, then back up 10 characters just to add some slop.
455 // For example, the ending lines might pack tighter than the
456 // beginning lines, and therefore fit a higher number of
457 // characters.
458 int ind = Math.max(0, len - hit - 10);
459 if (ind > 0 && wordTrim) {
460 int brInd = lastBreakCharIndex(text, ind + 1);
461 if (brInd >= 0) {
462 ind = brInd + 1;
463 } else {
464 brInd = firstBreakCharIndex(text, ind);
465 if (brInd >= 0) {
466 ind = brInd + 1;
467 }
468 }
469 }
470 if (center) {
471 // This is for the second part, i.e. from ellipsis to end of text.
472 result = result + text.substring(ind);
473 } else {
474 result = ellipsis + text.substring(ind);
475 }
476 }
477
478 // Step two, check if text still overflows after we added the ellipsis.
479 // If so, remove one char or word at a time.
480 while (true) {
481 helper.setText(result);
482 int hit2 = helper.hitTest(endPoint).getCharIndex();
483 if (center && hit2 < centerLen) {
484 // No room for text after ellipsis. Maybe there is a newline
485 // here, and the next line falls outside the view.
486 if (hit2 > 0 && result.charAt(hit2-1) == '\n') {
487 hit2--;
488 }
489 result = text.substring(0, hit2) + ellipsis;
490 break;
491 } else if (hit2 > 0 && hit2 < result.length()) {
492 if (leading) {
493 int ind = eLen + 1; // Past ellipsis and first char.
494 if (wordTrim) {
495 int brInd = firstBreakCharIndex(result, ind);
496 if (brInd >= 0) {
497 ind = brInd + 1;
498 }
499 }
500 result = ellipsis + result.substring(ind);
501 } else if (center) {
502 int ind = centerLen + 1; // Past ellipsis and first char.
503 if (wordTrim) {
504 int brInd = firstBreakCharIndex(result, ind);
505 if (brInd >= 0) {
506 ind = brInd + 1;
507 }
508 }
509 result = result.substring(0, centerLen) + result.substring(ind);
510 } else {
511 int ind = result.length() - eLen - 1; // Before last char and ellipsis.
512 if (wordTrim) {
513 int brInd = lastBreakCharIndex(result, ind);
514 if (brInd >= 0) {
515 ind = brInd;
516 }
517 }
518 result = result.substring(0, ind) + ellipsis;
519 }
520 } else {
521 break;
522 }
523 }
524 }
525 // RESTORE STATE
526 helper.setWrappingWidth(DEFAULT_WRAPPING_WIDTH);
527 helper.setLineSpacing(DEFAULT_LINE_SPACING);
528 helper.setText(DEFAULT_TEXT);
529 helper.setBoundsType(DEFAULT_BOUNDS_TYPE);
530 return result;
531 }
532
533
534 private static int firstBreakCharIndex(String str, int start) {
535 char[] chars = str.toCharArray();
536 for (int i = start; i < chars.length; i++) {
537 if (isPreferredBreakCharacter(chars[i])) {
538 return i;
539 }
540 }
541 return -1;
542 }
543
544 private static int lastBreakCharIndex(String str, int start) {
545 char[] chars = str.toCharArray();
546 for (int i = start; i >= 0; i--) {
547 if (isPreferredBreakCharacter(chars[i])) {
548 return i;
549 }
550 }
551 return -1;
552 }
553
554 /* Recognizes white space and latin punctuation as preferred
555 * line break positions. Could do a bit better with using more
556 * of the properties from the Character class.
557 */
558 private static boolean isPreferredBreakCharacter(char ch) {
559 if (Character.isWhitespace(ch)) {
560 return true;
561 } else {
562 switch (ch) {
563 case ';' :
564 case ':' :
565 case '.' :
566 return true;
567 default: return false;
568 }
569 }
570 }
571
572 private static boolean requiresComplexLayout(Font font, String string) {
573 /* Map attrs = font.getAttributes();
574 if (contains(attrs, KERNING, KERNING_ON) ||
575 contains(attrs, LIGATURES, LIGATURES_ON) ||
576 (attrs.containsKey(TRACKING) && attrs.get(TRACKING) != null)) {
577 return true;
578 }
579 return isComplexLayout(string.toCharArray(), 0, string.length());
580 */
581 return false;
582 }
583
584 static int computeStartOfWord(Font font, String text, int index) {
585 if ("".equals(text) || index < 0) return 0;
586 if (text.length() <= index) return text.length();
587 // if the given index is not in a word (but in whitespace), then
588 // simply return the index
589 if (Character.isWhitespace(text.charAt(index))) {
590 return index;
591 }
592 boolean complexLayout = requiresComplexLayout(font, text);
593 if (complexLayout) {
594 // TODO needs implementation
595 return 0;
596 } else {
597 // just start walking backwards from index until either i<0 or
598 // the first whitespace is found.
599 int i = index;
600 while (--i >= 0) {
601 if (Character.isWhitespace(text.charAt(i))) {
602 return i + 1;
603 }
604 }
605 return 0;
606 }
607 }
608
609 static int computeEndOfWord(Font font, String text, int index) {
610 if (text.equals("") || index < 0) {
611 return 0;
612 }
613 if (text.length() <= index) {
614 return text.length();
615 }
616 // if the given index is not in a word (but in whitespace), then
617 // simply return the index
618 if (Character.isWhitespace(text.charAt(index))) {
619 return index;
620 }
621 boolean complexLayout = requiresComplexLayout(font, text);
622 if (complexLayout) {
623 // TODO needs implementation
624 return text.length();
625 } else {
626 // just start walking forward from index until either i > length or
627 // the first whitespace is found.
