Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [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 | |
| 17 | package android.accessibilityservice; |
| 18 | |
| 19 | import android.annotation.IntRange; |
| 20 | import android.annotation.NonNull; |
| 21 | import android.graphics.Matrix; |
| 22 | import android.graphics.Path; |
| 23 | import android.graphics.PathMeasure; |
| 24 | import android.graphics.RectF; |
| 25 | import android.view.InputDevice; |
| 26 | import android.view.MotionEvent; |
| 27 | import android.view.MotionEvent.PointerCoords; |
| 28 | import android.view.MotionEvent.PointerProperties; |
| 29 | import android.view.ViewConfiguration; |
| 30 | |
| 31 | import java.util.ArrayList; |
| 32 | import java.util.Arrays; |
| 33 | import java.util.List; |
| 34 | |
| 35 | /** |
| 36 | * Accessibility services with the |
| 37 | * {@link android.R.styleable#AccessibilityService_canPerformGestures} property can dispatch |
| 38 | * gestures. This class describes those gestures. Gestures are made up of one or more strokes. |
Phil Weaver | 8313881 | 2016-03-29 18:15:28 -0700 | [diff] [blame] | 39 | * Gestures are immutable once built. |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 40 | * <p> |
| 41 | * Spatial dimensions throughout are in screen pixels. Time is measured in milliseconds. |
| 42 | */ |
| 43 | public final class GestureDescription { |
| 44 | /** Gestures may contain no more than this many strokes */ |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 45 | private static final int MAX_STROKE_COUNT = 10; |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 46 | |
| 47 | /** |
| 48 | * Upper bound on total gesture duration. Nearly all gestures will be much shorter. |
| 49 | */ |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 50 | private static final long MAX_GESTURE_DURATION_MS = 60 * 1000; |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 51 | |
| 52 | private final List<StrokeDescription> mStrokes = new ArrayList<>(); |
| 53 | private final float[] mTempPos = new float[2]; |
| 54 | |
| 55 | /** |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 56 | * Get the upper limit for the number of strokes a gesture may contain. |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 57 | * |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 58 | * @return The maximum number of strokes. |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 59 | */ |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 60 | public static int getMaxStrokeCount() { |
| 61 | return MAX_STROKE_COUNT; |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | /** |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 65 | * Get the upper limit on a gesture's duration. |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 66 | * |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 67 | * @return The maximum duration in milliseconds. |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 68 | */ |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 69 | public static long getMaxGestureDuration() { |
| 70 | return MAX_GESTURE_DURATION_MS; |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | private GestureDescription() {} |
| 74 | |
| 75 | private GestureDescription(List<StrokeDescription> strokes) { |
| 76 | mStrokes.addAll(strokes); |
| 77 | } |
| 78 | |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 79 | /** |
| 80 | * Get the number of stroke in the gesture. |
| 81 | * |
| 82 | * @return the number of strokes in this gesture |
| 83 | */ |
| 84 | public int getStrokeCount() { |
| 85 | return mStrokes.size(); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Read a stroke from the gesture |
| 90 | * |
