itk-viewer-bootstrap-ui/src/Main/toggleBackgroundColor.js

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function toggleBackgroundColor(context) {
  context.main.selectedBackgroundColor =
    (context.main.selectedBackgroundColor + 1) %
    context.main.backgroundColors.length
  context.main.backgroundColor =
    context.main.backgroundColors[context.main.selectedBackgroundColor]
}

export default toggleBackgroundColor