BrowseFragment.java revision bb0a680c10b84b83833a59634373140f8bd0750c
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.app; 15 16import static android.support.v7.widget.RecyclerView.NO_POSITION; 17 18import android.app.Fragment; 19import android.app.FragmentManager; 20import android.app.FragmentManager.BackStackEntry; 21import android.app.FragmentTransaction; 22import android.content.res.TypedArray; 23import android.graphics.Color; 24import android.graphics.Rect; 25import android.os.Bundle; 26import android.support.annotation.ColorInt; 27import android.support.v17.leanback.R; 28import android.support.v17.leanback.transition.TransitionHelper; 29import android.support.v17.leanback.transition.TransitionListener; 30import android.support.v17.leanback.widget.BrowseFrameLayout; 31import android.support.v17.leanback.widget.ListRow; 32import android.support.v17.leanback.widget.ObjectAdapter; 33import android.support.v17.leanback.widget.OnItemViewClickedListener; 34import android.support.v17.leanback.widget.OnItemViewSelectedListener; 35import android.support.v17.leanback.widget.PageRow; 36import android.support.v17.leanback.widget.Presenter; 37import android.support.v17.leanback.widget.PresenterSelector; 38import android.support.v17.leanback.widget.Row; 39import android.support.v17.leanback.widget.RowHeaderPresenter; 40import android.support.v17.leanback.widget.RowPresenter; 41import android.support.v17.leanback.widget.ScaleFrameLayout; 42import android.support.v17.leanback.widget.TitleView; 43import android.support.v17.leanback.widget.VerticalGridView; 44import android.support.v4.view.ViewCompat; 45import android.util.Log; 46import android.view.LayoutInflater; 47import android.view.View; 48import android.view.ViewGroup; 49import android.view.ViewGroup.MarginLayoutParams; 50import android.view.ViewTreeObserver; 51 52import java.util.HashMap; 53import java.util.Map; 54 55/** 56 * A fragment for creating Leanback browse screens. It is composed of a 57 * RowsFragment and a HeadersFragment. 58 * <p> 59 * A BrowseFragment renders the elements of its {@link ObjectAdapter} as a set 60 * of rows in a vertical list. The elements in this adapter must be subclasses 61 * of {@link Row}. 62 * <p> 63 * The HeadersFragment can be set to be either shown or hidden by default, or 64 * may be disabled entirely. See {@link #setHeadersState} for details. 65 * <p> 66 * By default the BrowseFragment includes support for returning to the headers 67 * when the user presses Back. For Activities that customize {@link 68 * android.app.Activity#onBackPressed()}, you must disable this default Back key support by 69 * calling {@link #setHeadersTransitionOnBackEnabled(boolean)} with false and 70 * use {@link BrowseFragment.BrowseTransitionListener} and 71 * {@link #startHeadersTransition(boolean)}. 72 * <p> 73 * The recommended theme to use with a BrowseFragment is 74 * {@link android.support.v17.leanback.R.style#Theme_Leanback_Browse}. 75 * </p> 76 */ 77public class BrowseFragment extends BaseFragment { 78 79 // BUNDLE attribute for saving header show/hide status when backstack is used: 80 static final String HEADER_STACK_INDEX = "headerStackIndex"; 81 // BUNDLE attribute for saving header show/hide status when backstack is not used: 82 static final String HEADER_SHOW = "headerShow"; 83 private static final String IS_PAGE_ROW = "isPageRow"; 84 private static final String CURRENT_SELECTED_POSITION = "currentSelectedPosition"; 85 86 final class BackStackListener implements FragmentManager.OnBackStackChangedListener { 87 int mLastEntryCount; 88 int mIndexOfHeadersBackStack; 89 90 BackStackListener() { 91 mLastEntryCount = getFragmentManager().getBackStackEntryCount(); 92 mIndexOfHeadersBackStack = -1; 93 } 94 95 void load(Bundle savedInstanceState) { 96 if (savedInstanceState != null) { 97 mIndexOfHeadersBackStack = savedInstanceState.getInt(HEADER_STACK_INDEX, -1); 98 mShowingHeaders = mIndexOfHeadersBackStack == -1; 99 } else { 100 if (!mShowingHeaders) { 101 getFragmentManager().beginTransaction() 102 .addToBackStack(mWithHeadersBackStackName).commit(); 103 } 104 } 105 } 106 107 void save(Bundle outState) { 108 outState.putInt(HEADER_STACK_INDEX, mIndexOfHeadersBackStack); 109 } 110 111 112 @Override 113 public void onBackStackChanged() { 114 if (getFragmentManager() == null) { 115 Log.w(TAG, "getFragmentManager() is null, stack:", new Exception()); 116 return; 117 } 118 int count = getFragmentManager().getBackStackEntryCount(); 119 // if backstack is growing and last pushed entry is "headers" backstack, 120 // remember the index of the entry. 121 if (count > mLastEntryCount) { 122 BackStackEntry entry = getFragmentManager().getBackStackEntryAt(count - 1); 123 if (mWithHeadersBackStackName.equals(entry.getName())) { 124 mIndexOfHeadersBackStack = count - 1; 125 } 126 } else if (count < mLastEntryCount) { 127 // if popped "headers" backstack, initiate the show header transition if needed 128 if (mIndexOfHeadersBackStack >= count) { 129 mIndexOfHeadersBackStack = -1; 130 if (!mShowingHeaders) { 131 startHeadersTransitionInternal(true); 132 } 133 } 134 } 135 mLastEntryCount = count; 136 } 137 } 138 139 /** 140 * Listener for transitions between browse headers and rows. 141 */ 142 public static class BrowseTransitionListener { 143 /** 144 * Callback when headers transition starts. 145 * 146 * @param withHeaders True if the transition will result in headers 147 * being shown, false otherwise. 148 */ 149 public void onHeadersTransitionStart(boolean withHeaders) { 150 } 151 /** 152 * Callback when headers transition stops. 153 * 154 * @param withHeaders True if the transition will result in headers 155 * being shown, false otherwise. 