The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 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 | |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 19 | import android.content.Context; |
| 20 | import android.os.Build; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | import android.os.Handler; |
| 22 | import android.os.Message; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 23 | |
| 24 | /** |
| 25 | * Detects various gestures and events using the supplied {@link MotionEvent}s. |
| 26 | * The {@link OnGestureListener} callback will notify users when a particular |
| 27 | * motion event has occurred. This class should only be used with {@link MotionEvent}s |
| 28 | * reported via touch (don't use for trackball events). |
| 29 | * |
| 30 | * To use this class: |
| 31 | * <ul> |
| 32 | * <li>Create an instance of the {@code GestureDetector} for your {@link View} |
| 33 | * <li>In the {@link View#onTouchEvent(MotionEvent)} method ensure you call |
| 34 | * {@link #onTouchEvent(MotionEvent)}. The methods defined in your callback |
| 35 | * will be executed when the events occur. |
| 36 | * </ul> |
| 37 | */ |
| 38 | public class GestureDetector { |
| 39 | /** |
| 40 | * The listener that is used to notify when gestures occur. |
| 41 | * If you want to listen for all the different gestures then implement |
| 42 | * this interface. If you only want to listen for a subset it might |
| 43 | * be easier to extend {@link SimpleOnGestureListener}. |
| 44 | */ |
| 45 | public interface OnGestureListener { |
| 46 | |
| 47 | /** |
| 48 | * Notified when a tap occurs with the down {@link MotionEvent} |
| 49 | * that triggered it. This will be triggered immediately for |
| 50 | * every down event. All other events should be preceded by this. |
| 51 | * |
| 52 | * @param e The down motion event. |
| 53 | */ |
| 54 | boolean onDown(MotionEvent e); |
| 55 | |
| 56 | /** |
| 57 | * The user has performed a down {@link MotionEvent} and not performed |
| 58 | * a move or up yet. This event is commonly used to provide visual |
| 59 | * feedback to the user to let them know that their action has been |
| 60 | * recognized i.e. highlight an element. |
| 61 | * |
| 62 | * @param e The down motion event |
| 63 | */ |
| 64 | void onShowPress(MotionEvent e); |
| 65 | |
| 66 | /** |
| 67 | * Notified when a tap occurs with the up {@link MotionEvent} |
| 68 | * that triggered it. |
| 69 | * |
| 70 | * @param e The up motion event that completed the first tap |
| 71 | * @return true if the event is consumed, else false |
| 72 | */ |
| 73 | boolean onSingleTapUp(MotionEvent e); |
| 74 | |
| 75 | /** |
| 76 | * Notified when a scroll occurs with the initial on down {@link MotionEvent} and the |
| 77 | * current move {@link MotionEvent}. The distance in x and y is also supplied for |
| 78 | * convenience. |
| 79 | * |
| 80 | * @param e1 The first down motion event that started the scrolling. |
| 81 | * @param e2 The move motion event that triggered the current onScroll. |
| 82 | * @param distanceX The distance along the X axis that has been scrolled since the last |
| 83 | * call to onScroll. This is NOT the distance between {@code e1} |
| 84 | * and {@code e2}. |
| 85 | * @param distanceY The distance along the Y axis that has been scrolled since the last |
| 86 | * call to onScroll. This is NOT the distance between {@code e1} |
| 87 | * and {@code e2}. |
| 88 | * @return true if the event is consumed, else false |
| 89 | */ |
| 90 | boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY); |
| 91 | |
| 92 | /** |
| 93 | * Notified when a long press occurs with the initial on down {@link MotionEvent} |
| 94 | * that trigged it. |
| 95 | * |
| 96 | * @param e The initial on down motion event that started the longpress. |
| 97 | */ |
| 98 | void onLongPress(MotionEvent e); |
| 99 | |
| 100 | /** |
| 101 | * Notified of a fling event when it occurs with the initial on down {@link MotionEvent} |
