Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 | |
Mathew Inwood | e5ad598 | 2018-08-17 15:07:52 +0100 | [diff] [blame^] | 19 | import android.annotation.UnsupportedAppUsage; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 20 | import android.os.Build; |
| 21 | import android.util.Log; |
| 22 | |
| 23 | /** |
| 24 | * Checks whether a sequence of input events is self-consistent. |
| 25 | * Logs a description of each problem detected. |
| 26 | * <p> |
| 27 | * When a problem is detected, the event is tainted. This mechanism prevents the same |
| 28 | * error from being reported multiple times. |
| 29 | * </p> |
| 30 | * |
| 31 | * @hide |
| 32 | */ |
| 33 | public final class InputEventConsistencyVerifier { |
Jeff Sharkey | 5ab0243 | 2017-06-27 11:01:36 -0600 | [diff] [blame] | 34 | private static final boolean IS_ENG_BUILD = Build.IS_ENG; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 35 | |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 36 | private static final String EVENT_TYPE_KEY = "KeyEvent"; |
| 37 | private static final String EVENT_TYPE_TRACKBALL = "TrackballEvent"; |
| 38 | private static final String EVENT_TYPE_TOUCH = "TouchEvent"; |
| 39 | private static final String EVENT_TYPE_GENERIC_MOTION = "GenericMotionEvent"; |
| 40 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 41 | // The number of recent events to log when a problem is detected. |
| 42 | // Can be set to 0 to disable logging recent events but the runtime overhead of |
| 43 | // this feature is negligible on current hardware. |
| 44 | private static final int RECENT_EVENTS_TO_LOG = 5; |
| 45 | |
| 46 | // The object to which the verifier is attached. |
| 47 | private final Object mCaller; |
| 48 | |
| 49 | // Consistency verifier flags. |
| 50 | private final int mFlags; |
| 51 | |
Svetoslav Ganov | 736c275 | 2011-04-22 18:30:36 -0700 | [diff] [blame] | 52 | // Tag for logging which a client can set to help distinguish the output |
| 53 | // from different verifiers since several can be active at the same time. |
| 54 | // If not provided defaults to the simple class name. |
| 55 | private final String mLogTag; |
| 56 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 57 | // The most recently checked event and the nesting level at which it was checked. |
| 58 | // This is only set when the verifier is called from a nesting level greater than 0 |
| 59 | // so that the verifier can detect when it has been asked to verify the same event twice. |
| 60 | // It does not make sense to examine the contents of the last event since it may have |
| 61 | // been recycled. |
Jeff Brown | 32cbc3855 | 2011-12-01 14:01:49 -0800 | [diff] [blame] | 62 | private int mLastEventSeq; |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 63 | private String mLastEventType; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 64 | private int mLastNestingLevel; |
| 65 | |
| 66 | // Copy of the most recent events. |
| 67 | private InputEvent[] mRecentEvents; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 68 | private boolean[] mRecentEventsUnhandled; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 69 | private int mMostRecentEventIndex; |
| 70 | |
| 71 | // Current event and its type. |
| 72 | private InputEvent mCurrentEvent; |
| 73 | private String mCurrentEventType; |
| 74 | |
| 75 | // Linked list of key state objects. |
| 76 | private KeyState mKeyStateList; |
| 77 | |
| 78 | // Current state of the trackball. |
| 79 | private boolean mTrackballDown; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 80 | private boolean mTrackballUnhandled; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 81 | |
| 82 | // Bitfield of pointer ids that are currently down. |
| 83 | // Assumes that the largest possible pointer id is 31, which is potentially subject to change. |
| 84 | // (See MAX_POINTER_ID in frameworks/base/include/ui/Input.h) |
| 85 | private int mTouchEventStreamPointers; |
| 86 | |
| 87 | // The device id and source of the current stream of touch events. |
| 88 | private int mTouchEventStreamDeviceId = -1; |
| 89 | private int mTouchEventStreamSource; |
| 90 | |
| 91 | // Set to true when we discover that the touch event stream is inconsistent. |
| 92 | // Reset on down or cancel. |
| 93 | private boolean mTouchEventStreamIsTainted; |
| 94 | |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 95 | // Set to true if the touch event stream is partially unhandled. |
| 96 | private boolean mTouchEventStreamUnhandled; |
| 97 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 98 | // Set to true if we received hover enter. |
| 99 | private boolean mHoverEntered; |
| 100 | |
Michael Wright | 5bd69e6 | 2015-05-14 14:48:08 +0100 | [diff] [blame] | 101 | // The bitset of buttons which we've received ACTION_BUTTON_PRESS for. |
| 102 | private int mButtonsPressed; |
