onHighlightRect method

Implementation

void onHighlightRect(int? id, Map<String, dynamic> params) {
  _highlightElement?.debugHideHighlight();

  final ctx = dbgContext;
  if (ctx == null || document == null) {
    sendToFrontend(id, null);
    return;
  }

  // Accept either int or double values
  double _toDouble(dynamic v) {
    if (v is int) return v.toDouble();
    if (v is double) return v;
    return 0.0;
  }

  final double x = _toDouble(params['x'] ?? params['left']);
  final double y = _toDouble(params['y'] ?? params['top']);
  final double w = _toDouble(params['width']);
  final double h = _toDouble(params['height']);

  final double cx = x + (w > 0 ? w / 2 : 0);
  final double cy = y + (h > 0 ? h / 2 : 0);

  try {
    final rootRenderObject = document!.viewport!;
    final result = BoxHitTestResult();
    rootRenderObject.hitTest(result, position: Offset(cx, cy));
    var hitPath = result.path;
    if (hitPath.isNotEmpty) {
      // Skip non-element render targets
      final firstTarget = hitPath.first.target;
      if (firstTarget is WebFRenderImage ||
          (firstTarget is RenderBoxModel && firstTarget.renderStyle.target.pointer == null)) {
        hitPath = hitPath.skip(1);
      }

      if (hitPath.isNotEmpty && hitPath.first.target is RenderBoxModel) {
        final ro = hitPath.first.target as RenderBoxModel;
        final element = ro.renderStyle.target;
        element.debugHighlight();
        _highlightElement = element;
      }
    }
  } catch (_) {}

  sendToFrontend(id, null);
}