DiffColors.of constructor

DiffColors.of(SyntaxTheme theme)

Reads the colors from theme. A theme without them gets GitHub's green and red, with line backgrounds at half the strength of changed-word backgrounds.

Implementation

factory DiffColors.of(SyntaxTheme theme) {
  final dark = theme.isDark;
  final inserted =
      theme.editorColor('editorGutter.addedBackground') ??
      (dark ? 0xFF3FB950 : 0xFF1A7F37);
  final removed =
      theme.editorColor('editorGutter.deletedBackground') ??
      (dark ? 0xFFF85149 : 0xFFCF222E);
  final insertedText =
      theme.editorColor('diffEditor.insertedTextBackground') ??
      _withAlpha(inserted, 0x4D);
  final removedText =
      theme.editorColor('diffEditor.removedTextBackground') ??
      _withAlpha(removed, 0x4D);
  // Chrome is the foreground mixed into the background.
  int tint(double share) => alphaBlend(
    (share * 0xFF).round() << 24 | theme.foreground & 0xFFFFFF,
    theme.background,
  );
  return DiffColors(
    fileHeader: tint(0.06),
    hunkHeader: tint(0.035),
    emptySide: tint(0.02),
    divider: tint(0.12),
    muted: tint(0.62),
    insertedLine:
        theme.editorColor('diffEditor.insertedLineBackground') ??
        _withAlpha(insertedText, _alpha(insertedText) ~/ 2),
    removedLine:
        theme.editorColor('diffEditor.removedLineBackground') ??
        _withAlpha(removedText, _alpha(removedText) ~/ 2),
    insertedText: insertedText,
    removedText: removedText,
    inserted: inserted,
    removed: removed,
  );
}