GridLayoutManager.java revision 9a8833a689869ecdacfcc280b5cffb133ccf9f76
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.content.Context; 17import android.graphics.PointF; 18import android.graphics.Rect; 19import android.os.Bundle; 20import android.os.Parcel; 21import android.os.Parcelable; 22import android.support.v4.util.CircularIntArray; 23import android.support.v4.view.ViewCompat; 24import android.support.v4.view.accessibility.AccessibilityEventCompat; 25import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; 26import android.support.v4.view.accessibility.AccessibilityRecordCompat; 27import android.support.v7.widget.LinearSmoothScroller; 28import android.support.v7.widget.RecyclerView; 29import android.support.v7.widget.RecyclerView.Recycler; 30import android.support.v7.widget.RecyclerView.State; 31import android.support.v17.leanback.os.TraceHelper; 32 33import static android.support.v7.widget.RecyclerView.NO_ID; 34import static android.support.v7.widget.RecyclerView.NO_POSITION; 35import static android.support.v7.widget.RecyclerView.HORIZONTAL; 36import static android.support.v7.widget.RecyclerView.VERTICAL; 37 38import android.util.AttributeSet; 39import android.util.Log; 40import android.view.FocusFinder; 41import android.view.Gravity; 42import android.view.View; 43import android.view.ViewParent; 44import android.view.View.MeasureSpec; 45import android.view.ViewGroup.MarginLayoutParams; 46import android.view.ViewGroup; 47 48import java.io.PrintWriter; 49import java.io.StringWriter; 50import java.util.ArrayList; 51import java.util.List; 52 53final class GridLayoutManager extends RecyclerView.LayoutManager { 54 55 /* 56 * LayoutParams for {@link HorizontalGridView} and {@link VerticalGridView}. 57 * The class currently does two internal jobs: 58 * - Saves optical bounds insets. 59 * - Caches focus align view center. 60 */ 61 final static class LayoutParams extends RecyclerView.LayoutParams { 62 63 // For placement 64 private int mLeftInset; 65 private int mTopInset; 66 private int mRightInset; 67 private int mBottomInset; 68 69 // For alignment 70 private int mAlignX; 71 private int mAlignY; 72 private int[] mAlignMultiple; 73 private ItemAlignmentFacet mAlignmentFacet; 74 75 public LayoutParams(Context c, AttributeSet attrs) { 76 super(c, attrs); 77 } 78 79 public LayoutParams(int width, int height) { 80 super(width, height); 81 } 82 83 public LayoutParams(MarginLayoutParams source) { 84 super(source); 85 } 86 87 public LayoutParams(ViewGroup.LayoutParams source) { 88 super(source); 89 } 90 91 public LayoutParams(RecyclerView.LayoutParams source) { 92 super(source); 93 } 94 95 public LayoutParams(LayoutParams source) { 96 super(source); 97 } 98 99 int getAlignX() { 100 return mAlignX; 101 } 102 103 int getAlignY() { 104 return mAlignY; 105 } 106 107 int getOpticalLeft(View view) { 108 return view.getLeft() + mLeftInset; 109 } 110 111 int getOpticalTop(View view) { 112 return view.getTop() + mTopInset; 113 } 114 115 int getOpticalRight(View view) { 116 return view.getRight() - mRightInset; 117 } 118 119 int getOpticalBottom(View view) { 120 return view.getBottom() - mBottomInset; 121 } 122 123 int getOpticalWidth(View view) { 124 return view.getWidth() - mLeftInset - mRightInset; 125 } 126 127 int getOpticalHeight(View view) { 128 return view.getHeight() - mTopInset - mBottomInset; 129 } 130 131 int getDecoratedOpticalLeftWithMargin(RecyclerView.LayoutManager lm, View view) { 132 return lm.getDecoratedLeft(view) + mLeftInset - leftMargin; 133 } 134 135 int getDecoratedOpticalTopWithMargin(RecyclerView.LayoutManager lm, View view) { 136 return lm.getDecoratedTop(view) + mTopInset - topMargin; 137 } 138 139 int getDecoratedOpticalRightWithMargin(RecyclerView.LayoutManager lm, View view) { 140 return lm.getDecoratedRight(view) - mRightInset + rightMargin; 141 } 142 143 int getDecoratedOpticalBottomWithMargin(RecyclerView.LayoutManager lm, View view) { 144 return lm.getDecoratedBottom(view) - mBottomInset + bottomMargin; 145 } 146 147 int getDecoratedOpticalWidthWithMargin(RecyclerView.LayoutManager lm, View view) { 148 return lm.getDecoratedRight(view) - lm.getDecoratedLeft(view) 149 - mLeftInset - mRightInset + leftMargin + rightMargin; 150 } 151 152 int getDecoratedOpticalHeightWithMargin(RecyclerView.LayoutManager lm, View view) { 153 return lm.getDecoratedBottom(view) - lm.getDecoratedTop(view) 154 - mTopInset - mBottomInset + topMargin + bottomMargin; 155 } 156 157 int getOpticalLeftInset() { 158 return mLeftInset; 159 } 160 161 int getOpticalRightInset() { 162 return mRightInset; 163 } 164 165 int getOpticalTopInset() { 166 return mTopInset; 167 } 168 169 int getOpticalBottomInset() { 170 return mBottomInset; 171 } 172 173 void setAlignX(int alignX) { 174 mAlignX = alignX; 175 } 176 177 void setAlignY(int alignY) { 178 mAlignY = alignY; 179 } 180 181 void setItemAlignmentFacet(ItemAlignmentFacet facet) { 182 mAlignmentFacet = facet; 183 } 184 185 ItemAlignmentFacet getItemAlignmentFacet() { 186 return mAlignmentFacet; 187 } 188 189 void calculateItemAlignments(int orientation, View view) { 190 ItemAlignmentFacet.ItemAlignmentDef[] defs = mAlignmentFacet.getAlignmentDefs(); 191 if (mAlignMultiple == null || mAlignMultiple.length != defs.length) { 192 mAlignMultiple = new int[defs.length]; 193 } 194 for (int i = 0; i < defs.length; i++) { 195 mAlignMultiple[i] = ItemAlignmentFacetHelper 196 .getAlignmentPosition(view, defs[i], orientation); 197 } 198 if (orientation == HORIZONTAL) { 199 mAlignX = mAlignMultiple[0]; 200 } else { 201 mAlignY = mAlignMultiple[0]; 202 } 203 } 204 205 int[] getAlignMultiple() { 206 return mAlignMultiple; 207 } 208 209 void setOpticalInsets(int leftInset, int topInset, int rightInset, int bottomInset) { 210 mLeftInset = leftInset; 211 mTopInset = topInset; 212 mRightInset = rightInset; 213 mBottomInset = bottomInset; 214 } 215 216 } 217 218 /** 219 * Base class which scrolls to selected view in onStop(). 220 */ 221 abstract class GridLinearSmoothScroller extends LinearSmoothScroller { 222 GridLinearSmoothScroller() { 223 super(mBaseGridView.getContext()); 224 } 225 226 @Override 227 protected void onStop() { 228 // onTargetFound() may not be called if we hit the "wall" first or get cancelled. 229 View targetView = findViewByPosition(getTargetPosition()); 230 if (targetView == null) { 231 if (getTargetPosition() >= 0) { 232 // if smooth scroller is stopped without target, immediately jumps 233 // to the target position. 234 scrollToSelection(mBaseGridView, getTargetPosition(), 0, false, 0); 235 } 236 super.onStop(); 237 return; 238 } 239 if (hasFocus()) { 240 mInSelection = true; 241 targetView.requestFocus(); 242 mInSelection = false; 243 } 244 dispatchChildSelected(); 245 super.onStop(); 246 } 247 248 @Override 249 protected void onTargetFound(View targetView, 250 RecyclerView.State state, Action action) { 251 if (getScrollPosition(targetView, null, sTwoInts)) { 252 int dx, dy; 253 if (mOrientation == HORIZONTAL) { 254 dx = sTwoInts[0]; 255 dy = sTwoInts[1]; 256 } else { 257 dx = sTwoInts[1]; 258 dy = sTwoInts[0]; 259 } 260 final int distance = (int) Math.sqrt(dx * dx + dy * dy); 261 final int time = calculateTimeForDeceleration(distance); 262 action.update(dx, dy, time, mDecelerateInterpolator); 263 } 264 } 265 } 266 267 /** 268 * The SmoothScroller that remembers pending DPAD keys and consume pending keys 269 * during scroll. 270 */ 271 final class PendingMoveSmoothScroller extends GridLinearSmoothScroller { 272 // -2 is a target position that LinearSmoothScroller can never find until 273 // consumePendingMovesXXX() sets real targetPosition. 274 final static int TARGET_UNDEFINED = -2; 275 // whether the grid is staggered. 276 private final boolean mStaggeredGrid; 277 // Number of pending movements on primary direction, negative if PREV_ITEM. 278 private int mPendingMoves; 279 280 PendingMoveSmoothScroller(int initialPendingMoves, boolean staggeredGrid) { 281 mPendingMoves = initialPendingMoves; 282 mStaggeredGrid = staggeredGrid; 283 setTargetPosition(TARGET_UNDEFINED); 284 } 285 286 void increasePendingMoves() { 287 if (mPendingMoves < MAX_PENDING_MOVES) { 288 mPendingMoves++; 289 } 290 } 291 292 void decreasePendingMoves() { 293 if (mPendingMoves > -MAX_PENDING_MOVES) { 294 mPendingMoves--; 295 } 296 } 297 298 /** 299 * Called before laid out an item when non-staggered grid can handle pending movements 300 * by skipping "mNumRows" per movement; staggered grid will have to wait the item 301 * has been laid out in consumePendingMovesAfterLayout(). 302 */ 303 void consumePendingMovesBeforeLayout() { 304 if (mStaggeredGrid || mPendingMoves == 0) { 305 return; 306 } 307 View newSelected = null; 308 int startPos = mPendingMoves > 0 ? mFocusPosition + mNumRows : 309 mFocusPosition - mNumRows; 310 for (int pos = startPos; mPendingMoves != 0; 311 pos = mPendingMoves > 0 ? pos + mNumRows: pos - mNumRows) { 312 View v = findViewByPosition(pos); 313 if (v == null) { 314 break; 315 } 316 if (!canScrollTo(v)) { 317 continue; 318 } 319 newSelected = v; 320 mFocusPosition = pos; 321 mSubFocusPosition = 0; 322 if (mPendingMoves > 0) { 323 mPendingMoves--; 324 } else { 325 mPendingMoves++; 326 } 327 } 328 if (newSelected != null && hasFocus()) { 329 mInSelection = true; 330 newSelected.requestFocus(); 331 mInSelection = false; 332 } 333 } 334 335 /** 336 * Called after laid out an item. Staggered grid should find view on same 337 * Row and consume pending movements. 338 */ 339 void consumePendingMovesAfterLayout() { 340 if (mStaggeredGrid && mPendingMoves != 0) { 341 // consume pending moves, focus to item on the same row. 342 mPendingMoves = processSelectionMoves(true, mPendingMoves); 343 } 344 if (mPendingMoves == 0 || (mPendingMoves > 0 && hasCreatedLastItem()) 345 || (mPendingMoves < 0 && hasCreatedFirstItem())) { 346 setTargetPosition(mFocusPosition); 347 stop(); 348 } 349 } 350 351 @Override 352 protected void updateActionForInterimTarget(Action action) { 353 if (mPendingMoves == 0) { 354 return; 355 } 356 super.updateActionForInterimTarget(action); 357 } 358 359 @Override 360 public PointF computeScrollVectorForPosition(int targetPosition) { 361 if (mPendingMoves == 0) { 362 return null; 363 } 364 int direction = (mReverseFlowPrimary ? mPendingMoves > 0 : mPendingMoves < 0) ? 365 -1 : 1; 366 if (mOrientation == HORIZONTAL) { 367 return new PointF(direction, 0); 368 } else { 369 return new PointF(0, direction); 370 } 371 } 372 373 @Override 374 protected void onStop() { 375 super.onStop(); 376 // if we hit wall, need clear the remaining pending moves. 377 mPendingMoves = 0; 378 mPendingMoveSmoothScroller = null; 379 View v = findViewByPosition(getTargetPosition()); 380 if (v != null) scrollToView(v, true); 381 } 382 }; 383 384 private static final String TAG = "GridLayoutManager"; 385 private static final boolean DEBUG = false; 386 private static final boolean TRACE = false; 387 388 // maximum pending movement in one direction. 389 private final static int MAX_PENDING_MOVES = 10; 390 391 private String getTag() { 392 return TAG + ":" + mBaseGridView.getId(); 393 } 394 395 private final BaseGridView mBaseGridView; 396 397 /** 398 * Note on conventions in the presence of RTL layout directions: 399 * Many properties and method names reference entities related to the 400 * beginnings and ends of things. In the presence of RTL flows, 401 * it may not be clear whether this is intended to reference a 402 * quantity that changes direction in RTL cases, or a quantity that 403 * does not. Here are the conventions in use: 404 * 405 * start/end: coordinate quantities - do reverse 406 * (optical) left/right: coordinate quantities - do not reverse 407 * low/high: coordinate quantities - do not reverse 408 * min/max: coordinate quantities - do not reverse 409 * scroll offset - coordinate quantities - do not reverse 410 * first/last: positional indices - do not reverse 411 * front/end: positional indices - do not reverse 412 * prepend/append: related to positional indices - do not reverse 413 * 414 * Note that although quantities do not reverse in RTL flows, their 415 * relationship does. In LTR flows, the first positional index is 416 * leftmost; in RTL flows, it is rightmost. Thus, anywhere that 417 * positional quantities are mapped onto coordinate quantities, 418 * the flow must be checked and the logic reversed. 419 */ 420 421 /** 422 * The orientation of a "row". 423 */ 424 private int mOrientation = HORIZONTAL; 425 426 private RecyclerView.State mState; 427 private RecyclerView.Recycler mRecycler; 428 429 private static final Rect sTempRect = new Rect(); 430 431 private boolean mInLayout; 432 private boolean mInScroll; 433 private boolean mInFastRelayout; 434 /** 435 * During full layout pass, when GridView had focus: onLayoutChildren will 436 * skip non-focusable child and adjust mFocusPosition. 437 */ 438 private boolean mInLayoutSearchFocus; 439 private boolean mInSelection = false; 440 441 private OnChildSelectedListener mChildSelectedListener = null; 442 443 private OnChildViewHolderSelectedListener mChildViewHolderSelectedListener = null; 444 445 private OnChildLaidOutListener mChildLaidOutListener = null; 446 447 /** 448 * The focused position, it's not the currently visually aligned position 449 * but it is the final position that we intend to focus on. If there are 450 * multiple setSelection() called, mFocusPosition saves last value. 