Examples with MetricAffectingSpan android.text.style.MetricAffectingSpan used on opensource projects

Example 31 with MetricAffectingSpan

use of android.text.style.MetricAffectingSpan in project android_frameworks_base by crdroidandroid.

the class StaticLayout method generate.

/* package */
void generate(Builder b, boolean includepad, boolean trackpad) {
    CharSequence source = b.mText;
    int bufStart = b.mStart;
    int bufEnd = b.mEnd;
    TextPaint paint = b.mPaint;
    int outerWidth = b.mWidth;
    TextDirectionHeuristic textDir = b.mTextDir;
    float spacingmult = b.mSpacingMult;
    float spacingadd = b.mSpacingAdd;
    float ellipsizedWidth = b.mEllipsizedWidth;
    TextUtils.TruncateAt ellipsize = b.mEllipsize;
    // TODO: move to builder to avoid allocation costs
    LineBreaks lineBreaks = new LineBreaks();
    // store span end locations
    int[] spanEndCache = new int[4];
    // store fontMetrics per span range
    // must be a multiple of 4 (and > 0) (store top, bottom, ascent, and descent per range)
    int[] fmCache = new int[4 * 4];
    // TODO: also respect LocaleSpan within the text
    b.setLocale(paint.getTextLocale());
    mLineCount = 0;
    int v = 0;
    boolean needMultiply = (spacingmult != 1 || spacingadd != 0);
    Paint.FontMetricsInt fm = b.mFontMetricsInt;
    int[] chooseHtv = null;
    MeasuredText measured = b.mMeasuredText;
    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 firstWidthLineCount = 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);
                // leading margin spans, not just this particular one
                if (lms instanceof LeadingMarginSpan2) {
                    LeadingMarginSpan2 lms2 = (LeadingMarginSpan2) lms;
                    firstWidthLineCount = Math.max(firstWidthLineCount, lms2.getLeadingMarginLineCount());
                }
            }
            chooseHt = getParagraphSpans(spanned, paraStart, paraEnd, LineHeightSpan.class);
            if (chooseHt.length == 0) {
                // So that out() would not assume it has any contents
                chooseHt = null;
            } else {
                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, b);
        char[] chs = measured.mChars;
        float[] widths = measured.mWidths;
        byte[] chdirs = measured.mLevels;
        int dir = measured.mDir;
        boolean easy = measured.mEasy;
        // tab stop locations
        int[] variableTabStops = null;
        if (spanned != null) {
            TabStopSpan[] spans = getParagraphSpans(spanned, paraStart, paraEnd, TabStopSpan.class);
            if (spans.length > 0) {
                int[] stops = new int[spans.length];
                for (int i = 0; i < spans.length; i++) {
                    stops[i] = spans[i].getTabStop();
                }
                Arrays.sort(stops, 0, stops.length);
                variableTabStops = stops;
            }
        }
        nSetupParagraph(b.mNativePtr, chs, paraEnd - paraStart, firstWidth, firstWidthLineCount, restWidth, variableTabStops, TAB_INCREMENT, b.mBreakStrategy, b.mHyphenationFrequency);
        if (mLeftIndents != null || mRightIndents != null) {
            // TODO(raph) performance: it would be better to do this once per layout rather
            // than once per paragraph, but that would require a change to the native
            // interface.
            int leftLen = mLeftIndents == null ? 0 : mLeftIndents.length;
            int rightLen = mRightIndents == null ? 0 : mRightIndents.length;
            int indentsLen = Math.max(1, Math.max(leftLen, rightLen) - mLineCount);
            int[] indents = new int[indentsLen];
            for (int i = 0; i < indentsLen; i++) {
                int leftMargin = mLeftIndents == null ? 0 : mLeftIndents[Math.min(i + mLineCount, leftLen - 1)];
                int rightMargin = mRightIndents == null ? 0 : mRightIndents[Math.min(i + mLineCount, rightLen - 1)];
                indents[i] = leftMargin + rightMargin;
            }
            nSetIndents(b.mNativePtr, indents);
        }
        // measurement has to be done before performing line breaking
        // but we don't want to recompute fontmetrics or span ranges the
        // second time, so we cache those and then use those stored values
        int fmCacheCount = 0;
        int spanEndCacheCount = 0;
        for (int spanStart = paraStart, spanEnd; spanStart < paraEnd; spanStart = spanEnd) {
            if (fmCacheCount * 4 >= fmCache.length) {
                int[] grow = new int[fmCacheCount * 4 * 2];
                System.arraycopy(fmCache, 0, grow, 0, fmCacheCount * 4);
                fmCache = grow;
            }
            if (spanEndCacheCount >= spanEndCache.length) {
                int[] grow = new int[spanEndCacheCount * 2];
                System.arraycopy(spanEndCache, 0, grow, 0, spanEndCacheCount);
                spanEndCache = grow;
