android.text.style.LeadingMarginSpan.LeadingMarginSpan2 Java Examples

/**
 * Returns the effective leading margin (unsigned) for this line,
 * taking into account LeadingMarginSpan and LeadingMarginSpan2.
 * @param line the line index
 * @return the leading margin of this line
 */
private int getParagraphLeadingMargin(int line) {
    if (!mSpannedText) {
        return 0;
    }
    Spanned spanned = (Spanned) mText;

    int lineStart = getLineStart(line);
    int lineEnd = getLineEnd(line);
    int spanEnd = spanned.nextSpanTransition(lineStart, lineEnd,
            LeadingMarginSpan.class);
    LeadingMarginSpan[] spans = getParagraphSpans(spanned, lineStart, spanEnd,
                                            LeadingMarginSpan.class);
    if (spans.length == 0) {
        return 0; // no leading margin span;
    }

    int margin = 0;

    boolean useFirstLineMargin = lineStart == 0 || spanned.charAt(lineStart - 1) == '\n';
    for (int i = 0; i < spans.length; i++) {
        if (spans[i] instanceof LeadingMarginSpan2) {
            int spStart = spanned.getSpanStart(spans[i]);
            int spanLine = getLineForOffset(spStart);
            int count = ((LeadingMarginSpan2) spans[i]).getLeadingMarginLineCount();
            // if there is more than one LeadingMarginSpan2, use the count that is greatest
            useFirstLineMargin |= line < spanLine + count;
        }
    }
    for (int i = 0; i < spans.length; i++) {
        LeadingMarginSpan span = spans[i];
        margin += span.getLeadingMargin(useFirstLineMargin);
    }

    return margin;
}
 

void addParagraphLines() {
    float leadingLineExtent = layoutWidth;
    float trailingLineExtent = layoutWidth;

    // Extract all spans of this paragraph.
    paragraphSpans = mSpanned.getSpans(charStart, charEnd, ParagraphStyle.class);

    // Compute margins for leading and trailing lines.
    for (ParagraphStyle style : paragraphSpans) {
        if (style instanceof LeadingMarginSpan) {
            LeadingMarginSpan span = (LeadingMarginSpan) style;
            leadingLineExtent -= span.getLeadingMargin(true);
            trailingLineExtent -= span.getLeadingMargin(false);

            if (span instanceof LeadingMarginSpan2) {
                LeadingMarginSpan2 span2 = (LeadingMarginSpan2) span;
                int spanTotalLines = span2.getLeadingMarginLineCount();
                if (spanTotalLines > leadingLineCount) {
                    leadingLineCount = spanTotalLines;
                }
            }
        }
    }

    // Extract line height spans and create font metrics if necessary.
    pickHeightSpans = mSpanned.getSpans(charStart, charEnd, LineHeightSpan.class);
    int chooseHeightCount = pickHeightSpans.length;
    if (chooseHeightCount > 0 && fontMetrics == null) {
        fontMetrics = new Paint.FontMetricsInt();
    }

    // Setup array for caching top of first line related to each line height span.
    if (pickHeightTops == null || pickHeightTops.length < chooseHeightCount) {
        pickHeightTops = new int[chooseHeightCount];
    }

    // Compute top of first line related to each line height span.
    for (int i = 0; i < chooseHeightCount; i++) {
        int spanStart = mSpanned.getSpanStart(pickHeightSpans[i]);
        int spanTop = (int) (lineTop + 0.5f);

        // Fix span top in case it starts in a previous paragraph.
        if (spanStart < charStart) {
            int lineIndex = binarySearch(spanStart);
            ComposedLine spanLine = frameLines.get(lineIndex);
            spanTop = (int) (spanLine.getTop() + 0.5f);
        }

        pickHeightTops[i] = spanTop;
    }

    float flushFactor = computeFlushFactor();
    lineExtent = leadingLineExtent;
    resolveLeadingOffset();

    // Iterate over each line of this paragraph.
    int lineStart = charStart;
    while (lineStart != charEnd) {
        int lineEnd = BreakResolver.suggestForwardBreak(mSpanned, mRuns, mBreaks, lineStart, charEnd, lineExtent, BreakMode.LINE);
        ComposedLine composedLine = mLineResolver.createSimpleLine(lineStart, lineEnd);
        prepareLine(composedLine, flushFactor);

        float lineHeight = composedLine.getHeight();

        // Make sure that at least one line is added even if frame is smaller in height.
        if ((lineTop + lineHeight) > layoutHeight && frameLines.size() > 0) {
            filled = true;
            return;
        }

        frameLines.add(composedLine);
        lastFlushFactor = flushFactor;

        // Stop the filling process if maximum lines have been added.
        if (frameLines.size() == maxLines) {
            filled = true;
            return;
        }

        // Find out extent of next line.
        if (--leadingLineCount <= 0) {
            lineExtent = trailingLineExtent;
            resolveLeadingOffset();
        }

        lineStart = lineEnd;
        lineTop += lineHeight;
    }
}