relayoutParagraphToWidth method

Implementation

void relayoutParagraphToWidth(double width) {
  if (!width.isFinite || width <= 0) return;
  // Make the container's content logical width definite so descendants with
  // percentage widths (e.g., <img width:50%>) can resolve against it.
  final RenderBoxModel container = this.container as RenderBoxModel;
  final CSSRenderStyle cStyle = container.renderStyle;
  cStyle.contentBoxLogicalWidth = width;

  // Rebuild and layout the paragraph at the resolved width so that:
  //  - atomic inline items are remeasured with updated constraints
  //  - placeholders get refreshed with new sizes
  // Use loose vertical constraints; height grows with content.
  final BoxConstraints c = BoxConstraints(
    minWidth: 0,
    maxWidth: width,
    minHeight: 0,
    maxHeight: double.infinity,
  );
  // Perform a full two-pass build like initial layout() to keep behavior consistent.
  _suppressAllRightExtras = true;
  _forceRightExtrasOwners.clear();
  _buildAndLayoutParagraph(c);
  final bool needsVARebuild = _computeTextRunBaselineOffsets() | _computeAtomicBaselineOffsets();
  _forceRightExtrasOwners.clear();
  // Enable right-extras only for single-line owners (pass 2) as in initial layout.
  for (final entry in _elementRanges.entries) {
    final box = entry.key;
    final (int sIdx, int eIdx) = entry.value;
    if (eIdx <= sIdx || _paragraph == null) continue;
    final styleR = box.renderStyle;
    final double extraR = styleR.paddingRight.computedValue +
        styleR.effectiveBorderRightWidth.computedValue +
        styleR.marginRight.computedValue;
    if (extraR <= 0) continue;
    final rects = _paragraph!.getBoxesForRange(sIdx, eIdx);
    if (rects.isEmpty) continue;
    final int firstLine = _lineIndexForRect(rects.first);
    final int lastLine = _lineIndexForRect(rects.last);
    if (firstLine >= 0 && firstLine == lastLine) {
      _forceRightExtrasOwners.add(box);
    }
  }
  if (_forceRightExtrasOwners.isNotEmpty || needsVARebuild) {
    _suppressAllRightExtras = false;
    _buildAndLayoutParagraph(c);
  }
}