| 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | package org.chromium.content.browser; |
| 6 | |
| 7 | import android.content.Context; |
| 8 | import android.os.Bundle; |
| 9 | import android.os.Handler; |
| 10 | import android.os.SystemClock; |
| 11 | import android.util.Log; |
| 12 | import android.view.MotionEvent; |
| 13 | import android.view.ViewConfiguration; |
| 14 | |
| 15 | import org.chromium.content.browser.third_party.GestureDetector; |
| 16 | import org.chromium.content.browser.third_party.GestureDetector.OnGestureListener; |
| 17 | import org.chromium.content.browser.LongPressDetector.LongPressDelegate; |
| 18 | import org.chromium.content.browser.SnapScrollController; |
| 19 | import org.chromium.content.common.TraceEvent; |
| 20 | |
| 21 | import java.util.ArrayDeque; |
| 22 | import java.util.Deque; |
| 23 | |
| 24 | /** |
| 25 | * This class handles all MotionEvent handling done in ContentViewCore including the gesture |
| 26 | * recognition. It sends all related native calls through the interface MotionEventDelegate. |
| 27 | */ |
| 28 | class ContentViewGestureHandler implements LongPressDelegate { |
| 29 | |
| 30 | private static final String TAG = "ContentViewGestureHandler"; |
| 31 | /** |
| 32 | * Used for GESTURE_FLING_START x velocity |
| 33 | */ |
| 34 | static final String VELOCITY_X = "Velocity X"; |
| 35 | /** |
| 36 | * Used for GESTURE_FLING_START y velocity |
| 37 | */ |
| 38 | static final String VELOCITY_Y = "Velocity Y"; |
| 39 | /** |
| 40 | * Used for GESTURE_SCROLL_BY x distance |
| 41 | */ |
| 42 | static final String DISTANCE_X = "Distance X"; |
| 43 | /** |
| 44 | * Used for GESTURE_SCROLL_BY y distance |
| 45 | */ |
| 46 | static final String DISTANCE_Y = "Distance Y"; |
| 47 | /** |
| 48 | * Used in GESTURE_SINGLE_TAP_CONFIRMED to check whether ShowPress has been called before. |
| 49 | */ |
| 50 | static final String SHOW_PRESS = "ShowPress"; |
| 51 | /** |
| 52 | * Used for GESTURE_PINCH_BY delta |
| 53 | */ |
| 54 | static final String DELTA = "Delta"; |
| 55 | |
| 56 | private final Bundle mExtraParamBundle; |
| 57 | private GestureDetector mGestureDetector; |
| 58 | private final ZoomManager mZoomManager; |
| 59 | private LongPressDetector mLongPressDetector; |
| 60 | private OnGestureListener mListener; |
| 61 | private MotionEvent mCurrentDownEvent; |
| 62 | private final MotionEventDelegate mMotionEventDelegate; |
| 63 | |
| 64 | // Queue of motion events. |
| 65 | private final Deque<MotionEvent> mPendingMotionEvents = new ArrayDeque<MotionEvent>(); |
| 66 | |
| 67 | // Has WebKit told us the current page requires touch events. |
| 68 | private boolean mHasTouchHandlers = false; |
| 69 | |
| 70 | // True if the down event for the current gesture was returned back to the browser with |
| 71 | // INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS |
| 72 | private boolean mNoTouchHandlerForGesture = false; |
| 73 | |
| 74 | // True if JavaScript touch event handlers returned an ACK with |
| 75 | // INPUT_EVENT_ACK_STATE_CONSUMED. In this case we should avoid, sending events from |
| 76 | // this gesture to the Gesture Detector since it will have already missed at least |
| 77 | // one event. |
| 78 | private boolean mJavaScriptIsConsumingGesture = false; |
| 79 | |
| 80 | // Remember whether onShowPress() is called. If it is not, in onSingleTapConfirmed() |
| 81 | // we will first show the press state, then trigger the click. |
| 82 | private boolean mShowPressIsCalled; |
| 83 | |
| 84 | // This flag is used for ignoring the remaining touch events, i.e., All the events until the |
| 85 | // next ACTION_DOWN. This is automatically set to false on the next ACTION_DOWN. |
| 86 | private boolean mIgnoreRemainingTouchEvents; |
| 87 | |
| 88 | // TODO(klobag): this is to avoid a bug in GestureDetector. With multi-touch, |
| 89 | // mAlwaysInTapRegion is not reset. So when the last finger is up, onSingleTapUp() |
| 90 | // will be mistakenly fired. |
| 91 | private boolean mIgnoreSingleTap; |
| 92 | |
| 93 | // True from right before we send the first scroll event until the last finger is raised. |
| 94 | private boolean mTouchScrolling; |
| 95 | |
| 96 | // TODO(wangxianzhu): For now it is true after a fling is started until the next |
| 97 | // touch. Should reset it to false on end of fling if the UI is able to know when the |
| 98 | // fling ends. |
| 99 | private boolean mFlingMayBeActive; |
| 100 | |
| 101 | private boolean mSeenFirstScrollEvent; |
| 102 | |
| 103 | private boolean mPinchInProgress = false; |
| 104 | |
| 105 | // Tracks whether a touch cancel event has been sent as a result of switching |
| 106 | // into scrolling or pinching mode. |
| 107 | private boolean mTouchCancelEventSent = false; |
| 108 | |
| 109 | // Last cancelled touch event as a result of scrolling or pinching. |
| 110 | private MotionEvent mLastCancelledEvent = null; |
| 111 | |
| 112 | private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout(); |
| 113 | |
| 114 | //On single tap this will store the x, y coordinates of the touch. |
| 115 | private int mSingleTapX; |
| 116 | private int mSingleTapY; |
| 117 | |
| 118 | // Indicate current double tap drag mode state. |
| 119 | private int mDoubleTapDragMode = DOUBLE_TAP_DRAG_MODE_NONE; |
| 120 | |
| 121 | // x, y coordinates for an Anchor on double tap drag zoom. |
| 122 | private float mDoubleTapDragZoomAnchorX; |
| 123 | private float mDoubleTapDragZoomAnchorY; |
| 124 | |
| 125 | // On double tap this will store the y coordinates of the touch. |
| 126 | private float mDoubleTapY; |
| 127 | |
| 128 | // Double tap drag zoom sensitive (speed). |
| 129 | private static final float DOUBLE_TAP_DRAG_ZOOM_SPEED = 0.005f; |
| 130 | |
| 131 | // Used to track the last rawX/Y coordinates for moves. This gives absolute scroll distance. |
| 132 | // Useful for full screen tracking. |
| 133 | private float mLastRawX = 0; |
| 134 | private float mLastRawY = 0; |
| 135 | |
| 136 | // Cache of square of the scaled touch slop so we don't have to calculate it on every touch. |
| 137 | private int mScaledTouchSlopSquare; |
| 138 | |
| 139 | // Object that keeps track of and updates scroll snapping behavior. |
| 140 | private SnapScrollController mSnapScrollController; |
| 141 | |
| 142 | // Used to track the accumulated scroll error over time. This is used to remove the |
