RowPresenter.java revision b3b295890fd53727a7a40262f86dceedf68c7123
1/* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14package android.support.v17.leanback.widget; 15 16import android.support.v17.leanback.app.HeadersFragment; 17import android.support.v17.leanback.graphics.ColorOverlayDimmer; 18import android.view.View; 19import android.view.ViewGroup; 20 21/** 22 * An abstract {@link Presenter} that renders a {@link Row}. 23 * 24 * <h3>Customize UI widgets</h3> 25 * When a subclass of RowPresenter adds UI widgets, it should subclass 26 * {@link RowPresenter.ViewHolder} and override {@link #createRowViewHolder(ViewGroup)} 27 * and {@link #initializeRowViewHolder(ViewHolder)}. The subclass must use layout id 28 * "row_content" for the widget that will be aligned to the title of any {@link HeadersFragment} 29 * that may exist in the parent fragment. RowPresenter contains an optional and 30 * replaceable {@link RowHeaderPresenter} that renders the header. You can disable 31 * the default rendering or replace the Presenter with a new header presenter 32 * by calling {@link #setHeaderPresenter(RowHeaderPresenter)}. 33 * 34 * <h3>UI events from fragments</h3> 35 * RowPresenter receives calls from its parent (typically a Fragment) when: 36 * <ul> 37 * <li> 38 * A row is selected via {@link #setRowViewSelected(Presenter.ViewHolder, boolean)}. The event 39 * is triggered immediately when there is a row selection change before the selection 40 * animation is started. Selected status may control activated status of the row (see 41 * "Activated status" below). 42 * Subclasses of RowPresenter may override {@link #onRowViewSelected(ViewHolder, boolean)}. 43 * </li> 44 * <li> 45 * A row is expanded to full height via {@link #setRowViewExpanded(Presenter.ViewHolder, boolean)} 46 * when BrowseFragment hides fast lane on the left. 47 * The event is triggered immediately before the expand animation is started. 48 * Row title is shown when row is expanded. Expanded status may control activated status 49 * of the row (see "Activated status" below). 50 * Subclasses of RowPresenter may override {@link #onRowViewExpanded(ViewHolder, boolean)}. 51 * </li> 52 * </ul> 53 * 54 * <h3>Activated status</h3> 55 * The activated status of a row is applied to the row view and it's children via 56 * {@link View#setActivated(boolean)}. 57 * The activated status is typically used to control {@link BaseCardView} info region visibility. 58 * The row's activated status can be controlled by selected status and/or expanded status. 59 * Call {@link #setSyncActivatePolicy(int)} and choose one of the four policies: 60 * <ul> 61 * <li>{@link #SYNC_ACTIVATED_TO_EXPANDED} Activated status is synced with row expanded status</li> 62 * <li>{@link #SYNC_ACTIVATED_TO_SELECTED} Activated status is synced with row selected status</li> 63 * <li>{@link #SYNC_ACTIVATED_TO_EXPANDED_AND_SELECTED} Activated status is set to true 64 * when both expanded and selected status are true</li> 65 * <li>{@link #SYNC_ACTIVATED_CUSTOM} Activated status is not controlled by selected status 66 * or expanded status, application can control activated status by its own. 67 * Application should call {@link RowPresenter.ViewHolder#setActivated(boolean)} to change 68 * activated status of row view. 69 * </li> 70 * </ul> 71 * 72 * <h3>User events</h3> 73 * RowPresenter provides {@link OnItemSelectedListener} and {@link OnItemClickedListener}. 74 * If a subclass wants to add its own {@link View.OnFocusChangeListener} or 75 * {@link View.OnClickListener}, it must do that in {@link #createRowViewHolder(ViewGroup)} 76 * to be properly chained by the library. Adding View listeners after 77 * {@link #createRowViewHolder(ViewGroup)} is undefined and may result in 78 * incorrect behavior by the library's listeners. 