content: /*
   * Copyright (C) 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.customtransition;
  
  import com.example.android.common.logger.Log;
  
  import android.content.Context;
  import android.os.Bundle;
  
  import androidx.annotation.NonNull;
  import androidx.fragment.app.Fragment;
  import android.transition.Scene;
  import android.transition.Transition;
  import android.transition.TransitionManager;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.FrameLayout;
  
  public class CustomTransitionFragment extends Fragment implements View.OnClickListener {
  
      private static final String STATE_CURRENT_SCENE = "current_scene";
  
      /** Tag for the logger */
      private static final String TAG = "CustomTransitionFragment";
  
      /** These are the Scenes we use. */
      private Scene[] mScenes;
  
      /** The current index for mScenes. */
      private int mCurrentScene;
  
      /** This is the custom Transition we use in this sample. */
      private Transition mTransition;
  
      public CustomTransitionFragment() {
      }
  
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
          return inflater.inflate(R.layout.fragment_custom_transition, container, false);
      }
  
      @Override
      public void onViewCreated(View view, Bundle savedInstanceState) {
          Context context = getActivity();
          FrameLayout container = (FrameLayout) view.findViewById(R.id.container);
          view.findViewById(R.id.show_next_scene).setOnClickListener(this);
          if (null != savedInstanceState) {
              mCurrentScene = savedInstanceState.getInt(STATE_CURRENT_SCENE);
          }
          // We set up the Scenes here.
          mScenes = new Scene[] {
                  Scene.getSceneForLayout(container, R.layout.scene1, context),
                  Scene.getSceneForLayout(container, R.layout.scene2, context),
                  Scene.getSceneForLayout(container, R.layout.scene3, context),
          };
          // This is the custom Transition.
          mTransition = new ChangeColor();
          // Show the initial Scene.
          TransitionManager.go(mScenes[mCurrentScene % mScenes.length]);
      }
  
      @Override
      public void onSaveInstanceState(@NonNull Bundle outState) {
          super.onSaveInstanceState(outState);
          outState.putInt(STATE_CURRENT_SCENE, mCurrentScene);
      }
  
      @Override
      public void onClick(View v) {
          if (v.getId() == R.id.show_next_scene) {
              mCurrentScene = (mCurrentScene + 1) % mScenes.length;
              Log.i(TAG, "Transitioning to scene #" + mCurrentScene);
              // Pass the custom Transition as second argument for TransitionManager.go
              TransitionManager.go(mScenes[mCurrentScene], mTransition);
          }
      }
  
  }
  