| 143 | // rounding error we introduced by passing integers to webkit. |
| 144 | private float mAccumulatedScrollErrorX = 0; |
| 145 | private float mAccumulatedScrollErrorY = 0; |
| 146 | |
| 147 | // Whether input events are delivered right before vsync. |
| 148 | private final boolean mInputEventsDeliveredAtVSync; |
| 149 | |
| 150 | static final int GESTURE_SHOW_PRESSED_STATE = 0; |
| 151 | static final int GESTURE_DOUBLE_TAP = 1; |
| 152 | static final int GESTURE_SINGLE_TAP_UP = 2; |
| 153 | static final int GESTURE_SINGLE_TAP_CONFIRMED = 3; |
| 154 | static final int GESTURE_SINGLE_TAP_UNCONFIRMED = 4; |
| 155 | static final int GESTURE_LONG_PRESS = 5; |
| 156 | static final int GESTURE_SCROLL_START = 6; |
| 157 | static final int GESTURE_SCROLL_BY = 7; |
| 158 | static final int GESTURE_SCROLL_END = 8; |
| 159 | static final int GESTURE_FLING_START = 9; |
| 160 | static final int GESTURE_FLING_CANCEL = 10; |
| 161 | static final int GESTURE_PINCH_BEGIN = 11; |
| 162 | static final int GESTURE_PINCH_BY = 12; |
| 163 | static final int GESTURE_PINCH_END = 13; |
| 164 | static final int GESTURE_SHOW_PRESS_CANCEL = 14; |
| 165 | static final int GESTURE_LONG_TAP = 15; |
| 166 | |
| 167 | // These have to be kept in sync with content/port/common/input_event_ack_state.h |
| 168 | static final int INPUT_EVENT_ACK_STATE_UNKNOWN = 0; |
| 169 | static final int INPUT_EVENT_ACK_STATE_CONSUMED = 1; |
| 170 | static final int INPUT_EVENT_ACK_STATE_NOT_CONSUMED = 2; |
| 171 | static final int INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS = 3; |
| 172 | |
| 173 | // Return values of sendPendingEventToNative(); |
| 174 | static final int EVENT_FORWARDED_TO_NATIVE = 0; |
| 175 | static final int EVENT_CONVERTED_TO_CANCEL = 1; |
| 176 | static final int EVENT_NOT_FORWARDED = 2; |
| 177 | |
| 178 | private final float mPxToDp; |
| 179 | |
| 180 | static final int DOUBLE_TAP_DRAG_MODE_NONE = 0; |
| 181 | static final int DOUBLE_TAP_DRAG_MODE_DETECTION_IN_PROGRESS = 1; |
| 182 | static final int DOUBLE_TAP_DRAG_MODE_ZOOM = 2; |
| 183 | static final int DOUBLE_TAP_DRAG_MODE_DISABLED = 3; |
| 184 | |
| 185 | private class TouchEventTimeoutHandler implements Runnable { |
| 186 | private static final int TOUCH_EVENT_TIMEOUT = 200; |
| 187 | private static final int PENDING_ACK_NONE = 0; |
| 188 | private static final int PENDING_ACK_ORIGINAL_EVENT = 1; |
| 189 | private static final int PENDING_ACK_CANCEL_EVENT = 2; |
| 190 | |
| 191 | private long mEventTime; |
| 192 | private TouchPoint[] mTouchPoints; |
| 193 | private Handler mHandler = new Handler(); |
| 194 | private int mPendingAckState; |
| 195 | |
| 196 | public void start(long eventTime, TouchPoint[] pts) { |
| 197 | assert mTouchPoints == null; |
| 198 | assert mPendingAckState == PENDING_ACK_NONE; |
| 199 | mEventTime = eventTime; |
| 200 | mTouchPoints = pts; |
| 201 | mHandler.postDelayed(this, TOUCH_EVENT_TIMEOUT); |
| 202 | } |
| 203 | |
| 204 | @Override |
| 205 | public void run() { |
| 206 | TraceEvent.begin("TouchEventTimeout"); |
| 207 | while (!mPendingMotionEvents.isEmpty()) { |
| 208 | MotionEvent nextEvent = mPendingMotionEvents.removeFirst(); |
| 209 | processTouchEvent(nextEvent); |
| 210 | recycleEvent(nextEvent); |
| 211 | } |
| 212 | // We are waiting for 2 ACKs: one for the timed-out event, the other for |
| 213 | // the touchcancel event injected when the timed-out event is ACK'ed. |
| 214 | mPendingAckState = PENDING_ACK_ORIGINAL_EVENT; |
| 215 | TraceEvent.end(); |
| 216 | } |
| 217 | |
| 218 | public boolean hasTimeoutEvent() { |
| 219 | return mPendingAckState != PENDING_ACK_NONE; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * @return Whether the ACK is consumed in this method. |
| 224 | */ |
| 225 | public boolean confirmTouchEvent() { |
| 226 | switch (mPendingAckState) { |
| 227 | case PENDING_ACK_NONE: |
| 228 | // The ACK to the original event is received before timeout. |
| 229 | mHandler.removeCallbacks(this); |
| 230 | mTouchPoints = null; |
| 231 | return false; |
| 232 | case PENDING_ACK_ORIGINAL_EVENT: |
| 233 | TraceEvent.instant("TouchEventTimeout:ConfirmOriginalEvent"); |
| 234 | // The ACK to the original event is received after timeout. |
| 235 | // Inject a touchcancel event. |
| 236 | mPendingAckState = PENDING_ACK_CANCEL_EVENT; |
| 237 | mMotionEventDelegate.sendTouchEvent(mEventTime + TOUCH_EVENT_TIMEOUT, |
| 238 | TouchPoint.TOUCH_EVENT_TYPE_CANCEL, mTouchPoints); |
| 239 | mTouchPoints = null; |
| 240 | return true; |
| 241 | case PENDING_ACK_CANCEL_EVENT: |
| 242 | TraceEvent.instant("TouchEventTimeout:ConfirmCancelEvent"); |
| 243 | // The ACK to the injected touchcancel event is received. |
| 244 | mPendingAckState = PENDING_ACK_NONE; |
| 245 | drainAllPendingEventsUntilNextDown(); |
| 246 | return true; |
| 247 | default: |
| 248 | assert false : "Never reached"; |
| 249 | return false; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | public void mockTimeout() { |
| 254 | assert !hasTimeoutEvent(); |
| 255 | mHandler.removeCallbacks(this); |
| 256 | run(); |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * This is for testing only. |
| 261 | * @return Whether a timeout event has been scheduled but not yet run. |
| 262 | */ |
| 263 | public boolean hasScheduledTimeoutEventForTesting() { |
| 264 | return mTouchPoints != null && mPendingAckState == PENDING_ACK_NONE; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | private TouchEventTimeoutHandler mTouchEventTimeoutHandler = new TouchEventTimeoutHandler(); |
| 269 | |
| 270 | /** |
| 271 | * This is an interface to handle MotionEvent related communication with the native side also |
| 272 | * access some ContentView specific parameters. |
| 273 | */ |
| 274 | public interface MotionEventDelegate { |
| 275 | /** |
| 276 | * Send a raw {@link MotionEvent} to the native side |
| 277 | * @param timeMs Time of the event in ms. |
| 278 | * @param action The action type for the event. |
| 279 | * @param pts The TouchPoint array to be sent for the event. |
| 280 | * @return Whether the event was sent to the native side successfully or not. |
| 281 | */ |
| 282 | public boolean sendTouchEvent(long timeMs, int action, TouchPoint[] pts); |
| 283 | |
| 284 | /** |
| 285 | * Send a gesture event to the native side. |
