com.facebook.litho.annotations

Annotation Type FromBind

@Retention(value=SOURCE)
public @interface FromBind

FromBind is used to pass objects from the OnBind lifecycle methods of MountSpec to lifecycle methods called successively such as OnUnbind or OnUnmount. method, use FromBind with the same type and name to retrieve your previously set

To use it, simply declare a parameter of type com.facebook.litho.Output<> within the method annotated with OnBind. com.facebook.litho.Output<> accepts a generic type which should be the type of the object you want to pass around. Then, in a successive lifecycle method, use FromBind with the same type and name to retrieve your previously set object.

Example:

 @MountSpec
 public class MyComponentSpec {

   @OnCreateMountContent
   MyDrawable onCreateMountContent(Context context) {
     return new MyDrawable(c);
   }

   @OnMount
   void onMount(
       ComponentContext c,
       MyDrawable myDrawable,
        @Prop MyProp prop) {
     myDrawable.setMyProp(prop);
   }

   @OnBind
   void onBind(
       ComponentContext c,
       MyDrawable myDrawable,
       Output<MyFromBindObject> fromBindObject) {
     MyFromBindObject myFromBindObject = new MyFromBindObject();
     fromBindObject.set(myFromBindObject);
   }

   @OnUnbind
   void onUnbind(
       ComponentContext c,
       MyDrawable myDrawable,
        @FromBind MyFromBindObject fromBindObject) {
     fromBindObject.doSomething();
   }
 }