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StaticLayout.javaAPI DocAndroid 5.1 API34315Thu Mar 12 22:22:10 GMT 2015android.text

StaticLayout

public class StaticLayout extends Layout
StaticLayout is a Layout for text that will not be edited after it is laid out. Use {@link DynamicLayout} for text that may change.

This is used by widgets to control text layout. You should not need to use this class directly unless you are implementing your own widget or custom display object, or would be tempted to call {@link android.graphics.Canvas#drawText(java.lang.CharSequence, int, int, float, float, android.graphics.Paint) Canvas.drawText()} directly.

Fields Summary
static final String
TAG
private int
mLineCount
private int
mTopPadding
private int
mBottomPadding
private int
mColumns
private int
mEllipsizedWidth
private static final int
COLUMNS_NORMAL
private static final int
COLUMNS_ELLIPSIZE
private static final int
START
private static final int
DIR
private static final int
TAB
private static final int
TOP
private static final int
DESCENT
private static final int
ELLIPSIS_START
private static final int
ELLIPSIS_COUNT
private int[]
mLines
private Directions[]
mLineDirections
private int
mMaximumVisibleLineCount
private static final int
START_MASK
private static final int
DIR_SHIFT
private static final int
TAB_MASK
private static final int
TAB_INCREMENT
private static final char
CHAR_NEW_LINE
private static final char
CHAR_TAB
private static final char
CHAR_SPACE
private static final char
CHAR_ZWSP
private static final double
EXTRA_ROUNDING
private static final int
CHAR_FIRST_HIGH_SURROGATE
private static final int
CHAR_LAST_LOW_SURROGATE
private MeasuredText
mMeasured
private Paint.FontMetricsInt
mFontMetricsInt
Constructors Summary
public StaticLayout(CharSequence source, TextPaint paint, int width, Alignment align, float spacingmult, float spacingadd, boolean includepad)


        
                         
                             
                          
        this(source, 0, source.length(), paint, width, align,
             spacingmult, spacingadd, includepad);
public StaticLayout(CharSequence source, TextPaint paint, int width, Alignment align, TextDirectionHeuristic textDir, float spacingmult, float spacingadd, boolean includepad)

hide

        this(source, 0, source.length(), paint, width, align, textDir,
                spacingmult, spacingadd, includepad);
public StaticLayout(CharSequence source, int bufstart, int bufend, TextPaint paint, int outerwidth, Alignment align, float spacingmult, float spacingadd, boolean includepad)

        this(source, bufstart, bufend, paint, outerwidth, align,
             spacingmult, spacingadd, includepad, null, 0);
public StaticLayout(CharSequence source, int bufstart, int bufend, TextPaint paint, int outerwidth, Alignment align, TextDirectionHeuristic textDir, float spacingmult, float spacingadd, boolean includepad)

hide

        this(source, bufstart, bufend, paint, outerwidth, align, textDir,
                spacingmult, spacingadd, includepad, null, 0, Integer.MAX_VALUE);
public StaticLayout(CharSequence source, int bufstart, int bufend, TextPaint paint, int outerwidth, Alignment align, float spacingmult, float spacingadd, boolean includepad, TextUtils.TruncateAt ellipsize, int ellipsizedWidth)

        this(source, bufstart, bufend, paint, outerwidth, align,
                TextDirectionHeuristics.FIRSTSTRONG_LTR,
                spacingmult, spacingadd, includepad, ellipsize, ellipsizedWidth, Integer.MAX_VALUE);
public StaticLayout(CharSequence source, int bufstart, int bufend, TextPaint paint, int outerwidth, Alignment align, TextDirectionHeuristic textDir, float spacingmult, float spacingadd, boolean includepad, TextUtils.TruncateAt ellipsize, int ellipsizedWidth, int maxLines)

hide

        super((ellipsize == null)
                ? source
                : (source instanceof Spanned)
                    ? new SpannedEllipsizer(source)
                    : new Ellipsizer(source),
              paint, outerwidth, align, textDir, spacingmult, spacingadd);