| 91 | * @param index the index of the stroke |
| 92 | * |
| 93 | * @return A description of the stroke. |
| 94 | */ |
| 95 | public StrokeDescription getStroke(@IntRange(from = 0) int index) { |
| 96 | return mStrokes.get(index); |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Return the smallest key point (where a path starts or ends) that is at least a specified |
| 101 | * offset |
| 102 | * @param offset the minimum start time |
| 103 | * @return The next key time that is at least the offset or -1 if one can't be found |
| 104 | */ |
| 105 | private long getNextKeyPointAtLeast(long offset) { |
| 106 | long nextKeyPoint = Long.MAX_VALUE; |
| 107 | for (int i = 0; i < mStrokes.size(); i++) { |
| 108 | long thisStartTime = mStrokes.get(i).mStartTime; |
| 109 | if ((thisStartTime < nextKeyPoint) && (thisStartTime >= offset)) { |
| 110 | nextKeyPoint = thisStartTime; |
| 111 | } |
| 112 | long thisEndTime = mStrokes.get(i).mEndTime; |
| 113 | if ((thisEndTime < nextKeyPoint) && (thisEndTime >= offset)) { |
| 114 | nextKeyPoint = thisEndTime; |
| 115 | } |
| 116 | } |
| 117 | return (nextKeyPoint == Long.MAX_VALUE) ? -1L : nextKeyPoint; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Get the points that correspond to a particular moment in time. |
| 122 | * @param time The time of interest |
| 123 | * @param touchPoints An array to hold the current touch points. Must be preallocated to at |
| 124 | * least the number of paths in the gesture to prevent going out of bounds |
| 125 | * @return The number of points found, and thus the number of elements set in each array |
| 126 | */ |
| 127 | private int getPointsForTime(long time, TouchPoint[] touchPoints) { |
| 128 | int numPointsFound = 0; |
| 129 | for (int i = 0; i < mStrokes.size(); i++) { |
| 130 | StrokeDescription strokeDescription = mStrokes.get(i); |
| 131 | if (strokeDescription.hasPointForTime(time)) { |
| 132 | touchPoints[numPointsFound].mPathIndex = i; |
| 133 | touchPoints[numPointsFound].mIsStartOfPath = (time == strokeDescription.mStartTime); |
| 134 | touchPoints[numPointsFound].mIsEndOfPath = (time == strokeDescription.mEndTime); |
| 135 | strokeDescription.getPosForTime(time, mTempPos); |
| 136 | touchPoints[numPointsFound].mX = Math.round(mTempPos[0]); |
| 137 | touchPoints[numPointsFound].mY = Math.round(mTempPos[1]); |
| 138 | numPointsFound++; |
| 139 | } |
| 140 | } |
| 141 | return numPointsFound; |
| 142 | } |
| 143 | |
| 144 | // Total duration assumes that the gesture starts at 0; waiting around to start a gesture |
| 145 | // counts against total duration |
| 146 | private static long getTotalDuration(List<StrokeDescription> paths) { |
| 147 | long latestEnd = Long.MIN_VALUE; |
| 148 | for (int i = 0; i < paths.size(); i++) { |
| 149 | StrokeDescription path = paths.get(i); |
| 150 | latestEnd = Math.max(latestEnd, path.mEndTime); |
| 151 | } |
| 152 | return Math.max(latestEnd, 0); |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Builder for a {@code GestureDescription} |
| 157 | */ |
| 158 | public static class Builder { |
| 159 | |
| 160 | private final List<StrokeDescription> mStrokes = new ArrayList<>(); |
| 161 | |
| 162 | /** |
| 163 | * Add a stroke to the gesture description. Up to {@code MAX_STROKE_COUNT} paths may be |
| 164 | * added to a gesture, and the total gesture duration (earliest path start time to latest path |
| 165 | * end time) may not exceed {@code MAX_GESTURE_DURATION_MS}. |
| 166 | * |
| 167 | * @param strokeDescription the stroke to add. |
| 168 | * |
| 169 | * @return this |
| 170 | */ |
| 171 | public Builder addStroke(@NonNull StrokeDescription strokeDescription) { |
| 172 | if (mStrokes.size() >= MAX_STROKE_COUNT) { |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 173 | throw new IllegalStateException( |