| 103 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 104 | // The current violation message. |
| 105 | private StringBuilder mViolationMessage; |
| 106 | |
| 107 | /** |
| 108 | * Indicates that the verifier is intended to act on raw device input event streams. |
| 109 | * Disables certain checks for invariants that are established by the input dispatcher |
| 110 | * itself as it delivers input events, such as key repeating behavior. |
| 111 | */ |
| 112 | public static final int FLAG_RAW_DEVICE_INPUT = 1 << 0; |
| 113 | |
| 114 | /** |
| 115 | * Creates an input consistency verifier. |
| 116 | * @param caller The object to which the verifier is attached. |
| 117 | * @param flags Flags to the verifier, or 0 if none. |
| 118 | */ |
Mathew Inwood | e5ad598 | 2018-08-17 15:07:52 +0100 | [diff] [blame^] | 119 | @UnsupportedAppUsage |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 120 | public InputEventConsistencyVerifier(Object caller, int flags) { |
Michael Wright | 957d620 | 2014-05-13 15:11:58 -0700 | [diff] [blame] | 121 | this(caller, flags, null); |
Svetoslav Ganov | 736c275 | 2011-04-22 18:30:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Creates an input consistency verifier. |
| 126 | * @param caller The object to which the verifier is attached. |
| 127 | * @param flags Flags to the verifier, or 0 if none. |
| 128 | * @param logTag Tag for logging. If null defaults to the short class name. |
| 129 | */ |
| 130 | public InputEventConsistencyVerifier(Object caller, int flags, String logTag) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 131 | this.mCaller = caller; |
| 132 | this.mFlags = flags; |
Svetoslav Ganov | 736c275 | 2011-04-22 18:30:36 -0700 | [diff] [blame] | 133 | this.mLogTag = (logTag != null) ? logTag : "InputEventConsistencyVerifier"; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Determines whether the instrumentation should be enabled. |
| 138 | * @return True if it should be enabled. |
| 139 | */ |
Mathew Inwood | e5ad598 | 2018-08-17 15:07:52 +0100 | [diff] [blame^] | 140 | @UnsupportedAppUsage |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 141 | public static boolean isInstrumentationEnabled() { |
| 142 | return IS_ENG_BUILD; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Resets the state of the input event consistency verifier. |
| 147 | */ |
| 148 | public void reset() { |
Jeff Brown | 32cbc3855 | 2011-12-01 14:01:49 -0800 | [diff] [blame] | 149 | mLastEventSeq = -1; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 150 | mLastNestingLevel = 0; |
| 151 | mTrackballDown = false; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 152 | mTrackballUnhandled = false; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 153 | mTouchEventStreamPointers = 0; |
| 154 | mTouchEventStreamIsTainted = false; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 155 | mTouchEventStreamUnhandled = false; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 156 | mHoverEntered = false; |
Michael Wright | 5bd69e6 | 2015-05-14 14:48:08 +0100 | [diff] [blame] | 157 | mButtonsPressed = 0; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 158 | |
| 159 | while (mKeyStateList != null) { |
| 160 | final KeyState state = mKeyStateList; |
| 161 | mKeyStateList = state.next; |
| 162 | state.recycle(); |
| 163 | } |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Checks an arbitrary input event. |
| 168 | * @param event The event. |
| 169 | * @param nestingLevel The nesting level: 0 if called from the base class, |
| 170 | * or 1 from a subclass. If the event was already checked by this consistency verifier |
| 171 | * at a higher nesting level, it will not be checked again. Used to handle the situation |
| 172 | * where a subclass dispatching method delegates to its superclass's dispatching method |
| 173 | * and both dispatching methods call into the consistency verifier. |
| 174 | */ |
| 175 | public void onInputEvent(InputEvent event, int nestingLevel) { |
| 176 | if (event instanceof KeyEvent) { |
| 177 | final KeyEvent keyEvent = (KeyEvent)event; |
| 178 | onKeyEvent(keyEvent, nestingLevel); |
| 179 | } else { |
| 180 | final MotionEvent motionEvent = (MotionEvent)event; |
| 181 | if (motionEvent.isTouchEvent()) { |
| 182 | onTouchEvent(motionEvent, nestingLevel); |
| 183 | } else if ((motionEvent.getSource() & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) { |
| 184 | onTrackballEvent(motionEvent, nestingLevel); |
| 185 | } else { |
| 186 | onGenericMotionEvent(motionEvent, nestingLevel); |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Checks a key event. |
| 193 | * @param event The event. |
| 194 | * @param nestingLevel The nesting level: 0 if called from the base class, |
| 195 | * or 1 from a subclass. If the event was already checked by this consistency verifier |