79 * 80 * <h3>Selection animation</h3> 81 * <p> 82 * When a user scrolls through rows, a fragment will initiate animation and call 83 * {@link #setSelectLevel(Presenter.ViewHolder, float)} with float value between 84 * 0 and 1. By default, the RowPresenter draws a dim overlay on top of the row 85 * view for views that are not selected. Subclasses may override this default effect 86 * by having {@link #isUsingDefaultSelectEffect()} return false and overriding 87 * {@link #onSelectLevelChanged(ViewHolder)} to apply a different selection effect. 88 * </p> 89 * <p> 90 * Call {@link #setSelectEffectEnabled(boolean)} to enable/disable the select effect, 91 * This will not only enable/disable the default dim effect but also subclasses must 92 * respect this flag as well. 93 * </p> 94 */ 95public abstract class RowPresenter extends Presenter { 96 97 /** 98 * Don't synchronize row view activated status with selected status or expanded status, 99 * application will do its own through {@link RowPresenter.ViewHolder#setActivated(boolean)}. 100 */ 101 public static final int SYNC_ACTIVATED_CUSTOM = 0; 102 103 /** 104 * Synchronizes row view's activated status to expand status of the row view holder. 105 */ 106 public static final int SYNC_ACTIVATED_TO_EXPANDED = 1; 107 108 /** 109 * Synchronizes row view's activated status to selected status of the row view holder. 110 */ 111 public static final int SYNC_ACTIVATED_TO_SELECTED = 2; 112 113 /** 114 * Sets the row view's activated status to true when both expand and selected are true. 115 */ 116 public static final int SYNC_ACTIVATED_TO_EXPANDED_AND_SELECTED = 3; 117 118 static class ContainerViewHolder extends Presenter.ViewHolder { 119 /** 120 * wrapped row view holder 121 */ 122 final ViewHolder mRowViewHolder; 123 124 public ContainerViewHolder(RowContainerView containerView, ViewHolder rowViewHolder) { 125 super(containerView); 126 containerView.addRowView(rowViewHolder.view); 127 if (rowViewHolder.mHeaderViewHolder != null) { 128 containerView.addHeaderView(rowViewHolder.mHeaderViewHolder.view); 129 } 130 mRowViewHolder = rowViewHolder; 131 mRowViewHolder.mContainerViewHolder = this; 132 } 133 } 134 135 /** 136 * A view holder for a {@link Row}. 137 */ 138 public static class ViewHolder extends Presenter.ViewHolder { 139 private static final int ACTIVATED_NOT_ASSIGNED = 0; 140 private static final int ACTIVATED = 1; 141 private static final int NOT_ACTIVATED = 2; 142 143 ContainerViewHolder mContainerViewHolder; 144 RowHeaderPresenter.ViewHolder mHeaderViewHolder; 145 Row mRow; 146 int mActivated = ACTIVATED_NOT_ASSIGNED; 147 boolean mSelected; 148 boolean mExpanded; 149 boolean mInitialzed; 150 float mSelectLevel = 0f; // initially unselected 151 protected final ColorOverlayDimmer mColorDimmer; 152 153 /** 154 * Constructor for ViewHolder. 155 * 156 * @param view The View bound to the Row. 157 */ 158 public ViewHolder(View view) { 159 super(view); 160 mColorDimmer = ColorOverlayDimmer.createDefault(view.getContext()); 161 } 162 163 /** 164 * Returns the Row bound to the View in this ViewHolder. 165 */ 166 public final Row getRow() { 167 return mRow; 168 } 169 170 /** 171 * Returns whether the Row is in its expanded state. 172 * 173 * @return true if the Row is expanded, false otherwise. 174 */ 175 public final boolean isExpanded() { 176 return mExpanded; 177 } 178 179 /** 180 * Returns whether the Row is selected. 181 * 182 * @return true if the Row is selected, false otherwise. 183 */ 184 public final boolean isSelected() { 185 return mSelected; 186 } 187 188 /** 189 * Returns the current selection level of the Row. 190 */ 191 public final float getSelectLevel() { 192 return mSelectLevel; 193 } 194 195 /** 196 * Returns the view holder for the Row header for this Row. 197 */ 198 public final RowHeaderPresenter.ViewHolder getHeaderViewHolder() { 199 return mHeaderViewHolder; 200 } 201 202 /** 203 * Sets the row view's activated status. The status will be applied to children through 204 * {@link #syncActivatedStatus(View)}. Application should only call this function 205 * when {@link RowPresenter#getSyncActivatePolicy()} is 206 * {@link RowPresenter#SYNC_ACTIVATED_CUSTOM}; otherwise the value will 207 * be overwritten when expanded or selected status changes. 