156 */ 157 public void onHeadersTransitionStop(boolean withHeaders) { 158 } 159 } 160 161 private class SetSelectionRunnable implements Runnable { 162 static final int TYPE_INVALID = -1; 163 static final int TYPE_INTERNAL_SYNC = 0; 164 static final int TYPE_USER_REQUEST = 1; 165 166 private int mPosition; 167 private int mType; 168 private boolean mSmooth; 169 170 SetSelectionRunnable() { 171 reset(); 172 } 173 174 void post(int position, int type, boolean smooth) { 175 // Posting the set selection, rather than calling it immediately, prevents an issue 176 // with adapter changes. Example: a row is added before the current selected row; 177 // first the fast lane view updates its selection, then the rows fragment has that 178 // new selection propagated immediately; THEN the rows view processes the same adapter 179 // change and moves the selection again. 180 if (type >= mType) { 181 mPosition = position; 182 mType = type; 183 mSmooth = smooth; 184 mBrowseFrame.removeCallbacks(this); 185 mBrowseFrame.post(this); 186 } 187 } 188 189 @Override 190 public void run() { 191 setSelection(mPosition, mSmooth); 192 reset(); 193 } 194 195 private void reset() { 196 mPosition = -1; 197 mType = TYPE_INVALID; 198 mSmooth = false; 199 } 200 } 201 202 /** 203 * Interface that defines the interaction between {@link BrowseFragment} and it's main 204 * content fragment. The key method is {@link MainFragmentAdapter#getFragment()}, 205 * it will be used to get the fragment to be shown in the content section. Clients can 206 * provide any implementation of fragment and customize it's interaction with 207 * {@link BrowseFragment} by overriding the necessary methods. 208 * 209 * <p> 210 * Clients are expected to provide 211 * an instance of {@link MainFragmentAdapterRegistry} which will be responsible for providing 212 * implementations of {@link MainFragmentAdapter} for given content types. Currently 213 * we support different types of content - {@link ListRow}, {@link PageRow} or any subtype 214 * of {@link Row}. We provide an out of the box adapter implementation for any rows other than 215 * {@link PageRow} - {@link android.support.v17.leanback.app.RowsFragment.MainFragmentAdapter}. 216 * 217 * <p> 218 * {@link PageRow} is intended to give full flexibility to developers in terms of Fragment 219 * design. Users will have to provide an implementation of {@link MainFragmentAdapter} 220 * and provide that through {@link MainFragmentAdapterRegistry}. 221 * {@link MainFragmentAdapter} implementation can supply any fragment and override 222 * just those interactions that makes sense. 223 */ 224 public static class MainFragmentAdapter<T extends Fragment> { 225 private boolean mScalingEnabled; 226 private final T mFragment; 227 228 public MainFragmentAdapter(T fragment) { 229 this.mFragment = fragment; 230 } 231 232 public final T getFragment() { 233 return mFragment; 234 } 235 236 /** 237 * Returns whether its scrolling. 238 */ 239 public boolean isScrolling() { 240 return false; 241 } 242 243 /** 244 * Set the visibility of titles/hovercard of browse rows. 245 */ 246 public void setExpand(boolean expand) { 247 } 248 249 /** 250 * For rows that willing to participate entrance transition, this function 251 * hide views if afterTransition is true, show views if afterTransition is false. 252 */ 253 public void setEntranceTransitionState(boolean state) { 254 } 255 256 /** 257 * Sets the window alignment and also the pivots for scale operation. 258 */ 259 public void setAlignment(int windowAlignOffsetFromTop) { 260 } 261 262 /** 263 * Callback indicating transition prepare start. 264 */ 265 public boolean onTransitionPrepare() { 266 return false; 267 } 268 269 /** 270 * Callback indicating transition start. 271 */ 272 public void onTransitionStart() { 273 } 274 275 /** 276 * Callback indicating transition end. 277 */ 278 public void onTransitionEnd() { 279 } 280 281 /** 282 * Returns whether row scaling is enabled. 283 */ 284 public boolean isScalingEnabled() { 285 return mScalingEnabled; 286 } 287 288 /** 289 * Sets the row scaling property. 290 */ 291 public void setScalingEnabled(boolean scalingEnabled) { 292 this.mScalingEnabled = scalingEnabled; 293 } 294 } 295 296 /** 297 * This is used to pass information to {@link RowsFragment}. 298 * {@link android.support.v17.leanback.app.RowsFragment.MainFragmentAdapter} 299 * would return an instance to connect the callbacks from {@link BrowseFragment} to 300 * {@link RowsFragment}. 301 */ 302 public static class MainFragmentRowsAdapter<T extends Fragment> { 303 private final T mFragment; 304 305 public MainFragmentRowsAdapter(T fragment) { 306 if (fragment == null) { 307 throw new IllegalArgumentException("Fragment can't be null"); 308 } 309 this.mFragment = fragment; 310 } 311 312 public final T getFragment() { 313 return mFragment; 314 } 315 /** 316 * Set the visibility titles/hover of browse rows. 317 */ 318 public void setAdapter(ObjectAdapter adapter) { 319 } 320 321 /** 322 * Sets an item clicked listener on the fragment. 323 */ 324 public void setOnItemViewClickedListener(OnItemViewClickedListener listener) { 325 } 326 327 /** 328 * Sets an item selection listener. 329 */ 330 public void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) { 331 } 332 333 /** 334 * Selects a Row and perform an optional task on the Row. 335 */ 336 public void setSelectedPosition(int rowPosition, 337 boolean smooth, 338 final Presenter.ViewHolderTask rowHolderTask) { 339 } 340 341 /** 342 * Selects a Row. 343 */ 344 public void setSelectedPosition(int rowPosition, boolean smooth) { 345 } 346 347 /** 348 * Returns the selected position. 