        /*
         * This is annoying, but we can't refer to the layout until
         * superclass construction is finished, and the superclass
         * constructor wants the reference to the display text.
         *
         * This will break if the superclass constructor ever actually
         * cares about the content instead of just holding the reference.
         */
        if (ellipsize != null) {
            Ellipsizer e = (Ellipsizer) getText();

            e.mLayout = this;
            e.mWidth = ellipsizedWidth;
            e.mMethod = ellipsize;
            mEllipsizedWidth = ellipsizedWidth;

            mColumns = COLUMNS_ELLIPSIZE;
        } else {
            mColumns = COLUMNS_NORMAL;
            mEllipsizedWidth = outerwidth;
        }

        mLineDirections = ArrayUtils.newUnpaddedArray(Directions.class, 2 * mColumns);
        mLines = new int[mLineDirections.length];
        mMaximumVisibleLineCount = maxLines;

        mMeasured = MeasuredText.obtain();

        generate(source, bufstart, bufend, paint, outerwidth, textDir, spacingmult,
                 spacingadd, includepad, includepad, ellipsizedWidth,
                 ellipsize);

        mMeasured = MeasuredText.recycle(mMeasured);
        mFontMetricsInt = null;
StaticLayout(CharSequence text)

        super(text, null, 0, null, 0, 0);

        mColumns = COLUMNS_ELLIPSIZE;
        mLineDirections = ArrayUtils.newUnpaddedArray(Directions.class, 2 * mColumns);
        mLines = new int[mLineDirections.length];
        // FIXME This is never recycled
        mMeasured = MeasuredText.obtain();
Methods Summary
private voidcalculateEllipsis(int lineStart, int lineEnd, float[] widths, int widthStart, float avail, TextUtils.TruncateAt where, int line, float textWidth, TextPaint paint, boolean forceEllipsis)

        if (textWidth <= avail && !forceEllipsis) {
            // Everything fits!
            mLines[mColumns * line + ELLIPSIS_START] = 0;
            mLines[mColumns * line + ELLIPSIS_COUNT] = 0;
            return;
        }

        float ellipsisWidth = paint.measureText(
                (where == TextUtils.TruncateAt.END_SMALL) ?
                        TextUtils.ELLIPSIS_TWO_DOTS : TextUtils.ELLIPSIS_NORMAL, 0, 1);
        int ellipsisStart = 0;
        int ellipsisCount = 0;
        int len = lineEnd - lineStart;

        // We only support start ellipsis on a single line
        if (where == TextUtils.TruncateAt.START) {
            if (mMaximumVisibleLineCount == 1) {
                float sum = 0;
                int i;

                for (i = len; i >= 0; i--) {
                    float w = widths[i - 1 + lineStart - widthStart];

                    if (w + sum + ellipsisWidth > avail) {
                        break;
                    }

                    sum += w;
                }

                ellipsisStart = 0;
                ellipsisCount = i;
            } else {
                if (Log.isLoggable(TAG, Log.WARN)) {
                    Log.w(TAG, "Start Ellipsis only supported with one line");
                }
            }
        } else if (where == TextUtils.TruncateAt.END || where == TextUtils.TruncateAt.MARQUEE ||
                where == TextUtils.TruncateAt.END_SMALL) {
            float sum = 0;
            int i;

            for (i = 0; i < len; i++) {
                float w = widths[i + lineStart - widthStart];

                if (w + sum + ellipsisWidth > avail) {
                    break;
                }

                sum += w;
            }

            ellipsisStart = i;
            ellipsisCount = len - i;
            if (forceEllipsis && ellipsisCount == 0 && len > 0) {
                ellipsisStart = len - 1;
                ellipsisCount = 1;
            }
        } else {
            // where = TextUtils.TruncateAt.MIDDLE We only support middle ellipsis on a single line
            if (mMaximumVisibleLineCount == 1) {
                float lsum = 0, rsum = 0;
                int left = 0, right = len;

                float ravail = (avail - ellipsisWidth) / 2;
                for (right = len; right > 0; right--) {
                    float w = widths[right - 1 + lineStart - widthStart];

