ViewDataBinding.java revision ed6428586a939e00d9e66314d5cf1056ad48767e
1/* 2 * Copyright (C) 2014 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 17package android.databinding; 18 19import com.android.databinding.library.R; 20 21import android.annotation.TargetApi; 22import android.databinding.CallbackRegistry.NotifierCallback; 23import android.os.Build.VERSION; 24import android.os.Build.VERSION_CODES; 25import android.text.TextUtils; 26import android.util.SparseIntArray; 27import android.view.View; 28import android.view.View.OnAttachStateChangeListener; 29import android.view.ViewGroup; 30 31import java.lang.ref.WeakReference; 32 33public abstract class ViewDataBinding { 34 35 /** 36 * Instead of directly accessing Build.VERSION.SDK_INT, generated code uses this value so that 37 * we can test API dependent behavior. 38 */ 39 static int SDK_INT = VERSION.SDK_INT; 40 41 private static final int REBIND = 1; 42 private static final int HALTED = 2; 43 private static final int REBOUND = 3; 44 45 /** 46 * Prefix for android:tag on Views with binding. The root View and include tags will not have 47 * android:tag attributes and will use ids instead. 48 */ 49 public static final String BINDING_TAG_PREFIX = "binding_"; 50 51 // The length of BINDING_TAG_PREFIX prevents calling length repeatedly. 52 private static final int BINDING_NUMBER_START = BINDING_TAG_PREFIX.length(); 53 54 // ICS (v 14) fixes a leak when using setTag(int, Object) 55 private static final boolean USE_TAG_ID = DataBinderMapper.TARGET_MIN_SDK >= 14; 56 57 /** 58 * Method object extracted out to attach a listener to a bound Observable object. 59 */ 60 private static final CreateWeakListener CREATE_PROPERTY_LISTENER = new CreateWeakListener() { 61 @Override 62 public WeakListener create(ViewDataBinding viewDataBinding, int localFieldId) { 63 return new WeakPropertyListener(viewDataBinding, localFieldId); 64 } 65 }; 66 67 /** 68 * Method object extracted out to attach a listener to a bound ObservableList object. 69 */ 70 private static final CreateWeakListener CREATE_LIST_LISTENER = new CreateWeakListener() { 71 @Override 72 public WeakListener create(ViewDataBinding viewDataBinding, int localFieldId) { 73 return new WeakListListener(viewDataBinding, localFieldId); 74 } 75 }; 76 77 /** 78 * Method object extracted out to attach a listener to a bound ObservableMap object. 79 */ 80 private static final CreateWeakListener CREATE_MAP_LISTENER = new CreateWeakListener() { 81 @Override 82 public WeakListener create(ViewDataBinding viewDataBinding, int localFieldId) { 83 return new WeakMapListener(viewDataBinding, localFieldId); 84 } 85 }; 86 87 private static final CallbackRegistry.NotifierCallback<OnRebindCallback, ViewDataBinding, Void> 88 REBIND_NOTIFIER = new NotifierCallback<OnRebindCallback, ViewDataBinding, Void>() { 89 @Override 90 public void onNotifyCallback(OnRebindCallback callback, ViewDataBinding sender, int mode, 91 Void arg2) { 92 switch (mode) { 93 case REBIND: 94 if (!callback.onPreBind(sender)) { 95 sender.mRebindHalted = true; 96 } 97 break; 98 case HALTED: 99 callback.onCanceled(sender); 100 break; 101 case REBOUND: 102 callback.onBound(sender); 103 break; 104 } 105 } 106 }; 107 108 private static final OnAttachStateChangeListener ROOT_REATTACHED_LISTENER; 109 110 static { 111 if (VERSION.SDK_INT < VERSION_CODES.KITKAT) { 112 ROOT_REATTACHED_LISTENER = null; 113 } else { 114 ROOT_REATTACHED_LISTENER = new OnAttachStateChangeListener() { 115 @TargetApi(VERSION_CODES.KITKAT) 116 @Override 117 public void onViewAttachedToWindow(View v) { 118 // execute the pending bindings. 119 final ViewDataBinding binding; 120 if (USE_TAG_ID) { 121 binding = (ViewDataBinding) v.getTag(R.id.dataBinding); 122 } else { 123 binding = (ViewDataBinding) v.getTag(); 124 } 125 v.post(binding.mRebindRunnable); 126 v.removeOnAttachStateChangeListener(this); 127 } 128 129 @Override 130 public void onViewDetachedFromWindow(View v) { 131 } 132 }; 133 } 134 } 135 136 /** 137 * Runnable executed on animation heartbeat to rebind the dirty Views. 