com.facebook.litho

Interface ComponentTree.MeasureListener

Enclosing class:

ComponentTree

public static interface ComponentTree.MeasureListener

Method Summary

Modifier and Type	Method and Description
void	onSetRootAndSizeSpec(int layoutVersion, int width, int height, boolean stateUpdate) This callback gets called every time a ComponentTree commits a new layout computation.

Method Detail

onSetRootAndSizeSpec

void onSetRootAndSizeSpec(int layoutVersion,
                          int width,
                          int height,
                          boolean stateUpdate)

This callback gets called every time a ComponentTree commits a new layout computation. The call is executed on the same thread that computed the newly committed layout but outside the commit lock. This means that in practice the calls are not guaranteed to be ordered. A layout X committed before a layout Y could end up executing its MeasureListener's callback after the callback of layout Y. Clients that need guarantee over the ordering can rely on the layoutVersion parameter that is guaranteed to be increasing for successive commits (in the example layout X callback will receive a layoutVersion that is lower than the layoutVersion for layout Y)

Parameters:

layoutVersion - the layout version associated with the layout that triggered this callback

width - the resulting width from the committed layout computation

height - the resulting height from the committed layout computation

stateUpdate - whether this layout computation was triggered by a state update.