BrowseFragment.java revision 0670f090a011e864bd726784c2a85333bf2ae7fb
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 android.support.annotation.ColorInt; 17import android.support.v17.leanback.R; 18import android.support.v17.leanback.transition.LeanbackTransitionHelper; 19import android.support.v17.leanback.transition.TransitionHelper; 20import android.support.v17.leanback.transition.TransitionListener; 21import android.support.v17.leanback.widget.BrowseFrameLayout; 22import android.support.v17.leanback.widget.HorizontalGridView; 23import android.support.v17.leanback.widget.ItemBridgeAdapter; 24import android.support.v17.leanback.widget.OnItemViewClickedListener; 25import android.support.v17.leanback.widget.OnItemViewSelectedListener; 26import android.support.v17.leanback.widget.Presenter; 27import android.support.v17.leanback.widget.PresenterSelector; 28import android.support.v17.leanback.widget.RowHeaderPresenter; 29import android.support.v17.leanback.widget.RowPresenter; 30import android.support.v17.leanback.widget.TitleView; 31import android.support.v17.leanback.widget.VerticalGridView; 32import android.support.v17.leanback.widget.Row; 33import android.support.v17.leanback.widget.ObjectAdapter; 34import android.support.v17.leanback.widget.SearchOrbView; 35import android.support.v4.view.ViewCompat; 36import android.util.Log; 37import android.app.Activity; 38import android.app.Fragment; 39import android.app.FragmentManager; 40import android.app.FragmentManager.BackStackEntry; 41import android.content.Context; 42import android.content.res.TypedArray; 43import android.os.Bundle; 44import android.view.LayoutInflater; 45import android.view.View; 46import android.view.View.OnClickListener; 47import android.view.ViewGroup; 48import android.view.ViewGroup.MarginLayoutParams; 49import android.view.ViewTreeObserver; 50import android.graphics.Color; 51import android.graphics.Rect; 52import android.graphics.drawable.Drawable; 53import static android.support.v7.widget.RecyclerView.NO_POSITION; 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 84 85 final class BackStackListener implements FragmentManager.OnBackStackChangedListener { 86 int mLastEntryCount; 87 int mIndexOfHeadersBackStack; 88 89 BackStackListener() { 90 mLastEntryCount = getFragmentManager().getBackStackEntryCount(); 91 mIndexOfHeadersBackStack = -1; 92 } 93 94 void load(Bundle savedInstanceState) { 95 if (savedInstanceState != null) { 96 mIndexOfHeadersBackStack = savedInstanceState.getInt(HEADER_STACK_INDEX, -1); 97 mShowingHeaders = mIndexOfHeadersBackStack == -1; 98 } else { 99 if (!mShowingHeaders) { 100 getFragmentManager().beginTransaction() 101 .addToBackStack(mWithHeadersBackStackName).commit(); 102 } 103 } 104 } 105 106 void save(Bundle outState) { 107 outState.putInt(HEADER_STACK_INDEX, mIndexOfHeadersBackStack); 108 } 109 110 111 @Override 112 public void onBackStackChanged() { 113 if (getFragmentManager() == null) { 114 Log.w(TAG, "getFragmentManager() is null, stack:", new Exception()); 115 return; 116 } 117 int count = getFragmentManager().getBackStackEntryCount(); 118 // if backstack is growing and last pushed entry is "headers" backstack, 119 // remember the index of the entry. 120 if (count > mLastEntryCount) { 121 BackStackEntry entry = getFragmentManager().getBackStackEntryAt(count - 1); 122 if (mWithHeadersBackStackName.equals(entry.getName())) { 123 mIndexOfHeadersBackStack = count - 1; 124 } 125 } else if (count < mLastEntryCount) { 126 // if popped "headers" backstack, initiate the show header transition if needed 127 if (mIndexOfHeadersBackStack >= count) { 128 mIndexOfHeadersBackStack = -1; 129 if (!mShowingHeaders) { 130 startHeadersTransitionInternal(true); 131 } 132 } 133 } 134 mLastEntryCount = count; 135 } 136 } 137 138 /** 139 * Listener for transitions between browse headers and rows. 140 */ 141 public static class BrowseTransitionListener { 142 /** 143 * Callback when headers transition starts. 