| 286 | * @param type The type of the gesture event. |
| 287 | * @param timeMs The time the gesture event occurred at. |
| 288 | * @param x The x location for the gesture event. |
| 289 | * @param y The y location for the gesture event. |
| 290 | * @param lastInputEventForVSync Indicates that this gesture event is the last input |
| 291 | * to be event sent during the current vsync interval. |
| 292 | * @param extraParams A bundle that holds specific extra parameters for certain gestures. |
| 293 | * Refer to gesture type definition for more information. |
| 294 | * @return Whether the gesture was sent successfully. |
| 295 | */ |
| 296 | boolean sendGesture( |
| 297 | int type, long timeMs, int x, int y, boolean lastInputEventForVSync, |
| 298 | Bundle extraParams); |
| 299 | |
| 300 | /** |
| 301 | * Gives the UI the chance to override each scroll event. |
| 302 | * @param x The amount scrolled in the X direction. |
| 303 | * @param y The amount scrolled in the Y direction. |
| 304 | * @return Whether or not the UI consumed and handled this event. |
| 305 | */ |
| 306 | boolean didUIStealScroll(float x, float y); |
| 307 | |
| 308 | /** |
| 309 | * Show the zoom picker UI. |
| 310 | */ |
| 311 | public void invokeZoomPicker(); |
| 312 | |
| 313 | /** |
| 314 | * @return Whether changing the page scale is not possible on the current page. |
| 315 | */ |
| 316 | public boolean hasFixedPageScale(); |
| 317 | } |
| 318 | |
| 319 | ContentViewGestureHandler( |
| 320 | Context context, MotionEventDelegate delegate, ZoomManager zoomManager, |
| 321 | int inputEventDeliveryMode) { |
| 322 | mExtraParamBundle = new Bundle(); |
| 323 | mLongPressDetector = new LongPressDetector(context, this); |
| 324 | mMotionEventDelegate = delegate; |
| 325 | mZoomManager = zoomManager; |
| 326 | mSnapScrollController = new SnapScrollController(context, mZoomManager); |
| 327 | mInputEventsDeliveredAtVSync = |
| 328 | inputEventDeliveryMode == ContentViewCore.INPUT_EVENTS_DELIVERED_AT_VSYNC; |
| 329 | mPxToDp = 1.0f / context.getResources().getDisplayMetrics().density; |
| 330 | |
| 331 | initGestureDetectors(context); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Used to override the default long press detector, gesture detector and listener. |
| 336 | * This is used for testing only. |
| 337 | * @param longPressDetector The new LongPressDetector to be assigned. |
| 338 | * @param gestureDetector The new GestureDetector to be assigned. |
| 339 | * @param listener The new onGestureListener to be assigned. |
| 340 | */ |
| 341 | void setTestDependencies( |
| 342 | LongPressDetector longPressDetector, GestureDetector gestureDetector, |
| 343 | OnGestureListener listener) { |
| 344 | mLongPressDetector = longPressDetector; |
| 345 | mGestureDetector = gestureDetector; |
| 346 | mListener = listener; |
| 347 | } |
| 348 | |
| 349 | private void initGestureDetectors(final Context context) { |
| 350 | final int scaledTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); |
| 351 | mScaledTouchSlopSquare = scaledTouchSlop * scaledTouchSlop; |
| 352 | try { |
| 353 | TraceEvent.begin(); |
| 354 | GestureDetector.SimpleOnGestureListener listener = |
| 355 | new GestureDetector.SimpleOnGestureListener() { |
| 356 | @Override |
| 357 | public boolean onDown(MotionEvent e) { |
| 358 | mShowPressIsCalled = false; |
| 359 | mIgnoreSingleTap = false; |
| 360 | mTouchScrolling = false; |
| 361 | mSeenFirstScrollEvent = false; |
| 362 | mSnapScrollController.resetSnapScrollMode(); |
| 363 | mLastRawX = e.getRawX(); |
| 364 | mLastRawY = e.getRawY(); |
| 365 | mAccumulatedScrollErrorX = 0; |
| 366 | mAccumulatedScrollErrorY = 0; |
| 367 | // Return true to indicate that we want to handle touch |
| 368 | return true; |
| 369 | } |
| 370 | |
| 371 | @Override |
| 372 | public boolean onScroll(MotionEvent e1, MotionEvent e2, |
| 373 | float distanceX, float distanceY) { |
| 374 | if (!mSeenFirstScrollEvent) { |
| 375 | // Remove the touch slop region from the first scroll event to avoid a |
| 376 | // jump. |
| 377 | mSeenFirstScrollEvent = true; |
| 378 | double distance = Math.sqrt( |
| 379 | distanceX * distanceX + distanceY * distanceY); |
| 380 | double epsilon = 1e-3; |
| 381 | if (distance > epsilon) { |
| 382 | double ratio = Math.max(0, distance - scaledTouchSlop) / distance; |
| 383 | distanceX *= ratio; |
| 384 | distanceY *= ratio; |
| 385 | } |
| 386 | } |
| 387 | mSnapScrollController.updateSnapScrollMode(distanceX, distanceY); |
| 388 | if (mSnapScrollController.isSnappingScrolls()) { |
| 389 | if (mSnapScrollController.isSnapHorizontal()) { |
| 390 | distanceY = 0; |
| 391 | } else { |
| 392 | distanceX = 0; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | boolean didUIStealScroll = mMotionEventDelegate.didUIStealScroll( |
| 397 | e2.getRawX() - mLastRawX, e2.getRawY() - mLastRawY); |
| 398 | |
| 399 | mLastRawX = e2.getRawX(); |
| 400 | mLastRawY = e2.getRawY(); |
| 401 | if (didUIStealScroll) return true; |
| 402 | if (!mTouchScrolling) { |
| 403 | sendShowPressCancelIfNecessary(e1); |
| 404 | endFlingIfNecessary(e2.getEventTime()); |
| 405 | if (sendMotionEventAsGesture(GESTURE_SCROLL_START, e1, null)) { |
| 406 | mTouchScrolling = true; |
| 407 | } |
| 408 | } |
| 409 | // distanceX and distanceY is the scrolling offset since last onScroll. |
| 410 | // Because we are passing integers to webkit, this could introduce |
| 411 | // rounding errors. The rounding errors will accumulate overtime. |
| 412 | // To solve this, we should be adding back the rounding errors each time |
| 413 | // when we calculate the new offset. |
| 414 | int x = (int) e2.getX(); |
| 415 | int y = (int) e2.getY(); |
| 416 | int dx = (int) (distanceX + mAccumulatedScrollErrorX); |
| 417 | int dy = (int) (distanceY + mAccumulatedScrollErrorY); |
| 418 | mAccumulatedScrollErrorX = distanceX + mAccumulatedScrollErrorX - dx; |
| 419 | mAccumulatedScrollErrorY = distanceY + mAccumulatedScrollErrorY - dy; |
| 420 | mExtraParamBundle.clear(); |
| 421 | mExtraParamBundle.putInt(DISTANCE_X, dx); |
| 422 | mExtraParamBundle.putInt(DISTANCE_Y, dy); |
| 423 | if ((dx | dy) != 0) { |
| 424 | sendLastGestureForVSync(GESTURE_SCROLL_BY, |
| 425 | e2.getEventTime(), x, y, mExtraParamBundle); |
| 426 | } |
| 427 | |
| 428 | mMotionEventDelegate.invokeZoomPicker(); |
| 429 | |
| 430 | return true; |
| 431 | } |
