content: /*
   * Copyright (C) 2018 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 com.google.androidstudio.motionlayoutexample.helpers;
  
  import android.animation.ObjectAnimator;
  import android.content.Context;
  import android.util.AttributeSet;
  import android.view.View;
  import android.view.animation.BounceInterpolator;
  
  import androidx.constraintlayout.widget.ConstraintHelper;
  import androidx.constraintlayout.widget.ConstraintLayout;
  
  public class ExampleFlyinBounceHelper extends ConstraintHelper {
      protected ConstraintLayout mContainer;
  
      public ExampleFlyinBounceHelper(Context context) {
          super(context);
      }
  
      public ExampleFlyinBounceHelper(Context context, AttributeSet attrs) {
          super(context, attrs);
      }
  
      public ExampleFlyinBounceHelper(Context context, AttributeSet attrs, int defStyleAttr) {
          super(context, attrs, defStyleAttr);
      }
  
      /**
       * @param container
       * @hide
       */
      @Override
      public void updatePreLayout(ConstraintLayout container) {
          if (mContainer!=container) {
              View[] views = getViews(container);
              for (int i = 0; i < mCount; i++) {
                  View view = views[i];
                  ObjectAnimator animator = ObjectAnimator.ofFloat(view, "translationX", - 2000, 0).setDuration(1000);
                  animator.setInterpolator(new BounceInterpolator());
                  animator.start();
              }
          }
          mContainer = container;
      }
  }
  