1 /* 2 * Copyright (C) 2019 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 package com.android.launcher3.model; 17 18 import com.android.launcher3.LauncherSettings; 19 import com.android.launcher3.model.data.ItemInfo; 20 import com.android.launcher3.util.IntArray; 21 import com.android.launcher3.util.IntSet; 22 23 import java.util.ArrayList; 24 import java.util.Collections; 25 import java.util.List; 26 import java.util.Objects; 27 import java.util.stream.IntStream; 28 29 /** 30 * Utils class for {@link com.android.launcher3.LauncherModel}. 31 */ 32 public class ModelUtils { 33 34 /** 35 * Filters the set of items who are directly or indirectly (via another container) on the 36 * specified screen. 37 */ filterCurrentWorkspaceItems( final IntSet currentScreenIds, ArrayList<T> allWorkspaceItems, ArrayList<T> currentScreenItems, ArrayList<T> otherScreenItems)38 public static <T extends ItemInfo> void filterCurrentWorkspaceItems( 39 final IntSet currentScreenIds, 40 ArrayList<T> allWorkspaceItems, 41 ArrayList<T> currentScreenItems, 42 ArrayList<T> otherScreenItems) { 43 // Purge any null ItemInfos 44 allWorkspaceItems.removeIf(Objects::isNull); 45 // Order the set of items by their containers first, this allows use to walk through the 46 // list sequentially, build up a list of containers that are in the specified screen, 47 // as well as all items in those containers. 48 IntSet itemsOnScreen = new IntSet(); 49 Collections.sort(allWorkspaceItems, 50 (lhs, rhs) -> Integer.compare(lhs.container, rhs.container)); 51 for (T info : allWorkspaceItems) { 52 if (info.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) { 53 if (currentScreenIds.contains(info.screenId)) { 54 currentScreenItems.add(info); 55 itemsOnScreen.add(info.id); 56 } else { 57 otherScreenItems.add(info); 58 } 59 } else if (info.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) { 60 currentScreenItems.add(info); 61 itemsOnScreen.add(info.id); 62 } else { 63 if (itemsOnScreen.contains(info.container)) { 64 currentScreenItems.add(info); 65 itemsOnScreen.add(info.id); 66 } else { 67 otherScreenItems.add(info); 68 } 69 } 70 } 71 } 72 73 /** 74 * Iterates though current workspace items and returns available hotseat ranks for prediction. 75 */ getMissingHotseatRanks(List<ItemInfo> items, int len)76 public static IntArray getMissingHotseatRanks(List<ItemInfo> items, int len) { 77 IntSet seen = new IntSet(); 78 items.stream().filter( 79 info -> info.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) 80 .forEach(i -> seen.add(i.screenId)); 81 IntArray result = new IntArray(len); 82 IntStream.range(0, len).filter(i -> !seen.contains(i)).forEach(result::add); 83 return result; 84 } 85 } 86