chinwag-android/app/src/main/java/com/keylesspalace/tusky/ViewMediaFragment.java

/* Copyright 2017 Andrew Dawson
 *
 * This file is part of Tusky.
 *
 * Tusky is free software: you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * Tusky 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 Lesser
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with Tusky. If
 * not, see <http://www.gnu.org/licenses/>. */

package com.keylesspalace.tusky;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;

import com.squareup.picasso.Callback;
import com.squareup.picasso.Picasso;

import butterknife.BindView;
import butterknife.ButterKnife;
import uk.co.senab.photoview.PhotoView;
import uk.co.senab.photoview.PhotoViewAttacher;

public class ViewMediaFragment extends DialogFragment {

    private PhotoViewAttacher attacher;

    @BindView(R.id.view_media_image) PhotoView photoView;

    public static ViewMediaFragment newInstance(String url) {
        Bundle arguments = new Bundle();
        ViewMediaFragment fragment = new ViewMediaFragment();
        arguments.putString("url", url);
        fragment.setArguments(arguments);
        return fragment;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setStyle(DialogFragment.STYLE_NORMAL, R.style.Dialog_FullScreen);
    }

    @Override
    public void onResume() {
        ViewGroup.LayoutParams params = getDialog().getWindow().getAttributes();
        params.width = WindowManager.LayoutParams.MATCH_PARENT;
        params.height = WindowManager.LayoutParams.MATCH_PARENT;
        getDialog().getWindow().setAttributes((android.view.WindowManager.LayoutParams) params);
        super.onResume();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_view_media, container, false);
        ButterKnife.bind(this, rootView);

        Bundle arguments = getArguments();
        String url = arguments.getString("url");

        attacher = new PhotoViewAttacher(photoView);

        // Clicking outside the photo closes the viewer.
        attacher.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() {
            @Override
            public void onPhotoTap(View view, float x, float y) {

            }

            @Override
            public void onOutsidePhotoTap() {
                dismiss();
            }
        });

        /* A vertical swipe motion also closes the viewer. This is especially useful when the photo
         * mostly fills the screen so clicking outside is difficult. */
        attacher.setOnSingleFlingListener(new PhotoViewAttacher.OnSingleFlingListener() {
            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                    float velocityY) {
                if (Math.abs(velocityY) > Math.abs(velocityX)) {
                    dismiss();
                    return true;
                }
                return false;
            }
        });

        Picasso.with(getContext())
                .load(url)
                .into(photoView, new Callback() {
                    @Override
                    public void onSuccess() {
                        attacher.update();
                    }

                    @Override
                    public void onError() {

                    }
                });

        return rootView;
    }

    @Override
    public void onDestroyView() {
        attacher.cleanup();
        super.onDestroyView();
    }
}