GridLayoutManager.java revision 5509e275a04396bfb16b3a217c5392a864398174
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 int calculateTimeForScrolling(int dx) { 250 int ms = super.calculateTimeForScrolling(dx); 251 if (mWindowAlignment.mainAxis().getSize() > 0) { 252 float minMs = (float) MIN_MS_SMOOTH_SCROLL_MAIN_SCREEN / 253 mWindowAlignment.mainAxis().getSize() * dx; 254 if (ms < minMs) { 255 ms = (int) minMs; 256 } 257 } 258 return ms; 259 } 260 261 @Override 262 protected void onTargetFound(View targetView, 263 RecyclerView.State state, Action action) { 264 if (getScrollPosition(targetView, null, sTwoInts)) { 265 int dx, dy; 266 if (mOrientation == HORIZONTAL) { 267 dx = sTwoInts[0]; 268 dy = sTwoInts[1]; 269 } else { 270 dx = sTwoInts[1]; 271 dy = sTwoInts[0]; 272 } 273 final int distance = (int) Math.sqrt(dx * dx + dy * dy); 274 final int time = calculateTimeForDeceleration(distance); 275 action.update(dx, dy, time, mDecelerateInterpolator); 276 } 277 } 278 } 279 280 /** 281 * The SmoothScroller that remembers pending DPAD keys and consume pending keys 282 * during scroll. 283 */ 284 final class PendingMoveSmoothScroller extends GridLinearSmoothScroller { 285 // -2 is a target position that LinearSmoothScroller can never find until 286 // consumePendingMovesXXX() sets real targetPosition. 287 final static int TARGET_UNDEFINED = -2; 288 // whether the grid is staggered. 289 private final boolean mStaggeredGrid; 290 // Number of pending movements on primary direction, negative if PREV_ITEM. 291 private int mPendingMoves; 292 293 PendingMoveSmoothScroller(int initialPendingMoves, boolean staggeredGrid) { 294 mPendingMoves = initialPendingMoves; 295 mStaggeredGrid = staggeredGrid; 296 setTargetPosition(TARGET_UNDEFINED); 297 } 298 299 void increasePendingMoves() { 300 if (mPendingMoves < MAX_PENDING_MOVES) { 301 mPendingMoves++; 302 } 303 } 304 305 void decreasePendingMoves() { 306 if (mPendingMoves > -MAX_PENDING_MOVES) { 307 mPendingMoves--; 308 } 309 } 310 311 /** 312 * Called before laid out an item when non-staggered grid can handle pending movements 313 * by skipping "mNumRows" per movement; staggered grid will have to wait the item 314 * has been laid out in consumePendingMovesAfterLayout(). 315 */ 316 void consumePendingMovesBeforeLayout() { 317 if (mStaggeredGrid || mPendingMoves == 0) { 318 return; 319 } 320 View newSelected = null; 321 int startPos = mPendingMoves > 0 ? mFocusPosition + mNumRows : 322 mFocusPosition - mNumRows; 323 for (int pos = startPos; mPendingMoves != 0; 324 pos = mPendingMoves > 0 ? pos + mNumRows: pos - mNumRows) { 325 View v = findViewByPosition(pos); 326 if (v == null) { 327 break; 328 } 329 if (!canScrollTo(v)) { 330 continue; 331 } 332 newSelected = v; 333 mFocusPosition = pos; 334 mSubFocusPosition = 0; 335 if (mPendingMoves > 0) { 336 mPendingMoves--; 337 } else { 338 mPendingMoves++; 339 } 340 } 341 if (newSelected != null && hasFocus()) { 342 mInSelection = true; 343 newSelected.requestFocus(); 344 mInSelection = false; 345 } 346 } 347 348 /** 349 * Called after laid out an item. Staggered grid should find view on same 350 * Row and consume pending movements. 351 */ 352 void consumePendingMovesAfterLayout() { 353 if (mStaggeredGrid && mPendingMoves != 0) { 354 // consume pending moves, focus to item on the same row. 355 mPendingMoves = processSelectionMoves(true, mPendingMoves); 356 } 357 if (mPendingMoves == 0 || (mPendingMoves > 0 && hasCreatedLastItem()) 358 || (mPendingMoves < 0 && hasCreatedFirstItem())) { 359 setTargetPosition(mFocusPosition); 360 stop(); 361 } 362 } 363 364 @Override 365 protected void updateActionForInterimTarget(Action action) { 366 if (mPendingMoves == 0) { 367 return; 368 } 369 super.updateActionForInterimTarget(action); 370 } 371 372 @Override 373 public PointF computeScrollVectorForPosition(int targetPosition) { 374 if (mPendingMoves == 0) { 375 return null; 376 } 377 int direction = (mReverseFlowPrimary ? mPendingMoves > 0 : mPendingMoves < 0) ? 378 -1 : 1; 379 if (mOrientation == HORIZONTAL) { 380 return new PointF(direction, 0); 381 } else { 382 return new PointF(0, direction); 383 } 384 } 385 386 @Override 387 protected void onStop() { 388 super.onStop(); 389 // if we hit wall, need clear the remaining pending moves. 390 mPendingMoves = 0; 391 mPendingMoveSmoothScroller = null; 392 View v = findViewByPosition(getTargetPosition()); 393 if (v != null) scrollToView(v, true); 394 } 395 }; 396 397 private static final String TAG = "GridLayoutManager"; 398 private static final boolean DEBUG = false; 399 private static final boolean TRACE = false; 400 401 // maximum pending movement in one direction. 402 private final static int MAX_PENDING_MOVES = 10; 403 // minimal milliseconds to scroll window size in major direction, we put a cap to prevent the 404 // effect smooth scrolling too over to bind an item view then drag the item view back. 405 private final static int MIN_MS_SMOOTH_SCROLL_MAIN_SCREEN = 30; 406 407 private String getTag() { 408 return TAG + ":" + mBaseGridView.getId(); 409 } 410 411 private final BaseGridView mBaseGridView; 412 413 /** 414 * Note on conventions in the presence of RTL layout directions: 415 * Many properties and method names reference entities related to the 416 * beginnings and ends of things. In the presence of RTL flows, 417 * it may not be clear whether this is intended to reference a 418 * quantity that changes direction in RTL cases, or a quantity that 419 * does not. Here are the conventions in use: 420 * 421 * start/end: coordinate quantities - do reverse 422 * (optical) left/right: coordinate quantities - do not reverse 423 * low/high: coordinate quantities - do not reverse 424 * min/max: coordinate quantities - do not reverse 425 * scroll offset - coordinate quantities - do not reverse 426 * first/last: positional indices - do not reverse 427 * front/end: positional indices - do not reverse 428 * prepend/append: related to positional indices - do not reverse 429 * 430 * Note that although quantities do not reverse in RTL flows, their 431 * relationship does. In LTR flows, the first positional index is 432 * leftmost; in RTL flows, it is rightmost. Thus, anywhere that 433 * positional quantities are mapped onto coordinate quantities, 434 * the flow must be checked and the logic reversed. 435 */ 436 437 /** 438 * The orientation of a "row". 