1 /* 2 * Copyright (C) 2024 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.launcher3.widget.picker; 18 19 import static com.android.launcher3.widget.picker.WidgetsListAdapter.VIEW_TYPE_WIDGETS_LIST; 20 21 import androidx.recyclerview.widget.DefaultItemAnimator; 22 import androidx.recyclerview.widget.RecyclerView; 23 24 public class WidgetsListItemAnimator extends DefaultItemAnimator { 25 public static final int CHANGE_DURATION_MS = 90; 26 public static final int MOVE_DURATION_MS = 90; 27 public static final int ADD_DURATION_MS = 120; 28 WidgetsListItemAnimator()29 public WidgetsListItemAnimator() { 30 super(); 31 32 // Disable change animations because it disrupts the item focus upon adapter item 33 // change. 34 setSupportsChangeAnimations(false); 35 // Make the moves a bit faster, so that the amount of time for which user sees the 36 // bottom-sheet background before "add" animation starts is less making it smoother. 37 setChangeDuration(CHANGE_DURATION_MS); 38 setMoveDuration(MOVE_DURATION_MS); 39 setAddDuration(ADD_DURATION_MS); 40 } 41 @Override animateChange(RecyclerView.ViewHolder oldHolder, RecyclerView.ViewHolder newHolder, int fromLeft, int fromTop, int toLeft, int toTop)42 public boolean animateChange(RecyclerView.ViewHolder oldHolder, 43 RecyclerView.ViewHolder newHolder, int fromLeft, int fromTop, int toLeft, 44 int toTop) { 45 // As we expand an item, the content / widgets list that appears (with add 46 // event) also gets change events as its previews load asynchronously. The 47 // super implementation of animateChange cancels the animations on it - breaking 48 // the "add animation". Instead, here, we skip "change" animation for content 49 // list - because we want it to either appear or disappear. And, the previews 50 // themselves have their own animation when loaded, so, we don't need change 51 // animations for them anyway. Below, we do-nothing. 52 if (oldHolder.getItemViewType() == VIEW_TYPE_WIDGETS_LIST) { 53 dispatchChangeStarting(oldHolder, true); 54 dispatchChangeFinished(oldHolder, true); 55 return true; 56 } 57 return super.animateChange(oldHolder, newHolder, fromLeft, fromTop, toLeft, 58 toTop); 59 } 60 } 61