| 102 | * and the matching up {@link MotionEvent}. The calculated velocity is supplied along |
| 103 | * the x and y axis in pixels per second. |
| 104 | * |
| 105 | * @param e1 The first down motion event that started the fling. |
| 106 | * @param e2 The move motion event that triggered the current onFling. |
| 107 | * @param velocityX The velocity of this fling measured in pixels per second |
| 108 | * along the x axis. |
| 109 | * @param velocityY The velocity of this fling measured in pixels per second |
| 110 | * along the y axis. |
| 111 | * @return true if the event is consumed, else false |
| 112 | */ |
| 113 | boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * The listener that is used to notify when a double-tap or a confirmed |
| 118 | * single-tap occur. |
| 119 | */ |
| 120 | public interface OnDoubleTapListener { |
| 121 | /** |
| 122 | * Notified when a single-tap occurs. |
| 123 | * <p> |
| 124 | * Unlike {@link OnGestureListener#onSingleTapUp(MotionEvent)}, this |
| 125 | * will only be called after the detector is confident that the user's |
| 126 | * first tap is not followed by a second tap leading to a double-tap |
| 127 | * gesture. |
| 128 | * |
| 129 | * @param e The down motion event of the single-tap. |
| 130 | * @return true if the event is consumed, else false |
| 131 | */ |
| 132 | boolean onSingleTapConfirmed(MotionEvent e); |
| 133 | |
| 134 | /** |
| 135 | * Notified when a double-tap occurs. |
| 136 | * |
| 137 | * @param e The down motion event of the first tap of the double-tap. |
| 138 | * @return true if the event is consumed, else false |
| 139 | */ |
| 140 | boolean onDoubleTap(MotionEvent e); |
| 141 | |
| 142 | /** |
| 143 | * Notified when an event within a double-tap gesture occurs, including |
| 144 | * the down, move, and up events. |
| 145 | * |
| 146 | * @param e The motion event that occurred during the double-tap gesture. |
| 147 | * @return true if the event is consumed, else false |
| 148 | */ |
| 149 | boolean onDoubleTapEvent(MotionEvent e); |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * A convenience class to extend when you only want to listen for a subset |
| 154 | * of all the gestures. This implements all methods in the |
| 155 | * {@link OnGestureListener} and {@link OnDoubleTapListener} but does |
| 156 | * nothing and return {@code false} for all applicable methods. |
| 157 | */ |
| 158 | public static class SimpleOnGestureListener implements OnGestureListener, OnDoubleTapListener { |
| 159 | public boolean onSingleTapUp(MotionEvent e) { |
| 160 | return false; |
| 161 | } |
| 162 | |
| 163 | public void onLongPress(MotionEvent e) { |
| 164 | } |
| 165 | |
| 166 | public boolean onScroll(MotionEvent e1, MotionEvent e2, |
| 167 | float distanceX, float distanceY) { |
| 168 | return false; |
| 169 | } |
| 170 | |
| 171 | public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, |
| 172 | float velocityY) { |
| 173 | return false; |
| 174 | } |
| 175 | |
| 176 | public void onShowPress(MotionEvent e) { |
| 177 | } |
| 178 | |
| 179 | public boolean onDown(MotionEvent e) { |
| 180 | return false; |
| 181 | } |
| 182 | |
| 183 | public boolean onDoubleTap(MotionEvent e) { |
| 184 | return false; |
| 185 | } |
| 186 | |
| 187 | public boolean onDoubleTapEvent(MotionEvent e) { |
| 188 | return false; |
| 189 | } |
| 190 | |
| 191 | public boolean onSingleTapConfirmed(MotionEvent e) { |
| 192 | return false; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | // TODO: ViewConfiguration |
| 197 | private int mBiggerTouchSlopSquare = 20 * 20; |
| 198 | |
| 199 | private int mTouchSlopSquare; |
| 200 | private int mDoubleTapSlopSquare; |
| 201 | private int mMinimumFlingVelocity; |
Romain Guy | 4296fc4 | 2009-07-06 11:48:52 -0700 | [diff] [blame] | 202 | private int mMaximumFlingVelocity; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 203 | |
| 204 | private static final int LONGPRESS_TIMEOUT = ViewConfiguration.getLongPressTimeout(); |
