Ben Kwa | 60d91e4 | 2015-10-20 15:02:33 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 | |
Steve McKay | f68210e | 2015-11-03 15:23:16 -0800 | [diff] [blame] | 17 | package com.android.documentsui.dirlist; |
Ben Kwa | 60d91e4 | 2015-10-20 15:02:33 -0700 | [diff] [blame] | 18 | |
| 19 | import android.animation.Animator; |
| 20 | import android.animation.ArgbEvaluator; |
| 21 | import android.animation.ValueAnimator; |
| 22 | import android.content.Context; |
| 23 | import android.support.v4.util.ArrayMap; |
| 24 | import android.support.v7.widget.DefaultItemAnimator; |
| 25 | import android.support.v7.widget.RecyclerView; |
| 26 | import android.util.TypedValue; |
| 27 | |
Ben Kwa | 65d7c04 | 2015-11-10 21:02:47 -0800 | [diff] [blame] | 28 | import com.android.documentsui.R; |
| 29 | |
Ben Kwa | 60d91e4 | 2015-10-20 15:02:33 -0700 | [diff] [blame] | 30 | import java.util.ArrayList; |
| 31 | import java.util.List; |
| 32 | import java.util.Map; |
| 33 | |
| 34 | /** |
| 35 | * Performs change animations on Items in DirectoryFragment's RecyclerView. This class overrides |
| 36 | * the way selection animations are normally performed - instead of cross fading the old Item with a |
| 37 | * new Item, this class manually animates a background color change. This enables selected Items to |
| 38 | * correctly maintain focus. |
| 39 | */ |
| 40 | class DirectoryItemAnimator extends DefaultItemAnimator { |
| 41 | private final List<ColorAnimation> mPendingAnimations = new ArrayList<>(); |
| 42 | private final Map<RecyclerView.ViewHolder, ColorAnimation> mRunningAnimations = |
| 43 | new ArrayMap<>(); |
| 44 | private final Integer mDefaultColor; |
| 45 | private final Integer mSelectedColor; |
| 46 | |
| 47 | public DirectoryItemAnimator(Context context) { |
Ben Kwa | 65d7c04 | 2015-11-10 21:02:47 -0800 | [diff] [blame] | 48 | mDefaultColor = context.getResources().getColor(R.color.item_doc_background); |
| 49 | mSelectedColor = context.getResources().getColor(R.color.item_doc_background_selected); |
Ben Kwa | 60d91e4 | 2015-10-20 15:02:33 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public void runPendingAnimations() { |
| 54 | super.runPendingAnimations(); |
| 55 | for (ColorAnimation anim: mPendingAnimations) { |
| 56 | anim.start(); |
| 57 | mRunningAnimations.put(anim.viewHolder, anim); |
| 58 | } |
| 59 | mPendingAnimations.clear(); |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public void endAnimation(RecyclerView.ViewHolder vh) { |
| 64 | super.endAnimation(vh); |
| 65 | |
| 66 | for (int i = mPendingAnimations.size() - 1; i >= 0; --i) { |
| 67 | ColorAnimation anim = mPendingAnimations.get(i); |
| 68 | if (anim.viewHolder == vh) { |
| 69 | mPendingAnimations.remove(i); |
| 70 | anim.end(); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | ColorAnimation anim = mRunningAnimations.get(vh); |
| 75 | if (anim != null) { |
| 76 | anim.cancel(); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | @Override |
| 81 | public ItemHolderInfo recordPreLayoutInformation( |
| 82 | RecyclerView.State state, |
| 83 | RecyclerView.ViewHolder viewHolder, |
| 84 | @AdapterChanges int changeFlags, |
| 85 | List<Object> payloads) { |
| 86 | ItemInfo info = (ItemInfo) super.recordPreLayoutInformation(state, |
| 87 | viewHolder, changeFlags, payloads); |
| 88 | info.isActivated = viewHolder.itemView.isActivated(); |
| 89 | return info; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | @Override |