451 */ 452 private int mFocusPosition = NO_POSITION; 453 454 /** 455 * A view can have mutliple alignment position, this is the index of which 456 * alignment is used, by default is 0. 457 */ 458 private int mSubFocusPosition = 0; 459 460 /** 461 * LinearSmoothScroller that consume pending DPAD movements. 462 */ 463 private PendingMoveSmoothScroller mPendingMoveSmoothScroller; 464 465 /** 466 * The offset to be applied to mFocusPosition, due to adapter change, on the next 467 * layout. Set to Integer.MIN_VALUE means we should stop adding delta to mFocusPosition 468 * until next layout cycler. 469 * TODO: This is somewhat duplication of RecyclerView getOldPosition() which is 470 * unfortunately cleared after prelayout. 471 */ 472 private int mFocusPositionOffset = 0; 473 474 /** 475 * Extra pixels applied on primary direction. 476 */ 477 private int mPrimaryScrollExtra; 478 479 /** 480 * Force a full layout under certain situations. E.g. Rows change, jump to invisible child. 481 */ 482 private boolean mForceFullLayout; 483 484 /** 485 * True if layout is enabled. 486 */ 487 private boolean mLayoutEnabled = true; 488 489 /** 490 * override child visibility 491 */ 492 private int mChildVisibility = -1; 493 494 /** 495 * The scroll offsets of the viewport relative to the entire view. 496 */ 497 private int mScrollOffsetPrimary; 498 private int mScrollOffsetSecondary; 499 500 /** 501 * User-specified row height/column width. Can be WRAP_CONTENT. 502 */ 503 private int mRowSizeSecondaryRequested; 504 505 /** 506 * The fixed size of each grid item in the secondary direction. This corresponds to 507 * the row height, equal for all rows. Grid items may have variable length 508 * in the primary direction. 509 */ 510 private int mFixedRowSizeSecondary; 511 512 /** 513 * Tracks the secondary size of each row. 514 */ 515 private int[] mRowSizeSecondary; 516 517 /** 518 * Flag controlling whether the current/next layout should 519 * be updating the secondary size of rows. 520 */ 521 private boolean mRowSecondarySizeRefresh; 522 523 /** 524 * The maximum measured size of the view. 525 */ 526 private int mMaxSizeSecondary; 527 528 /** 529 * Margin between items. 530 */ 531 private int mHorizontalMargin; 532 /** 533 * Margin between items vertically. 534 */ 535 private int mVerticalMargin; 536 /** 537 * Margin in main direction. 538 */ 539 private int mMarginPrimary; 540 /** 541 * Margin in second direction. 542 */ 543 private int mMarginSecondary; 544 /** 545 * How to position child in secondary direction. 546 */ 547 private int mGravity = Gravity.START | Gravity.TOP; 548 /** 549 * The number of rows in the grid. 550 */ 551 private int mNumRows; 552 /** 553 * Number of rows requested, can be 0 to be determined by parent size and 554 * rowHeight. 555 */ 556 private int mNumRowsRequested = 1; 557 558 /** 559 * Saves grid information of each view. 560 */ 561 Grid mGrid; 562 563 /** 564 * Focus Scroll strategy. 565 */ 566 private int mFocusScrollStrategy = BaseGridView.FOCUS_SCROLL_ALIGNED; 567 /** 568 * Defines how item view is aligned in the window. 569 */ 570 private final WindowAlignment mWindowAlignment = new WindowAlignment(); 571 572 /** 573 * Defines how item view is aligned. 574 */ 575 private final ItemAlignment mItemAlignment = new ItemAlignment(); 576 577 /** 578 * Dimensions of the view, width or height depending on orientation. 579 */ 580 private int mSizePrimary; 581 582 /** 583 * Pixels of extra space for layout item (outside the widget) 584 */ 585 private int mExtraLayoutSpace; 586 587 /** 588 * Allow DPAD key to navigate out at the front of the View (where position = 0), 589 * default is false. 590 */ 591 private boolean mFocusOutFront; 592 593 /** 594 * Allow DPAD key to navigate out at the end of the view, default is false. 595 */ 596 private boolean mFocusOutEnd; 597 598 /** 599 * True if focus search is disabled. 600 */ 601 private boolean mFocusSearchDisabled; 602 603 /** 604 * True if prune child, might be disabled during transition. 605 */ 606 private boolean mPruneChild = true; 607 608 /** 609 * True if scroll content, might be disabled during transition. 610 */ 611 private boolean mScrollEnabled = true; 612 613 /** 614 * Temporary variable: an int array of length=2. 615 */ 616 private static int[] sTwoInts = new int[2]; 617 618 /** 619 * Set to true for RTL layout in horizontal orientation 620 */ 621 private boolean mReverseFlowPrimary = false; 622 623 /** 624 * Set to true for RTL layout in vertical orientation 625 */ 626 private boolean mReverseFlowSecondary = false; 627 628 /** 629 * Temporaries used for measuring. 630 */ 631 private int[] mMeasuredDimension = new int[2]; 632 633 final ViewsStateBundle mChildrenStates = new ViewsStateBundle(); 634 635 /** 636 * Optional interface implemented by Adapter. 637 */ 638 private FacetProviderAdapter mFacetProviderAdapter; 639 640 public GridLayoutManager(BaseGridView baseGridView) { 641 mBaseGridView = baseGridView; 642 } 643 644 public void setOrientation(int orientation) { 645 if (orientation != HORIZONTAL && orientation != VERTICAL) { 646 if (DEBUG) Log.v(getTag(), "invalid orientation: " + orientation); 647 return; 648 } 649 650 mOrientation = orientation; 651 mWindowAlignment.setOrientation(orientation); 652 mItemAlignment.setOrientation(orientation); 653 mForceFullLayout = true; 654 } 655 656 public void onRtlPropertiesChanged(int layoutDirection) { 657 if (mOrientation == HORIZONTAL) { 658 mReverseFlowPrimary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 659 mReverseFlowSecondary = false; 660 } else { 661 mReverseFlowSecondary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 662 mReverseFlowPrimary = false; 663 } 664 mWindowAlignment.horizontal.setReversedFlow(layoutDirection == View.LAYOUT_DIRECTION_RTL); 665 } 666 667 public int getFocusScrollStrategy() { 668 return mFocusScrollStrategy; 669 } 670 671 public void setFocusScrollStrategy(int focusScrollStrategy) { 672 mFocusScrollStrategy = focusScrollStrategy; 673 } 674 675 public void setWindowAlignment(int windowAlignment) { 676 mWindowAlignment.mainAxis().setWindowAlignment(windowAlignment); 677 } 678 679 public int getWindowAlignment() { 680 return mWindowAlignment.mainAxis().getWindowAlignment(); 681 } 682 683 public void setWindowAlignmentOffset(int alignmentOffset) { 684 mWindowAlignment.mainAxis().setWindowAlignmentOffset(alignmentOffset); 685 } 686 687 public int getWindowAlignmentOffset() { 688 return mWindowAlignment.mainAxis().getWindowAlignmentOffset(); 689 } 690 691 public void setWindowAlignmentOffsetPercent(float offsetPercent) { 692 mWindowAlignment.mainAxis().setWindowAlignmentOffsetPercent(offsetPercent); 693 } 694 695 public float getWindowAlignmentOffsetPercent() { 696 return mWindowAlignment.mainAxis().getWindowAlignmentOffsetPercent(); 697 } 698 699 public void setItemAlignmentOffset(int alignmentOffset) { 700 mItemAlignment.mainAxis().setItemAlignmentOffset(alignmentOffset); 701 updateChildAlignments(); 702 } 703 704 public int getItemAlignmentOffset() { 705 return mItemAlignment.mainAxis().getItemAlignmentOffset(); 706 } 707 708 public void setItemAlignmentOffsetWithPadding(boolean withPadding) { 709 mItemAlignment.mainAxis().setItemAlignmentOffsetWithPadding(withPadding); 710 updateChildAlignments(); 711 } 712 713 public boolean isItemAlignmentOffsetWithPadding() { 714 return mItemAlignment.mainAxis().isItemAlignmentOffsetWithPadding(); 715 } 716 717 public void setItemAlignmentOffsetPercent(float offsetPercent) { 718 mItemAlignment.mainAxis().setItemAlignmentOffsetPercent(offsetPercent); 719 updateChildAlignments(); 720 } 721 722 public float getItemAlignmentOffsetPercent() { 723 return mItemAlignment.mainAxis().getItemAlignmentOffsetPercent(); 724 } 725 726 public void setItemAlignmentViewId(int viewId) { 727 mItemAlignment.mainAxis().setItemAlignmentViewId(viewId); 728 updateChildAlignments(); 729 } 730 731 public int getItemAlignmentViewId() { 732 return mItemAlignment.mainAxis().getItemAlignmentViewId(); 733 } 734 735 public void setFocusOutAllowed(boolean throughFront, boolean throughEnd) { 736 mFocusOutFront = throughFront; 737 mFocusOutEnd = throughEnd; 738 } 739 740 public void setNumRows(int numRows) { 741 if (numRows < 0) throw new IllegalArgumentException(); 742 mNumRowsRequested = numRows; 743 } 744 745 /** 746 * Set the row height. May be WRAP_CONTENT, or a size in pixels. 747 */ 748 public void setRowHeight(int height) { 749 if (height >= 0 || height == ViewGroup.LayoutParams.WRAP_CONTENT) { 750 mRowSizeSecondaryRequested = height; 751 } else { 752 throw new IllegalArgumentException("Invalid row height: " + height); 753 } 754 } 755 756 public void setItemMargin(int margin) { 757 mVerticalMargin = mHorizontalMargin = margin; 758 mMarginPrimary = mMarginSecondary = margin; 759 } 760 761 public void setVerticalMargin(int margin) { 762 if (mOrientation == HORIZONTAL) { 763 mMarginSecondary = mVerticalMargin = margin; 764 } else { 765 mMarginPrimary = mVerticalMargin = margin; 766 } 767 } 768 769 public void setHorizontalMargin(int margin) { 770 if (mOrientation == HORIZONTAL) { 771 mMarginPrimary = mHorizontalMargin = margin; 772 } else { 773 mMarginSecondary = mHorizontalMargin = margin; 774 } 775 } 776 777 public int getVerticalMargin() { 778 return mVerticalMargin; 779 } 780 781 public int getHorizontalMargin() { 782 return mHorizontalMargin; 783 } 784 785 public void setGravity(int gravity) { 786 mGravity = gravity; 787 } 788 789 protected boolean hasDoneFirstLayout() { 790 return mGrid != null; 791 } 792 793 public void setOnChildSelectedListener(OnChildSelectedListener listener) { 794 mChildSelectedListener = listener; 795 } 796 797 public void setOnChildViewHolderSelectedListener(OnChildViewHolderSelectedListener listener) { 798 mChildViewHolderSelectedListener = listener; 799 } 800 801 void setOnChildLaidOutListener(OnChildLaidOutListener listener) { 802 mChildLaidOutListener = listener; 803 } 804 805 private int getPositionByView(View view) { 806 if (view == null) { 807 return NO_POSITION; 808 } 809 LayoutParams params = (LayoutParams) view.getLayoutParams(); 810 if (params == null || params.isItemRemoved()) { 811 // when item is removed, the position value can be any value. 812 return NO_POSITION; 813 } 814 return params.getViewPosition(); 815 } 816 817 private int getSubPositionByView(View view, View childView) { 818 if (view == null || childView == null) { 819 return 0; 820 } 821 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 822 final ItemAlignmentFacet facet = lp.getItemAlignmentFacet(); 823 if (facet != null) { 824 final ItemAlignmentFacet.ItemAlignmentDef[] defs = facet.getAlignmentDefs(); 825 if (defs.length > 1) { 826 while (childView != view) { 827 int id = childView.getId(); 828 if (id != View.NO_ID) { 829 for (int i = 1; i < defs.length; i++) { 830 if (defs[i].getItemAlignmentFocusViewId() == id) { 831 return i; 832 } 833 } 834 } 835 childView = (View) childView.getParent(); 836 } 837 } 838 } 839 return 0; 840 } 841 842 private int getPositionByIndex(int index) { 843 return getPositionByView(getChildAt(index)); 844 } 845 846 private void dispatchChildSelected() { 847 if (mChildSelectedListener == null && mChildViewHolderSelectedListener == null) { 848 return; 849 } 850 851 if (TRACE) TraceHelper.beginSection("onChildSelected"); 852 View view = mFocusPosition == NO_POSITION ? null : findViewByPosition(mFocusPosition); 853 if (view != null) { 854 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(view); 855 if (mChildSelectedListener != null) { 856 mChildSelectedListener.onChildSelected(mBaseGridView, view, mFocusPosition, 857 vh == null? NO_ID: vh.getItemId()); 858 } 859 if (mChildViewHolderSelectedListener != null) { 860 mChildViewHolderSelectedListener.onChildViewHolderSelected(mBaseGridView, vh, 861 mFocusPosition, mSubFocusPosition); 862 } 863 } else { 864 if (mChildSelectedListener != null) { 865 mChildSelectedListener.onChildSelected(mBaseGridView, null, NO_POSITION, NO_ID); 866 } 867 if (mChildViewHolderSelectedListener != null) { 868 mChildViewHolderSelectedListener.onChildViewHolderSelected(mBaseGridView, null, 869 NO_POSITION, 0); 870 } 871 } 872 if (TRACE) TraceHelper.endSection(); 873 874 // Children may request layout when a child selection event occurs (such as a change of 875 // padding on the current and previously selected rows). 876 // If in layout, a child requesting layout may have been laid out before the selection 877 // callback. 878 // If it was not, the child will be laid out after the selection callback. 879 // If so, the layout request will be honoured though the view system will emit a double- 880 // layout warning. 881 // If not in layout, we may be scrolling in which case the child layout request will be 882 // eaten by recyclerview. Post a requestLayout. 883 if (!mInLayout && !mBaseGridView.isLayoutRequested()) { 884 int childCount = getChildCount(); 885 for (int i = 0; i < childCount; i++) { 886 if (getChildAt(i).isLayoutRequested()) { 887 forceRequestLayout(); 888 break; 889 } 890 } 891 } 892 } 893 894 @Override 895 public boolean canScrollHorizontally() { 896 // We can scroll horizontally if we have horizontal orientation, or if 897 // we are vertical and have more than one column. 