147 lines
3.9 KiB
Java
147 lines
3.9 KiB
Java
package us.shandian.giga.ui.common;
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import android.content.Context;
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import android.content.Intent;
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import android.graphics.Color;
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import android.os.Handler;
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import android.view.View;
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import com.google.android.material.snackbar.Snackbar;
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import org.schabi.newpipe.R;
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import java.util.ArrayList;
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import us.shandian.giga.get.FinishedMission;
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import us.shandian.giga.get.Mission;
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import us.shandian.giga.service.DownloadManager;
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import us.shandian.giga.service.DownloadManager.MissionIterator;
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import us.shandian.giga.ui.adapter.MissionAdapter;
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public class Deleter {
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private static final int TIMEOUT = 5000;// ms
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private static final int DELAY = 350;// ms
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private static final int DELAY_RESUME = 400;// ms
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private Snackbar snackbar;
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private ArrayList<Mission> items;
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private boolean running = true;
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private final Context mContext;
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private final MissionAdapter mAdapter;
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private final DownloadManager mDownloadManager;
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private final MissionIterator mIterator;
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private final Handler mHandler;
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private final View mView;
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private final Runnable rShow;
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private final Runnable rNext;
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private final Runnable rCommit;
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public Deleter(View v, Context c, MissionAdapter a, DownloadManager d, MissionIterator i, Handler h) {
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mView = v;
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mContext = c;
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mAdapter = a;
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mDownloadManager = d;
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mIterator = i;
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mHandler = h;
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// use variables to know the reference of the lambdas
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rShow = this::show;
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rNext = this::next;
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rCommit = this::commit;
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items = new ArrayList<>(2);
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}
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public void append(Mission item) {
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/* If a mission is removed from the list while the Snackbar for a previously
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* removed item is still showing, commit the action for the previous item
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* immediately. This prevents Snackbars from stacking up in reverse order.
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*/
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mHandler.removeCallbacks(rCommit);
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commit();
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mIterator.hide(item);
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items.add(0, item);
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show();
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}
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private void forget() {
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mIterator.unHide(items.remove(0));
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mAdapter.applyChanges();
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show();
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}
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private void show() {
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if (items.size() < 1) return;
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pause();
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running = true;
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mHandler.postDelayed(rNext, DELAY);
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}
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private void next() {
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if (items.size() < 1) return;
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String msg = mContext.getString(R.string.file_deleted).concat(":\n").concat(items.get(0).storage.getName());
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snackbar = Snackbar.make(mView, msg, Snackbar.LENGTH_INDEFINITE);
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snackbar.setAction(R.string.undo, s -> forget());
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snackbar.setActionTextColor(Color.YELLOW);
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snackbar.show();
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mHandler.postDelayed(rCommit, TIMEOUT);
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}
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private void commit() {
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if (items.size() < 1) return;
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while (items.size() > 0) {
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Mission mission = items.remove(0);
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if (mission.deleted) continue;
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mIterator.unHide(mission);
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mDownloadManager.deleteMission(mission);
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if (mission instanceof FinishedMission) {
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mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, mission.storage.getUri()));
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}
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break;
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}
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if (items.size() < 1) {
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pause();
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return;
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}
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show();
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}
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public void pause() {
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running = false;
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mHandler.removeCallbacks(rNext);
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mHandler.removeCallbacks(rShow);
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mHandler.removeCallbacks(rCommit);
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if (snackbar != null) snackbar.dismiss();
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}
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public void resume() {
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if (running) return;
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mHandler.postDelayed(rShow, DELAY_RESUME);
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}
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public void dispose() {
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if (items.size() < 1) return;
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pause();
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for (Mission mission : items) mDownloadManager.deleteMission(mission);
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items = null;
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}
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}
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