144 * 145 * @param withHeaders True if the transition will result in headers 146 * being shown, false otherwise. 147 */ 148 public void onHeadersTransitionStart(boolean withHeaders) { 149 } 150 /** 151 * Callback when headers transition stops. 152 * 153 * @param withHeaders True if the transition will result in headers 154 * being shown, false otherwise. 155 */ 156 public void onHeadersTransitionStop(boolean withHeaders) { 157 } 158 } 159 160 private class SetSelectionRunnable implements Runnable { 161 static final int TYPE_INVALID = -1; 162 static final int TYPE_INTERNAL_SYNC = 0; 163 static final int TYPE_USER_REQUEST = 1; 164 165 private int mPosition; 166 private int mType; 167 private boolean mSmooth; 168 169 SetSelectionRunnable() { 170 reset(); 171 } 172 173 void post(int position, int type, boolean smooth) { 174 // Posting the set selection, rather than calling it immediately, prevents an issue 175 // with adapter changes. Example: a row is added before the current selected row; 176 // first the fast lane view updates its selection, then the rows fragment has that 177 // new selection propagated immediately; THEN the rows view processes the same adapter 178 // change and moves the selection again. 179 if (type >= mType) { 180 mPosition = position; 181 mType = type; 182 mSmooth = smooth; 183 mBrowseFrame.removeCallbacks(this); 184 mBrowseFrame.post(this); 185 } 186 } 187 188 @Override 189 public void run() { 190 setSelection(mPosition, mSmooth); 191 reset(); 192 } 193 194 private void reset() { 195 mPosition = -1; 196 mType = TYPE_INVALID; 197 mSmooth = false; 198 } 199 } 200 201 private static final String TAG = "BrowseFragment"; 202 203 private static final String LB_HEADERS_BACKSTACK = "lbHeadersBackStack_"; 204 205 private static boolean DEBUG = false; 206 207 /** The headers fragment is enabled and shown by default. */ 208 public static final int HEADERS_ENABLED = 1; 209 210 /** The headers fragment is enabled and hidden by default. */ 211 public static final int HEADERS_HIDDEN = 2; 212 213 /** The headers fragment is disabled and will never be shown. */ 214 public static final int HEADERS_DISABLED = 3; 215 216 private RowsFragment mRowsFragment; 217 private HeadersFragment mHeadersFragment; 218 219 private ObjectAdapter mAdapter; 220 221 private int mHeadersState = HEADERS_ENABLED; 222 private int mBrandColor = Color.TRANSPARENT; 223 private boolean mBrandColorSet; 224 225 private BrowseFrameLayout mBrowseFrame; 226 private boolean mHeadersBackStackEnabled = true; 227 private String mWithHeadersBackStackName; 228 private boolean mShowingHeaders = true; 229 private boolean mCanShowHeaders = true; 230 private int mContainerListMarginStart; 231 private int mContainerListAlignTop; 232 private boolean mRowScaleEnabled = true; 233 private OnItemViewSelectedListener mExternalOnItemViewSelectedListener; 234 private OnItemViewClickedListener mOnItemViewClickedListener; 235 private int mSelectedPosition = -1; 236 237 private PresenterSelector mHeaderPresenterSelector; 238 private final SetSelectionRunnable mSetSelectionRunnable = new SetSelectionRunnable(); 239 240 // transition related: 241 private Object mSceneWithHeaders; 242 private Object mSceneWithoutHeaders; 243 private Object mSceneAfterEntranceTransition; 244 private Object mHeadersTransition; 245 private BackStackListener mBackStackChangedListener; 246 private BrowseTransitionListener mBrowseTransitionListener; 247 248 private static final String ARG_TITLE = BrowseFragment.class.getCanonicalName() + ".title"; 249 private static final String ARG_BADGE_URI = BrowseFragment.class.getCanonicalName() + ".badge"; 250 private static final String ARG_HEADERS_STATE = 251 BrowseFragment.class.getCanonicalName() + ".headersState"; 252 253 /** 254 * Creates arguments for a browse fragment. 