208 */ 209 public final void setActivated(boolean activated) { 210 mActivated = activated ? ACTIVATED : NOT_ACTIVATED; 211 } 212 213 /** 214 * Synchronizes the activated status of view to the last value passed through 215 * {@link RowPresenter.ViewHolder#setActivated(boolean)}. No operation if 216 * {@link RowPresenter.ViewHolder#setActivated(boolean)} is never called. Normally 217 * application does not need to call this method, {@link ListRowPresenter} automatically 218 * calls this method when a child is attached to list row. However if 219 * application writes its own custom RowPresenter, it should call this method 220 * when attaches a child to the row view. 221 */ 222 public final void syncActivatedStatus(View view) { 223 if (mActivated == ACTIVATED) { 224 view.setActivated(true); 225 } else if (mActivated == NOT_ACTIVATED) { 226 view.setActivated(false); 227 } 228 } 229 } 230 231 private RowHeaderPresenter mHeaderPresenter = new RowHeaderPresenter(); 232 private OnItemSelectedListener mOnItemSelectedListener; 233 private OnItemClickedListener mOnItemClickedListener; 234 private OnItemViewSelectedListener mOnItemViewSelectedListener; 235 private OnItemViewClickedListener mOnItemViewClickedListener; 236 237 boolean mSelectEffectEnabled = true; 238 int mSyncActivatePolicy = SYNC_ACTIVATED_TO_EXPANDED; 239 240 @Override 241 public final Presenter.ViewHolder onCreateViewHolder(ViewGroup parent) { 242 ViewHolder vh = createRowViewHolder(parent); 243 vh.mInitialzed = false; 244 Presenter.ViewHolder result; 245 if (needsRowContainerView()) { 246 RowContainerView containerView = new RowContainerView(parent.getContext()); 247 if (mHeaderPresenter != null) { 248 vh.mHeaderViewHolder = (RowHeaderPresenter.ViewHolder) 249 mHeaderPresenter.onCreateViewHolder((ViewGroup) vh.view); 250 } 251 result = new ContainerViewHolder(containerView, vh); 252 } else { 253 result = vh; 254 } 255 initializeRowViewHolder(vh); 256 if (!vh.mInitialzed) { 257 throw new RuntimeException("super.initializeRowViewHolder() must be called"); 258 } 259 return result; 260 } 261 262 /** 263 * Called to create a ViewHolder object for a Row. Subclasses will override 264 * this method to return a different concrete ViewHolder object. 265 * 266 * @param parent The parent View for the Row's view holder. 267 * @return A ViewHolder for the Row's View. 268 */ 269 protected abstract ViewHolder createRowViewHolder(ViewGroup parent); 270 271 /** 272 * Called after a {@link RowPresenter.ViewHolder} is created for a Row. 273 * Subclasses may override this method and start by calling 274 * super.initializeRowViewHolder(ViewHolder). 275 * 276 * @param vh The ViewHolder to initialize for the Row. 277 */ 278 protected void initializeRowViewHolder(ViewHolder vh) { 279 vh.mInitialzed = true; 280 // set clip children to false for slide transition 281 ((ViewGroup) vh.view).setClipChildren(false); 282 if (vh.mContainerViewHolder != null) { 283 ((ViewGroup) vh.mContainerViewHolder.view).setClipChildren(false); 284 } 285 } 286 287 /** 288 * Set the Presenter used for rendering the header. Can be null to disable 289 * header rendering. The method must be called before creating any Row Views. 290 */ 291 public final void setHeaderPresenter(RowHeaderPresenter headerPresenter) { 292 mHeaderPresenter = headerPresenter; 293 } 294 295 /** 296 * Get the Presenter used for rendering the header, or null if none has been 297 * set. 298 */ 299 public final RowHeaderPresenter getHeaderPresenter() { 300 return mHeaderPresenter; 301 } 302 303 /** 304 * Get the {@link RowPresenter.ViewHolder} from the given Presenter 305 * ViewHolder. 