439 */ 440 private int mOrientation = HORIZONTAL; 441 442 private RecyclerView.State mState; 443 private RecyclerView.Recycler mRecycler; 444 445 private static final Rect sTempRect = new Rect(); 446 447 private boolean mInLayout; 448 private boolean mInScroll; 449 private boolean mInFastRelayout; 450 /** 451 * During full layout pass, when GridView had focus: onLayoutChildren will 452 * skip non-focusable child and adjust mFocusPosition. 453 */ 454 private boolean mInLayoutSearchFocus; 455 private boolean mInSelection = false; 456 457 private OnChildSelectedListener mChildSelectedListener = null; 458 459 private ArrayList<OnChildViewHolderSelectedListener> mChildViewHolderSelectedListeners = null; 460 461 private OnChildLaidOutListener mChildLaidOutListener = null; 462 463 /** 464 * The focused position, it's not the currently visually aligned position 465 * but it is the final position that we intend to focus on. If there are 466 * multiple setSelection() called, mFocusPosition saves last value. 467 */ 468 private int mFocusPosition = NO_POSITION; 469 470 /** 471 * A view can have mutliple alignment position, this is the index of which 472 * alignment is used, by default is 0. 473 */ 474 private int mSubFocusPosition = 0; 475 476 /** 477 * LinearSmoothScroller that consume pending DPAD movements. 478 */ 479 private PendingMoveSmoothScroller mPendingMoveSmoothScroller; 480 481 /** 482 * The offset to be applied to mFocusPosition, due to adapter change, on the next 483 * layout. Set to Integer.MIN_VALUE means we should stop adding delta to mFocusPosition 484 * until next layout cycler. 485 * TODO: This is somewhat duplication of RecyclerView getOldPosition() which is 486 * unfortunately cleared after prelayout. 487 */ 488 private int mFocusPositionOffset = 0; 489 490 /** 491 * Extra pixels applied on primary direction. 492 */ 493 private int mPrimaryScrollExtra; 494 495 /** 496 * Force a full layout under certain situations. E.g. Rows change, jump to invisible child. 497 */ 498 private boolean mForceFullLayout; 499 500 /** 501 * True if layout is enabled. 502 */ 503 private boolean mLayoutEnabled = true; 504 505 /** 506 * override child visibility 507 */ 508 private int mChildVisibility = -1; 509 510 /** 511 * The scroll offsets of the viewport relative to the entire view. 512 */ 513 private int mScrollOffsetPrimary; 514 private int mScrollOffsetSecondary; 515 516 /** 517 * User-specified row height/column width. Can be WRAP_CONTENT. 518 */ 519 private int mRowSizeSecondaryRequested; 520 521 /** 522 * The fixed size of each grid item in the secondary direction. This corresponds to 523 * the row height, equal for all rows. Grid items may have variable length 524 * in the primary direction. 525 */ 526 private int mFixedRowSizeSecondary; 527 528 /** 529 * Tracks the secondary size of each row. 530 */ 531 private int[] mRowSizeSecondary; 532 533 /** 534 * Flag controlling whether the current/next layout should 535 * be updating the secondary size of rows. 536 */ 537 private boolean mRowSecondarySizeRefresh; 538 539 /** 540 * The maximum measured size of the view. 541 */ 542 private int mMaxSizeSecondary; 543 544 /** 545 * Margin between items. 546 */ 547 private int mHorizontalMargin; 548 /** 549 * Margin between items vertically. 550 */ 551 private int mVerticalMargin; 552 /** 553 * Margin in main direction. 554 */ 555 private int mMarginPrimary; 556 /** 557 * Margin in second direction. 558 */ 559 private int mMarginSecondary; 560 /** 561 * How to position child in secondary direction. 562 */ 563 private int mGravity = Gravity.START | Gravity.TOP; 564 /** 565 * The number of rows in the grid. 566 */ 567 private int mNumRows; 568 /** 569 * Number of rows requested, can be 0 to be determined by parent size and 570 * rowHeight. 571 */ 572 private int mNumRowsRequested = 1; 573 574 /** 575 * Saves grid information of each view. 576 */ 577 Grid mGrid; 578 579 /** 580 * Focus Scroll strategy. 581 */ 582 private int mFocusScrollStrategy = BaseGridView.FOCUS_SCROLL_ALIGNED; 583 /** 584 * Defines how item view is aligned in the window. 585 */ 586 private final WindowAlignment mWindowAlignment = new WindowAlignment(); 587 588 /** 589 * Defines how item view is aligned. 590 */ 591 private final ItemAlignment mItemAlignment = new ItemAlignment(); 592 593 /** 594 * Dimensions of the view, width or height depending on orientation. 595 */ 596 private int mSizePrimary; 597 598 /** 599 * Pixels of extra space for layout item (outside the widget) 600 */ 601 private int mExtraLayoutSpace; 602 603 /** 604 * Allow DPAD key to navigate out at the front of the View (where position = 0), 605 * default is false. 606 */ 607 private boolean mFocusOutFront; 608 609 /** 610 * Allow DPAD key to navigate out at the end of the view, default is false. 611 */ 612 private boolean mFocusOutEnd; 613 614 /** 615 * Allow DPAD key to navigate out of second axis. 616 * default is true. 617 */ 618 private boolean mFocusOutSideStart = true; 619 620 /** 621 * Allow DPAD key to navigate out of second axis. 622 */ 623 private boolean mFocusOutSideEnd = true; 624 625 /** 626 * True if focus search is disabled. 627 */ 628 private boolean mFocusSearchDisabled; 629 630 /** 631 * True if prune child, might be disabled during transition. 632 */ 633 private boolean mPruneChild = true; 634 635 /** 636 * True if scroll content, might be disabled during transition. 637 */ 638 private boolean mScrollEnabled = true; 639 640 /** 641 * Temporary variable: an int array of length=2. 642 */ 643 private static int[] sTwoInts = new int[2]; 644 645 /** 646 * Set to true for RTL layout in horizontal orientation 647 */ 648 private boolean mReverseFlowPrimary = false; 649 650 /** 651 * Set to true for RTL layout in vertical orientation 652 */ 653 private boolean mReverseFlowSecondary = false; 654 655 /** 656 * Temporaries used for measuring. 657 */ 658 private int[] mMeasuredDimension = new int[2]; 659 660 final ViewsStateBundle mChildrenStates = new ViewsStateBundle(); 661 662 /** 663 * Optional interface implemented by Adapter. 