content: /*
   * Copyright (C) 2015 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.design.widget;
  
  import android.view.animation.Animation;
  import android.view.animation.DecelerateInterpolator;
  import android.view.animation.Interpolator;
  import android.view.animation.LinearInterpolator;
  import androidx.interpolator.view.animation.FastOutLinearInInterpolator;
  import androidx.interpolator.view.animation.FastOutSlowInInterpolator;
  import androidx.interpolator.view.animation.LinearOutSlowInInterpolator;
  
  class AnimationUtils {
  
      static final Interpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
      static final Interpolator FAST_OUT_SLOW_IN_INTERPOLATOR = new FastOutSlowInInterpolator();
      static final Interpolator FAST_OUT_LINEAR_IN_INTERPOLATOR = new FastOutLinearInInterpolator();
      static final Interpolator LINEAR_OUT_SLOW_IN_INTERPOLATOR = new LinearOutSlowInInterpolator();
      static final Interpolator DECELERATE_INTERPOLATOR = new DecelerateInterpolator();
  
      /**
       * Linear interpolation between {@code startValue} and {@code endValue} by {@code fraction}.
       */
      static float lerp(float startValue, float endValue, float fraction) {
          return startValue + (fraction * (endValue - startValue));
      }
  
      static int lerp(int startValue, int endValue, float fraction) {
          return startValue + Math.round(fraction * (endValue - startValue));
      }
  
      static class AnimationListenerAdapter implements Animation.AnimationListener {
          @Override
          public void onAnimationStart(Animation animation) {
          }
  
          @Override
          public void onAnimationEnd(Animation animation) {
          }
  
          @Override
          public void onAnimationRepeat(Animation animation) {
          }
      }
  
  }
  