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 com.androidkun.xtablayout;
  
  import android.os.Handler;
  import android.os.Looper;
  import android.os.SystemClock;
  import android.view.animation.AccelerateDecelerateInterpolator;
  import android.view.animation.Interpolator;
  
  /**
   * A 'fake' ValueAnimator implementation which uses a Runnable.
   */
  class ValueAnimatorCompatImplEclairMr1 extends ValueAnimatorCompat.Impl {
  
      private static final int HANDLER_DELAY = 10;
      private static final int DEFAULT_DURATION = 200;
  
      private static final Handler sHandler = new Handler(Looper.getMainLooper());
  
      private long mStartTime;
      private boolean mIsRunning;
  
      private final int[] mIntValues = new int[2];
      private final float[] mFloatValues = new float[2];
  
      private int mDuration = DEFAULT_DURATION;
      private Interpolator mInterpolator;
      private AnimatorListenerProxy mListener;
      private AnimatorUpdateListenerProxy mUpdateListener;
  
      private float mAnimatedFraction;
  
      @Override
      public void start() {
          if (mIsRunning) {
              // If we're already running, ignore
              return;
          }
  
          if (mInterpolator == null) {
              mInterpolator = new AccelerateDecelerateInterpolator();
          }
  
          mStartTime = SystemClock.uptimeMillis();
          mIsRunning = true;
  
          if (mListener != null) {
              mListener.onAnimationStart();
          }
  
          sHandler.postDelayed(mRunnable, HANDLER_DELAY);
      }
  
      @Override
      public boolean isRunning() {
          return mIsRunning;
      }
  
      @Override
      public void setInterpolator(Interpolator interpolator) {
          mInterpolator = interpolator;
      }
  
      @Override
      public void setListener(AnimatorListenerProxy listener) {
          mListener = listener;
      }
  
      @Override
      public void setUpdateListener(AnimatorUpdateListenerProxy updateListener) {
          mUpdateListener = updateListener;
      }
  
      @Override
      public void setIntValues(int from, int to) {
          mIntValues[0] = from;
          mIntValues[1] = to;
      }
  
      @Override
      public int getAnimatedIntValue() {
          return AnimationUtils.lerp(mIntValues[0], mIntValues[1], getAnimatedFraction());
      }
  
      @Override
      public void setFloatValues(float from, float to) {
          mFloatValues[0] = from;
          mFloatValues[1] = to;
      }
  
      @Override
      public float getAnimatedFloatValue() {
          return AnimationUtils.lerp(mFloatValues[0], mFloatValues[1], getAnimatedFraction());
      }
  
      @Override
      public void setDuration(int duration) {
          mDuration = duration;
      }
  
      @Override
      public void cancel() {
          mIsRunning = false;
          sHandler.removeCallbacks(mRunnable);
  
          if (mListener != null) {
              mListener.onAnimationCancel();
          }
      }
  
      @Override
      public float getAnimatedFraction() {
          return mAnimatedFraction;
      }
  
      @Override
      public void end() {
          if (mIsRunning) {
              mIsRunning = false;
              sHandler.removeCallbacks(mRunnable);
  
              // Set our animated fraction to 1
              mAnimatedFraction = 1f;
  
              if (mUpdateListener != null) {
                  mUpdateListener.onAnimationUpdate();
              }
  
              if (mListener != null) {
                  mListener.onAnimationEnd();
              }
          }
      }
  
      @Override
      public long getDuration() {
          return mDuration;
      }
  
      private void update() {
          if (mIsRunning) {
              // Update the animated fraction
              final long elapsed = SystemClock.uptimeMillis() - mStartTime;
              final float linearFraction = elapsed / (float) mDuration;
              mAnimatedFraction = mInterpolator != null
                      ? mInterpolator.getInterpolation(linearFraction)
                      : linearFraction;
  
              // If we're running, dispatch tp the listener
              if (mUpdateListener != null) {
                  mUpdateListener.onAnimationUpdate();
              }
  
              // Check to see if we've passed the animation duration
              if (SystemClock.uptimeMillis() >= (mStartTime + mDuration)) {
                  mIsRunning = false;
  
                  if (mListener != null) {
                      mListener.onAnimationEnd();
                  }
              }
          }
  
          if (mIsRunning) {
              // If we're still running, post another delayed runnable
              sHandler.postDelayed(mRunnable, HANDLER_DELAY);
          }
      }
  
      private final Runnable mRunnable = new Runnable() {
          public void run() {
              update();
          }
      };
  }
  