| 196 | * at a higher nesting level, it will not be checked again. Used to handle the situation |
| 197 | * where a subclass dispatching method delegates to its superclass's dispatching method |
| 198 | * and both dispatching methods call into the consistency verifier. |
| 199 | */ |
| 200 | public void onKeyEvent(KeyEvent event, int nestingLevel) { |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 201 | if (!startEvent(event, nestingLevel, EVENT_TYPE_KEY)) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 202 | return; |
| 203 | } |
| 204 | |
| 205 | try { |
| 206 | ensureMetaStateIsNormalized(event.getMetaState()); |
| 207 | |
| 208 | final int action = event.getAction(); |
| 209 | final int deviceId = event.getDeviceId(); |
| 210 | final int source = event.getSource(); |
| 211 | final int keyCode = event.getKeyCode(); |
| 212 | switch (action) { |
| 213 | case KeyEvent.ACTION_DOWN: { |
| 214 | KeyState state = findKeyState(deviceId, source, keyCode, /*remove*/ false); |
| 215 | if (state != null) { |
| 216 | // If the key is already down, ensure it is a repeat. |
| 217 | // We don't perform this check when processing raw device input |
| 218 | // because the input dispatcher itself is responsible for setting |
| 219 | // the key repeat count before it delivers input events. |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 220 | if (state.unhandled) { |
| 221 | state.unhandled = false; |
| 222 | } else if ((mFlags & FLAG_RAW_DEVICE_INPUT) == 0 |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 223 | && event.getRepeatCount() == 0) { |
| 224 | problem("ACTION_DOWN but key is already down and this event " |
| 225 | + "is not a key repeat."); |
| 226 | } |
| 227 | } else { |
| 228 | addKeyState(deviceId, source, keyCode); |
| 229 | } |
| 230 | break; |
| 231 | } |
| 232 | case KeyEvent.ACTION_UP: { |
| 233 | KeyState state = findKeyState(deviceId, source, keyCode, /*remove*/ true); |
| 234 | if (state == null) { |
| 235 | problem("ACTION_UP but key was not down."); |
| 236 | } else { |
| 237 | state.recycle(); |
| 238 | } |
| 239 | break; |
| 240 | } |
| 241 | case KeyEvent.ACTION_MULTIPLE: |
| 242 | break; |
| 243 | default: |
| 244 | problem("Invalid action " + KeyEvent.actionToString(action) |
| 245 | + " for key event."); |
| 246 | break; |
| 247 | } |
| 248 | } finally { |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 249 | finishEvent(); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 250 | } |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Checks a trackball event. |
| 255 | * @param event The event. |
| 256 | * @param nestingLevel The nesting level: 0 if called from the base class, |
| 257 | * or 1 from a subclass. If the event was already checked by this consistency verifier |
| 258 | * at a higher nesting level, it will not be checked again. Used to handle the situation |
| 259 | * where a subclass dispatching method delegates to its superclass's dispatching method |
| 260 | * and both dispatching methods call into the consistency verifier. |
| 261 | */ |
| 262 | public void onTrackballEvent(MotionEvent event, int nestingLevel) { |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 263 | if (!startEvent(event, nestingLevel, EVENT_TYPE_TRACKBALL)) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 264 | return; |
| 265 | } |
| 266 | |
| 267 | try { |
| 268 | ensureMetaStateIsNormalized(event.getMetaState()); |
| 269 | |
| 270 | final int action = event.getAction(); |
| 271 | final int source = event.getSource(); |
| 272 | if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) { |
| 273 | switch (action) { |
| 274 | case MotionEvent.ACTION_DOWN: |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 275 | if (mTrackballDown && !mTrackballUnhandled) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 276 | problem("ACTION_DOWN but trackball is already down."); |
| 277 | } else { |
| 278 | mTrackballDown = true; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 279 | mTrackballUnhandled = false; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 280 | } |
| 281 | ensureHistorySizeIsZeroForThisAction(event); |
| 282 | ensurePointerCountIsOneForThisAction(event); |
| 283 | break; |
| 284 | case MotionEvent.ACTION_UP: |
| 285 | if (!mTrackballDown) { |
| 286 | problem("ACTION_UP but trackball is not down."); |
| 287 | } else { |
| 288 | mTrackballDown = false; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 289 | mTrackballUnhandled = false; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 290 | } |
| 291 | ensureHistorySizeIsZeroForThisAction(event); |
| 292 | ensurePointerCountIsOneForThisAction(event); |
| 293 | break; |
| 294 | case MotionEvent.ACTION_MOVE: |
| 295 | ensurePointerCountIsOneForThisAction(event); |
| 296 | break; |
| 297 | default: |