                    if (w + rsum > ravail) {
                        break;
                    }

                    rsum += w;
                }

                float lavail = avail - ellipsisWidth - rsum;
                for (left = 0; left < right; left++) {
                    float w = widths[left + lineStart - widthStart];

                    if (w + lsum > lavail) {
                        break;
                    }

                    lsum += w;
                }

                ellipsisStart = left;
                ellipsisCount = right - left;
            } else {
                if (Log.isLoggable(TAG, Log.WARN)) {
                    Log.w(TAG, "Middle Ellipsis only supported with one line");
                }
            }
        }

        mLines[mColumns * line + ELLIPSIS_START] = ellipsisStart;
        mLines[mColumns * line + ELLIPSIS_COUNT] = ellipsisCount;
voidfinish()

        mMeasured = MeasuredText.recycle(mMeasured);
voidgenerate(java.lang.CharSequence source, int bufStart, int bufEnd, TextPaint paint, int outerWidth, TextDirectionHeuristic textDir, float spacingmult, float spacingadd, boolean includepad, boolean trackpad, float ellipsizedWidth, TextUtils.TruncateAt ellipsize)

        int[] breakOpp = null;
        final String localeLanguageTag = paint.getTextLocale().toLanguageTag();

        mLineCount = 0;

        int v = 0;
        boolean needMultiply = (spacingmult != 1 || spacingadd != 0);

        Paint.FontMetricsInt fm = mFontMetricsInt;
        int[] chooseHtv = null;

        MeasuredText measured = mMeasured;

        Spanned spanned = null;
        if (source instanceof Spanned)
            spanned = (Spanned) source;

        int paraEnd;
        for (int paraStart = bufStart; paraStart <= bufEnd; paraStart = paraEnd) {
            paraEnd = TextUtils.indexOf(source, CHAR_NEW_LINE, paraStart, bufEnd);
            if (paraEnd < 0)
                paraEnd = bufEnd;
            else
                paraEnd++;

            int firstWidthLineLimit = mLineCount + 1;
            int firstWidth = outerWidth;
            int restWidth = outerWidth;

            LineHeightSpan[] chooseHt = null;

            if (spanned != null) {
                LeadingMarginSpan[] sp = getParagraphSpans(spanned, paraStart, paraEnd,
                        LeadingMarginSpan.class);
                for (int i = 0; i < sp.length; i++) {
                    LeadingMarginSpan lms = sp[i];
                    firstWidth -= sp[i].getLeadingMargin(true);
                    restWidth -= sp[i].getLeadingMargin(false);

                    // LeadingMarginSpan2 is odd.  The count affects all
                    // leading margin spans, not just this particular one
                    if (lms instanceof LeadingMarginSpan2) {
                        LeadingMarginSpan2 lms2 = (LeadingMarginSpan2) lms;
                        int lmsFirstLine = getLineForOffset(spanned.getSpanStart(lms2));
                        firstWidthLineLimit = Math.max(firstWidthLineLimit,
                                lmsFirstLine + lms2.getLeadingMarginLineCount());
                    }
                }

                chooseHt = getParagraphSpans(spanned, paraStart, paraEnd, LineHeightSpan.class);

                if (chooseHt.length != 0) {
                    if (chooseHtv == null ||
                        chooseHtv.length < chooseHt.length) {
                        chooseHtv = ArrayUtils.newUnpaddedIntArray(chooseHt.length);
                    }

                    for (int i = 0; i < chooseHt.length; i++) {
                        int o = spanned.getSpanStart(chooseHt[i]);

                        if (o < paraStart) {
                            // starts in this layout, before the
                            // current paragraph

                            chooseHtv[i] = getLineTop(getLineForOffset(o));
                        } else {
                            // starts in this paragraph

