forEach method

void forEach(bool cb(int id, double left, double top, double width, double height,))

Visit all objects in this QuadTree. The walk stops when it iterates over all objects or when the callback returns false.

Implementation

void forEach(
  bool Function(
    int id,
    double left,
    double top,
    double width,
    double height,
  ) cb,
) {
  final root = _root;
  if (root == null) return;
  var offset = 0;
  if (root._subdivided) {
    for (var i = 0; i < _nextObjectId; i++) {
      if (_id2node[i] == 0) continue;
      offset = i * _objectSize;
      final next = cb(
        i, // id of the object
        _objects[offset + 0], // left
        _objects[offset + 1], // top
        _objects[offset + 2], // width
        _objects[offset + 3], // height
      );
      if (next) continue;
      break;
    }
  } else {
    final rootIds = root._ids;
    for (final id in rootIds) {
      offset = id * _objectSize;
      final next = cb(
        id, // id of the object
        _objects[offset + 0], // left
        _objects[offset + 1], // top
        _objects[offset + 2], // width
        _objects[offset + 3], // height
      );
      if (next) continue;
      break;
    }
  }
}