content: /*
   * Copyright 2016, 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 <%= appPackage %>.addedittask;
  
  import android.databinding.Observable;
  import android.os.Bundle;
  import android.support.annotation.NonNull;
  import android.support.annotation.Nullable;
  import android.support.design.widget.FloatingActionButton;
  import android.support.v4.app.Fragment;
  import android.support.v7.app.ActionBar;
  import android.support.v7.app.AppCompatActivity;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  
  import <%= appPackage %>.R;
  import <%= appPackage %>.databinding.AddtaskFragBinding;
  import <%= appPackage %>.util.SnackbarUtils;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  /**
   * Main UI for the add task screen. Users can enter a task title and description.
   */
  public class AddEditTaskFragment extends Fragment {
  
      public static final String ARGUMENT_EDIT_TASK_ID = "EDIT_TASK_ID";
  
      private AddEditTaskViewModel mViewModel;
  
      private AddtaskFragBinding mViewDataBinding;
  
      private Observable.OnPropertyChangedCallback mSnackbarCallback;
  
      public static AddEditTaskFragment newInstance() {
          return new AddEditTaskFragment();
      }
  
      public AddEditTaskFragment() {
          // Required empty public constructor
      }
  
      @Override
      public void onResume() {
          super.onResume();
          if (getArguments() != null) {
              mViewModel.start(getArguments().getString(ARGUMENT_EDIT_TASK_ID));
          } else {
              mViewModel.start(null);
          }
      }
  
      public void setViewModel(@NonNull AddEditTaskViewModel viewModel) {
          mViewModel = checkNotNull(viewModel);
      }
  
      @Override
      public void onActivityCreated(Bundle savedInstanceState) {
          super.onActivityCreated(savedInstanceState);
  
          setupFab();
  
          setupSnackbar();
  
          setupActionBar();
      }
  
      @Nullable
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
                               Bundle savedInstanceState) {
          final View root = inflater.inflate(R.layout.addtask_frag, container, false);
          if (mViewDataBinding == null) {
              mViewDataBinding = AddtaskFragBinding.bind(root);
          }
  
          mViewDataBinding.setViewmodel(mViewModel);
  
          setHasOptionsMenu(true);
          setRetainInstance(false);
  
          return mViewDataBinding.getRoot();
      }
  
      @Override
      public void onDestroy() {
          if (mSnackbarCallback != null) {
              mViewModel.snackbarText.removeOnPropertyChangedCallback(mSnackbarCallback);
          }
          super.onDestroy();
      }
  
      private void setupSnackbar() {
          mSnackbarCallback = new Observable.OnPropertyChangedCallback() {
              @Override
              public void onPropertyChanged(Observable observable, int i) {
                  SnackbarUtils.showSnackbar(getView(), mViewModel.getSnackbarText());
              }
          };
          mViewModel.snackbarText.addOnPropertyChangedCallback(mSnackbarCallback);
      }
  
      private void setupFab() {
          FloatingActionButton fab =
                  (FloatingActionButton) getActivity().findViewById(R.id.fab_edit_task_done);
          fab.setImageResource(R.drawable.ic_done);
          fab.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  mViewModel.saveTask();
              }
          });
      }
  
      private void setupActionBar() {
          ActionBar actionBar = ((AppCompatActivity)getActivity()).getSupportActionBar();
          if (getArguments() != null) {
              actionBar.setTitle(R.string.edit_task);
          } else {
              actionBar.setTitle(R.string.add_task);
          }
      }
  }
  