| 298 | problem("Invalid action " + MotionEvent.actionToString(action) |
| 299 | + " for trackball event."); |
| 300 | break; |
| 301 | } |
| 302 | |
| 303 | if (mTrackballDown && event.getPressure() <= 0) { |
| 304 | problem("Trackball is down but pressure is not greater than 0."); |
| 305 | } else if (!mTrackballDown && event.getPressure() != 0) { |
| 306 | problem("Trackball is up but pressure is not equal to 0."); |
| 307 | } |
| 308 | } else { |
| 309 | problem("Source was not SOURCE_CLASS_TRACKBALL."); |
| 310 | } |
| 311 | } finally { |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 312 | finishEvent(); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 313 | } |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Checks a touch event. |
| 318 | * @param event The event. |
| 319 | * @param nestingLevel The nesting level: 0 if called from the base class, |
| 320 | * or 1 from a subclass. If the event was already checked by this consistency verifier |
| 321 | * at a higher nesting level, it will not be checked again. Used to handle the situation |
| 322 | * where a subclass dispatching method delegates to its superclass's dispatching method |
| 323 | * and both dispatching methods call into the consistency verifier. |
| 324 | */ |
Mathew Inwood | e5ad598 | 2018-08-17 15:07:52 +0100 | [diff] [blame^] | 325 | @UnsupportedAppUsage |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 326 | public void onTouchEvent(MotionEvent event, int nestingLevel) { |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 327 | if (!startEvent(event, nestingLevel, EVENT_TYPE_TOUCH)) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 328 | return; |
| 329 | } |
| 330 | |
| 331 | final int action = event.getAction(); |
| 332 | final boolean newStream = action == MotionEvent.ACTION_DOWN |
Victoria Lease | b38070c | 2012-08-24 13:46:02 -0700 | [diff] [blame] | 333 | || action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_OUTSIDE; |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 334 | if (newStream && (mTouchEventStreamIsTainted || mTouchEventStreamUnhandled)) { |
| 335 | mTouchEventStreamIsTainted = false; |
| 336 | mTouchEventStreamUnhandled = false; |
| 337 | mTouchEventStreamPointers = 0; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 338 | } |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 339 | if (mTouchEventStreamIsTainted) { |
| 340 | event.setTainted(true); |
| 341 | } |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 342 | |
| 343 | try { |
| 344 | ensureMetaStateIsNormalized(event.getMetaState()); |
| 345 | |
| 346 | final int deviceId = event.getDeviceId(); |
| 347 | final int source = event.getSource(); |
| 348 | |
| 349 | if (!newStream && mTouchEventStreamDeviceId != -1 |
| 350 | && (mTouchEventStreamDeviceId != deviceId |
| 351 | || mTouchEventStreamSource != source)) { |
| 352 | problem("Touch event stream contains events from multiple sources: " |
| 353 | + "previous device id " + mTouchEventStreamDeviceId |
| 354 | + ", previous source " + Integer.toHexString(mTouchEventStreamSource) |
| 355 | + ", new device id " + deviceId |
| 356 | + ", new source " + Integer.toHexString(source)); |
| 357 | } |
| 358 | mTouchEventStreamDeviceId = deviceId; |
| 359 | mTouchEventStreamSource = source; |
| 360 | |
| 361 | final int pointerCount = event.getPointerCount(); |
| 362 | if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { |
| 363 | switch (action) { |
| 364 | case MotionEvent.ACTION_DOWN: |
| 365 | if (mTouchEventStreamPointers != 0) { |
| 366 | problem("ACTION_DOWN but pointers are already down. " |
| 367 | + "Probably missing ACTION_UP from previous gesture."); |
| 368 | } |
| 369 | ensureHistorySizeIsZeroForThisAction(event); |
| 370 | ensurePointerCountIsOneForThisAction(event); |
| 371 | mTouchEventStreamPointers = 1 << event.getPointerId(0); |
| 372 | break; |
| 373 | case MotionEvent.ACTION_UP: |
| 374 | ensureHistorySizeIsZeroForThisAction(event); |
| 375 | ensurePointerCountIsOneForThisAction(event); |
| 376 | mTouchEventStreamPointers = 0; |
| 377 | mTouchEventStreamIsTainted = false; |
| 378 | break; |
| 379 | case MotionEvent.ACTION_MOVE: { |
| 380 | final int expectedPointerCount = |
| 381 | Integer.bitCount(mTouchEventStreamPointers); |
| 382 | if (pointerCount != expectedPointerCount) { |
| 383 | problem("ACTION_MOVE contained " + pointerCount |
| 384 | + " pointers but there are currently " |
| 385 | + expectedPointerCount + " pointers down."); |
| 386 | mTouchEventStreamIsTainted = true; |
| 387 | } |
| 388 | break; |
| 389 | } |
| 390 | case MotionEvent.ACTION_CANCEL: |
| 391 | mTouchEventStreamPointers = 0; |
| 392 | mTouchEventStreamIsTainted = false; |
| 393 | break; |
| 394 | case MotionEvent.ACTION_OUTSIDE: |
| 395 | if (mTouchEventStreamPointers != 0) { |
| 396 | problem("ACTION_OUTSIDE but pointers are still down."); |
