2 * Copyright (C) 2006 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 import android.annotation.IntDef;
20 import android.annotation.IntRange;
21 import android.annotation.UnsupportedAppUsage;
22 import android.graphics.Canvas;
23 import android.graphics.Paint;
24 import android.graphics.Path;
25 import android.graphics.Rect;
26 import android.graphics.text.LineBreaker;
27 import android.text.method.TextKeyListener;
28 import android.text.style.AlignmentSpan;
29 import android.text.style.LeadingMarginSpan;
30 import android.text.style.LeadingMarginSpan.LeadingMarginSpan2;
31 import android.text.style.LineBackgroundSpan;
32 import android.text.style.ParagraphStyle;
33 import android.text.style.ReplacementSpan;
34 import android.text.style.TabStopSpan;
36 import com.android.internal.annotations.VisibleForTesting;
37 import com.android.internal.util.ArrayUtils;
38 import com.android.internal.util.GrowingArrayUtils;
40 import java.lang.annotation.Retention;
41 import java.lang.annotation.RetentionPolicy;
42 import java.util.Arrays;
45 * A base class that manages text layout in visual elements on
47 * <p>For text that will be edited, use a {@link DynamicLayout},
48 * which will be updated as the text changes.
49 * For text that will not change, use a {@link StaticLayout}.
51 public abstract class Layout {
53 @IntDef(prefix = { "BREAK_STRATEGY_" }, value = {
54 LineBreaker.BREAK_STRATEGY_SIMPLE,
55 LineBreaker.BREAK_STRATEGY_HIGH_QUALITY,
56 LineBreaker.BREAK_STRATEGY_BALANCED
58 @Retention(RetentionPolicy.SOURCE)
59 public @interface BreakStrategy {}
62 * Value for break strategy indicating simple line breaking. Automatic hyphens are not added
63 * (though soft hyphens are respected), and modifying text generally doesn't affect the layout
64 * before it (which yields a more consistent user experience when editing), but layout may not
65 * be the highest quality.
67 public static final int BREAK_STRATEGY_SIMPLE = LineBreaker.BREAK_STRATEGY_SIMPLE;
70 * Value for break strategy indicating high quality line breaking, including automatic
71 * hyphenation and doing whole-paragraph optimization of line breaks.
73 public static final int BREAK_STRATEGY_HIGH_QUALITY = LineBreaker.BREAK_STRATEGY_HIGH_QUALITY;
76 * Value for break strategy indicating balanced line breaking. The breaks are chosen to
77 * make all lines as close to the same length as possible, including automatic hyphenation.
79 public static final int BREAK_STRATEGY_BALANCED = LineBreaker.BREAK_STRATEGY_BALANCED;
82 @IntDef(prefix = { "HYPHENATION_FREQUENCY_" }, value = {
83 HYPHENATION_FREQUENCY_NORMAL,
84 HYPHENATION_FREQUENCY_FULL,
85 HYPHENATION_FREQUENCY_NONE
87 @Retention(RetentionPolicy.SOURCE)
88 public @interface HyphenationFrequency {}
91 * Value for hyphenation frequency indicating no automatic hyphenation. Useful
92 * for backward compatibility, and for cases where the automatic hyphenation algorithm results
93 * in incorrect hyphenation. Mid-word breaks may still happen when a word is wider than the
94 * layout and there is otherwise no valid break. Soft hyphens are ignored and will not be used
95 * as suggestions for potential line breaks.
97 public static final int HYPHENATION_FREQUENCY_NONE = LineBreaker.HYPHENATION_FREQUENCY_NONE;
100 * Value for hyphenation frequency indicating a light amount of automatic hyphenation, which
101 * is a conservative default. Useful for informal cases, such as short sentences or chat
104 public static final int HYPHENATION_FREQUENCY_NORMAL = LineBreaker.HYPHENATION_FREQUENCY_NORMAL;
107 * Value for hyphenation frequency indicating the full amount of automatic hyphenation, typical
108 * in typography. Useful for running text and where it's important to put the maximum amount of
109 * text in a screen with limited space.
111 public static final int HYPHENATION_FREQUENCY_FULL = LineBreaker.HYPHENATION_FREQUENCY_FULL;
113 private static final ParagraphStyle[] NO_PARA_SPANS =
114 ArrayUtils.emptyArray(ParagraphStyle.class);
117 @IntDef(prefix = { "JUSTIFICATION_MODE_" }, value = {
118 LineBreaker.JUSTIFICATION_MODE_NONE,
119 LineBreaker.JUSTIFICATION_MODE_INTER_WORD
121 @Retention(RetentionPolicy.SOURCE)
122 public @interface JustificationMode {}
125 * Value for justification mode indicating no justification.
127 public static final int JUSTIFICATION_MODE_NONE = LineBreaker.JUSTIFICATION_MODE_NONE;
130 * Value for justification mode indicating the text is justified by stretching word spacing.
132 public static final int JUSTIFICATION_MODE_INTER_WORD =
133 LineBreaker.JUSTIFICATION_MODE_INTER_WORD;
136 * Line spacing multiplier for default line spacing.
138 public static final float DEFAULT_LINESPACING_MULTIPLIER = 1.0f;
141 * Line spacing addition for default line spacing.
143 public static final float DEFAULT_LINESPACING_ADDITION = 0.0f;
146 * Return how wide a layout must be in order to display the specified text with one line per
150 * {@link TextDirectionHeuristics#FIRSTSTRONG_LTR} as the default text direction heuristics. In
151 * the earlier versions uses {@link TextDirectionHeuristics#LTR} as the default.</p>
153 public static float getDesiredWidth(CharSequence source,
155 return getDesiredWidth(source, 0, source.length(), paint);
159 * Return how wide a layout must be in order to display the specified text slice with one
160 * line per paragraph.
163 * {@link TextDirectionHeuristics#FIRSTSTRONG_LTR} as the default text direction heuristics. In
164 * the earlier versions uses {@link TextDirectionHeuristics#LTR} as the default.</p>
166 public static float getDesiredWidth(CharSequence source, int start, int end, TextPaint paint) {
167 return getDesiredWidth(source, start, end, paint, TextDirectionHeuristics.FIRSTSTRONG_LTR);
171 * Return how wide a layout must be in order to display the
172 * specified text slice with one line per paragraph.
176 public static float getDesiredWidth(CharSequence source, int start, int end, TextPaint paint,
177 TextDirectionHeuristic textDir) {
178 return getDesiredWidthWithLimit(source, start, end, paint, textDir, Float.MAX_VALUE);
181 * Return how wide a layout must be in order to display the
182 * specified text slice with one line per paragraph.
184 * If the measured width exceeds given limit, returns limit value instead.
187 public static float getDesiredWidthWithLimit(CharSequence source, int start, int end,
188 TextPaint paint, TextDirectionHeuristic textDir, float upperLimit) {
192 for (int i = start; i <= end; i = next) {
193 next = TextUtils.indexOf(source, '\n', i, end);
198 // note, omits trailing paragraph char
199 float w = measurePara(paint, source, i, next, textDir);
200 if (w > upperLimit) {
214 * Subclasses of Layout use this constructor to set the display text,
215 * width, and other standard properties.
216 * @param text the text to render
217 * @param paint the default paint for the layout. Styles can override
218 * various attributes of the paint.
219 * @param width the wrapping width for the text.
220 * @param align whether to left, right, or center the text. Styles can
221 * override the alignment.
222 * @param spacingMult factor by which to scale the font size to get the
223 * default line spacing
224 * @param spacingAdd amount to add to the default line spacing
226 protected Layout(CharSequence text, TextPaint paint,
227 int width, Alignment align,
228 float spacingMult, float spacingAdd) {
229 this(text, paint, width, align, TextDirectionHeuristics.FIRSTSTRONG_LTR,
230 spacingMult, spacingAdd);
234 * Subclasses of Layout use this constructor to set the display text,
235 * width, and other standard properties.
236 * @param text the text to render
237 * @param paint the default paint for the layout. Styles can override
238 * various attributes of the paint.
239 * @param width the wrapping width for the text.
240 * @param align whether to left, right, or center the text. Styles can
241 * override the alignment.
242 * @param spacingMult factor by which to scale the font size to get the
243 * default line spacing
244 * @param spacingAdd amount to add to the default line spacing
248 protected Layout(CharSequence text, TextPaint paint,
249 int width, Alignment align, TextDirectionHeuristic textDir,
250 float spacingMult, float spacingAdd) {
253 throw new IllegalArgumentException("Layout: " + width + " < 0");
255 // Ensure paint doesn't have baselineShift set.
256 // While normally we don't modify the paint the user passed in,
257 // we were already doing this in Styled.drawUniformRun with both
258 // baselineShift and bgColor. We probably should reevaluate bgColor.
261 paint.baselineShift = 0;
268 mSpacingMult = spacingMult;
269 mSpacingAdd = spacingAdd;
270 mSpannedText = text instanceof Spanned;
275 protected void setJustificationMode(@JustificationMode int justificationMode) {
276 mJustificationMode = justificationMode;
280 * Replace constructor properties of this Layout with new ones. Be careful.
282 /* package */ void replaceWith(CharSequence text, TextPaint paint,
283 int width, Alignment align,
284 float spacingmult, float spacingadd) {
286 throw new IllegalArgumentException("Layout: " + width + " < 0");
293 mSpacingMult = spacingmult;
294 mSpacingAdd = spacingadd;
295 mSpannedText = text instanceof Spanned;
299 * Draw this Layout on the specified Canvas.
301 public void draw(Canvas c) {
302 draw(c, null, null, 0);
306 * Draw this Layout on the specified canvas, with the highlight path drawn
307 * between the background and the text.
