com.facebook.litho.sections.annotations

Annotation Type OnDataBound

@Retention(value=RUNTIME)
public @interface OnDataBound

The method annotated with this annotation will be called when the data corresponding to this Section props is now visible to the SectionTree.Target of the SectionTree . In the classic case where the Ui for the Section is represented by a RecyclerView, this means that by the time OnDataBound is called the RecyclerView has visibility over the data contained in this section.

For example:

   @GroupSectionSpec
   public class MyGroupSectionSpec {

     OnDataBound
     protected void onDataBound(
       SectionContext c,
       Service service, // If any
       @Prop  List<? extends Edge> edges,
       @Prop RecyclerCollectionEventsController recyclerController,
       @State(canUpdateLazily = true) boolean didScrollOnce) {
         if (!didScrollOnce) {
           recyclerController.requestScrollToPosition(10, true);
           MyGroupSectionSpec.lazyUpdateDidScrollOnce(c, true);
         } if (shouldTakeAction(edges)) {
           service.doSomething();
         }
     }
 }