255 * 256 * @param args The Bundle to place arguments into, or null if the method 257 * should return a new Bundle. 258 * @param title The title of the BrowseFragment. 259 * @param headersState The initial state of the headers of the 260 * BrowseFragment. Must be one of {@link #HEADERS_ENABLED}, {@link 261 * #HEADERS_HIDDEN}, or {@link #HEADERS_DISABLED}. 262 * @return A Bundle with the given arguments for creating a BrowseFragment. 263 */ 264 public static Bundle createArgs(Bundle args, String title, int headersState) { 265 if (args == null) { 266 args = new Bundle(); 267 } 268 args.putString(ARG_TITLE, title); 269 args.putInt(ARG_HEADERS_STATE, headersState); 270 return args; 271 } 272 273 /** 274 * Sets the brand color for the browse fragment. The brand color is used as 275 * the primary color for UI elements in the browse fragment. For example, 276 * the background color of the headers fragment uses the brand color. 277 * 278 * @param color The color to use as the brand color of the fragment. 279 */ 280 public void setBrandColor(@ColorInt int color) { 281 mBrandColor = color; 282 mBrandColorSet = true; 283 284 if (mHeadersFragment != null) { 285 mHeadersFragment.setBackgroundColor(mBrandColor); 286 } 287 } 288 289 /** 290 * Returns the brand color for the browse fragment. 291 * The default is transparent. 292 */ 293 @ColorInt 294 public int getBrandColor() { 295 return mBrandColor; 296 } 297 298 /** 299 * Sets the adapter containing the rows for the fragment. 300 * 301 * <p>The items referenced by the adapter must be be derived from 302 * {@link Row}. These rows will be used by the rows fragment and the headers 303 * fragment (if not disabled) to render the browse rows. 304 * 305 * @param adapter An ObjectAdapter for the browse rows. All items must 306 * derive from {@link Row}. 307 */ 308 public void setAdapter(ObjectAdapter adapter) { 309 mAdapter = adapter; 310 if (mRowsFragment != null) { 311 mRowsFragment.setAdapter(adapter); 312 mHeadersFragment.setAdapter(adapter); 313 } 314 } 315 316 /** 317 * Returns the adapter containing the rows for the fragment. 318 */ 319 public ObjectAdapter getAdapter() { 320 return mAdapter; 321 } 322 323 /** 324 * Sets an item selection listener. 325 */ 326 public void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) { 327 mExternalOnItemViewSelectedListener = listener; 328 } 329 330 /** 331 * Returns an item selection listener. 332 */ 333 public OnItemViewSelectedListener getOnItemViewSelectedListener() { 334 return mExternalOnItemViewSelectedListener; 335 } 336 337 /** 338 * Sets an item clicked listener on the fragment. 339 * OnItemViewClickedListener will override {@link View.OnClickListener} that 340 * item presenter sets during {@link Presenter#onCreateViewHolder(ViewGroup)}. 341 * So in general, developer should choose one of the listeners but not both. 342 */ 343 public void setOnItemViewClickedListener(OnItemViewClickedListener listener) { 344 mOnItemViewClickedListener = listener; 345 if (mRowsFragment != null) { 346 mRowsFragment.setOnItemViewClickedListener(listener); 347 } 348 } 349 350 /** 351 * Returns the item Clicked listener. 352 */ 353 public OnItemViewClickedListener getOnItemViewClickedListener() { 354 return mOnItemViewClickedListener; 355 } 356 357 /** 358 * Starts a headers transition. 359 * 360 * <p>This method will begin a transition to either show or hide the 361 * headers, depending on the value of withHeaders. If headers are disabled 362 * for this browse fragment, this method will throw an exception. 363 * 364 * @param withHeaders True if the headers should transition to being shown, 365 * false if the transition should result in headers being hidden. 