                            chooseHtv[i] = v;
                        }
                    }
                }
            }

            measured.setPara(source, paraStart, paraEnd, textDir);
            char[] chs = measured.mChars;
            float[] widths = measured.mWidths;
            byte[] chdirs = measured.mLevels;
            int dir = measured.mDir;
            boolean easy = measured.mEasy;

            breakOpp = nLineBreakOpportunities(localeLanguageTag, chs, paraEnd - paraStart, breakOpp);
            int breakOppIndex = 0;

            int width = firstWidth;

            float w = 0;
            // here is the offset of the starting character of the line we are currently measuring
            int here = paraStart;

            // ok is a character offset located after a word separator (space, tab, number...) where
            // we would prefer to cut the current line. Equals to here when no such break was found.
            int ok = paraStart;
            float okWidth = w;
            int okAscent = 0, okDescent = 0, okTop = 0, okBottom = 0;

            // fit is a character offset such that the [here, fit[ range fits in the allowed width.
            // We will cut the line there if no ok position is found.
            int fit = paraStart;
            float fitWidth = w;
            int fitAscent = 0, fitDescent = 0, fitTop = 0, fitBottom = 0;
            // same as fitWidth but not including any trailing whitespace
            float fitWidthGraphing = w;

            boolean hasTabOrEmoji = false;
            boolean hasTab = false;
            TabStops tabStops = null;

            for (int spanStart = paraStart, spanEnd; spanStart < paraEnd; spanStart = spanEnd) {

                if (spanned == null) {
                    spanEnd = paraEnd;
                    int spanLen = spanEnd - spanStart;
                    measured.addStyleRun(paint, spanLen, fm);
                } else {
                    spanEnd = spanned.nextSpanTransition(spanStart, paraEnd,
                            MetricAffectingSpan.class);
                    int spanLen = spanEnd - spanStart;
                    MetricAffectingSpan[] spans =
                            spanned.getSpans(spanStart, spanEnd, MetricAffectingSpan.class);
                    spans = TextUtils.removeEmptySpans(spans, spanned, MetricAffectingSpan.class);
                    measured.addStyleRun(paint, spans, spanLen, fm);
                }

                int fmTop = fm.top;
                int fmBottom = fm.bottom;
                int fmAscent = fm.ascent;
                int fmDescent = fm.descent;

                for (int j = spanStart; j < spanEnd; j++) {
                    char c = chs[j - paraStart];

                    if (c == CHAR_NEW_LINE) {
                        // intentionally left empty
                    } else if (c == CHAR_TAB) {
                        if (hasTab == false) {
                            hasTab = true;
                            hasTabOrEmoji = true;
                            if (spanned != null) {
                                // First tab this para, check for tabstops
                                TabStopSpan[] spans = getParagraphSpans(spanned, paraStart,
                                        paraEnd, TabStopSpan.class);
                                if (spans.length > 0) {
                                    tabStops = new TabStops(TAB_INCREMENT, spans);
                                }
                            }
                        }
                        if (tabStops != null) {
                            w = tabStops.nextTab(w);
                        } else {
                            w = TabStops.nextDefaultStop(w, TAB_INCREMENT);
                        }
                    } else if (c >= CHAR_FIRST_HIGH_SURROGATE && c <= CHAR_LAST_LOW_SURROGATE
                            && j + 1 < spanEnd) {
                        int emoji = Character.codePointAt(chs, j - paraStart);

                        if (emoji >= MIN_EMOJI && emoji <= MAX_EMOJI) {
                            Bitmap bm = EMOJI_FACTORY.getBitmapFromAndroidPua(emoji);

                            if (bm != null) {
                                Paint whichPaint;

                                if (spanned == null) {
                                    whichPaint = paint;
                                } else {
                                    whichPaint = mWorkPaint;
                                }

                                float wid = bm.getWidth() * -whichPaint.ascent() / bm.getHeight();

                                w += wid;
                                hasTabOrEmoji = true;
                                j++;
                            } else {
                                w += widths[j - paraStart];
                            }
                        } else {
                            w += widths[j - paraStart];
                        }
                    } else {
                        w += widths[j - paraStart];
                    }

                    boolean isSpaceOrTab = c == CHAR_SPACE || c == CHAR_TAB || c == CHAR_ZWSP;

                    if (w <= width || isSpaceOrTab) {
                        fitWidth = w;
                        if (!isSpaceOrTab) {
                            fitWidthGraphing = w;
                        }
                        fit = j + 1;

