resolveBackgroundPosition static method

CSSBackgroundPosition resolveBackgroundPosition(String input, RenderStyle renderStyle, String propertyName, bool isHorizontal,)

Parse background-position-x/background-position-y from string to CSSBackgroundPosition type.

Implementation

static CSSBackgroundPosition resolveBackgroundPosition(
    String input, RenderStyle renderStyle, String propertyName, bool isHorizontal) {
  dynamic calcValue = CSSCalcValue.tryParse(renderStyle, propertyName, input);
  if (calcValue != null && calcValue is CSSCalcValue) {
    return CSSBackgroundPosition(calcValue: calcValue);
  }
  if (CSSPercentage.isPercentage(input)) {
    return CSSBackgroundPosition(percentage: _gatValuePercentage(input));
  } else if (CSSLength.isLength(input)) {
    return CSSBackgroundPosition(length: CSSLength.parseLength(input, renderStyle, propertyName));
  } else {
    if (isHorizontal) {
      switch (input) {
        case LEFT:
          return CSSBackgroundPosition(percentage: -1);
        case RIGHT:
          return CSSBackgroundPosition(percentage: 1);
        case CENTER:
          return CSSBackgroundPosition(percentage: 0);
        default:
          return CSSBackgroundPosition(percentage: -1);
      }
    } else {
      switch (input) {
        case TOP:
          return CSSBackgroundPosition(percentage: -1);
        case BOTTOM:
          return CSSBackgroundPosition(percentage: 1);
        case CENTER:
          return CSSBackgroundPosition(percentage: 0);
        default:
          return CSSBackgroundPosition(percentage: -1);
      }
    }
  }
}