366 */ 367 public void startHeadersTransition(boolean withHeaders) { 368 if (!mCanShowHeaders) { 369 throw new IllegalStateException("Cannot start headers transition"); 370 } 371 if (isInHeadersTransition() || mShowingHeaders == withHeaders) { 372 return; 373 } 374 startHeadersTransitionInternal(withHeaders); 375 } 376 377 /** 378 * Returns true if the headers transition is currently running. 379 */ 380 public boolean isInHeadersTransition() { 381 return mHeadersTransition != null; 382 } 383 384 /** 385 * Returns true if headers are shown. 386 */ 387 public boolean isShowingHeaders() { 388 return mShowingHeaders; 389 } 390 391 /** 392 * Sets a listener for browse fragment transitions. 393 * 394 * @param listener The listener to call when a browse headers transition 395 * begins or ends. 396 */ 397 public void setBrowseTransitionListener(BrowseTransitionListener listener) { 398 mBrowseTransitionListener = listener; 399 } 400 401 /** 402 * Enables scaling of rows when headers are present. 403 * By default enabled to increase density. 404 * 405 * @param enable true to enable row scaling 406 */ 407 public void enableRowScaling(boolean enable) { 408 mRowScaleEnabled = enable; 409 if (mRowsFragment != null) { 410 mRowsFragment.enableRowScaling(mRowScaleEnabled); 411 } 412 } 413 414 private void startHeadersTransitionInternal(final boolean withHeaders) { 415 if (getFragmentManager().isDestroyed()) { 416 return; 417 } 418 mShowingHeaders = withHeaders; 419 mRowsFragment.onExpandTransitionStart(!withHeaders, new Runnable() { 420 @Override 421 public void run() { 422 mHeadersFragment.onTransitionStart(); 423 createHeadersTransition(); 424 if (mBrowseTransitionListener != null) { 425 mBrowseTransitionListener.onHeadersTransitionStart(withHeaders); 426 } 427 sTransitionHelper.runTransition(withHeaders ? mSceneWithHeaders : mSceneWithoutHeaders, 428 mHeadersTransition); 429 if (mHeadersBackStackEnabled) { 430 if (!withHeaders) { 431 getFragmentManager().beginTransaction() 432 .addToBackStack(mWithHeadersBackStackName).commit(); 433 } else { 434 int index = mBackStackChangedListener.mIndexOfHeadersBackStack; 435 if (index >= 0) { 436 BackStackEntry entry = getFragmentManager().getBackStackEntryAt(index); 437 getFragmentManager().popBackStackImmediate(entry.getId(), 438 FragmentManager.POP_BACK_STACK_INCLUSIVE); 439 } 440 } 441 } 442 } 443 }); 444 } 445 446 private boolean isVerticalScrolling() { 447 // don't run transition 448 return mHeadersFragment.getVerticalGridView().getScrollState() 449 != HorizontalGridView.SCROLL_STATE_IDLE 450 || mRowsFragment.getVerticalGridView().getScrollState() 451 != HorizontalGridView.SCROLL_STATE_IDLE; 452 } 453 454 455 private final BrowseFrameLayout.OnFocusSearchListener mOnFocusSearchListener = 456 new BrowseFrameLayout.OnFocusSearchListener() { 457 @Override 458 public View onFocusSearch(View focused, int direction) { 459 // if headers is running transition, focus stays 460 if (mCanShowHeaders && isInHeadersTransition()) { 461 return focused; 462 } 463 if (DEBUG) Log.v(TAG, "onFocusSearch focused " + focused + " + direction " + direction); 464 465 if (getTitleView() != null && focused != getTitleView() && 466 direction == View.FOCUS_UP) { 467 return getTitleView(); 468 } 469 if (getTitleView() != null && getTitleView().hasFocus() && 470 direction == View.FOCUS_DOWN) { 471 return mCanShowHeaders && mShowingHeaders ? 