| 205 | private static final int TAP_TIMEOUT = ViewConfiguration.getTapTimeout(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 206 | private static final int DOUBLE_TAP_TIMEOUT = ViewConfiguration.getDoubleTapTimeout(); |
| 207 | |
| 208 | // constants for Message.what used by GestureHandler below |
| 209 | private static final int SHOW_PRESS = 1; |
| 210 | private static final int LONG_PRESS = 2; |
| 211 | private static final int TAP = 3; |
| 212 | |
| 213 | private final Handler mHandler; |
| 214 | private final OnGestureListener mListener; |
| 215 | private OnDoubleTapListener mDoubleTapListener; |
| 216 | |
| 217 | private boolean mStillDown; |
| 218 | private boolean mInLongPress; |
| 219 | private boolean mAlwaysInTapRegion; |
| 220 | private boolean mAlwaysInBiggerTapRegion; |
| 221 | |
| 222 | private MotionEvent mCurrentDownEvent; |
| 223 | private MotionEvent mPreviousUpEvent; |
| 224 | |
| 225 | /** |
| 226 | * True when the user is still touching for the second tap (down, move, and |
| 227 | * up events). Can only be true if there is a double tap listener attached. |
| 228 | */ |
| 229 | private boolean mIsDoubleTapping; |
| 230 | |
| 231 | private float mLastMotionY; |
| 232 | private float mLastMotionX; |
| 233 | |
| 234 | private boolean mIsLongpressEnabled; |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 235 | |
| 236 | /** |
| 237 | * True if we are at a target API level of >= Froyo or the developer can |
| 238 | * explicitly set it. If true, input events with > 1 pointer will be ignored |
| 239 | * so we can work side by side with multitouch gesture detectors. |
| 240 | */ |
| 241 | private boolean mIgnoreMultitouch; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 242 | |
| 243 | /** |
| 244 | * Determines speed during touch scrolling |
| 245 | */ |
| 246 | private VelocityTracker mVelocityTracker; |
| 247 | |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 248 | /** |
| 249 | * Consistency verifier for debugging purposes. |
| 250 | */ |
| 251 | private final InputEventConsistencyVerifier mInputEventConsistencyVerifier = |
| 252 | InputEventConsistencyVerifier.isInstrumentationEnabled() ? |
| 253 | new InputEventConsistencyVerifier(this, 0) : null; |
| 254 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 255 | private class GestureHandler extends Handler { |
| 256 | GestureHandler() { |
| 257 | super(); |
| 258 | } |
| 259 | |
| 260 | GestureHandler(Handler handler) { |
| 261 | super(handler.getLooper()); |
| 262 | } |
| 263 | |
| 264 | @Override |
| 265 | public void handleMessage(Message msg) { |
| 266 | switch (msg.what) { |
| 267 | case SHOW_PRESS: |
| 268 | mListener.onShowPress(mCurrentDownEvent); |
| 269 | break; |
| 270 | |
| 271 | case LONG_PRESS: |
| 272 | dispatchLongPress(); |
| 273 | break; |
| 274 | |
| 275 | case TAP: |
| 276 | // If the user's finger is still down, do not count it as a tap |
| 277 | if (mDoubleTapListener != null && !mStillDown) { |
| 278 | mDoubleTapListener.onSingleTapConfirmed(mCurrentDownEvent); |
| 279 | } |
| 280 | break; |
| 281 | |
| 282 | default: |
| 283 | throw new RuntimeException("Unknown message " + msg); //never |
| 284 | } |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /** |
| 289 | * Creates a GestureDetector with the supplied listener. |
| 290 | * This variant of the constructor should be used from a non-UI thread |
| 291 | * (as it allows specifying the Handler). |
| 292 | * |
| 293 | * @param listener the listener invoked for all the callbacks, this must |
| 294 | * not be null. |
| 295 | * @param handler the handler to use |
| 296 | * |
| 297 | * @throws NullPointerException if either {@code listener} or |
| 298 | * {@code handler} is null. |
| 299 | * |
| 300 | * @deprecated Use {@link #GestureDetector(android.content.Context, |
| 301 | * android.view.GestureDetector.OnGestureListener, android.os.Handler)} instead. |
| 302 | */ |
