1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.documentsui; 18 19 import static androidx.core.util.Preconditions.checkNotNull; 20 21 import androidx.recyclerview.selection.SelectionTracker; 22 import androidx.recyclerview.selection.SelectionTracker.SelectionObserver; 23 24 /** 25 * A controller that listens to selection changes and controls profile tabs behavior. 26 */ 27 public class ProfileTabsController extends SelectionObserver<String> { 28 29 private static final String TAG = "ProfileTabsController"; 30 31 private final SelectionTracker<String> mSelectionMgr; 32 private final ProfileTabsAddons mProfileTabsAddons; 33 ProfileTabsController( SelectionTracker<String> selectionMgr, ProfileTabsAddons profileTabsAddons)34 public ProfileTabsController( 35 SelectionTracker<String> selectionMgr, 36 ProfileTabsAddons profileTabsAddons) { 37 mSelectionMgr = checkNotNull(selectionMgr); 38 mProfileTabsAddons = checkNotNull(profileTabsAddons); 39 } 40 41 @Override onSelectionChanged()42 public void onSelectionChanged() { 43 onSelectionUpdated(); 44 } 45 46 @Override onSelectionRestored()47 public void onSelectionRestored() { 48 onSelectionUpdated(); 49 } 50 onSelectionUpdated()51 private void onSelectionUpdated() { 52 mProfileTabsAddons.setEnabled(mSelectionMgr.getSelection().isEmpty()); 53 } 54 } 55