472 mHeadersFragment.getVerticalGridView() : 473 mRowsFragment.getVerticalGridView(); 474 } 475 476 boolean isRtl = ViewCompat.getLayoutDirection(focused) == View.LAYOUT_DIRECTION_RTL; 477 int towardStart = isRtl ? View.FOCUS_RIGHT : View.FOCUS_LEFT; 478 int towardEnd = isRtl ? View.FOCUS_LEFT : View.FOCUS_RIGHT; 479 if (mCanShowHeaders && direction == towardStart) { 480 if (isVerticalScrolling() || mShowingHeaders) { 481 return focused; 482 } 483 return mHeadersFragment.getVerticalGridView(); 484 } else if (direction == towardEnd) { 485 if (isVerticalScrolling()) { 486 return focused; 487 } 488 return mRowsFragment.getVerticalGridView(); 489 } else { 490 return null; 491 } 492 } 493 }; 494 495 private final BrowseFrameLayout.OnChildFocusListener mOnChildFocusListener = 496 new BrowseFrameLayout.OnChildFocusListener() { 497 498 @Override 499 public boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { 500 if (getChildFragmentManager().isDestroyed()) { 501 return true; 502 } 503 // Make sure not changing focus when requestFocus() is called. 504 if (mCanShowHeaders && mShowingHeaders) { 505 if (mHeadersFragment != null && mHeadersFragment.getView() != null && 506 mHeadersFragment.getView().requestFocus(direction, previouslyFocusedRect)) { 507 return true; 508 } 509 } 510 if (mRowsFragment != null && mRowsFragment.getView() != null && 511 mRowsFragment.getView().requestFocus(direction, previouslyFocusedRect)) { 512 return true; 513 } 514 if (getTitleView() != null && 515 getTitleView().requestFocus(direction, previouslyFocusedRect)) { 516 return true; 517 } 518 return false; 519 }; 520 521 @Override 522 public void onRequestChildFocus(View child, View focused) { 523 if (getChildFragmentManager().isDestroyed()) { 524 return; 525 } 526 if (!mCanShowHeaders || isInHeadersTransition()) return; 527 int childId = child.getId(); 528 if (childId == R.id.browse_container_dock && mShowingHeaders) { 529 startHeadersTransitionInternal(false); 530 } else if (childId == R.id.browse_headers_dock && !mShowingHeaders) { 531 startHeadersTransitionInternal(true); 532 } 533 } 534 }; 535 536 @Override 537 public void onSaveInstanceState(Bundle outState) { 538 super.onSaveInstanceState(outState); 539 if (mBackStackChangedListener != null) { 540 mBackStackChangedListener.save(outState); 541 } else { 542 outState.putBoolean(HEADER_SHOW, mShowingHeaders); 543 } 544 } 545 546 @Override 547 public void onCreate(Bundle savedInstanceState) { 548 super.onCreate(savedInstanceState); 549 TypedArray ta = getActivity().obtainStyledAttributes(R.styleable.LeanbackTheme); 550 mContainerListMarginStart = (int) ta.getDimension( 551 R.styleable.LeanbackTheme_browseRowsMarginStart, getActivity().getResources() 552 .getDimensionPixelSize(R.dimen.lb_browse_rows_margin_start)); 553 mContainerListAlignTop = (int) ta.getDimension( 554 R.styleable.LeanbackTheme_browseRowsMarginTop, getActivity().getResources() 555 .getDimensionPixelSize(R.dimen.lb_browse_rows_margin_top)); 556 ta.recycle(); 557 558 readArguments(getArguments()); 559 560 if (mCanShowHeaders) { 561 if (mHeadersBackStackEnabled) { 562 mWithHeadersBackStackName = LB_HEADERS_BACKSTACK + this; 563 mBackStackChangedListener = new BackStackListener(); 564 getFragmentManager().addOnBackStackChangedListener(mBackStackChangedListener); 565 mBackStackChangedListener.load(savedInstanceState); 566 } else { 567 if (savedInstanceState != null) { 568 mShowingHeaders = savedInstanceState.getBoolean(HEADER_SHOW); 569 } 570 } 571 } 572 } 573 574 @Override 575 public void onDestroy() { 576 if (mBackStackChangedListener != null) { 577 getFragmentManager().removeOnBackStackChangedListener(mBackStackChangedListener); 578 } 579 super.onDestroy(); 580 } 581 582 @Override 583 public View onCreateView(LayoutInflater inflater, ViewGroup container, 584 Bundle savedInstanceState) { 585 if (getChildFragmentManager().findFragmentById(R.id.browse_container_dock) == null) { 586 mRowsFragment = new RowsFragment(); 587 mHeadersFragment = new HeadersFragment(); 588 getChildFragmentManager().beginTransaction() 589 .replace(R.id.browse_headers_dock, mHeadersFragment) 590 .replace(R.id.browse_container_dock, mRowsFragment).commit(); 591 } else { 592 mHeadersFragment = (HeadersFragment) getChildFragmentManager() 593 .findFragmentById(R.id.browse_headers_dock); 594 mRowsFragment = (RowsFragment) getChildFragmentManager() 595 .findFragmentById(R.id.browse_container_dock); 596 } 597 598 mHeadersFragment.setHeadersGone(!mCanShowHeaders); 599 600 mRowsFragment.setAdapter(mAdapter); 601 if (mHeaderPresenterSelector != null) { 602 mHeadersFragment.setPresenterSelector(mHeaderPresenterSelector); 603 } 604 mHeadersFragment.setAdapter(mAdapter); 605 606 mRowsFragment.enableRowScaling(mRowScaleEnabled); 607 mRowsFragment.setOnItemViewSelectedListener(mRowViewSelectedListener); 608 mHeadersFragment.setOnHeaderViewSelectedListener(mHeaderViewSelectedListener); 609 mHeadersFragment.setOnHeaderClickedListener(mHeaderClickedListener); 610 mRowsFragment.setOnItemViewClickedListener(mOnItemViewClickedListener); 611 612 View root = inflater.inflate(R.layout.lb_browse_fragment, container, false); 613 614 setTitleView((TitleView) root.findViewById(R.id.browse_title_group)); 615 616 mBrowseFrame = (BrowseFrameLayout) root.findViewById(R.id.browse_frame); 617 mBrowseFrame.setOnChildFocusListener(mOnChildFocusListener); 618 mBrowseFrame.setOnFocusSearchListener(mOnFocusSearchListener); 619 620 if (mBrandColorSet) { 621 mHeadersFragment.setBackgroundColor(mBrandColor); 622 } 623 624 mSceneWithHeaders = sTransitionHelper.createScene(mBrowseFrame, new Runnable() { 625 @Override 626 public void run() { 627 showHeaders(true); 628 } 629 }); 630 mSceneWithoutHeaders = sTransitionHelper.createScene(mBrowseFrame, new Runnable() { 631 @Override 632 public void run() { 633 showHeaders(false); 634 } 635 }); 636 mSceneAfterEntranceTransition = sTransitionHelper.createScene(mBrowseFrame, new Runnable() { 637 @Override 638 public void run() { 639 setEntranceTransitionEndState(); 640 } 641 }); 642 return root; 643 } 644 645 private void createHeadersTransition() { 646 mHeadersTransition = sTransitionHelper.loadTransition(getActivity(), 647 mShowingHeaders ? 648 R.transition.lb_browse_headers_in : R.transition.lb_browse_headers_out); 649 650 sTransitionHelper.setTransitionListener(mHeadersTransition, new TransitionListener() { 651 @Override 652 public void onTransitionStart(Object transition) { 653 } 654 @Override 655 public void onTransitionEnd(Object transition) { 656 mHeadersTransition = null; 657 mRowsFragment.onTransitionEnd(); 658 mHeadersFragment.onTransitionEnd(); 659 if (mShowingHeaders) { 660 VerticalGridView headerGridView = mHeadersFragment.getVerticalGridView(); 661 if (headerGridView != null && !headerGridView.hasFocus()) { 662 headerGridView.requestFocus(); 663 } 664 } else { 665 VerticalGridView rowsGridView = mRowsFragment.getVerticalGridView(); 666 if (rowsGridView != null && !rowsGridView.hasFocus()) { 667 rowsGridView.requestFocus(); 668 } 669 } 670 if (mBrowseTransitionListener != null) { 671 mBrowseTransitionListener.onHeadersTransitionStop(mShowingHeaders); 672 } 673 } 674 }); 675 } 676 677 /** 678 * Sets the {@link PresenterSelector} used to render the row headers. 679 * 680 * @param headerPresenterSelector The PresenterSelector that will determine 681 * the Presenter for each row header. 682 */ 683 public void setHeaderPresenterSelector(PresenterSelector headerPresenterSelector) { 684 mHeaderPresenterSelector = headerPresenterSelector; 685 if (mHeadersFragment != null) { 686 mHeadersFragment.setPresenterSelector(mHeaderPresenterSelector); 687 } 688 } 689 690 private void setRowsAlignedLeft(boolean alignLeft) { 691 MarginLayoutParams lp; 692 View containerList; 693 containerList = mRowsFragment.getView(); 694 lp = (MarginLayoutParams) containerList.getLayoutParams(); 695 lp.setMarginStart(alignLeft ? 