            }
            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);
            }
            // the order of storage here (top, bottom, ascent, descent) has to match the code below
            // where these values are retrieved
            fmCache[fmCacheCount * 4 + 0] = fm.top;
            fmCache[fmCacheCount * 4 + 1] = fm.bottom;
            fmCache[fmCacheCount * 4 + 2] = fm.ascent;
            fmCache[fmCacheCount * 4 + 3] = fm.descent;
            fmCacheCount++;
            spanEndCache[spanEndCacheCount] = spanEnd;
            spanEndCacheCount++;
        }
        nGetWidths(b.mNativePtr, widths);
        int breakCount = nComputeLineBreaks(b.mNativePtr, lineBreaks, lineBreaks.breaks, lineBreaks.widths, lineBreaks.flags, lineBreaks.breaks.length);
        int[] breaks = lineBreaks.breaks;
        float[] lineWidths = lineBreaks.widths;
        int[] flags = lineBreaks.flags;
        final int remainingLineCount = mMaximumVisibleLineCount - mLineCount;
        final boolean ellipsisMayBeApplied = ellipsize != null && (ellipsize == TextUtils.TruncateAt.END || (mMaximumVisibleLineCount == 1 && ellipsize != TextUtils.TruncateAt.MARQUEE));
        if (remainingLineCount > 0 && remainingLineCount < breakCount && ellipsisMayBeApplied) {
            // Calculate width and flag.
            float width = 0;
            int flag = 0;
            for (int i = remainingLineCount - 1; i < breakCount; i++) {
                if (i == breakCount - 1) {
                    width += lineWidths[i];
                } else {
                    for (int j = (i == 0 ? 0 : breaks[i - 1]); j < breaks[i]; j++) {
                        width += widths[j];
                    }
                }
                flag |= flags[i] & TAB_MASK;
            }
            // Treat the last line and overflowed lines as a single line.
            breaks[remainingLineCount - 1] = breaks[breakCount - 1];
            lineWidths[remainingLineCount - 1] = width;
            flags[remainingLineCount - 1] = flag;
            breakCount = remainingLineCount;
        }
        // here is the offset of the starting character of the line we are currently measuring
        int here = paraStart;
        int fmTop = 0, fmBottom = 0, fmAscent = 0, fmDescent = 0;
        int fmCacheIndex = 0;
        int spanEndCacheIndex = 0;
        int breakIndex = 0;
        for (int spanStart = paraStart, spanEnd; spanStart < paraEnd; spanStart = spanEnd) {
            // retrieve end of span
            spanEnd = spanEndCache[spanEndCacheIndex++];
            // retrieve cached metrics, order matches above
            fm.top = fmCache[fmCacheIndex * 4 + 0];
            fm.bottom = fmCache[fmCacheIndex * 4 + 1];
            fm.ascent = fmCache[fmCacheIndex * 4 + 2];
            fm.descent = fmCache[fmCacheIndex * 4 + 3];
            fmCacheIndex++;
            if (fm.top < fmTop) {
                fmTop = fm.top;
            }
            if (fm.ascent < fmAscent) {
                fmAscent = fm.ascent;
            }
            if (fm.descent > fmDescent) {
                fmDescent = fm.descent;
            }
            if (fm.bottom > fmBottom) {
                fmBottom = fm.bottom;
            }
            // skip breaks ending before current span range
            while (breakIndex < breakCount && paraStart + breaks[breakIndex] < spanStart) {
                breakIndex++;
            }
            while (breakIndex < breakCount && paraStart + breaks[breakIndex] <= spanEnd) {
                int endPos = paraStart + breaks[breakIndex];
                boolean moreChars = (endPos < bufEnd);
                v = out(source, here, endPos, fmAscent, fmDescent, fmTop, fmBottom, v, spacingmult, spacingadd, chooseHt, chooseHtv, fm, flags[breakIndex], needMultiply, chdirs, dir, easy, bufEnd, includepad, trackpad, chs, widths, paraStart, ellipsize, ellipsizedWidth, lineWidths[breakIndex], paint, moreChars);
                if (endPos < spanEnd) {
                    // preserve metrics for current span
                    fmTop = fm.top;
                    fmBottom = fm.bottom;
                    fmAscent = fm.ascent;
                    fmDescent = fm.descent;
                } else {
                    fmTop = fmBottom = fmAscent = fmDescent = 0;
                }
                here = endPos;
                breakIndex++;
                if (mLineCount >= mMaximumVisibleLineCount) {
                    return;
                }
            }
        }
        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, bufEnd, bufEnd, textDir, b);
        paint.getFontMetricsInt(fm);
        v = out(source, bufEnd, bufEnd, fm.ascent, fm.descent, fm.top, fm.bottom, v, spacingmult, spacingadd, null, null, fm, 0, needMultiply, measured.mLevels, measured.mDir, measured.mEasy, bufEnd, includepad, trackpad, null, null, bufStart, ellipsize, ellipsizedWidth, 0, paint, false);
    }
}