                        if (fmTop < fitTop)
                            fitTop = fmTop;
                        if (fmAscent < fitAscent)
                            fitAscent = fmAscent;
                        if (fmDescent > fitDescent)
                            fitDescent = fmDescent;
                        if (fmBottom > fitBottom)
                            fitBottom = fmBottom;

                        while (breakOpp[breakOppIndex] != -1
                                && breakOpp[breakOppIndex] < j - paraStart + 1) {
                            breakOppIndex++;
                        }
                        boolean isLineBreak = breakOppIndex < breakOpp.length &&
                                breakOpp[breakOppIndex] == j - paraStart + 1;

                        if (isLineBreak) {
                            okWidth = fitWidthGraphing;
                            ok = j + 1;

                            if (fitTop < okTop)
                                okTop = fitTop;
                            if (fitAscent < okAscent)
                                okAscent = fitAscent;
                            if (fitDescent > okDescent)
                                okDescent = fitDescent;
                            if (fitBottom > okBottom)
                                okBottom = fitBottom;
                        }
                    } else {
                        int endPos;
                        int above, below, top, bottom;
                        float currentTextWidth;

                        if (ok != here) {
                            endPos = ok;
                            above = okAscent;
                            below = okDescent;
                            top = okTop;
                            bottom = okBottom;
                            currentTextWidth = okWidth;
                        } else if (fit != here) {
                            endPos = fit;
                            above = fitAscent;
                            below = fitDescent;
                            top = fitTop;
                            bottom = fitBottom;
                            currentTextWidth = fitWidth;
                        } else {
                            // must make progress, so take next character
                            endPos = here + 1;
                            // but to deal properly with clusters
                            // take all zero width characters following that
                            while (endPos < spanEnd && widths[endPos - paraStart] == 0) {
                                endPos++;
                            }
                            above = fmAscent;
                            below = fmDescent;
                            top = fmTop;
                            bottom = fmBottom;
                            currentTextWidth = widths[here - paraStart];
                        }

                        int ellipseEnd = endPos;
                        if (mMaximumVisibleLineCount == 1 && ellipsize == TextUtils.TruncateAt.MIDDLE) {
                            ellipseEnd = paraEnd;
                        }
                        v = out(source, here, ellipseEnd,
                                above, below, top, bottom,
                                v, spacingmult, spacingadd, chooseHt,chooseHtv, fm, hasTabOrEmoji,
                                needMultiply, chdirs, dir, easy, bufEnd, includepad, trackpad,
                                chs, widths, paraStart, ellipsize, ellipsizedWidth,
                                currentTextWidth, paint, true);

                        here = endPos;
                        j = here - 1; // restart j-span loop from here, compensating for the j++
                        ok = fit = here;
                        w = 0;
                        fitWidthGraphing = w;
                        fitAscent = fitDescent = fitTop = fitBottom = 0;
                        okAscent = okDescent = okTop = okBottom = 0;

                        if (--firstWidthLineLimit <= 0) {
                            width = restWidth;
                        }

                        if (here < spanStart) {
                            // The text was cut before the beginning of the current span range.
                            // Exit the span loop, and get spanStart to start over from here.
                            measured.setPos(here);
                            spanEnd = here;
                            break;
                        }

                        if (mLineCount >= mMaximumVisibleLineCount) {
                            return;
                        }
                    }
                }
            }

            if (paraEnd != here && mLineCount < mMaximumVisibleLineCount) {
                if ((fitTop | fitBottom | fitDescent | fitAscent) == 0) {
                    paint.getFontMetricsInt(fm);

                    fitTop = fm.top;
                    fitBottom = fm.bottom;
                    fitAscent = fm.ascent;
                    fitDescent = fm.descent;
                }

