FolderFragment.java

/*
 * Copyright (C) Winson Chiu
 *
 * 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 cw.kop.autobackground.images;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import cw.kop.autobackground.DividerItemDecoration;
import cw.kop.autobackground.R;
import cw.kop.autobackground.settings.AppSettings;
import cw.kop.autobackground.sources.SourceInfoFragment;

public class FolderFragment extends Fragment implements FolderCallback {

    public static final String USE_DIRECTORY = "useDirectory";
    public static final String SHOW_DIRECTORY_TEXT = "showDirectoryText";
    private static final int SLIDE_EXIT_TIME = 350;

    private Activity activity;

    private RecyclerView recyclerFiles;
    private RecyclerView.LayoutManager layoutManager;
    private TextView directoryText;
    private ImageView useDirectoryButton;
    private FolderEventListener listener;
    private RecyclerView.Adapter adapter;
    private String directory;
    private TextView emptyText;
    private RecyclerView.AdapterDataObserver adapterDataObserver;

    public FolderFragment() {
        // Required empty public constructor
    }

    public void setListener(FolderEventListener listener) {
        this.listener = listener;
    }

    public void setAdapter(RecyclerView.Adapter adapter) {
        this.adapter = adapter;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

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

        DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
        if (displayMetrics.heightPixels > displayMetrics.widthPixels) {
            layoutManager = new LinearLayoutManager(activity, LinearLayoutManager.VERTICAL,
                    false);
        }
        else {
            layoutManager = new GridLayoutManager(activity, 2, LinearLayoutManager.VERTICAL, false);
        }

        view.setBackgroundResource(AppSettings.getBackgroundColorResource());

        recyclerFiles = (RecyclerView) view.findViewById(R.id.recycler_files);
        recyclerFiles.setHasFixedSize(true);
        recyclerFiles.addItemDecoration(new DividerItemDecoration(activity, DividerItemDecoration.VERTICAL_LIST));
        recyclerFiles.setLayoutManager(layoutManager);

        emptyText = (TextView) view.findViewById(R.id.empty_text);

        directoryText = (TextView) view.findViewById(R.id.directory_text);
        directoryText.setTextColor(AppSettings.getColorFilterInt(activity));
        directoryText.setText(directory);
        directoryText.setSelected(true);

        int backgroundColor;

        if (AppSettings.getTheme().equals(AppSettings.APP_LIGHT_THEME)) {
            backgroundColor = getResources().getColor(R.color.LIGHT_THEME_BACKGROUND);
        }
        else {
            backgroundColor = getResources().getColor(R.color.DARK_THEME_BACKGROUND);
        }

        directoryText.setBackgroundColor(backgroundColor);
        recyclerFiles.setBackgroundColor(backgroundColor);

        useDirectoryButton = (ImageView) view.findViewById(R.id.use_directory_button);

        if (getArguments() != null) {
            if (getArguments().getBoolean(FolderFragment.SHOW_DIRECTORY_TEXT, true)) {
                directoryText.setVisibility(View.VISIBLE);
            }
            if (getArguments().getBoolean(FolderFragment.USE_DIRECTORY, false)) {
                useDirectoryButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        listener.onUseDirectoryClick();
                    }
                });
                useDirectoryButton.setOnLongClickListener(new View.OnLongClickListener() {
                    @Override
                    public boolean onLongClick(View v) {
                        Toast.makeText(activity, "Use this directory", Toast.LENGTH_LONG).show();
                        return true;
                    }
                });
                view.findViewById(R.id.floating_button).setVisibility(View.VISIBLE);
                useDirectoryButton.setVisibility(View.VISIBLE);
            }
        }

        adapterDataObserver = new RecyclerView.AdapterDataObserver() {
            @Override
            public void onChanged() {
                super.onChanged();
                emptyText.setVisibility(adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
            }
        };

        recyclerFiles.setAdapter(adapter);

        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
        adapter.registerAdapterDataObserver(adapterDataObserver);
        emptyText.setVisibility(adapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
    }

    @Override
    public void onPause() {
        adapter.unregisterAdapterDataObserver(adapterDataObserver);
        super.onPause();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        this.activity = activity;
        listener.setActivity(activity);
    }

    @Override
    public void onDetach() {
        super.onDetach();
        activity = null;
    }

    public void onBackPressed() {
        if (listener == null) {
            getFragmentManager().popBackStack();
        }

        if (listener.onBackPressed()) {

            final int screenHeight = getResources().getDisplayMetrics().heightPixels;
            final View fragmentView = getView();

            if (fragmentView != null) {
                final float viewStartY = getView().getY();

                Animation animation = new Animation() {
                    @Override
                    protected void applyTransformation(float interpolatedTime, Transformation t) {
                        fragmentView.setY((screenHeight - viewStartY) * interpolatedTime + viewStartY);
                    }

                    @Override
                    public boolean willChangeBounds() {
                        return true;
                    }
                };

                animation.setAnimationListener(new Animation.AnimationListener() {
                    @Override
                    public void onAnimationStart(Animation animation) {

                    }

                    @Override
                    public void onAnimationEnd(Animation animation) {
                        getFragmentManager().popBackStack();
                    }

                    @Override
                    public void onAnimationRepeat(Animation animation) {

                    }
                });

                animation.setDuration(SLIDE_EXIT_TIME);
                getView().startAnimation(animation);
            }
            else {
                getFragmentManager().popBackStack();
            }
        }
    }

    public void setStartingDirectoryText(String text) {
        directory = text;
    }

    public void setDirectoryText(String text) {
        directory = text;
        directoryText.setText(text);
    }

    @Override
    public float getItemWidth() {
        if (layoutManager instanceof GridLayoutManager) {
            return recyclerFiles.getWidth() / ((GridLayoutManager) layoutManager).getSpanCount();
        }
        return recyclerFiles.getWidth();
    }

    @Override
    public void onItemClick(int position) {
        listener.onItemClick(position);
    }

    public interface FolderEventListener {

        void onUseDirectoryClick();
        void onItemClick(int positionInList);
        boolean onBackPressed();
        void setActivity(Activity activity);
    }

}