Threema-Android-mirror/app/src/main/java/ch/threema/app/mediaattacher/ImagePreviewPagerAdapter.java

/*  _____ _
 * |_   _| |_  _ _ ___ ___ _ __  __ _
 *   | | | ' \| '_/ -_) -_) '  \/ _` |_
 *   |_| |_||_|_| \___\___|_|_|_\__,_(_)
 *
 * Threema for Android
 * Copyright (c) 2021-2024 Threema GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

package ch.threema.app.mediaattacher;

import android.os.Bundle;
import android.widget.Toast;

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

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.OptIn;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.lifecycle.ViewModelProvider;
import androidx.media3.common.util.UnstableApi;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import ch.threema.app.ThreemaApplication;
import ch.threema.app.activities.MediaViewerActivity;
import ch.threema.app.ui.MediaItem;

public class ImagePreviewPagerAdapter extends FragmentStateAdapter {
	private final MediaAttachViewModel mediaAttachViewModel;
	private List<MediaAttachItem> mediaAttachItems = new ArrayList<>();

	public ImagePreviewPagerAdapter(FragmentActivity mediaSelectionBaseActivity) {
		super(mediaSelectionBaseActivity);

		this.mediaAttachViewModel = new ViewModelProvider(mediaSelectionBaseActivity).get(MediaAttachViewModel.class);
	}

	@NonNull
	@Override
	public Fragment createFragment(int position) {
		MediaAttachItem mediaAttachItem = getItem(position);
		if (mediaAttachItem != null) {
			int mimeType = mediaAttachItem.getType();
			Bundle args = new Bundle();
			args.putBoolean(MediaViewerActivity.EXTRA_ID_IMMEDIATE_PLAY, true);

			PreviewFragment fragment = null;
			if (mimeType == MediaItem.TYPE_IMAGE || mimeType == MediaItem.TYPE_GIF || mimeType == MediaItem.TYPE_IMAGE_ANIMATED) {
				fragment = new ImagePreviewFragment(mediaAttachItem, mediaAttachViewModel);
			} else if (mimeType == MediaItem.TYPE_VIDEO) {
				fragment = new VideoPreviewFragment(mediaAttachItem, mediaAttachViewModel);
			}

			if (fragment != null) {
				fragment.setArguments(args);
				return fragment;
			} else {
				Toast.makeText(ThreemaApplication.getAppContext(), "Unrecognized Preview Format", Toast.LENGTH_SHORT).show();
			}
		}
		return new DummyPreviewFragment(mediaAttachItem, mediaAttachViewModel);
	}

	public void setMediaItems(List<MediaAttachItem> items) {
		mediaAttachItems = items;
		notifyDataSetChanged();
	}

	@Override
	public int getItemCount() {
		return mediaAttachItems.size();
	}

	@Nullable
	public MediaAttachItem getItem(int position) {
		if (position < mediaAttachItems.size() && position >= 0) {
			return mediaAttachItems.get(position);
		}
		return null;
	}
}