138 */ 139 private Runnable mRebindRunnable = new Runnable() { 140 @Override 141 public void run() { 142 synchronized (this) { 143 mPendingRebind = false; 144 } 145 if (VERSION.SDK_INT >= VERSION_CODES.KITKAT) { 146 // Nested so that we don't get a lint warning in IntelliJ 147 if (!mRoot.isAttachedToWindow()) { 148 // Don't execute the pending bindings until the View 149 // is attached again. 150 mRoot.removeOnAttachStateChangeListener(ROOT_REATTACHED_LISTENER); 151 mRoot.addOnAttachStateChangeListener(ROOT_REATTACHED_LISTENER); 152 return; 153 } 154 } 155 executePendingBindings(); 156 } 157 }; 158 159 /** 160 * Flag indicates that there are pending bindings that need to be reevaluated. 161 */ 162 private boolean mPendingRebind = false; 163 164 /** 165 * Indicates that a onPreBind has stopped the executePendingBindings call. 166 */ 167 private boolean mRebindHalted = false; 168 169 /** 170 * The observed expressions. 171 */ 172 private WeakListener[] mLocalFieldObservers; 173 174 /** 175 * The root View that this Binding is associated with. 176 */ 177 private final View mRoot; 178 179 /** 180 * The collection of OnRebindCallbacks. 181 */ 182 private CallbackRegistry<OnRebindCallback, ViewDataBinding, Void> mRebindCallbacks; 183 184 /** 185 * Flag to prevent reentrant executePendingBinding calls. 186 */ 187 private boolean mIsExecutingPendingBindings; 188 189 protected ViewDataBinding(View root, int localFieldCount) { 190 mLocalFieldObservers = new WeakListener[localFieldCount]; 191 this.mRoot = root; 192 } 193 194 protected void setRootTag(View view) { 195 if (USE_TAG_ID) { 196 view.setTag(R.id.dataBinding, this); 197 } else { 198 view.setTag(this); 199 } 200 } 201 202 protected void setRootTag(View[] views) { 203 if (USE_TAG_ID) { 204 for (View view : views) { 205 view.setTag(R.id.dataBinding, this); 206 } 207 } else { 208 for (View view : views) { 209 view.setTag(this); 210 } 211 } 212 } 213 214 public static int getBuildSdkInt() { 215 return SDK_INT; 216 } 217 218 /** 219 * Called when an observed object changes. Sets the appropriate dirty flag if applicable. 220 * @param localFieldId The index into mLocalFieldObservers that this Object resides in. 221 * @param object The object that has changed. 222 * @param fieldId The BR ID of the field being changed or _all if 223 * no specific field is being notified. 224 * @return true if this change should cause a change to the UI. 225 */ 226 protected abstract boolean onFieldChange(int localFieldId, Object object, int fieldId); 227 228 /** 229 * Set a value value in the Binding class. 230 * <p> 231 * Typically, the developer will be able to call the subclass's set method directly. For 232 * example, if there is a variable <code>x</code> in the Binding, a <code>setX</code> method 233 * will be generated. However, there are times when the specific subclass of ViewDataBinding 234 * is unknown, so the generated method cannot be discovered without reflection. The 235 * setVariable call allows the values of variables to be set without reflection. 236 * 237 * @param variableId the BR id of the variable to be set. For example, if the variable is 238 * <code>x</code>, then variableId will be <code>BR.x</code>. 239 * @param value The new value of the variable to be set. 240 * @return <code>true</code> if the variable exists in the binding or <code>false</code> 241 * otherwise. 242 */ 243 public abstract boolean setVariable(int variableId, Object value); 244 245 /** 246 * Add a listener to be called when reevaluating dirty fields. This also allows automatic 247 * updates to be halted, but does not stop explicit calls to {@link #executePendingBindings()}. 248 * 249 * @param listener The listener to add. 250 */ 251 public void addOnRebindCallback(OnRebindCallback listener) { 252 if (mRebindCallbacks == null) { 253 mRebindCallbacks = new CallbackRegistry<OnRebindCallback, ViewDataBinding, Void>(REBIND_NOTIFIER); 254 } 255 mRebindCallbacks.add(listener); 256 } 257 258 /** 259 * Removes a listener that was added in {@link #addOnRebindCallback(OnRebindCallback)}. 