| 432 | |
| 433 | @Override |
| 434 | public boolean onFling(MotionEvent e1, MotionEvent e2, |
| 435 | float velocityX, float velocityY) { |
| 436 | if (mSnapScrollController.isSnappingScrolls()) { |
| 437 | if (mSnapScrollController.isSnapHorizontal()) { |
| 438 | velocityY = 0; |
| 439 | } else { |
| 440 | velocityX = 0; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | fling(e1.getEventTime(),(int) e1.getX(0), (int) e1.getY(0), |
| 445 | (int) velocityX, (int) velocityY); |
| 446 | return true; |
| 447 | } |
| 448 | |
| 449 | @Override |
| 450 | public void onShowPress(MotionEvent e) { |
| 451 | mShowPressIsCalled = true; |
| 452 | sendMotionEventAsGesture(GESTURE_SHOW_PRESSED_STATE, e, null); |
| 453 | } |
| 454 | |
| 455 | @Override |
| 456 | public boolean onSingleTapUp(MotionEvent e) { |
| 457 | if (isDistanceBetweenDownAndUpTooLong(e.getRawX(), e.getRawY())) { |
| 458 | mIgnoreSingleTap = true; |
| 459 | return true; |
| 460 | } |
| 461 | // This is a hack to address the issue where user hovers |
| 462 | // over a link for longer than DOUBLE_TAP_TIMEOUT, then |
| 463 | // onSingleTapConfirmed() is not triggered. But we still |
| 464 | // want to trigger the tap event at UP. So we override |
| 465 | // onSingleTapUp() in this case. This assumes singleTapUp |
| 466 | // gets always called before singleTapConfirmed. |
| 467 | if (!mIgnoreSingleTap && !mLongPressDetector.isInLongPress()) { |
| 468 | if (e.getEventTime() - e.getDownTime() > DOUBLE_TAP_TIMEOUT) { |
| 469 | float x = e.getX(); |
| 470 | float y = e.getY(); |
| 471 | if (sendMotionEventAsGesture(GESTURE_SINGLE_TAP_UP, e, null)) { |
| 472 | mIgnoreSingleTap = true; |
| 473 | } |
| 474 | setClickXAndY((int) x, (int) y); |
| 475 | return true; |
| 476 | } else if (mMotionEventDelegate.hasFixedPageScale()) { |
| 477 | // If page is not user scalable, we don't need to wait |
| 478 | // for double tap timeout. |
| 479 | float x = e.getX(); |
| 480 | float y = e.getY(); |
| 481 | mExtraParamBundle.clear(); |
| 482 | mExtraParamBundle.putBoolean(SHOW_PRESS, mShowPressIsCalled); |
| 483 | if (sendMotionEventAsGesture(GESTURE_SINGLE_TAP_CONFIRMED, e, |
| 484 | mExtraParamBundle)) { |
| 485 | mIgnoreSingleTap = true; |
| 486 | } |
| 487 | setClickXAndY((int) x, (int) y); |
| 488 | } else { |
| 489 | // Notify Blink about this tapUp event anyway, |
| 490 | // when none of the above conditions applied. |
| 491 | sendMotionEventAsGesture(GESTURE_SINGLE_TAP_UNCONFIRMED, e, null); |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | return triggerLongTapIfNeeded(e); |
| 496 | } |
| 497 | |
| 498 | @Override |
| 499 | public boolean onSingleTapConfirmed(MotionEvent e) { |
| 500 | // Long taps in the edges of the screen have their events delayed by |
| 501 | // ContentViewHolder for tab swipe operations. As a consequence of the delay |
| 502 | // this method might be called after receiving the up event. |
| 503 | // These corner cases should be ignored. |
| 504 | if (mLongPressDetector.isInLongPress() || mIgnoreSingleTap) return true; |
| 505 | |
| 506 | int x = (int) e.getX(); |
| 507 | int y = (int) e.getY(); |
| 508 | mExtraParamBundle.clear(); |
| 509 | mExtraParamBundle.putBoolean(SHOW_PRESS, mShowPressIsCalled); |
| 510 | sendMotionEventAsGesture(GESTURE_SINGLE_TAP_CONFIRMED, e, |
| 511 | mExtraParamBundle); |
| 512 | setClickXAndY(x, y); |
| 513 | return true; |
| 514 | } |
| 515 | |
| 516 | @Override |
| 517 | public boolean onDoubleTapEvent(MotionEvent e) { |
| 518 | if (isDoubleTapDragDisabled()) return false; |
| 519 | switch (e.getActionMasked()) { |
| 520 | case MotionEvent.ACTION_DOWN: |
| 521 | sendShowPressCancelIfNecessary(e); |
| 522 | mDoubleTapDragZoomAnchorX = e.getX(); |
| 523 | mDoubleTapDragZoomAnchorY = e.getY(); |
| 524 | mDoubleTapDragMode = DOUBLE_TAP_DRAG_MODE_DETECTION_IN_PROGRESS; |
| 525 | break; |
| 526 | case MotionEvent.ACTION_MOVE: |
| 527 | if (mDoubleTapDragMode |
| 528 | == DOUBLE_TAP_DRAG_MODE_DETECTION_IN_PROGRESS) { |
| 529 | float distanceX = mDoubleTapDragZoomAnchorX - e.getX(); |
| 530 | float distanceY = mDoubleTapDragZoomAnchorY - e.getY(); |
| 531 | |
| 532 | // Begin double tap drag zoom mode if the move distance is |
| 533 | // further than the threshold. |
| 534 | if (distanceX * distanceX + distanceY * distanceY > |
| 535 | mScaledTouchSlopSquare) { |
| 536 | sendGesture(GESTURE_SCROLL_START, e.getEventTime(), |
| 537 | (int) e.getX(), (int) e.getY(), null); |
| 538 | pinchBegin(e.getEventTime(), |
| 539 | Math.round(mDoubleTapDragZoomAnchorX), |
| 540 | Math.round(mDoubleTapDragZoomAnchorY)); |
| 541 | mDoubleTapDragMode = DOUBLE_TAP_DRAG_MODE_ZOOM; |
| 542 | } |
| 543 | } else if (mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_ZOOM) { |
| 544 | mExtraParamBundle.clear(); |
| 545 | sendGesture(GESTURE_SCROLL_BY, e.getEventTime(), |
| 546 | (int) e.getX(), (int) e.getY(), mExtraParamBundle); |
| 547 | |
| 548 | float dy = mDoubleTapY - e.getY(); |
| 549 | pinchBy(e.getEventTime(), |
| 550 | Math.round(mDoubleTapDragZoomAnchorX), |
| 551 | Math.round(mDoubleTapDragZoomAnchorY), |
| 552 | (float) Math.pow(dy < 0 ? |
| 553 | 1.0f - DOUBLE_TAP_DRAG_ZOOM_SPEED : |
| 554 | 1.0f + DOUBLE_TAP_DRAG_ZOOM_SPEED, |
| 555 | Math.abs(dy * mPxToDp))); |
| 556 | } |
| 557 | break; |
| 558 | case MotionEvent.ACTION_UP: |
| 559 | if (mDoubleTapDragMode != DOUBLE_TAP_DRAG_MODE_ZOOM) { |
| 560 | // Normal double tap gesture. |
| 561 | sendMotionEventAsGesture(GESTURE_DOUBLE_TAP, e, null); |
| 562 | } |
| 563 | endDoubleTapDragMode(e); |
| 564 | break; |
| 565 | case MotionEvent.ACTION_CANCEL: |
| 566 | endDoubleTapDragMode(e); |
| 567 | break; |
| 568 | default: |
| 569 | break; |
| 570 | } |
| 571 | mDoubleTapY = e.getY(); |
| 572 | return true; |
| 573 | } |
| 574 | |
| 575 | @Override |
| 576 | public void onLongPress(MotionEvent e) { |
| 577 | if (!mZoomManager.isScaleGestureDetectionInProgress() && |
| 578 | (mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_NONE || |
| 579 | isDoubleTapDragDisabled())) { |
| 580 | sendShowPressCancelIfNecessary(e); |
| 581 | sendMotionEventAsGesture(GESTURE_LONG_PRESS, e, null); |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | /** |
| 586 | * This method inspects the distance between where the user started touching |
| 587 | * the surface, and where she released. If the points are too far apart, we |