349 */ 350 public int getSelectedPosition() { 351 return 0; 352 } 353 } 354 355 private boolean createMainFragment(ObjectAdapter adapter, int position) { 356 Object item = null; 357 if (adapter == null || adapter.size() == 0) { 358 return false; 359 } else { 360 if (position < 0) { 361 position = 0; 362 } else if (position >= adapter.size()) { 363 throw new IllegalArgumentException( 364 String.format("Invalid position %d requested", position)); 365 } 366 item = adapter.get(position); 367 } 368 369 boolean oldIsPageRow = mIsPageRow; 370 mIsPageRow = item instanceof PageRow; 371 boolean swap; 372 373 if (mMainFragment == null) { 374 swap = true; 375 } else { 376 if (oldIsPageRow) { 377 swap = true; 378 } else { 379 swap = mIsPageRow; 380 } 381 } 382 383 if (swap) { 384 mMainFragment = mMainFragmentAdapterRegistry.createFragment(item); 385 mMainFragmentAdapter = (MainFragmentAdapter) ((Adaptable)mMainFragment) 386 .getAdapter(MainFragmentAdapter.class); 387 if (!mIsPageRow) { 388 mMainFragmentRowsAdapter = (MainFragmentRowsAdapter) ((Adaptable)mMainFragment) 389 .getAdapter(MainFragmentRowsAdapter.class); 390 mIsPageRow = mMainFragmentRowsAdapter == null; 391 } else { 392 mMainFragmentRowsAdapter = null; 393 } 394 } 395 return swap; 396 } 397 398 /** 399 * Factory class responsible for creating fragment given the current item. {@link ListRow} 400 * should returns {@link RowsFragment} or it's subclass whereas {@link PageRow} 401 * can return any fragment class. 402 */ 403 public abstract static class FragmentFactory<T extends Fragment> { 404 public abstract T createFragment(Object row); 405 } 406 407 /** 408 * FragmentFactory implementation for {@link ListRow}. 409 */ 410 public static class ListRowFragmentFactory extends FragmentFactory<RowsFragment> { 411 @Override 412 public RowsFragment createFragment(Object row) { 413 return new RowsFragment(); 414 } 415 } 416 417 /** 418 * Registry class maintaining the mapping of {@link Row} subclasses to {@link FragmentFactory}. 419 * BrowseRowFragment automatically registers {@link ListRowFragmentFactory} for 420 * handling {@link ListRow}. Developers can override that and also if they want to 421 * use custom fragment, they can register a custom {@link FragmentFactory} 422 * against {@link PageRow}. 423 */ 424 public final static class MainFragmentAdapterRegistry { 425 private Map<Class, FragmentFactory> itemToFragmentFactoryMapping = new HashMap(); 426 427 public void registerFragment(Class rowClass, FragmentFactory factory) { 428 itemToFragmentFactoryMapping.put(rowClass, factory); 429 } 430 431 public Fragment createFragment(Object item) { 432 if (item == null) { 433 throw new IllegalArgumentException("Item can't be null"); 434 } 435 436 return itemToFragmentFactoryMapping.get(item.getClass()).createFragment(item); 437 } 438 } 439 440 private static final String TAG = "BrowseFragment"; 441 442 private static final String LB_HEADERS_BACKSTACK = "lbHeadersBackStack_"; 443 444 private static boolean DEBUG = false; 445 446 /** The headers fragment is enabled and shown by default. */ 447 public static final int HEADERS_ENABLED = 1; 448 449 /** The headers fragment is enabled and hidden by default. */ 450 public static final int HEADERS_HIDDEN = 2; 451 452 /** The headers fragment is disabled and will never be shown. */ 453 public static final int HEADERS_DISABLED = 3; 454 455 private MainFragmentAdapterRegistry mMainFragmentAdapterRegistry 456 = new MainFragmentAdapterRegistry(); 457 private MainFragmentAdapter mMainFragmentAdapter; 458 private Fragment mMainFragment; 459 private HeadersFragment mHeadersFragment; 460 private MainFragmentRowsAdapter mMainFragmentRowsAdapter; 461 462 private ObjectAdapter mAdapter; 463 464 private int mHeadersState = HEADERS_ENABLED; 465 private int mBrandColor = Color.TRANSPARENT; 466 private boolean mBrandColorSet; 467 468 private BrowseFrameLayout mBrowseFrame; 469 private ScaleFrameLayout mScaleFrameLayout; 470 private boolean mHeadersBackStackEnabled = true; 471 private String mWithHeadersBackStackName; 472 private boolean mShowingHeaders = true; 473 private boolean mCanShowHeaders = true; 474 private int mContainerListMarginStart; 475 private int mContainerListAlignTop; 476 private boolean mMainFragmentScaleEnabled = true; 477 private OnItemViewSelectedListener mExternalOnItemViewSelectedListener; 478 private OnItemViewClickedListener mOnItemViewClickedListener; 479 private int mSelectedPosition = -1; 480 private float mScaleFactor; 481 private boolean mIsPageRow; 482 483 private PresenterSelector mHeaderPresenterSelector; 484 private final SetSelectionRunnable mSetSelectionRunnable = new SetSelectionRunnable(); 485 486 // transition related: 487 private Object mSceneWithHeaders; 488 private Object mSceneWithoutHeaders; 489 private Object mSceneAfterEntranceTransition; 490 private Object mHeadersTransition; 491 private BackStackListener mBackStackChangedListener; 492 private BrowseTransitionListener mBrowseTransitionListener; 493 494 private static final String ARG_TITLE = BrowseFragment.class.getCanonicalName() + ".title"; 495 private static final String ARG_BADGE_URI = BrowseFragment.class.getCanonicalName() + ".badge"; 496 private static final String ARG_HEADERS_STATE = 497 BrowseFragment.class.getCanonicalName() + ".headersState"; 498 499 /** 500 * Creates arguments for a browse fragment. 501 * 502 * @param args The Bundle to place arguments into, or null if the method 503 * should return a new Bundle. 504 * @param title The title of the BrowseFragment. 505 * @param headersState The initial state of the headers of the 506 * BrowseFragment. Must be one of {@link #HEADERS_ENABLED}, {@link 507 * #HEADERS_HIDDEN}, or {@link #HEADERS_DISABLED}. 508 * @return A Bundle with the given arguments for creating a BrowseFragment. 509 */ 510 public static Bundle createArgs(Bundle args, String title, int headersState) { 511 if (args == null) { 512 args = new Bundle(); 513 } 514 args.putString(ARG_TITLE, title); 515 args.putInt(ARG_HEADERS_STATE, headersState); 516 return args; 517 } 518 519 /** 520 * Sets the brand color for the browse fragment. The brand color is used as 521 * the primary color for UI elements in the browse fragment. For example, 522 * the background color of the headers fragment uses the brand color. 