260 * 261 * @param listener The listener to remove. 262 */ 263 public void removeOnRebindCallback(OnRebindCallback listener) { 264 if (mRebindCallbacks != null) { 265 mRebindCallbacks.remove(listener); 266 } 267 } 268 269 /** 270 * Evaluates the pending bindings, updating any Views that have expressions bound to 271 * modified variables. This <b>must</b> be run on the UI thread. 272 */ 273 public void executePendingBindings() { 274 if (mIsExecutingPendingBindings) { 275 requestRebind(); 276 return; 277 } 278 mIsExecutingPendingBindings = true; 279 mRebindHalted = false; 280 if (mRebindCallbacks != null) { 281 mRebindCallbacks.notifyCallbacks(this, REBIND, null); 282 283 // The onRebindListeners will change mPendingHalted 284 if (mRebindHalted) { 285 mRebindCallbacks.notifyCallbacks(this, HALTED, null); 286 } 287 } 288 if (!mRebindHalted) { 289 executeBindings(); 290 if (mRebindCallbacks != null) { 291 mRebindCallbacks.notifyCallbacks(this, REBOUND, null); 292 } 293 } 294 mIsExecutingPendingBindings = false; 295 } 296 297 void forceExecuteBindings() { 298 executeBindings(); 299 } 300 301 protected abstract void executeBindings(); 302 303 /** 304 * Used internally to invalidate flags of included layouts. 305 */ 306 public abstract void invalidateAll(); 307 308 /** 309 * Removes binding listeners to expression variables. 310 */ 311 public void unbind() { 312 for (WeakListener weakListener : mLocalFieldObservers) { 313 if (weakListener != null) { 314 weakListener.unregister(); 315 } 316 } 317 } 318 319 @Override 320 protected void finalize() throws Throwable { 321 unbind(); 322 } 323 324 static ViewDataBinding getBinding(View v) { 325 if (USE_TAG_ID) { 326 return (ViewDataBinding) v.getTag(R.id.dataBinding); 327 } else { 328 final Object tag = v.getTag(); 329 if (tag instanceof ViewDataBinding) { 330 return (ViewDataBinding) tag; 331 } 332 } 333 return null; 334 } 335 336 /** 337 * Returns the outermost View in the layout file associated with the Binding. 338 * @return the outermost View in the layout file associated with the Binding. 339 */ 340 public View getRoot() { 341 return mRoot; 342 } 343 344 private void handleFieldChange(int mLocalFieldId, Object object, int fieldId) { 345 boolean result = onFieldChange(mLocalFieldId, object, fieldId); 346 if (result) { 347 requestRebind(); 348 } 349 } 350 351 protected boolean unregisterFrom(int localFieldId) { 352 WeakListener listener = mLocalFieldObservers[localFieldId]; 353 if (listener != null) { 354 return listener.unregister(); 355 } 356 return false; 357 } 358 359 protected void requestRebind() { 360 synchronized (this) { 361 if (mPendingRebind) { 362 return; 363 } 364 mPendingRebind = true; 365 } 366 if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) { 367 mRoot.postOnAnimation(mRebindRunnable); 368 } else { 369 mRoot.post(mRebindRunnable); 370 } 371 } 372 373 protected Object getObservedField(int localFieldId) { 374 WeakListener listener = mLocalFieldObservers[localFieldId]; 375 if (listener == null) { 376 return null; 377 } 378 return listener.getTarget(); 379 } 380 381 private boolean updateRegistration(int localFieldId, Object observable, 382 CreateWeakListener listenerCreator) { 383 if (observable == null) { 384 return unregisterFrom(localFieldId); 385 } 386 WeakListener listener = mLocalFieldObservers[localFieldId]; 387 if (listener == null) { 388 registerTo(localFieldId, observable, listenerCreator); 389 return true; 390 } 391 if (listener.getTarget() == observable) { 392 return false;//nothing to do, same object 393 } 394 unregisterFrom(localFieldId); 395 registerTo(localFieldId, observable, listenerCreator); 396 return true; 397 } 398 399 protected boolean updateRegistration(int localFieldId, Observable observable) { 400 return updateRegistration(localFieldId, observable, CREATE_PROPERTY_LISTENER); 401 } 402 403 protected boolean updateRegistration(int localFieldId, ObservableList observable) { 404 return updateRegistration(localFieldId, observable, CREATE_LIST_LISTENER); 405 } 406 407 protected boolean updateRegistration(int