layout method

  1. @override
void layout(
  1. TreeMapNode root,
  2. Rect area
)
override

给定一个区域范围和节点，对该节点的Children进行布局(不包含孩子的孩子)

Implementation

@override
void layout(TreeMapNode root, Rect area) {
  layoutChildren(area, root.children);
}