523 * 524 * @param color The color to use as the brand color of the fragment. 525 */ 526 public void setBrandColor(@ColorInt int color) { 527 mBrandColor = color; 528 mBrandColorSet = true; 529 530 if (mHeadersFragment != null) { 531 mHeadersFragment.setBackgroundColor(mBrandColor); 532 } 533 } 534 535 /** 536 * Returns the brand color for the browse fragment. 537 * The default is transparent. 538 */ 539 @ColorInt 540 public int getBrandColor() { 541 return mBrandColor; 542 } 543 544 /** 545 * Sets the adapter containing the rows for the fragment. 546 * 547 * <p>The items referenced by the adapter must be be derived from 548 * {@link Row}. These rows will be used by the rows fragment and the headers 549 * fragment (if not disabled) to render the browse rows. 550 * 551 * @param adapter An ObjectAdapter for the browse rows. All items must 552 * derive from {@link Row}. 553 */ 554 public void setAdapter(ObjectAdapter adapter) { 555 mAdapter = adapter; 556 replaceMainFragment(mSelectedPosition); 557 558 if (adapter != null) { 559 if (mMainFragmentRowsAdapter != null) { 560 mMainFragmentRowsAdapter.setAdapter(adapter); 561 } 562 mHeadersFragment.setAdapter(adapter); 563 } 564 } 565 566 public final MainFragmentAdapterRegistry getMainFragmentRegistry() { 567 return mMainFragmentAdapterRegistry; 568 } 569 570 /** 571 * Returns the adapter containing the rows for the fragment. 572 */ 573 public ObjectAdapter getAdapter() { 574 return mAdapter; 575 } 576 577 /** 578 * Sets an item selection listener. 579 */ 580 public void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) { 581 mExternalOnItemViewSelectedListener = listener; 582 } 583 584 /** 585 * Returns an item selection listener. 586 */ 587 public OnItemViewSelectedListener getOnItemViewSelectedListener() { 588 return mExternalOnItemViewSelectedListener; 589 } 590 591 /** 592 * Get RowsFragment if it's bound to BrowseFragment or null if either BrowseFragment has 593 * not been created yet or a different fragment is bound to it. 594 * 595 * @return RowsFragment if it's bound to BrowseFragment or null otherwise. 596 */ 597 public RowsFragment getRowsFragment() { 598 if (mMainFragment instanceof RowsFragment) { 599 return (RowsFragment) mMainFragment; 600 } 601 602 return null; 603 } 604 605 /** 606 * Get currently bound HeadersFragment or null if HeadersFragment has not been created yet. 607 * @return Currently bound HeadersFragment or null if HeadersFragment has not been created yet. 608 */ 609 public HeadersFragment getHeadersFragment() { 610 return mHeadersFragment; 611 } 612 613 /** 614 * Sets an item clicked listener on the fragment. 615 * OnItemViewClickedListener will override {@link View.OnClickListener} that 616 * item presenter sets during {@link Presenter#onCreateViewHolder(ViewGroup)}. 617 * So in general, developer should choose one of the listeners but not both. 618 */ 619 public void setOnItemViewClickedListener(OnItemViewClickedListener listener) { 620 mOnItemViewClickedListener = listener; 621 if (mMainFragmentAdapter != null) { 622 mMainFragmentRowsAdapter.setOnItemViewClickedListener(listener); 623 } 624 } 625 626 /** 627 * Returns the item Clicked listener. 628 */ 629 public OnItemViewClickedListener getOnItemViewClickedListener() { 630 return mOnItemViewClickedListener; 631 } 632 633 /** 634 * Starts a headers transition. 635 * 636 * <p>This method will begin a transition to either show or hide the 637 * headers, depending on the value of withHeaders. If headers are disabled 638 * for this browse fragment, this method will throw an exception. 639 * 640 * @param withHeaders True if the headers should transition to being shown, 641 * false if the transition should result in headers being hidden. 642 */ 643 public void startHeadersTransition(boolean withHeaders) { 644 if (!mCanShowHeaders) { 645 throw new IllegalStateException("Cannot start headers transition"); 646 } 647 if (isInHeadersTransition() || mShowingHeaders == withHeaders) { 648 return; 649 } 650 startHeadersTransitionInternal(withHeaders); 651 } 652 653 /** 654 * Returns true if the headers transition is currently running. 655 */ 656 public boolean isInHeadersTransition() { 657 return mHeadersTransition != null; 658 } 659 660 /** 661 * Returns true if headers are shown. 662 */ 663 public boolean isShowingHeaders() { 664 return mShowingHeaders; 665 } 666 667 /** 668 * Sets a listener for browse fragment transitions. 669 * 670 * @param listener The listener to call when a browse headers transition 671 * begins or ends. 672 */ 673 public void setBrowseTransitionListener(BrowseTransitionListener listener) { 674 mBrowseTransitionListener = listener; 675 } 676 677 /** 678 * @deprecated use {@link BrowseFragment#enableMainFragmentScaling(boolean)} instead. 679 * 680 * @param enable true to enable row scaling 681 */ 682 public void enableRowScaling(boolean enable) { 683 enableMainFragmentScaling(enable); 684 } 685 686 /** 687 * Enables scaling of main fragment when headers are present. For the page/row fragment, 688 * scaling is enabled only when both this method and 689 * {@link MainFragmentAdapter#isScalingEnabled()} are enabled. 