309 * @param canvas the canvas
310 * @param highlight the path of the highlight or cursor; can be null
311 * @param highlightPaint the paint for the highlight
312 * @param cursorOffsetVertical the amount to temporarily translate the
313 * canvas while rendering the highlight
315 public void draw(Canvas canvas, Path highlight, Paint highlightPaint,
316 int cursorOffsetVertical) {
317 final long lineRange = getLineRangeForDraw(canvas);
318 int firstLine = TextUtils.unpackRangeStartFromLong(lineRange);
319 int lastLine = TextUtils.unpackRangeEndFromLong(lineRange);
320 if (lastLine < 0) return;
322 drawBackground(canvas, highlight, highlightPaint, cursorOffsetVertical,
323 firstLine, lastLine);
324 drawText(canvas, firstLine, lastLine);
327 private boolean isJustificationRequired(int lineNum) {
328 if (mJustificationMode == JUSTIFICATION_MODE_NONE) return false;
329 final int lineEnd = getLineEnd(lineNum);
330 return lineEnd < mText.length() && mText.charAt(lineEnd - 1) != '\n';
333 private float getJustifyWidth(int lineNum) {
334 Alignment paraAlign = mAlignment;
339 final int dir = getParagraphDirection(lineNum);
341 ParagraphStyle[] spans = NO_PARA_SPANS;
343 Spanned sp = (Spanned) mText;
344 final int start = getLineStart(lineNum);
346 final boolean isFirstParaLine = (start == 0 || mText.charAt(start - 1) == '\n');
348 if (isFirstParaLine) {
349 final int spanEnd = sp.nextSpanTransition(start, mText.length(),
350 ParagraphStyle.class);
351 spans = getParagraphSpans(sp, start, spanEnd, ParagraphStyle.class);
353 for (int n = spans.length - 1; n >= 0; n--) {
354 if (spans[n] instanceof AlignmentSpan) {
355 paraAlign = ((AlignmentSpan) spans[n]).getAlignment();
361 final int length = spans.length;
362 boolean useFirstLineMargin = isFirstParaLine;
363 for (int n = 0; n < length; n++) {
364 if (spans[n] instanceof LeadingMarginSpan2) {
365 int count = ((LeadingMarginSpan2) spans[n]).getLeadingMarginLineCount();
366 int startLine = getLineForOffset(sp.getSpanStart(spans[n]));
367 if (lineNum < startLine + count) {
368 useFirstLineMargin = true;
373 for (int n = 0; n < length; n++) {
374 if (spans[n] instanceof LeadingMarginSpan) {
375 LeadingMarginSpan margin = (LeadingMarginSpan) spans[n];
376 if (dir == DIR_RIGHT_TO_LEFT) {
377 right -= margin.getLeadingMargin(useFirstLineMargin);
379 left += margin.getLeadingMargin(useFirstLineMargin);
385 final Alignment align;
386 if (paraAlign == Alignment.ALIGN_LEFT) {
387 align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE;
388 } else if (paraAlign == Alignment.ALIGN_RIGHT) {
389 align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL;
394 final int indentWidth;
395 if (align == Alignment.ALIGN_NORMAL) {
396 if (dir == DIR_LEFT_TO_RIGHT) {
397 indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT);
399 indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT);
401 } else if (align == Alignment.ALIGN_OPPOSITE) {
402 if (dir == DIR_LEFT_TO_RIGHT) {
403 indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT);
405 indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT);
407 } else { // Alignment.ALIGN_CENTER
408 indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_CENTER);
411 return right - left - indentWidth;
418 public void drawText(Canvas canvas, int firstLine, int lastLine) {
419 int previousLineBottom = getLineTop(firstLine);
420 int previousLineEnd = getLineStart(firstLine);
421 ParagraphStyle[] spans = NO_PARA_SPANS;
423 final TextPaint paint = mWorkPaint;
425 CharSequence buf = mText;
427 Alignment paraAlign = mAlignment;
428 TabStops tabStops = null;
429 boolean tabStopsIsInitialized = false;
431 TextLine tl = TextLine.obtain();
433 // Draw the lines, one at a time.
434 // The baseline is the top of the following line minus the current line's descent.
435 for (int lineNum = firstLine; lineNum <= lastLine; lineNum++) {
436 int start = previousLineEnd;
437 previousLineEnd = getLineStart(lineNum + 1);
438 final boolean justify = isJustificationRequired(lineNum);
439 int end = getLineVisibleEnd(lineNum, start, previousLineEnd);
440 paint.setStartHyphenEdit(getStartHyphenEdit(lineNum));
441 paint.setEndHyphenEdit(getEndHyphenEdit(lineNum));
443 int ltop = previousLineBottom;
444 int lbottom = getLineTop(lineNum + 1);
445 previousLineBottom = lbottom;
446 int lbaseline = lbottom - getLineDescent(lineNum);
448 int dir = getParagraphDirection(lineNum);
453 Spanned sp = (Spanned) buf;
454 int textLength = buf.length();
455 boolean isFirstParaLine = (start == 0 || buf.charAt(start - 1) == '\n');
457 // New batch of paragraph styles, collect into spans array.
458 // Compute the alignment, last alignment style wins.
459 // Reset tabStops, we'll rebuild if we encounter a line with
461 // We expect paragraph spans to be relatively infrequent, use
462 // spanEnd so that we can check less frequently. Since
463 // paragraph styles ought to apply to entire paragraphs, we can
464 // just collect the ones present at the start of the paragraph.
465 // If spanEnd is before the end of the paragraph, that's not
467 if (start >= spanEnd && (lineNum == firstLine || isFirstParaLine)) {
468 spanEnd = sp.nextSpanTransition(start, textLength,
469 ParagraphStyle.class);
470 spans = getParagraphSpans(sp, start, spanEnd, ParagraphStyle.class);
472 paraAlign = mAlignment;
473 for (int n = spans.length - 1; n >= 0; n--) {
474 if (spans[n] instanceof AlignmentSpan) {
475 paraAlign = ((AlignmentSpan) spans[n]).getAlignment();
480 tabStopsIsInitialized = false;
483 // Draw all leading margin spans. Adjust left or right according
484 // to the paragraph direction of the line.
485 final int length = spans.length;
486 boolean useFirstLineMargin = isFirstParaLine;
487 for (int n = 0; n < length; n++) {
488 if (spans[n] instanceof LeadingMarginSpan2) {
489 int count = ((LeadingMarginSpan2) spans[n]).getLeadingMarginLineCount();
490 int startLine = getLineForOffset(sp.getSpanStart(spans[n]));
491 // if there is more than one LeadingMarginSpan2, use
492 // the count that is greatest
493 if (lineNum < startLine + count) {
494 useFirstLineMargin = true;
499 for (int n = 0; n < length; n++) {
500 if (spans[n] instanceof LeadingMarginSpan) {
501 LeadingMarginSpan margin = (LeadingMarginSpan) spans[n];
502 if (dir == DIR_RIGHT_TO_LEFT) {
503 margin.drawLeadingMargin(canvas, paint, right, dir, ltop,
504 lbaseline, lbottom, buf,
505 start, end, isFirstParaLine, this);
506 right -= margin.getLeadingMargin(useFirstLineMargin);
508 margin.drawLeadingMargin(canvas, paint, left, dir, ltop,
509 lbaseline, lbottom, buf,
510 start, end, isFirstParaLine, this);
511 left += margin.getLeadingMargin(useFirstLineMargin);
517 boolean hasTab = getLineContainsTab(lineNum);
518 // Can't tell if we have tabs for sure, currently
519 if (hasTab && !tabStopsIsInitialized) {
520 if (tabStops == null) {
521 tabStops = new TabStops(TAB_INCREMENT, spans);
523 tabStops.reset(TAB_INCREMENT, spans);
525 tabStopsIsInitialized = true;
528 // Determine whether the line aligns to normal, opposite, or center.
529 Alignment align = paraAlign;
530 if (align == Alignment.ALIGN_LEFT) {
531 align = (dir == DIR_LEFT_TO_RIGHT) ?
532 Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE;
533 } else if (align == Alignment.ALIGN_RIGHT) {
534 align = (dir == DIR_LEFT_TO_RIGHT) ?
535 Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL;
539 final int indentWidth;
540 if (align == Alignment.ALIGN_NORMAL) {
541 if (dir == DIR_LEFT_TO_RIGHT) {
542 indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT);
543 x = left + indentWidth;
545 indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT);
546 x = right - indentWidth;
549 int max = (int)getLineExtent(lineNum, tabStops, false);
550 if (align == Alignment.ALIGN_OPPOSITE) {
551 if (dir == DIR_LEFT_TO_RIGHT) {
552 indentWidth = -getIndentAdjust(lineNum, Alignment.ALIGN_RIGHT);
553 x = right - max - indentWidth;
555 indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_LEFT);
556 x = left - max + indentWidth;
558 } else { // Alignment.ALIGN_CENTER
559 indentWidth = getIndentAdjust(lineNum, Alignment.ALIGN_CENTER);
561 x = ((right + left - max) >> 1) + indentWidth;
565 Directions directions = getLineDirections(lineNum);
566 if (directions == DIRS_ALL_LEFT_TO_RIGHT && !mSpannedText && !hasTab && !justify) {
567 // XXX: assumes there's nothing additional to be done
568 canvas.drawText(buf, start, end, x, lbaseline, paint);
570 tl.set(paint, buf, start, end, dir, directions, hasTab, tabStops,
571 getEllipsisStart(lineNum),
572 getEllipsisStart(lineNum) + getEllipsisCount(lineNum));
574 tl.justify(right - left - indentWidth);
576 tl.draw(canvas, x, ltop, lbaseline, lbottom);
580 TextLine.recycle(tl);
587 public void drawBackground(Canvas canvas, Path highlight, Paint highlightPaint,
588 int cursorOffsetVertical, int firstLine, int lastLine) {
589 // First, draw LineBackgroundSpans.
590 // LineBackgroundSpans know nothing about the alignment, margins, or
591 // direction of the layout or line. XXX: Should they?
592 // They are evaluated at each line.
594 if (mLineBackgroundSpans == null) {
595 mLineBackgroundSpans = new SpanSet<LineBackgroundSpan>(LineBackgroundSpan.class);
598 Spanned buffer = (Spanned) mText;
599 int textLength = buffer.length();
600 mLineBackgroundSpans.init(buffer, 0, textLength);
602 if (mLineBackgroundSpans.numberOfSpans > 0) {
603 int previousLineBottom = getLineTop(firstLine);
604 int previousLineEnd = getLineStart(firstLine);
605 ParagraphStyle[] spans = NO_PARA_SPANS;
607 TextPaint paint = mPaint;
609 final int width = mWidth;
610 for (int i = firstLine; i <= lastLine; i++) {
611 int start = previousLineEnd;
612 int end = getLineStart(i + 1);
613 previousLineEnd = end;
615 int ltop = previousLineBottom;
616 int lbottom = getLineTop(i + 1);
617 previousLineBottom = lbottom;
618 int lbaseline = lbottom - getLineDescent(i);
620 if (end >= spanEnd) {
621 // These should be infrequent, so we'll use this so that
622 // we don't have to check as often.
