onRenderedChildren property
/ The callback that will be called after children widgets has been built.
If no return value is provided, the default behavior is to wrap the children
using WidgetFactory.buildColumnPlaceholder before continue with
BuildOp.onRenderBlock
callbacks.
If there are more than one BuildOps with this callback, the first one returning a non-null value will win.
Implementation
final OnRenderedChildren? onRenderedChildren;