664 */ 665 private FacetProviderAdapter mFacetProviderAdapter; 666 667 public GridLayoutManager(BaseGridView baseGridView) { 668 mBaseGridView = baseGridView; 669 } 670 671 public void setOrientation(int orientation) { 672 if (orientation != HORIZONTAL && orientation != VERTICAL) { 673 if (DEBUG) Log.v(getTag(), "invalid orientation: " + orientation); 674 return; 675 } 676 677 mOrientation = orientation; 678 mWindowAlignment.setOrientation(orientation); 679 mItemAlignment.setOrientation(orientation); 680 mForceFullLayout = true; 681 } 682 683 public void onRtlPropertiesChanged(int layoutDirection) { 684 if (mOrientation == HORIZONTAL) { 685 mReverseFlowPrimary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 686 mReverseFlowSecondary = false; 687 } else { 688 mReverseFlowSecondary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 689 mReverseFlowPrimary = false; 690 } 691 mWindowAlignment.horizontal.setReversedFlow(layoutDirection == View.LAYOUT_DIRECTION_RTL); 692 } 693 694 public int getFocusScrollStrategy() { 695 return mFocusScrollStrategy; 696 } 697 698 public void setFocusScrollStrategy(int focusScrollStrategy) { 699 mFocusScrollStrategy = focusScrollStrategy; 700 } 701 702 public void setWindowAlignment(int windowAlignment) { 703 mWindowAlignment.mainAxis().setWindowAlignment(windowAlignment); 704 } 705 706 public int getWindowAlignment() { 707 return mWindowAlignment.mainAxis().getWindowAlignment(); 708 } 709 710 public void setWindowAlignmentOffset(int alignmentOffset) { 711 mWindowAlignment.mainAxis().setWindowAlignmentOffset(alignmentOffset); 712 } 713 714 public int getWindowAlignmentOffset() { 715 return mWindowAlignment.mainAxis().getWindowAlignmentOffset(); 716 } 717 718 public void setWindowAlignmentOffsetPercent(float offsetPercent) { 719 mWindowAlignment.mainAxis().setWindowAlignmentOffsetPercent(offsetPercent); 720 } 721 722 public float getWindowAlignmentOffsetPercent() { 723 return mWindowAlignment.mainAxis().getWindowAlignmentOffsetPercent(); 724 } 725 726 public void setItemAlignmentOffset(int alignmentOffset) { 727 mItemAlignment.mainAxis().setItemAlignmentOffset(alignmentOffset); 728 updateChildAlignments(); 729 } 730 731 public int getItemAlignmentOffset() { 732 return mItemAlignment.mainAxis().getItemAlignmentOffset(); 733 } 734 735 public void setItemAlignmentOffsetWithPadding(boolean withPadding) { 736 mItemAlignment.mainAxis().setItemAlignmentOffsetWithPadding(withPadding); 737 updateChildAlignments(); 738 } 739 740 public boolean isItemAlignmentOffsetWithPadding() { 741 return mItemAlignment.mainAxis().isItemAlignmentOffsetWithPadding(); 742 } 743 744 public void setItemAlignmentOffsetPercent(float offsetPercent) { 745 mItemAlignment.mainAxis().setItemAlignmentOffsetPercent(offsetPercent); 746 updateChildAlignments(); 747 } 748 749 public float getItemAlignmentOffsetPercent() { 750 return mItemAlignment.mainAxis().getItemAlignmentOffsetPercent(); 751 } 752 753 public void setItemAlignmentViewId(int viewId) { 754 mItemAlignment.mainAxis().setItemAlignmentViewId(viewId); 755 updateChildAlignments(); 756 } 757 758 public int getItemAlignmentViewId() { 759 return mItemAlignment.mainAxis().getItemAlignmentViewId(); 760 } 761 762 public void setFocusOutAllowed(boolean throughFront, boolean throughEnd) { 763 mFocusOutFront = throughFront; 764 mFocusOutEnd = throughEnd; 765 } 766 767 public void setFocusOutSideAllowed(boolean throughStart, boolean throughEnd) { 768 mFocusOutSideStart = throughStart; 769 mFocusOutSideEnd = throughEnd; 770 } 771 772 public void setNumRows(int numRows) { 773 if (numRows < 0) throw new IllegalArgumentException(); 774 mNumRowsRequested = numRows; 775 } 776 777 /** 778 * Set the row height. May be WRAP_CONTENT, or a size in pixels. 779 */ 780 public void setRowHeight(int height) { 781 if (height >= 0 || height == ViewGroup.LayoutParams.WRAP_CONTENT) { 782 mRowSizeSecondaryRequested = height; 783 } else { 784 throw new IllegalArgumentException("Invalid row height: " + height); 785 } 786 } 787 788 public void setItemMargin(int margin) { 789 mVerticalMargin = mHorizontalMargin = margin; 790 mMarginPrimary = mMarginSecondary = margin; 791 } 792 793 public void setVerticalMargin(int margin) { 794 if (mOrientation == HORIZONTAL) { 795 mMarginSecondary = mVerticalMargin = margin; 796 } else { 797 mMarginPrimary = mVerticalMargin = margin; 798 } 799 } 800 801 public void setHorizontalMargin(int margin) { 802 if (mOrientation == HORIZONTAL) { 803 mMarginPrimary = mHorizontalMargin = margin; 804 } else { 805 mMarginSecondary = mHorizontalMargin = margin; 806 } 807 } 808 809 public int getVerticalMargin() { 810 return mVerticalMargin; 811 } 812 813 public int getHorizontalMargin() { 814 return mHorizontalMargin; 815 } 816 817 public void setGravity(int gravity) { 818 mGravity = gravity; 819 } 820 821 protected boolean hasDoneFirstLayout() { 822 return mGrid != null; 823 } 824 825 public void setOnChildSelectedListener(OnChildSelectedListener listener) { 826 mChildSelectedListener = listener; 827 } 828 829 public void setOnChildViewHolderSelectedListener(OnChildViewHolderSelectedListener listener) { 830 if (listener == null) { 831 mChildViewHolderSelectedListeners = null; 832 return; 833 } 834 if (mChildViewHolderSelectedListeners == null) { 835 mChildViewHolderSelectedListeners = new ArrayList<OnChildViewHolderSelectedListener>(); 836 } else { 837 mChildViewHolderSelectedListeners.clear(); 838 } 839 mChildViewHolderSelectedListeners.add(listener); 840 } 841 842 public void addOnChildViewHolderSelectedListener(OnChildViewHolderSelectedListener listener) { 843 if (mChildViewHolderSelectedListeners == null) { 844 mChildViewHolderSelectedListeners = new ArrayList<OnChildViewHolderSelectedListener>(); 845 } 846 mChildViewHolderSelectedListeners.add(listener); 847 } 848 849 public void removeOnChildViewHolderSelectedListener(OnChildViewHolderSelectedListener 850 listener) { 851 if (mChildViewHolderSelectedListeners != null) { 852 mChildViewHolderSelectedListeners.remove(listener); 853 } 854 } 855 856 boolean hasOnChildViewHolderSelectedListener() { 857 return mChildViewHolderSelectedListeners != null && 858 mChildViewHolderSelectedListeners.size() > 0; 859 } 860 861 void fireOnChildViewHolderSelected(RecyclerView parent, RecyclerView.ViewHolder child, 862 int position, int subposition) { 863 if (mChildViewHolderSelectedListeners == null) { 864 return; 865 } 866 for (int i = mChildViewHolderSelectedListeners.size() - 1; i >= 0 ; i--) { 867 mChildViewHolderSelectedListeners.get(i).onChildViewHolderSelected(parent, child, 868 position, subposition); 869 } 870 } 871 872 void setOnChildLaidOutListener(OnChildLaidOutListener listener) { 873 mChildLaidOutListener = listener; 874 } 875 876 private int getPositionByView(View view) { 877 if (view == null) { 878 return NO_POSITION; 879 } 880 LayoutParams params = (LayoutParams) view.getLayoutParams(); 881 if (params == null || params.isItemRemoved()) { 882 // when item is removed, the position value can be any value. 