setLazy method
Implementation
void setLazy(RenderNode node, bool isLazy) {
  node._isLazyLoad = isLazy;
  for (var childNode in node._children) {
    setLazy(childNode, isLazy);
  }
}
void setLazy(RenderNode node, bool isLazy) {
  node._isLazyLoad = isLazy;
  for (var childNode in node._children) {
    setLazy(childNode, isLazy);
  }
}