| 397 | } |
| 398 | ensureHistorySizeIsZeroForThisAction(event); |
| 399 | ensurePointerCountIsOneForThisAction(event); |
| 400 | mTouchEventStreamIsTainted = false; |
| 401 | break; |
| 402 | default: { |
| 403 | final int actionMasked = event.getActionMasked(); |
| 404 | final int actionIndex = event.getActionIndex(); |
| 405 | if (actionMasked == MotionEvent.ACTION_POINTER_DOWN) { |
| 406 | if (mTouchEventStreamPointers == 0) { |
| 407 | problem("ACTION_POINTER_DOWN but no other pointers were down."); |
| 408 | mTouchEventStreamIsTainted = true; |
| 409 | } |
| 410 | if (actionIndex < 0 || actionIndex >= pointerCount) { |
| 411 | problem("ACTION_POINTER_DOWN index is " + actionIndex |
| 412 | + " but the pointer count is " + pointerCount + "."); |
| 413 | mTouchEventStreamIsTainted = true; |
| 414 | } else { |
| 415 | final int id = event.getPointerId(actionIndex); |
| 416 | final int idBit = 1 << id; |
| 417 | if ((mTouchEventStreamPointers & idBit) != 0) { |
| 418 | problem("ACTION_POINTER_DOWN specified pointer id " + id |
| 419 | + " which is already down."); |
| 420 | mTouchEventStreamIsTainted = true; |
| 421 | } else { |
| 422 | mTouchEventStreamPointers |= idBit; |
| 423 | } |
| 424 | } |
| 425 | ensureHistorySizeIsZeroForThisAction(event); |
| 426 | } else if (actionMasked == MotionEvent.ACTION_POINTER_UP) { |
| 427 | if (actionIndex < 0 || actionIndex >= pointerCount) { |
| 428 | problem("ACTION_POINTER_UP index is " + actionIndex |
| 429 | + " but the pointer count is " + pointerCount + "."); |
| 430 | mTouchEventStreamIsTainted = true; |
| 431 | } else { |
| 432 | final int id = event.getPointerId(actionIndex); |
| 433 | final int idBit = 1 << id; |
| 434 | if ((mTouchEventStreamPointers & idBit) == 0) { |
| 435 | problem("ACTION_POINTER_UP specified pointer id " + id |
| 436 | + " which is not currently down."); |
| 437 | mTouchEventStreamIsTainted = true; |
| 438 | } else { |
| 439 | mTouchEventStreamPointers &= ~idBit; |
| 440 | } |
| 441 | } |
| 442 | ensureHistorySizeIsZeroForThisAction(event); |
| 443 | } else { |
| 444 | problem("Invalid action " + MotionEvent.actionToString(action) |
| 445 | + " for touch event."); |
| 446 | } |
| 447 | break; |
| 448 | } |
| 449 | } |
| 450 | } else { |
| 451 | problem("Source was not SOURCE_CLASS_POINTER."); |
| 452 | } |
| 453 | } finally { |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 454 | finishEvent(); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 455 | } |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Checks a generic motion event. |
| 460 | * @param event The event. |
| 461 | * @param nestingLevel The nesting level: 0 if called from the base class, |
| 462 | * or 1 from a subclass. If the event was already checked by this consistency verifier |
| 463 | * at a higher nesting level, it will not be checked again. Used to handle the situation |
| 464 | * where a subclass dispatching method delegates to its superclass's dispatching method |
| 465 | * and both dispatching methods call into the consistency verifier. |
| 466 | */ |
| 467 | public void onGenericMotionEvent(MotionEvent event, int nestingLevel) { |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 468 | if (!startEvent(event, nestingLevel, EVENT_TYPE_GENERIC_MOTION)) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 469 | return; |
| 470 | } |
| 471 | |
| 472 | try { |
| 473 | ensureMetaStateIsNormalized(event.getMetaState()); |
| 474 | |
| 475 | final int action = event.getAction(); |
| 476 | final int source = event.getSource(); |
Michael Wright | 5bd69e6 | 2015-05-14 14:48:08 +0100 | [diff] [blame] | 477 | final int buttonState = event.getButtonState(); |
| 478 | final int actionButton = event.getActionButton(); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 479 | if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { |
| 480 | switch (action) { |
| 481 | case MotionEvent.ACTION_HOVER_ENTER: |
| 482 | ensurePointerCountIsOneForThisAction(event); |
| 483 | mHoverEntered = true; |
| 484 | break; |
| 485 | case MotionEvent.ACTION_HOVER_MOVE: |
| 486 | ensurePointerCountIsOneForThisAction(event); |
| 487 | break; |
| 488 | case MotionEvent.ACTION_HOVER_EXIT: |
| 489 | ensurePointerCountIsOneForThisAction(event); |
| 490 | if (!mHoverEntered) { |
| 491 | problem("ACTION_HOVER_EXIT without prior ACTION_HOVER_ENTER"); |
| 492 | } |
| 493 | mHoverEntered = false; |
| 494 | break; |
| 495 | case MotionEvent.ACTION_SCROLL: |
| 496 | ensureHistorySizeIsZeroForThisAction(event); |
| 497 | ensurePointerCountIsOneForThisAction(event); |
| 498 | break; |
Michael Wright | 5bd69e6 | 2015-05-14 14:48:08 +0100 | [diff] [blame] | 499 | case MotionEvent.ACTION_BUTTON_PRESS: |
| 500 | ensureActionButtonIsNonZeroForThisAction(event); |
| 501 | if ((mButtonsPressed & actionButton) != 0) { |