883 return NO_POSITION; 884 } 885 return params.getViewPosition(); 886 } 887 888 private int getSubPositionByView(View view, View childView) { 889 if (view == null || childView == null) { 890 return 0; 891 } 892 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 893 final ItemAlignmentFacet facet = lp.getItemAlignmentFacet(); 894 if (facet != null) { 895 final ItemAlignmentFacet.ItemAlignmentDef[] defs = facet.getAlignmentDefs(); 896 if (defs.length > 1) { 897 while (childView != view) { 898 int id = childView.getId(); 899 if (id != View.NO_ID) { 900 for (int i = 1; i < defs.length; i++) { 901 if (defs[i].getItemAlignmentFocusViewId() == id) { 902 return i; 903 } 904 } 905 } 906 childView = (View) childView.getParent(); 907 } 908 } 909 } 910 return 0; 911 } 912 913 private int getPositionByIndex(int index) { 914 return getPositionByView(getChildAt(index)); 915 } 916 917 private void dispatchChildSelected() { 918 if (mChildSelectedListener == null && !hasOnChildViewHolderSelectedListener()) { 919 return; 920 } 921 922 if (TRACE) TraceHelper.beginSection("onChildSelected"); 923 View view = mFocusPosition == NO_POSITION ? null : findViewByPosition(mFocusPosition); 924 if (view != null) { 925 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(view); 926 if (mChildSelectedListener != null) { 927 mChildSelectedListener.onChildSelected(mBaseGridView, view, mFocusPosition, 928 vh == null? NO_ID: vh.getItemId()); 929 } 930 fireOnChildViewHolderSelected(mBaseGridView, vh, mFocusPosition, mSubFocusPosition); 931 } else { 932 if (mChildSelectedListener != null) { 933 mChildSelectedListener.onChildSelected(mBaseGridView, null, NO_POSITION, NO_ID); 934 } 935 fireOnChildViewHolderSelected(mBaseGridView, null, NO_POSITION, 0); 936 } 937 if (TRACE) TraceHelper.endSection(); 938 939 // Children may request layout when a child selection event occurs (such as a change of 940 // padding on the current and previously selected rows). 941 // If in layout, a child requesting layout may have been laid out before the selection 942 // callback. 943 // If it was not, the child will be laid out after the selection callback. 944 // If so, the layout request will be honoured though the view system will emit a double- 945 // layout warning. 946 // If not in layout, we may be scrolling in which case the child layout request will be 947 // eaten by recyclerview. Post a requestLayout. 948 if (!mInLayout && !mBaseGridView.isLayoutRequested()) { 949 int childCount = getChildCount(); 950 for (int i = 0; i < childCount; i++) { 951 if (getChildAt(i).isLayoutRequested()) { 952 forceRequestLayout(); 953 break; 954 } 955 } 956 } 957 } 958 959 @Override 960 public boolean canScrollHorizontally() { 961 // We can scroll horizontally if we have horizontal orientation, or if 962 // we are vertical and have more than one column. 963 return mOrientation == HORIZONTAL || mNumRows > 1; 964 } 965 966 @Override 967 public boolean canScrollVertically() { 968 // We can scroll vertically if we have vertical orientation, or if we 969 // are horizontal and have more than one row. 970 return mOrientation == VERTICAL || mNumRows > 1; 971 } 972 973 @Override 974 public RecyclerView.LayoutParams generateDefaultLayoutParams() { 975 return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 976 ViewGroup.LayoutParams.WRAP_CONTENT); 977 } 978 979 @Override 980 public RecyclerView.LayoutParams generateLayoutParams(Context context, AttributeSet attrs) { 981 return new LayoutParams(context, attrs); 982 } 983 984 @Override 985 public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { 986 if (lp instanceof LayoutParams) { 987 return new LayoutParams((LayoutParams) lp); 988 } else if (lp instanceof RecyclerView.LayoutParams) { 989 return new LayoutParams((RecyclerView.LayoutParams) lp); 990 } else if (lp instanceof MarginLayoutParams) { 991 return new LayoutParams((MarginLayoutParams) lp); 992 } else { 993 return new LayoutParams(lp); 994 } 995 } 996 997 protected View getViewForPosition(int position) { 998 return mRecycler.getViewForPosition(position); 999 } 1000 1001 final int getOpticalLeft(View v) { 1002 return ((LayoutParams) v.getLayoutParams()).getOpticalLeft(v); 1003 } 1004 1005 final int getOpticalRight(View v) { 1006 return ((LayoutParams) v.getLayoutParams()).getOpticalRight(v); 1007 } 1008 1009 final int getOpticalTop(View v) { 1010 return ((LayoutParams) v.getLayoutParams()).getOpticalTop(v); 1011 } 1012 1013 final int getOpticalBottom(View v) { 1014 return ((LayoutParams) v.getLayoutParams()).getOpticalBottom(v); 1015 } 1016 1017 private int getViewMin(View v) { 1018 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1019 return (mOrientation == HORIZONTAL) ? lp.getDecoratedOpticalLeftWithMargin(this, v) 1020 : lp.getDecoratedOpticalTopWithMargin(this, v); 1021 } 1022 1023 private int getViewMax(View v) { 1024 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1025 return (mOrientation == HORIZONTAL) ? lp.getDecoratedOpticalRightWithMargin(this, v) 1026 : lp.getDecoratedOpticalBottomWithMargin(this, v); 1027 } 1028 1029 private int getViewPrimarySize(View view) { 1030 LayoutParams p = (LayoutParams) view.getLayoutParams(); 1031 return mOrientation == HORIZONTAL ? p.getDecoratedOpticalWidthWithMargin(this, view) 1032 : p.getDecoratedOpticalHeightWithMargin(this, view); 1033 } 1034 1035 private int getViewCenter(View view) { 1036 return (mOrientation == HORIZONTAL) ? getViewCenterX(view) : getViewCenterY(view); 1037 } 1038 1039 private int getViewCenterSecondary(View view) { 1040 return (mOrientation == HORIZONTAL) ? getViewCenterY(view) : getViewCenterX(view); 1041 } 1042 1043 private int getViewCenterX(View v) { 1044 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1045 return p.getOpticalLeft(v) + p.getAlignX(); 1046 } 1047 1048 private int getViewCenterY(View v) { 1049 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1050 return p.getOpticalTop(v) + p.getAlignY(); 1051 } 1052 1053 /** 1054 * Save Recycler and State for convenience. Must be paired with leaveContext(). 