| 174 | "Attempting to add too many strokes to a gesture"); |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | mStrokes.add(strokeDescription); |
| 178 | |
| 179 | if (getTotalDuration(mStrokes) > MAX_GESTURE_DURATION_MS) { |
| 180 | mStrokes.remove(strokeDescription); |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 181 | throw new IllegalStateException( |
| 182 | "Gesture would exceed maximum duration with new stroke"); |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 183 | } |
| 184 | return this; |
| 185 | } |
| 186 | |
| 187 | public GestureDescription build() { |
| 188 | if (mStrokes.size() == 0) { |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 189 | throw new IllegalStateException("Gestures must have at least one stroke"); |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 190 | } |
| 191 | return new GestureDescription(mStrokes); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Immutable description of stroke that can be part of a gesture. |
| 197 | */ |
| 198 | public static class StrokeDescription { |
| 199 | Path mPath; |
| 200 | long mStartTime; |
| 201 | long mEndTime; |
| 202 | private float mTimeToLengthConversion; |
| 203 | private PathMeasure mPathMeasure; |
| 204 | |
| 205 | /** |
| 206 | * @param path The path to follow. Must have exactly one contour, and that contour must |
| 207 | * have nonzero length. The bounds of the path must not be negative. |
| 208 | * @param startTime The time, in milliseconds, from the time the gesture starts to the |
| 209 | * time the stroke should start. Must not be negative. |
| 210 | * @param duration The duration, in milliseconds, the stroke takes to traverse the path. |
| 211 | * Must not be negative. |
| 212 | */ |
| 213 | public StrokeDescription(@NonNull Path path, |
Phil Weaver | 4503fcf | 2016-03-08 16:29:44 -0800 | [diff] [blame] | 214 | @IntRange(from = 0) long startTime, |
| 215 | @IntRange(from = 0) long duration) { |
Phil Weaver | a6b64f5 | 2015-12-04 15:21:35 -0800 | [diff] [blame] | 216 | if (duration <= 0) { |
| 217 | throw new IllegalArgumentException("Duration must be positive"); |
| 218 | } |
| 219 | if (startTime < 0) { |
| 220 | throw new IllegalArgumentException("Start time must not be negative"); |
| 221 | } |
| 222 | RectF bounds = new RectF(); |
| 223 | path.computeBounds(bounds, false /* unused */); |
| 224 | if ((bounds.bottom < 0) || (bounds.top < 0) || (bounds.right < 0) |
| 225 | || (bounds.left < 0)) { |
| 226 | throw new IllegalArgumentException("Path bounds must not be negative"); |
| 227 | } |
| 228 | mPath = new Path(path); |
| 229 | mPathMeasure = new PathMeasure(path, false); |
| 230 | if (mPathMeasure.getLength() == 0) { |
| 231 | throw new IllegalArgumentException("Path has zero length"); |
| 232 | } |
| 233 | if (mPathMeasure.nextContour()) { |
| 234 | throw new IllegalArgumentException("Path has more than one contour"); |
| 235 | } |
| 236 | /* |
| 237 | * Calling nextContour has moved mPathMeasure off the first contour, which is the only |
| 238 | * one we care about. Set the path again to go back to the first contour. |
| 239 | */ |
| 240 | mPathMeasure.setPath(path, false); |
| 241 | mStartTime = startTime; |
| 242 | mEndTime = startTime + duration; |
| 243 | if (duration > 0) { |
| 244 | mTimeToLengthConversion = getLength() / duration; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Retrieve a copy of the path for this stroke |
| 250 | * |
| 251 | * @return A copy of the path |
| 252 | */ |
| 253 | public Path getPath() { |
| 254 | return new Path(mPath); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Get the stroke's start time |
| 259 | * |