| 588 | * should assume that the web page has consumed the scroll-events in-between, |
| 589 | * and as such, this should not be considered a single-tap. |
| 590 | * |
| 591 | * We use the Android frameworks notion of how far a touch can wander before |
| 592 | * we think the user is scrolling. |
| 593 | * |
| 594 | * @param x the new x coordinate |
| 595 | * @param y the new y coordinate |
| 596 | * @return true if the distance is too long to be considered a single tap |
| 597 | */ |
| 598 | private boolean isDistanceBetweenDownAndUpTooLong(float x, float y) { |
| 599 | double deltaX = mLastRawX - x; |
| 600 | double deltaY = mLastRawY - y; |
| 601 | return deltaX * deltaX + deltaY * deltaY > mScaledTouchSlopSquare; |
| 602 | } |
| 603 | }; |
| 604 | mListener = listener; |
| 605 | mGestureDetector = new GestureDetector(context, listener); |
| 606 | mGestureDetector.setIsLongpressEnabled(false); |
| 607 | } finally { |
| 608 | TraceEvent.end(); |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | /** |
| 613 | * @return LongPressDetector handling setting up timers for and canceling LongPress gestures. |
| 614 | */ |
| 615 | LongPressDetector getLongPressDetector() { |
| 616 | return mLongPressDetector; |
| 617 | } |
| 618 | |
| 619 | /** |
| 620 | * @param event Start a LongPress gesture event from the listener. |
| 621 | */ |
| 622 | @Override |
| 623 | public void onLongPress(MotionEvent event) { |
| 624 | mListener.onLongPress(event); |
| 625 | } |
| 626 | |
| 627 | /** |
| 628 | * Cancels any ongoing LongPress timers. |
| 629 | */ |
| 630 | void cancelLongPress() { |
| 631 | mLongPressDetector.cancelLongPress(); |
| 632 | } |
| 633 | |
| 634 | /** |
| 635 | * Fling the ContentView from the current position. |
| 636 | * @param x Fling touch starting position |
| 637 | * @param y Fling touch starting position |
| 638 | * @param velocityX Initial velocity of the fling (X) measured in pixels per second. |
| 639 | * @param velocityY Initial velocity of the fling (Y) measured in pixels per second. |
| 640 | */ |
| 641 | void fling(long timeMs, int x, int y, int velocityX, int velocityY) { |
| 642 | endFlingIfNecessary(timeMs); |
| 643 | if (!mTouchScrolling) { |
| 644 | // The native side needs a GESTURE_SCROLL_BEGIN before GESTURE_FLING_START |
| 645 | // to send the fling to the correct target. Send if it has not sent. |
| 646 | sendGesture(GESTURE_SCROLL_START, timeMs, x, y, null); |
| 647 | } |
| 648 | endTouchScrollIfNecessary(timeMs, false); |
| 649 | |
| 650 | mFlingMayBeActive = true; |
| 651 | |
| 652 | mExtraParamBundle.clear(); |
| 653 | mExtraParamBundle.putInt(VELOCITY_X, velocityX); |
| 654 | mExtraParamBundle.putInt(VELOCITY_Y, velocityY); |
| 655 | sendGesture(GESTURE_FLING_START, timeMs, x, y, mExtraParamBundle); |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * Send a GESTURE_FLING_CANCEL event if necessary. |
| 660 | * @param timeMs The time in ms for the event initiating this gesture. |
| 661 | */ |
| 662 | void endFlingIfNecessary(long timeMs) { |
| 663 | if (!mFlingMayBeActive) return; |
| 664 | mFlingMayBeActive = false; |
| 665 | sendGesture(GESTURE_FLING_CANCEL, timeMs, 0, 0, null); |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * End DOUBLE_TAP_DRAG_MODE_ZOOM by sending GESTURE_SCROLL_END and GESTURE_PINCH_END events. |
| 670 | * @param event A hint event that its x, y, and eventTime will be used for the ending events |
| 671 | * to send. This argument is an optional and can be null. |
| 672 | */ |
| 673 | void endDoubleTapDragMode(MotionEvent event) { |
| 674 | if (isDoubleTapDragDisabled()) return; |
| 675 | if (mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_ZOOM) { |
| 676 | if (event == null) event = obtainActionCancelMotionEvent(); |
| 677 | pinchEnd(event.getEventTime()); |
| 678 | sendGesture(GESTURE_SCROLL_END, event.getEventTime(), |
| 679 | (int) event.getX(), (int) event.getY(), null); |
| 680 | } |
| 681 | mDoubleTapDragMode = DOUBLE_TAP_DRAG_MODE_NONE; |
| 682 | } |
| 683 | |
| 684 | /** |
| 685 | * Reset touch scroll flag and optionally send a GESTURE_SCROLL_END event if necessary. |
| 686 | * @param timeMs The time in ms for the event initiating this gesture. |
| 687 | * @param sendScrollEndEvent Whether to send GESTURE_SCROLL_END event. |
| 688 | */ |
| 689 | private void endTouchScrollIfNecessary(long timeMs, boolean sendScrollEndEvent) { |
| 690 | if (!mTouchScrolling) return; |
| 691 | mTouchScrolling = false; |
| 692 | if (sendScrollEndEvent) { |
| 693 | sendGesture(GESTURE_SCROLL_END, timeMs, 0, 0, null); |
| 694 | } |
| 695 | } |
| 696 | |
| 697 | /** |
| 698 | * @return Whether native is tracking a scroll. |
| 699 | */ |
| 700 | boolean isNativeScrolling() { |
| 701 | // TODO(wangxianzhu): Also return true when fling is active once the UI knows exactly when |
| 702 | // the fling ends. |
| 703 | return mTouchScrolling; |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * @return Whether native is tracking a pinch (i.e. between sending GESTURE_PINCH_BEGIN and |
| 708 | * GESTURE_PINCH_END). |
| 709 | */ |
| 710 | boolean isNativePinching() { |
| 711 | return mPinchInProgress; |
| 712 | } |
| 713 | |
| 714 | /** |
| 715 | * Starts a pinch gesture. |
| 716 | * @param timeMs The time in ms for the event initiating this gesture. |
| 717 | * @param x The x coordinate for the event initiating this gesture. |
| 718 | * @param y The x coordinate for the event initiating this gesture. |
| 719 | */ |
| 720 | void pinchBegin(long timeMs, int x, int y) { |
| 721 | sendGesture(GESTURE_PINCH_BEGIN, timeMs, x, y, null); |
| 722 | } |
| 723 | |
| 724 | /** |
| 725 | * Pinch by a given percentage. |
| 726 | * @param timeMs The time in ms for the event initiating this gesture. |
| 727 | * @param anchorX The x coordinate for the anchor point to be used in pinch. |
| 728 | * @param anchorY The y coordinate for the anchor point to be used in pinch. |
| 729 | * @param delta The percentage to pinch by. |
| 730 | */ |
| 731 | void pinchBy(long timeMs, int anchorX, int anchorY, float delta) { |
| 732 | mExtraParamBundle.clear(); |
| 733 | mExtraParamBundle.putFloat(DELTA, delta); |
| 734 | sendLastGestureForVSync(GESTURE_PINCH_BY, timeMs, anchorX, anchorY, mExtraParamBundle); |
| 735 | mPinchInProgress = true; |
| 736 | } |
| 737 | |
| 738 | /** |
| 739 | * End a pinch gesture. |