0 : mContainerListMarginStart); 696 containerList.setLayoutParams(lp); 697 } 698 699 private void setHeadersOnScreen(boolean onScreen) { 700 MarginLayoutParams lp; 701 View containerList; 702 containerList = mHeadersFragment.getView(); 703 lp = (MarginLayoutParams) containerList.getLayoutParams(); 704 lp.setMarginStart(onScreen ? 0 : -mContainerListMarginStart); 705 containerList.setLayoutParams(lp); 706 } 707 708 private void showHeaders(boolean show) { 709 if (DEBUG) Log.v(TAG, "showHeaders " + show); 710 mHeadersFragment.setHeadersEnabled(show); 711 setHeadersOnScreen(show); 712 setRowsAlignedLeft(!show); 713 mRowsFragment.setExpand(!show); 714 } 715 716 private HeadersFragment.OnHeaderClickedListener mHeaderClickedListener = 717 new HeadersFragment.OnHeaderClickedListener() { 718 @Override 719 public void onHeaderClicked() { 720 if (!mCanShowHeaders || !mShowingHeaders || isInHeadersTransition()) { 721 return; 722 } 723 startHeadersTransitionInternal(false); 724 mRowsFragment.getVerticalGridView().requestFocus(); 725 } 726 }; 727 728 private OnItemViewSelectedListener mRowViewSelectedListener = new OnItemViewSelectedListener() { 729 @Override 730 public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item, 731 RowPresenter.ViewHolder rowViewHolder, Row row) { 732 int position = mRowsFragment.getVerticalGridView().getSelectedPosition(); 733 if (DEBUG) Log.v(TAG, "row selected position " + position); 734 onRowSelected(position); 735 if (mExternalOnItemViewSelectedListener != null) { 736 mExternalOnItemViewSelectedListener.onItemSelected(itemViewHolder, item, 737 rowViewHolder, row); 738 } 739 } 740 }; 741 742 private HeadersFragment.OnHeaderViewSelectedListener mHeaderViewSelectedListener = 743 new HeadersFragment.OnHeaderViewSelectedListener() { 744 @Override 745 public void onHeaderSelected(RowHeaderPresenter.ViewHolder viewHolder, Row row) { 746 int position = mHeadersFragment.getVerticalGridView().getSelectedPosition(); 747 if (DEBUG) Log.v(TAG, "header selected position " + position); 748 onRowSelected(position); 749 } 750 }; 751 752 private void onRowSelected(int position) { 753 if (position != mSelectedPosition) { 754 mSetSelectionRunnable.post( 755 position, SetSelectionRunnable.TYPE_INTERNAL_SYNC, true); 756 757 if (getAdapter() == null || getAdapter().size() == 0 || position == 0) { 758 showTitle(true); 759 } else { 760 showTitle(false); 761 } 762 } 763 } 764 765 private void setSelection(int position, boolean smooth) { 766 if (position != NO_POSITION) { 767 mRowsFragment.setSelectedPosition(position, smooth); 768 mHeadersFragment.setSelectedPosition(position, smooth); 769 } 770 mSelectedPosition = position; 771 } 772 773 /** 774 * Sets the selected row position with smooth animation. 775 */ 776 public void setSelectedPosition(int position) { 777 setSelectedPosition(position, true); 778 } 779 780 /** 781 * Sets the selected row position. 782 */ 783 public void setSelectedPosition(int position, boolean smooth) { 784 mSetSelectionRunnable.post( 785 position, SetSelectionRunnable.TYPE_USER_REQUEST, smooth); 786 } 787 788 @Override 789 public void onStart() { 790 super.onStart(); 791 mHeadersFragment.setWindowAlignmentFromTop(mContainerListAlignTop); 792 mHeadersFragment.setItemAlignment(); 793 mRowsFragment.setWindowAlignmentFromTop(mContainerListAlignTop); 794 mRowsFragment.setItemAlignment(); 795 796 mRowsFragment.setScalePivots(0, mContainerListAlignTop); 797 798 if (mCanShowHeaders && mShowingHeaders && mHeadersFragment.getView() != null) { 799 mHeadersFragment.getView().requestFocus(); 800 } else if ((!mCanShowHeaders || !mShowingHeaders) 801 && mRowsFragment.getView() != null) { 802 mRowsFragment.getView().requestFocus(); 803 } 804 if (mCanShowHeaders) { 805 showHeaders(mShowingHeaders); 806 } 807 if (isEntranceTransitionEnabled()) { 808 setEntranceTransitionStartState(); 809 } 810 } 811 812 /** 813 * Enables/disables headers transition on back key support. This is enabled by 814 * default. The BrowseFragment will add a back stack entry when headers are 815 * showing. Running a headers transition when the back key is pressed only 816 * works when the headers state is {@link #HEADERS_ENABLED} or 817 * {@link #HEADERS_HIDDEN}. 