getLeftArea method

Implementation

@override
Rect? getLeftArea() {
  Offset o = Offset(_offset?.dx ?? 0, _offset?.dy ?? 0);
  if (getRenderObject() is RenderBox) {
    Offset po = (getRenderObject() as RenderBox).localToGlobal(
      Offset.zero,
      ancestor: getMindMap()?.getRenderObject(),
    );
    o = Offset(o.dx + po.dx, o.dy + po.dy);
  }

  Rect rect = Rect.fromLTRB(
    o.dx - getHSpace() * 2,
    o.dy - getVSpace(),
    o.dx,
    o.dy + (_size?.height ?? 0) + getVSpace(),
  );
  if (getLeftItems().isNotEmpty) {
    double l = rect.left;
    double t = rect.top;
    double b = rect.bottom;
    for (IMindMapNode n in getLeftItems()) {
      Offset o = n.getOffset() ?? Offset.zero;
      if (n.getRenderObject() is RenderBox) {
        Offset po = (n.getRenderObject() as RenderBox).localToGlobal(
          Offset.zero,
          ancestor: getMindMap()?.getRenderObject(),
        );
        if (o.dx + po.dx < l) {
          l = o.dx + po.dx;
        }
        if (o.dy + po.dy - getVSpace() < t) {
          t = o.dy + po.dy - getVSpace();
        }
        if (o.dy + po.dy + (n.getSize()?.height ?? 0) + getVSpace() > b) {
          b = o.dy + po.dy + (n.getSize()?.height ?? 0) + getVSpace();
        }
      }
    }
    rect = Rect.fromLTRB(l, t, rect.right, b);
  }
  return rect;
}