1055 */ 1056 private void saveContext(Recycler recycler, State state) { 1057 if (mRecycler != null || mState != null) { 1058 Log.e(TAG, "Recycler information was not released, bug!"); 1059 } 1060 mRecycler = recycler; 1061 mState = state; 1062 } 1063 1064 /** 1065 * Discard saved Recycler and State. 1066 */ 1067 private void leaveContext() { 1068 mRecycler = null; 1069 mState = null; 1070 } 1071 1072 /** 1073 * Re-initialize data structures for a data change or handling invisible 1074 * selection. The method tries its best to preserve position information so 1075 * that staggered grid looks same before and after re-initialize. 1076 * @return true if can fastRelayout() 1077 */ 1078 private boolean layoutInit() { 1079 boolean focusViewWasInTree = mGrid != null && mFocusPosition >= 0 1080 && mFocusPosition >= mGrid.getFirstVisibleIndex() 1081 && mFocusPosition <= mGrid.getLastVisibleIndex(); 1082 final int newItemCount = mState.getItemCount(); 1083 if (newItemCount == 0) { 1084 mFocusPosition = NO_POSITION; 1085 mSubFocusPosition = 0; 1086 } else if (mFocusPosition >= newItemCount) { 1087 mFocusPosition = newItemCount - 1; 1088 mSubFocusPosition = 0; 1089 } else if (mFocusPosition == NO_POSITION && newItemCount > 0) { 1090 // if focus position is never set before, initialize it to 0 1091 mFocusPosition = 0; 1092 mSubFocusPosition = 0; 1093 } 1094 if (!mState.didStructureChange() && mGrid.getFirstVisibleIndex() >= 0 && 1095 !mForceFullLayout && mGrid != null && mGrid.getNumRows() == mNumRows) { 1096 updateScrollController(); 1097 updateScrollSecondAxis(); 1098 mGrid.setMargin(mMarginPrimary); 1099 if (!focusViewWasInTree && mFocusPosition != NO_POSITION) { 1100 mGrid.setStart(mFocusPosition); 1101 } 1102 return true; 1103 } else { 1104 mForceFullLayout = false; 1105 int firstVisibleIndex = focusViewWasInTree ? mGrid.getFirstVisibleIndex() : 0; 1106 1107 if (mGrid == null || mNumRows != mGrid.getNumRows() || 1108 mReverseFlowPrimary != mGrid.isReversedFlow()) { 1109 mGrid = Grid.createGrid(mNumRows); 1110 mGrid.setProvider(mGridProvider); 1111 mGrid.setReversedFlow(mReverseFlowPrimary); 1112 } 1113 initScrollController(); 1114 updateScrollSecondAxis(); 1115 mGrid.setMargin(mMarginPrimary); 1116 detachAndScrapAttachedViews(mRecycler); 1117 mGrid.resetVisibleIndex(); 1118 if (mFocusPosition == NO_POSITION) { 1119 mBaseGridView.clearFocus(); 1120 } 1121 mWindowAlignment.mainAxis().invalidateScrollMin(); 1122 mWindowAlignment.mainAxis().invalidateScrollMax(); 1123 if (focusViewWasInTree && firstVisibleIndex <= mFocusPosition) { 1124 // if focusView was in tree, we will add item from first visible item 1125 mGrid.setStart(firstVisibleIndex); 1126 } else { 1127 // if focusView was not in tree, it's probably because focus position jumped 1128 // far away from visible range, so use mFocusPosition as start 1129 mGrid.setStart(mFocusPosition); 1130 } 1131 return false; 1132 } 1133 } 1134 1135 private int getRowSizeSecondary(int rowIndex) { 1136 if (mFixedRowSizeSecondary != 0) { 1137 return mFixedRowSizeSecondary; 1138 } 1139 if (mRowSizeSecondary == null) { 1140 return 0; 1141 } 1142 return mRowSizeSecondary[rowIndex]; 1143 } 1144 1145 private int getRowStartSecondary(int rowIndex) { 1146 int start = 0; 1147 // Iterate from left to right, which is a different index traversal 1148 // in RTL flow 1149 if (mReverseFlowSecondary) { 1150 for (int i = mNumRows-1; i > rowIndex; i--) { 1151 start += getRowSizeSecondary(i) + mMarginSecondary; 1152 } 1153 } else { 1154 for (int i = 0; i < rowIndex; i++) { 1155 start += getRowSizeSecondary(i) + mMarginSecondary; 1156 } 1157 } 1158 return start; 1159 } 1160 1161 private int getSizeSecondary() { 1162 int rightmostIndex = mReverseFlowSecondary ? 0 : mNumRows - 1; 1163 return getRowStartSecondary(rightmostIndex) + getRowSizeSecondary(rightmostIndex); 1164 } 1165 1166 int getDecoratedMeasuredWidthWithMargin(View v) { 1167 final LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1168 return getDecoratedMeasuredWidth(v) + lp.leftMargin + lp.rightMargin; 1169 } 1170 1171 int getDecoratedMeasuredHeightWithMargin(View v) { 1172 final LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1173 return getDecoratedMeasuredHeight(v) + lp.topMargin + lp.bottomMargin; 1174 } 1175 1176 private void measureScrapChild(int position, int widthSpec, int heightSpec, 1177 int[] measuredDimension) { 1178 View view = mRecycler.getViewForPosition(position); 1179 if (view != null) { 1180 final LayoutParams p = (LayoutParams) view.getLayoutParams(); 1181 calculateItemDecorationsForChild(view, sTempRect); 1182 int widthUsed = p.leftMargin + p.rightMargin + sTempRect.left + sTempRect.right; 1183 int heightUsed = p.topMargin + p.bottomMargin + sTempRect.top + sTempRect.bottom; 1184 1185 int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, 1186 getPaddingLeft() + getPaddingRight() + widthUsed, p.width); 1187 int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, 1188 getPaddingTop() + getPaddingBottom() + heightUsed, p.height); 1189 view.measure(childWidthSpec, childHeightSpec); 1190 1191 measuredDimension[0] = getDecoratedMeasuredWidthWithMargin(view); 1192 measuredDimension[1] = getDecoratedMeasuredHeightWithMargin(view); 1193 mRecycler.recycleView(view); 1194 } 1195 } 1196 1197 private boolean processRowSizeSecondary(boolean measure) { 1198 if (mFixedRowSizeSecondary != 0 || mRowSizeSecondary == null) { 1199 return false; 1200 } 1201 1202 if (TRACE) TraceHelper.beginSection("processRowSizeSecondary"); 1203 CircularIntArray[] rows = mGrid == null ? null : mGrid.getItemPositionsInRows(); 1204 boolean changed = false; 1205 int scrapChildWidth = -1; 1206 int scrapChildHeight = -1; 1207 1208 for (int rowIndex = 0; rowIndex < mNumRows; rowIndex++) { 1209 CircularIntArray row = rows == null ? null : rows[rowIndex]; 1210 final int rowItemsPairCount = row == null ? 0 : row.size(); 1211 int rowSize = -1; 1212 for (int rowItemPairIndex = 0; rowItemPairIndex < rowItemsPairCount; 1213 rowItemPairIndex += 2) { 1214 final int rowIndexStart = row.get(rowItemPairIndex); 1215 final int rowIndexEnd = row.get(rowItemPairIndex + 1); 1216 for (int i = rowIndexStart; i <= rowIndexEnd; i++) { 1217 final View view = findViewByPosition(i); 1218 if (view == null) { 1219 continue; 1220 } 1221 if (measure) { 1222 measureChild(view); 1223 } 1224 final int secondarySize = mOrientation == HORIZONTAL ? 