OpenTracks/src/main/java/de/dennisguse/opentracks/MarkerDetailActivity.java

/*
 * Copyright 2009 Google Inc.
 *
 * 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 de.dennisguse.opentracks;

import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentStatePagerAdapter;
import androidx.viewpager.widget.ViewPager;

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

import de.dennisguse.opentracks.content.data.Marker;
import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
import de.dennisguse.opentracks.fragments.DeleteMarkerDialogFragment.DeleteMarkerCaller;
import de.dennisguse.opentracks.fragments.MarkerDetailFragment;

/**
 * An activity to display marker detail info.
 * <p>
 * Allows to swipe to the next and previous marker.
 *
 * @author Leif Hendrik Wilden
 */
public class MarkerDetailActivity extends AbstractActivity implements DeleteMarkerCaller {

    public static final String EXTRA_MARKER_ID = "marker_id";

    private static final String TAG = MarkerDetailActivity.class.getSimpleName();

    private List<Marker.Id> waypointIds;

    @Override
    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);

        Marker.Id waypointId = getIntent().getParcelableExtra(EXTRA_MARKER_ID);
        if (waypointId == null) {
            Log.d(TAG, "invalid marker id");
            finish();
            return;
        }

        ContentProviderUtils contentProviderUtils = new ContentProviderUtils(this);
        Marker waypoint = contentProviderUtils.getMarker(waypointId);

        waypointIds = new ArrayList<>();
        int markerIndex = -1;

        //TODO Load only waypointIds, not the whole waypoint
        try (Cursor cursor = contentProviderUtils.getMarkerCursor(waypoint.getTrackId(), null, -1)) {
            if (cursor != null && cursor.moveToFirst()) {
                for (int i = 0; i < cursor.getCount(); i++) {
                    Marker currentMarker = contentProviderUtils.createMarker(cursor);
                    waypointIds.add(currentMarker.getId());
                    if (waypointId.equals(currentMarker.getId())) {
                        markerIndex = waypointIds.size() - 1;
                    }

                    cursor.moveToNext();
                }
            }
        }

        final ViewPager viewPager = findViewById(R.id.maker_detail_activity_view_pager);
        final MarkerDetailPagerAdapter markerAdapter = new MarkerDetailPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(markerAdapter);
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            }

            @Override
            public void onPageSelected(int position) {
                setTitle(markerAdapter.getPageTitle(position));
            }

            @Override
            public void onPageScrollStateChanged(int state) {
            }
        });
        viewPager.setCurrentItem(markerIndex == -1 ? 0 : markerIndex);
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.marker_detail_activity;
    }

    @Override
    public void onDeleteMarkerDone() {
        runOnUiThread(this::finish);
    }

    /**
     * Marker detail pager adapter.
     *
     * @author Jimmy Shih
     */
    private class MarkerDetailPagerAdapter extends FragmentStatePagerAdapter {

        MarkerDetailPagerAdapter(FragmentManager fragmentManager) {
            super(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
        }

        @Override
        @NonNull
        public Fragment getItem(int position) {
            return MarkerDetailFragment.newInstance(waypointIds.get(position));
        }

        @Nullable
        @Override
        public CharSequence getPageTitle(int position) {
            return getString(R.string.marker_title, position + 1, getCount());
        }

        @Override
        public int getCount() {
            return waypointIds.size();
        }
    }
}