localFieldId, ObservableMap observable) { 408 return updateRegistration(localFieldId, observable, CREATE_MAP_LISTENER); 409 } 410 411 protected void registerTo(int localFieldId, Object observable, 412 CreateWeakListener listenerCreator) { 413 if (observable == null) { 414 return; 415 } 416 WeakListener listener = mLocalFieldObservers[localFieldId]; 417 if (listener == null) { 418 listener = listenerCreator.create(this, localFieldId); 419 mLocalFieldObservers[localFieldId] = listener; 420 } 421 listener.setTarget(observable); 422 } 423 424 protected static ViewDataBinding bind(View view, int layoutId) { 425 return DataBindingUtil.bind(view, layoutId); 426 } 427 428 /** 429 * Walks the view hierarchy under root and pulls out tagged Views, includes, and views with 430 * IDs into an Object[] that is returned. This is used to walk the view hierarchy once to find 431 * all bound and ID'd views. 432 * 433 * @param root The root of the view hierarchy to walk. 434 * @param numBindings The total number of ID'd views, views with expressions, and includes 435 * @param includes The include layout information, indexed by their container's index. 436 * @param viewsWithIds Indexes of views that don't have tags, but have IDs. 437 * @return An array of size numBindings containing all Views in the hierarchy that have IDs 438 * (with elements in viewsWithIds), are tagged containing expressions, or the bindings for 439 * included layouts. 440 */ 441 protected static Object[] mapBindings(View root, int numBindings, 442 IncludedLayoutIndex[][] includes, SparseIntArray viewsWithIds) { 443 Object[] bindings = new Object[numBindings]; 444 mapBindings(root, bindings, includes, viewsWithIds, true); 445 return bindings; 446 } 447 448 /** 449 * Walks the view hierarchy under roots and pulls out tagged Views, includes, and views with 450 * IDs into an Object[] that is returned. This is used to walk the view hierarchy once to find 451 * all bound and ID'd views. 452 * 453 * @param roots The root Views of the view hierarchy to walk. This is used with merge tags. 454 * @param numBindings The total number of ID'd views, views with expressions, and includes 455 * @param includes The include layout information, indexed by their container's index. 456 * @param viewsWithIds Indexes of views that don't have tags, but have IDs. 457 * @return An array of size numBindings containing all Views in the hierarchy that have IDs 458 * (with elements in viewsWithIds), are tagged containing expressions, or the bindings for 459 * included layouts. 460 */ 461 protected static Object[] mapBindings(View[] roots, int numBindings, 462 IncludedLayoutIndex[][] includes, SparseIntArray viewsWithIds) { 463 Object[] bindings = new Object[numBindings]; 464 for (int i = 0; i < roots.length; i++) { 465 mapBindings(roots[i], bindings, includes, viewsWithIds, true); 466 } 467 return bindings; 468 } 469 470 private static void mapBindings(View view, Object[] bindings, 471 IncludedLayoutIndex[][] includes, SparseIntArray viewsWithIds, boolean isRoot) { 472 final IncludedLayoutIndex[] includedLayoutIndexes; 473 final String tag = (String) view.getTag(); 474 boolean isBound = false; 475 if (isRoot && tag != null && tag.startsWith("layout")) { 476 final int underscoreIndex = tag.lastIndexOf('_'); 477 if (underscoreIndex > 0 && isNumeric(tag, underscoreIndex + 1)) { 478 final int index = parseTagInt(tag, underscoreIndex + 1); 479 bindings[index] = view; 480 includedLayoutIndexes = includes == null ? null : includes[index]; 481 isBound = true; 482 } else { 483 includedLayoutIndexes = null; 484 } 485 } else if (tag != null && tag.startsWith(BINDING_TAG_PREFIX)) { 486 int tagIndex = parseTagInt(tag, BINDING_NUMBER_START); 487 bindings[tagIndex] = view; 488 isBound = true; 489 includedLayoutIndexes = includes == null ? null : includes[tagIndex]; 490 } else { 491 // Not a bound view 492 includedLayoutIndexes = null; 493 } 494 if (!isBound) { 495 final int id = view.getId(); 496 if (id > 0) { 497 int index; 498 if (viewsWithIds != null && (index = viewsWithIds.get(id, -1)) >= 