com.facebook.litho.widget

Interface Binder<V extends ViewGroup>

All Known Implementing Classes:

RecyclerBinder, SectionBinderTarget

public interface Binder<V extends ViewGroup>

This binder class is used to asynchronously layout Components given a list of Component and attaching them to a ViewGroup through the bind(ViewGroup) method.

Method Summary

Modifier and Type	Method and Description
void	bind(V view) Bind this Binder to a View.
boolean	canMeasure() Only for horizontally scrolling layouts: return true if height is not known when measuring the view and the first item will be measured to determine the height.
void	detach() Detach items under the hood.
ComponentTree	getComponentAt(int position) Returns the component at the given position in the binder.
boolean	isWrapContent() Return true if wrap content is enabled, false otherwise.
void	measure(Size outSize, int widthSpec, int heightSpec, EventHandler<ReMeasureEvent> reMeasureEventHandler) Measure the content of this Binder.
void	mount(V view) Call this method before the View is mounted, i.e.
void	setCanMeasure(boolean canMeasure) Only for horizontally scrolling layouts: set to true if height is not known when measuring the view and the first item will need to be measured to determine the height of the view.
void	setSize(int width, int height) Set the width and height of the View that will be passed to the subsequent mount(ViewGroup), bind(ViewGroup) and unmount(ViewGroup) calls.
void	setViewportChangedListener(ViewportInfo.ViewportChanged viewportChangedListener) Bind a ViewportInfo.ViewportChanged listener to this Binder.
void	unbind(V view) Call this method when the view is unbound.
void	unmount(V view) Call this method when the view is unmounted.

Method Detail

setSize

void setSize(int width,
             int height)

Set the width and height of the View that will be passed to the subsequent mount(ViewGroup), bind(ViewGroup) and unmount(ViewGroup) calls. Can be called by any thread.

Parameters:

width - Usually the view width minus horizontal padding.

height - Usually the view height minus vertical padding.

measure

void measure(Size outSize,
             int widthSpec,
             int heightSpec,
             EventHandler<ReMeasureEvent> reMeasureEventHandler)

Measure the content of this Binder. Call this method from the Component's onMeasure.

getComponentAt

ComponentTree getComponentAt(int position)

Returns the component at the given position in the binder.

mount

void mount(V view)

Call this method before the View is mounted, i.e. within ComponentLifecycle.onMount(ComponentContext, Object))}

bind

void bind(V view)

Bind this Binder to a View. Remember to call ViewGroup#notifyDataSetChanged() when your Components are ready to be used.

unbind

void unbind(V view)

Call this method when the view is unbound.

Parameters:

view - the view being unbound.

unmount

void unmount(V view)

Call this method when the view is unmounted.

Parameters:

view - the view being unmounted.

setViewportChangedListener

void setViewportChangedListener(ViewportInfo.ViewportChanged viewportChangedListener)

Bind a ViewportInfo.ViewportChanged listener to this Binder. The listener will be notified of Viewport changes.

Parameters:

viewportChangedListener -

isWrapContent

boolean isWrapContent()

Return true if wrap content is enabled, false otherwise.

canMeasure

boolean canMeasure()

Only for horizontally scrolling layouts: return true if height is not known when measuring the view and the first item will be measured to determine the height.

setCanMeasure

void setCanMeasure(boolean canMeasure)

Only for horizontally scrolling layouts: set to true if height is not known when measuring the view and the first item will need to be measured to determine the height of the view.

detach

void detach()

Detach items under the hood.