| 740 | * @param timeMs The time in ms for the event initiating this gesture. |
| 741 | */ |
| 742 | void pinchEnd(long timeMs) { |
| 743 | sendGesture(GESTURE_PINCH_END, timeMs, 0, 0, null); |
| 744 | mPinchInProgress = false; |
| 745 | } |
| 746 | |
| 747 | /** |
| 748 | * Ignore singleTap gestures. |
| 749 | */ |
| 750 | void setIgnoreSingleTap(boolean value) { |
| 751 | mIgnoreSingleTap = value; |
| 752 | } |
| 753 | |
| 754 | private void setClickXAndY(int x, int y) { |
| 755 | mSingleTapX = x; |
| 756 | mSingleTapY = y; |
| 757 | } |
| 758 | |
| 759 | /** |
| 760 | * @return The x coordinate for the last point that a singleTap gesture was initiated from. |
| 761 | */ |
| 762 | public int getSingleTapX() { |
| 763 | return mSingleTapX; |
| 764 | } |
| 765 | |
| 766 | /** |
| 767 | * @return The y coordinate for the last point that a singleTap gesture was initiated from. |
| 768 | */ |
| 769 | public int getSingleTapY() { |
| 770 | return mSingleTapY; |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * Cancel the current touch event sequence by sending ACTION_CANCEL and ignore all the |
| 775 | * subsequent events until the next ACTION_DOWN. |
| 776 | * |
| 777 | * One example usecase is stop processing the touch events when showing context popup menu. |
| 778 | */ |
| 779 | public void setIgnoreRemainingTouchEvents() { |
| 780 | onTouchEvent(obtainActionCancelMotionEvent()); |
| 781 | mIgnoreRemainingTouchEvents = true; |
| 782 | } |
| 783 | |
| 784 | /** |
| 785 | * Handle the incoming MotionEvent. |
| 786 | * @return Whether the event was handled. |
| 787 | */ |
| 788 | boolean onTouchEvent(MotionEvent event) { |
| 789 | try { |
| 790 | TraceEvent.begin("onTouchEvent"); |
| 791 | |
| 792 | if (mIgnoreRemainingTouchEvents) { |
| 793 | if (event.getActionMasked() == MotionEvent.ACTION_DOWN) { |
| 794 | mIgnoreRemainingTouchEvents = false; |
| 795 | } else { |
| 796 | return false; |
| 797 | } |
| 798 | } |
| 799 | |
| 800 | mLongPressDetector.cancelLongPressIfNeeded(event); |
| 801 | mSnapScrollController.setSnapScrollingMode(event); |
| 802 | // Notify native that scrolling has stopped whenever a down action is processed prior to |
| 803 | // passing the event to native as it will drop them as an optimization if scrolling is |
| 804 | // enabled. Ending the fling ensures scrolling has stopped as well as terminating the |
| 805 | // current fling if applicable. |
| 806 | if (event.getActionMasked() == MotionEvent.ACTION_DOWN) { |
| 807 | mNoTouchHandlerForGesture = false; |
| 808 | mJavaScriptIsConsumingGesture = false; |
| 809 | endFlingIfNecessary(event.getEventTime()); |
| 810 | } else if (event.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN) { |
| 811 | endDoubleTapDragMode(null); |
| 812 | } |
| 813 | |
| 814 | if (offerTouchEventToJavaScript(event)) { |
| 815 | // offerTouchEventToJavaScript returns true to indicate the event was sent |
| 816 | // to the render process. If it is not subsequently handled, it will |
| 817 | // be returned via confirmTouchEvent(false) and eventually passed to |
| 818 | // processTouchEvent asynchronously. |
| 819 | return true; |
| 820 | } |
| 821 | return processTouchEvent(event); |
| 822 | } finally { |
| 823 | TraceEvent.end("onTouchEvent"); |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | private MotionEvent obtainActionCancelMotionEvent() { |
| 828 | return MotionEvent.obtain( |
| 829 | SystemClock.uptimeMillis(), |
| 830 | SystemClock.uptimeMillis(), |
| 831 | MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); |
| 832 | } |
| 833 | |
| 834 | /** |
| 835 | * Resets gesture handlers state; called on didStartLoading(). |
| 836 | * Note that this does NOT clear the pending motion events queue; |
| 837 | * it gets cleared in hasTouchEventHandlers() called from WebKit |
| 838 | * FrameLoader::transitionToCommitted iff the page ever had touch handlers. |
| 839 | */ |
| 840 | void resetGestureHandlers() { |
| 841 | { |
| 842 | MotionEvent me = obtainActionCancelMotionEvent(); |
| 843 | mGestureDetector.onTouchEvent(me); |
| 844 | me.recycle(); |
| 845 | } |
| 846 | { |
| 847 | MotionEvent me = obtainActionCancelMotionEvent(); |
| 848 | mZoomManager.processTouchEvent(me); |
| 849 | me.recycle(); |
| 850 | } |
| 851 | mLongPressDetector.cancelLongPress(); |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * Sets the flag indicating that the content has registered listeners for touch events. |
| 856 | */ |
| 857 | void hasTouchEventHandlers(boolean hasTouchHandlers) { |
| 858 | mHasTouchHandlers = hasTouchHandlers; |
| 859 | // When mainframe is loading, FrameLoader::transitionToCommitted will |
| 860 | // call this method to set mHasTouchHandlers to false. We use this as |
| 861 | // an indicator to clear the pending motion events so that events from |
| 862 | // the previous page will not be carried over to the new page. |
| 863 | if (!mHasTouchHandlers) mPendingMotionEvents.clear(); |
| 864 | } |
| 865 | |
| 866 | private boolean offerTouchEventToJavaScript(MotionEvent event) { |
| 867 | mLongPressDetector.onOfferTouchEventToJavaScript(event); |
| 868 | |
| 869 | if (!mHasTouchHandlers || mNoTouchHandlerForGesture) return false; |
| 870 | |
| 871 | if (event.getActionMasked() == MotionEvent.ACTION_MOVE) { |
| 872 | // Only send move events if the move has exceeded the slop threshold. |
| 873 | if (!mLongPressDetector.confirmOfferMoveEventToJavaScript(event)) { |
| 874 | return true; |
| 875 | } |
| 876 | // Avoid flooding the renderer process with move events: if the previous pending |
| 877 | // command is also a move (common case) that has not yet been forwarded, skip sending |
| 878 | // this event to the webkit side and collapse it into the pending event. |
| 879 | MotionEvent previousEvent = mPendingMotionEvents.peekLast(); |
| 880 | if (previousEvent != null |
| 881 | && previousEvent != mPendingMotionEvents.peekFirst() |
| 882 | && previousEvent.getActionMasked() == MotionEvent.ACTION_MOVE |
| 883 | && previousEvent.getPointerCount() == event.getPointerCount()) { |
| 884 | TraceEvent.instant("offerTouchEventToJavaScript:EventCoalesced", |
| 885 | "QueueSize = " + mPendingMotionEvents.size()); |
| 886 | MotionEvent.PointerCoords[] coords = |
| 887 | new MotionEvent.PointerCoords[event.getPointerCount()]; |
| 888 | for (int i = 0; i < coords.length; ++i) { |