| 303 | @Deprecated |
| 304 | public GestureDetector(OnGestureListener listener, Handler handler) { |
| 305 | this(null, listener, handler); |
| 306 | } |
| 307 | |
| 308 | /** |
| 309 | * Creates a GestureDetector with the supplied listener. |
| 310 | * You may only use this constructor from a UI thread (this is the usual situation). |
| 311 | * @see android.os.Handler#Handler() |
| 312 | * |
| 313 | * @param listener the listener invoked for all the callbacks, this must |
| 314 | * not be null. |
| 315 | * |
| 316 | * @throws NullPointerException if {@code listener} is null. |
| 317 | * |
| 318 | * @deprecated Use {@link #GestureDetector(android.content.Context, |
| 319 | * android.view.GestureDetector.OnGestureListener)} instead. |
| 320 | */ |
| 321 | @Deprecated |
| 322 | public GestureDetector(OnGestureListener listener) { |
| 323 | this(null, listener, null); |
| 324 | } |
| 325 | |
| 326 | /** |
| 327 | * Creates a GestureDetector with the supplied listener. |
| 328 | * You may only use this constructor from a UI thread (this is the usual situation). |
| 329 | * @see android.os.Handler#Handler() |
| 330 | * |
| 331 | * @param context the application's context |
| 332 | * @param listener the listener invoked for all the callbacks, this must |
| 333 | * not be null. |
| 334 | * |
| 335 | * @throws NullPointerException if {@code listener} is null. |
| 336 | */ |
| 337 | public GestureDetector(Context context, OnGestureListener listener) { |
| 338 | this(context, listener, null); |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * Creates a GestureDetector with the supplied listener. |
| 343 | * You may only use this constructor from a UI thread (this is the usual situation). |
| 344 | * @see android.os.Handler#Handler() |
| 345 | * |
| 346 | * @param context the application's context |
| 347 | * @param listener the listener invoked for all the callbacks, this must |
| 348 | * not be null. |
| 349 | * @param handler the handler to use |
| 350 | * |
| 351 | * @throws NullPointerException if {@code listener} is null. |
| 352 | */ |
| 353 | public GestureDetector(Context context, OnGestureListener listener, Handler handler) { |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 354 | this(context, listener, handler, context != null && |
| 355 | context.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.FROYO); |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * Creates a GestureDetector with the supplied listener. |
| 360 | * You may only use this constructor from a UI thread (this is the usual situation). |
| 361 | * @see android.os.Handler#Handler() |
| 362 | * |
| 363 | * @param context the application's context |
| 364 | * @param listener the listener invoked for all the callbacks, this must |
| 365 | * not be null. |
| 366 | * @param handler the handler to use |
| 367 | * @param ignoreMultitouch whether events involving more than one pointer should |
| 368 | * be ignored. |
| 369 | * |
| 370 | * @throws NullPointerException if {@code listener} is null. |
| 371 | */ |
| 372 | public GestureDetector(Context context, OnGestureListener listener, Handler handler, |
| 373 | boolean ignoreMultitouch) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 374 | if (handler != null) { |
| 375 | mHandler = new GestureHandler(handler); |
| 376 | } else { |
| 377 | mHandler = new GestureHandler(); |
| 378 | } |
| 379 | mListener = listener; |
| 380 | if (listener instanceof OnDoubleTapListener) { |
| 381 | setOnDoubleTapListener((OnDoubleTapListener) listener); |
| 382 | } |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 383 | init(context, ignoreMultitouch); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 384 | } |
| 385 | |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 386 | private void init(Context context, boolean ignoreMultitouch) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 387 | if (mListener == null) { |
| 388 | throw new NullPointerException("OnGestureListener must not be null"); |