898 return mOrientation == HORIZONTAL || mNumRows > 1; 899 } 900 901 @Override 902 public boolean canScrollVertically() { 903 // We can scroll vertically if we have vertical orientation, or if we 904 // are horizontal and have more than one row. 905 return mOrientation == VERTICAL || mNumRows > 1; 906 } 907 908 @Override 909 public RecyclerView.LayoutParams generateDefaultLayoutParams() { 910 return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 911 ViewGroup.LayoutParams.WRAP_CONTENT); 912 } 913 914 @Override 915 public RecyclerView.LayoutParams generateLayoutParams(Context context, AttributeSet attrs) { 916 return new LayoutParams(context, attrs); 917 } 918 919 @Override 920 public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { 921 if (lp instanceof LayoutParams) { 922 return new LayoutParams((LayoutParams) lp); 923 } else if (lp instanceof RecyclerView.LayoutParams) { 924 return new LayoutParams((RecyclerView.LayoutParams) lp); 925 } else if (lp instanceof MarginLayoutParams) { 926 return new LayoutParams((MarginLayoutParams) lp); 927 } else { 928 return new LayoutParams(lp); 929 } 930 } 931 932 protected View getViewForPosition(int position) { 933 return mRecycler.getViewForPosition(position); 934 } 935 936 final int getOpticalLeft(View v) { 937 return ((LayoutParams) v.getLayoutParams()).getOpticalLeft(v); 938 } 939 940 final int getOpticalRight(View v) { 941 return ((LayoutParams) v.getLayoutParams()).getOpticalRight(v); 942 } 943 944 final int getOpticalTop(View v) { 945 return ((LayoutParams) v.getLayoutParams()).getOpticalTop(v); 946 } 947 948 final int getOpticalBottom(View v) { 949 return ((LayoutParams) v.getLayoutParams()).getOpticalBottom(v); 950 } 951 952 private int getViewMin(View v) { 953 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 954 return (mOrientation == HORIZONTAL) ? lp.getDecoratedOpticalLeftWithMargin(this, v) 955 : lp.getDecoratedOpticalTopWithMargin(this, v); 956 } 957 958 private int getViewMax(View v) { 959 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 960 return (mOrientation == HORIZONTAL) ? lp.getDecoratedOpticalRightWithMargin(this, v) 961 : lp.getDecoratedOpticalBottomWithMargin(this, v); 962 } 963 964 private int getViewPrimarySize(View view) { 965 LayoutParams p = (LayoutParams) view.getLayoutParams(); 966 return mOrientation == HORIZONTAL ? p.getDecoratedOpticalWidthWithMargin(this, view) 967 : p.getDecoratedOpticalHeightWithMargin(this, view); 968 } 969 970 private int getViewCenter(View view) { 971 return (mOrientation == HORIZONTAL) ? getViewCenterX(view) : getViewCenterY(view); 972 } 973 974 private int getViewCenterSecondary(View view) { 975 return (mOrientation == HORIZONTAL) ? getViewCenterY(view) : getViewCenterX(view); 976 } 977 978 private int getViewCenterX(View v) { 979 LayoutParams p = (LayoutParams) v.getLayoutParams(); 980 return p.getOpticalLeft(v) + p.getAlignX(); 981 } 982 983 private int getViewCenterY(View v) { 984 LayoutParams p = (LayoutParams) v.getLayoutParams(); 985 return p.getOpticalTop(v) + p.getAlignY(); 986 } 987 988 /** 989 * Save Recycler and State for convenience. Must be paired with leaveContext(). 990 */ 991 private void saveContext(Recycler recycler, State state) { 992 if (mRecycler != null || mState != null) { 993 Log.e(TAG, "Recycler information was not released, bug!"); 994 } 995 mRecycler = recycler; 996 mState = state; 997 } 998 999 /** 1000 * Discard saved Recycler and State. 1001 */ 1002 private void leaveContext() { 1003 mRecycler = null; 1004 mState = null; 1005 } 1006 1007 /** 1008 * Re-initialize data structures for a data change or handling invisible 1009 * selection. The method tries its best to preserve position information so 1010 * that staggered grid looks same before and after re-initialize. 1011 * @return true if can fastRelayout() 1012 */ 1013 private boolean layoutInit() { 1014 boolean focusViewWasInTree = mGrid != null && mFocusPosition >= 0 1015 && mFocusPosition >= mGrid.getFirstVisibleIndex() 1016 && mFocusPosition <= mGrid.getLastVisibleIndex(); 1017 final int newItemCount = mState.getItemCount(); 1018 if (newItemCount == 0) { 1019 mFocusPosition = NO_POSITION; 1020 mSubFocusPosition = 0; 1021 } else if (mFocusPosition >= newItemCount) { 1022 mFocusPosition = newItemCount - 1; 1023 mSubFocusPosition = 0; 1024 } else if (mFocusPosition == NO_POSITION && newItemCount > 0) { 1025 // if focus position is never set before, initialize it to 0 1026 mFocusPosition = 0; 1027 mSubFocusPosition = 0; 1028 } 1029 if (!mState.didStructureChange() && mGrid.getFirstVisibleIndex() >= 0 && 1030 !mForceFullLayout && mGrid != null && mGrid.getNumRows() == mNumRows) { 1031 updateScrollController(); 1032 updateScrollSecondAxis(); 1033 mGrid.setMargin(mMarginPrimary); 1034 if (!focusViewWasInTree && mFocusPosition != NO_POSITION) { 1035 mGrid.setStart(mFocusPosition); 1036 } 1037 return true; 1038 } else { 1039 mForceFullLayout = false; 1040 int firstVisibleIndex = focusViewWasInTree ? mGrid.getFirstVisibleIndex() : 0; 1041 1042 if (mGrid == null || mNumRows != mGrid.getNumRows() || 1043 mReverseFlowPrimary != mGrid.isReversedFlow()) { 1044 mGrid = Grid.createGrid(mNumRows); 1045 mGrid.setProvider(mGridProvider); 1046 mGrid.setReversedFlow(mReverseFlowPrimary); 1047 } 1048 initScrollController(); 1049 updateScrollSecondAxis(); 1050 mGrid.setMargin(mMarginPrimary); 1051 detachAndScrapAttachedViews(mRecycler); 1052 mGrid.resetVisibleIndex(); 1053 if (mFocusPosition == NO_POSITION) { 1054 mBaseGridView.clearFocus(); 1055 } 1056 mWindowAlignment.mainAxis().invalidateScrollMin(); 1057 mWindowAlignment.mainAxis().invalidateScrollMax(); 1058 if (focusViewWasInTree && firstVisibleIndex <= mFocusPosition) { 1059 // if focusView was in tree, we will add item from first visible item 1060 mGrid.setStart(firstVisibleIndex); 1061 } else { 1062 // if focusView was not in tree, it's probably because focus position jumped 1063 // far away from visible range, so use mFocusPosition as start 1064 mGrid.setStart(mFocusPosition); 1065 } 1066 return false; 1067 } 1068 } 1069 1070 private int getRowSizeSecondary(int rowIndex) { 1071 if (mFixedRowSizeSecondary != 0) { 1072 return mFixedRowSizeSecondary; 1073 } 1074 if (mRowSizeSecondary == null) { 1075 return 0; 1076 } 1077 return mRowSizeSecondary[rowIndex]; 1078 } 1079 1080 private int getRowStartSecondary(int rowIndex) { 1081 int start = 0; 1082 // Iterate from left to right, which is a different index traversal 1083 // in RTL flow 1084 if (mReverseFlowSecondary) { 1085 for (int i = mNumRows-1; i > rowIndex; i--) { 1086 start += getRowSizeSecondary(i) + mMarginSecondary; 1087 } 1088 } else { 1089 for (int i = 0; i < rowIndex; i++) { 1090 start += getRowSizeSecondary(i) + mMarginSecondary; 1091 } 1092 } 1093 return start; 1094 } 1095 1096 private int getSizeSecondary() { 1097 int rightmostIndex = mReverseFlowSecondary ? 0 : mNumRows - 1; 1098 return getRowStartSecondary(rightmostIndex) + getRowSizeSecondary(rightmostIndex); 1099 } 1100 1101 int getDecoratedMeasuredWidthWithMargin(View v) { 1102 final LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1103 return getDecoratedMeasuredWidth(v) + lp.leftMargin + lp.rightMargin; 1104 } 1105 1106 int getDecoratedMeasuredHeightWithMargin(View v) { 1107 final LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1108 return getDecoratedMeasuredHeight(v) + lp.topMargin + lp.bottomMargin; 1109 } 1110 1111 private void measureScrapChild(int position, int widthSpec, int heightSpec, 1112 int[] measuredDimension) { 1113 View view = mRecycler.getViewForPosition(position); 1114 if (view != null) { 1115 final LayoutParams p = (LayoutParams) view.getLayoutParams(); 1116 calculateItemDecorationsForChild(view, sTempRect); 1117 int widthUsed = p.leftMargin + p.rightMargin + sTempRect.left + sTempRect.right; 1118 int heightUsed = p.topMargin + p.bottomMargin + sTempRect.top + sTempRect.bottom; 1119 1120 int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, 1121 getPaddingLeft() + getPaddingRight() + widthUsed, p.width); 1122 int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, 1123 getPaddingTop() + getPaddingBottom() + heightUsed, p.height); 1124 view.measure(childWidthSpec, childHeightSpec); 1125 1126 measuredDimension[0] = getDecoratedMeasuredWidthWithMargin(view); 1127 measuredDimension[1] = getDecoratedMeasuredHeightWithMargin(view); 1128 mRecycler.recycleView(view); 1129 } 1130 } 1131 1132 private boolean processRowSizeSecondary(boolean measure) { 1133 if (mFixedRowSizeSecondary != 0 || mRowSizeSecondary == null) { 1134 return false; 1135 } 1136 1137 if (TRACE) TraceHelper.beginSection("processRowSizeSecondary"); 1138 CircularIntArray[] rows = mGrid == null ? null : mGrid.getItemPositionsInRows(); 1139 boolean changed = false; 1140 int scrapChildWidth = -1; 1141 int scrapChildHeight = -1; 1142 1143 for (int rowIndex = 0; rowIndex < mNumRows; rowIndex++) { 1144 CircularIntArray row = rows == null ? null : rows[rowIndex]; 1145 final int rowItemsPairCount = row == null ? 0 : row.size(); 1146 int rowSize = -1; 1147 for (int rowItemPairIndex = 0; rowItemPairIndex < rowItemsPairCount; 1148 rowItemPairIndex += 2) { 1149 final int rowIndexStart = row.get(rowItemPairIndex); 1150 final int rowIndexEnd = row.get(rowItemPairIndex + 1); 1151 for (int i = rowIndexStart; i <= rowIndexEnd; i++) { 1152 final View view = findViewByPosition(i); 1153 if (view == null) { 1154 continue; 1155 } 1156 if (measure && view.isLayoutRequested()) { 1157 measureChild(view); 1158 } 1159 final int secondarySize = mOrientation == HORIZONTAL ? 1160 getDecoratedMeasuredHeightWithMargin(view) 1161 : getDecoratedMeasuredWidthWithMargin(view); 1162 if (secondarySize > rowSize) { 1163 rowSize = secondarySize; 1164 } 1165 } 1166 } 1167 1168 final int itemCount = mState.getItemCount(); 1169 if (measure && rowSize < 0 && itemCount > 0) { 1170 if (scrapChildWidth < 0 && scrapChildHeight < 0) { 1171 int position; 1172 if (mFocusPosition == NO_POSITION) { 1173 position = 0; 1174 } else if (mFocusPosition >= itemCount) { 1175 position = itemCount - 1; 1176 } else { 1177 position = mFocusPosition; 1178 } 1179 measureScrapChild(position, 1180 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1181 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1182 mMeasuredDimension); 1183 scrapChildWidth = mMeasuredDimension[0]; 1184 scrapChildHeight = mMeasuredDimension[1]; 1185 if (DEBUG) Log.v(TAG, "measured scrap child: " + scrapChildWidth + 1186 " " + scrapChildHeight); 1187 } 1188 rowSize = mOrientation == HORIZONTAL ? scrapChildHeight : scrapChildWidth; 1189 } 1190 if (rowSize < 0) { 1191 rowSize = 0; 1192 } 1193 if (mRowSizeSecondary[rowIndex] != rowSize) { 1194 if (DEBUG) Log.v(getTag(), "row size secondary changed: " + mRowSizeSecondary[rowIndex] + 1195 ", " + rowSize); 1196 mRowSizeSecondary[rowIndex] = rowSize; 1197 changed = true; 1198 } 1199 } 1200 1201 if (TRACE) TraceHelper.endSection(); 1202 return changed; 1203 } 1204 1205 /** 1206 * Checks if we need to update row secondary sizes. 1207 */ 1208 private void updateRowSecondarySizeRefresh() { 1209 mRowSecondarySizeRefresh = processRowSizeSecondary(false); 1210 if (mRowSecondarySizeRefresh) { 1211 if (DEBUG) Log.v(getTag(), "mRowSecondarySizeRefresh now set"); 1212 forceRequestLayout(); 1213 } 1214 } 1215 1216 private void forceRequestLayout() { 1217 if (DEBUG) Log.v(getTag(), "forceRequestLayout"); 1218 // RecyclerView prevents us from requesting layout in many cases 1219 // (during layout, during scroll, etc.) 1220 // For secondary row size wrap_content support we currently need a 1221 // second layout pass to update the measured size after having measured 1222 // and added child views in layoutChildren. 1223 // Force the second layout by posting a delayed runnable. 1224 // TODO: investigate allowing a second layout pass, 1225 // or move child add/measure logic to the measure phase. 1226 ViewCompat.postOnAnimation(mBaseGridView, mRequestLayoutRunnable); 1227 } 1228 1229 private final Runnable mRequestLayoutRunnable = new Runnable() { 1230 @Override 1231 public void run() { 1232 if (DEBUG) Log.v(getTag(), "request Layout from runnable"); 1233 requestLayout(); 1234 } 1235 }; 1236 1237 @Override 1238 public void onMeasure(Recycler recycler, State state, int widthSpec, int heightSpec) { 1239 saveContext(recycler, state); 1240 1241 int sizePrimary, sizeSecondary, modeSecondary, paddingSecondary; 1242 int measuredSizeSecondary; 1243 if (mOrientation == HORIZONTAL) { 1244 sizePrimary = MeasureSpec.getSize(widthSpec); 1245 sizeSecondary = MeasureSpec.getSize(heightSpec); 1246 modeSecondary = MeasureSpec.getMode(heightSpec); 1247 paddingSecondary = getPaddingTop() + getPaddingBottom(); 1248 } else { 1249 sizeSecondary = MeasureSpec.getSize(widthSpec); 1250 sizePrimary = MeasureSpec.getSize(heightSpec); 1251 modeSecondary = MeasureSpec.getMode(widthSpec); 1252 paddingSecondary = getPaddingLeft() + getPaddingRight(); 1253 } 1254 if (DEBUG) Log.v(getTag(), "onMeasure widthSpec " + Integer.toHexString(widthSpec) + 1255 " heightSpec " + Integer.toHexString(heightSpec) + 1256 " modeSecondary " + Integer.toHexString(modeSecondary) + 1257 " sizeSecondary " + sizeSecondary + " " + this); 1258 1259 mMaxSizeSecondary = sizeSecondary; 1260 1261 if (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) { 1262 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1263 mFixedRowSizeSecondary = 0; 1264 1265 if (mRowSizeSecondary == null || mRowSizeSecondary.length != mNumRows) { 1266 mRowSizeSecondary = new int[mNumRows]; 1267 } 1268 1269 // Measure all current children and update cached row heights 1270 processRowSizeSecondary(true); 1271 1272 switch (modeSecondary) { 1273 case MeasureSpec.UNSPECIFIED: 1274 measuredSizeSecondary = getSizeSecondary() + paddingSecondary; 1275 break; 1276 case MeasureSpec.AT_MOST: 1277 measuredSizeSecondary = Math.min(getSizeSecondary() + paddingSecondary, 1278 mMaxSizeSecondary); 1279 break; 1280 case MeasureSpec.EXACTLY: 1281 measuredSizeSecondary = mMaxSizeSecondary; 1282 break; 1283 default: 1284 throw new IllegalStateException("wrong spec"); 1285 } 1286 1287 } else { 1288 switch (modeSecondary) { 1289 case MeasureSpec.UNSPECIFIED: 1290 mFixedRowSizeSecondary = mRowSizeSecondaryRequested == 0 ? 