0) { 499 bindings[index] = view; 500 } 501 } 502 } 503 504 if (view instanceof ViewGroup) { 505 final ViewGroup viewGroup = (ViewGroup) view; 506 final int count = viewGroup.getChildCount(); 507 int minInclude = 0; 508 for (int i = 0; i < count; i++) { 509 final View child = viewGroup.getChildAt(i); 510 boolean isInclude = false; 511 if (includedLayoutIndexes != null) { 512 String childTag = (String) child.getTag(); 513 if (childTag != null && childTag.endsWith("_0") && 514 childTag.startsWith("layout") && childTag.indexOf('/') > 0) { 515 // This *could* be an include. Test against the expected includes. 516 int includeIndex = findIncludeIndex(childTag, minInclude, 517 includedLayoutIndexes); 518 if (includeIndex >= 0) { 519 isInclude = true; 520 minInclude = includeIndex + 1; 521 IncludedLayoutIndex include = includedLayoutIndexes[includeIndex]; 522 int lastMatchingIndex = findLastMatching(viewGroup, i); 523 if (lastMatchingIndex == i) { 524 bindings[include.index] = DataBindingUtil.bind(child, 525 include.layoutId); 526 } else { 527 final int includeCount = lastMatchingIndex - i + 1; 528 final View[] included = new View[includeCount]; 529 for (int j = 0; j < includeCount; j++) { 530 included[j] = viewGroup.getChildAt(i + j); 531 } 532 bindings[include.index] = DataBindingUtil.bind(included, 533 include.layoutId); 534 i += includeCount - 1; 535 } 536 } 537 } 538 } 539 if (!isInclude) { 540 mapBindings(child, bindings, includes, viewsWithIds, false); 541 } 542 } 543 } 544 } 545 546 private static int findIncludeIndex(String tag, int minInclude, 547 IncludedLayoutIndex[] layoutIndexes) { 548 final int slashIndex = tag.indexOf('/'); 549 final CharSequence layoutName = tag.subSequence(slashIndex + 1, tag.length() - 2); 550 551 final int length = layoutIndexes.length; 552 for (int i = minInclude; i < length; i++) { 553 final IncludedLayoutIndex layoutIndex = layoutIndexes[i]; 554 if (TextUtils.equals(layoutName, layoutIndex.layout)) { 555 return i; 556 } 557 } 558 return -1; 559 } 560 561 private static int findLastMatching(ViewGroup viewGroup, int firstIncludedIndex) { 562 final View firstView = viewGroup.getChildAt(firstIncludedIndex); 563 final String firstViewTag = (String) firstView.getTag(); 564 final String tagBase = firstViewTag.substring(0, firstViewTag.length() - 1); // don't include the "0" 565 final int tagSequenceIndex = tagBase.length(); 566 567 final int count = viewGroup.getChildCount(); 568 int max = firstIncludedIndex; 569 for (int i = firstIncludedIndex + 1; i < count; i++) { 570 final View view = viewGroup.getChildAt(i); 571 final String tag = (String) view.getTag(); 572 if (tag != null && tag.startsWith(tagBase)) { 573 if (tag.length() == firstViewTag.length() && tag.charAt(tag.length() - 1) == '0') { 574 return max; // Found another instance of the include 575 } 576 if (isNumeric(tag, tagSequenceIndex)) { 577 max = i; 578 } 579 } 580 } 581 return max; 582 } 583 584 private static boolean isNumeric(String tag, int startIndex) { 585 int length = tag.length(); 586 if (length == startIndex) { 587 return false; // no numerals 588 } 589 for (int i = startIndex; i < length; i++) { 590 if (!Character.isDigit(tag.charAt(i))) { 591 return false; 592 } 593 } 594 return true; 595 } 596 597 /** 598 * Parse the tag without creating a new String object. This is fast and assumes the 599 * tag is in the correct format. 600 * @param str The tag string. 601 * @return The binding tag number parsed from the tag string. 