690 * 691 * @param enable true to enable row scaling 692 */ 693 public void enableMainFragmentScaling(boolean enable) { 694 mMainFragmentScaleEnabled = enable; 695 } 696 697 private void startHeadersTransitionInternal(final boolean withHeaders) { 698 if (getFragmentManager().isDestroyed()) { 699 return; 700 } 701 mShowingHeaders = withHeaders; 702 mMainFragmentAdapter.onTransitionPrepare(); 703 mMainFragmentAdapter.onTransitionStart(); 704 onExpandTransitionStart(!withHeaders, new Runnable() { 705 @Override 706 public void run() { 707 mHeadersFragment.onTransitionPrepare(); 708 mHeadersFragment.onTransitionStart(); 709 createHeadersTransition(); 710 if (mBrowseTransitionListener != null) { 711 mBrowseTransitionListener.onHeadersTransitionStart(withHeaders); 712 } 713 TransitionHelper.runTransition( 714 withHeaders ? mSceneWithHeaders : mSceneWithoutHeaders, mHeadersTransition); 715 if (mHeadersBackStackEnabled) { 716 if (!withHeaders) { 717 getFragmentManager().beginTransaction() 718 .addToBackStack(mWithHeadersBackStackName).commit(); 719 } else { 720 int index = mBackStackChangedListener.mIndexOfHeadersBackStack; 721 if (index >= 0) { 722 BackStackEntry entry = getFragmentManager().getBackStackEntryAt(index); 723 getFragmentManager().popBackStackImmediate(entry.getId(), 724 FragmentManager.POP_BACK_STACK_INCLUSIVE); 725 } 726 } 727 } 728 } 729 }); 730 } 731 732 boolean isVerticalScrolling() { 733 // don't run transition 734 return mHeadersFragment.isScrolling() || mMainFragmentAdapter.isScrolling(); 735 } 736 737 738 private final BrowseFrameLayout.OnFocusSearchListener mOnFocusSearchListener = 739 new BrowseFrameLayout.OnFocusSearchListener() { 740 @Override 741 public View onFocusSearch(View focused, int direction) { 742 // if headers is running transition, focus stays 743 if (mCanShowHeaders && isInHeadersTransition()) { 744 return focused; 745 } 746 if (DEBUG) Log.v(TAG, "onFocusSearch focused " + focused + " + direction " + direction); 747 748 if (getTitleView() != null && focused != getTitleView() && 749 direction == View.FOCUS_UP) { 750 return getTitleView(); 751 } 752 if (getTitleView() != null && getTitleView().hasFocus() && 753 direction == View.FOCUS_DOWN) { 754 return mCanShowHeaders && mShowingHeaders ? 755 mHeadersFragment.getVerticalGridView() : mMainFragment.getView(); 756 } 757 758 boolean isRtl = ViewCompat.getLayoutDirection(focused) == View.LAYOUT_DIRECTION_RTL; 759 int towardStart = isRtl ? View.FOCUS_RIGHT : View.FOCUS_LEFT; 760 int towardEnd = isRtl ? View.FOCUS_LEFT : View.FOCUS_RIGHT; 761 if (mCanShowHeaders && direction == towardStart) { 762 if (isVerticalScrolling() || mShowingHeaders) { 763 return focused; 764 } 765 return mHeadersFragment.getVerticalGridView(); 766 } else if (direction == towardEnd) { 767 if (isVerticalScrolling()) { 768 return focused; 769 } 770 return mMainFragment.getView(); 771 } else { 772 return null; 773 } 774 } 775 }; 776 777 private final BrowseFrameLayout.OnChildFocusListener mOnChildFocusListener = 778 new BrowseFrameLayout.OnChildFocusListener() { 779 780 @Override 781 public boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { 782 if (getChildFragmentManager().isDestroyed()) { 783 return true; 784 } 785 // Make sure not changing focus when requestFocus() is called. 786 if (mCanShowHeaders && mShowingHeaders) { 787 if (mHeadersFragment != null && mHeadersFragment.getView() != null && 788 mHeadersFragment.getView().requestFocus(direction, previouslyFocusedRect)) { 789 return true; 790 } 791 } 792 if (mMainFragment != null && mMainFragment.getView() != null && 793 mMainFragment.getView().requestFocus(direction, previouslyFocusedRect)) { 794 return true; 795 } 796 if (getTitleView() != null && 797 getTitleView().requestFocus(direction, previouslyFocusedRect)) { 798 return true; 799 } 800 return false; 801 } 802 803 @Override 804 public void onRequestChildFocus(View child, View focused) { 805 if (getChildFragmentManager().isDestroyed()) { 806 return; 807 } 808 if (!mCanShowHeaders || isInHeadersTransition()) return; 809 int childId = child.getId(); 810 if (childId == R.id.browse_container_dock && mShowingHeaders) { 811 startHeadersTransitionInternal(false); 812 } else if (childId == R.id.browse_headers_dock && !mShowingHeaders) { 813 startHeadersTransitionInternal(true); 814 } 815 } 816 }; 817 818 @Override 819 public void onSaveInstanceState(Bundle outState) { 820 super.onSaveInstanceState(outState); 821 outState.putInt(CURRENT_SELECTED_POSITION, mSelectedPosition); 822 outState.putBoolean(IS_PAGE_ROW, mIsPageRow); 823 824 if (mBackStackChangedListener != null) { 825 mBackStackChangedListener.save(outState); 826 } else { 827 outState.putBoolean(HEADER_SHOW, mShowingHeaders); 828 } 829 } 830 831 @Override 832 public void onCreate(Bundle savedInstanceState) { 833 super.onCreate(savedInstanceState); 834 TypedArray ta = getActivity().obtainStyledAttributes(R.styleable.LeanbackTheme); 835 mContainerListMarginStart = (int) ta.getDimension( 836 R.styleable.LeanbackTheme_browseRowsMarginStart, getActivity().getResources() 837 .getDimensionPixelSize(R.dimen.lb_browse_rows_margin_start)); 838 mContainerListAlignTop = (int) ta.getDimension( 839 R.styleable.LeanbackTheme_browseRowsMarginTop, getActivity().getResources() 840 .getDimensionPixelSize(R.dimen.lb_browse_rows_margin_top)); 841 ta.recycle(); 842 843 readArguments(getArguments()); 844 845 mMainFragmentAdapterRegistry.registerFragment(ListRow.class, new ListRowFragmentFactory()); 846 847 if (mCanShowHeaders) { 848 if (mHeadersBackStackEnabled) { 849 mWithHeadersBackStackName = LB_HEADERS_BACKSTACK + this; 850 mBackStackChangedListener = new BackStackListener(); 851 getFragmentManager().addOnBackStackChangedListener(mBackStackChangedListener); 852 mBackStackChangedListener.load(savedInstanceState); 853 } else { 854 if (savedInstanceState != null) { 855 mShowingHeaders = savedInstanceState.getBoolean(HEADER_SHOW); 856 } 857 } 858 } 859 860 mScaleFactor = getResources().getFraction(R.fraction.lb_browse_rows_scale, 1, 1); 861 } 862 863 @Override 864 public void onDestroyView() { 865 mMainFragmentRowsAdapter = null; 866 mMainFragmentAdapter = null; 867 mMainFragment = null; 868 mHeadersFragment = null; 869 super.onDestroyView(); 870 } 871 872 @Override 873 public void onDestroy() { 874 if (mBackStackChangedListener != null) { 875 getFragmentManager().removeOnBackStackChangedListener(mBackStackChangedListener); 