| 389 | } |
| 390 | mIsLongpressEnabled = true; |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 391 | mIgnoreMultitouch = ignoreMultitouch; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 392 | |
| 393 | // Fallback to support pre-donuts releases |
| 394 | int touchSlop, doubleTapSlop; |
| 395 | if (context == null) { |
| 396 | //noinspection deprecation |
| 397 | touchSlop = ViewConfiguration.getTouchSlop(); |
| 398 | doubleTapSlop = ViewConfiguration.getDoubleTapSlop(); |
| 399 | //noinspection deprecation |
| 400 | mMinimumFlingVelocity = ViewConfiguration.getMinimumFlingVelocity(); |
Romain Guy | 4296fc4 | 2009-07-06 11:48:52 -0700 | [diff] [blame] | 401 | mMaximumFlingVelocity = ViewConfiguration.getMaximumFlingVelocity(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 402 | } else { |
| 403 | final ViewConfiguration configuration = ViewConfiguration.get(context); |
| 404 | touchSlop = configuration.getScaledTouchSlop(); |
| 405 | doubleTapSlop = configuration.getScaledDoubleTapSlop(); |
| 406 | mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity(); |
Romain Guy | 4296fc4 | 2009-07-06 11:48:52 -0700 | [diff] [blame] | 407 | mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 408 | } |
| 409 | mTouchSlopSquare = touchSlop * touchSlop; |
| 410 | mDoubleTapSlopSquare = doubleTapSlop * doubleTapSlop; |
| 411 | } |
| 412 | |
| 413 | /** |
| 414 | * Sets the listener which will be called for double-tap and related |
| 415 | * gestures. |
| 416 | * |
| 417 | * @param onDoubleTapListener the listener invoked for all the callbacks, or |
| 418 | * null to stop listening for double-tap gestures. |
| 419 | */ |
| 420 | public void setOnDoubleTapListener(OnDoubleTapListener onDoubleTapListener) { |
| 421 | mDoubleTapListener = onDoubleTapListener; |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * Set whether longpress is enabled, if this is enabled when a user |
| 426 | * presses and holds down you get a longpress event and nothing further. |
| 427 | * If it's disabled the user can press and hold down and then later |
| 428 | * moved their finger and you will get scroll events. By default |
| 429 | * longpress is enabled. |
| 430 | * |
| 431 | * @param isLongpressEnabled whether longpress should be enabled. |
| 432 | */ |
| 433 | public void setIsLongpressEnabled(boolean isLongpressEnabled) { |
| 434 | mIsLongpressEnabled = isLongpressEnabled; |
| 435 | } |
| 436 | |
| 437 | /** |
| 438 | * @return true if longpress is enabled, else false. |
| 439 | */ |
| 440 | public boolean isLongpressEnabled() { |
| 441 | return mIsLongpressEnabled; |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * Analyzes the given motion event and if applicable triggers the |
| 446 | * appropriate callbacks on the {@link OnGestureListener} supplied. |
| 447 | * |
| 448 | * @param ev The current motion event. |
| 449 | * @return true if the {@link OnGestureListener} consumed the event, |
| 450 | * else false. |
| 451 | */ |
| 452 | public boolean onTouchEvent(MotionEvent ev) { |
Jeff Brown | 21bc5c9 | 2011-02-28 18:27:14 -0800 | [diff] [blame] | 453 | if (mInputEventConsistencyVerifier != null) { |
| 454 | mInputEventConsistencyVerifier.onTouchEvent(ev, 0); |
| 455 | } |
| 456 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 457 | final int action = ev.getAction(); |
| 458 | final float y = ev.getY(); |
| 459 | final float x = ev.getX(); |
| 460 | |
| 461 | if (mVelocityTracker == null) { |
| 462 | mVelocityTracker = VelocityTracker.obtain(); |
| 463 | } |
| 464 | mVelocityTracker.addMovement(ev); |
| 465 | |
| 466 | boolean handled = false; |
| 467 | |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 468 | switch (action & MotionEvent.ACTION_MASK) { |
| 469 | case MotionEvent.ACTION_POINTER_DOWN: |
| 470 | if (mIgnoreMultitouch) { |
| 471 | // Multitouch event - abort. |
| 472 | cancel(); |
| 473 | } |
| 474 | break; |
| 475 | |