| 94 | public ItemHolderInfo recordPostLayoutInformation( |
| 95 | RecyclerView.State state, RecyclerView.ViewHolder viewHolder) { |
| 96 | ItemInfo info = (ItemInfo) super.recordPostLayoutInformation(state, |
| 97 | viewHolder); |
| 98 | info.isActivated = viewHolder.itemView.isActivated(); |
| 99 | return info; |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public boolean animateChange(final RecyclerView.ViewHolder oldHolder, |
| 104 | RecyclerView.ViewHolder newHolder, ItemHolderInfo preInfo, |
| 105 | ItemHolderInfo postInfo) { |
| 106 | if (oldHolder != newHolder) { |
| 107 | return super.animateChange(oldHolder, newHolder, preInfo, postInfo); |
| 108 | } |
| 109 | |
| 110 | ItemInfo pre = (ItemInfo)preInfo; |
| 111 | ItemInfo post = (ItemInfo)postInfo; |
| 112 | |
| 113 | if (pre.isActivated == post.isActivated) { |
| 114 | dispatchAnimationFinished(oldHolder); |
| 115 | return false; |
| 116 | } else { |
| 117 | Integer startColor = pre.isActivated ? mSelectedColor : mDefaultColor; |
| 118 | Integer endColor = post.isActivated ? mSelectedColor : mDefaultColor; |
| 119 | oldHolder.itemView.setBackgroundColor(startColor); |
| 120 | mPendingAnimations.add(new ColorAnimation(oldHolder, startColor, endColor)); |
| 121 | } |
| 122 | return true; |
| 123 | } |
| 124 | |
| 125 | @Override |
| 126 | public ItemHolderInfo obtainHolderInfo() { |
| 127 | return new ItemInfo(); |
| 128 | } |
| 129 | |
| 130 | @Override |
| 131 | public boolean canReuseUpdatedViewHolder(RecyclerView.ViewHolder vh) { |
| 132 | return true; |
| 133 | } |
| 134 | |
| 135 | class ItemInfo extends DefaultItemAnimator.ItemHolderInfo { |
| 136 | boolean isActivated; |
| 137 | }; |
| 138 | |
| 139 | /** |
| 140 | * Animates changes in background color. |
| 141 | */ |
| 142 | class ColorAnimation |
| 143 | implements ValueAnimator.AnimatorUpdateListener, Animator.AnimatorListener { |
| 144 | ValueAnimator mValueAnimator; |
| 145 | final RecyclerView.ViewHolder viewHolder; |
| 146 | int mEndColor; |
| 147 | |
| 148 | public ColorAnimation(RecyclerView.ViewHolder vh, int startColor, int endColor) |
| 149 | { |
| 150 | viewHolder = vh; |
| 151 | mValueAnimator = ValueAnimator.ofObject(new ArgbEvaluator(), startColor, endColor); |
| 152 | mValueAnimator.addUpdateListener(this); |
| 153 | mValueAnimator.addListener(this); |
| 154 | |
| 155 | mEndColor = endColor; |
| 156 | } |
| 157 | |
| 158 | public void start() { |
| 159 | mValueAnimator.start(); |
| 160 | } |
| 161 | |
| 162 | public void cancel() { |
| 163 | mValueAnimator.cancel(); |
| 164 | } |
| 165 | |
| 166 | public void end() { |
| 167 | mValueAnimator.end(); |
| 168 | } |
| 169 | |
| 170 | @Override |
| 171 | public void onAnimationUpdate(ValueAnimator animator) { |
| 172 | viewHolder.itemView.setBackgroundColor((Integer)animator.getAnimatedValue()); |
| 173 | } |
| 174 | |
| 175 | @Override |
| 176 | public void onAnimationEnd(Animator animator) { |
| 177 | viewHolder.itemView.setBackgroundColor(mEndColor); |
| 178 | mRunningAnimations.remove(viewHolder); |
| 179 | dispatchAnimationFinished(viewHolder); |
| 180 | } |
| 181 | |
| 182 | @Override |
| 183 | public void onAnimationStart(Animator animation) { |
| 184 | dispatchAnimationStarted(viewHolder); |
| 185 | } |
| 186 | |
| 187 | @Override |
| 188 | public void onAnimationCancel(Animator animation) {} |
| 189 | |
| 190 | @Override |
| 191 | public void onAnimationRepeat(Animator animation) {} |
| 192 | }; |
| 193 | }; |