876 } 877 super.onDestroy(); 878 } 879 880 @Override 881 public View onCreateView(LayoutInflater inflater, ViewGroup container, 882 Bundle savedInstanceState) { 883 if (getChildFragmentManager().findFragmentById(R.id.scale_frame) == null) { 884 mHeadersFragment = new HeadersFragment(); 885 886 createMainFragment(mAdapter, mSelectedPosition); 887 FragmentTransaction ft = getChildFragmentManager().beginTransaction() 888 .replace(R.id.browse_headers_dock, mHeadersFragment); 889 890 if (mMainFragment != null) { 891 ft.replace(R.id.scale_frame, mMainFragment); 892 } else { 893 // Empty adapter used to guard against lazy adapter loading. When this 894 // fragment is instantiated, mAdapter might not have the data or might not 895 // have been set. In either of those cases mFragmentAdapter will be null. 896 // This way we can maintain the invariant that mMainFragmentAdapter is never 897 // null and it avoids doing null checks all over the code. 898 mMainFragmentAdapter = new MainFragmentAdapter(null); 899 } 900 901 ft.commit(); 902 } else { 903 mHeadersFragment = (HeadersFragment) getChildFragmentManager() 904 .findFragmentById(R.id.browse_headers_dock); 905 mMainFragment = getChildFragmentManager().findFragmentById(R.id.scale_frame); 906 mMainFragmentAdapter = (MainFragmentAdapter) ((Adaptable)mMainFragment) 907 .getAdapter(MainFragmentAdapter.class); 908 909 mIsPageRow = savedInstanceState != null ? 910 savedInstanceState.getBoolean(IS_PAGE_ROW, false) : false; 911 912 mSelectedPosition = savedInstanceState != null ? 913 savedInstanceState.getInt(CURRENT_SELECTED_POSITION, 0) : 0; 914 if (!mIsPageRow) { 915 mMainFragmentRowsAdapter = (MainFragmentRowsAdapter) ((Adaptable) mMainFragment) 916 .getAdapter(MainFragmentRowsAdapter.class); 917 } else { 918 mMainFragmentRowsAdapter = null; 919 } 920 } 921 922 mHeadersFragment.setHeadersGone(!mCanShowHeaders); 923 if (mHeaderPresenterSelector != null) { 924 mHeadersFragment.setPresenterSelector(mHeaderPresenterSelector); 925 } 926 mHeadersFragment.setAdapter(mAdapter); 927 mHeadersFragment.setOnHeaderViewSelectedListener(mHeaderViewSelectedListener); 928 mHeadersFragment.setOnHeaderClickedListener(mHeaderClickedListener); 929 930 View root = inflater.inflate(R.layout.lb_browse_fragment, container, false); 931 932 setTitleView((TitleView) root.findViewById(R.id.browse_title_group)); 933 934 mBrowseFrame = (BrowseFrameLayout) root.findViewById(R.id.browse_frame); 935 mBrowseFrame.setOnChildFocusListener(mOnChildFocusListener); 936 mBrowseFrame.setOnFocusSearchListener(mOnFocusSearchListener); 937 938 mScaleFrameLayout = (ScaleFrameLayout) root.findViewById(R.id.scale_frame); 939 mScaleFrameLayout.setPivotX(0); 940 mScaleFrameLayout.setPivotY(mContainerListAlignTop); 941 942 setupMainFragment(); 943 944 if (mBrandColorSet) { 945 mHeadersFragment.setBackgroundColor(mBrandColor); 946 } 947 948 mSceneWithHeaders = TransitionHelper.createScene(mBrowseFrame, new Runnable() { 949 @Override 950 public void run() { 951 showHeaders(true); 952 } 953 }); 954 mSceneWithoutHeaders = TransitionHelper.createScene(mBrowseFrame, new Runnable() { 955 @Override 956 public void run() { 957 showHeaders(false); 958 } 959 }); 960 mSceneAfterEntranceTransition = TransitionHelper.createScene(mBrowseFrame, new Runnable() { 961 @Override 962 public void run() { 963 setEntranceTransitionEndState(); 964 } 965 }); 966 return root; 967 } 968 969 private void setupMainFragment() { 970 if (mMainFragmentRowsAdapter != null) { 971 mMainFragmentRowsAdapter.setAdapter(mAdapter); 972 mMainFragmentRowsAdapter.setOnItemViewSelectedListener(mRowViewSelectedListener); 973 mMainFragmentRowsAdapter.setOnItemViewClickedListener(mOnItemViewClickedListener); 974 } 975 } 976 977 private void createHeadersTransition() { 978 mHeadersTransition = TransitionHelper.loadTransition(getActivity(), 979 mShowingHeaders ? 980 R.transition.lb_browse_headers_in : R.transition.lb_browse_headers_out); 981 982 TransitionHelper.addTransitionListener(mHeadersTransition, new TransitionListener() { 983 @Override 984 public void onTransitionStart(Object transition) { 985 } 986 @Override 987 public void onTransitionEnd(Object transition) { 988 mHeadersTransition = null; 989 mMainFragmentAdapter.onTransitionEnd(); 990 mHeadersFragment.onTransitionEnd(); 991 if (mShowingHeaders) { 992 VerticalGridView headerGridView = mHeadersFragment.getVerticalGridView(); 993 if (headerGridView != null && !headerGridView.hasFocus()) { 994 headerGridView.requestFocus(); 995 } 996 } else { 997 View rowsGridView = mMainFragment.getView(); 998 if (rowsGridView != null && !rowsGridView.hasFocus()) { 999 rowsGridView.requestFocus(); 1000 } 1001 } 1002 if (mBrowseTransitionListener != null) { 1003 mBrowseTransitionListener.onHeadersTransitionStop(mShowingHeaders); 1004 } 1005 } 1006 }); 1007 } 1008 1009 /** 1010 * Sets the {@link PresenterSelector} used to render the row headers. 1011 * 1012 * @param headerPresenterSelector The PresenterSelector that will determine 1013 * the Presenter for each row header. 1014 */ 1015 public void setHeaderPresenterSelector(PresenterSelector headerPresenterSelector) { 1016 mHeaderPresenterSelector = headerPresenterSelector; 1017 if (mHeadersFragment != null) { 1018 mHeadersFragment.setPresenterSelector(mHeaderPresenterSelector); 1019 } 1020 } 1021 1022 private void setHeadersOnScreen(boolean onScreen) { 1023 MarginLayoutParams lp; 1024 View containerList; 1025 containerList = mHeadersFragment.getView(); 1026 lp = (MarginLayoutParams) containerList.getLayoutParams(); 1027 lp.setMarginStart(onScreen ? 