                // Log.e("text", "output rest " + here + " to " + end);

                v = out(source,
                        here, paraEnd, fitAscent, fitDescent,
                        fitTop, fitBottom,
                        v,
                        spacingmult, spacingadd, chooseHt,
                        chooseHtv, fm, hasTabOrEmoji,
                        needMultiply, chdirs, dir, easy, bufEnd,
                        includepad, trackpad, chs,
                        widths, paraStart, ellipsize,
                        ellipsizedWidth, w, paint, paraEnd != bufEnd);
            }

            paraStart = paraEnd;

            if (paraEnd == bufEnd)
                break;
        }

        if ((bufEnd == bufStart || source.charAt(bufEnd - 1) == CHAR_NEW_LINE) &&
                mLineCount < mMaximumVisibleLineCount) {
            // Log.e("text", "output last " + bufEnd);

            measured.setPara(source, bufStart, bufEnd, textDir);

            paint.getFontMetricsInt(fm);

            v = out(source,
                    bufEnd, bufEnd, fm.ascent, fm.descent,
                    fm.top, fm.bottom,
                    v,
                    spacingmult, spacingadd, null,
                    null, fm, false,
                    needMultiply, measured.mLevels, measured.mDir, measured.mEasy, bufEnd,
                    includepad, trackpad, null,
                    null, bufStart, ellipsize,
                    ellipsizedWidth, 0, paint, false);
        }
public intgetBottomPadding()

        return mBottomPadding;
public intgetEllipsisCount(int line)

        if (mColumns < COLUMNS_ELLIPSIZE) {
            return 0;
        }

        return mLines[mColumns * line + ELLIPSIS_COUNT];
public intgetEllipsisStart(int line)

        if (mColumns < COLUMNS_ELLIPSIZE) {
            return 0;
        }

        return mLines[mColumns * line + ELLIPSIS_START];
public intgetEllipsizedWidth()

        return mEllipsizedWidth;
public booleangetLineContainsTab(int line)

        return (mLines[mColumns * line + TAB] & TAB_MASK) != 0;
public intgetLineCount()

        return mLineCount;
public intgetLineDescent(int line)

        int descent = mLines[mColumns * line + DESCENT];
        if (mMaximumVisibleLineCount > 0 && line >= mMaximumVisibleLineCount - 1 && // -1 intended
                line != mLineCount) {
            descent += getBottomPadding();
        }
        return descent;
public final DirectionsgetLineDirections(int line)

        return mLineDirections[line];
public intgetLineForVertical(int vertical)

        int high = mLineCount;
        int low = -1;
        int guess;
        int[] lines = mLines;
        while (high - low > 1) {
            guess = (high + low) >> 1;
            if (lines[mColumns * guess + TOP] > vertical){
                high = guess;
            } else {
                low = guess;
            }
        }
        if (low < 0) {
            return 0;
        } else {
            return low;
        }
public intgetLineStart(int line)

        return mLines[mColumns * line + START] & START_MASK;
public intgetLineTop(int line)

        int top = mLines[mColumns * line + TOP];
        if (mMaximumVisibleLineCount > 0 && line >= mMaximumVisibleLineCount &&
                line != mLineCount) {
            top += getBottomPadding();
        }
        return top;
public intgetParagraphDirection(int line)

        return mLines[mColumns * line + DIR] >> DIR_SHIFT;
public intgetTopPadding()

        return mTopPadding;
private static native int[]nLineBreakOpportunities(java.lang.String locale, char[] text, int length, int[] recycle)

private intout(java.lang.CharSequence text, int start, int end, int above, int below, int top, int bottom, int v, float spacingmult, float spacingadd, android.text.style.LineHeightSpan[] chooseHt, int[] chooseHtv, Paint.FontMetricsInt fm, boolean hasTabOrEmoji, boolean needMultiply, byte[] chdirs, int dir, boolean easy, int bufEnd, boolean includePad, boolean trackPad, char[] chs, float[] widths, int widthStart, TextUtils.TruncateAt ellipsize, float ellipsisWidth, float textWidth, TextPaint paint, boolean moreChars)
        int j = mLineCount;
        int off = j * mColumns;
        int want = off + mColumns + TOP;
        int[] lines = mLines;