| 476 | case MotionEvent.ACTION_POINTER_UP: |
| 477 | // Ending a multitouch gesture and going back to 1 finger |
| 478 | if (mIgnoreMultitouch && ev.getPointerCount() == 2) { |
Dianne Hackborn | b125dc5 | 2010-02-12 15:52:09 -0800 | [diff] [blame] | 479 | int index = (((action & MotionEvent.ACTION_POINTER_INDEX_MASK) |
| 480 | >> MotionEvent.ACTION_POINTER_INDEX_SHIFT) == 0) ? 1 : 0; |
| 481 | mLastMotionX = ev.getX(index); |
| 482 | mLastMotionY = ev.getY(index); |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 483 | mVelocityTracker.recycle(); |
| 484 | mVelocityTracker = VelocityTracker.obtain(); |
| 485 | } |
| 486 | break; |
| 487 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 488 | case MotionEvent.ACTION_DOWN: |
| 489 | if (mDoubleTapListener != null) { |
| 490 | boolean hadTapMessage = mHandler.hasMessages(TAP); |
| 491 | if (hadTapMessage) mHandler.removeMessages(TAP); |
| 492 | if ((mCurrentDownEvent != null) && (mPreviousUpEvent != null) && hadTapMessage && |
| 493 | isConsideredDoubleTap(mCurrentDownEvent, mPreviousUpEvent, ev)) { |
| 494 | // This is a second tap |
| 495 | mIsDoubleTapping = true; |
| 496 | // Give a callback with the first tap of the double-tap |
| 497 | handled |= mDoubleTapListener.onDoubleTap(mCurrentDownEvent); |
| 498 | // Give a callback with down event of the double-tap |
| 499 | handled |= mDoubleTapListener.onDoubleTapEvent(ev); |
| 500 | } else { |
| 501 | // This is a first tap |
| 502 | mHandler.sendEmptyMessageDelayed(TAP, DOUBLE_TAP_TIMEOUT); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | mLastMotionX = x; |
| 507 | mLastMotionY = y; |
Adam Powell | 45f2ca7 | 2010-02-18 11:35:13 -0800 | [diff] [blame] | 508 | if (mCurrentDownEvent != null) { |
| 509 | mCurrentDownEvent.recycle(); |
| 510 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 511 | mCurrentDownEvent = MotionEvent.obtain(ev); |
| 512 | mAlwaysInTapRegion = true; |
| 513 | mAlwaysInBiggerTapRegion = true; |
| 514 | mStillDown = true; |
| 515 | mInLongPress = false; |
| 516 | |
| 517 | if (mIsLongpressEnabled) { |
| 518 | mHandler.removeMessages(LONG_PRESS); |
| 519 | mHandler.sendEmptyMessageAtTime(LONG_PRESS, mCurrentDownEvent.getDownTime() |
| 520 | + TAP_TIMEOUT + LONGPRESS_TIMEOUT); |
| 521 | } |
| 522 | mHandler.sendEmptyMessageAtTime(SHOW_PRESS, mCurrentDownEvent.getDownTime() + TAP_TIMEOUT); |
| 523 | handled |= mListener.onDown(ev); |
| 524 | break; |
| 525 | |
| 526 | case MotionEvent.ACTION_MOVE: |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 527 | if (mInLongPress || (mIgnoreMultitouch && ev.getPointerCount() > 1)) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 528 | break; |
| 529 | } |
| 530 | final float scrollX = mLastMotionX - x; |
| 531 | final float scrollY = mLastMotionY - y; |
| 532 | if (mIsDoubleTapping) { |
| 533 | // Give the move events of the double-tap |
| 534 | handled |= mDoubleTapListener.onDoubleTapEvent(ev); |
| 535 | } else if (mAlwaysInTapRegion) { |
| 536 | final int deltaX = (int) (x - mCurrentDownEvent.getX()); |
| 537 | final int deltaY = (int) (y - mCurrentDownEvent.getY()); |
| 538 | int distance = (deltaX * deltaX) + (deltaY * deltaY); |
| 539 | if (distance > mTouchSlopSquare) { |
| 540 | handled = mListener.onScroll(mCurrentDownEvent, ev, scrollX, scrollY); |
| 541 | mLastMotionX = x; |
| 542 | mLastMotionY = y; |
| 543 | mAlwaysInTapRegion = false; |
| 544 | mHandler.removeMessages(TAP); |
| 545 | mHandler.removeMessages(SHOW_PRESS); |
| 546 | mHandler.removeMessages(LONG_PRESS); |
| 547 | } |
| 548 | if (distance > mBiggerTouchSlopSquare) { |
| 549 | mAlwaysInBiggerTapRegion = false; |
| 550 | } |
| 551 | } else if ((Math.abs(scrollX) >= 1) || (Math.abs(scrollY) >= 1)) { |
| 552 | handled = mListener.onScroll(mCurrentDownEvent, ev, scrollX, scrollY); |
| 553 | mLastMotionX = x; |
| 554 | mLastMotionY = y; |
| 555 | } |
| 556 | break; |
| 557 | |
| 558 | case MotionEvent.ACTION_UP: |
| 559 | mStillDown = false; |
