| /* |
| * Copyright 2017 The Android Open Source Project |
| * |
| * 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 androidx.recyclerview.selection; |
| |
| import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; |
| |
| import android.support.annotation.RestrictTo; |
| |
| import androidx.recyclerview.selection.SelectionHelper.SelectionPredicate; |
| |
| /** |
| * Utility class for creating SelectionPredicate instances. |
| * |
| * @hide |
| */ |
| @RestrictTo(LIBRARY_GROUP) |
| public final class SelectionPredicates { |
| |
| private SelectionPredicates() {} |
| |
| /** |
| * Returns a selection predicate that allows multiples items to be selected, without |
| * any restrictions on which items can be selected. |
| * @param <K> |
| * @return |
| */ |
| public static <K> SelectionPredicate<K> selectAnything() { |
| return new SelectionPredicate<K>() { |
| @Override |
| public boolean canSetStateForKey(K key, boolean nextState) { |
| return true; |
| } |
| |
| @Override |
| public boolean canSetStateAtPosition(int position, boolean nextState) { |
| return true; |
| } |
| |
| @Override |
| public boolean canSelectMultiple() { |
| return true; |
| } |
| }; |
| } |
| |
| /** |
| * Returns a selection predicate that allows a single item to be selected, without |
| * any restrictions on which item can be selected. |
| * @param <K> |
| * @return |
| */ |
| public static <K> SelectionPredicate<K> selectSingleAnything() { |
| return new SelectionPredicate<K>() { |
| @Override |
| public boolean canSetStateForKey(K key, boolean nextState) { |
| return true; |
| } |
| |
| @Override |
| public boolean canSetStateAtPosition(int position, boolean nextState) { |
| return true; |
| } |
| |
| @Override |
| public boolean canSelectMultiple() { |
| return false; |
| } |
| }; |
| } |
| } |