| 889 | coords[i] = new MotionEvent.PointerCoords(); |
| 890 | event.getPointerCoords(i, coords[i]); |
| 891 | } |
| 892 | previousEvent.addBatch(event.getEventTime(), coords, event.getMetaState()); |
| 893 | return true; |
| 894 | } |
| 895 | } |
| 896 | if (mPendingMotionEvents.isEmpty()) { |
| 897 | // Add the event to the pending queue prior to calling sendPendingEventToNative. |
| 898 | // When sending an event to native, the callback to confirmTouchEvent can be |
| 899 | // synchronous or asynchronous and confirmTouchEvent expects the event to be |
| 900 | // in the queue when it is called. |
| 901 | MotionEvent clone = MotionEvent.obtain(event); |
| 902 | mPendingMotionEvents.add(clone); |
| 903 | |
| 904 | int forward = sendPendingEventToNative(); |
| 905 | if (forward == EVENT_NOT_FORWARDED) mPendingMotionEvents.remove(clone); |
| 906 | return forward != EVENT_NOT_FORWARDED; |
| 907 | } else { |
| 908 | TraceEvent.instant("offerTouchEventToJavaScript:EventQueued", |
| 909 | "QueueSize = " + mPendingMotionEvents.size()); |
| 910 | // Copy the event, as the original may get mutated after this method returns. |
| 911 | MotionEvent clone = MotionEvent.obtain(event); |
| 912 | mPendingMotionEvents.add(clone); |
| 913 | return true; |
| 914 | } |
| 915 | } |
| 916 | |
| 917 | private int sendPendingEventToNative() { |
| 918 | MotionEvent event = mPendingMotionEvents.peekFirst(); |
| 919 | if (event == null) { |
| 920 | assert false : "Cannot send from an empty pending event queue"; |
| 921 | return EVENT_NOT_FORWARDED; |
| 922 | } |
| 923 | |
| 924 | if (mTouchEventTimeoutHandler.hasTimeoutEvent()) return EVENT_NOT_FORWARDED; |
| 925 | |
| 926 | TouchPoint[] pts = new TouchPoint[event.getPointerCount()]; |
| 927 | int type = TouchPoint.createTouchPoints(event, pts); |
| 928 | |
| 929 | if (type == TouchPoint.CONVERSION_ERROR) return EVENT_NOT_FORWARDED; |
| 930 | |
| 931 | if (!mTouchScrolling && !mPinchInProgress) { |
| 932 | mTouchCancelEventSent = false; |
| 933 | |
| 934 | if (mMotionEventDelegate.sendTouchEvent(event.getEventTime(), type, pts)) { |
| 935 | // If confirmTouchEvent() is called synchronously with respect to sendTouchEvent(), |
| 936 | // then |event| will have been recycled. Only start the timer if the sent event has |
| 937 | // not yet been confirmed. |
| 938 | if (!mJavaScriptIsConsumingGesture |
| 939 | && event == mPendingMotionEvents.peekFirst() |
| 940 | && event.getAction() != MotionEvent.ACTION_UP |
| 941 | && event.getAction() != MotionEvent.ACTION_CANCEL) { |
| 942 | mTouchEventTimeoutHandler.start(event.getEventTime(), pts); |
| 943 | } |
| 944 | return EVENT_FORWARDED_TO_NATIVE; |
| 945 | } |
| 946 | } else if (!mTouchCancelEventSent) { |
| 947 | mTouchCancelEventSent = true; |
| 948 | |
| 949 | MotionEvent previousCancelEvent = mLastCancelledEvent; |
| 950 | mLastCancelledEvent = event; |
| 951 | |
| 952 | if (mMotionEventDelegate.sendTouchEvent(event.getEventTime(), |
| 953 | TouchPoint.TOUCH_EVENT_TYPE_CANCEL, pts)) { |
| 954 | return EVENT_CONVERTED_TO_CANCEL; |
| 955 | } else { |
| 956 | mLastCancelledEvent = previousCancelEvent; |
| 957 | } |
| 958 | } |
| 959 | return EVENT_NOT_FORWARDED; |
| 960 | } |
| 961 | |
| 962 | private boolean processTouchEvent(MotionEvent event) { |
| 963 | boolean handled = false; |
| 964 | // The last "finger up" is an end to scrolling but may not be |
| 965 | // an end to movement (e.g. fling scroll). We do not tell |
| 966 | // native code to end scrolling until we are sure we did not |
| 967 | // fling. |
| 968 | boolean possiblyEndMovement = false; |
| 969 | // "Last finger raised" could be an end to movement. However, |
| 970 | // give the mSimpleTouchDetector a chance to continue |
| 971 | // scrolling with a fling. |
| 972 | if (event.getAction() == MotionEvent.ACTION_UP) { |
| 973 | if (mTouchScrolling) { |
| 974 | possiblyEndMovement = true; |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | mLongPressDetector.cancelLongPressIfNeeded(event); |
| 979 | mLongPressDetector.startLongPressTimerIfNeeded(event); |
| 980 | |
| 981 | // Use the framework's GestureDetector to detect pans and zooms not already |
| 982 | // handled by the WebKit touch events gesture manager. |
| 983 | if (canHandle(event)) { |
| 984 | handled |= mGestureDetector.onTouchEvent(event); |
| 985 | if (event.getAction() == MotionEvent.ACTION_DOWN) { |
| 986 | mCurrentDownEvent = MotionEvent.obtain(event); |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | handled |= mZoomManager.processTouchEvent(event); |
| 991 | |
| 992 | if (possiblyEndMovement && !handled) { |
| 993 | endTouchScrollIfNecessary(event.getEventTime(), true); |
| 994 | } |
| 995 | |
| 996 | return handled; |
| 997 | } |
| 998 | |
| 999 | /** |
| 1000 | * For testing to simulate a timeout of a touch event handler. |
| 1001 | */ |
| 1002 | void mockTouchEventTimeout() { |
| 1003 | mTouchEventTimeoutHandler.mockTimeout(); |
| 1004 | } |
| 1005 | |
| 1006 | /** |
| 1007 | * Respond to a MotionEvent being returned from the native side. |
| 1008 | * @param ackResult The status acknowledgment code. |
| 1009 | */ |
| 1010 | void confirmTouchEvent(int ackResult) { |
| 1011 | if (mTouchEventTimeoutHandler.confirmTouchEvent()) return; |
| 1012 | if (mPendingMotionEvents.isEmpty()) { |
| 1013 | Log.w(TAG, "confirmTouchEvent with Empty pending list!"); |
| 1014 | return; |
| 1015 | } |
| 1016 | TraceEvent.begin("confirmTouchEvent"); |
| 1017 | MotionEvent ackedEvent = mPendingMotionEvents.removeFirst(); |
| 1018 | if (ackedEvent == mLastCancelledEvent) { |
| 1019 | // The event is canceled, just drain all the pending events until next |
| 1020 | // touch down. |
| 1021 | ackResult = INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS; |
| 1022 | TraceEvent.instant("confirmTouchEvent:CanceledEvent"); |
| 1023 | } |
| 1024 | switch (ackResult) { |
| 1025 | case INPUT_EVENT_ACK_STATE_UNKNOWN: |
| 1026 | // This should never get sent. |
| 1027 | assert(false); |
| 1028 | break; |
| 1029 | case INPUT_EVENT_ACK_STATE_CONSUMED: |
| 1030 | mJavaScriptIsConsumingGesture = true; |
| 1031 | mZoomManager.passTouchEventThrough(ackedEvent); |
| 1032 | trySendPendingEventsToNative(); |
| 1033 | break; |
| 1034 | case INPUT_EVENT_ACK_STATE_NOT_CONSUMED: |
| 1035 | if (!mJavaScriptIsConsumingGesture) processTouchEvent(ackedEvent); |