        if (want >= lines.length) {
            Directions[] grow2 = ArrayUtils.newUnpaddedArray(
                    Directions.class, GrowingArrayUtils.growSize(want));
            System.arraycopy(mLineDirections, 0, grow2, 0,
                             mLineDirections.length);
            mLineDirections = grow2;

            int[] grow = new int[grow2.length];
            System.arraycopy(lines, 0, grow, 0, lines.length);
            mLines = grow;
            lines = grow;
        }

        if (chooseHt != null) {
            fm.ascent = above;
            fm.descent = below;
            fm.top = top;
            fm.bottom = bottom;

            for (int i = 0; i < chooseHt.length; i++) {
                if (chooseHt[i] instanceof LineHeightSpan.WithDensity) {
                    ((LineHeightSpan.WithDensity) chooseHt[i]).
                        chooseHeight(text, start, end, chooseHtv[i], v, fm, paint);

                } else {
                    chooseHt[i].chooseHeight(text, start, end, chooseHtv[i], v, fm);
                }
            }

            above = fm.ascent;
            below = fm.descent;
            top = fm.top;
            bottom = fm.bottom;
        }

        boolean firstLine = (j == 0);
        boolean currentLineIsTheLastVisibleOne = (j + 1 == mMaximumVisibleLineCount);
        boolean lastLine = currentLineIsTheLastVisibleOne || (end == bufEnd);

        if (firstLine) {
            if (trackPad) {
                mTopPadding = top - above;
            }

            if (includePad) {
                above = top;
            }
        }

        int extra;

        if (lastLine) {
            if (trackPad) {
                mBottomPadding = bottom - below;
            }

            if (includePad) {
                below = bottom;
            }
        }


        if (needMultiply && !lastLine) {
            double ex = (below - above) * (spacingmult - 1) + spacingadd;
            if (ex >= 0) {
                extra = (int)(ex + EXTRA_ROUNDING);
            } else {
                extra = -(int)(-ex + EXTRA_ROUNDING);
            }
        } else {
            extra = 0;
        }

        lines[off + START] = start;
        lines[off + TOP] = v;
        lines[off + DESCENT] = below + extra;

        v += (below - above) + extra;
        lines[off + mColumns + START] = end;
        lines[off + mColumns + TOP] = v;

        if (hasTabOrEmoji)
            lines[off + TAB] |= TAB_MASK;

        lines[off + DIR] |= dir << DIR_SHIFT;
        Directions linedirs = DIRS_ALL_LEFT_TO_RIGHT;
        // easy means all chars < the first RTL, so no emoji, no nothing
        // XXX a run with no text or all spaces is easy but might be an empty
        // RTL paragraph.  Make sure easy is false if this is the case.
        if (easy) {
            mLineDirections[j] = linedirs;
        } else {
            mLineDirections[j] = AndroidBidi.directions(dir, chdirs, start - widthStart, chs,
                    start - widthStart, end - start);
        }

        if (ellipsize != null) {
            // If there is only one line, then do any type of ellipsis except when it is MARQUEE
            // if there are multiple lines, just allow END ellipsis on the last line
            boolean forceEllipsis = moreChars && (mLineCount + 1 == mMaximumVisibleLineCount);

            boolean doEllipsis =
                        (((mMaximumVisibleLineCount == 1 && moreChars) || (firstLine && !moreChars)) &&
                                ellipsize != TextUtils.TruncateAt.MARQUEE) ||
                        (!firstLine && (currentLineIsTheLastVisibleOne || !moreChars) &&
                                ellipsize == TextUtils.TruncateAt.END);
            if (doEllipsis) {
                calculateEllipsis(start, end, widths, widthStart,
                        ellipsisWidth, ellipsize, j,
                        textWidth, paint, forceEllipsis);
            }
        }

        mLineCount++;
        return v;
    
voidprepare()
        mMeasured = MeasuredText.obtain();