FairEmail/app/src/main/java/eu/faircode/email/FragmentIdentities.java

package eu.faircode.email;

/*
    This file is part of FairEmail.

    FairEmail is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    FairEmail is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018-2019 by Marcel Bokhorst (M66B)
*/

import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.constraintlayout.widget.Group;
import androidx.fragment.app.FragmentTransaction;
import androidx.lifecycle.Observer;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

import java.util.ArrayList;
import java.util.List;

public class FragmentIdentities extends FragmentBase {
    private RecyclerView rvIdentity;
    private ContentLoadingProgressBar pbWait;
    private Group grpReady;
    private FloatingActionButton fab;
    private ObjectAnimator animator;

    private AdapterIdentity adapter;

    @Override
    @Nullable
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        setSubtitle(R.string.title_list_identities);

        View view = inflater.inflate(R.layout.fragment_identities, container, false);

        // Get controls
        rvIdentity = view.findViewById(R.id.rvIdentity);
        pbWait = view.findViewById(R.id.pbWait);
        grpReady = view.findViewById(R.id.grpReady);
        fab = view.findViewById(R.id.fab);

        // Wire controls

        rvIdentity.setHasFixedSize(false);
        LinearLayoutManager llm = new LinearLayoutManager(getContext());
        rvIdentity.setLayoutManager(llm);

        DividerItemDecoration itemDecorator = new DividerItemDecoration(getContext(), llm.getOrientation());
        itemDecorator.setDrawable(getContext().getDrawable(R.drawable.divider));
        rvIdentity.addItemDecoration(itemDecorator);

        adapter = new AdapterIdentity(getContext(), getViewLifecycleOwner());
        rvIdentity.setAdapter(adapter);

        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentIdentity fragment = new FragmentIdentity();
                fragment.setArguments(new Bundle());
                FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
                fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("identity");
                fragmentTransaction.commit();
            }
        });

        animator = ObjectAnimator.ofFloat(fab, "alpha", 0.5f, 1.0f);
        animator.setDuration(500L);
        animator.setRepeatCount(ValueAnimator.INFINITE);
        animator.setRepeatMode(ValueAnimator.REVERSE);
        animator.addUpdateListener(new ObjectAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                fab.setAlpha((float) animation.getAnimatedValue());
            }
        });

        // Initialize
        grpReady.setVisibility(View.GONE);
        pbWait.setVisibility(View.VISIBLE);

        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        // Observe identities
        DB.getInstance(getContext()).identity().liveIdentities(false).observe(getViewLifecycleOwner(), new Observer<List<TupleIdentityEx>>() {
            @Override
            public void onChanged(@Nullable List<TupleIdentityEx> identities) {
                if (identities == null)
                    identities = new ArrayList<>();

                adapter.set(identities);

                pbWait.setVisibility(View.GONE);
                grpReady.setVisibility(View.VISIBLE);


                if (identities.size() == 0)
                    animator.start();
                else
                    animator.end();
            }
        });
    }
}