FromBoundsDefined
FromBoundsDefined is used to pass objects from the OnBoundsDefined lifecycle methods of MountSpec to lifecycle methods called successively such as OnMount or OnBind method, use FromBoundsDefined 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 OnBoundsDefined. 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 FromBoundsDefined with the same type and name to retrieve your previously set object.
This can be used in:
- OnMount
- OnBind
- OnUnbind
- OnUnmount
- OnPopulateAccessibilityNode
- OnPopulateExtraAccessibilityNode
- GetExtraAccessibilityNodeAt
- GetExtraAccessibilityNodesCount
Example:
@MountSpec
public class MyComponentSpec {
@OnCreateMountContent
MyDrawable onCreateMountContent(Context context) {
return new MyDrawable(c);
}
@OnBoundsDefined
void onBoundsDefined(
ComponentContext c,
ComponentLayout layout,
Output<MyFromBoundsDefinedObject> fromBoundsDefinedObject) {
MyFromBoundsDefinedObject myFromBoundsDefinedObject = new MyFromBoundsDefinedObject();
fromBoundsDefinedObject.set(myFromBoundsDefinedObject);
}
@OnMount
void onMount(
ComponentContext c,
MyDrawable myDrawable,
@FromBoundsDefined MyFromBoundsDefinedObject fromBoundsDefinedObject) {
fromBoundsDefinedObject.doSomething();
}
}
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