306 */ 307 public final ViewHolder getRowViewHolder(Presenter.ViewHolder holder) { 308 if (holder instanceof ContainerViewHolder) { 309 return ((ContainerViewHolder) holder).mRowViewHolder; 310 } else { 311 return (ViewHolder) holder; 312 } 313 } 314 315 /** 316 * Set the expanded state of a Row view. 317 * 318 * @param holder The Row ViewHolder to set expanded state on. 319 * @param expanded True if the Row is expanded, false otherwise. 320 */ 321 public final void setRowViewExpanded(Presenter.ViewHolder holder, boolean expanded) { 322 ViewHolder rowViewHolder = getRowViewHolder(holder); 323 rowViewHolder.mExpanded = expanded; 324 onRowViewExpanded(rowViewHolder, expanded); 325 } 326 327 /** 328 * Set the selected state of a Row view. 329 * 330 * @param holder The Row ViewHolder to set expanded state on. 331 * @param selected True if the Row is expanded, false otherwise. 332 */ 333 public final void setRowViewSelected(Presenter.ViewHolder holder, boolean selected) { 334 ViewHolder rowViewHolder = getRowViewHolder(holder); 335 rowViewHolder.mSelected = selected; 336 onRowViewSelected(rowViewHolder, selected); 337 } 338 339 /** 340 * Subclass may override this to respond to expanded state changes of a Row. 341 * The default implementation will hide/show the header view. Subclasses may 342 * make visual changes to the Row View but must not create animation on the 343 * Row view. 344 */ 345 protected void onRowViewExpanded(ViewHolder vh, boolean expanded) { 346 updateHeaderViewVisibility(vh); 347 updateActivateStatus(vh, vh.view); 348 } 349 350 /** 351 * Update view's activate status according to {@link #getSyncActivatePolicy()} and the 352 * selected status and expanded status of the RowPresenter ViewHolder. 353 */ 354 private void updateActivateStatus(ViewHolder vh, View view) { 355 switch (mSyncActivatePolicy) { 356 case SYNC_ACTIVATED_TO_EXPANDED: 357 vh.setActivated(vh.isExpanded()); 358 break; 359 case SYNC_ACTIVATED_TO_SELECTED: 360 vh.setActivated(vh.isSelected()); 361 break; 362 case SYNC_ACTIVATED_TO_EXPANDED_AND_SELECTED: 363 vh.setActivated(vh.isExpanded() && vh.isSelected()); 364 break; 365 } 366 vh.syncActivatedStatus(view); 367 } 368 369 /** 370 * Sets policy of updating row view activated status. Can be one of: 371 * <li> Default value {@link #SYNC_ACTIVATED_TO_EXPANDED} 372 * <li> {@link #SYNC_ACTIVATED_TO_SELECTED} 373 * <li> {@link #SYNC_ACTIVATED_TO_EXPANDED_AND_SELECTED} 374 * <li> {@link #SYNC_ACTIVATED_CUSTOM} 375 */ 376 public final void setSyncActivatePolicy(int syncActivatePolicy) { 377 mSyncActivatePolicy = syncActivatePolicy; 378 } 379 380 /** 381 * Returns policy of updating row view activated status. Can be one of: 382 * <li> Default value {@link #SYNC_ACTIVATED_TO_EXPANDED} 383 * <li> {@link #SYNC_ACTIVATED_TO_SELECTED} 384 * <li> {@link #SYNC_ACTIVATED_TO_EXPANDED_AND_SELECTED} 385 * <li> {@link #SYNC_ACTIVATED_CUSTOM} 386 */ 387 public final int getSyncActivatePolicy() { 388 return mSyncActivatePolicy; 389 } 390 391 /** 392 * Subclass may override this to respond to selected state changes of a Row. 393 * Subclass may make visual changes to Row view but must not create 394 * animation on the Row view. 395 */ 396 protected void onRowViewSelected(ViewHolder vh, boolean selected) { 397 if (selected) { 398 if (mOnItemViewSelectedListener != null) { 399 mOnItemViewSelectedListener.onItemSelected(null, null, vh, vh.getRow()); 400 } 401 if (mOnItemSelectedListener != null) { 402 mOnItemSelectedListener.onItemSelected(null, vh.getRow()); 403 } 404 } 405 updateHeaderViewVisibility(vh); 406 updateActivateStatus(vh, vh.view); 407 } 408 409 private void updateHeaderViewVisibility(ViewHolder vh) { 410 if (mHeaderPresenter != null && vh.mHeaderViewHolder != null) { 411 RowContainerView containerView = ((RowContainerView) vh.mContainerViewHolder.view); 412 containerView.showHeader(vh.isExpanded()); 413 } 414 } 415 416 /** 417 * Set the current select level to a value between 0 (unselected) and 1 (selected). 