623 spanEnd = mLineBackgroundSpans.getNextTransition(start, textLength);
624 // All LineBackgroundSpans on a line contribute to its background.
626 // Duplication of the logic of getParagraphSpans
627 if (start != end || start == 0) {
628 // Equivalent to a getSpans(start, end), but filling the 'spans' local
629 // array instead to reduce memory allocation
630 for (int j = 0; j < mLineBackgroundSpans.numberOfSpans; j++) {
631 // equal test is valid since both intervals are not empty by
633 if (mLineBackgroundSpans.spanStarts[j] >= end ||
634 mLineBackgroundSpans.spanEnds[j] <= start) continue;
635 spans = GrowingArrayUtils.append(
636 spans, spansLength, mLineBackgroundSpans.spans[j]);
642 for (int n = 0; n < spansLength; n++) {
643 LineBackgroundSpan lineBackgroundSpan = (LineBackgroundSpan) spans[n];
644 lineBackgroundSpan.drawBackground(canvas, paint, 0, width,
645 ltop, lbaseline, lbottom,
646 buffer, start, end, i);
650 mLineBackgroundSpans.recycle();
653 // There can be a highlight even without spans if we are drawing
654 // a non-spanned transformation of a spanned editing buffer.
655 if (highlight != null) {
656 if (cursorOffsetVertical != 0) canvas.translate(0, cursorOffsetVertical);
657 canvas.drawPath(highlight, highlightPaint);
658 if (cursorOffsetVertical != 0) canvas.translate(0, -cursorOffsetVertical);
664 * @return The range of lines that need to be drawn, possibly empty.
668 public long getLineRangeForDraw(Canvas canvas) {
671 synchronized (sTempRect) {
672 if (!canvas.getClipBounds(sTempRect)) {
673 // Negative range end used as a special flag
674 return TextUtils.packRangeInLong(0, -1);
677 dtop = sTempRect.top;
678 dbottom = sTempRect.bottom;
681 final int top = Math.max(dtop, 0);
682 final int bottom = Math.min(getLineTop(getLineCount()), dbottom);
684 if (top >= bottom) return TextUtils.packRangeInLong(0, -1);
685 return TextUtils.packRangeInLong(getLineForVertical(top), getLineForVertical(bottom));
689 * Return the start position of the line, given the left and right bounds
692 * @param line the line index
693 * @param left the left bounds (0, or leading margin if ltr para)
694 * @param right the right bounds (width, minus leading margin if rtl para)
695 * @return the start position of the line (to right of line if rtl para)
697 private int getLineStartPos(int line, int left, int right) {
698 // Adjust the point at which to start rendering depending on the
699 // alignment of the paragraph.
700 Alignment align = getParagraphAlignment(line);
701 int dir = getParagraphDirection(line);
703 if (align == Alignment.ALIGN_LEFT) {
704 align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_NORMAL : Alignment.ALIGN_OPPOSITE;
705 } else if (align == Alignment.ALIGN_RIGHT) {
706 align = (dir == DIR_LEFT_TO_RIGHT) ? Alignment.ALIGN_OPPOSITE : Alignment.ALIGN_NORMAL;
710 if (align == Alignment.ALIGN_NORMAL) {
711 if (dir == DIR_LEFT_TO_RIGHT) {
712 x = left + getIndentAdjust(line, Alignment.ALIGN_LEFT);
714 x = right + getIndentAdjust(line, Alignment.ALIGN_RIGHT);
717 TabStops tabStops = null;
718 if (mSpannedText && getLineContainsTab(line)) {
719 Spanned spanned = (Spanned) mText;
720 int start = getLineStart(line);
721 int spanEnd = spanned.nextSpanTransition(start, spanned.length(),
723 TabStopSpan[] tabSpans = getParagraphSpans(spanned, start, spanEnd,
725 if (tabSpans.length > 0) {
726 tabStops = new TabStops(TAB_INCREMENT, tabSpans);
729 int max = (int)getLineExtent(line, tabStops, false);
730 if (align == Alignment.ALIGN_OPPOSITE) {
731 if (dir == DIR_LEFT_TO_RIGHT) {
732 x = right - max + getIndentAdjust(line, Alignment.ALIGN_RIGHT);
734 // max is negative here
735 x = left - max + getIndentAdjust(line, Alignment.ALIGN_LEFT);
737 } else { // Alignment.ALIGN_CENTER
739 x = (left + right - max) >> 1 + getIndentAdjust(line, Alignment.ALIGN_CENTER);
746 * Return the text that is displayed by this Layout.
748 public final CharSequence getText() {
753 * Return the base Paint properties for this layout.
754 * Do NOT change the paint, which may result in funny
755 * drawing for this layout.
757 public final TextPaint getPaint() {
762 * Return the width of this layout.
764 public final int getWidth() {
769 * Return the width to which this Layout is ellipsizing, or
770 * {@link #getWidth} if it is not doing anything special.
772 public int getEllipsizedWidth() {
777 * Increase the width of this layout to the specified width.
778 * Be careful to use this only when you know it is appropriate—
779 * it does not cause the text to reflow to use the full new width.
781 public final void increaseWidthTo(int wid) {
783 throw new RuntimeException("attempted to reduce Layout width");
790 * Return the total height of this layout.
792 public int getHeight() {
793 return getLineTop(getLineCount());
797 * Return the total height of this layout.
799 * @param cap if true and max lines is set, returns the height of the layout at the max lines.
803 public int getHeight(boolean cap) {
808 * Return the base alignment of this layout.
810 public final Alignment getAlignment() {
815 * Return what the text height is multiplied by to get the line height.
817 public final float getSpacingMultiplier() {
822 * Return the number of units of leading that are added to each line.
824 public final float getSpacingAdd() {
829 * Return the heuristic used to determine paragraph text direction.
832 public final TextDirectionHeuristic getTextDirectionHeuristic() {
837 * Return the number of lines of text in this layout.
839 public abstract int getLineCount();
842 * Return the baseline for the specified line (0…getLineCount() - 1)
843 * If bounds is not null, return the top, left, right, bottom extents
844 * of the specified line in it.
845 * @param line which line to examine (0..getLineCount() - 1)
846 * @param bounds Optional. If not null, it returns the extent of the line
847 * @return the Y-coordinate of the baseline
849 public int getLineBounds(int line, Rect bounds) {
850 if (bounds != null) {
851 bounds.left = 0; // ???
852 bounds.top = getLineTop(line);
853 bounds.right = mWidth; // ???
854 bounds.bottom = getLineTop(line + 1);
856 return getLineBaseline(line);
860 * Return the vertical position of the top of the specified line
861 * (0…getLineCount()).
862 * If the specified line is equal to the line count, returns the
863 * bottom of the last line.
865 public abstract int getLineTop(int line);
868 * Return the descent of the specified line(0…getLineCount() - 1).
870 public abstract int getLineDescent(int line);
873 * Return the text offset of the beginning of the specified line (
874 * 0…getLineCount()). If the specified line is equal to the line
875 * count, returns the length of the text.
877 public abstract int getLineStart(int line);
880 * Returns the primary directionality of the paragraph containing the
881 * specified line, either 1 for left-to-right lines, or -1 for right-to-left
882 * lines (see {@link #DIR_LEFT_TO_RIGHT}, {@link #DIR_RIGHT_TO_LEFT}).
884 public abstract int getParagraphDirection(int line);
887 * Returns whether the specified line contains one or more
888 * characters that need to be handled specially, like tabs.
890 public abstract boolean getLineContainsTab(int line);
893 * Returns the directional run information for the specified line.
894 * The array alternates counts of characters in left-to-right
895 * and right-to-left segments of the line.
897 * <p>NOTE: this is inadequate to support bidirectional text, and will change.
899 public abstract Directions getLineDirections(int line);
902 * Returns the (negative) number of extra pixels of ascent padding in the
903 * top line of the Layout.
905 public abstract int getTopPadding();
908 * Returns the number of extra pixels of descent padding in the
909 * bottom line of the Layout.
911 public abstract int getBottomPadding();
914 * Returns the start hyphen edit for a line.
918 public @Paint.StartHyphenEdit int getStartHyphenEdit(int line) {
919 return Paint.START_HYPHEN_EDIT_NO_EDIT;
923 * Returns the end hyphen edit for a line.
927 public @Paint.EndHyphenEdit int getEndHyphenEdit(int line) {
928 return Paint.END_HYPHEN_EDIT_NO_EDIT;
932 * Returns the left indent for a line.
936 public int getIndentAdjust(int line, Alignment alignment) {
941 * Returns true if the character at offset and the preceding character
942 * are at different run levels (and thus there's a split caret).
943 * @param offset the offset
944 * @return true if at a level boundary
948 public boolean isLevelBoundary(int offset) {
949 int line = getLineForOffset(offset);
950 Directions dirs = getLineDirections(line);
951 if (dirs == DIRS_ALL_LEFT_TO_RIGHT || dirs == DIRS_ALL_RIGHT_TO_LEFT) {
955 int[] runs = dirs.mDirections;
956 int lineStart = getLineStart(line);
957 int lineEnd = getLineEnd(line);
958 if (offset == lineStart || offset == lineEnd) {
959 int paraLevel = getParagraphDirection(line) == 1 ? 0 : 1;
960 int runIndex = offset == lineStart ? 0 : runs.length - 2;
961 return ((runs[runIndex + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK) != paraLevel;
965 for (int i = 0; i < runs.length; i += 2) {
966 if (offset == runs[i]) {
974 * Returns true if the character at offset is right to left (RTL).
