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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.tv.common.ui.setup.animation;
     17 
     18 import android.animation.Animator;
     19 import android.animation.AnimatorListenerAdapter;
     20 import android.animation.ObjectAnimator;
     21 import android.animation.TimeInterpolator;
     22 import android.graphics.Path;
     23 import android.support.v17.leanback.R;
     24 import android.transition.Transition;
     25 import android.transition.TransitionValues;
     26 import android.view.View;
     27 
     28 /**
     29  * This class is used by Slide and Explode to create an animator that goes from the start position
     30  * to the end position. It takes into account the canceled position so that it will not blink out or
     31  * shift suddenly when the transition is interrupted. The original class is
     32  * android.support.v17.leanback.transition.TranslationAnimationCreator which is hidden.
     33  */
     34 // Copied from android.support.v17.leanback.transition.TransltaionAnimationCreator
     35 class TranslationAnimationCreator {
     36     /**
     37      * Creates an animator that can be used for x and/or y translations. When interrupted, it sets a
     38      * tag to keep track of the position so that it may be continued from position.
     39      *
     40      * @param view The view being moved. This may be in the overlay for onDisappear.
     41      * @param values The values containing the view in the view hierarchy.
     42      * @param viewPosX The x screen coordinate of view
     43      * @param startX The start translation x of view
     44      * @param endX The end translation x of view
     45      * @param interpolator The interpolator to use with this animator.
     46      * @return An animator that moves from (startX, startY) to (endX, endY) unless there was a
     47      *     previous interruption, in which case it moves from the current position to (endX, endY).
     48      */
     49     static Animator createAnimation(
     50             View view,
     51             TransitionValues values,
     52             int viewPosX,
     53             float startX,
     54             float endX,
     55             TimeInterpolator interpolator,
     56             Transition transition) {
     57         float terminalX = view.getTranslationX();
     58         Integer startPosition = (Integer) values.view.getTag(R.id.transitionPosition);
     59         if (startPosition != null) {
     60             startX = startPosition - viewPosX + terminalX;
     61         }
     62         // Initial position is at translation startX, startY, so position is offset by that
     63         // amount
     64         int startPosX = viewPosX + Math.round(startX - terminalX);
     65 
     66         view.setTranslationX(startX);
     67         if (startX == endX) {
     68             return null;
     69         }
     70         Path path = new Path();
     71         path.moveTo(startX, 0);
     72         path.lineTo(endX, 0);
     73         ObjectAnimator anim =
     74                 ObjectAnimator.ofFloat(view, View.TRANSLATION_X, View.TRANSLATION_Y, path);
     75 
     76         TransitionPositionListener listener =
     77                 new TransitionPositionListener(view, values.view, startPosX, terminalX);
     78         transition.addListener(listener);
     79         anim.addListener(listener);
     80         anim.addPauseListener(listener);
     81         anim.setInterpolator(interpolator);
     82         return anim;
     83     }
     84 
     85     private static class TransitionPositionListener extends AnimatorListenerAdapter
     86             implements Transition.TransitionListener {
     87 
     88         private final View mViewInHierarchy;
     89         private final View mMovingView;
     90         private final int mStartX;
     91         private Integer mTransitionPosition;
     92         private float mPausedX;
     93         private final float mTerminalX;
     94 
     95         private TransitionPositionListener(
     96                 View movingView, View viewInHierarchy, int startX, float terminalX) {
     97             mMovingView = movingView;
     98             mViewInHierarchy = viewInHierarchy;
     99             mStartX = startX - Math.round(mMovingView.getTranslationX());
    100             mTerminalX = terminalX;
    101             mTransitionPosition = (Integer) mViewInHierarchy.getTag(R.id.transitionPosition);
    102             if (mTransitionPosition != null) {
    103                 mViewInHierarchy.setTag(R.id.transitionPosition, null);
    104             }
    105         }
    106 
    107         @Override
    108         public void onAnimationCancel(Animator animation) {
    109             mTransitionPosition = Math.round(mStartX + mMovingView.getTranslationX());
    110             mViewInHierarchy.setTag(R.id.transitionPosition, mTransitionPosition);
    111         }
    112 
    113         @Override
    114         public void onAnimationEnd(Animator animator) {}
    115 
    116         @Override
    117         public void onAnimationPause(Animator animator) {
    118             mPausedX = mMovingView.getTranslationX();
    119             mMovingView.setTranslationX(mTerminalX);
    120         }
    121 
    122         @Override
    123         public void onAnimationResume(Animator animator) {
    124             mMovingView.setTranslationX(mPausedX);
    125         }
    126 
    127         @Override
    128         public void onTransitionStart(Transition transition) {}
    129 
    130         @Override
    131         public void onTransitionEnd(Transition transition) {
    132             mMovingView.setTranslationX(mTerminalX);
    133         }
    134 
    135         @Override
    136         public void onTransitionCancel(Transition transition) {}
    137 
    138         @Override
    139         public void onTransitionPause(Transition transition) {}
    140 
    141         @Override
    142         public void onTransitionResume(Transition transition) {}
    143     }
    144 }
    145