1291 sizeSecondary - paddingSecondary: mRowSizeSecondaryRequested; 1292 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1293 measuredSizeSecondary = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1294 * (mNumRows - 1) + paddingSecondary; 1295 break; 1296 case MeasureSpec.AT_MOST: 1297 case MeasureSpec.EXACTLY: 1298 if (mNumRowsRequested == 0 && mRowSizeSecondaryRequested == 0) { 1299 mNumRows = 1; 1300 mFixedRowSizeSecondary = sizeSecondary - paddingSecondary; 1301 } else if (mNumRowsRequested == 0) { 1302 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1303 mNumRows = (sizeSecondary + mMarginSecondary) 1304 / (mRowSizeSecondaryRequested + mMarginSecondary); 1305 } else if (mRowSizeSecondaryRequested == 0) { 1306 mNumRows = mNumRowsRequested; 1307 mFixedRowSizeSecondary = (sizeSecondary - paddingSecondary - mMarginSecondary 1308 * (mNumRows - 1)) / mNumRows; 1309 } else { 1310 mNumRows = mNumRowsRequested; 1311 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1312 } 1313 measuredSizeSecondary = sizeSecondary; 1314 if (modeSecondary == MeasureSpec.AT_MOST) { 1315 int childrenSize = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1316 * (mNumRows - 1) + paddingSecondary; 1317 if (childrenSize < measuredSizeSecondary) { 1318 measuredSizeSecondary = childrenSize; 1319 } 1320 } 1321 break; 1322 default: 1323 throw new IllegalStateException("wrong spec"); 1324 } 1325 } 1326 if (mOrientation == HORIZONTAL) { 1327 setMeasuredDimension(sizePrimary, measuredSizeSecondary); 1328 } else { 1329 setMeasuredDimension(measuredSizeSecondary, sizePrimary); 1330 } 1331 if (DEBUG) { 1332 Log.v(getTag(), "onMeasure sizePrimary " + sizePrimary + 1333 " measuredSizeSecondary " + measuredSizeSecondary + 1334 " mFixedRowSizeSecondary " + mFixedRowSizeSecondary + 1335 " mNumRows " + mNumRows); 1336 } 1337 leaveContext(); 1338 } 1339 1340 private void measureChild(View child) { 1341 if (TRACE) TraceHelper.beginSection("measureChild"); 1342 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 1343 calculateItemDecorationsForChild(child, sTempRect); 1344 int widthUsed = lp.leftMargin + lp.rightMargin + sTempRect.left + sTempRect.right; 1345 int heightUsed = lp.topMargin + lp.bottomMargin + sTempRect.top + sTempRect.bottom; 1346 1347 final int secondarySpec = (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) ? 1348 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) : 1349 MeasureSpec.makeMeasureSpec(mFixedRowSizeSecondary, MeasureSpec.EXACTLY); 1350 int widthSpec, heightSpec; 1351 1352 if (mOrientation == HORIZONTAL) { 1353 widthSpec = ViewGroup.getChildMeasureSpec( 1354 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), widthUsed, lp.width); 1355 heightSpec = ViewGroup.getChildMeasureSpec(secondarySpec, heightUsed, lp.height); 1356 } else { 1357 heightSpec = ViewGroup.getChildMeasureSpec( 1358 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed, lp.height); 1359 widthSpec = ViewGroup.getChildMeasureSpec(secondarySpec, widthUsed, lp.width); 1360 } 1361 child.measure(widthSpec, heightSpec); 1362 if (DEBUG) Log.v(getTag(), "measureChild secondarySpec " + Integer.toHexString(secondarySpec) + 1363 " widthSpec " + Integer.toHexString(widthSpec) + 1364 " heightSpec " + Integer.toHexString(heightSpec) + 1365 " measuredWidth " + child.getMeasuredWidth() + 1366 " measuredHeight " + child.getMeasuredHeight()); 1367 if (DEBUG) Log.v(getTag(), "child lp width " + lp.width + " height " + lp.height); 1368 if (TRACE) TraceHelper.endSection(); 1369 } 1370 1371 /** 1372 * Get facet from the ViewHolder or the viewType. 1373 */ 1374 private <E> E getFacet(RecyclerView.ViewHolder vh, Class<? extends E> facetClass) { 1375 E facet = null; 1376 if (vh instanceof FacetProvider) { 1377 facet = (E) ((FacetProvider) vh).getFacet(facetClass); 1378 } 1379 if (facet == null && mFacetProviderAdapter != null) { 1380 FacetProvider p = mFacetProviderAdapter.getFacetProvider(vh.getItemViewType()); 1381 if (p != null) { 1382 facet = (E) p.getFacet(facetClass); 1383 } 1384 } 1385 return facet; 1386 } 1387 1388 private Grid.Provider mGridProvider = new Grid.Provider() { 1389 1390 @Override 1391 public int getCount() { 1392 return mState.getItemCount(); 1393 } 1394 1395 @Override 1396 public int createItem(int index, boolean append, Object[] item) { 1397 if (TRACE) TraceHelper.beginSection("createItem"); 1398 if (TRACE) TraceHelper.beginSection("getview"); 1399 View v = getViewForPosition(index); 1400 if (TRACE) TraceHelper.endSection(); 1401 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1402 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1403 lp.setItemAlignmentFacet((ItemAlignmentFacet)getFacet(vh, ItemAlignmentFacet.class)); 1404 // See recyclerView docs: we don't need re-add scraped view if it was removed. 1405 if (!lp.isItemRemoved()) { 1406 if (TRACE) TraceHelper.beginSection("addView"); 1407 if (append) { 1408 addView(v); 1409 } else { 1410 addView(v, 0); 1411 } 1412 if (TRACE) TraceHelper.endSection(); 1413 if (mChildVisibility != -1) { 1414 v.setVisibility(mChildVisibility); 1415 } 1416 1417 if (mPendingMoveSmoothScroller != null) { 1418 mPendingMoveSmoothScroller.consumePendingMovesBeforeLayout(); 1419 } 1420 int subindex = getSubPositionByView(v, v.findFocus()); 1421 if (!mInLayout) { 1422 // when we are appending item during scroll pass and the item's position 1423 // matches the mFocusPosition, we should signal a childSelected event. 1424 // However if we are still running PendingMoveSmoothScroller, we defer and 1425 // signal the event in PendingMoveSmoothScroller.onStop(). This can 1426 // avoid lots of childSelected events during a long smooth scrolling and 1427 // increase performance. 1428 if (index == mFocusPosition && subindex == mSubFocusPosition 1429 && mPendingMoveSmoothScroller == null) { 1430 dispatchChildSelected(); 1431 } 1432 } else if (!mInFastRelayout) { 1433 // fastRelayout will dispatch event at end of onLayoutChildren(). 1434 // For full layout, two situations here: 1435 // 1. mInLayoutSearchFocus is false, dispatchChildSelected() at mFocusPosition. 1436 // 2. mInLayoutSearchFocus is true: dispatchChildSelected() on first child 1437 // equal to or after mFocusPosition that can take focus. 1438 if (!mInLayoutSearchFocus && index == mFocusPosition 1439 && subindex == mSubFocusPosition) { 1440 dispatchChildSelected(); 1441 } else if (mInLayoutSearchFocus && index >= mFocusPosition 1442 && v.hasFocusable()) { 1443 mFocusPosition = index; 1444 mSubFocusPosition = subindex; 1445 mInLayoutSearchFocus = false; 1446 dispatchChildSelected(); 1447 } 1448 } 1449 measureChild(v); 1450 } 1451 item[0] = v; 1452 return mOrientation == HORIZONTAL ? getDecoratedMeasuredWidthWithMargin(v) 1453 : getDecoratedMeasuredHeightWithMargin(v); 1454 } 1455 1456 @Override 1457 public void addItem(Object item, int index, int length, int rowIndex, int edge) { 1458 View v = (View) item; 1459 int start, end; 1460 if (edge == Integer.MIN_VALUE || edge == Integer.MAX_VALUE) { 1461 edge = !mGrid.isReversedFlow() ? mWindowAlignment.mainAxis().getPaddingLow() 1462 : mWindowAlignment.mainAxis().getSize() 1463 - mWindowAlignment.mainAxis().getPaddingHigh(); 1464 } 1465 boolean edgeIsMin = !mGrid.isReversedFlow(); 1466 if (edgeIsMin) { 1467 start = edge; 1468 end = edge + length; 1469 } else { 1470 start = edge - length; 1471 end = edge; 1472 } 1473 int startSecondary = getRowStartSecondary(rowIndex) - mScrollOffsetSecondary; 1474 mChildrenStates.loadView(v, index); 1475 layoutChild(rowIndex, v, start, end, startSecondary); 1476 if (DEBUG) { 1477 Log.d(getTag(), "addView " + index + " " + v); 1478 } 1479 if (TRACE) TraceHelper.endSection(); 1480 1481 if (index == mGrid.getFirstVisibleIndex()) { 1482 if (!mGrid.isReversedFlow()) { 1483 updateScrollMin(); 1484 } else { 1485 updateScrollMax(); 1486 } 1487 } 1488 if (index == mGrid.getLastVisibleIndex()) { 1489 if (!mGrid.isReversedFlow()) { 1490 updateScrollMax(); 1491 } else { 1492 updateScrollMin(); 1493 } 1494 } 1495 if (!mInLayout && mPendingMoveSmoothScroller != null) { 1496 mPendingMoveSmoothScroller.consumePendingMovesAfterLayout(); 1497 } 1498 if (mChildLaidOutListener != null) { 1499 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1500 mChildLaidOutListener.onChildLaidOut(mBaseGridView, v, index, 1501 vh == null ? NO_ID : vh.getItemId()); 1502 } 1503 } 1504 1505 @Override 1506 public void removeItem(int index) { 1507 if (TRACE) TraceHelper.beginSection("removeItem"); 1508 View v = findViewByPosition(index); 1509 if (mInLayout) { 1510 detachAndScrapView(v, mRecycler); 1511 } else { 1512 removeAndRecycleView(v, mRecycler); 1513 } 1514 if (TRACE) TraceHelper.endSection(); 1515 } 1516 1517 @Override 1518 public int getEdge(int index) { 1519 if (mReverseFlowPrimary) { 1520 return getViewMax(findViewByPosition(index)); 1521 } else { 1522 return getViewMin(findViewByPosition(index)); 1523 } 1524 } 1525 1526 @Override 1527 public int getSize(int index) { 1528 return getViewPrimarySize(findViewByPosition(index)); 1529 } 1530 }; 1531 1532 private void layoutChild(int rowIndex, View v, int start, int end, int startSecondary) { 1533 if (TRACE) TraceHelper.beginSection("layoutChild"); 1534 int sizeSecondary = mOrientation == HORIZONTAL ? getDecoratedMeasuredHeightWithMargin(v) 1535 : getDecoratedMeasuredWidthWithMargin(v); 1536 if (mFixedRowSizeSecondary > 0) { 1537 sizeSecondary = Math.min(sizeSecondary, mFixedRowSizeSecondary); 1538 } 1539 final int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; 1540 final int horizontalGravity = (mReverseFlowPrimary || mReverseFlowSecondary) ? 1541 Gravity.getAbsoluteGravity(mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK, View.LAYOUT_DIRECTION_RTL) : 1542 mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; 1543 if (mOrientation == HORIZONTAL && verticalGravity == Gravity.TOP 1544 || mOrientation == VERTICAL && horizontalGravity == Gravity.LEFT) { 1545 // do nothing 1546 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.BOTTOM 1547 || mOrientation == VERTICAL && horizontalGravity == Gravity.RIGHT) { 1548 startSecondary += getRowSizeSecondary(rowIndex) - sizeSecondary; 1549 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.CENTER_VERTICAL 1550 || mOrientation == VERTICAL && horizontalGravity == Gravity.CENTER_HORIZONTAL) { 1551 startSecondary += (getRowSizeSecondary(rowIndex) - sizeSecondary) / 2; 1552 } 1553 int left, top, right, bottom; 1554 if (mOrientation == HORIZONTAL) { 1555 left = start; 1556 top = startSecondary; 1557 right = end; 1558 bottom = startSecondary + sizeSecondary; 1559 } else { 1560 top = start; 1561 left = startSecondary; 1562 bottom = end; 1563 right = startSecondary + sizeSecondary; 1564 } 1565 LayoutParams params = (LayoutParams) v.getLayoutParams(); 1566 layoutDecorated(v, left + params.leftMargin, top + params.topMargin, 1567 right - params.rightMargin, bottom - params.bottomMargin); 1568 updateChildOpticalInsets(v, left, top, right, bottom); 1569 updateChildAlignments(v); 1570 if (TRACE) TraceHelper.endSection(); 1571 } 1572 1573 private void updateChildOpticalInsets(View v, int left, int top, int right, int bottom) { 1574 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1575 p.setOpticalInsets(left - v.getLeft(), top - v.getTop(), 1576 v.getRight() - right, v.getBottom() - bottom); 1577 } 1578 1579 private void updateChildAlignments(View v) { 1580 final LayoutParams p = (LayoutParams) v.getLayoutParams(); 1581 if (p.getItemAlignmentFacet() == null) { 1582 // Fallback to global settings on grid view 1583 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1584 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1585 } else { 1586 // Use ItemAlignmentFacet defined on specific ViewHolder 1587 p.calculateItemAlignments(mOrientation, v); 1588 if (mOrientation == HORIZONTAL) { 1589 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1590 } else { 1591 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1592 } 1593 } 1594 } 1595 1596 private void updateChildAlignments() { 1597 for (int i = 0, c = getChildCount(); i < c; i++) { 1598 updateChildAlignments(getChildAt(i)); 1599 } 1600 } 1601 1602 void setExtraLayoutSpace(int extraLayoutSpace) { 1603 if (mExtraLayoutSpace == extraLayoutSpace) { 1604 return; 1605 } else if (mExtraLayoutSpace < 0) { 1606 throw new IllegalArgumentException("ExtraLayoutSpace must >= 0"); 1607 } 1608 mExtraLayoutSpace = extraLayoutSpace; 1609 requestLayout(); 1610 } 1611 1612 int getExtraLayoutSpace() { 1613 return mExtraLayoutSpace; 1614 } 1615 1616 private void removeInvisibleViewsAtEnd() { 1617 if (mPruneChild) { 1618 mGrid.removeInvisibleItemsAtEnd(mFocusPosition, 1619 mReverseFlowPrimary ? -mExtraLayoutSpace : mSizePrimary + mExtraLayoutSpace); 1620 } 1621 } 1622 1623 private void removeInvisibleViewsAtFront() { 1624 if (mPruneChild) { 1625 mGrid.removeInvisibleItemsAtFront(mFocusPosition, 1626 mReverseFlowPrimary ? mSizePrimary + mExtraLayoutSpace: -mExtraLayoutSpace); 1627 } 1628 } 1629 1630 private boolean appendOneColumnVisibleItems() { 1631 return mGrid.appendOneColumnVisibleItems(); 1632 } 1633 1634 private boolean prependOneColumnVisibleItems() { 1635 return mGrid.prependOneColumnVisibleItems(); 1636 } 1637 1638 private void appendVisibleItems() { 1639 mGrid.appendVisibleItems(mReverseFlowPrimary ? -mExtraLayoutSpace 1640 : mSizePrimary + mExtraLayoutSpace); 1641 } 1642 1643 private void prependVisibleItems() { 1644 mGrid.prependVisibleItems(mReverseFlowPrimary ? mSizePrimary + mExtraLayoutSpace 1645 : -mExtraLayoutSpace); 1646 } 1647 1648 /** 1649 * Fast layout when there is no structure change, adapter change, etc. 1650 * It will layout all views was layout requested or updated, until hit a view 1651 * with different size, then it break and detachAndScrap all views after that. 1652 */ 1653 private void fastRelayout() { 1654 boolean invalidateAfter = false; 1655 final int childCount = getChildCount(); 1656 int position = -1; 1657 for (int index = 0; index < childCount; index++) { 1658 View view = getChildAt(index); 1659 position = getPositionByIndex(index); 1660 Grid.Location location = mGrid.getLocation(position); 1661 if (location == null) { 1662 if (DEBUG) Log.w(getTag(), "fastRelayout(): no Location at " + position); 1663 invalidateAfter = true; 1664 break; 1665 } 1666 1667 int startSecondary = getRowStartSecondary(location.row) - mScrollOffsetSecondary; 1668 int primarySize, end; 1669 int start = getViewMin(view); 1670 int oldPrimarySize = getViewPrimarySize(view); 1671 1672 LayoutParams lp = (LayoutParams) view.getLayoutParams(); 1673 if (lp.viewNeedsUpdate()) { 1674 int viewIndex = mBaseGridView.indexOfChild(view); 1675 detachAndScrapView(view, mRecycler); 1676 view = getViewForPosition(position); 1677 addView(view, viewIndex); 1678 } 1679 1680 if (view.isLayoutRequested()) { 1681 measureChild(view); 1682 } 1683 if (mOrientation == HORIZONTAL) { 1684 primarySize = getDecoratedMeasuredWidthWithMargin(view); 1685 end = start + primarySize; 1686 } else { 1687 primarySize = getDecoratedMeasuredHeightWithMargin(view); 1688 end = start + primarySize; 1689 } 1690 layoutChild(location.row, view, start, end, startSecondary); 1691 if (oldPrimarySize != primarySize) { 1692 // size changed invalidate remaining Locations 1693 if (DEBUG) Log.d(getTag(), "fastRelayout: view size changed at " + position); 1694 invalidateAfter = true; 1695 break; 1696 } 1697 } 1698 if (invalidateAfter) { 1699 final int savedLastPos = mGrid.getLastVisibleIndex(); 1700 mGrid.invalidateItemsAfter(position); 1701 if (mPruneChild) { 1702 // in regular prune child mode, we just append items up to edge limit 1703 appendVisibleItems(); 1704 if (mFocusPosition >= 0 && mFocusPosition <= savedLastPos) { 1705 // make sure add focus view back: the view might be outside edge limit 1706 // when there is delta in onLayoutChildren(). 1707 while (mGrid.getLastVisibleIndex() < mFocusPosition) { 1708 mGrid.appendOneColumnVisibleItems(); 1709 } 1710 } 1711 } else { 1712 // prune disabled(e.g. in RowsFragment transition): append all removed items 1713 while (mGrid.appendOneColumnVisibleItems() 1714 && mGrid.getLastVisibleIndex() < savedLastPos); 1715 } 1716 } 1717 updateScrollMin(); 1718 updateScrollMax(); 1719 updateScrollSecondAxis(); 1720 } 1721 1722 public void removeAndRecycleAllViews(RecyclerView.Recycler recycler) { 1723 if (TRACE) TraceHelper.beginSection("removeAndRecycleAllViews"); 1724 if (DEBUG) Log.v(TAG, "removeAndRecycleAllViews " + getChildCount()); 1725 for (int i = getChildCount() - 1; i >= 0; i--) { 1726 removeAndRecycleViewAt(i, recycler); 1727 } 1728 if (TRACE) TraceHelper.endSection(); 1729 } 1730 1731 // Lays out items based on the current scroll position 1732 @Override 1733 public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { 1734 if (DEBUG) { 1735 Log.v(getTag(), "layoutChildren start numRows " + mNumRows + " mScrollOffsetSecondary " 1736 + mScrollOffsetSecondary + " mScrollOffsetPrimary " + mScrollOffsetPrimary 1737 + " inPreLayout " + state.isPreLayout() 1738 + " didStructureChange " + state.didStructureChange() 1739 + " mForceFullLayout " + mForceFullLayout); 1740 Log.v(getTag(), "width " + getWidth() + " height " + getHeight()); 1741 } 1742 1743 if (mNumRows == 0) { 1744 // haven't done measure yet 1745 return; 1746 } 1747 final int itemCount = state.getItemCount(); 1748 if (itemCount < 0) { 1749 return; 1750 } 1751 1752 if (!mLayoutEnabled) { 1753 discardLayoutInfo(); 1754 removeAndRecycleAllViews(recycler); 1755 return; 1756 } 1757 mInLayout = true; 1758 1759 if (state.didStructureChange()) { 1760 // didStructureChange() == true means attached item has been removed/added. 1761 // scroll animation: we are unable to continue a scroll animation, 1762 // kill the scroll animation, and let ItemAnimation move the item to new position. 1763 // position smooth scroller: kill the animation and stop at final position. 1764 // pending smooth scroller: stop and scroll to current focus position. 1765 mBaseGridView.stopScroll(); 1766 } 1767 final boolean scrollToFocus = !isSmoothScrolling() 1768 && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED; 1769 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 1770 mFocusPosition = mFocusPosition + mFocusPositionOffset; 1771 mSubFocusPosition = 0; 1772 } 1773 mFocusPositionOffset = 0; 1774 saveContext(recycler, state); 1775 1776 // Track the old focus view so we can adjust our system scroll position 1777 // so that any scroll animations happening now will remain valid. 1778 // We must use same delta in Pre Layout (if prelayout exists) and second layout. 1779 // So we cache the deltas in PreLayout and use it in second layout. 1780 int delta = 0, deltaSecondary = 0; 1781 if (mFocusPosition != NO_POSITION && scrollToFocus 1782 && mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) { 1783 // FIXME: we should get the remaining scroll animation offset from RecyclerView 1784 View focusView = findViewByPosition(mFocusPosition); 1785 if (focusView != null) { 1786 if (getScrollPosition(focusView, focusView.findFocus(), sTwoInts)) { 1787 delta = sTwoInts[0]; 1788 deltaSecondary = sTwoInts[1]; 1789 } 1790 } 1791 } 1792 1793 boolean hadFocus = mBaseGridView.hasFocus(); 1794 int savedFocusPos = mFocusPosition; 1795 if (mInFastRelayout = layoutInit()) { 1796 fastRelayout(); 1797 // appends items till focus position. 1798 if (mFocusPosition != NO_POSITION) { 1799 View focusView = findViewByPosition(mFocusPosition); 1800 if (focusView != null) { 1801 if (scrollToFocus) { 1802 scrollToView(focusView, false); 1803 } 1804 if (hadFocus && !focusView.hasFocus()) { 1805 focusView.requestFocus(); 1806 } 1807 } 1808 } 1809 } else { 1810 mInLayoutSearchFocus = hadFocus; 1811 if (mFocusPosition != NO_POSITION) { 1812 // appends items till focus position. 1813 while (appendOneColumnVisibleItems() 1814 && findViewByPosition(mFocusPosition) == null) ; 1815 } 1816 // multiple rounds: scrollToView of first round may drag first/last child into 1817 // "visible window" and we update scrollMin/scrollMax then run second scrollToView 1818 int oldFirstVisible; 1819 int oldLastVisible; 1820 do { 1821 updateScrollMin(); 1822 updateScrollMax(); 1823 oldFirstVisible = mGrid.getFirstVisibleIndex(); 1824 oldLastVisible = mGrid.getLastVisibleIndex(); 1825 View focusView = findViewByPosition(mFocusPosition); 1826 // we need force to initialize the child view's position 1827 scrollToView(focusView, false); 1828 if (focusView != null && hadFocus && !focusView.hasFocus()) { 1829 focusView.requestFocus(); 1830 } 1831 appendVisibleItems(); 1832 prependVisibleItems(); 1833 removeInvisibleViewsAtFront(); 1834 removeInvisibleViewsAtEnd(); 1835 } while (mGrid.getFirstVisibleIndex() != oldFirstVisible || 1836 mGrid.getLastVisibleIndex() != oldLastVisible); 1837 } 1838 1839 if (scrollToFocus) { 1840 scrollDirectionPrimary(-delta); 1841 scrollDirectionSecondary(-deltaSecondary); 1842 } 1843 appendVisibleItems(); 1844 prependVisibleItems(); 1845 removeInvisibleViewsAtFront(); 1846 removeInvisibleViewsAtEnd(); 1847 1848 if (DEBUG) { 1849 StringWriter sw = new StringWriter(); 1850 PrintWriter pw = new PrintWriter(sw); 1851 mGrid.debugPrint(pw); 1852 Log.d(getTag(), sw.toString()); 1853 } 1854 1855 if (mRowSecondarySizeRefresh) { 1856 mRowSecondarySizeRefresh = false; 1857 } else { 1858 updateRowSecondarySizeRefresh(); 1859 } 1860 1861 // For fastRelayout, only dispatch event when focus position changes. 1862 if (mInFastRelayout && mFocusPosition != savedFocusPos) { 1863 dispatchChildSelected(); 1864 } else if (!mInFastRelayout && mInLayoutSearchFocus) { 1865 // For full layout we dispatchChildSelected() in createItem() unless searched all 1866 // children and found none is focusable then dispatchChildSelected() here. 1867 dispatchChildSelected(); 1868 } 1869 1870 mInLayout = false; 1871 leaveContext(); 1872 if (DEBUG) Log.v(getTag(), "layoutChildren end"); 1873 } 1874 1875 private void offsetChildrenSecondary(int increment) { 1876 final int childCount = getChildCount(); 1877 if (mOrientation == HORIZONTAL) { 1878 for (int i = 0; i < childCount; i++) { 1879 getChildAt(i).offsetTopAndBottom(increment); 1880 } 1881 } else { 1882 for (int i = 0; i < childCount; i++) { 1883 getChildAt(i).offsetLeftAndRight(increment); 1884 } 1885 } 1886 } 1887 1888 private void offsetChildrenPrimary(int increment) { 1889 final int childCount = getChildCount(); 1890 if (mOrientation == VERTICAL) { 1891 for (int i = 0; i < childCount; i++) { 1892 getChildAt(i).offsetTopAndBottom(increment); 1893 } 1894 } else { 1895 for (int i = 0; i < childCount; i++) { 1896 getChildAt(i).offsetLeftAndRight(increment); 1897 } 1898 } 1899 } 1900 1901 @Override 1902 public int scrollHorizontallyBy(int dx, Recycler recycler, RecyclerView.State state) { 1903 if (DEBUG) Log.v(getTag(), "scrollHorizontallyBy " + dx); 1904 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1905 return 0; 1906 } 1907 saveContext(recycler, state); 1908 mInScroll = true; 1909 int result; 1910 if (mOrientation == HORIZONTAL) { 1911 result = scrollDirectionPrimary(dx); 1912 } else { 1913 result = scrollDirectionSecondary(dx); 1914 } 1915 leaveContext(); 1916 mInScroll = false; 1917 return result; 1918 } 1919 1920 @Override 1921 public int scrollVerticallyBy(int dy, Recycler recycler, RecyclerView.State state) { 1922 if (DEBUG) Log.v(getTag(), "scrollVerticallyBy " + dy); 1923 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1924 return 0; 1925 } 1926 mInScroll = true; 1927 saveContext(recycler, state); 1928 int result; 1929 if (mOrientation == VERTICAL) { 1930 result = scrollDirectionPrimary(dy); 1931 } else { 1932 result = scrollDirectionSecondary(dy); 1933 } 1934 leaveContext(); 1935 mInScroll = false; 1936 return result; 1937 } 1938 1939 // scroll in main direction may add/prune views 1940 private int scrollDirectionPrimary(int da) { 1941 if (TRACE) TraceHelper.beginSection("scrollPrimary"); 1942 boolean isMaxUnknown = false, isMinUnknown = false; 1943 int minScroll = 0, maxScroll = 0; 1944 if (da > 0) { 1945 isMaxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 1946 if (!isMaxUnknown) { 1947 maxScroll = mWindowAlignment.mainAxis().getMaxScroll(); 1948 if (mScrollOffsetPrimary + da > maxScroll) { 1949 da = maxScroll - mScrollOffsetPrimary; 1950 } 1951 } 1952 } else if (da < 0) { 1953 isMinUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 1954 if (!isMinUnknown) { 1955 minScroll = mWindowAlignment.mainAxis().getMinScroll(); 1956 if (mScrollOffsetPrimary + da < minScroll) { 1957 da = minScroll - mScrollOffsetPrimary; 1958 } 1959 } 1960 } 1961 if (da == 0) { 1962 if (TRACE) TraceHelper.endSection(); 1963 return 0; 1964 } 1965 offsetChildrenPrimary(-da); 1966 mScrollOffsetPrimary += da; 1967 if (mInLayout) { 1968 if (TRACE) TraceHelper.endSection(); 1969 return da; 1970 } 1971 1972 int childCount = getChildCount(); 1973 boolean updated; 1974 1975 if (mReverseFlowPrimary ? da > 0 : da < 0) { 1976 prependVisibleItems(); 1977 } else { 1978 appendVisibleItems(); 1979 } 1980 updated = getChildCount() > childCount; 1981 childCount = getChildCount(); 1982 1983 if (TRACE) TraceHelper.beginSection("remove"); 1984 if (mReverseFlowPrimary ? da > 0 : da < 0) { 1985 removeInvisibleViewsAtEnd(); 1986 } else { 1987 removeInvisibleViewsAtFront(); 1988 } 1989 if (TRACE) TraceHelper.endSection(); 1990 updated |= getChildCount() < childCount; 1991 if (updated) { 1992 updateRowSecondarySizeRefresh(); 1993 } 1994 1995 mBaseGridView.invalidate(); 1996 if (TRACE) TraceHelper.endSection(); 1997 return da; 1998 } 1999 2000 // scroll in second direction will not add/prune views 2001 private int scrollDirectionSecondary(int dy) { 2002 if (dy == 0) { 2003 return 0; 2004 } 2005 offsetChildrenSecondary(-dy); 2006 mScrollOffsetSecondary += dy; 2007 mBaseGridView.invalidate(); 2008 return dy; 2009 } 2010 2011 private void updateScrollMax() { 2012 int highVisiblePos = (!mReverseFlowPrimary) ? mGrid.getLastVisibleIndex() 2013 : mGrid.getFirstVisibleIndex(); 2014 int highMaxPos = (!mReverseFlowPrimary) ? mState.getItemCount() - 1 : 0; 2015 if (highVisiblePos < 0) { 2016 return; 2017 } 2018 final boolean highAvailable = highVisiblePos == highMaxPos; 2019 final boolean maxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 2020 if (!highAvailable && maxUnknown) { 2021 return; 2022 } 2023 int maxEdge = mGrid.findRowMax(true, sTwoInts) + mScrollOffsetPrimary; 2024 int rowIndex = sTwoInts[0]; 2025 int pos = sTwoInts[1]; 2026 int savedMaxEdge = mWindowAlignment.mainAxis().getMaxEdge(); 2027 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 2028 int maxScroll = getPrimarySystemScrollPositionOfChildMax(findViewByPosition(pos)); 2029 mWindowAlignment.mainAxis().setMaxEdge(savedMaxEdge); 2030 2031 if (highAvailable) { 2032 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 2033 mWindowAlignment.mainAxis().setMaxScroll(maxScroll); 2034 if (DEBUG) Log.v(getTag(), "updating scroll maxEdge to " + maxEdge + 2035 " scrollMax to " + maxScroll); 2036 } else { 2037 mWindowAlignment.mainAxis().invalidateScrollMax(); 2038 if (DEBUG) Log.v(getTag(), "Invalidate scrollMax since it should be " 2039 + "greater than " + maxScroll); 2040 } 2041 } 2042 2043 private void updateScrollMin() { 2044 int lowVisiblePos = (!mReverseFlowPrimary) ? mGrid.getFirstVisibleIndex() 2045 : mGrid.getLastVisibleIndex(); 2046 int lowMinPos = (!mReverseFlowPrimary) ? 