975 * @param offset the offset
976 * @return true if the character is RTL, false if it is LTR
978 public boolean isRtlCharAt(int offset) {
979 int line = getLineForOffset(offset);
980 Directions dirs = getLineDirections(line);
981 if (dirs == DIRS_ALL_LEFT_TO_RIGHT) {
984 if (dirs == DIRS_ALL_RIGHT_TO_LEFT) {
987 int[] runs = dirs.mDirections;
988 int lineStart = getLineStart(line);
989 for (int i = 0; i < runs.length; i += 2) {
990 int start = lineStart + runs[i];
991 int limit = start + (runs[i+1] & RUN_LENGTH_MASK);
992 if (offset >= start && offset < limit) {
993 int level = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK;
994 return ((level & 1) != 0);
997 // Should happen only if the offset is "out of bounds"
1002 * Returns the range of the run that the character at offset belongs to.
1003 * @param offset the offset
1004 * @return The range of the run
1007 public long getRunRange(int offset) {
1008 int line = getLineForOffset(offset);
1009 Directions dirs = getLineDirections(line);
1010 if (dirs == DIRS_ALL_LEFT_TO_RIGHT || dirs == DIRS_ALL_RIGHT_TO_LEFT) {
1011 return TextUtils.packRangeInLong(0, getLineEnd(line));
1013 int[] runs = dirs.mDirections;
1014 int lineStart = getLineStart(line);
1015 for (int i = 0; i < runs.length; i += 2) {
1016 int start = lineStart + runs[i];
1017 int limit = start + (runs[i+1] & RUN_LENGTH_MASK);
1018 if (offset >= start && offset < limit) {
1019 return TextUtils.packRangeInLong(start, limit);
1022 // Should happen only if the offset is "out of bounds"
1023 return TextUtils.packRangeInLong(0, getLineEnd(line));
1027 * Checks if the trailing BiDi level should be used for an offset
1029 * This method is useful when the offset is at the BiDi level transition point and determine
1030 * which run need to be used. For example, let's think about following input: (L* denotes
1031 * Left-to-Right characters, R* denotes Right-to-Left characters.)
1032 * Input (Logical Order): L1 L2 L3 R1 R2 R3 L4 L5 L6
1033 * Input (Display Order): L1 L2 L3 R3 R2 R1 L4 L5 L6
1035 * Then, think about selecting the range (3, 6). The offset=3 and offset=6 are ambiguous here
1036 * since they are at the BiDi transition point. In Android, the offset is considered to be
1037 * associated with the trailing run if the BiDi level of the trailing run is higher than of the
1038 * previous run. In this case, the BiDi level of the input text is as follows:
1040 * Input (Logical Order): L1 L2 L3 R1 R2 R3 L4 L5 L6
1041 * BiDi Run: [ Run 0 ][ Run 1 ][ Run 2 ]
1042 * BiDi Level: 0 0 0 1 1 1 0 0 0
1044 * Thus, offset = 3 is part of Run 1 and this method returns true for offset = 3, since the BiDi
1045 * level of Run 1 is higher than the level of Run 0. Similarly, the offset = 6 is a part of Run
1046 * 1 and this method returns false for the offset = 6 since the BiDi level of Run 1 is higher
1047 * than the level of Run 2.
1049 * @returns true if offset is at the BiDi level transition point and trailing BiDi level is
1050 * higher than previous BiDi level. See above for the detail.
1054 public boolean primaryIsTrailingPrevious(int offset) {
1055 int line = getLineForOffset(offset);
1056 int lineStart = getLineStart(line);
1057 int lineEnd = getLineEnd(line);
1058 int[] runs = getLineDirections(line).mDirections;
1061 for (int i = 0; i < runs.length; i += 2) {
1062 int start = lineStart + runs[i];
1063 int limit = start + (runs[i+1] & RUN_LENGTH_MASK);
1064 if (limit > lineEnd) {
1067 if (offset >= start && offset < limit) {
1068 if (offset > start) {
1069 // Previous character is at same level, so don't use trailing.
1072 levelAt = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK;
1076 if (levelAt == -1) {
1077 // Offset was limit of line.
1078 levelAt = getParagraphDirection(line) == 1 ? 0 : 1;
1081 // At level boundary, check previous level.
1082 int levelBefore = -1;
1083 if (offset == lineStart) {
1084 levelBefore = getParagraphDirection(line) == 1 ? 0 : 1;
1087 for (int i = 0; i < runs.length; i += 2) {
1088 int start = lineStart + runs[i];
1089 int limit = start + (runs[i+1] & RUN_LENGTH_MASK);
1090 if (limit > lineEnd) {
1093 if (offset >= start && offset < limit) {
1094 levelBefore = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK;
1100 return levelBefore < levelAt;
1104 * Computes in linear time the results of calling
1105 * #primaryIsTrailingPrevious for all offsets on a line.
1106 * @param line The line giving the offsets we compute the information for
1107 * @return The array of results, indexed from 0, where 0 corresponds to the line start offset
1111 public boolean[] primaryIsTrailingPreviousAllLineOffsets(int line) {
1112 int lineStart = getLineStart(line);
1113 int lineEnd = getLineEnd(line);
1114 int[] runs = getLineDirections(line).mDirections;
1116 boolean[] trailing = new boolean[lineEnd - lineStart + 1];
1118 byte[] level = new byte[lineEnd - lineStart + 1];
1119 for (int i = 0; i < runs.length; i += 2) {
1120 int start = lineStart + runs[i];
1121 int limit = start + (runs[i + 1] & RUN_LENGTH_MASK);
1122 if (limit > lineEnd) {
1125 if (limit == start) {
1128 level[limit - lineStart - 1] =
1129 (byte) ((runs[i + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK);
1132 for (int i = 0; i < runs.length; i += 2) {
1133 int start = lineStart + runs[i];
1134 byte currentLevel = (byte) ((runs[i + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK);
1135 trailing[start - lineStart] = currentLevel > (start == lineStart
1136 ? (getParagraphDirection(line) == 1 ? 0 : 1)
1137 : level[start - lineStart - 1]);
1144 * Get the primary horizontal position for the specified text offset.
1145 * This is the location where a new character would be inserted in
1146 * the paragraph's primary direction.
1148 public float getPrimaryHorizontal(int offset) {
1149 return getPrimaryHorizontal(offset, false /* not clamped */);
1153 * Get the primary horizontal position for the specified text offset, but
1154 * optionally clamp it so that it doesn't exceed the width of the layout.
1157 @UnsupportedAppUsage
1158 public float getPrimaryHorizontal(int offset, boolean clamped) {
1159 boolean trailing = primaryIsTrailingPrevious(offset);
1160 return getHorizontal(offset, trailing, clamped);
1164 * Get the secondary horizontal position for the specified text offset.
1165 * This is the location where a new character would be inserted in
1166 * the direction other than the paragraph's primary direction.
1168 public float getSecondaryHorizontal(int offset) {
1169 return getSecondaryHorizontal(offset, false /* not clamped */);
1173 * Get the secondary horizontal position for the specified text offset, but
1174 * optionally clamp it so that it doesn't exceed the width of the layout.
1177 @UnsupportedAppUsage
1178 public float getSecondaryHorizontal(int offset, boolean clamped) {
1179 boolean trailing = primaryIsTrailingPrevious(offset);
1180 return getHorizontal(offset, !trailing, clamped);
1183 private float getHorizontal(int offset, boolean primary) {
1184 return primary ? getPrimaryHorizontal(offset) : getSecondaryHorizontal(offset);
1187 private float getHorizontal(int offset, boolean trailing, boolean clamped) {
1188 int line = getLineForOffset(offset);
1190 return getHorizontal(offset, trailing, line, clamped);
1193 private float getHorizontal(int offset, boolean trailing, int line, boolean clamped) {
1194 int start = getLineStart(line);
1195 int end = getLineEnd(line);
1196 int dir = getParagraphDirection(line);
1197 boolean hasTab = getLineContainsTab(line);
1198 Directions directions = getLineDirections(line);
1200 TabStops tabStops = null;
1201 if (hasTab && mText instanceof Spanned) {
1202 // Just checking this line should be good enough, tabs should be
1203 // consistent across all lines in a paragraph.
1204 TabStopSpan[] tabs = getParagraphSpans((Spanned) mText, start, end, TabStopSpan.class);
1205 if (tabs.length > 0) {
1206 tabStops = new TabStops(TAB_INCREMENT, tabs); // XXX should reuse
1210 TextLine tl = TextLine.obtain();
1211 tl.set(mPaint, mText, start, end, dir, directions, hasTab, tabStops,
1212 getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line));
1213 float wid = tl.measure(offset - start, trailing, null);
1214 TextLine.recycle(tl);
1216 if (clamped && wid > mWidth) {
1219 int left = getParagraphLeft(line);
1220 int right = getParagraphRight(line);
1222 return getLineStartPos(line, left, right) + wid;
1226 * Computes in linear time the results of calling #getHorizontal for all offsets on a line.
1228 * @param line The line giving the offsets we compute information for
1229 * @param clamped Whether to clamp the results to the width of the layout
1230 * @param primary Whether the results should be the primary or the secondary horizontal
1231 * @return The array of results, indexed from 0, where 0 corresponds to the line start offset
1233 private float[] getLineHorizontals(int line, boolean clamped, boolean primary) {
1234 int start = getLineStart(line);
1235 int end = getLineEnd(line);
1236 int dir = getParagraphDirection(line);
1237 boolean hasTab = getLineContainsTab(line);
1238 Directions directions = getLineDirections(line);
1240 TabStops tabStops = null;
1241 if (hasTab && mText instanceof Spanned) {
1242 // Just checking this line should be good enough, tabs should be
1243 // consistent across all lines in a paragraph.
1244 TabStopSpan[] tabs = getParagraphSpans((Spanned) mText, start, end, TabStopSpan.class);
1245 if (tabs.length > 0) {
1246 tabStops = new TabStops(TAB_INCREMENT, tabs); // XXX should reuse
1250 TextLine tl = TextLine.obtain();
1251 tl.set(mPaint, mText, start, end, dir, directions, hasTab, tabStops,
1252 getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line));
1253 boolean[] trailings = primaryIsTrailingPreviousAllLineOffsets(line);
1255 for (int offset = 0; offset < trailings.length; ++offset) {
1256 trailings[offset] = !trailings[offset];
1259 float[] wid = tl.measureAllOffsets(trailings, null);
1260 TextLine.recycle(tl);
1263 for (int offset = 0; offset < wid.length; ++offset) {
1264 if (wid[offset] > mWidth) {
1265 wid[offset] = mWidth;
1269 int left = getParagraphLeft(line);
1270 int right = getParagraphRight(line);
1272 int lineStartPos = getLineStartPos(line, left, right);
1273 float[] horizontal = new float[end - start + 1];
1274 for (int offset = 0; offset < horizontal.length; ++offset) {
1275 horizontal[offset] = lineStartPos + wid[offset];
1281 * Get the leftmost position that should be exposed for horizontal
1282 * scrolling on the specified line.
