content: /*
   * Copyright 2014 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.example.android.revealeffectbasic;
  
  import android.animation.Animator;
  import android.os.Bundle;
  import androidx.annotation.Nullable;
  import androidx.fragment.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewAnimationUtils;
  import android.view.ViewGroup;
  import android.view.animation.AccelerateDecelerateInterpolator;
  
  import com.example.android.common.logger.Log;
  
  /**
   * This sample shows a view that is revealed when a button is clicked.
   */
  public class RevealEffectBasicFragment extends Fragment {
  
      private final static String TAG = "RevealEffectBasicFragment";
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setHasOptionsMenu(true);
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          return inflater.inflate(R.layout.reveal_effect_basic, container, false);
      }
  
      @Override
      public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
          final View shape = view.findViewById(R.id.circle);
          final View button = view.findViewById(R.id.button);
          // Set a listener to reveal the view when clicked.
          button.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View view) {
                  // Create a reveal {@link Animator} that starts clipping the view from
                  // the top left corner until the whole view is covered.
                  Animator circularReveal = ViewAnimationUtils.createCircularReveal(
                          shape,
                          0,
                          0,
                          0,
                          (float) Math.hypot(shape.getWidth(), shape.getHeight()));
                  circularReveal.setInterpolator(new AccelerateDecelerateInterpolator());
  
                  // Finally start the animation
                  circularReveal.start();
  
                  Log.d(TAG, "Starting Reveal animation");
              }
          });
          super.onViewCreated(view, savedInstanceState);
      }
  }