1225 getDecoratedMeasuredHeightWithMargin(view) 1226 : getDecoratedMeasuredWidthWithMargin(view); 1227 if (secondarySize > rowSize) { 1228 rowSize = secondarySize; 1229 } 1230 } 1231 } 1232 1233 final int itemCount = mState.getItemCount(); 1234 if (!mBaseGridView.hasFixedSize() && measure && rowSize < 0 && itemCount > 0) { 1235 if (scrapChildWidth < 0 && scrapChildHeight < 0) { 1236 int position; 1237 if (mFocusPosition == NO_POSITION) { 1238 position = 0; 1239 } else if (mFocusPosition >= itemCount) { 1240 position = itemCount - 1; 1241 } else { 1242 position = mFocusPosition; 1243 } 1244 measureScrapChild(position, 1245 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1246 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1247 mMeasuredDimension); 1248 scrapChildWidth = mMeasuredDimension[0]; 1249 scrapChildHeight = mMeasuredDimension[1]; 1250 if (DEBUG) Log.v(TAG, "measured scrap child: " + scrapChildWidth + 1251 " " + scrapChildHeight); 1252 } 1253 rowSize = mOrientation == HORIZONTAL ? scrapChildHeight : scrapChildWidth; 1254 } 1255 if (rowSize < 0) { 1256 rowSize = 0; 1257 } 1258 if (mRowSizeSecondary[rowIndex] != rowSize) { 1259 if (DEBUG) Log.v(getTag(), "row size secondary changed: " + mRowSizeSecondary[rowIndex] + 1260 ", " + rowSize); 1261 mRowSizeSecondary[rowIndex] = rowSize; 1262 changed = true; 1263 } 1264 } 1265 1266 if (TRACE) TraceHelper.endSection(); 1267 return changed; 1268 } 1269 1270 /** 1271 * Checks if we need to update row secondary sizes. 1272 */ 1273 private void updateRowSecondarySizeRefresh() { 1274 mRowSecondarySizeRefresh = processRowSizeSecondary(false); 1275 if (mRowSecondarySizeRefresh) { 1276 if (DEBUG) Log.v(getTag(), "mRowSecondarySizeRefresh now set"); 1277 forceRequestLayout(); 1278 } 1279 } 1280 1281 private void forceRequestLayout() { 1282 if (DEBUG) Log.v(getTag(), "forceRequestLayout"); 1283 // RecyclerView prevents us from requesting layout in many cases 1284 // (during layout, during scroll, etc.) 1285 // For secondary row size wrap_content support we currently need a 1286 // second layout pass to update the measured size after having measured 1287 // and added child views in layoutChildren. 1288 // Force the second layout by posting a delayed runnable. 1289 // TODO: investigate allowing a second layout pass, 1290 // or move child add/measure logic to the measure phase. 1291 ViewCompat.postOnAnimation(mBaseGridView, mRequestLayoutRunnable); 1292 } 1293 1294 private final Runnable mRequestLayoutRunnable = new Runnable() { 1295 @Override 1296 public void run() { 1297 if (DEBUG) Log.v(getTag(), "request Layout from runnable"); 1298 requestLayout(); 1299 } 1300 }; 1301 1302 @Override 1303 public void onMeasure(Recycler recycler, State state, int widthSpec, int heightSpec) { 1304 saveContext(recycler, state); 1305 1306 int sizePrimary, sizeSecondary, modeSecondary, paddingSecondary; 1307 int measuredSizeSecondary; 1308 if (mOrientation == HORIZONTAL) { 1309 sizePrimary = MeasureSpec.getSize(widthSpec); 1310 sizeSecondary = MeasureSpec.getSize(heightSpec); 1311 modeSecondary = MeasureSpec.getMode(heightSpec); 1312 paddingSecondary = getPaddingTop() + getPaddingBottom(); 1313 } else { 1314 sizeSecondary = MeasureSpec.getSize(widthSpec); 1315 sizePrimary = MeasureSpec.getSize(heightSpec); 1316 modeSecondary = MeasureSpec.getMode(widthSpec); 1317 paddingSecondary = getPaddingLeft() + getPaddingRight(); 1318 } 1319 if (DEBUG) Log.v(getTag(), "onMeasure widthSpec " + Integer.toHexString(widthSpec) + 1320 " heightSpec " + Integer.toHexString(heightSpec) + 1321 " modeSecondary " + Integer.toHexString(modeSecondary) + 1322 " sizeSecondary " + sizeSecondary + " " + this); 1323 1324 mMaxSizeSecondary = sizeSecondary; 1325 1326 if (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) { 1327 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1328 mFixedRowSizeSecondary = 0; 1329 1330 if (mRowSizeSecondary == null || mRowSizeSecondary.length != mNumRows) { 1331 mRowSizeSecondary = new int[mNumRows]; 1332 } 1333 1334 // Measure all current children and update cached row heights 1335 processRowSizeSecondary(true); 1336 1337 switch (modeSecondary) { 1338 case MeasureSpec.UNSPECIFIED: 1339 measuredSizeSecondary = getSizeSecondary() + paddingSecondary; 1340 break; 1341 case MeasureSpec.AT_MOST: 1342 measuredSizeSecondary = Math.min(getSizeSecondary() + paddingSecondary, 1343 mMaxSizeSecondary); 1344 break; 1345 case MeasureSpec.EXACTLY: 1346 measuredSizeSecondary = mMaxSizeSecondary; 1347 break; 1348 default: 1349 throw new IllegalStateException("wrong spec"); 1350 } 1351 1352 } else { 1353 switch (modeSecondary) { 1354 case MeasureSpec.UNSPECIFIED: 1355 mFixedRowSizeSecondary = mRowSizeSecondaryRequested == 0 ? 1356 sizeSecondary - paddingSecondary: mRowSizeSecondaryRequested; 1357 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1358 measuredSizeSecondary = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1359 * (mNumRows - 1) + paddingSecondary; 1360 break; 1361 case MeasureSpec.AT_MOST: 1362 case MeasureSpec.EXACTLY: 1363 if (mNumRowsRequested == 0 && mRowSizeSecondaryRequested == 0) { 1364 mNumRows = 1; 1365 mFixedRowSizeSecondary = sizeSecondary - paddingSecondary; 1366 } else if (mNumRowsRequested == 0) { 1367 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1368 mNumRows = (sizeSecondary + mMarginSecondary) 1369 / (mRowSizeSecondaryRequested + mMarginSecondary); 1370 } else if (mRowSizeSecondaryRequested == 0) { 1371 mNumRows = mNumRowsRequested; 1372 mFixedRowSizeSecondary = (sizeSecondary - paddingSecondary - mMarginSecondary 1373 * (mNumRows - 1)) / mNumRows; 1374 } else { 1375 mNumRows = mNumRowsRequested; 1376 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1377 } 1378 measuredSizeSecondary = sizeSecondary; 1379 if (modeSecondary == MeasureSpec.AT_MOST) { 1380 int childrenSize = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1381 * (mNumRows - 1) + paddingSecondary; 1382 if (childrenSize < measuredSizeSecondary) { 1383 measuredSizeSecondary = childrenSize; 1384 } 1385 } 1386 break; 1387 default: 1388 throw new IllegalStateException("wrong spec"); 1389 } 1390 } 1391 if (mOrientation == HORIZONTAL) { 1392 setMeasuredDimension(sizePrimary, measuredSizeSecondary); 1393 } else { 1394 setMeasuredDimension(measuredSizeSecondary, sizePrimary); 1395 } 1396 if (DEBUG) { 1397 Log.v(getTag(), "onMeasure sizePrimary " + sizePrimary + 1398 " measuredSizeSecondary " + measuredSizeSecondary + 1399 " mFixedRowSizeSecondary " + mFixedRowSizeSecondary + 1400 " mNumRows " + mNumRows); 1401 } 1402 leaveContext(); 1403 } 1404 1405 private void measureChild(View child) { 1406 if (TRACE) TraceHelper.beginSection("measureChild"); 1407 final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 1408 calculateItemDecorationsForChild(child, sTempRect); 1409 int widthUsed = lp.leftMargin + lp.rightMargin + sTempRect.left + sTempRect.right; 1410 int heightUsed = lp.topMargin + lp.bottomMargin + sTempRect.top + sTempRect.bottom; 1411 1412 final int secondarySpec = (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) ? 