Add "delete mode" option on mode configuration page

Flag: android.app.modes_ui
Bug: 346575126
Test: manual
Change-Id: I0d085eb54ef5fa07f312bdddf0219855bf1c2ef4

src/com/android/settings/notification/modes/ZenModeFragment.java

@@ -16,10 +16,14 @@
 
 package com.android.settings.notification.modes;
 
+import android.app.AlertDialog;
 import android.app.Application;
 import android.app.AutomaticZenRule;
 import android.app.settings.SettingsEnums;
 import android.content.Context;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 
 import com.android.settings.R;
 import com.android.settingslib.applications.ApplicationsState;
@@ -30,6 +34,9 @@ import java.util.List;
 
 public class ZenModeFragment extends ZenModeFragmentBase {
 
+    // for mode deletion menu
+    private static final int DELETE_MODE = 1;
+
     @Override
     protected int getPreferenceScreenResId() {
         return R.xml.modes_rule_settings;
@@ -76,4 +83,43 @@ public class ZenModeFragment extends ZenModeFragmentBase {
         // TODO: b/332937635 - make this the correct metrics category
         return SettingsEnums.NOTIFICATION_ZEN_MODE_AUTOMATION;
     }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        menu.add(Menu.NONE, DELETE_MODE, Menu.NONE, R.string.zen_mode_menu_delete_mode);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    protected boolean onOptionsItemSelected(MenuItem item, ZenMode zenMode) {
+        switch (item.getItemId()) {
+            case DELETE_MODE:
+                new AlertDialog.Builder(mContext)
+                        .setTitle(mContext.getString(R.string.zen_mode_delete_mode_confirmation,
+                                zenMode.getRule().getName()))
+                        .setPositiveButton(R.string.zen_mode_schedule_delete,
+                                (dialog, which) -> {
+                                    // start finishing before calling removeMode() so that we don't
+                                    // try to update this activity with a nonexistent mode when the
+                                    // zen mode config is updated
+                                    finish();
+                                    mBackend.removeMode(zenMode);
+                                })
+                        .setNegativeButton(R.string.cancel, null)
+                        .show();
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
+    @Override
+    protected void updateZenModeState() {
+        // Because this fragment may be asked to finish by the delete menu but not be done doing
+        // so yet, ignore any attempts to update info in that case.
+        if (getActivity() != null && getActivity().isFinishing()) {
+            return;
+        }
+        super.updateZenModeState();
+    }
 }