628 int i = index;
629 while (++i < text.length()) {
630 if (Character.isWhitespace(text.charAt(i))) {
631 return i;
632 }
633 }
634 return text.length();
635 }
636 }
637
638 // used for layout to adjust widths to honor the min/max policies consistently
639 public static double boundedSize(double value, double min, double max) {
640 // if max < value, return max
641 // if min > value, return min
642 // if min > max, return min
643 return Math.min(Math.max(value, min), Math.max(min,max));
644 }
645
646 public static void addMnemonics(ContextMenu popup, Scene scene) {
647 addMnemonics(popup, scene, false);
648 }
649
650 public static void addMnemonics(ContextMenu popup, Scene scene, boolean initialState) {
651
652 if (!com.sun.javafx.PlatformUtil.isMac()) {
653
654 ContextMenuContent cmContent = (ContextMenuContent)popup.getSkin().getNode();
655 MenuItem menuitem;
656
657 for (int i = 0 ; i < popup.getItems().size() ; i++) {
658 menuitem = popup.getItems().get(i);
659 /*
660 ** check is there are any mnemonics in this menu
661 */
662 if (menuitem.isMnemonicParsing()) {
663
664 TextBinding bindings = new TextBinding(menuitem.getText());
665 int mnemonicIndex = bindings.getMnemonicIndex() ;
666 if (mnemonicIndex >= 0) {
667 KeyCombination mnemonicKeyCombo = bindings.getMnemonicKeyCombination();
668 Mnemonic myMnemonic = new Mnemonic(cmContent.getLabelAt(i), mnemonicKeyCombo);
669 scene.addMnemonic(myMnemonic);
670 NodeHelper.setShowMnemonics(cmContent.getLabelAt(i), initialState);
671 }
672 }
673 }
674 }
675 }
676
677
678
679 public static void removeMnemonics(ContextMenu popup, Scene scene) {
680
681 if (!com.sun.javafx.PlatformUtil.isMac()) {
682
683 ContextMenuContent cmContent = (ContextMenuContent)popup.getSkin().getNode();
684 MenuItem menuitem;
685
686 for (int i = 0 ; i < popup.getItems().size() ; i++) {
687 menuitem = popup.getItems().get(i);
688 /*
689 ** check is there are any mnemonics in this menu
690 */
691 if (menuitem.isMnemonicParsing()) {
692
693 TextBinding bindings = new TextBinding(menuitem.getText());
694 int mnemonicIndex = bindings.getMnemonicIndex() ;
695 if (mnemonicIndex >= 0) {
696 KeyCombination mnemonicKeyCombo = bindings.getMnemonicKeyCombination();
697
698 ObservableList<Mnemonic> mnemonicsList = scene.getMnemonics().get(mnemonicKeyCombo);
699 if (mnemonicsList != null) {
700 for (int j = 0 ; j < mnemonicsList.size() ; j++) {
701 if (mnemonicsList.get(j).getNode() == cmContent.getLabelAt(i)) {
702 mnemonicsList.remove(j);
703 }
704 }
705 }
706 }
707 }
708 }
709 }
710 }
711
712 public static double computeXOffset(double width, double contentWidth, HPos hpos) {
713 if (hpos == null) {
714 return 0;
715 }
716
717 switch(hpos) {
718 case LEFT:
719 return 0;
720 case CENTER:
721 return (width - contentWidth) / 2;
722 case RIGHT:
723 return width - contentWidth;
724 default:
725 return 0;
726 }
727 }
728
729 public static double computeYOffset(double height, double contentHeight, VPos vpos) {
730 if (vpos == null) {
731 return 0;
732 }
733
734 switch(vpos) {
735 case TOP:
736 return 0;
737 case CENTER:
738 return (height - contentHeight) / 2;
739 case BOTTOM:
740 return height - contentHeight;
741 default:
742 return 0;
743 }
744 }
745
746 /*
747 ** Returns true if the platform is to use Two-Level-Focus.
748 ** This is in the Util class to ease any changes in
749 ** the criteria for enabling this feature.
750 **
751 ** TwoLevelFocus is needed on platforms that
752 ** only support 5-button navigation (arrow keys and Select/OK).
753 **
754 */
755 public static boolean isTwoLevelFocus() {
756 return Platform.isSupported(ConditionalFeature.TWO_LEVEL_FOCUS);
757 }
758
759
760 // useful method for linking things together when before a property is
761 // necessarily set
762 public static <T> void executeOnceWhenPropertyIsNonNull(ObservableValue<T> p, Consumer<T> consumer) {
763 if (p == null) return;
764
765 T value = p.getValue();
766 if (value != null) {
767 consumer.accept(value);
768 } else {
769 final InvalidationListener listener = new InvalidationListener() {
770 @Override public void invalidated(Observable observable) {
771 T value = p.getValue();
772
773 if (value != null) {
774 p.removeListener(this);
775 consumer.accept(value);
776 }
777 }
778 };
779 p.addListener(listener);
780 }
781 }
782
783 public static String formatHexString(Color c) {
784 if (c != null) {
785 return String.format((Locale) null, "#%02x%02x%02x",
786 Math.round(c.getRed() * 255),
787 Math.round(c.getGreen() * 255),
788 Math.round(c.getBlue() * 255));
789 } else {
790 return null;
791 }
792 }
793
794 public static URL getResource(String str) {
795 return Utils.class.getResource(str);
796 }
797
798 }