602 */ 603 private static int parseTagInt(String str, int startIndex) { 604 final int end = str.length(); 605 int val = 0; 606 for (int i = startIndex; i < end; i++) { 607 val *= 10; 608 char c = str.charAt(i); 609 val += (c - '0'); 610 } 611 return val; 612 } 613 614 private static abstract class WeakListener<T> { 615 private final WeakReference<ViewDataBinding> mBinder; 616 protected final int mLocalFieldId; 617 private T mTarget; 618 619 public WeakListener(ViewDataBinding binder, int localFieldId) { 620 mBinder = new WeakReference<ViewDataBinding>(binder); 621 mLocalFieldId = localFieldId; 622 } 623 624 public void setTarget(T object) { 625 unregister(); 626 mTarget = object; 627 if (mTarget != null) { 628 addListener(mTarget); 629 } 630 } 631 632 public boolean unregister() { 633 boolean unregistered = false; 634 if (mTarget != null) { 635 removeListener(mTarget); 636 unregistered = true; 637 } 638 mTarget = null; 639 return unregistered; 640 } 641 642 public T getTarget() { 643 return mTarget; 644 } 645 646 protected ViewDataBinding getBinder() { 647 ViewDataBinding binder = mBinder.get(); 648 if (binder == null) { 649 unregister(); // The binder is dead 650 } 651 return binder; 652 } 653 654 protected abstract void addListener(T target); 655 protected abstract void removeListener(T target); 656 } 657 658 private static class WeakPropertyListener extends WeakListener<Observable> 659 implements OnPropertyChangedListener { 660 public WeakPropertyListener(ViewDataBinding binder, int localFieldId) { 661 super(binder, localFieldId); 662 } 663 664 @Override 665 protected void addListener(Observable target) { 666 target.addOnPropertyChangedListener(this); 667 } 668 669 @Override 670 protected void removeListener(Observable target) { 671 target.removeOnPropertyChangedListener(this); 672 } 673 674 @Override 675 public void onPropertyChanged(Observable sender, int fieldId) { 676 ViewDataBinding binder = getBinder(); 677 if (binder == null) { 678 return; 679 } 680 Observable obj = getTarget(); 681 if (obj != sender) { 682 return; // notification from the wrong object? 683 } 684 binder.handleFieldChange(mLocalFieldId, sender, fieldId); 685 } 686 } 687 688 private static class WeakListListener extends WeakListener<ObservableList> 689 implements OnListChangedListener { 690 691 public WeakListListener(ViewDataBinding binder, int localFieldId) { 692 super(binder, localFieldId); 693 } 694 695 @Override 696 public void onChanged() { 697 ViewDataBinding binder = getBinder(); 698 if (binder == null) { 699 return; 700 } 701 ObservableList target = getTarget(); 702 if (target == null) { 703 return; // We don't expect any notifications from null targets 704 } 705 binder.handleFieldChange(mLocalFieldId, target, 0); 706 } 707 708 @Override 709 public void onItemRangeChanged(int positionStart, int itemCount) { 710 onChanged(); 711 } 712 713 @Override 714 public void onItemRangeInserted(int positionStart, int itemCount) { 715 onChanged(); 716 } 717 718 @Override 719 public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) { 720 onChanged(); 721 } 722 723 @Override 724 public void onItemRangeRemoved(int positionStart, int itemCount) { 725 onChanged(); 726 } 727 728 @Override 729 protected void addListener(ObservableList target) { 730 target.addOnListChangedListener(this); 731 } 732 733 @Override 734 protected void removeListener(ObservableList target) { 735 target.removeOnListChangedListener(this); 736 } 737 } 738 739 private static class WeakMapListener extends WeakListener<ObservableMap> 740 implements OnMapChangedListener { 741 public WeakMapListener(ViewDataBinding binder, int localFieldId) { 742 super(binder, localFieldId); 743 } 744 745 @Override 746 protected void addListener(ObservableMap target) { 747 target.addOnMapChangedListener(this); 748 } 749 750 @Override 751 protected void removeListener(ObservableMap target) { 752 target.removeOnMapChangedListener(this); 753 } 754 755 @Override 756 public void onMapChanged(ObservableMap sender, Object key) { 757 ViewDataBinding binder = getBinder(); 758 if (binder == null || sender != getTarget()) { 759 return; 760 } 761 binder.handleFieldChange(mLocalFieldId, sender, 0); 762 } 763 } 764 765 private interface CreateWeakListener { 766 WeakListener create(ViewDataBinding viewDataBinding, int localFieldId); 767 } 768 769 protected static class IncludedLayoutIndex { 770 public final String layout; 771 public final int index; 772 public final int layoutId; 773 774 public IncludedLayoutIndex(String layout, int index, int layoutId) { 775 this.layout = layout; 776 this.index = index; 777 this.layoutId = layoutId; 778 } 779 } 780} 781