1284 public float getLineLeft(int line) {
1285 final int dir = getParagraphDirection(line);
1286 Alignment align = getParagraphAlignment(line);
1287 // Before Q, StaticLayout.Builder.setAlignment didn't check whether the input alignment
1288 // is null. And when it is null, the old behavior is the same as ALIGN_CENTER.
1289 // To keep consistency, we convert a null alignment to ALIGN_CENTER.
1290 if (align == null) {
1291 align = Alignment.ALIGN_CENTER;
1294 // First convert combinations of alignment and direction settings to
1295 // three basic cases: ALIGN_LEFT, ALIGN_RIGHT and ALIGN_CENTER.
1296 // For unexpected cases, it will fallback to ALIGN_LEFT.
1297 final Alignment resultAlign;
1301 dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_RIGHT : Alignment.ALIGN_LEFT;
1303 case ALIGN_OPPOSITE:
1305 dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_LEFT : Alignment.ALIGN_RIGHT;
1308 resultAlign = Alignment.ALIGN_CENTER;
1311 resultAlign = Alignment.ALIGN_RIGHT;
1313 default: /* align == Alignment.ALIGN_LEFT */
1314 resultAlign = Alignment.ALIGN_LEFT;
1317 // Here we must use getLineMax() to do the computation, because it maybe overridden by
1318 // derived class. And also note that line max equals the width of the text in that line
1319 // plus the leading margin.
1320 switch (resultAlign) {
1322 final int left = getParagraphLeft(line);
1323 final float max = getLineMax(line);
1324 // This computation only works when mWidth equals leadingMargin plus
1325 // the width of text in this line. If this condition doesn't meet anymore,
1326 // please change here too.
1327 return (float) Math.floor(left + (mWidth - max) / 2);
1329 return mWidth - getLineMax(line);
1330 default: /* resultAlign == Alignment.ALIGN_LEFT */
1336 * Get the rightmost position that should be exposed for horizontal
1337 * scrolling on the specified line.
1339 public float getLineRight(int line) {
1340 final int dir = getParagraphDirection(line);
1341 Alignment align = getParagraphAlignment(line);
1342 // Before Q, StaticLayout.Builder.setAlignment didn't check whether the input alignment
1343 // is null. And when it is null, the old behavior is the same as ALIGN_CENTER.
1344 // To keep consistency, we convert a null alignment to ALIGN_CENTER.
1345 if (align == null) {
1346 align = Alignment.ALIGN_CENTER;
1349 final Alignment resultAlign;
1353 dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_RIGHT : Alignment.ALIGN_LEFT;
1355 case ALIGN_OPPOSITE:
1357 dir == DIR_RIGHT_TO_LEFT ? Alignment.ALIGN_LEFT : Alignment.ALIGN_RIGHT;
1360 resultAlign = Alignment.ALIGN_CENTER;
1363 resultAlign = Alignment.ALIGN_RIGHT;
1365 default: /* align == Alignment.ALIGN_LEFT */
1366 resultAlign = Alignment.ALIGN_LEFT;
1369 switch (resultAlign) {
1371 final int right = getParagraphRight(line);
1372 final float max = getLineMax(line);
1373 // This computation only works when mWidth equals leadingMargin plus width of the
1374 // text in this line. If this condition doesn't meet anymore, please change here.
1375 return (float) Math.ceil(right - (mWidth - max) / 2);
1378 default: /* resultAlign == Alignment.ALIGN_LEFT */
1379 return getLineMax(line);
1384 * Gets the unsigned horizontal extent of the specified line, including
1385 * leading margin indent, but excluding trailing whitespace.
1387 public float getLineMax(int line) {
1388 float margin = getParagraphLeadingMargin(line);
1389 float signedExtent = getLineExtent(line, false);
1390 return margin + (signedExtent >= 0 ? signedExtent : -signedExtent);
1394 * Gets the unsigned horizontal extent of the specified line, including
1395 * leading margin indent and trailing whitespace.
1397 public float getLineWidth(int line) {
1398 float margin = getParagraphLeadingMargin(line);
1399 float signedExtent = getLineExtent(line, true);
1400 return margin + (signedExtent >= 0 ? signedExtent : -signedExtent);
1404 * Like {@link #getLineExtent(int,TabStops,boolean)} but determines the
1405 * tab stops instead of using the ones passed in.
1406 * @param line the index of the line
1407 * @param full whether to include trailing whitespace
1408 * @return the extent of the line
1410 private float getLineExtent(int line, boolean full) {
1411 final int start = getLineStart(line);
1412 final int end = full ? getLineEnd(line) : getLineVisibleEnd(line);
1414 final boolean hasTabs = getLineContainsTab(line);
1415 TabStops tabStops = null;
1416 if (hasTabs && mText instanceof Spanned) {
1417 // Just checking this line should be good enough, tabs should be
1418 // consistent across all lines in a paragraph.
1419 TabStopSpan[] tabs = getParagraphSpans((Spanned) mText, start, end, TabStopSpan.class);
1420 if (tabs.length > 0) {
1421 tabStops = new TabStops(TAB_INCREMENT, tabs); // XXX should reuse
1424 final Directions directions = getLineDirections(line);
1425 // Returned directions can actually be null
1426 if (directions == null) {
1429 final int dir = getParagraphDirection(line);
1431 final TextLine tl = TextLine.obtain();
1432 final TextPaint paint = mWorkPaint;
1434 paint.setStartHyphenEdit(getStartHyphenEdit(line));
1435 paint.setEndHyphenEdit(getEndHyphenEdit(line));
1436 tl.set(paint, mText, start, end, dir, directions, hasTabs, tabStops,
1437 getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line));
1438 if (isJustificationRequired(line)) {
1439 tl.justify(getJustifyWidth(line));
1441 final float width = tl.metrics(null);
1442 TextLine.recycle(tl);
1447 * Returns the signed horizontal extent of the specified line, excluding
1448 * leading margin. If full is false, excludes trailing whitespace.
1449 * @param line the index of the line
1450 * @param tabStops the tab stops, can be null if we know they're not used.
1451 * @param full whether to include trailing whitespace
1452 * @return the extent of the text on this line
1454 private float getLineExtent(int line, TabStops tabStops, boolean full) {
1455 final int start = getLineStart(line);
1456 final int end = full ? getLineEnd(line) : getLineVisibleEnd(line);
1457 final boolean hasTabs = getLineContainsTab(line);
1458 final Directions directions = getLineDirections(line);
1459 final int dir = getParagraphDirection(line);
1461 final TextLine tl = TextLine.obtain();
1462 final TextPaint paint = mWorkPaint;
1464 paint.setStartHyphenEdit(getStartHyphenEdit(line));
1465 paint.setEndHyphenEdit(getEndHyphenEdit(line));
1466 tl.set(paint, mText, start, end, dir, directions, hasTabs, tabStops,
1467 getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line));
1468 if (isJustificationRequired(line)) {
1469 tl.justify(getJustifyWidth(line));
1471 final float width = tl.metrics(null);
1472 TextLine.recycle(tl);
1477 * Get the line number corresponding to the specified vertical position.
1478 * If you ask for a position above 0, you get 0; if you ask for a position
1479 * below the bottom of the text, you get the last line.
1481 // FIXME: It may be faster to do a linear search for layouts without many lines.
1482 public int getLineForVertical(int vertical) {
1483 int high = getLineCount(), low = -1, guess;
1485 while (high - low > 1) {
1486 guess = (high + low) / 2;
1488 if (getLineTop(guess) > vertical)
1501 * Get the line number on which the specified text offset appears.
1502 * If you ask for a position before 0, you get 0; if you ask for a position
1503 * beyond the end of the text, you get the last line.
1505 public int getLineForOffset(int offset) {
1506 int high = getLineCount(), low = -1, guess;
1508 while (high - low > 1) {
1509 guess = (high + low) / 2;
1511 if (getLineStart(guess) > offset)
1525 * Get the character offset on the specified line whose position is
1526 * closest to the specified horizontal position.
1528 public int getOffsetForHorizontal(int line, float horiz) {
1529 return getOffsetForHorizontal(line, horiz, true);
1533 * Get the character offset on the specified line whose position is
1534 * closest to the specified horizontal position.
1536 * @param line the line used to find the closest offset
1537 * @param horiz the horizontal position used to find the closest offset
1538 * @param primary whether to use the primary position or secondary position to find the offset
1542 public int getOffsetForHorizontal(int line, float horiz, boolean primary) {
1543 // TODO: use Paint.getOffsetForAdvance to avoid binary search
1544 final int lineEndOffset = getLineEnd(line);
1545 final int lineStartOffset = getLineStart(line);
1547 Directions dirs = getLineDirections(line);
1549 TextLine tl = TextLine.obtain();
1550 // XXX: we don't care about tabs as we just use TextLine#getOffsetToLeftRightOf here.
