com.bumptech.glide.request.transition

Class DrawableCrossFadeTransition

java.lang.Object

com.bumptech.glide.request.transition.DrawableCrossFadeTransition

All Implemented Interfaces:

Transition<Drawable>

public class DrawableCrossFadeTransition
extends Object
implements Transition<Drawable>

A cross fade Transition for Drawables that uses an TransitionDrawable to transition from an existing drawable already visible on the target to a new drawable. If no existing drawable exists, this class can instead fall back to a default animation that doesn't rely on TransitionDrawable.

Nested Class Summary

Nested classes/interfaces inherited from interface com.bumptech.glide.request.transition.Transition

Transition.ViewAdapter

Constructor Summary

Constructors

Constructor and Description
DrawableCrossFadeTransition(Transition<Drawable> defaultAnimation, int duration, boolean isCrossFadeEnabled) Constructor that takes a default animation and a duration in milliseconds that the cross fade animation should last.

Method Summary

Modifier and Type	Method and Description
boolean	transition(Drawable current, Transition.ViewAdapter adapter) Animates from the previous drawable to the current drawable in one of two ways.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DrawableCrossFadeTransition

public DrawableCrossFadeTransition(Transition<Drawable> defaultAnimation,
                                   int duration,
                                   boolean isCrossFadeEnabled)

Constructor that takes a default animation and a duration in milliseconds that the cross fade animation should last.

Parameters:

defaultAnimation - The Transition to use if there is no previous Drawable (either a placeholder or previous resource) to transition from.

duration - The duration that the cross fade animation should run if there is something to cross fade from when a new Drawable is put.

isCrossFadeEnabled - If true, animates the previous resource's alpha to 0 while animating the new resource's alpha to 100. Otherwise, only animates the new resource's alpha to 100 while leaving the previous resource's alpha at 100. See TransitionDrawable.setCrossFadeEnabled(boolean).

Method Detail

transition

public boolean transition(Drawable current,
                          Transition.ViewAdapter adapter)

Animates from the previous drawable to the current drawable in one of two ways.

1. Using the default animation provided in the constructor if the previous drawable is null
2. Using the cross fade animation with the duration provided in the constructor if the previous drawable is non null

Specified by:

transition in interface Transition<Drawable>

Parameters:

current - The new resource that will be displayed in the view.

adapter - The Transition.ViewAdapter wrapping a view that can at least return an View from Transition.ViewAdapter.getView().

Returns:

True if in the process of running the transition, the new resource was put on the view, false if the caller needs to manually put the current resource on the view.