0 : mState.getItemCount() - 1; 2047 if (lowVisiblePos < 0) { 2048 return; 2049 } 2050 final boolean lowAvailable = lowVisiblePos == lowMinPos; 2051 final boolean minUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 2052 if (!lowAvailable && minUnknown) { 2053 return; 2054 } 2055 int minEdge = mGrid.findRowMin(false, sTwoInts) + mScrollOffsetPrimary; 2056 int rowIndex = sTwoInts[0]; 2057 int pos = sTwoInts[1]; 2058 int savedMinEdge = mWindowAlignment.mainAxis().getMinEdge(); 2059 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2060 int minScroll = getPrimarySystemScrollPosition(findViewByPosition(pos)); 2061 mWindowAlignment.mainAxis().setMinEdge(savedMinEdge); 2062 2063 if (lowAvailable) { 2064 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2065 mWindowAlignment.mainAxis().setMinScroll(minScroll); 2066 if (DEBUG) Log.v(getTag(), "updating scroll minEdge to " + minEdge + 2067 " scrollMin to " + minScroll); 2068 } else { 2069 mWindowAlignment.mainAxis().invalidateScrollMin(); 2070 if (DEBUG) Log.v(getTag(), "Invalidate scrollMin, since it should be " 2071 + "less than " + minScroll); 2072 } 2073 } 2074 2075 private void updateScrollSecondAxis() { 2076 mWindowAlignment.secondAxis().setMinEdge(0); 2077 mWindowAlignment.secondAxis().setMaxEdge(getSizeSecondary()); 2078 } 2079 2080 private void initScrollController() { 2081 mWindowAlignment.reset(); 2082 mWindowAlignment.horizontal.setSize(getWidth()); 2083 mWindowAlignment.vertical.setSize(getHeight()); 2084 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2085 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2086 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2087 mScrollOffsetPrimary = -mWindowAlignment.mainAxis().getPaddingLow(); 2088 mScrollOffsetSecondary = -mWindowAlignment.secondAxis().getPaddingLow(); 2089 2090 if (DEBUG) { 2091 Log.v(getTag(), "initScrollController mSizePrimary " + mSizePrimary 2092 + " mWindowAlignment " + mWindowAlignment 2093 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2094 } 2095 } 2096 2097 private void updateScrollController() { 2098 // mScrollOffsetPrimary and mScrollOffsetSecondary includes the padding. 2099 // e.g. when topPadding is 16 for horizontal grid view, the initial 2100 // mScrollOffsetSecondary is -16. fastRelayout() put views based on offsets(not padding), 2101 // when padding changes to 20, we also need update mScrollOffsetSecondary to -20 before 2102 // fastRelayout() is performed 2103 int paddingPrimaryDiff, paddingSecondaryDiff; 2104 if (mOrientation == HORIZONTAL) { 2105 paddingPrimaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2106 paddingSecondaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2107 } else { 2108 paddingPrimaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2109 paddingSecondaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2110 } 2111 mScrollOffsetPrimary -= paddingPrimaryDiff; 2112 mScrollOffsetSecondary -= paddingSecondaryDiff; 2113 2114 mWindowAlignment.horizontal.setSize(getWidth()); 2115 mWindowAlignment.vertical.setSize(getHeight()); 2116 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2117 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2118 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2119 2120 if (DEBUG) { 2121 Log.v(getTag(), "updateScrollController mSizePrimary " + mSizePrimary 2122 + " mWindowAlignment " + mWindowAlignment 2123 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2124 } 2125 } 2126 2127 public void setSelection(RecyclerView parent, int position, 2128 int primaryScrollExtra) { 2129 setSelection(parent, position, 0, false, primaryScrollExtra); 2130 } 2131 2132 public void setSelectionSmooth(RecyclerView parent, int position) { 2133 setSelection(parent, position, 0, true, 0); 2134 } 2135 2136 public void setSelectionWithSub(RecyclerView parent, int position, int subposition, 2137 int primaryScrollExtra) { 2138 setSelection(parent, position, subposition, false, primaryScrollExtra); 2139 } 2140 2141 public void setSelectionSmoothWithSub(RecyclerView parent, int position, int subposition) { 2142 setSelection(parent, position, subposition, true, 0); 2143 } 2144 2145 public int getSelection() { 2146 return mFocusPosition; 2147 } 2148 2149 public int getSubSelection() { 2150 return mSubFocusPosition; 2151 } 2152 2153 public void setSelection(RecyclerView parent, int position, int subposition, boolean smooth, 2154 int primaryScrollExtra) { 2155 if (mFocusPosition != position && position != NO_POSITION 2156 || subposition != mSubFocusPosition || primaryScrollExtra != mPrimaryScrollExtra) { 2157 scrollToSelection(parent, position, subposition, smooth, primaryScrollExtra); 2158 } 2159 } 2160 2161 private void scrollToSelection(RecyclerView parent, int position, int subposition, 2162 boolean smooth, int primaryScrollExtra) { 2163 if (TRACE) TraceHelper.beginSection("scrollToSelection"); 2164 mPrimaryScrollExtra = primaryScrollExtra; 2165 View view = findViewByPosition(position); 2166 if (view != null) { 2167 mInSelection = true; 2168 scrollToView(view, smooth); 2169 mInSelection = false; 2170 } else { 2171 mFocusPosition = position; 2172 mSubFocusPosition = subposition; 2173 mFocusPositionOffset = Integer.MIN_VALUE; 2174 if (!mLayoutEnabled) { 2175 return; 2176 } 2177 if (smooth) { 2178 if (!hasDoneFirstLayout()) { 2179 Log.w(getTag(), "setSelectionSmooth should " + 2180 "not be called before first layout pass"); 2181 return; 2182 } 2183 startPositionSmoothScroller(position); 2184 } else { 2185 mForceFullLayout = true; 2186 parent.requestLayout(); 2187 } 2188 } 2189 if (TRACE) TraceHelper.endSection(); 2190 } 2191 2192 void startPositionSmoothScroller(int position) { 2193 LinearSmoothScroller linearSmoothScroller = new GridLinearSmoothScroller() { 2194 @Override 2195 public PointF computeScrollVectorForPosition(int targetPosition) { 2196 if (getChildCount() == 0) { 2197 return null; 2198 } 2199 final int firstChildPos = getPosition(getChildAt(0)); 2200 // TODO We should be able to deduce direction from bounds of current and target 2201 // focus, rather than making assumptions about positions and directionality 2202 final boolean isStart = mReverseFlowPrimary ? targetPosition > firstChildPos 2203 : targetPosition < firstChildPos; 2204 final int direction = isStart ? -1 : 1; 2205 if (mOrientation == HORIZONTAL) { 2206 return new PointF(direction, 0); 2207 } else { 2208 return new PointF(0, direction); 2209 } 2210 } 2211 2212 }; 2213 linearSmoothScroller.setTargetPosition(position); 2214 startSmoothScroll(linearSmoothScroller); 2215 } 2216 2217 private void processPendingMovement(boolean forward) { 2218 if (forward ? hasCreatedLastItem() : hasCreatedFirstItem()) { 2219 return; 2220 } 2221 if (mPendingMoveSmoothScroller == null) { 2222 // Stop existing scroller and create a new PendingMoveSmoothScroller. 2223 mBaseGridView.stopScroll(); 2224 PendingMoveSmoothScroller linearSmoothScroller = new PendingMoveSmoothScroller( 2225 forward ? 1 : -1, mNumRows > 1); 2226 mFocusPositionOffset = 0; 2227 startSmoothScroll(linearSmoothScroller); 2228 if (linearSmoothScroller.isRunning()) { 2229 mPendingMoveSmoothScroller = linearSmoothScroller; 2230 } 2231 } else { 2232 if (forward) { 2233 mPendingMoveSmoothScroller.increasePendingMoves(); 2234 } else { 2235 mPendingMoveSmoothScroller.decreasePendingMoves(); 2236 } 2237 } 2238 } 2239 2240 @Override 2241 public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) { 2242 if (DEBUG) Log.v(getTag(), "onItemsAdded positionStart " 2243 + positionStart + " itemCount " + itemCount); 2244 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2245 int pos = mFocusPosition + mFocusPositionOffset; 2246 if (positionStart <= pos) { 2247 mFocusPositionOffset += itemCount; 2248 } 2249 } 2250 mChildrenStates.clear(); 2251 } 2252 2253 @Override 2254 public void onItemsChanged(RecyclerView recyclerView) { 2255 if (DEBUG) Log.v(getTag(), "onItemsChanged"); 2256 mFocusPositionOffset = 0; 2257 mChildrenStates.clear(); 2258 } 2259 2260 @Override 2261 public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) { 2262 if (DEBUG) Log.v(getTag(), "onItemsRemoved positionStart " 2263 + positionStart + " itemCount " + itemCount); 2264 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2265 int pos = mFocusPosition + mFocusPositionOffset; 2266 if (positionStart <= pos) { 2267 if (positionStart + itemCount > pos) { 2268 // stop updating offset after the focus item was removed 2269 mFocusPositionOffset = Integer.MIN_VALUE; 2270 } else { 2271 mFocusPositionOffset -= itemCount; 2272 } 2273 } 2274 } 2275 mChildrenStates.clear(); 2276 } 2277 2278 @Override 2279 public void onItemsMoved(RecyclerView recyclerView, int fromPosition, int toPosition, 2280 int itemCount) { 2281 if (DEBUG) Log.v(getTag(), "onItemsMoved fromPosition " 2282 + fromPosition + " toPosition " + toPosition); 2283 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2284 int pos = mFocusPosition + mFocusPositionOffset; 2285 if (fromPosition <= pos && pos < fromPosition + itemCount) { 2286 // moved items include focused position 2287 mFocusPositionOffset += toPosition - fromPosition; 2288 } else if (fromPosition < pos && toPosition > pos - itemCount) { 2289 // move items before focus position to after focused position 2290 mFocusPositionOffset -= itemCount; 2291 } else if (fromPosition > pos && toPosition < pos) { 2292 // move items after focus position to before focused position 2293 mFocusPositionOffset += itemCount; 2294 } 2295 } 2296 mChildrenStates.clear(); 2297 } 2298 2299 @Override 2300 public void onItemsUpdated(RecyclerView recyclerView, int positionStart, int itemCount) { 2301 if (DEBUG) Log.v(getTag(), "onItemsUpdated positionStart " 2302 + positionStart + " itemCount " + itemCount); 2303 for (int i = positionStart, end = positionStart + itemCount; i < end; i++) { 2304 mChildrenStates.remove(i); 2305 } 2306 } 2307 2308 @Override 2309 public boolean onRequestChildFocus(RecyclerView parent, View child, View focused) { 2310 if (mFocusSearchDisabled) { 2311 return true; 2312 } 2313 if (getPositionByView(child) == NO_POSITION) { 2314 // This shouldn't happen, but in case it does be sure not to attempt a 2315 // scroll to a view whose item has been removed. 2316 return true; 2317 } 2318 if (!mInLayout && !mInSelection && !mInScroll) { 2319 scrollToView(child, focused, true); 2320 } 2321 return true; 2322 } 2323 2324 @Override 2325 public boolean requestChildRectangleOnScreen(RecyclerView parent, View view, Rect rect, 2326 boolean immediate) { 2327 if (DEBUG) Log.v(getTag(), "requestChildRectangleOnScreen " + view + " " + rect); 2328 return false; 2329 } 2330 2331 int getScrollOffsetX() { 2332 return mOrientation == HORIZONTAL ? mScrollOffsetPrimary : mScrollOffsetSecondary; 2333 } 2334 2335 int getScrollOffsetY() { 2336 return mOrientation == HORIZONTAL ? mScrollOffsetSecondary : mScrollOffsetPrimary; 2337 } 2338 2339 public void getViewSelectedOffsets(View view, int[] offsets) { 2340 if (mOrientation == HORIZONTAL) { 2341 offsets[0] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2342 offsets[1] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2343 } else { 2344 offsets[1] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2345 offsets[0] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2346 } 2347 } 2348 2349 private int getPrimarySystemScrollPosition(View view) { 2350 final int viewCenterPrimary = mScrollOffsetPrimary + getViewCenter(view); 2351 final int viewMin = getViewMin(view); 2352 final int viewMax = getViewMax(view); 2353 // TODO: change to use State object in onRequestChildFocus() 2354 boolean isMin, isMax; 2355 if (!mReverseFlowPrimary) { 2356 isMin = mGrid.getFirstVisibleIndex() == 0; 2357 isMax = mGrid.getLastVisibleIndex() == (mState == null ? 2358 getItemCount() : mState.getItemCount()) - 1; 2359 } else { 2360 isMax = mGrid.getFirstVisibleIndex() == 0; 2361 isMin = mGrid.getLastVisibleIndex() == (mState == null ? 