1551 tl.set(mPaint, mText, lineStartOffset, lineEndOffset, getParagraphDirection(line), dirs,
1553 getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line));
1554 final HorizontalMeasurementProvider horizontal =
1555 new HorizontalMeasurementProvider(line, primary);
1558 if (line == getLineCount() - 1) {
1559 max = lineEndOffset;
1561 max = tl.getOffsetToLeftRightOf(lineEndOffset - lineStartOffset,
1562 !isRtlCharAt(lineEndOffset - 1)) + lineStartOffset;
1564 int best = lineStartOffset;
1565 float bestdist = Math.abs(horizontal.get(lineStartOffset) - horiz);
1567 for (int i = 0; i < dirs.mDirections.length; i += 2) {
1568 int here = lineStartOffset + dirs.mDirections[i];
1569 int there = here + (dirs.mDirections[i+1] & RUN_LENGTH_MASK);
1570 boolean isRtl = (dirs.mDirections[i+1] & RUN_RTL_FLAG) != 0;
1571 int swap = isRtl ? -1 : 1;
1575 int high = there - 1 + 1, low = here + 1 - 1, guess;
1577 while (high - low > 1) {
1578 guess = (high + low) / 2;
1579 int adguess = getOffsetAtStartOf(guess);
1581 if (horizontal.get(adguess) * swap >= horiz * swap) {
1592 int aft = tl.getOffsetToLeftRightOf(low - lineStartOffset, isRtl) + lineStartOffset;
1593 low = tl.getOffsetToLeftRightOf(aft - lineStartOffset, !isRtl) + lineStartOffset;
1594 if (low >= here && low < there) {
1595 float dist = Math.abs(horizontal.get(low) - horiz);
1597 float other = Math.abs(horizontal.get(aft) - horiz);
1605 if (dist < bestdist) {
1612 float dist = Math.abs(horizontal.get(here) - horiz);
1614 if (dist < bestdist) {
1620 float dist = Math.abs(horizontal.get(max) - horiz);
1622 if (dist <= bestdist) {
1626 TextLine.recycle(tl);
1631 * Responds to #getHorizontal queries, by selecting the better strategy between:
1632 * - calling #getHorizontal explicitly for each query
1633 * - precomputing all #getHorizontal measurements, and responding to any query in constant time
1634 * The first strategy is used for LTR-only text, while the second is used for all other cases.
1635 * The class is currently only used in #getOffsetForHorizontal, so reuse with care in other
1638 private class HorizontalMeasurementProvider {
1639 private final int mLine;
1640 private final boolean mPrimary;
1642 private float[] mHorizontals;
1643 private int mLineStartOffset;
1645 HorizontalMeasurementProvider(final int line, final boolean primary) {
1651 private void init() {
1652 final Directions dirs = getLineDirections(mLine);
1653 if (dirs == DIRS_ALL_LEFT_TO_RIGHT) {
1657 mHorizontals = getLineHorizontals(mLine, false, mPrimary);
1658 mLineStartOffset = getLineStart(mLine);
1661 float get(final int offset) {
1662 final int index = offset - mLineStartOffset;
1663 if (mHorizontals == null || index < 0 || index >= mHorizontals.length) {
1664 return getHorizontal(offset, mPrimary);
1666 return mHorizontals[index];
1672 * Return the text offset after the last character on the specified line.
1674 public final int getLineEnd(int line) {
1675 return getLineStart(line + 1);
1679 * Return the text offset after the last visible character (so whitespace
1680 * is not counted) on the specified line.
1682 public int getLineVisibleEnd(int line) {
1683 return getLineVisibleEnd(line, getLineStart(line), getLineStart(line+1));
1686 private int getLineVisibleEnd(int line, int start, int end) {
1687 CharSequence text = mText;
1689 if (line == getLineCount() - 1) {
1693 for (; end > start; end--) {
1694 ch = text.charAt(end - 1);
1700 if (!TextLine.isLineEndSpace(ch)) {
1710 * Return the vertical position of the bottom of the specified line.
1712 public final int getLineBottom(int line) {
1713 return getLineTop(line + 1);
1717 * Return the vertical position of the bottom of the specified line without the line spacing
1722 public final int getLineBottomWithoutSpacing(int line) {
1723 return getLineTop(line + 1) - getLineExtra(line);
1727 * Return the vertical position of the baseline of the specified line.
1729 public final int getLineBaseline(int line) {
1730 // getLineTop(line+1) == getLineBottom(line)
1731 return getLineTop(line+1) - getLineDescent(line);
1735 * Get the ascent of the text on the specified line.
1736 * The return value is negative to match the Paint.ascent() convention.
1738 public final int getLineAscent(int line) {
1739 // getLineTop(line+1) - getLineDescent(line) == getLineBaseLine(line)
1740 return getLineTop(line) - (getLineTop(line+1) - getLineDescent(line));
1744 * Return the extra space added as a result of line spacing attributes
1745 * {@link #getSpacingAdd()} and {@link #getSpacingMultiplier()}. Default value is {@code zero}.
1747 * @param line the index of the line, the value should be equal or greater than {@code zero}
1750 public int getLineExtra(@IntRange(from = 0) int line) {
1754 public int getOffsetToLeftOf(int offset) {
1755 return getOffsetToLeftRightOf(offset, true);
1758 public int getOffsetToRightOf(int offset) {
1759 return getOffsetToLeftRightOf(offset, false);
1762 private int getOffsetToLeftRightOf(int caret, boolean toLeft) {
1763 int line = getLineForOffset(caret);
1764 int lineStart = getLineStart(line);
1765 int lineEnd = getLineEnd(line);
1766 int lineDir = getParagraphDirection(line);
1768 boolean lineChanged = false;
1769 boolean advance = toLeft == (lineDir == DIR_RIGHT_TO_LEFT);
1770 // if walking off line, look at the line we're headed to
1772 if (caret == lineEnd) {
1773 if (line < getLineCount() - 1) {
1777 return caret; // at very end, don't move
1781 if (caret == lineStart) {
1786 return caret; // at very start, don't move
1792 lineStart = getLineStart(line);
1793 lineEnd = getLineEnd(line);
1794 int newDir = getParagraphDirection(line);
1795 if (newDir != lineDir) {
1796 // unusual case. we want to walk onto the line, but it runs
1797 // in a different direction than this one, so we fake movement
1798 // in the opposite direction.
1804 Directions directions = getLineDirections(line);
1806 TextLine tl = TextLine.obtain();
1807 // XXX: we don't care about tabs
1808 tl.set(mPaint, mText, lineStart, lineEnd, lineDir, directions, false, null,
1809 getEllipsisStart(line), getEllipsisStart(line) + getEllipsisCount(line));
1810 caret = lineStart + tl.getOffsetToLeftRightOf(caret - lineStart, toLeft);
1811 TextLine.recycle(tl);
1815 private int getOffsetAtStartOf(int offset) {
1816 // XXX this probably should skip local reorderings and
1817 // zero-width characters, look at callers
1821 CharSequence text = mText;
1822 char c = text.charAt(offset);
1824 if (c >= '\uDC00' && c <= '\uDFFF') {
1825 char c1 = text.charAt(offset - 1);
1827 if (c1 >= '\uD800' && c1 <= '\uDBFF')
1832 ReplacementSpan[] spans = ((Spanned) text).getSpans(offset, offset,
1833 ReplacementSpan.class);
1835 for (int i = 0; i < spans.length; i++) {
1836 int start = ((Spanned) text).getSpanStart(spans[i]);
1837 int end = ((Spanned) text).getSpanEnd(spans[i]);
1839 if (start < offset && end > offset)
1848 * Determine whether we should clamp cursor position. Currently it's
1849 * only robust for left-aligned displays.
1852 @UnsupportedAppUsage
1853 public boolean shouldClampCursor(int line) {
1854 // Only clamp cursor position in left-aligned displays.
1855 switch (getParagraphAlignment(line)) {
1859 return getParagraphDirection(line) > 0;
1867 * Fills in the specified Path with a representation of a cursor
1868 * at the specified offset. This will often be a vertical line
1869 * but can be multiple discontinuous lines in text with multiple
1872 public void getCursorPath(final int point, final Path dest, final CharSequence editingBuffer) {
1875 int line = getLineForOffset(point);
1876 int top = getLineTop(line);
1877 int bottom = getLineBottomWithoutSpacing(line);
1879 boolean clamped = shouldClampCursor(line);
1880 float h1 = getPrimaryHorizontal(point, clamped) - 0.5f;
1882 int caps = TextKeyListener.getMetaState(editingBuffer, TextKeyListener.META_SHIFT_ON) |
1883 TextKeyListener.getMetaState(editingBuffer, TextKeyListener.META_SELECTING);
1884 int fn = TextKeyListener.getMetaState(editingBuffer, TextKeyListener.META_ALT_ON);
1887 if (caps != 0 || fn != 0) {
1888 dist = (bottom - top) >> 2;
1899 dest.moveTo(h1, top);
1900 dest.lineTo(h1, bottom);
1903 dest.moveTo(h1, bottom);
1904 dest.lineTo(h1 - dist, bottom + dist);
1905 dest.lineTo(h1, bottom);
1906 dest.lineTo(h1 + dist, bottom + dist);
1907 } else if (caps == 1) {
1908 dest.moveTo(h1, bottom);
1909 dest.lineTo(h1 - dist, bottom + dist);
1911 dest.moveTo(h1 - dist, bottom + dist - 0.5f);
1912 dest.lineTo(h1 + dist, bottom + dist - 0.5f);
1914 dest.moveTo(h1 + dist, bottom + dist);
1915 dest.lineTo(h1, bottom);
1919 dest.moveTo(h1, top);
1920 dest.lineTo(h1 - dist, top - dist);
1921 dest.lineTo(h1, top);
1922 dest.lineTo(h1 + dist, top - dist);
1923 } else if (fn == 1) {
1924 dest.moveTo(h1, top);
1925 dest.lineTo(h1 - dist, top - dist);
1927 dest.moveTo(h1 - dist, top - dist + 0.5f);
1928 dest.lineTo(h1 + dist, top - dist + 0.5f);
1930 dest.moveTo(h1 + dist, top - dist);
1931 dest.lineTo(h1, top);
1935 private void addSelection(int line, int start, int end,
1936 int top, int bottom, SelectionRectangleConsumer consumer) {
1937 int linestart = getLineStart(line);
1938 int lineend = getLineEnd(line);
1939 Directions dirs = getLineDirections(line);
1941 if (lineend > linestart && mText.charAt(lineend - 1) == '\n') {
1945 for (int i = 0; i < dirs.mDirections.length; i += 2) {
1946 int here = linestart + dirs.mDirections[i];
1947 int there = here + (dirs.mDirections[i + 1] & RUN_LENGTH_MASK);
1949 if (there > lineend) {
1953 if (start <= there && end >= here) {
1954 int st = Math.max(start, here);
1955 int en = Math.min(end, there);
1958 float h1 = getHorizontal(st, false, line, false /* not clamped */);
1959 float h2 = getHorizontal(en, true, line, false /* not clamped */);
1961 float left = Math.min(h1, h2);
1962 float right = Math.max(h1, h2);
1964 final @TextSelectionLayout int layout =
1965 ((dirs.mDirections[i + 1] & RUN_RTL_FLAG) != 0)
1966 ? TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT
1967 : TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT;
1969 consumer.accept(left, top, right, bottom, layout);
1976 * Fills in the specified Path with a representation of a highlight
1977 * between the specified offsets. This will often be a rectangle
1978 * or a potentially discontinuous set of rectangles. If the start
1979 * and end are the same, the returned path is empty.