| 260 | * @return the start time for this stroke. |
| 261 | */ |
| 262 | public long getStartTime() { |
| 263 | return mStartTime; |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Get the stroke's duration |
| 268 | * |
| 269 | * @return the duration for this stroke |
| 270 | */ |
| 271 | public long getDuration() { |
| 272 | return mEndTime - mStartTime; |
| 273 | } |
| 274 | |
| 275 | float getLength() { |
| 276 | return mPathMeasure.getLength(); |
| 277 | } |
| 278 | |
| 279 | /* Assumes hasPointForTime returns true */ |
| 280 | boolean getPosForTime(long time, float[] pos) { |
| 281 | if (time == mEndTime) { |
| 282 | // Close to the end time, roundoff can be a problem |
| 283 | return mPathMeasure.getPosTan(getLength(), pos, null); |
| 284 | } |
| 285 | float length = mTimeToLengthConversion * ((float) (time - mStartTime)); |
| 286 | return mPathMeasure.getPosTan(length, pos, null); |
| 287 | } |
| 288 | |
| 289 | boolean hasPointForTime(long time) { |
| 290 | return ((time >= mStartTime) && (time <= mEndTime)); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | private static class TouchPoint { |
| 295 | int mPathIndex; |
| 296 | boolean mIsStartOfPath; |
| 297 | boolean mIsEndOfPath; |
| 298 | float mX; |
| 299 | float mY; |
| 300 | |
| 301 | void copyFrom(TouchPoint other) { |
| 302 | mPathIndex = other.mPathIndex; |
| 303 | mIsStartOfPath = other.mIsStartOfPath; |
| 304 | mIsEndOfPath = other.mIsEndOfPath; |
| 305 | mX = other.mX; |
| 306 | mY = other.mY; |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * Class to convert a GestureDescription to a series of MotionEvents. |
| 312 | */ |
| 313 | static class MotionEventGenerator { |
| 314 | /** |
| 315 | * Constants used to initialize all MotionEvents |
| 316 | */ |
| 317 | private static final int EVENT_META_STATE = 0; |
| 318 | private static final int EVENT_BUTTON_STATE = 0; |
| 319 | private static final int EVENT_DEVICE_ID = 0; |
| 320 | private static final int EVENT_EDGE_FLAGS = 0; |
| 321 | private static final int EVENT_SOURCE = InputDevice.SOURCE_TOUCHSCREEN; |
| 322 | private static final int EVENT_FLAGS = 0; |
| 323 | private static final float EVENT_X_PRECISION = 1; |
| 324 | private static final float EVENT_Y_PRECISION = 1; |
| 325 | |
| 326 | /* Lazily-created scratch memory for processing touches */ |
| 327 | private static TouchPoint[] sCurrentTouchPoints; |
| 328 | private static TouchPoint[] sLastTouchPoints; |
| 329 | private static PointerCoords[] sPointerCoords; |
| 330 | private static PointerProperties[] sPointerProps; |
| 331 | |
| 332 | static List<MotionEvent> getMotionEventsFromGestureDescription( |
| 333 | GestureDescription description, int sampleTimeMs) { |
| 334 | final List<MotionEvent> motionEvents = new ArrayList<>(); |
| 335 | |
| 336 | // Point data at each time we generate an event for |
| 337 | final TouchPoint[] currentTouchPoints = |
| 338 | getCurrentTouchPoints(description.getStrokeCount()); |
| 339 | // Point data sent in last touch event |
| 340 | int lastTouchPointSize = 0; |
| 341 | final TouchPoint[] lastTouchPoints = |
| 342 | getLastTouchPoints(description.getStrokeCount()); |
| 343 | |
| 344 | /* Loop through each time slice where there are touch points */ |
| 345 | long timeSinceGestureStart = 0; |
| 346 | long nextKeyPointTime = description.getNextKeyPointAtLeast(timeSinceGestureStart); |
| 347 | while (nextKeyPointTime >= 0) { |
| 348 | timeSinceGestureStart = (lastTouchPointSize == 0) ? nextKeyPointTime |
| 349 | : Math.min(nextKeyPointTime, timeSinceGestureStart + sampleTimeMs); |
| 350 | int currentTouchPointSize = description.getPointsForTime(timeSinceGestureStart, |
| 351 | currentTouchPoints); |
| 352 | |
