Siarhei Vishniakou | cf07528 | 2020-01-15 17:35:58 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2020 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 static java.lang.annotation.RetentionPolicy.SOURCE; |
| 20 | |
| 21 | import android.annotation.IntDef; |
| 22 | import android.annotation.NonNull; |
| 23 | import android.annotation.SuppressLint; |
| 24 | import android.os.Parcel; |
| 25 | import android.os.Parcelable; |
| 26 | |
| 27 | import java.lang.annotation.Retention; |
| 28 | |
| 29 | |
| 30 | /** |
| 31 | * Base class for verified events. |
| 32 | * Verified events contain the subset of an InputEvent that the system can verify. |
| 33 | * Data contained inside VerifiedInputEvent's should be considered trusted and contain only |
| 34 | * the original event data that first came from the system. |
| 35 | * |
| 36 | * @see android.hardware.input.InputManager#verifyInputEvent(InputEvent) |
| 37 | */ |
| 38 | @SuppressLint("ParcelNotFinal") |
| 39 | public abstract class VerifiedInputEvent implements Parcelable { |
| 40 | private static final String TAG = "VerifiedInputEvent"; |
| 41 | |
| 42 | /** @hide */ |
| 43 | protected static final int VERIFIED_KEY = 1; |
| 44 | /** @hide */ |
| 45 | protected static final int VERIFIED_MOTION = 2; |
| 46 | |
| 47 | /** @hide */ |
| 48 | @Retention(SOURCE) |
| 49 | @IntDef(prefix = "VERIFIED", value = {VERIFIED_KEY, VERIFIED_MOTION}) |
| 50 | public @interface VerifiedInputEventType {}; |
| 51 | |
| 52 | @VerifiedInputEventType |
| 53 | private int mType; |
| 54 | |
| 55 | private int mDeviceId; |
| 56 | private long mEventTimeNanos; |
| 57 | private int mSource; |
| 58 | private int mDisplayId; |
| 59 | |
| 60 | /** @hide */ |
| 61 | protected VerifiedInputEvent(int type, int deviceId, long eventTimeNanos, int source, |
| 62 | int displayId) { |
| 63 | mType = type; |
| 64 | mDeviceId = deviceId; |
| 65 | mEventTimeNanos = eventTimeNanos; |
| 66 | mSource = source; |
| 67 | mDisplayId = displayId; |
| 68 | } |
| 69 | /** @hide */ |
| 70 | protected VerifiedInputEvent(@NonNull Parcel in, int expectedType) { |
| 71 | mType = in.readInt(); |
| 72 | if (mType != expectedType) { |
| 73 | throw new IllegalArgumentException("Unexpected input event type token in parcel."); |
| 74 | } |
| 75 | mDeviceId = in.readInt(); |
| 76 | mEventTimeNanos = in.readLong(); |
| 77 | mSource = in.readInt(); |
| 78 | mDisplayId = in.readInt(); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Get the id of the device that generated this event. |
| 83 | * |
| 84 | * @see InputEvent#getDeviceId() |
| 85 | */ |
| 86 | public int getDeviceId() { |
| 87 | return mDeviceId; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Get the time this event occurred, in the {@link android.os.SystemClock#uptimeMillis()} |
| 92 | * time base. |
| 93 | * |
| 94 | * @see InputEvent#getEventTime() |
| 95 | * @see KeyEvent#getEventTimeNano() |
| 96 | * @see MotionEvent#getEventTimeNano() |
| 97 | */ |
| 98 | @SuppressLint("MethodNameUnits") |
| 99 | public long getEventTimeNanos() { |
| 100 | return mEventTimeNanos; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Get the source of the event. |
| 105 | * |
| 106 | * @see InputEvent#getSource() |
| 107 | */ |
| 108 | public int getSource() { |
| 109 | return mSource; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Get the display id that is associated with this event. |
| 114 | * |
| 115 | * @see Display#getDisplayId() |
| 116 | */ |
| 117 | public int getDisplayId() { |
| 118 | return mDisplayId; |
| 119 | } |
| 120 | |
| 121 | /** {@inheritDoc} */ |
| 122 | @Override |
| 123 | public void writeToParcel(@NonNull Parcel dest, int flags) { |
| 124 | dest.writeInt(mType); |
| 125 | dest.writeInt(mDeviceId); |
| 126 | dest.writeLong(mEventTimeNanos); |
| 127 | dest.writeInt(mSource); |
| 128 | dest.writeInt(mDisplayId); |
| 129 | } |
| 130 | |
| 131 | /** {@inheritDoc} */ |
| 132 | @Override |
| 133 | public int describeContents() { |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | private static int peekInt(@NonNull Parcel parcel) { |
| 138 | final int initialDataPosition = parcel.dataPosition(); |
| 139 | int data = parcel.readInt(); |
| 140 | parcel.setDataPosition(initialDataPosition); |
| 141 | return data; |
| 142 | } |
| 143 | |
| 144 | public static final @NonNull Parcelable.Creator<VerifiedInputEvent> CREATOR = |
| 145 | new Parcelable.Creator<VerifiedInputEvent>() { |
| 146 | @Override |
| 147 | public VerifiedInputEvent[] newArray(int size) { |
| 148 | return new VerifiedInputEvent[size]; |
| 149 | } |
| 150 | |
| 151 | @Override |
| 152 | public VerifiedInputEvent createFromParcel(@NonNull Parcel in) { |
| 153 | final int type = peekInt(in); |
| 154 | if (type == VERIFIED_KEY) { |
| 155 | return VerifiedKeyEvent.CREATOR.createFromParcel(in); |
| 156 | } else if (type == VERIFIED_MOTION) { |
| 157 | return VerifiedMotionEvent.CREATOR.createFromParcel(in); |
| 158 | } |
| 159 | throw new IllegalArgumentException("Unexpected input event type in parcel."); |
| 160 | } |
| 161 | }; |
| 162 | } |