| 502 | problem("Action button for ACTION_BUTTON_PRESS event is " + |
| 503 | actionButton + ", but it has already been pressed and " + |
| 504 | "has yet to be released."); |
| 505 | } |
| 506 | |
| 507 | mButtonsPressed |= actionButton; |
| 508 | // The system will automatically mirror the stylus buttons onto the button |
| 509 | // state as the old set of generic buttons for apps targeting pre-M. If |
| 510 | // it looks this has happened, go ahead and set the generic buttons as |
| 511 | // pressed to prevent spurious errors. |
| 512 | if (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY && |
| 513 | (buttonState & MotionEvent.BUTTON_SECONDARY) != 0) { |
| 514 | mButtonsPressed |= MotionEvent.BUTTON_SECONDARY; |
| 515 | } else if (actionButton == MotionEvent.BUTTON_STYLUS_SECONDARY && |
| 516 | (buttonState & MotionEvent.BUTTON_TERTIARY) != 0) { |
| 517 | mButtonsPressed |= MotionEvent.BUTTON_TERTIARY; |
| 518 | } |
| 519 | |
| 520 | if (mButtonsPressed != buttonState) { |
| 521 | problem(String.format("Reported button state differs from " + |
| 522 | "expected button state based on press and release events. " + |
| 523 | "Is 0x%08x but expected 0x%08x.", |
| 524 | buttonState, mButtonsPressed)); |
| 525 | } |
| 526 | break; |
| 527 | case MotionEvent.ACTION_BUTTON_RELEASE: |
| 528 | ensureActionButtonIsNonZeroForThisAction(event); |
| 529 | if ((mButtonsPressed & actionButton) != actionButton) { |
| 530 | problem("Action button for ACTION_BUTTON_RELEASE event is " + |
| 531 | actionButton + ", but it was either never pressed or has " + |
| 532 | "already been released."); |
| 533 | } |
| 534 | |
| 535 | mButtonsPressed &= ~actionButton; |
| 536 | // The system will automatically mirror the stylus buttons onto the button |
| 537 | // state as the old set of generic buttons for apps targeting pre-M. If |
| 538 | // it looks this has happened, go ahead and set the generic buttons as |
| 539 | // released to prevent spurious errors. |
| 540 | if (actionButton == MotionEvent.BUTTON_STYLUS_PRIMARY && |
| 541 | (buttonState & MotionEvent.BUTTON_SECONDARY) == 0) { |
| 542 | mButtonsPressed &= ~MotionEvent.BUTTON_SECONDARY; |
| 543 | } else if (actionButton == MotionEvent.BUTTON_STYLUS_SECONDARY && |
| 544 | (buttonState & MotionEvent.BUTTON_TERTIARY) == 0) { |
| 545 | mButtonsPressed &= ~MotionEvent.BUTTON_TERTIARY; |
| 546 | } |
| 547 | |
| 548 | if (mButtonsPressed != buttonState) { |
| 549 | problem(String.format("Reported button state differs from " + |
| 550 | "expected button state based on press and release events. " + |
| 551 | "Is 0x%08x but expected 0x%08x.", |
| 552 | buttonState, mButtonsPressed)); |
| 553 | } |
| 554 | break; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 555 | default: |
| 556 | problem("Invalid action for generic pointer event."); |
| 557 | break; |
| 558 | } |
| 559 | } else if ((source & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { |
| 560 | switch (action) { |
| 561 | case MotionEvent.ACTION_MOVE: |
| 562 | ensurePointerCountIsOneForThisAction(event); |
| 563 | break; |
| 564 | default: |
| 565 | problem("Invalid action for generic joystick event."); |
| 566 | break; |
| 567 | } |
| 568 | } |
| 569 | } finally { |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 570 | finishEvent(); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 571 | } |
| 572 | } |
| 573 | |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 574 | /** |
| 575 | * Notifies the verifier that a given event was unhandled and the rest of the |
| 576 | * trace for the event should be ignored. |
| 577 | * This method should only be called if the event was previously checked by |
| 578 | * the consistency verifier using {@link #onInputEvent} and other methods. |
| 579 | * @param event The event. |
| 580 | * @param nestingLevel The nesting level: 0 if called from the base class, |
| 581 | * or 1 from a subclass. If the event was already checked by this consistency verifier |
| 582 | * at a higher nesting level, it will not be checked again. Used to handle the situation |
| 583 | * where a subclass dispatching method delegates to its superclass's dispatching method |
| 584 | * and both dispatching methods call into the consistency verifier. |
| 585 | */ |
Mathew Inwood | e5ad598 | 2018-08-17 15:07:52 +0100 | [diff] [blame^] | 586 | @UnsupportedAppUsage |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 587 | public void onUnhandledEvent(InputEvent event, int nestingLevel) { |
| 588 | if (nestingLevel != mLastNestingLevel) { |
| 589 | return; |
| 590 | } |
| 591 | |
| 592 | if (mRecentEventsUnhandled != null) { |
| 593 | mRecentEventsUnhandled[mMostRecentEventIndex] = true; |
| 594 | } |
| 595 | |
| 596 | if (event instanceof KeyEvent) { |
| 597 | final KeyEvent keyEvent = (KeyEvent)event; |
| 598 | final int deviceId = keyEvent.getDeviceId(); |