2362 getItemCount() : mState.getItemCount()) - 1; 2363 } 2364 for (int i = getChildCount() - 1; (isMin || isMax) && i >= 0; i--) { 2365 View v = getChildAt(i); 2366 if (v == view || v == null) { 2367 continue; 2368 } 2369 if (isMin && getViewMin(v) < viewMin) { 2370 isMin = false; 2371 } 2372 if (isMax && getViewMax(v) > viewMax) { 2373 isMax = false; 2374 } 2375 } 2376 return mWindowAlignment.mainAxis().getSystemScrollPos(viewCenterPrimary, isMin, isMax); 2377 } 2378 2379 private int getPrimarySystemScrollPositionOfChildMax(View view) { 2380 int scrollPosition = getPrimarySystemScrollPosition(view); 2381 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 2382 int[] multipleAligns = lp.getAlignMultiple(); 2383 if (multipleAligns != null && multipleAligns.length > 0) { 2384 scrollPosition += multipleAligns[multipleAligns.length - 1] - multipleAligns[0]; 2385 } 2386 return scrollPosition; 2387 } 2388 2389 /** 2390 * Get adjusted primary position for a given childView (if there is multiple ItemAlignment defined 2391 * on the view). 2392 */ 2393 private int getAdjustedPrimaryScrollPosition(int scrollPrimary, View view, View childView) { 2394 int subindex = getSubPositionByView(view, childView); 2395 if (subindex != 0) { 2396 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 2397 scrollPrimary += lp.getAlignMultiple()[subindex] - lp.getAlignMultiple()[0]; 2398 } 2399 return scrollPrimary; 2400 } 2401 2402 private int getSecondarySystemScrollPosition(View view) { 2403 int viewCenterSecondary = mScrollOffsetSecondary + getViewCenterSecondary(view); 2404 int pos = getPositionByView(view); 2405 Grid.Location location = mGrid.getLocation(pos); 2406 final int row = location.row; 2407 final boolean isMin, isMax; 2408 if (!mReverseFlowSecondary) { 2409 isMin = row == 0; 2410 isMax = row == mGrid.getNumRows() - 1; 2411 } else { 2412 isMax = row == 0; 2413 isMin = row == mGrid.getNumRows() - 1; 2414 } 2415 return mWindowAlignment.secondAxis().getSystemScrollPos(viewCenterSecondary, isMin, isMax); 2416 } 2417 2418 /** 2419 * Scroll to a given child view and change mFocusPosition. 2420 */ 2421 private void scrollToView(View view, boolean smooth) { 2422 scrollToView(view, view == null ? null : view.findFocus(), smooth); 2423 } 2424 2425 /** 2426 * Scroll to a given child view and change mFocusPosition. 2427 */ 2428 private void scrollToView(View view, View childView, boolean smooth) { 2429 int newFocusPosition = getPositionByView(view); 2430 int newSubFocusPosition = getSubPositionByView(view, childView); 2431 if (newFocusPosition != mFocusPosition || newSubFocusPosition != mSubFocusPosition) { 2432 mFocusPosition = newFocusPosition; 2433 mSubFocusPosition = newSubFocusPosition; 2434 mFocusPositionOffset = 0; 2435 if (!mInLayout) { 2436 dispatchChildSelected(); 2437 } 2438 if (mBaseGridView.isChildrenDrawingOrderEnabledInternal()) { 2439 mBaseGridView.invalidate(); 2440 } 2441 } 2442 if (view == null) { 2443 return; 2444 } 2445 if (!view.hasFocus() && mBaseGridView.hasFocus()) { 2446 // transfer focus to the child if it does not have focus yet (e.g. triggered 2447 // by setSelection()) 2448 view.requestFocus(); 2449 } 2450 if (!mScrollEnabled && smooth) { 2451 return; 2452 } 2453 if (getScrollPosition(view, childView, sTwoInts)) { 2454 scrollGrid(sTwoInts[0], sTwoInts[1], smooth); 2455 } 2456 } 2457 2458 private boolean getScrollPosition(View view, View childView, int[] deltas) { 2459 switch (mFocusScrollStrategy) { 2460 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2461 default: 2462 return getAlignedPosition(view, childView, deltas); 2463 case BaseGridView.FOCUS_SCROLL_ITEM: 2464 case BaseGridView.FOCUS_SCROLL_PAGE: 2465 return getNoneAlignedPosition(view, deltas); 2466 } 2467 } 2468 2469 private boolean getNoneAlignedPosition(View view, int[] deltas) { 2470 int pos = getPositionByView(view); 2471 int viewMin = getViewMin(view); 2472 int viewMax = getViewMax(view); 2473 // we either align "firstView" to left/top padding edge 2474 // or align "lastView" to right/bottom padding edge 2475 View firstView = null; 2476 View lastView = null; 2477 int paddingLow = mWindowAlignment.mainAxis().getPaddingLow(); 2478 int clientSize = mWindowAlignment.mainAxis().getClientSize(); 2479 final int row = mGrid.getRowIndex(pos); 2480 if (viewMin < paddingLow) { 2481 // view enters low padding area: 2482 firstView = view; 2483 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2484 // scroll one "page" left/top, 2485 // align first visible item of the "page" at the low padding edge. 2486 while (prependOneColumnVisibleItems()) { 2487 CircularIntArray positions = 2488 mGrid.getItemPositionsInRows(mGrid.getFirstVisibleIndex(), pos)[row]; 2489 firstView = findViewByPosition(positions.get(0)); 2490 if (viewMax - getViewMin(firstView) > clientSize) { 2491 if (positions.size() > 2) { 2492 firstView = findViewByPosition(positions.get(2)); 2493 } 2494 break; 2495 } 2496 } 2497 } 2498 } else if (viewMax > clientSize + paddingLow) { 2499 // view enters high padding area: 2500 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2501 // scroll whole one page right/bottom, align view at the low padding edge. 2502 firstView = view; 2503 do { 2504 CircularIntArray positions = 2505 mGrid.getItemPositionsInRows(pos, mGrid.getLastVisibleIndex())[row]; 2506 lastView = findViewByPosition(positions.get(positions.size() - 1)); 2507 if (getViewMax(lastView) - viewMin > clientSize) { 2508 lastView = null; 2509 break; 2510 } 2511 } while (appendOneColumnVisibleItems()); 2512 if (lastView != null) { 2513 // however if we reached end, we should align last view. 2514 firstView = null; 2515 } 2516 } else { 2517 lastView = view; 2518 } 2519 } 2520 int scrollPrimary = 0; 2521 int scrollSecondary = 0; 2522 if (firstView != null) { 2523 scrollPrimary = getViewMin(firstView) - paddingLow; 2524 } else if (lastView != null) { 2525 scrollPrimary = getViewMax(lastView) - (paddingLow + clientSize); 2526 } 2527 View secondaryAlignedView; 2528 if (firstView != null) { 2529 secondaryAlignedView = firstView; 2530 } else if (lastView != null) { 2531 secondaryAlignedView = lastView; 2532 } else { 2533 secondaryAlignedView = view; 2534 } 2535 scrollSecondary = getSecondarySystemScrollPosition(secondaryAlignedView); 2536 scrollSecondary -= mScrollOffsetSecondary; 2537 if (scrollPrimary != 0 || scrollSecondary != 0) { 2538 deltas[0] = scrollPrimary; 2539 deltas[1] = scrollSecondary; 2540 return true; 2541 } 2542 return false; 2543 } 2544 2545 private boolean getAlignedPosition(View view, View childView, int[] deltas) { 2546 int scrollPrimary = getPrimarySystemScrollPosition(view); 2547 if (childView != null) { 2548 scrollPrimary = getAdjustedPrimaryScrollPosition(scrollPrimary, view, childView); 2549 } 2550 int scrollSecondary = getSecondarySystemScrollPosition(view); 2551 if (DEBUG) { 2552 Log.v(getTag(), "getAlignedPosition " + scrollPrimary + " " + scrollSecondary 2553 + " " + mPrimaryScrollExtra + " " + mWindowAlignment); 2554 Log.v(getTag(), "getAlignedPosition " + mScrollOffsetPrimary + " " + mScrollOffsetSecondary); 2555 } 2556 scrollPrimary -= mScrollOffsetPrimary; 2557 scrollSecondary -= mScrollOffsetSecondary; 2558 scrollPrimary += mPrimaryScrollExtra; 2559 if (scrollPrimary != 0 || scrollSecondary != 0) { 2560 deltas[0] = scrollPrimary; 2561 deltas[1] = scrollSecondary; 2562 return true; 2563 } 2564 return false; 2565 } 2566 2567 private void scrollGrid(int scrollPrimary, int scrollSecondary, boolean smooth) { 2568 if (mInLayout) { 2569 scrollDirectionPrimary(scrollPrimary); 2570 scrollDirectionSecondary(scrollSecondary); 2571 } else { 2572 int scrollX; 2573 int scrollY; 2574 if (mOrientation == HORIZONTAL) { 2575 scrollX = scrollPrimary; 2576 scrollY = scrollSecondary; 2577 } else { 2578 scrollX = scrollSecondary; 2579 scrollY = scrollPrimary; 2580 } 2581 if (smooth) { 2582 mBaseGridView.smoothScrollBy(scrollX, scrollY); 2583 } else { 2584 mBaseGridView.scrollBy(scrollX, scrollY); 2585 } 2586 } 2587 } 2588 2589 public void setPruneChild(boolean pruneChild) { 2590 if (mPruneChild != pruneChild) { 2591 mPruneChild = pruneChild; 2592 if (mPruneChild) { 2593 requestLayout(); 2594 } 2595 } 2596 } 2597 2598 public boolean getPruneChild() { 2599 return mPruneChild; 2600 } 2601 2602 public void setScrollEnabled(boolean scrollEnabled) { 2603 if (mScrollEnabled != scrollEnabled) { 2604 mScrollEnabled = scrollEnabled; 2605 if (mScrollEnabled && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED 2606 && mFocusPosition != NO_POSITION) { 2607 scrollToSelection(mBaseGridView, mFocusPosition, mSubFocusPosition, 2608 true, mPrimaryScrollExtra); 2609 } 2610 } 2611 } 2612 2613 public boolean isScrollEnabled() { 2614 return mScrollEnabled; 2615 } 2616 2617 private int findImmediateChildIndex(View view) { 2618 while (view != null && view != mBaseGridView) { 2619 int index = mBaseGridView.indexOfChild(view); 2620 if (index >= 0) { 2621 return index; 2622 } 2623 view = (View) view.getParent(); 2624 } 2625 return NO_POSITION; 2626 } 2627 2628 void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 2629 if (gainFocus) { 2630 // if gridview.requestFocus() is called, select first focusable child. 2631 for (int i = mFocusPosition; ;i++) { 2632 View view = findViewByPosition(i); 2633 if (view == null) { 2634 break; 2635 } 2636 if (view.getVisibility() == View.VISIBLE && view.hasFocusable()) { 2637 view.requestFocus(); 2638 break; 2639 } 2640 } 2641 } 2642 } 2643 2644 void setFocusSearchDisabled(boolean disabled) { 2645 mFocusSearchDisabled = disabled; 2646 } 2647 2648 boolean isFocusSearchDisabled() { 2649 return mFocusSearchDisabled; 2650 } 2651 2652 @Override 2653 public View onInterceptFocusSearch(View focused, int direction) { 2654 if (mFocusSearchDisabled) { 2655 return focused; 2656 } 2657 return null; 2658 } 2659 2660 boolean hasPreviousViewInSameRow(int pos) { 2661 if (mGrid == null || pos == NO_POSITION || mGrid.getFirstVisibleIndex() < 0) { 2662 return false; 2663 } 2664 if (mGrid.getFirstVisibleIndex() > 0) { 2665 return true; 2666 } 2667 final int focusedRow = mGrid.getLocation(pos).row; 2668 for (int i = getChildCount() - 1; i >= 0; i--) { 2669 int position = getPositionByIndex(i); 2670 Grid.Location loc = mGrid.getLocation(position); 2671 if (loc != null && loc.row == focusedRow) { 2672 if (position < pos) { 2673 return true; 2674 } 2675 } 2676 } 2677 return false; 2678 } 2679 2680 @Override 2681 public boolean onAddFocusables(RecyclerView recyclerView, 2682 ArrayList<View> views, int direction, int focusableMode) { 2683 if (mFocusSearchDisabled) { 2684 return true; 2685 } 2686 // If this viewgroup or one of its children currently has focus then we 2687 // consider our children for focus searching in main direction on the same row. 2688 // If this viewgroup has no focus and using focus align, we want the system 2689 // to ignore our children and pass focus to the viewgroup, which will pass 2690 // focus on to its children appropriately. 2691 // If this viewgroup has no focus and not using focus align, we want to 2692 // consider the child that does not overlap with padding area. 2693 if (recyclerView.hasFocus()) { 2694 final int movement = getMovement(direction); 2695 if (movement != PREV_ITEM && movement != NEXT_ITEM) { 2696 // Move on secondary direction uses default addFocusables(). 2697 return false; 2698 } 2699 if (mPendingMoveSmoothScroller != null) { 2700 // don't find next focusable if has pending movement. 2701 return true; 2702 } 2703 final View focused = recyclerView.findFocus(); 2704 final int focusedPos = getPositionByIndex(findImmediateChildIndex(focused)); 2705 // Add focusables of focused item. 2706 if (focusedPos != NO_POSITION) { 2707 findViewByPosition(focusedPos).addFocusables(views, direction, focusableMode); 2708 } 2709 final int focusedRow = mGrid != null && focusedPos != NO_POSITION ? 2710 mGrid.getLocation(focusedPos).row : NO_POSITION; 2711 // Add focusables of next neighbor of same row on the focus search direction. 2712 if (mGrid != null) { 2713 final int focusableCount = views.size(); 2714 for (int i = 0, count = getChildCount(); i < count; i++) { 2715 int index = movement == NEXT_ITEM ? i : count - 1 - i; 2716 final View child = getChildAt(index); 2717 if (child.getVisibility() != View.VISIBLE || !child.hasFocusable()) { 2718 continue; 2719 } 2720 int position = getPositionByIndex(index); 2721 Grid.Location loc = mGrid.getLocation(position); 2722 if (focusedRow == NO_POSITION || (loc != null && loc.row == focusedRow)) { 2723 if (focusedPos == NO_POSITION || 2724 (movement == NEXT_ITEM && position > focusedPos) 2725 || (movement == PREV_ITEM && position < focusedPos)) { 2726 child.addFocusables(views, direction, focusableMode); 2727 if (views.size() > focusableCount) { 2728 break; 2729 } 2730 } 2731 } 2732 } 2733 } 2734 } else { 2735 if (mFocusScrollStrategy != BaseGridView.FOCUS_SCROLL_ALIGNED) { 2736 // adding views not overlapping padding area to avoid scrolling in gaining focus 2737 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2738 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2739 int focusableCount = views.size(); 2740 for (int i = 0, count = getChildCount(); i < count; i++) { 2741 View child = getChildAt(i); 2742 if (child.getVisibility() == View.VISIBLE) { 2743 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2744 child.addFocusables(views, direction, focusableMode); 2745 } 2746 } 2747 } 2748 // if we cannot find any, then just add all children. 