content: /*
   * Copyright 2015 Google Inc. All Rights Reserved.
   *
   * 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.samples.apps.ourstreets.fragment;
  
  import android.animation.Animator;
  import android.animation.AnimatorListenerAdapter;
  import android.animation.AnimatorSet;
  import android.animation.ObjectAnimator;
  import android.graphics.Point;
  import android.os.Bundle;
  import androidx.annotation.NonNull;
  import androidx.annotation.Nullable;
  import androidx.fragment.app.Fragment;
  import androidx.fragment.app.FragmentTransaction;
  import androidx.interpolator.view.animation.FastOutSlowInInterpolator;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.animation.Interpolator;
  import android.widget.FrameLayout;
  
  import com.google.android.gms.maps.OnStreetViewPanoramaReadyCallback;
  import com.google.android.gms.maps.StreetViewPanorama;
  import com.google.android.gms.maps.SupportStreetViewPanoramaFragment;
  import com.google.android.gms.maps.model.LatLng;
  import com.google.android.gms.maps.model.StreetViewPanoramaCamera;
  import com.google.samples.apps.ourstreets.R;
  import com.google.samples.apps.ourstreets.data.IntentKeys;
  import com.google.samples.apps.ourstreets.model.Detail;
  import com.google.samples.apps.ourstreets.view.ViewUtils;
  
  import java.util.concurrent.TimeUnit;
  
  /**
   * A {@link Fragment} that displays a StreetView.
   */
  public class StreetViewFragment extends Fragment implements BackPressAware {
  
      public static final String TAG = "StreetViewFragment";
  
      private static final String REVEAL_CENTER = "REVEAL_CENTER";
      private static final String REVEAL_WIDTH = "REVEAL_WIDTH";
      private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
  
      private SupportStreetViewPanoramaFragment mMapFragment;
      private boolean isRestored;
      private Detail mDetail;
      private Point mRevealCenter;
      private int mRevealWidth;
  
      /**
       * Use this factory method to create a new instance of
       * this fragment using the provided parameters.
       *
       * @param detail The StreetView to display.
       * @param revealCenter Center point of circular reveal start.
       * @param revealWidth Initial width as returned from {@link View#getWidth()}.
       * @return A new instance of fragment StreetViewFragment.
       */
      public static StreetViewFragment newInstance(@NonNull Detail detail,
                                                   @NonNull Point revealCenter,
                                                   int revealWidth) {
          StreetViewFragment fragment = new StreetViewFragment();
          Bundle args = new Bundle();
          args.putParcelable(IntentKeys.DETAIL, detail);
          args.putParcelable(REVEAL_CENTER, revealCenter);
          args.putInt(REVEAL_WIDTH, revealWidth);
          fragment.setArguments(args);
          return fragment;
      }
  
      public StreetViewFragment() {
          // no-op
      }
  
      /**
       * Change street view details without having to create a new fragment.
       *
       * @param detail The detail to display.
       */
      public void setDetail(Detail detail) {
          mDetail = detail;
          setUpStreetViewPanoramaIfNeeded(detail.getPosition());
      }
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          if (getArguments() != null) {
              mDetail = getArguments().getParcelable(IntentKeys.DETAIL);
          }
          mRevealCenter = getArguments().getParcelable(REVEAL_CENTER);
          mRevealWidth = getArguments().getInt(REVEAL_WIDTH);
          isRestored = savedInstanceState != null;
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle state) {
          ViewUtils.setStatusBarColor(getActivity(), R.color.status_bar_color);
          return inflater.inflate(R.layout.fragment_street_view, container, false);
      }
  
      @Override
      public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
          initMapFragment();
          FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
          transaction.add(R.id.container_street_view, mMapFragment)
                  .commit();
          if (savedInstanceState == null) {
              // Only animate when this fragment is not being recreated.
              revealPanorama();
          } else {
              view.setVisibility(View.VISIBLE);
          }
      }
  
      @Override
      public void onBackPressed() {
          if (isRestored) {
              getFragmentManager().popBackStack();
          } else {
              // Perform a circular conceal, then pop this fragment off the back stack.
              final FrameLayout view = ((FrameLayout) getView());
              //noinspection ConstantConditions
              Animator circularConceal = ViewUtils.createCircularConceal(mRevealCenter, mRevealWidth,
                      view, INTERPOLATOR);
              circularConceal.addListener(new AnimatorListenerAdapter() {
                  @Override
                  public void onAnimationEnd(Animator animation) {
                      view.setVisibility(View.GONE);
                      getFragmentManager().popBackStack();
                  }
              });
              circularConceal.start();
          }
      }
  
      private void initMapFragment() {
          mMapFragment = SupportStreetViewPanoramaFragment.newInstance();
          mMapFragment.getStreetViewPanoramaAsync(new OnStreetViewPanoramaReadyCallback() {
              @Override
              public void onStreetViewPanoramaReady(StreetViewPanorama streetViewPanorama) {
                  setUpStreetViewPanoramaIfNeeded(mDetail.getPosition());
              }
          });
      }
  
      private void setUpStreetViewPanoramaIfNeeded(final LatLng location) {
          mMapFragment.getStreetViewPanoramaAsync(new OnStreetViewPanoramaReadyCallback() {
              @Override
              public void onStreetViewPanoramaReady(StreetViewPanorama streetViewPanorama) {
                  if (streetViewPanorama != null) {
                      streetViewPanorama.setPosition(location);
                      streetViewPanorama.setUserNavigationEnabled(true);
                      streetViewPanorama.setPanningGesturesEnabled(true);
                      streetViewPanorama.setZoomGesturesEnabled(true);
  
                      StreetViewPanoramaCamera galleryOrientation = StreetViewPanoramaCamera.
                              builder(streetViewPanorama.getPanoramaCamera())
                              .bearing(mDetail.getBearing())
                              .tilt(mDetail.getTilt())
                              .build();
                      streetViewPanorama.animateTo(galleryOrientation, TimeUnit.SECONDS.toMillis(1));
                  }
              }
          });
      }
  
      /**
       * Reveals the contents of this fragment using a circular reveal animation.
       */
      private void revealPanorama() {
          //noinspection ConstantConditions
          getView().setVisibility(View.VISIBLE);
          //noinspection ConstantConditions
          Animator circularReveal = ViewUtils.createCircularReveal(mRevealCenter, mRevealWidth,
                  getView(), INTERPOLATOR);
          ObjectAnimator colorChange = ViewUtils.createColorChange(((FrameLayout) getView()),
                  R.color.foreground, android.R.color.transparent, INTERPOLATOR);
          AnimatorSet animatorSet = new AnimatorSet();
          animatorSet.play(circularReveal).with(colorChange);
          animatorSet.start();
      }
  }
  