createElementRect method

@override Rect? createElementRect(Element element, Rect? parentRect)

Create rect from RenderBox

Implementation

@override
Rect? createElementRect(Element element, Rect? parentRect) {
  final RenderDecoratedBox renderDecoratedBox =
      element.renderObject as RenderDecoratedBox;
  if (!renderDecoratedBox.hasSize) {
    return null;
  }
  if (!(renderDecoratedBox.decoration is BoxDecoration)) {
    return null;
  }
  final BoxDecoration decoration =
      renderDecoratedBox.decoration as BoxDecoration;

  double renderBoxWidth = renderDecoratedBox.size.width;
  final double renderBoxHeight = renderDecoratedBox.size.height;
  if (decoration.shape == BoxShape.circle) {
    if (renderBoxWidth > renderBoxHeight) {
      renderBoxWidth = renderBoxHeight;
    }
  }

  final offset = renderDecoratedBox.localToGlobal(Offset.zero);
  double? top = offset.dy;
  double? left = offset.dx;

  const AlignmentGeometry? alignment = Alignment.center;

  if (alignment == Alignment.centerLeft ||
      alignment == Alignment.bottomLeft ||
      alignment == Alignment.topLeft) {
  } else if (alignment == Alignment.bottomRight ||
      alignment == Alignment.centerRight ||
      alignment == Alignment.topRight) {
    left = offset.dx + renderDecoratedBox.size.width - renderBoxWidth;
  } else {
    left = offset.dx + (renderDecoratedBox.size.width - renderBoxWidth) / 2;
  }

  if (alignment == Alignment.topLeft ||
      alignment == Alignment.topCenter ||
      alignment == Alignment.topRight) {
  } else if (alignment == Alignment.bottomRight ||
      alignment == Alignment.bottomLeft ||
      alignment == Alignment.bottomCenter) {
    top = offset.dy + renderDecoratedBox.size.height - renderBoxHeight;
  } else {
    top = offset.dy + (renderDecoratedBox.size.height - renderBoxHeight) / 2;
  }

  return Rect.fromLTWH(
    left,
    top,
    renderBoxWidth,
    renderBoxHeight,
  );
}