| 560 | MotionEvent currentUpEvent = MotionEvent.obtain(ev); |
| 561 | if (mIsDoubleTapping) { |
| 562 | // Finally, give the up event of the double-tap |
| 563 | handled |= mDoubleTapListener.onDoubleTapEvent(ev); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 564 | } else if (mInLongPress) { |
| 565 | mHandler.removeMessages(TAP); |
| 566 | mInLongPress = false; |
The Android Open Source Project | f5b4b98 | 2009-03-05 20:00:43 -0800 | [diff] [blame] | 567 | } else if (mAlwaysInTapRegion) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 568 | handled = mListener.onSingleTapUp(ev); |
| 569 | } else { |
| 570 | |
| 571 | // A fling must travel the minimum tap distance |
| 572 | final VelocityTracker velocityTracker = mVelocityTracker; |
Romain Guy | 4296fc4 | 2009-07-06 11:48:52 -0700 | [diff] [blame] | 573 | velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 574 | final float velocityY = velocityTracker.getYVelocity(); |
| 575 | final float velocityX = velocityTracker.getXVelocity(); |
| 576 | |
| 577 | if ((Math.abs(velocityY) > mMinimumFlingVelocity) |
| 578 | || (Math.abs(velocityX) > mMinimumFlingVelocity)){ |
Adam Powell | 45f2ca7 | 2010-02-18 11:35:13 -0800 | [diff] [blame] | 579 | handled = mListener.onFling(mCurrentDownEvent, ev, velocityX, velocityY); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 580 | } |
| 581 | } |
Adam Powell | 45f2ca7 | 2010-02-18 11:35:13 -0800 | [diff] [blame] | 582 | if (mPreviousUpEvent != null) { |
| 583 | mPreviousUpEvent.recycle(); |
| 584 | } |
| 585 | // Hold the event we obtained above - listeners may have changed the original. |
| 586 | mPreviousUpEvent = currentUpEvent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 587 | mVelocityTracker.recycle(); |
| 588 | mVelocityTracker = null; |
The Android Open Source Project | b2a3dd8 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 589 | mIsDoubleTapping = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 590 | mHandler.removeMessages(SHOW_PRESS); |
| 591 | mHandler.removeMessages(LONG_PRESS); |
| 592 | break; |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 593 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 594 | case MotionEvent.ACTION_CANCEL: |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 595 | cancel(); |
Jeff Brown | bbdc50b | 2011-04-19 23:46:52 -0700 | [diff] [blame] | 596 | break; |
| 597 | } |
| 598 | |
| 599 | if (!handled && mInputEventConsistencyVerifier != null) { |
| 600 | mInputEventConsistencyVerifier.onUnhandledEvent(ev, 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 601 | } |
| 602 | return handled; |
| 603 | } |
| 604 | |
Adam Powell | 216bccf | 2010-02-01 15:03:17 -0800 | [diff] [blame] | 605 | private void cancel() { |
| 606 | mHandler.removeMessages(SHOW_PRESS); |
| 607 | mHandler.removeMessages(LONG_PRESS); |
| 608 | mHandler.removeMessages(TAP); |
| 609 | mVelocityTracker.recycle(); |
| 610 | mVelocityTracker = null; |
| 611 | mIsDoubleTapping = false; |
| 612 | mStillDown = false; |
| 613 | if (mInLongPress) { |
| 614 | mInLongPress = false; |
| 615 | } |
| 616 | } |
| 617 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 618 | private boolean isConsideredDoubleTap(MotionEvent firstDown, MotionEvent firstUp, |
| 619 | MotionEvent secondDown) { |
| 620 | if (!mAlwaysInBiggerTapRegion) { |
| 621 | return false; |
| 622 | } |
| 623 | |
| 624 | if (secondDown.getEventTime() - firstUp.getEventTime() > DOUBLE_TAP_TIMEOUT) { |
| 625 | return false; |
| 626 | } |
| 627 | |
| 628 | int deltaX = (int) firstDown.getX() - (int) secondDown.getX(); |
| 629 | int deltaY = (int) firstDown.getY() - (int) secondDown.getY(); |
| 630 | return (deltaX * deltaX + deltaY * deltaY < mDoubleTapSlopSquare); |
| 631 | } |
| 632 | |
| 633 | private void dispatchLongPress() { |
| 634 | mHandler.removeMessages(TAP); |
| 635 | mInLongPress = true; |
| 636 | mListener.onLongPress(mCurrentDownEvent); |
| 637 | } |
| 638 | } |