0 : -mContainerListMarginStart); 1028 containerList.setLayoutParams(lp); 1029 } 1030 1031 private void showHeaders(boolean show) { 1032 if (DEBUG) Log.v(TAG, "showHeaders " + show); 1033 mHeadersFragment.setHeadersEnabled(show); 1034 setHeadersOnScreen(show); 1035 expandMainFragment(!show); 1036 } 1037 1038 private void expandMainFragment(boolean expand) { 1039 MarginLayoutParams params = (MarginLayoutParams) mScaleFrameLayout.getLayoutParams(); 1040 params.leftMargin = !expand ? mContainerListMarginStart : 0; 1041 mScaleFrameLayout.setLayoutParams(params); 1042 mMainFragmentAdapter.setExpand(expand); 1043 1044 setMainFragmentAlignment(); 1045 final float scaleFactor = !expand 1046 && mMainFragmentScaleEnabled 1047 && mMainFragmentAdapter.isScalingEnabled() ? mScaleFactor : 1; 1048 mScaleFrameLayout.setLayoutScaleY(scaleFactor); 1049 mScaleFrameLayout.setChildScale(scaleFactor); 1050 } 1051 1052 private HeadersFragment.OnHeaderClickedListener mHeaderClickedListener = 1053 new HeadersFragment.OnHeaderClickedListener() { 1054 @Override 1055 public void onHeaderClicked(RowHeaderPresenter.ViewHolder viewHolder, Row row) { 1056 if (!mCanShowHeaders || !mShowingHeaders || isInHeadersTransition()) { 1057 return; 1058 } 1059 startHeadersTransitionInternal(false); 1060 mMainFragment.getView().requestFocus(); 1061 } 1062 }; 1063 1064 private OnItemViewSelectedListener mRowViewSelectedListener = new OnItemViewSelectedListener() { 1065 @Override 1066 public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item, 1067 RowPresenter.ViewHolder rowViewHolder, Row row) { 1068 if (mMainFragment == null) { 1069 return; 1070 } 1071 1072 int position = ((RowsFragment) mMainFragment) 1073 .getVerticalGridView().getSelectedPosition(); 1074 if (DEBUG) Log.v(TAG, "row selected position " + position); 1075 onRowSelected(position); 1076 if (mExternalOnItemViewSelectedListener != null) { 1077 mExternalOnItemViewSelectedListener.onItemSelected(itemViewHolder, item, 1078 rowViewHolder, row); 1079 } 1080 } 1081 }; 1082 1083 private HeadersFragment.OnHeaderViewSelectedListener mHeaderViewSelectedListener = 1084 new HeadersFragment.OnHeaderViewSelectedListener() { 1085 @Override 1086 public void onHeaderSelected(RowHeaderPresenter.ViewHolder viewHolder, Row row) { 1087 int position = mHeadersFragment.getVerticalGridView().getSelectedPosition(); 1088 if (DEBUG) Log.v(TAG, "header selected position " + position); 1089 onRowSelected(position); 1090 } 1091 }; 1092 1093 private void onRowSelected(int position) { 1094 if (position != mSelectedPosition) { 1095 mSetSelectionRunnable.post( 1096 position, SetSelectionRunnable.TYPE_INTERNAL_SYNC, true); 1097 1098 if (getAdapter() == null || getAdapter().size() == 0 || position == 0) { 1099 showTitle(true); 1100 } else { 1101 showTitle(false); 1102 } 1103 } 1104 } 1105 1106 private void setSelection(int position, boolean smooth) { 1107 if (position == NO_POSITION) { 1108 return; 1109 } 1110 1111 mHeadersFragment.setSelectedPosition(position, smooth); 1112 replaceMainFragment(position); 1113 1114 if (mMainFragmentRowsAdapter != null) { 1115 mMainFragmentRowsAdapter.setSelectedPosition(position, smooth); 1116 } 1117 mSelectedPosition = position; 1118 } 1119 1120 private void replaceMainFragment(int position) { 1121 if (createMainFragment(mAdapter, position)) { 1122 swapBrowseContent(mMainFragment); 1123 expandMainFragment(!(mCanShowHeaders && mShowingHeaders)); 1124 setupMainFragment(); 1125 } 1126 } 1127 1128 private void swapBrowseContent(Fragment fragment) { 1129 getChildFragmentManager().beginTransaction().replace(R.id.scale_frame, fragment).commit(); 1130 } 1131 1132 /** 1133 * Sets the selected row position with smooth animation. 1134 */ 1135 public void setSelectedPosition(int position) { 1136 setSelectedPosition(position, true); 1137 } 1138 1139 /** 1140 * Gets position of currently selected row. 1141 * @return Position of currently selected row. 1142 */ 1143 public int getSelectedPosition() { 1144 return mSelectedPosition; 1145 } 1146 1147 /** 1148 * Sets the selected row position. 1149 */ 1150 public void setSelectedPosition(int position, boolean smooth) { 1151 mSetSelectionRunnable.post( 1152 position, SetSelectionRunnable.TYPE_USER_REQUEST, smooth); 1153 } 1154 1155 /** 1156 * Selects a Row and perform an optional task on the Row. For example 1157 * <code>setSelectedPosition(10, true, new ListRowPresenterSelectItemViewHolderTask(5))</code> 1158 * scrolls to 11th row and selects 6th item on that row. The method will be ignored if 1159 * RowsFragment has not been created (i.e. before {@link #onCreateView(LayoutInflater, 1160 * ViewGroup, Bundle)}). 1161 * 1162 * @param rowPosition Which row to select. 1163 * @param smooth True to scroll to the row, false for no animation. 1164 * @param rowHolderTask Optional task to perform on the Row. When the task is not null, headers 1165 * fragment will be collapsed. 1166 */ 1167 public void setSelectedPosition(int rowPosition, boolean smooth, 1168 final Presenter.ViewHolderTask rowHolderTask) { 1169 if (mMainFragmentAdapterRegistry == null) { 1170 return; 1171 } 1172 if (rowHolderTask != null) { 1173 startHeadersTransition(false); 1174 } 1175 if (mMainFragmentRowsAdapter != null) { 1176 mMainFragmentRowsAdapter.setSelectedPosition(rowPosition, smooth, rowHolderTask); 1177 } 1178 } 1179 1180 @Override 1181 public void onStart() { 1182 super.onStart(); 1183 mHeadersFragment.setAlignment(mContainerListAlignTop); 1184 setMainFragmentAlignment(); 1185 1186 if (mCanShowHeaders && mShowingHeaders && mHeadersFragment.getView() != null) { 1187 mHeadersFragment.getView().requestFocus(); 1188 } else if ((!mCanShowHeaders || !mShowingHeaders) 1189 && mMainFragment.getView() != null) { 1190 mMainFragment.getView().requestFocus(); 1191 } 1192 1193 if (mCanShowHeaders) { 1194 showHeaders(mShowingHeaders); 1195 } 1196 1197 if (isEntranceTransitionEnabled()) { 1198 setEntranceTransitionStartState(); 1199 } 1200 } 1201 1202 private void onExpandTransitionStart(boolean expand, final Runnable callback) { 1203 if (expand) { 1204 callback.run(); 1205 