1 /* 2 * Copyright (C) 2017 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.documentsui.selection; 17 18 import static android.support.v4.util.Preconditions.checkArgument; 19 20 import android.support.annotation.Nullable; 21 import android.view.MotionEvent; 22 23 import com.android.documentsui.selection.ItemDetailsLookup.ItemDetails; 24 25 /** 26 * BandPredicate that consults ItemDetails, premitting band selection to start 27 * when the event is not in the drag region of the item. 28 */ 29 public final class DefaultBandPredicate extends BandPredicate { 30 31 private final ItemDetailsLookup mDetailsLookup; 32 DefaultBandPredicate(ItemDetailsLookup detailsLookup)33 public DefaultBandPredicate(ItemDetailsLookup detailsLookup) { 34 checkArgument(detailsLookup != null); 35 36 mDetailsLookup = detailsLookup; 37 } 38 39 @Override canInitiate(MotionEvent e)40 public boolean canInitiate(MotionEvent e) { 41 @Nullable ItemDetails details = mDetailsLookup.getItemDetails(e); 42 return (details != null) 43 ? !details.inDragRegion(e) 44 : true; 45 } 46 } 47