Jorim Jaggi | 57157ac | 2019-01-22 19:01:48 +0100 | [diff] [blame^] | 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 | |
| 17 | package android.view; |
| 18 | |
| 19 | import android.os.CancellationSignal; |
| 20 | import android.view.WindowInsets.Type.InsetsType; |
| 21 | import android.view.animation.Interpolator; |
| 22 | |
| 23 | import com.android.internal.annotations.VisibleForTesting; |
| 24 | |
| 25 | import java.util.ArrayList; |
| 26 | |
| 27 | /** |
| 28 | * An insets controller that keeps track of pending requests. This is such that an app can freely |
| 29 | * use {@link WindowInsetsController} before the view root is attached during activity startup. |
| 30 | * @hide |
| 31 | */ |
| 32 | public class PendingInsetsController implements WindowInsetsController { |
| 33 | |
| 34 | private static final int KEEP_BEHAVIOR = -1; |
| 35 | private final ArrayList<PendingRequest> mRequests = new ArrayList<>(); |
| 36 | private @Appearance int mAppearance; |
| 37 | private @Appearance int mAppearanceMask; |
| 38 | private @Behavior int mBehavior = KEEP_BEHAVIOR; |
| 39 | private final InsetsState mDummyState = new InsetsState(); |
| 40 | private InsetsController mReplayedInsetsController; |
| 41 | |
| 42 | @Override |
| 43 | public void show(int types) { |
| 44 | if (mReplayedInsetsController != null) { |
| 45 | mReplayedInsetsController.show(types); |
| 46 | } else { |
| 47 | mRequests.add(new ShowRequest(types)); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | @Override |
| 52 | public void hide(int types) { |
| 53 | if (mReplayedInsetsController != null) { |
| 54 | mReplayedInsetsController.hide(types); |
| 55 | } else { |
| 56 | mRequests.add(new HideRequest(types)); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | @Override |
| 61 | public CancellationSignal controlWindowInsetsAnimation(int types, long durationMillis, |
| 62 | Interpolator interpolator, |
| 63 | WindowInsetsAnimationControlListener listener) { |
| 64 | if (mReplayedInsetsController != null) { |
| 65 | return mReplayedInsetsController.controlWindowInsetsAnimation(types, durationMillis, |
| 66 | interpolator, listener); |
| 67 | } else { |
| 68 | listener.onCancelled(); |
| 69 | CancellationSignal cancellationSignal = new CancellationSignal(); |
| 70 | cancellationSignal.cancel(); |
| 71 | return cancellationSignal; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | @Override |
| 76 | public void setSystemBarsAppearance(int appearance, int mask) { |
| 77 | if (mReplayedInsetsController != null) { |
| 78 | mReplayedInsetsController.setSystemBarsAppearance(appearance, mask); |
| 79 | } else { |
| 80 | mAppearance = (mAppearance & ~mask) | (appearance & mask); |
| 81 | mAppearanceMask |= mask; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | @Override |
| 86 | public int getSystemBarsAppearance() { |
| 87 | if (mReplayedInsetsController != null) { |
| 88 | return mReplayedInsetsController.getSystemBarsAppearance(); |
| 89 | } |
| 90 | return mAppearance; |
| 91 | } |
| 92 | |
| 93 | @Override |
| 94 | public void setSystemBarsBehavior(int behavior) { |
| 95 | if (mReplayedInsetsController != null) { |
| 96 | mReplayedInsetsController.setSystemBarsBehavior(behavior); |
| 97 | } else { |
| 98 | mBehavior = behavior; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public int getSystemBarsBehavior() { |
| 104 | if (mReplayedInsetsController != null) { |
| 105 | return mReplayedInsetsController.getSystemBarsBehavior(); |
| 106 | } |
| 107 | return mBehavior; |
| 108 | } |
| 109 | |
| 110 | @Override |
| 111 | public InsetsState getState() { |
| 112 | return mDummyState; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Replays the commands on {@code controller} and attaches it to this instance such that any |
| 117 | * calls will be forwarded to the real instance in the future. |
| 118 | */ |
| 119 | @VisibleForTesting |
| 120 | public void replayAndAttach(InsetsController controller) { |
| 121 | if (mBehavior != KEEP_BEHAVIOR) { |
| 122 | controller.setSystemBarsBehavior(mBehavior); |
| 123 | } |
| 124 | if (mAppearanceMask != 0) { |
| 125 | controller.setSystemBarsAppearance(mAppearance, mAppearanceMask); |
| 126 | } |
| 127 | int size = mRequests.size(); |
| 128 | for (int i = 0; i < size; i++) { |
| 129 | mRequests.get(i).replay(controller); |
| 130 | } |
| 131 | |
| 132 | // Reset all state so it doesn't get applied twice just in case |
| 133 | mRequests.clear(); |
| 134 | mBehavior = KEEP_BEHAVIOR; |
| 135 | mAppearance = 0; |
| 136 | mAppearanceMask = 0; |
| 137 | |
| 138 | // After replaying, we forward everything directly to the replayed instance. |
| 139 | mReplayedInsetsController = controller; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Detaches the controller to no longer forward calls to the real instance. |
| 144 | */ |
| 145 | @VisibleForTesting |
| 146 | public void detach() { |
| 147 | mReplayedInsetsController = null; |
| 148 | } |
| 149 | |
| 150 | private interface PendingRequest { |
| 151 | void replay(InsetsController controller); |
| 152 | } |
| 153 | |
| 154 | private static class ShowRequest implements PendingRequest { |
| 155 | |
| 156 | private final @InsetsType int mTypes; |
| 157 | |
| 158 | public ShowRequest(int types) { |
| 159 | mTypes = types; |
| 160 | } |
| 161 | |
| 162 | @Override |
| 163 | public void replay(InsetsController controller) { |
| 164 | controller.show(mTypes); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | private static class HideRequest implements PendingRequest { |
| 169 | |
| 170 | private final @InsetsType int mTypes; |
| 171 | |
| 172 | public HideRequest(int types) { |
| 173 | mTypes = types; |
| 174 | } |
| 175 | |
| 176 | @Override |
| 177 | public void replay(InsetsController controller) { |
| 178 | controller.hide(mTypes); |
| 179 | } |
| 180 | } |
| 181 | } |