ItalicReplacementSpan.java 文件源码

private void setHeightIfNeed(CharSequence text, @IntRange(from = 0) int start, @IntRange(from = 0) int end, @Nullable Paint.FontMetricsInt fm) {
  if (fm != null && text.length() == end - start) {
    // Extending classes can set the height of the span by updating
    // attributes of {@link android.graphics.Paint.FontMetricsInt}. If the span covers the whole
    // text, and the height is not set,
    // {@link #draw(Canvas, CharSequence, int, int, float, int, int, int, Paint)} will not be
    // called for the span.
    fm.top = mRect.top;
    fm.bottom = mRect.bottom;
  }
}