| 599 | final int source = keyEvent.getSource(); |
| 600 | final int keyCode = keyEvent.getKeyCode(); |
| 601 | final KeyState state = findKeyState(deviceId, source, keyCode, /*remove*/ false); |
| 602 | if (state != null) { |
| 603 | state.unhandled = true; |
| 604 | } |
| 605 | } else { |
| 606 | final MotionEvent motionEvent = (MotionEvent)event; |
| 607 | if (motionEvent.isTouchEvent()) { |
| 608 | mTouchEventStreamUnhandled = true; |
| 609 | } else if ((motionEvent.getSource() & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) { |
| 610 | if (mTrackballDown) { |
| 611 | mTrackballUnhandled = true; |
| 612 | } |
| 613 | } |
| 614 | } |
| 615 | } |
| 616 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 617 | private void ensureMetaStateIsNormalized(int metaState) { |
| 618 | final int normalizedMetaState = KeyEvent.normalizeMetaState(metaState); |
| 619 | if (normalizedMetaState != metaState) { |
| 620 | problem(String.format("Metastate not normalized. Was 0x%08x but expected 0x%08x.", |
| 621 | metaState, normalizedMetaState)); |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | private void ensurePointerCountIsOneForThisAction(MotionEvent event) { |
| 626 | final int pointerCount = event.getPointerCount(); |
| 627 | if (pointerCount != 1) { |
| 628 | problem("Pointer count is " + pointerCount + " but it should always be 1 for " |
| 629 | + MotionEvent.actionToString(event.getAction())); |
| 630 | } |
| 631 | } |
| 632 | |
Michael Wright | 5bd69e6 | 2015-05-14 14:48:08 +0100 | [diff] [blame] | 633 | private void ensureActionButtonIsNonZeroForThisAction(MotionEvent event) { |
| 634 | final int actionButton = event.getActionButton(); |
| 635 | if (actionButton == 0) { |
| 636 | problem("No action button set. Action button should always be non-zero for " + |
| 637 | MotionEvent.actionToString(event.getAction())); |
| 638 | |
| 639 | } |
| 640 | } |
| 641 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 642 | private void ensureHistorySizeIsZeroForThisAction(MotionEvent event) { |
| 643 | final int historySize = event.getHistorySize(); |
| 644 | if (historySize != 0) { |
| 645 | problem("History size is " + historySize + " but it should always be 0 for " |
| 646 | + MotionEvent.actionToString(event.getAction())); |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | private boolean startEvent(InputEvent event, int nestingLevel, String eventType) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 651 | // Ignore the event if we already checked it at a higher nesting level. |
Jeff Brown | 32cbc3855 | 2011-12-01 14:01:49 -0800 | [diff] [blame] | 652 | final int seq = event.getSequenceNumber(); |
| 653 | if (seq == mLastEventSeq && nestingLevel < mLastNestingLevel |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 654 | && eventType == mLastEventType) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 655 | return false; |
| 656 | } |
| 657 | |
| 658 | if (nestingLevel > 0) { |
Jeff Brown | 32cbc3855 | 2011-12-01 14:01:49 -0800 | [diff] [blame] | 659 | mLastEventSeq = seq; |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 660 | mLastEventType = eventType; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 661 | mLastNestingLevel = nestingLevel; |
| 662 | } else { |
Jeff Brown | 32cbc3855 | 2011-12-01 14:01:49 -0800 | [diff] [blame] | 663 | mLastEventSeq = -1; |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 664 | mLastEventType = null; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 665 | mLastNestingLevel = 0; |
| 666 | } |
| 667 | |
| 668 | mCurrentEvent = event; |
| 669 | mCurrentEventType = eventType; |
| 670 | return true; |
| 671 | } |
| 672 | |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 673 | private void finishEvent() { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 674 | if (mViolationMessage != null && mViolationMessage.length() != 0) { |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 675 | if (!mCurrentEvent.isTainted()) { |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 676 | // Write a log message only if the event was not already tainted. |
| 677 | mViolationMessage.append("\n in ").append(mCaller); |
| 678 | mViolationMessage.append("\n "); |
| 679 | appendEvent(mViolationMessage, 0, mCurrentEvent, false); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 680 | |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 681 | if (RECENT_EVENTS_TO_LOG != 0 && mRecentEvents != null) { |
| 682 | mViolationMessage.append("\n -- recent events --"); |
| 683 | for (int i = 0; i < RECENT_EVENTS_TO_LOG; i++) { |
| 684 | final int index = (mMostRecentEventIndex + RECENT_EVENTS_TO_LOG - i) |
| 685 | % RECENT_EVENTS_TO_LOG; |
| 686 | final InputEvent event = mRecentEvents[index]; |
| 687 | if (event == null) { |
| 688 | break; |
| 689 | } |
| 690 | mViolationMessage.append("\n "); |