Example 32 with MetricAffectingSpan

use of android.text.style.MetricAffectingSpan in project TextJustify-Android by bluejamesbond.

the class Styled method getTextWidths.

/**
 * Returns the advance widths for a uniform left-to-right run of text with
 * no style changes in the middle of the run. If any style is replacement
 * text, the first character will isCancelled the width of the replacement and the
 * remaining characters will isCancelled a width of 0.
 *
 * @param paint     the paint, will not be modified
 * @param workPaint a paint to modify; on return will reflect the original
 *                  paint plus the effect of all spans on the run
 * @param text      the text
 * @param start     the start of the run
 * @param end       the limit of the run
 * @param widths    array to receive the advance widths of the characters. Must
 *                  be at least a large as (end - start).
 * @param fmi       FontMetrics information; can be null
 * @return the actual number of widths returned
 */
public static int getTextWidths(TextPaint paint, TextPaint workPaint, Spanned text, int start, int end, float[] widths, Paint.FontMetricsInt fmi) {
    MetricAffectingSpan[] spans = text.getSpans(start, end, MetricAffectingSpan.class);
    ReplacementSpan replacement = null;
    workPaint.set(paint);
    for (MetricAffectingSpan span : spans) {
        if (span instanceof ReplacementSpan) {
            replacement = (ReplacementSpan) span;
        } else {
            span.updateMeasureState(workPaint);
        }
    }
    if (replacement == null) {
        workPaint.getFontMetricsInt(fmi);
        workPaint.getTextWidths(text, start, end, widths);
    } else {
        int wid = replacement.getSize(workPaint, text, start, end, fmi);
        if (end > start) {
            widths[0] = wid;
            for (int i = start + 1; i < end; i++) {
                widths[i - start] = 0;
            }
        }
    }
    return end - start;
}