818 * <p> 819 * NOTE: If an Activity has its own onBackPressed() handling, you must 820 * disable this feature. You may use {@link #startHeadersTransition(boolean)} 821 * and {@link BrowseTransitionListener} in your own back stack handling. 822 */ 823 public final void setHeadersTransitionOnBackEnabled(boolean headersBackStackEnabled) { 824 mHeadersBackStackEnabled = headersBackStackEnabled; 825 } 826 827 /** 828 * Returns true if headers transition on back key support is enabled. 829 */ 830 public final boolean isHeadersTransitionOnBackEnabled() { 831 return mHeadersBackStackEnabled; 832 } 833 834 private void readArguments(Bundle args) { 835 if (args == null) { 836 return; 837 } 838 if (args.containsKey(ARG_TITLE)) { 839 setTitle(args.getString(ARG_TITLE)); 840 } 841 if (args.containsKey(ARG_HEADERS_STATE)) { 842 setHeadersState(args.getInt(ARG_HEADERS_STATE)); 843 } 844 } 845 846 /** 847 * Sets the state for the headers column in the browse fragment. Must be one 848 * of {@link #HEADERS_ENABLED}, {@link #HEADERS_HIDDEN}, or 849 * {@link #HEADERS_DISABLED}. 850 * 851 * @param headersState The state of the headers for the browse fragment. 852 */ 853 public void setHeadersState(int headersState) { 854 if (headersState < HEADERS_ENABLED || headersState > HEADERS_DISABLED) { 855 throw new IllegalArgumentException("Invalid headers state: " + headersState); 856 } 857 if (DEBUG) Log.v(TAG, "setHeadersState " + headersState); 858 859 if (headersState != mHeadersState) { 860 mHeadersState = headersState; 861 switch (headersState) { 862 case HEADERS_ENABLED: 863 mCanShowHeaders = true; 864 mShowingHeaders = true; 865 break; 866 case HEADERS_HIDDEN: 867 mCanShowHeaders = true; 868 mShowingHeaders = false; 869 break; 870 case HEADERS_DISABLED: 871 mCanShowHeaders = false; 872 mShowingHeaders = false; 873 break; 874 default: 875 Log.w(TAG, "Unknown headers state: " + headersState); 876 break; 877 } 878 if (mHeadersFragment != null) { 879 mHeadersFragment.setHeadersGone(!mCanShowHeaders); 880 } 881 } 882 } 883 884 /** 885 * Returns the state of the headers column in the browse fragment. 886 */ 887 public int getHeadersState() { 888 return mHeadersState; 889 } 890 891 @Override 892 protected Object createEntranceTransition() { 893 return sTransitionHelper.loadTransition(getActivity(), 894 R.transition.lb_browse_entrance_transition); 895 } 896 897 @Override 898 protected void runEntranceTransition(Object entranceTransition) { 899 sTransitionHelper.runTransition(mSceneAfterEntranceTransition, 900 entranceTransition); 901 } 902 903 @Override 904 protected void onEntranceTransitionStart() { 905 mHeadersFragment.onTransitionStart(); 906 mRowsFragment.onTransitionStart(); 907 } 908 909 @Override 910 protected void onEntranceTransitionEnd() { 911 mRowsFragment.onTransitionEnd(); 912 mHeadersFragment.onTransitionEnd(); 913 } 914 915 void setSearchOrbViewOnScreen(boolean onScreen) { 916 View searchOrbView = getTitleView().getSearchAffordanceView(); 917 MarginLayoutParams lp = (MarginLayoutParams) searchOrbView.getLayoutParams(); 918 lp.setMarginStart(onScreen ? 0 : -mContainerListMarginStart); 919 searchOrbView.setLayoutParams(lp); 920 } 921 922 void setEntranceTransitionStartState() { 923 setHeadersOnScreen(false); 924 setSearchOrbViewOnScreen(false); 925 mRowsFragment.setEntranceTransitionState(false); 926 } 927 928 void setEntranceTransitionEndState() { 929 setHeadersOnScreen(mShowingHeaders); 930 setSearchOrbViewOnScreen(true); 931 mRowsFragment.setEntranceTransitionState(true); 932 } 933 934} 935 936