1981 public void getSelectionPath(int start, int end, Path dest) {
1983 getSelection(start, end, (left, top, right, bottom, textSelectionLayout) ->
1984 dest.addRect(left, top, right, bottom, Path.Direction.CW));
1988 * Calculates the rectangles which should be highlighted to indicate a selection between start
1989 * and end and feeds them into the given {@link SelectionRectangleConsumer}.
1991 * @param start the starting index of the selection
1992 * @param end the ending index of the selection
1993 * @param consumer the {@link SelectionRectangleConsumer} which will receive the generated
1994 * rectangles. It will be called every time a rectangle is generated.
1996 * @see #getSelectionPath(int, int, Path)
1998 public final void getSelection(int start, int end, final SelectionRectangleConsumer consumer) {
2009 final int startline = getLineForOffset(start);
2010 final int endline = getLineForOffset(end);
2012 int top = getLineTop(startline);
2013 int bottom = getLineBottomWithoutSpacing(endline);
2015 if (startline == endline) {
2016 addSelection(startline, start, end, top, bottom, consumer);
2018 final float width = mWidth;
2020 addSelection(startline, start, getLineEnd(startline),
2021 top, getLineBottom(startline), consumer);
2023 if (getParagraphDirection(startline) == DIR_RIGHT_TO_LEFT) {
2024 consumer.accept(getLineLeft(startline), top, 0, getLineBottom(startline),
2025 TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT);
2027 consumer.accept(getLineRight(startline), top, width, getLineBottom(startline),
2028 TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT);
2031 for (int i = startline + 1; i < endline; i++) {
2032 top = getLineTop(i);
2033 bottom = getLineBottom(i);
2034 if (getParagraphDirection(i) == DIR_RIGHT_TO_LEFT) {
2035 consumer.accept(0, top, width, bottom, TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT);
2037 consumer.accept(0, top, width, bottom, TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT);
2041 top = getLineTop(endline);
2042 bottom = getLineBottomWithoutSpacing(endline);
2044 addSelection(endline, getLineStart(endline), end, top, bottom, consumer);
2046 if (getParagraphDirection(endline) == DIR_RIGHT_TO_LEFT) {
2047 consumer.accept(width, top, getLineRight(endline), bottom,
2048 TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT);
2050 consumer.accept(0, top, getLineLeft(endline), bottom,
2051 TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT);
2057 * Get the alignment of the specified paragraph, taking into account
2058 * markup attached to it.
2060 public final Alignment getParagraphAlignment(int line) {
2061 Alignment align = mAlignment;
2064 Spanned sp = (Spanned) mText;
2065 AlignmentSpan[] spans = getParagraphSpans(sp, getLineStart(line),
2067 AlignmentSpan.class);
2069 int spanLength = spans.length;
2070 if (spanLength > 0) {
2071 align = spans[spanLength-1].getAlignment();
2079 * Get the left edge of the specified paragraph, inset by left margins.
2081 public final int getParagraphLeft(int line) {
2083 int dir = getParagraphDirection(line);
2084 if (dir == DIR_RIGHT_TO_LEFT || !mSpannedText) {
2085 return left; // leading margin has no impact, or no styles
2087 return getParagraphLeadingMargin(line);
2091 * Get the right edge of the specified paragraph, inset by right margins.
2093 public final int getParagraphRight(int line) {
2095 int dir = getParagraphDirection(line);
2096 if (dir == DIR_LEFT_TO_RIGHT || !mSpannedText) {
2097 return right; // leading margin has no impact, or no styles
2099 return right - getParagraphLeadingMargin(line);
2103 * Returns the effective leading margin (unsigned) for this line,
2104 * taking into account LeadingMarginSpan and LeadingMarginSpan2.
2105 * @param line the line index
2106 * @return the leading margin of this line
2108 private int getParagraphLeadingMargin(int line) {
2109 if (!mSpannedText) {
2112 Spanned spanned = (Spanned) mText;
2114 int lineStart = getLineStart(line);
2115 int lineEnd = getLineEnd(line);
2116 int spanEnd = spanned.nextSpanTransition(lineStart, lineEnd,
2117 LeadingMarginSpan.class);
2118 LeadingMarginSpan[] spans = getParagraphSpans(spanned, lineStart, spanEnd,
2119 LeadingMarginSpan.class);
2120 if (spans.length == 0) {
2121 return 0; // no leading margin span;
2126 boolean useFirstLineMargin = lineStart == 0 || spanned.charAt(lineStart - 1) == '\n';
2127 for (int i = 0; i < spans.length; i++) {
2128 if (spans[i] instanceof LeadingMarginSpan2) {
2129 int spStart = spanned.getSpanStart(spans[i]);
2130 int spanLine = getLineForOffset(spStart);
2131 int count = ((LeadingMarginSpan2) spans[i]).getLeadingMarginLineCount();
2132 // if there is more than one LeadingMarginSpan2, use the count that is greatest
2133 useFirstLineMargin |= line < spanLine + count;
2136 for (int i = 0; i < spans.length; i++) {
2137 LeadingMarginSpan span = spans[i];
2138 margin += span.getLeadingMargin(useFirstLineMargin);
2144 private static float measurePara(TextPaint paint, CharSequence text, int start, int end,
2145 TextDirectionHeuristic textDir) {
2146 MeasuredParagraph mt = null;
2147 TextLine tl = TextLine.obtain();
2149 mt = MeasuredParagraph.buildForBidi(text, start, end, textDir, mt);
2150 final char[] chars = mt.getChars();
2151 final int len = chars.length;
2152 final Directions directions = mt.getDirections(0, len);
2153 final int dir = mt.getParagraphDir();
2154 boolean hasTabs = false;
2155 TabStops tabStops = null;
2156 // leading margins should be taken into account when measuring a paragraph
2158 if (text instanceof Spanned) {
2159 Spanned spanned = (Spanned) text;
2160 LeadingMarginSpan[] spans = getParagraphSpans(spanned, start, end,
2161 LeadingMarginSpan.class);
2162 for (LeadingMarginSpan lms : spans) {
2163 margin += lms.getLeadingMargin(true);
2166 for (int i = 0; i < len; ++i) {
2167 if (chars[i] == '\t') {
2169 if (text instanceof Spanned) {
2170 Spanned spanned = (Spanned) text;
2171 int spanEnd = spanned.nextSpanTransition(start, end,
2173 TabStopSpan[] spans = getParagraphSpans(spanned, start, spanEnd,
2175 if (spans.length > 0) {
2176 tabStops = new TabStops(TAB_INCREMENT, spans);
2182 tl.set(paint, text, start, end, dir, directions, hasTabs, tabStops,
2183 0 /* ellipsisStart */, 0 /* ellipsisEnd */);
2184 return margin + Math.abs(tl.metrics(null));
2186 TextLine.recycle(tl);
2196 @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
2197 public static class TabStops {
2198 private float[] mStops;
2199 private int mNumStops;
2200 private float mIncrement;
2202 public TabStops(float increment, Object[] spans) {
2203 reset(increment, spans);
2206 void reset(float increment, Object[] spans) {
2207 this.mIncrement = increment;
2210 if (spans != null) {
2211 float[] stops = this.mStops;
2212 for (Object o : spans) {
2213 if (o instanceof TabStopSpan) {
2214 if (stops == null) {
2215 stops = new float[10];
2216 } else if (ns == stops.length) {
2217 float[] nstops = new float[ns * 2];
2218 for (int i = 0; i < ns; ++i) {
2219 nstops[i] = stops[i];
2223 stops[ns++] = ((TabStopSpan) o).getTabStop();
2227 Arrays.sort(stops, 0, ns);
2229 if (stops != this.mStops) {
2230 this.mStops = stops;
2233 this.mNumStops = ns;
2236 float nextTab(float h) {
2237 int ns = this.mNumStops;
2239 float[] stops = this.mStops;
2240 for (int i = 0; i < ns; ++i) {
2241 float stop = stops[i];
2247 return nextDefaultStop(h, mIncrement);
2251 * Returns the position of next tab stop.
2253 public static float nextDefaultStop(float h, float inc) {
2254 return ((int) ((h + inc) / inc)) * inc;
2259 * Returns the position of the next tab stop after h on the line.
2261 * @param text the text
2262 * @param start start of the line
2263 * @param end limit of the line
2264 * @param h the current horizontal offset
2265 * @param tabs the tabs, can be null. If it is null, any tabs in effect
2266 * on the line will be used. If there are no tabs, a default offset
2267 * will be used to compute the tab stop.
2268 * @return the offset of the next tab stop.
2270 /* package */ static float nextTab(CharSequence text, int start, int end,
2271 float h, Object[] tabs) {
2272 float nh = Float.MAX_VALUE;
2273 boolean alltabs = false;
2275 if (text instanceof Spanned) {
2277 tabs = getParagraphSpans((Spanned) text, start, end, TabStopSpan.class);
2281 for (int i = 0; i < tabs.length; i++) {
2283 if (!(tabs[i] instanceof TabStopSpan))
2287 int where = ((TabStopSpan) tabs[i]).getTabStop();
2289 if (where < nh && where > h)
2293 if (nh != Float.MAX_VALUE)
2297 return ((int) ((h + TAB_INCREMENT) / TAB_INCREMENT)) * TAB_INCREMENT;
2300 protected final boolean isSpanned() {
2301 return mSpannedText;
2305 * Returns the same as <code>text.getSpans()</code>, except where
2306 * <code>start</code> and <code>end</code> are the same and are not
2307 * at the very beginning of the text, in which case an empty array
2308 * is returned instead.