| 353 | appendMoveEventIfNeeded(motionEvents, lastTouchPoints, lastTouchPointSize, |
| 354 | currentTouchPoints, currentTouchPointSize, timeSinceGestureStart); |
| 355 | lastTouchPointSize = appendUpEvents(motionEvents, lastTouchPoints, |
| 356 | lastTouchPointSize, currentTouchPoints, currentTouchPointSize, |
| 357 | timeSinceGestureStart); |
| 358 | lastTouchPointSize = appendDownEvents(motionEvents, lastTouchPoints, |
| 359 | lastTouchPointSize, currentTouchPoints, currentTouchPointSize, |
| 360 | timeSinceGestureStart); |
| 361 | |
| 362 | /* Move to next time slice */ |
| 363 | nextKeyPointTime = description.getNextKeyPointAtLeast(timeSinceGestureStart + 1); |
| 364 | } |
| 365 | return motionEvents; |
| 366 | } |
| 367 | |
| 368 | private static TouchPoint[] getCurrentTouchPoints(int requiredCapacity) { |
| 369 | if ((sCurrentTouchPoints == null) || (sCurrentTouchPoints.length < requiredCapacity)) { |
| 370 | sCurrentTouchPoints = new TouchPoint[requiredCapacity]; |
| 371 | for (int i = 0; i < requiredCapacity; i++) { |
| 372 | sCurrentTouchPoints[i] = new TouchPoint(); |
| 373 | } |
| 374 | } |
| 375 | return sCurrentTouchPoints; |
| 376 | } |
| 377 | |
| 378 | private static TouchPoint[] getLastTouchPoints(int requiredCapacity) { |
| 379 | if ((sLastTouchPoints == null) || (sLastTouchPoints.length < requiredCapacity)) { |
| 380 | sLastTouchPoints = new TouchPoint[requiredCapacity]; |
| 381 | for (int i = 0; i < requiredCapacity; i++) { |
| 382 | sLastTouchPoints[i] = new TouchPoint(); |
| 383 | } |
| 384 | } |
| 385 | return sLastTouchPoints; |
| 386 | } |
| 387 | |
| 388 | private static PointerCoords[] getPointerCoords(int requiredCapacity) { |
| 389 | if ((sPointerCoords == null) || (sPointerCoords.length < requiredCapacity)) { |
| 390 | sPointerCoords = new PointerCoords[requiredCapacity]; |
| 391 | for (int i = 0; i < requiredCapacity; i++) { |
| 392 | sPointerCoords[i] = new PointerCoords(); |
| 393 | } |
| 394 | } |
| 395 | return sPointerCoords; |
| 396 | } |
| 397 | |
| 398 | private static PointerProperties[] getPointerProps(int requiredCapacity) { |
| 399 | if ((sPointerProps == null) || (sPointerProps.length < requiredCapacity)) { |
| 400 | sPointerProps = new PointerProperties[requiredCapacity]; |
| 401 | for (int i = 0; i < requiredCapacity; i++) { |
| 402 | sPointerProps[i] = new PointerProperties(); |
| 403 | } |
| 404 | } |
| 405 | return sPointerProps; |
| 406 | } |
| 407 | |
| 408 | private static void appendMoveEventIfNeeded(List<MotionEvent> motionEvents, |
| 409 | TouchPoint[] lastTouchPoints, int lastTouchPointsSize, |
| 410 | TouchPoint[] currentTouchPoints, int currentTouchPointsSize, long currentTime) { |
| 411 | /* Look for pointers that have moved */ |
| 412 | boolean moveFound = false; |
| 413 | for (int i = 0; i < currentTouchPointsSize; i++) { |
| 414 | int lastPointsIndex = findPointByPathIndex(lastTouchPoints, lastTouchPointsSize, |
| 415 | currentTouchPoints[i].mPathIndex); |
| 416 | if (lastPointsIndex >= 0) { |
| 417 | moveFound |= (lastTouchPoints[lastPointsIndex].mX != currentTouchPoints[i].mX) |
| 418 | || (lastTouchPoints[lastPointsIndex].mY != currentTouchPoints[i].mY); |
| 419 | lastTouchPoints[lastPointsIndex].copyFrom(currentTouchPoints[i]); |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | if (moveFound) { |
| 424 | long downTime = motionEvents.get(motionEvents.size() - 1).getDownTime(); |
| 425 | motionEvents.add(obtainMotionEvent(downTime, currentTime, MotionEvent.ACTION_MOVE, |
| 426 | lastTouchPoints, lastTouchPointsSize)); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | private static int appendUpEvents(List<MotionEvent> motionEvents, |
| 431 | TouchPoint[] lastTouchPoints, int lastTouchPointsSize, |
