| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.support.v17.leanback.transition; |
| |
| import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; |
| |
| import android.animation.Animator; |
| import android.animation.ValueAnimator; |
| import android.content.Context; |
| import android.support.annotation.RequiresApi; |
| import android.support.annotation.RestrictTo; |
| import android.support.v17.leanback.R; |
| import android.support.v17.leanback.widget.Parallax; |
| import android.transition.TransitionValues; |
| import android.transition.Visibility; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.animation.Interpolator; |
| import android.view.animation.LinearInterpolator; |
| |
| /** |
| * A slide transition changes TRANSLATION attribute of view which is not exposed by any event. |
| * In order to run a parallax effect with Slide transition, ParallaxTransition is running on the |
| * side, calling ParallaxSource.updateValues() on every frame. User should make sure slide |
| * and ParallaxTransition are using same duration and startDelay. |
| * |
| * @hide |
| */ |
| @RequiresApi(21) |
| @RestrictTo(LIBRARY_GROUP) |
| public class ParallaxTransition extends Visibility { |
| |
| static Interpolator sInterpolator = new LinearInterpolator(); |
| |
| public ParallaxTransition() { |
| } |
| |
| public ParallaxTransition(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| } |
| |
| Animator createAnimator(View view) { |
| final Parallax source = (Parallax) view.getTag(R.id.lb_parallax_source); |
| if (source == null) { |
| return null; |
| } |
| ValueAnimator animator = ValueAnimator.ofFloat(0, 1); |
| animator.setInterpolator(sInterpolator); |
| animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { |
| @Override |
| public void onAnimationUpdate(ValueAnimator animation) { |
| source.updateValues(); |
| } |
| }); |
| return animator; |
| } |
| |
| @Override |
| public Animator onAppear(ViewGroup sceneRoot, View view, |
| TransitionValues startValues, TransitionValues endValues) { |
| if (endValues == null) { |
| return null; |
| } |
| return createAnimator(view); |
| } |
| |
| @Override |
| public Animator onDisappear(ViewGroup sceneRoot, View view, |
| TransitionValues startValues, TransitionValues endValues) { |
| if (startValues == null) { |
| return null; |
| } |
| return createAnimator(view); |
| } |
| } |