2310 * This is needed because of the special case that <code>getSpans()</code>
2311 * on an empty range returns the spans adjacent to that range, which is
2312 * primarily for the sake of <code>TextWatchers</code> so they will get
2313 * notifications when text goes from empty to non-empty. But it also
2314 * has the unfortunate side effect that if the text ends with an empty
2315 * paragraph, that paragraph accidentally picks up the styles of the
2316 * preceding paragraph (even though those styles will not be picked up
2317 * by new text that is inserted into the empty paragraph).
2319 * The reason it just checks whether <code>start</code> and <code>end</code>
2320 * is the same is that the only time a line can contain 0 characters
2321 * is if it is the final paragraph of the Layout; otherwise any line will
2322 * contain at least one printing or newline character. The reason for the
2323 * additional check if <code>start</code> is greater than 0 is that
2324 * if the empty paragraph is the entire content of the buffer, paragraph
2325 * styles that are already applied to the buffer will apply to text that
2326 * is inserted into it.
2328 /* package */static <T> T[] getParagraphSpans(Spanned text, int start, int end, Class<T> type) {
2329 if (start == end && start > 0) {
2330 return ArrayUtils.emptyArray(type);
2333 if(text instanceof SpannableStringBuilder) {
2334 return ((SpannableStringBuilder) text).getSpans(start, end, type, false);
2336 return text.getSpans(start, end, type);
2340 private void ellipsize(int start, int end, int line,
2341 char[] dest, int destoff, TextUtils.TruncateAt method) {
2342 final int ellipsisCount = getEllipsisCount(line);
2343 if (ellipsisCount == 0) {
2346 final int ellipsisStart = getEllipsisStart(line);
2347 final int lineStart = getLineStart(line);
2349 final String ellipsisString = TextUtils.getEllipsisString(method);
2350 final int ellipsisStringLen = ellipsisString.length();
2351 // Use the ellipsis string only if there are that at least as many characters to replace.
2352 final boolean useEllipsisString = ellipsisCount >= ellipsisStringLen;
2353 for (int i = 0; i < ellipsisCount; i++) {
2355 if (useEllipsisString && i < ellipsisStringLen) {
2356 c = ellipsisString.charAt(i);
2358 c = TextUtils.ELLIPSIS_FILLER;
2361 final int a = i + ellipsisStart + lineStart;
2362 if (start <= a && a < end) {
2363 dest[destoff + a - start] = c;
2369 * Stores information about bidirectional (left-to-right or right-to-left)
2370 * text within the layout of a line.
2372 public static class Directions {
2374 * Directions represents directional runs within a line of text. Runs are pairs of ints
2375 * listed in visual order, starting from the leading margin. The first int of each pair is
2376 * the offset from the first character of the line to the start of the run. The second int
2377 * represents both the length and level of the run. The length is in the lower bits,
2378 * accessed by masking with RUN_LENGTH_MASK. The level is in the higher bits, accessed by
2379 * shifting by RUN_LEVEL_SHIFT and masking by RUN_LEVEL_MASK. To simply test for an RTL
2380 * direction, test the bit using RUN_RTL_FLAG, if set then the direction is rtl.
2383 @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
2384 public int[] mDirections;
2389 @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
2390 public Directions(int[] dirs) {
2395 * Returns number of BiDi runs.
2399 public @IntRange(from = 0) int getRunCount() {
2400 return mDirections.length / 2;
2404 * Returns the start offset of the BiDi run.
2406 * @param runIndex the index of the BiDi run
2407 * @return the start offset of the BiDi run.
2410 public @IntRange(from = 0) int getRunStart(@IntRange(from = 0) int runIndex) {
2411 return mDirections[runIndex * 2];
2415 * Returns the length of the BiDi run.
2417 * Note that this method may return too large number due to reducing the number of object
2418 * allocations. The too large number means the remaining part is assigned to this run. The
2419 * caller must clamp the returned value.
2421 * @param runIndex the index of the BiDi run
2422 * @return the length of the BiDi run.
2425 public @IntRange(from = 0) int getRunLength(@IntRange(from = 0) int runIndex) {
2426 return mDirections[runIndex * 2 + 1] & RUN_LENGTH_MASK;
2430 * Returns true if the BiDi run is RTL.
2432 * @param runIndex the index of the BiDi run
2433 * @return true if the BiDi run is RTL.
2436 public boolean isRunRtl(int runIndex) {
2437 return (mDirections[runIndex * 2 + 1] & RUN_RTL_FLAG) != 0;
2442 * Return the offset of the first character to be ellipsized away,
2443 * relative to the start of the line. (So 0 if the beginning of the
2444 * line is ellipsized, not getLineStart().)
2446 public abstract int getEllipsisStart(int line);
2449 * Returns the number of characters to be ellipsized away, or 0 if
2450 * no ellipsis is to take place.
2452 public abstract int getEllipsisCount(int line);
2454 /* package */ static class Ellipsizer implements CharSequence, GetChars {
2455 /* package */ CharSequence mText;
2456 /* package */ Layout mLayout;
2457 /* package */ int mWidth;
2458 /* package */ TextUtils.TruncateAt mMethod;
2460 public Ellipsizer(CharSequence s) {
2464 public char charAt(int off) {
2465 char[] buf = TextUtils.obtain(1);
2466 getChars(off, off + 1, buf, 0);
2469 TextUtils.recycle(buf);
2473 public void getChars(int start, int end, char[] dest, int destoff) {
2474 int line1 = mLayout.getLineForOffset(start);
2475 int line2 = mLayout.getLineForOffset(end);
2477 TextUtils.getChars(mText, start, end, dest, destoff);
2479 for (int i = line1; i <= line2; i++) {
2480 mLayout.ellipsize(start, end, i, dest, destoff, mMethod);
2484 public int length() {
2485 return mText.length();
2488 public CharSequence subSequence(int start, int end) {
2489 char[] s = new char[end - start];
2490 getChars(start, end, s, 0);
2491 return new String(s);
2495 public String toString() {
2496 char[] s = new char[length()];
2497 getChars(0, length(), s, 0);
2498 return new String(s);
2503 /* package */ static class SpannedEllipsizer extends Ellipsizer implements Spanned {
2504 private Spanned mSpanned;
2506 public SpannedEllipsizer(CharSequence display) {
2508 mSpanned = (Spanned) display;
2511 public <T> T[] getSpans(int start, int end, Class<T> type) {
2512 return mSpanned.getSpans(start, end, type);
2515 public int getSpanStart(Object tag) {
2516 return mSpanned.getSpanStart(tag);
2519 public int getSpanEnd(Object tag) {
2520 return mSpanned.getSpanEnd(tag);
2523 public int getSpanFlags(Object tag) {
2524 return mSpanned.getSpanFlags(tag);
2527 @SuppressWarnings("rawtypes")
2528 public int nextSpanTransition(int start, int limit, Class type) {
2529 return mSpanned.nextSpanTransition(start, limit, type);
2533 public CharSequence subSequence(int start, int end) {
2534 char[] s = new char[end - start];
2535 getChars(start, end, s, 0);
2537 SpannableString ss = new SpannableString(new String(s));
2538 TextUtils.copySpansFrom(mSpanned, start, end, Object.class, ss, 0);
2543 private CharSequence mText;
2544 @UnsupportedAppUsage
2545 private TextPaint mPaint;
2546 private TextPaint mWorkPaint = new TextPaint();
2548 private Alignment mAlignment = Alignment.ALIGN_NORMAL;
2549 private float mSpacingMult;
2550 private float mSpacingAdd;
2551 private static final Rect sTempRect = new Rect();
2552 private boolean mSpannedText;
2553 private TextDirectionHeuristic mTextDir;
2554 private SpanSet<LineBackgroundSpan> mLineBackgroundSpans;
2555 private int mJustificationMode;
2558 @IntDef(prefix = { "DIR_" }, value = {
2562 @Retention(RetentionPolicy.SOURCE)
2563 public @interface Direction {}
2565 public static final int DIR_LEFT_TO_RIGHT = 1;
2566 public static final int DIR_RIGHT_TO_LEFT = -1;
2568 /* package */ static final int DIR_REQUEST_LTR = 1;
2569 /* package */ static final int DIR_REQUEST_RTL = -1;
2570 @UnsupportedAppUsage
2571 /* package */ static final int DIR_REQUEST_DEFAULT_LTR = 2;
2572 /* package */ static final int DIR_REQUEST_DEFAULT_RTL = -2;
2574 /* package */ static final int RUN_LENGTH_MASK = 0x03ffffff;
2575 /* package */ static final int RUN_LEVEL_SHIFT = 26;
2576 /* package */ static final int RUN_LEVEL_MASK = 0x3f;
2577 /* package */ static final int RUN_RTL_FLAG = 1 << RUN_LEVEL_SHIFT;
2579 public enum Alignment {
2584 @UnsupportedAppUsage
2587 @UnsupportedAppUsage
2591 private static final float TAB_INCREMENT = 20;
2594 @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
2595 @UnsupportedAppUsage
2596 public static final Directions DIRS_ALL_LEFT_TO_RIGHT =
2597 new Directions(new int[] { 0, RUN_LENGTH_MASK });
2600 @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
2601 @UnsupportedAppUsage
2602 public static final Directions DIRS_ALL_RIGHT_TO_LEFT =
2603 new Directions(new int[] { 0, RUN_LENGTH_MASK | RUN_RTL_FLAG });
2606 @Retention(RetentionPolicy.SOURCE)
2607 @IntDef(prefix = { "TEXT_SELECTION_LAYOUT_" }, value = {
2608 TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT,
2609 TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT
2611 public @interface TextSelectionLayout {}
2614 public static final int TEXT_SELECTION_LAYOUT_RIGHT_TO_LEFT = 0;
2616 public static final int TEXT_SELECTION_LAYOUT_LEFT_TO_RIGHT = 1;
2619 @FunctionalInterface
2620 public interface SelectionRectangleConsumer {
2622 * Performs this operation on the given rectangle.
2624 * @param left the left edge of the rectangle
2625 * @param top the top edge of the rectangle
2626 * @param right the right edge of the rectangle
2627 * @param bottom the bottom edge of the rectangle
2628 * @param textSelectionLayout the layout (RTL or LTR) of the text covered by this
2629 * selection rectangle
2631 void accept(float left, float top, float right, float bottom,
2632 @TextSelectionLayout int textSelectionLayout);