scale method

FolderNodeTheme<T> scale(double factor, { required double defaultFontSize, })

Returns a scaled copy with all spatial fields and text size multiplied by factor.

Scales: width, height, padding, margin, textStyle (font size + letter spacing), and the style textStyleResolver returns, by the same rule. A null from the resolver stays null, so the fallback is unchanged. Does NOT scale: tooltipTheme. Tooltips are classified as chrome and excluded from Scale — see ADR-0004.

defaultFontSize is used to resolve a null TextStyle.fontSize before scaling — callers should pass Theme.of(context).textTheme.bodyMedium?.fontSize.

Identity: scale(1.0, defaultFontSize: …) returns this.

Implementation

FolderNodeTheme<T> scale(double factor, {required double defaultFontSize}) {
  assert(factor > 0, 'scale factor must be > 0, got $factor');
  if (factor == 1.0) return this;
  return copyWith(
    width: width * factor,
    height: height * factor,
    padding: padding * factor,
    margin: margin * factor,
    textStyle: scaleTextStyle(textStyle, factor, defaultFontSize),
    textStyleResolver: textStyleResolver == null
        ? null
        : (node) {
            final style = textStyleResolver!(node);
            return style == null
                ? null
                : scaleTextStyle(style, factor, defaultFontSize);
          },
    // tooltipTheme intentionally not delegated — ADR-0004 (chrome).
  );
}