| 691 | appendEvent(mViolationMessage, i + 1, event, mRecentEventsUnhandled[index]); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 692 | } |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 693 | } |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 694 | |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 695 | Log.d(mLogTag, mViolationMessage.toString()); |
Jeff Brown | 8134681 | 2011-06-28 20:08:48 -0700 | [diff] [blame] | 696 | |
| 697 | // Taint the event so that we do not generate additional violations from it |
| 698 | // further downstream. |
| 699 | mCurrentEvent.setTainted(true); |
Jeff Brown | 738e7e4 | 2011-06-20 16:35:19 -0700 | [diff] [blame] | 700 | } |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 701 | mViolationMessage.setLength(0); |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 702 | } |
| 703 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 704 | if (RECENT_EVENTS_TO_LOG != 0) { |
| 705 | if (mRecentEvents == null) { |
| 706 | mRecentEvents = new InputEvent[RECENT_EVENTS_TO_LOG]; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 707 | mRecentEventsUnhandled = new boolean[RECENT_EVENTS_TO_LOG]; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 708 | } |
| 709 | final int index = (mMostRecentEventIndex + 1) % RECENT_EVENTS_TO_LOG; |
| 710 | mMostRecentEventIndex = index; |
| 711 | if (mRecentEvents[index] != null) { |
| 712 | mRecentEvents[index].recycle(); |
| 713 | } |
| 714 | mRecentEvents[index] = mCurrentEvent.copy(); |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 715 | mRecentEventsUnhandled[index] = false; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | mCurrentEvent = null; |
| 719 | mCurrentEventType = null; |
| 720 | } |
| 721 | |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 722 | private static void appendEvent(StringBuilder message, int index, |
| 723 | InputEvent event, boolean unhandled) { |
| 724 | message.append(index).append(": sent at ").append(event.getEventTimeNano()); |
| 725 | message.append(", "); |
| 726 | if (unhandled) { |
| 727 | message.append("(unhandled) "); |
| 728 | } |
| 729 | message.append(event); |
| 730 | } |
| 731 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 732 | private void problem(String message) { |
| 733 | if (mViolationMessage == null) { |
| 734 | mViolationMessage = new StringBuilder(); |
| 735 | } |
| 736 | if (mViolationMessage.length() == 0) { |
| 737 | mViolationMessage.append(mCurrentEventType).append(": "); |
| 738 | } else { |
| 739 | mViolationMessage.append("\n "); |
| 740 | } |
| 741 | mViolationMessage.append(message); |
| 742 | } |
| 743 | |
| 744 | private KeyState findKeyState(int deviceId, int source, int keyCode, boolean remove) { |
| 745 | KeyState last = null; |
| 746 | KeyState state = mKeyStateList; |
| 747 | while (state != null) { |
| 748 | if (state.deviceId == deviceId && state.source == source |
| 749 | && state.keyCode == keyCode) { |
| 750 | if (remove) { |
| 751 | if (last != null) { |
| 752 | last.next = state.next; |
| 753 | } else { |
| 754 | mKeyStateList = state.next; |
| 755 | } |
| 756 | state.next = null; |
| 757 | } |
| 758 | return state; |
| 759 | } |
| 760 | last = state; |
| 761 | state = state.next; |
| 762 | } |
| 763 | return null; |
| 764 | } |
| 765 | |
| 766 | private void addKeyState(int deviceId, int source, int keyCode) { |
| 767 | KeyState state = KeyState.obtain(deviceId, source, keyCode); |
| 768 | state.next = mKeyStateList; |
| 769 | mKeyStateList = state; |
| 770 | } |
| 771 | |
| 772 | private static final class KeyState { |
| 773 | private static Object mRecycledListLock = new Object(); |
| 774 | private static KeyState mRecycledList; |
| 775 | |
| 776 | public KeyState next; |
| 777 | public int deviceId; |
| 778 | public int source; |
| 779 | public int keyCode; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 780 | public boolean unhandled; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 781 | |
| 782 | private KeyState() { |
| 783 | } |
| 784 | |
| 785 | public static KeyState obtain(int deviceId, int source, int keyCode) { |
| 786 | KeyState state; |
| 787 | synchronized (mRecycledListLock) { |
| 788 | state = mRecycledList; |
| 789 | if (state != null) { |
| 790 | mRecycledList = state.next; |
| 791 | } else { |
| 792 | state = new KeyState(); |
| 793 | } |
| 794 | } |
| 795 | state.deviceId = deviceId; |
| 796 | state.source = source; |
| 797 | state.keyCode = keyCode; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 798 | state.unhandled = false; |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 799 | return state; |
| 800 | } |
| 801 | |
| 802 | public void recycle() { |
| 803 | synchronized (mRecycledListLock) { |
| 804 | next = mRecycledList; |
| 805 | mRecycledList = next; |
| 806 | } |
| 807 | } |
| 808 | } |
| 809 | } |