| 432 | TouchPoint[] currentTouchPoints, int currentTouchPointsSize, long currentTime) { |
| 433 | /* Look for a pointer at the end of its path */ |
| 434 | for (int i = 0; i < currentTouchPointsSize; i++) { |
| 435 | if (currentTouchPoints[i].mIsEndOfPath) { |
| 436 | int indexOfUpEvent = findPointByPathIndex(lastTouchPoints, lastTouchPointsSize, |
| 437 | currentTouchPoints[i].mPathIndex); |
| 438 | if (indexOfUpEvent < 0) { |
| 439 | continue; // Should not happen |
| 440 | } |
| 441 | long downTime = motionEvents.get(motionEvents.size() - 1).getDownTime(); |
| 442 | int action = (lastTouchPointsSize == 1) ? MotionEvent.ACTION_UP |
| 443 | : MotionEvent.ACTION_POINTER_UP; |
| 444 | action |= indexOfUpEvent << MotionEvent.ACTION_POINTER_INDEX_SHIFT; |
| 445 | motionEvents.add(obtainMotionEvent(downTime, currentTime, action, |
| 446 | lastTouchPoints, lastTouchPointsSize)); |
| 447 | /* Remove this point from lastTouchPoints */ |
| 448 | for (int j = indexOfUpEvent; j < lastTouchPointsSize - 1; j++) { |
| 449 | lastTouchPoints[j].copyFrom(lastTouchPoints[j+1]); |
| 450 | } |
| 451 | lastTouchPointsSize--; |
| 452 | } |
| 453 | } |
| 454 | return lastTouchPointsSize; |
| 455 | } |
| 456 | |
| 457 | private static int appendDownEvents(List<MotionEvent> motionEvents, |
| 458 | TouchPoint[] lastTouchPoints, int lastTouchPointsSize, |
| 459 | TouchPoint[] currentTouchPoints, int currentTouchPointsSize, long currentTime) { |
| 460 | /* Look for a pointer that is just starting */ |
| 461 | for (int i = 0; i < currentTouchPointsSize; i++) { |
| 462 | if (currentTouchPoints[i].mIsStartOfPath) { |
| 463 | /* Add the point to last coords and use the new array to generate the event */ |
| 464 | lastTouchPoints[lastTouchPointsSize++].copyFrom(currentTouchPoints[i]); |
| 465 | int action = (lastTouchPointsSize == 1) ? MotionEvent.ACTION_DOWN |
| 466 | : MotionEvent.ACTION_POINTER_DOWN; |
| 467 | long downTime = (action == MotionEvent.ACTION_DOWN) ? currentTime : |
| 468 | motionEvents.get(motionEvents.size() - 1).getDownTime(); |
| 469 | action |= i << MotionEvent.ACTION_POINTER_INDEX_SHIFT; |
| 470 | motionEvents.add(obtainMotionEvent(downTime, currentTime, action, |
| 471 | lastTouchPoints, lastTouchPointsSize)); |
| 472 | } |
| 473 | } |
| 474 | return lastTouchPointsSize; |
| 475 | } |
| 476 | |
| 477 | private static MotionEvent obtainMotionEvent(long downTime, long eventTime, int action, |
| 478 | TouchPoint[] touchPoints, int touchPointsSize) { |
| 479 | PointerCoords[] pointerCoords = getPointerCoords(touchPointsSize); |
| 480 | PointerProperties[] pointerProperties = getPointerProps(touchPointsSize); |
| 481 | for (int i = 0; i < touchPointsSize; i++) { |
| 482 | pointerProperties[i].id = touchPoints[i].mPathIndex; |
| 483 | pointerProperties[i].toolType = MotionEvent.TOOL_TYPE_UNKNOWN; |
| 484 | pointerCoords[i].clear(); |
| 485 | pointerCoords[i].pressure = 1.0f; |
| 486 | pointerCoords[i].size = 1.0f; |
| 487 | pointerCoords[i].x = touchPoints[i].mX; |
| 488 | pointerCoords[i].y = touchPoints[i].mY; |
| 489 | } |
| 490 | return MotionEvent.obtain(downTime, eventTime, action, touchPointsSize, |
| 491 | pointerProperties, pointerCoords, EVENT_META_STATE, EVENT_BUTTON_STATE, |
| 492 | EVENT_X_PRECISION, EVENT_Y_PRECISION, EVENT_DEVICE_ID, EVENT_EDGE_FLAGS, |
| 493 | EVENT_SOURCE, EVENT_FLAGS); |
| 494 | } |
| 495 | |
| 496 | private static int findPointByPathIndex(TouchPoint[] touchPoints, int touchPointsSize, |
| 497 | int pathIndex) { |
| 498 | for (int i = 0; i < touchPointsSize; i++) { |
| 499 | if (touchPoints[i].mPathIndex == pathIndex) { |
| 500 | return i; |
| 501 | } |
| 502 | } |
| 503 | return -1; |
| 504 | } |
| 505 | } |
| 506 | } |