return; 1206 } 1207 // Run a "pre" layout when we go non-expand, in order to get the initial 1208 // positions of added rows. 1209 new ExpandPreLayout(callback, mMainFragmentAdapter, getView()).execute(); 1210 } 1211 1212 private void setMainFragmentAlignment() { 1213 int alignOffset = mContainerListAlignTop; 1214 if (mMainFragmentScaleEnabled 1215 && mMainFragmentAdapter.isScalingEnabled() 1216 && mShowingHeaders) { 1217 alignOffset = (int) (alignOffset / mScaleFactor + 0.5f); 1218 } 1219 mMainFragmentAdapter.setAlignment(alignOffset); 1220 } 1221 1222 /** 1223 * Enables/disables headers transition on back key support. This is enabled by 1224 * default. The BrowseFragment will add a back stack entry when headers are 1225 * showing. Running a headers transition when the back key is pressed only 1226 * works when the headers state is {@link #HEADERS_ENABLED} or 1227 * {@link #HEADERS_HIDDEN}. 1228 * <p> 1229 * NOTE: If an Activity has its own onBackPressed() handling, you must 1230 * disable this feature. You may use {@link #startHeadersTransition(boolean)} 1231 * and {@link BrowseTransitionListener} in your own back stack handling. 1232 */ 1233 public final void setHeadersTransitionOnBackEnabled(boolean headersBackStackEnabled) { 1234 mHeadersBackStackEnabled = headersBackStackEnabled; 1235 } 1236 1237 /** 1238 * Returns true if headers transition on back key support is enabled. 1239 */ 1240 public final boolean isHeadersTransitionOnBackEnabled() { 1241 return mHeadersBackStackEnabled; 1242 } 1243 1244 private void readArguments(Bundle args) { 1245 if (args == null) { 1246 return; 1247 } 1248 if (args.containsKey(ARG_TITLE)) { 1249 setTitle(args.getString(ARG_TITLE)); 1250 } 1251 if (args.containsKey(ARG_HEADERS_STATE)) { 1252 setHeadersState(args.getInt(ARG_HEADERS_STATE)); 1253 } 1254 } 1255 1256 /** 1257 * Sets the state for the headers column in the browse fragment. Must be one 1258 * of {@link #HEADERS_ENABLED}, {@link #HEADERS_HIDDEN}, or 1259 * {@link #HEADERS_DISABLED}. 1260 * 1261 * @param headersState The state of the headers for the browse fragment. 1262 */ 1263 public void setHeadersState(int headersState) { 1264 if (headersState < HEADERS_ENABLED || headersState > HEADERS_DISABLED) { 1265 throw new IllegalArgumentException("Invalid headers state: " + headersState); 1266 } 1267 if (DEBUG) Log.v(TAG, "setHeadersState " + headersState); 1268 1269 if (headersState != mHeadersState) { 1270 mHeadersState = headersState; 1271 switch (headersState) { 1272 case HEADERS_ENABLED: 1273 mCanShowHeaders = true; 1274 mShowingHeaders = true; 1275 break; 1276 case HEADERS_HIDDEN: 1277 mCanShowHeaders = true; 1278 mShowingHeaders = false; 1279 break; 1280 case HEADERS_DISABLED: 1281 mCanShowHeaders = false; 1282 mShowingHeaders = false; 1283 break; 1284 default: 1285 Log.w(TAG, "Unknown headers state: " + headersState); 1286 break; 1287 } 1288 if (mHeadersFragment != null) { 1289 mHeadersFragment.setHeadersGone(!mCanShowHeaders); 1290 } 1291 } 1292 } 1293 1294 /** 1295 * Returns the state of the headers column in the browse fragment. 1296 */ 1297 public int getHeadersState() { 1298 return mHeadersState; 1299 } 1300 1301 @Override 1302 protected Object createEntranceTransition() { 1303 return TransitionHelper.loadTransition(getActivity(), 1304 R.transition.lb_browse_entrance_transition); 1305 } 1306 1307 @Override 1308 protected void runEntranceTransition(Object entranceTransition) { 1309 TransitionHelper.runTransition(mSceneAfterEntranceTransition, entranceTransition); 1310 } 1311 1312 @Override 1313 protected void onEntranceTransitionPrepare() { 1314 mHeadersFragment.onTransitionPrepare(); 1315 mMainFragmentAdapter.onTransitionPrepare(); 1316 } 1317 1318 @Override 1319 protected void onEntranceTransitionStart() { 1320 mHeadersFragment.onTransitionStart(); 1321 mMainFragmentAdapter.onTransitionStart(); 1322 } 1323 1324 @Override 1325 protected void onEntranceTransitionEnd() { 1326 mMainFragmentAdapter.onTransitionEnd(); 1327 mHeadersFragment.onTransitionEnd(); 1328 } 1329 1330 void setSearchOrbViewOnScreen(boolean onScreen) { 1331 View searchOrbView = getTitleView().getSearchAffordanceView(); 1332 MarginLayoutParams lp = (MarginLayoutParams) searchOrbView.getLayoutParams(); 1333 lp.setMarginStart(onScreen ? 0 : -mContainerListMarginStart); 1334 searchOrbView.setLayoutParams(lp); 1335 } 1336 1337 void setEntranceTransitionStartState() { 1338 setHeadersOnScreen(false); 1339 setSearchOrbViewOnScreen(false); 1340 mMainFragmentAdapter.setEntranceTransitionState(false); 1341 } 1342 1343 void setEntranceTransitionEndState() { 1344 setHeadersOnScreen(mShowingHeaders); 1345 setSearchOrbViewOnScreen(true); 1346 mMainFragmentAdapter.setEntranceTransitionState(true); 1347 } 1348 1349 private static class ExpandPreLayout implements ViewTreeObserver.OnPreDrawListener { 1350 1351 private final View mView; 1352 private final Runnable mCallback; 1353 private int mState; 1354 private MainFragmentAdapter mainFragmentAdapter; 1355 1356 final static int STATE_INIT = 0; 1357 final static int STATE_FIRST_DRAW = 1; 1358 final static int STATE_SECOND_DRAW = 2; 1359 1360 ExpandPreLayout(Runnable callback, MainFragmentAdapter adapter, View view) { 1361 mView = view; 1362 mCallback = callback; 1363 mainFragmentAdapter = adapter; 1364 } 1365 1366 void execute() { 1367 mView.getViewTreeObserver().addOnPreDrawListener(this); 1368 mainFragmentAdapter.setExpand(false); 1369 mState = STATE_INIT; 1370 } 1371 1372 @Override 1373 public boolean onPreDraw() { 1374 if (mState == STATE_INIT) { 1375 mainFragmentAdapter.setExpand(true); 1376 mState = STATE_FIRST_DRAW; 1377 } else if (mState == STATE_FIRST_DRAW) { 1378 mCallback.run(); 1379 mView.getViewTreeObserver().removeOnPreDrawListener(this); 1380 mState = STATE_SECOND_DRAW; 1381 } 1382 return false; 1383 } 1384 } 1385} 1386