2749 if (views.size() == focusableCount) { 2750 for (int i = 0, count = getChildCount(); i < count; i++) { 2751 View child = getChildAt(i); 2752 if (child.getVisibility() == View.VISIBLE) { 2753 child.addFocusables(views, direction, focusableMode); 2754 } 2755 } 2756 if (views.size() != focusableCount) { 2757 return true; 2758 } 2759 } else { 2760 return true; 2761 } 2762 // if still cannot find any, fall through and add itself 2763 } 2764 if (recyclerView.isFocusable()) { 2765 views.add(recyclerView); 2766 } 2767 } 2768 return true; 2769 } 2770 2771 private boolean hasCreatedLastItem() { 2772 int count = mState.getItemCount(); 2773 return count == 0 || findViewByPosition(count - 1) != null; 2774 } 2775 2776 private boolean hasCreatedFirstItem() { 2777 int count = mState.getItemCount(); 2778 return count == 0 || findViewByPosition(0) != null; 2779 } 2780 2781 boolean canScrollTo(View view) { 2782 return view.getVisibility() == View.VISIBLE && (!hasFocus() || view.hasFocusable()); 2783 } 2784 2785 @Override 2786 public View onFocusSearchFailed(View focused, int direction, Recycler recycler, 2787 RecyclerView.State state) { 2788 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed direction " + direction); 2789 2790 View view = null; 2791 int movement = getMovement(direction); 2792 final boolean isScroll = mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE; 2793 saveContext(recycler, state); 2794 if (movement == NEXT_ITEM) { 2795 if (isScroll || !mFocusOutEnd) { 2796 view = focused; 2797 } 2798 if (mScrollEnabled && !hasCreatedLastItem()) { 2799 processPendingMovement(true); 2800 view = focused; 2801 } 2802 } else if (movement == PREV_ITEM) { 2803 if (isScroll || !mFocusOutFront) { 2804 view = focused; 2805 } 2806 if (mScrollEnabled && !hasCreatedFirstItem()) { 2807 processPendingMovement(false); 2808 view = focused; 2809 } 2810 } 2811 leaveContext(); 2812 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed returning view " + view); 2813 return view; 2814 } 2815 2816 boolean gridOnRequestFocusInDescendants(RecyclerView recyclerView, int direction, 2817 Rect previouslyFocusedRect) { 2818 switch (mFocusScrollStrategy) { 2819 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2820 default: 2821 return gridOnRequestFocusInDescendantsAligned(recyclerView, 2822 direction, previouslyFocusedRect); 2823 case BaseGridView.FOCUS_SCROLL_PAGE: 2824 case BaseGridView.FOCUS_SCROLL_ITEM: 2825 return gridOnRequestFocusInDescendantsUnaligned(recyclerView, 2826 direction, previouslyFocusedRect); 2827 } 2828 } 2829 2830 private boolean gridOnRequestFocusInDescendantsAligned(RecyclerView recyclerView, 2831 int direction, Rect previouslyFocusedRect) { 2832 View view = findViewByPosition(mFocusPosition); 2833 if (view != null) { 2834 boolean result = view.requestFocus(direction, previouslyFocusedRect); 2835 if (!result && DEBUG) { 2836 Log.w(getTag(), "failed to request focus on " + view); 2837 } 2838 return result; 2839 } 2840 return false; 2841 } 2842 2843 private boolean gridOnRequestFocusInDescendantsUnaligned(RecyclerView recyclerView, 2844 int direction, Rect previouslyFocusedRect) { 2845 // focus to view not overlapping padding area to avoid scrolling in gaining focus 2846 int index; 2847 int increment; 2848 int end; 2849 int count = getChildCount(); 2850 if ((direction & View.FOCUS_FORWARD) != 0) { 2851 index = 0; 2852 increment = 1; 2853 end = count; 2854 } else { 2855 index = count - 1; 2856 increment = -1; 2857 end = -1; 2858 } 2859 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2860 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2861 for (int i = index; i != end; i += increment) { 2862 View child = getChildAt(i); 2863 if (child.getVisibility() == View.VISIBLE) { 2864 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2865 if (child.requestFocus(direction, previouslyFocusedRect)) { 2866 return true; 2867 } 2868 } 2869 } 2870 } 2871 return false; 2872 } 2873 2874 private final static int PREV_ITEM = 0; 2875 private final static int NEXT_ITEM = 1; 2876 private final static int PREV_ROW = 2; 2877 private final static int NEXT_ROW = 3; 2878 2879 private int getMovement(int direction) { 2880 int movement = View.FOCUS_LEFT; 2881 2882 if (mOrientation == HORIZONTAL) { 2883 switch(direction) { 2884 case View.FOCUS_LEFT: 2885 movement = (!mReverseFlowPrimary) ? PREV_ITEM : NEXT_ITEM; 2886 break; 2887 case View.FOCUS_RIGHT: 2888 movement = (!mReverseFlowPrimary) ? NEXT_ITEM : PREV_ITEM; 2889 break; 2890 case View.FOCUS_UP: 2891 movement = PREV_ROW; 2892 break; 2893 case View.FOCUS_DOWN: 2894 movement = NEXT_ROW; 2895 break; 2896 } 2897 } else if (mOrientation == VERTICAL) { 2898 switch(direction) { 2899 case View.FOCUS_LEFT: 2900 movement = (!mReverseFlowPrimary) ? PREV_ROW : NEXT_ROW; 2901 break; 2902 case View.FOCUS_RIGHT: 2903 movement = (!mReverseFlowPrimary) ? NEXT_ROW : PREV_ROW; 2904 break; 2905 case View.FOCUS_UP: 2906 movement = PREV_ITEM; 2907 break; 2908 case View.FOCUS_DOWN: 2909 movement = NEXT_ITEM; 2910 break; 2911 } 2912 } 2913 2914 return movement; 2915 } 2916 2917 int getChildDrawingOrder(RecyclerView recyclerView, int childCount, int i) { 2918 View view = findViewByPosition(mFocusPosition); 2919 if (view == null) { 2920 return i; 2921 } 2922 int focusIndex = recyclerView.indexOfChild(view); 2923 // supposely 0 1 2 3 4 5 6 7 8 9, 4 is the center item 2924 // drawing order is 0 1 2 3 9 8 7 6 5 4 2925 if (i < focusIndex) { 2926 return i; 2927 } else if (i < childCount - 1) { 2928 return focusIndex + childCount - 1 - i; 2929 } else { 2930 return focusIndex; 2931 } 2932 } 2933 2934 @Override 2935 public void onAdapterChanged(RecyclerView.Adapter oldAdapter, 2936 RecyclerView.Adapter newAdapter) { 2937 if (DEBUG) Log.v(getTag(), "onAdapterChanged to " + newAdapter); 2938 if (oldAdapter != null) { 2939 discardLayoutInfo(); 2940 mFocusPosition = NO_POSITION; 2941 mFocusPositionOffset = 0; 2942 mChildrenStates.clear(); 2943 } 2944 if (newAdapter instanceof FacetProviderAdapter) { 2945 mFacetProviderAdapter = (FacetProviderAdapter) newAdapter; 2946 } else { 2947 mFacetProviderAdapter = null; 2948 } 2949 super.onAdapterChanged(oldAdapter, newAdapter); 2950 } 2951 2952 private void discardLayoutInfo() { 2953 mGrid = null; 2954 mRowSizeSecondary = null; 2955 mRowSecondarySizeRefresh = false; 2956 } 2957 2958 public void setLayoutEnabled(boolean layoutEnabled) { 2959 if (mLayoutEnabled != layoutEnabled) { 2960 mLayoutEnabled = layoutEnabled; 2961 requestLayout(); 2962 } 2963 } 2964 2965 void setChildrenVisibility(int visiblity) { 2966 mChildVisibility = visiblity; 2967 if (mChildVisibility != -1) { 2968 int count = getChildCount(); 2969 for (int i= 0; i < count; i++) { 2970 getChildAt(i).setVisibility(mChildVisibility); 2971 } 2972 } 2973 } 2974 2975 final static class SavedState implements Parcelable { 2976 2977 int index; // index inside adapter of the current view 2978 Bundle childStates = Bundle.EMPTY; 2979 2980 @Override 2981 public void writeToParcel(Parcel out, int flags) { 2982 out.writeInt(index); 2983 out.writeBundle(childStates); 2984 } 2985 2986 @SuppressWarnings("hiding") 2987 public static final Parcelable.Creator<SavedState> CREATOR = 2988 new Parcelable.Creator<SavedState>() { 2989 @Override 2990 public SavedState createFromParcel(Parcel in) { 2991 return new SavedState(in); 2992 } 2993 2994 @Override 2995 public SavedState[] newArray(int size) { 2996 return new SavedState[size]; 2997 } 2998 }; 2999 3000 @Override 3001 public int describeContents() { 3002 return 0; 3003 } 3004 3005 SavedState(Parcel in) { 3006 index = in.readInt(); 3007 childStates = in.readBundle(GridLayoutManager.class.getClassLoader()); 3008 } 3009 3010 SavedState() { 3011 } 3012 } 3013 3014 @Override 3015 public Parcelable onSaveInstanceState() { 3016 if (DEBUG) Log.v(getTag(), "onSaveInstanceState getSelection() " + getSelection()); 3017 SavedState ss = new SavedState(); 3018 // save selected index 3019 ss.index = getSelection(); 3020 // save offscreen child (state when they are recycled) 3021 Bundle bundle = mChildrenStates.saveAsBundle(); 3022 // save views currently is on screen (TODO save cached views) 3023 for (int i = 0, count = getChildCount(); i < count; i++) { 3024 View view = getChildAt(i); 3025 int position = getPositionByView(view); 3026 if (position != NO_POSITION) { 3027 bundle = mChildrenStates.saveOnScreenView(bundle, view, position); 3028 } 3029 } 3030 ss.childStates = bundle; 3031 return ss; 3032 } 3033 3034 void onChildRecycled(RecyclerView.ViewHolder holder) { 3035 final int position = holder.getAdapterPosition(); 3036 if (position != NO_POSITION) { 3037 mChildrenStates.saveOffscreenView(holder.itemView, position); 3038 } 3039 } 3040 3041 @Override 3042 public void onRestoreInstanceState(Parcelable state) { 3043 if (!(state instanceof SavedState)) { 3044 return; 3045 } 3046 SavedState loadingState = (SavedState)state; 3047 mFocusPosition = loadingState.index; 3048 mFocusPositionOffset = 0; 3049 mChildrenStates.loadFromBundle(loadingState.childStates); 3050 mForceFullLayout = true; 3051 requestLayout(); 3052 if (DEBUG) Log.v(getTag(), "onRestoreInstanceState mFocusPosition " + mFocusPosition); 3053 } 3054 3055 @Override 3056 public int getRowCountForAccessibility(RecyclerView.Recycler recycler, 3057 RecyclerView.State state) { 3058 if (mOrientation == HORIZONTAL && mGrid != null) { 3059 return mGrid.getNumRows(); 3060 } 3061 return super.getRowCountForAccessibility(recycler, state); 3062 } 3063 3064 @Override 3065 public int getColumnCountForAccessibility(RecyclerView.Recycler recycler, 3066 RecyclerView.State state) { 3067 if (mOrientation == VERTICAL && mGrid != null) { 3068 return mGrid.getNumRows(); 3069 } 3070 return super.getColumnCountForAccessibility(recycler, state); 3071 } 3072 3073 @Override 3074 public void onInitializeAccessibilityNodeInfoForItem(RecyclerView.Recycler recycler, 3075 RecyclerView.State state, View host, AccessibilityNodeInfoCompat info) { 3076 ViewGroup.LayoutParams lp = host.getLayoutParams(); 3077 if (mGrid == null || !(lp instanceof LayoutParams)) { 3078 super.onInitializeAccessibilityNodeInfoForItem(recycler, state, host, info); 3079 return; 3080 } 3081 LayoutParams glp = (LayoutParams) lp; 3082 int position = glp.getViewLayoutPosition(); 3083 int rowIndex = mGrid.getRowIndex(position); 3084 int guessSpanIndex = position / mGrid.getNumRows(); 3085 if (mOrientation == HORIZONTAL) { 3086 info.setCollectionItemInfo(AccessibilityNodeInfoCompat.CollectionItemInfoCompat.obtain( 3087 rowIndex, 1, guessSpanIndex, 1, false, false)); 3088 } else { 3089 info.setCollectionItemInfo(AccessibilityNodeInfoCompat.CollectionItemInfoCompat.obtain( 3090 guessSpanIndex, 1, rowIndex, 1, false, false)); 3091 } 3092 } 3093 3094 /* 3095 * Leanback widget is different than the default implementation because the "scroll" is driven 3096 * by selection change. 3097 */ 3098 @Override 3099 public boolean performAccessibilityAction(Recycler recycler, State state, int action, 3100 Bundle args) { 3101 saveContext(recycler, state); 3102 switch (action) { 3103 case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: 3104 // try to focus all the way to the last visible item on the same row. 3105 processSelectionMoves(false, -mState.getItemCount()); 3106 break; 3107 case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: 3108 processSelectionMoves(false, mState.getItemCount()); 3109 break; 3110 } 3111 leaveContext(); 3112 return true; 3113 } 3114 3115 /* 3116 * Move mFocusPosition multiple steps on the same row in main direction. 3117 * Stops when moves are all consumed or reach first/last visible item. 3118 * Returning remaining moves. 3119 */ 3120 private int processSelectionMoves(boolean preventScroll, int moves) { 3121 if (mGrid == null) { 3122 return moves; 3123 } 3124 int focusPosition = mFocusPosition; 3125 int focusedRow = focusPosition != NO_POSITION ? 3126 mGrid.getRowIndex(focusPosition) : NO_POSITION; 3127 View newSelected = null; 3128 for (int i = 0, count = getChildCount(); i < count && moves != 0; i++) { 3129 int index = moves > 0 ? i : count - 1 - i; 3130 final View child = getChildAt(index); 3131 if (!canScrollTo(child)) { 3132 continue; 3133 } 3134 int position = getPositionByIndex(index); 3135 int rowIndex = mGrid.getRowIndex(position); 3136 if (focusedRow == NO_POSITION) { 3137 focusPosition = position; 3138 newSelected = child; 3139 focusedRow = rowIndex; 3140 } else if (rowIndex == focusedRow) { 3141 if ((moves > 0 && position > focusPosition) 3142 || (moves < 0 && position < focusPosition)) { 3143 focusPosition = position; 3144 newSelected = child; 3145 if (moves > 0) { 3146 moves--; 3147 } else { 3148 moves++; 3149 } 3150 } 3151 } 3152 } 3153 if (newSelected != null) { 3154 if (preventScroll) { 3155 if (hasFocus()) { 3156 mInSelection = true; 3157 newSelected.requestFocus(); 3158 mInSelection = false; 3159 } 3160 mFocusPosition = focusPosition; 3161 mSubFocusPosition = 0; 3162 } else { 3163 scrollToView(newSelected, true); 3164 } 3165 } 3166 return moves; 3167 } 3168 3169 @Override 3170 public void onInitializeAccessibilityNodeInfo(Recycler recycler, State state, 3171 AccessibilityNodeInfoCompat info) { 3172 saveContext(recycler, state); 3173 if (mScrollEnabled && !hasCreatedFirstItem()) { 3174 info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); 3175 info.setScrollable(true); 3176 } 3177 if (mScrollEnabled && !hasCreatedLastItem()) { 3178 info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); 3179 info.setScrollable(true); 3180 } 3181 final AccessibilityNodeInfoCompat.CollectionInfoCompat collectionInfo 3182 = AccessibilityNodeInfoCompat.CollectionInfoCompat 3183 .obtain(getRowCountForAccessibility(recycler, state), 3184 getColumnCountForAccessibility(recycler, state), 3185 isLayoutHierarchical(recycler, state), 3186 getSelectionModeForAccessibility(recycler, state)); 3187 info.setCollectionInfo(collectionInfo); 3188 leaveContext(); 3189 } 3190} 3191