| 1036 | trySendPendingEventsToNative(); |
| 1037 | break; |
| 1038 | case INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS: |
| 1039 | mNoTouchHandlerForGesture = true; |
| 1040 | processTouchEvent(ackedEvent); |
| 1041 | drainAllPendingEventsUntilNextDown(); |
| 1042 | break; |
| 1043 | default: |
| 1044 | break; |
| 1045 | } |
| 1046 | |
| 1047 | mLongPressDetector.cancelLongPressIfNeeded(mPendingMotionEvents.iterator()); |
| 1048 | |
| 1049 | recycleEvent(ackedEvent); |
| 1050 | TraceEvent.end("confirmTouchEvent"); |
| 1051 | } |
| 1052 | |
| 1053 | private void trySendPendingEventsToNative() { |
| 1054 | while (!mPendingMotionEvents.isEmpty()) { |
| 1055 | int forward = sendPendingEventToNative(); |
| 1056 | if (forward != EVENT_NOT_FORWARDED) break; |
| 1057 | |
| 1058 | // Even though we missed sending one event to native, as long as we haven't |
| 1059 | // received INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, we should keep sending |
| 1060 | // events on the queue to native. |
| 1061 | MotionEvent event = mPendingMotionEvents.removeFirst(); |
| 1062 | if (!mJavaScriptIsConsumingGesture) processTouchEvent(event); |
| 1063 | recycleEvent(event); |
| 1064 | } |
| 1065 | } |
| 1066 | |
| 1067 | private void drainAllPendingEventsUntilNextDown() { |
| 1068 | // Now process all events that are in the queue until the next down event. |
| 1069 | MotionEvent nextEvent = mPendingMotionEvents.peekFirst(); |
| 1070 | while (nextEvent != null && nextEvent.getActionMasked() != MotionEvent.ACTION_DOWN) { |
| 1071 | processTouchEvent(nextEvent); |
| 1072 | mPendingMotionEvents.removeFirst(); |
| 1073 | recycleEvent(nextEvent); |
| 1074 | nextEvent = mPendingMotionEvents.peekFirst(); |
| 1075 | } |
| 1076 | |
| 1077 | if (nextEvent == null) return; |
| 1078 | |
| 1079 | mNoTouchHandlerForGesture = false; |
| 1080 | trySendPendingEventsToNative(); |
| 1081 | } |
| 1082 | |
| 1083 | private void recycleEvent(MotionEvent event) { |
| 1084 | if (event == mLastCancelledEvent) { |
| 1085 | mLastCancelledEvent = null; |
| 1086 | } |
| 1087 | event.recycle(); |
| 1088 | } |
| 1089 | |
| 1090 | private boolean sendMotionEventAsGesture( |
| 1091 | int type, MotionEvent event, Bundle extraParams) { |
| 1092 | return mMotionEventDelegate.sendGesture(type, event.getEventTime(), |
| 1093 | (int) event.getX(), (int) event.getY(), false, extraParams); |
| 1094 | } |
| 1095 | |
| 1096 | private boolean sendGesture( |
| 1097 | int type, long timeMs, int x, int y, Bundle extraParams) { |
| 1098 | return mMotionEventDelegate.sendGesture(type, timeMs, x, y, false, extraParams); |
| 1099 | } |
| 1100 | |
| 1101 | private boolean sendLastGestureForVSync( |
| 1102 | int type, long timeMs, int x, int y, Bundle extraParams) { |
| 1103 | return mMotionEventDelegate.sendGesture( |
| 1104 | type, timeMs, x, y, mInputEventsDeliveredAtVSync, extraParams); |
| 1105 | } |
| 1106 | |
| 1107 | void sendShowPressCancelIfNecessary(MotionEvent e) { |
| 1108 | if (!mShowPressIsCalled) return; |
| 1109 | |
| 1110 | if (sendMotionEventAsGesture(GESTURE_SHOW_PRESS_CANCEL, e, null)) { |
| 1111 | mShowPressIsCalled = false; |
| 1112 | } |
| 1113 | } |
| 1114 | |
| 1115 | /** |
| 1116 | * @return Whether the ContentViewGestureHandler can handle a MotionEvent right now. True only |
| 1117 | * if it's the start of a new stream (ACTION_DOWN), or a continuation of the current stream. |
| 1118 | */ |
| 1119 | boolean canHandle(MotionEvent ev) { |
| 1120 | return ev.getAction() == MotionEvent.ACTION_DOWN || |
| 1121 | (mCurrentDownEvent != null && mCurrentDownEvent.getDownTime() == ev.getDownTime()); |
| 1122 | } |
| 1123 | |
| 1124 | /** |
| 1125 | * @return Whether the event can trigger a LONG_TAP gesture. True when it can and the event |
| 1126 | * will be consumed. |
| 1127 | */ |
| 1128 | boolean triggerLongTapIfNeeded(MotionEvent ev) { |
| 1129 | if (mLongPressDetector.isInLongPress() && ev.getAction() == MotionEvent.ACTION_UP && |
| 1130 | !mZoomManager.isScaleGestureDetectionInProgress()) { |
| 1131 | sendShowPressCancelIfNecessary(ev); |
| 1132 | sendMotionEventAsGesture(GESTURE_LONG_TAP, ev, null); |
| 1133 | return true; |
| 1134 | } |
| 1135 | return false; |
| 1136 | } |
| 1137 | |
| 1138 | /** |
| 1139 | * This is for testing only. |
| 1140 | * @return The first motion event on the pending motion events queue. |
| 1141 | */ |
| 1142 | MotionEvent peekFirstInPendingMotionEventsForTesting() { |
| 1143 | return mPendingMotionEvents.peekFirst(); |
| 1144 | } |
| 1145 | |
| 1146 | /** |
| 1147 | * This is for testing only. |
| 1148 | * @return Whether the motion event is cancelled. |
| 1149 | */ |
| 1150 | boolean isEventCancelledForTesting(MotionEvent event) { |
| 1151 | return event != null && event == mLastCancelledEvent; |
| 1152 | } |
| 1153 | |
| 1154 | /** |
| 1155 | * This is for testing only. |
| 1156 | * @return The number of motion events on the pending motion events queue. |
| 1157 | */ |
| 1158 | int getNumberOfPendingMotionEventsForTesting() { |
| 1159 | return mPendingMotionEvents.size(); |
| 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * This is for testing only. |
| 1164 | * Sends a show pressed state gesture through mListener. This should always be called after |
| 1165 | * a down event; |
| 1166 | */ |
| 1167 | void sendShowPressedStateGestureForTesting() { |
| 1168 | if (mCurrentDownEvent == null) return; |
| 1169 | mListener.onShowPress(mCurrentDownEvent); |
| 1170 | } |
| 1171 | |
| 1172 | /** |
| 1173 | * This is for testing only. |
| 1174 | * @return Whether a touch timeout event has been scheduled. |
| 1175 | */ |
| 1176 | boolean hasScheduledTouchTimeoutEventForTesting() { |
| 1177 | return mTouchEventTimeoutHandler.hasScheduledTimeoutEventForTesting(); |
| 1178 | } |
| 1179 | |
| 1180 | public void updateDoubleTapDragSupport(boolean supportDoubleTapDrag) { |
| 1181 | assert (mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_DISABLED || |
| 1182 | mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_NONE); |
| 1183 | mDoubleTapDragMode = supportDoubleTapDrag ? |
| 1184 | DOUBLE_TAP_DRAG_MODE_NONE : DOUBLE_TAP_DRAG_MODE_DISABLED; |
| 1185 | } |
| 1186 | |
| 1187 | private boolean isDoubleTapDragDisabled() { |
| 1188 | return mDoubleTapDragMode == DOUBLE_TAP_DRAG_MODE_DISABLED; |
| 1189 | } |
| 1190 | } |