418 * Subclasses may override {@link #onSelectLevelChanged(ViewHolder)} to 419 * respond to changes in the selected level. 420 */ 421 public final void setSelectLevel(Presenter.ViewHolder vh, float level) { 422 ViewHolder rowViewHolder = getRowViewHolder(vh); 423 rowViewHolder.mSelectLevel = level; 424 onSelectLevelChanged(rowViewHolder); 425 } 426 427 /** 428 * Get the current select level. The value will be between 0 (unselected) 429 * and 1 (selected). 430 */ 431 public final float getSelectLevel(Presenter.ViewHolder vh) { 432 return getRowViewHolder(vh).mSelectLevel; 433 } 434 435 /** 436 * Callback when select level is changed. The default implementation applies 437 * the select level to {@link RowHeaderPresenter#setSelectLevel(RowHeaderPresenter.ViewHolder, float)} 438 * when {@link #getSelectEffectEnabled()} is true. Subclasses may override 439 * this function and implement a different select effect. In this case, you 440 * should also override {@link #isUsingDefaultSelectEffect()} to disable 441 * the default dimming effect applied by the library. 442 */ 443 protected void onSelectLevelChanged(ViewHolder vh) { 444 if (getSelectEffectEnabled()) { 445 vh.mColorDimmer.setActiveLevel(vh.mSelectLevel); 446 if (vh.mHeaderViewHolder != null) { 447 mHeaderPresenter.setSelectLevel(vh.mHeaderViewHolder, vh.mSelectLevel); 448 } 449 if (isUsingDefaultSelectEffect()) { 450 ((RowContainerView) vh.mContainerViewHolder.view).setForegroundColor( 451 vh.mColorDimmer.getPaint().getColor()); 452 } 453 } 454 } 455 456 /** 457 * Enables or disables the row selection effect. 458 * This will not only affect the default dim effect, but subclasses must 459 * respect this flag as well. 460 */ 461 public final void setSelectEffectEnabled(boolean applyDimOnSelect) { 462 mSelectEffectEnabled = applyDimOnSelect; 463 } 464 465 /** 466 * Returns true if the row selection effect is enabled. 467 * This value not only determines whether the default dim implementation is 468 * used, but subclasses must also respect this flag. 469 */ 470 public final boolean getSelectEffectEnabled() { 471 return mSelectEffectEnabled; 472 } 473 474 /** 475 * Return whether this RowPresenter is using the default dimming effect 476 * provided by the library. Subclasses may(most likely) return false and 477 * override {@link #onSelectLevelChanged(ViewHolder)}. 478 */ 479 public boolean isUsingDefaultSelectEffect() { 480 return true; 481 } 482 483 final boolean needsDefaultSelectEffect() { 484 return isUsingDefaultSelectEffect() && getSelectEffectEnabled(); 485 } 486 487 final boolean needsRowContainerView() { 488 return mHeaderPresenter != null || needsDefaultSelectEffect(); 489 } 490 491 /** 492 * Return true if the Row view can draw outside its bounds. 493 */ 494 public boolean canDrawOutOfBounds() { 495 return false; 496 } 497 498 @Override 499 public final void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) { 500 onBindRowViewHolder(getRowViewHolder(viewHolder), item); 501 } 502 503 protected void onBindRowViewHolder(ViewHolder vh, Object item) { 504 vh.mRow = (Row) item; 505 if (vh.mHeaderViewHolder != null) { 506 mHeaderPresenter.onBindViewHolder(vh.mHeaderViewHolder, item); 507 } 508 } 509 510 @Override 511 public final void onUnbindViewHolder(Presenter.ViewHolder viewHolder) { 512 onUnbindRowViewHolder(getRowViewHolder(viewHolder)); 513 } 514 515 protected void onUnbindRowViewHolder(ViewHolder vh) { 516 if (vh.mHeaderViewHolder != null) { 517 mHeaderPresenter.onUnbindViewHolder(vh.mHeaderViewHolder); 518 } 519 vh.mRow = null; 520 } 521 522 @Override 523 public final void onViewAttachedToWindow(Presenter.ViewHolder holder) { 524 onRowViewAttachedToWindow(getRowViewHolder(holder)); 525 } 526 527 protected void onRowViewAttachedToWindow(ViewHolder vh) { 528 if (vh.mHeaderViewHolder != null) { 529 mHeaderPresenter.onViewAttachedToWindow(vh.mHeaderViewHolder); 530 } 531 } 532 533 @Override 534 public final void onViewDetachedFromWindow(Presenter.ViewHolder holder) { 535 onRowViewDetachedFromWindow(getRowViewHolder(holder)); 536 } 537 538 protected void onRowViewDetachedFromWindow(ViewHolder vh) { 539 if (vh.mHeaderViewHolder != null) { 540 mHeaderPresenter.onViewDetachedFromWindow(vh.mHeaderViewHolder); 541 } 542 cancelAnimationsRecursive(vh.view); 543 } 544 545 /** 546 * Set the listener for item or row selection. A RowPresenter fires a row 547 * selection event with a null item. Subclasses (e.g. {@link ListRowPresenter}) 548 * can fire a selection event with the selected item. 549 */ 550 public final void setOnItemSelectedListener(OnItemSelectedListener listener) { 551 mOnItemSelectedListener = listener; 552 } 553 554 /** 555 * Get the listener for item or row selection. 556 */ 557 public final OnItemSelectedListener getOnItemSelectedListener() { 558 return mOnItemSelectedListener; 559 } 560 561 /** 562 * Set the listener for item click events. A RowPresenter does not use this 563 * listener, but a subclass may fire an item click event if it has the concept 564 * of an item. The {@link OnItemClickedListener} will override any 565 * {@link View.OnClickListener} that an item's Presenter sets during 566 * {@link Presenter#onCreateViewHolder(ViewGroup)}. So in general, you 567 * should choose to use an OnItemClickedListener or a {@link 568 * View.OnClickListener}, but not both. 569 */ 570 public final void setOnItemClickedListener(OnItemClickedListener listener) { 571 mOnItemClickedListener = listener; 572 } 573 574 /** 575 * Get the listener for item click events. 576 */ 577 public final OnItemClickedListener getOnItemClickedListener() { 578 return mOnItemClickedListener; 579 } 580 581 /** 582 * Set listener for item or row selection. RowPresenter fires row selection 583 * event with null item, subclass of RowPresenter e.g. {@link ListRowPresenter} can 584 * fire a selection event with selected item. 585 */ 586 public final void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) { 587 mOnItemViewSelectedListener = listener; 588 } 589 590 /** 591 * Get listener for item or row selection. 592 */ 593 public final OnItemViewSelectedListener getOnItemViewSelectedListener() { 594 return mOnItemViewSelectedListener; 595 } 596 597 /** 598 * Set listener for item click event. RowPresenter does nothing but subclass of 599 * RowPresenter may fire item click event if it does have a concept of item. 600 * OnItemViewClickedListener will override {@link View.OnClickListener} that 601 * item presenter sets during {@link Presenter#onCreateViewHolder(ViewGroup)}. 602 * So in general, developer should choose one of the listeners but not both. 603 */ 604 public final void setOnItemViewClickedListener(OnItemViewClickedListener listener) { 605 mOnItemViewClickedListener = listener; 606 } 607 608 /** 609 * Set listener for item click event. 610 */ 611 public final OnItemViewClickedListener getOnItemViewClickedListener() { 612 return mOnItemViewClickedListener; 613 } 614 615 /** 616 * Freeze/Unfreeze the row, typically used when transition starts/ends. 617 * This method is called by fragment, app should not call it directly. 618 */ 619 public void freeze(ViewHolder holder, boolean freeze) { 620 } 621 622 /** 623 * Change visibility of views, entrance transition will be run against the views that 624 * change visibilities. Subclass may override and begin with calling 625 * super.setEntranceTransitionState(). This method is called by fragment, 626 * app should not call it directly. 627 */ 628 public void setEntranceTransitionState(ViewHolder holder, boolean afterTransition) { 629 if (holder.mHeaderViewHolder != null) { 630 holder.mHeaderViewHolder.view.setVisibility(afterTransition ? 631 View.VISIBLE : View.INVISIBLE); 632 } 633 } 634} 635