1413 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) : 1414 MeasureSpec.makeMeasureSpec(mFixedRowSizeSecondary, MeasureSpec.EXACTLY); 1415 int widthSpec, heightSpec; 1416 1417 if (mOrientation == HORIZONTAL) { 1418 widthSpec = ViewGroup.getChildMeasureSpec( 1419 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), widthUsed, lp.width); 1420 heightSpec = ViewGroup.getChildMeasureSpec(secondarySpec, heightUsed, lp.height); 1421 } else { 1422 heightSpec = ViewGroup.getChildMeasureSpec( 1423 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed, lp.height); 1424 widthSpec = ViewGroup.getChildMeasureSpec(secondarySpec, widthUsed, lp.width); 1425 } 1426 child.measure(widthSpec, heightSpec); 1427 if (DEBUG) Log.v(getTag(), "measureChild secondarySpec " + Integer.toHexString(secondarySpec) + 1428 " widthSpec " + Integer.toHexString(widthSpec) + 1429 " heightSpec " + Integer.toHexString(heightSpec) + 1430 " measuredWidth " + child.getMeasuredWidth() + 1431 " measuredHeight " + child.getMeasuredHeight()); 1432 if (DEBUG) Log.v(getTag(), "child lp width " + lp.width + " height " + lp.height); 1433 if (TRACE) TraceHelper.endSection(); 1434 } 1435 1436 /** 1437 * Get facet from the ViewHolder or the viewType. 1438 */ 1439 private <E> E getFacet(RecyclerView.ViewHolder vh, Class<? extends E> facetClass) { 1440 E facet = null; 1441 if (vh instanceof FacetProvider) { 1442 facet = (E) ((FacetProvider) vh).getFacet(facetClass); 1443 } 1444 if (facet == null && mFacetProviderAdapter != null) { 1445 FacetProvider p = mFacetProviderAdapter.getFacetProvider(vh.getItemViewType()); 1446 if (p != null) { 1447 facet = (E) p.getFacet(facetClass); 1448 } 1449 } 1450 return facet; 1451 } 1452 1453 private Grid.Provider mGridProvider = new Grid.Provider() { 1454 1455 @Override 1456 public int getCount() { 1457 return mState.getItemCount(); 1458 } 1459 1460 @Override 1461 public int createItem(int index, boolean append, Object[] item) { 1462 if (TRACE) TraceHelper.beginSection("createItem"); 1463 if (TRACE) TraceHelper.beginSection("getview"); 1464 View v = getViewForPosition(index); 1465 if (TRACE) TraceHelper.endSection(); 1466 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1467 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1468 lp.setItemAlignmentFacet((ItemAlignmentFacet)getFacet(vh, ItemAlignmentFacet.class)); 1469 // See recyclerView docs: we don't need re-add scraped view if it was removed. 1470 if (!lp.isItemRemoved()) { 1471 if (TRACE) TraceHelper.beginSection("addView"); 1472 if (append) { 1473 addView(v); 1474 } else { 1475 addView(v, 0); 1476 } 1477 if (TRACE) TraceHelper.endSection(); 1478 if (mChildVisibility != -1) { 1479 v.setVisibility(mChildVisibility); 1480 } 1481 1482 if (mPendingMoveSmoothScroller != null) { 1483 mPendingMoveSmoothScroller.consumePendingMovesBeforeLayout(); 1484 } 1485 int subindex = getSubPositionByView(v, v.findFocus()); 1486 if (!mInLayout) { 1487 // when we are appending item during scroll pass and the item's position 1488 // matches the mFocusPosition, we should signal a childSelected event. 1489 // However if we are still running PendingMoveSmoothScroller, we defer and 1490 // signal the event in PendingMoveSmoothScroller.onStop(). This can 1491 // avoid lots of childSelected events during a long smooth scrolling and 1492 // increase performance. 1493 if (index == mFocusPosition && subindex == mSubFocusPosition 1494 && mPendingMoveSmoothScroller == null) { 1495 dispatchChildSelected(); 1496 } 1497 } else if (!mInFastRelayout) { 1498 // fastRelayout will dispatch event at end of onLayoutChildren(). 1499 // For full layout, two situations here: 1500 // 1. mInLayoutSearchFocus is false, dispatchChildSelected() at mFocusPosition. 1501 // 2. mInLayoutSearchFocus is true: dispatchChildSelected() on first child 1502 // equal to or after mFocusPosition that can take focus. 1503 if (!mInLayoutSearchFocus && index == mFocusPosition 1504 && subindex == mSubFocusPosition) { 1505 dispatchChildSelected(); 1506 } else if (mInLayoutSearchFocus && index >= mFocusPosition 1507 && v.hasFocusable()) { 1508 mFocusPosition = index; 1509 mSubFocusPosition = subindex; 1510 mInLayoutSearchFocus = false; 1511 dispatchChildSelected(); 1512 } 1513 } 1514 measureChild(v); 1515 } 1516 item[0] = v; 1517 return mOrientation == HORIZONTAL ? getDecoratedMeasuredWidthWithMargin(v) 1518 : getDecoratedMeasuredHeightWithMargin(v); 1519 } 1520 1521 @Override 1522 public void addItem(Object item, int index, int length, int rowIndex, int edge) { 1523 View v = (View) item; 1524 int start, end; 1525 if (edge == Integer.MIN_VALUE || edge == Integer.MAX_VALUE) { 1526 edge = !mGrid.isReversedFlow() ? mWindowAlignment.mainAxis().getPaddingLow() 1527 : mWindowAlignment.mainAxis().getSize() 1528 - mWindowAlignment.mainAxis().getPaddingHigh(); 1529 } 1530 boolean edgeIsMin = !mGrid.isReversedFlow(); 1531 if (edgeIsMin) { 1532 start = edge; 1533 end = edge + length; 1534 } else { 1535 start = edge - length; 1536 end = edge; 1537 } 1538 int startSecondary = getRowStartSecondary(rowIndex) - mScrollOffsetSecondary; 1539 mChildrenStates.loadView(v, index); 1540 layoutChild(rowIndex, v, start, end, startSecondary); 1541 if (DEBUG) { 1542 Log.d(getTag(), "addView " + index + " " + v); 1543 } 1544 if (TRACE) TraceHelper.endSection(); 1545 1546 if (index == mGrid.getFirstVisibleIndex()) { 1547 if (!mGrid.isReversedFlow()) { 1548 updateScrollMin(); 1549 } else { 1550 updateScrollMax(); 1551 } 1552 } 1553 if (index == mGrid.getLastVisibleIndex()) { 1554 if (!mGrid.isReversedFlow()) { 1555 updateScrollMax(); 1556 } else { 1557 updateScrollMin(); 1558 } 1559 } 1560 if (!mInLayout && mPendingMoveSmoothScroller != null) { 1561 mPendingMoveSmoothScroller.consumePendingMovesAfterLayout(); 1562 } 1563 if (mChildLaidOutListener != null) { 1564 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1565 mChildLaidOutListener.onChildLaidOut(mBaseGridView, v, index, 1566 vh == null ? NO_ID : vh.getItemId()); 1567 } 1568 } 1569 1570 @Override 1571 public void removeItem(int index) { 1572 if (TRACE) TraceHelper.beginSection("removeItem"); 1573 View v = findViewByPosition(index); 1574 if (mInLayout) { 1575 detachAndScrapView(v, mRecycler); 1576 } else { 1577 removeAndRecycleView(v, mRecycler); 1578 } 1579 if (TRACE) TraceHelper.endSection(); 1580 } 1581 1582 @Override 1583 public int getEdge(int index) { 1584 if (mReverseFlowPrimary) { 1585 return getViewMax(findViewByPosition(index)); 1586 } else { 1587 return getViewMin(findViewByPosition(index)); 1588 } 1589 } 1590 1591 @Override 1592 public int getSize(int index) { 1593 return getViewPrimarySize(findViewByPosition(index)); 1594 } 1595 }; 1596 1597 private void layoutChild(int rowIndex, View v, int start, int end, int startSecondary) { 1598 if (TRACE) TraceHelper.beginSection("layoutChild"); 1599 int sizeSecondary = mOrientation == HORIZONTAL ? getDecoratedMeasuredHeightWithMargin(v) 1600 : getDecoratedMeasuredWidthWithMargin(v); 1601 if (mFixedRowSizeSecondary > 0) { 1602 sizeSecondary = Math.min(sizeSecondary, mFixedRowSizeSecondary); 1603 } 1604 final int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; 1605 final int horizontalGravity = (mReverseFlowPrimary || mReverseFlowSecondary) ? 1606 Gravity.getAbsoluteGravity(mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK, View.LAYOUT_DIRECTION_RTL) : 1607 mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; 1608 if (mOrientation == HORIZONTAL && verticalGravity == Gravity.TOP 1609 || mOrientation == VERTICAL && horizontalGravity == Gravity.LEFT) { 1610 // do nothing 1611 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.BOTTOM 1612 || mOrientation == VERTICAL && horizontalGravity == Gravity.RIGHT) { 1613 startSecondary += getRowSizeSecondary(rowIndex) - sizeSecondary; 1614 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.CENTER_VERTICAL 1615 || mOrientation == VERTICAL && horizontalGravity == Gravity.CENTER_HORIZONTAL) { 1616 startSecondary += (getRowSizeSecondary(rowIndex) - sizeSecondary) / 2; 1617 } 1618 int left, top, right, bottom; 1619 if (mOrientation == HORIZONTAL) { 1620 left = start; 1621 top = startSecondary; 1622 right = end; 1623 bottom = startSecondary + sizeSecondary; 1624 } else { 1625 top = start; 1626 left = startSecondary; 1627 bottom = end; 1628 right = startSecondary + sizeSecondary; 1629 } 1630 LayoutParams params = (LayoutParams) v.getLayoutParams(); 1631 // layoutDecorated() doesn't handle margins, so we need exclude margin: 1632 int decoratedLeftExcludeMargin = left + params.leftMargin; 1633 int decoratedTopExcludeMargin = top + params.topMargin; 1634 int decoratedRightExcludeMargin = right - params.rightMargin; 1635 int decoratedBottomExcludeMargin = bottom - params.bottomMargin; 1636 layoutDecorated(v, decoratedLeftExcludeMargin, decoratedTopExcludeMargin, 1637 decoratedRightExcludeMargin, decoratedBottomExcludeMargin); 1638 // Now v.getLeft() includes the extra space for optical bounds, subtracting it from value 1639 // passed in layoutDecorated(), we can get the optical bounds insets. 1640 params.setOpticalInsets(decoratedLeftExcludeMargin - getDecoratedLeft(v), 1641 decoratedTopExcludeMargin - getDecoratedTop(v), 1642 getDecoratedRight(v) - decoratedRightExcludeMargin, 1643 getDecoratedBottom(v) - decoratedBottomExcludeMargin); 1644 updateChildAlignments(v); 1645 if (TRACE) TraceHelper.endSection(); 1646 } 1647 1648 private void updateChildAlignments(View v) { 1649 final LayoutParams p = (LayoutParams) v.getLayoutParams(); 1650 if (p.getItemAlignmentFacet() == null) { 1651 // Fallback to global settings on grid view 1652 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1653 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1654 } else { 1655 // Use ItemAlignmentFacet defined on specific ViewHolder 1656 p.calculateItemAlignments(mOrientation, v); 1657 if (mOrientation == HORIZONTAL) { 1658 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1659 } else { 1660 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1661 } 1662 } 1663 } 1664 1665 private void updateChildAlignments() { 1666 for (int i = 0, c = getChildCount(); i < c; i++) { 1667 updateChildAlignments(getChildAt(i)); 1668 } 1669 } 1670 1671 void setExtraLayoutSpace(int extraLayoutSpace) { 1672 if (mExtraLayoutSpace == extraLayoutSpace) { 1673 return; 1674 } else if (mExtraLayoutSpace < 0) { 1675 throw new IllegalArgumentException("ExtraLayoutSpace must >= 0"); 1676 } 1677 mExtraLayoutSpace = extraLayoutSpace; 1678 requestLayout(); 1679 } 1680 1681 int getExtraLayoutSpace() { 1682 return mExtraLayoutSpace; 1683 } 1684 1685 private void removeInvisibleViewsAtEnd() { 1686 if (mPruneChild) { 1687 mGrid.removeInvisibleItemsAtEnd(mFocusPosition, 1688 mReverseFlowPrimary ? -mExtraLayoutSpace : mSizePrimary + mExtraLayoutSpace); 1689 } 1690 } 1691 1692 private void removeInvisibleViewsAtFront() { 1693 if (mPruneChild) { 1694 mGrid.removeInvisibleItemsAtFront(mFocusPosition, 1695 mReverseFlowPrimary ? mSizePrimary + mExtraLayoutSpace: -mExtraLayoutSpace); 1696 } 1697 } 1698 1699 private boolean appendOneColumnVisibleItems() { 1700 return mGrid.appendOneColumnVisibleItems(); 1701 } 1702 1703 private boolean prependOneColumnVisibleItems() { 1704 return mGrid.prependOneColumnVisibleItems(); 1705 } 1706 1707 private void appendVisibleItems() { 1708 mGrid.appendVisibleItems(mReverseFlowPrimary ? -mExtraLayoutSpace 1709 : mSizePrimary + mExtraLayoutSpace); 1710 } 1711 1712 private void prependVisibleItems() { 1713 mGrid.prependVisibleItems(mReverseFlowPrimary ? mSizePrimary + mExtraLayoutSpace 1714 : -mExtraLayoutSpace); 1715 } 1716 1717 /** 1718 * Fast layout when there is no structure change, adapter change, etc. 1719 * It will layout all views was layout requested or updated, until hit a view 1720 * with different size, then it break and detachAndScrap all views after that. 1721 */ 1722 private void fastRelayout() { 1723 boolean invalidateAfter = false; 1724 final int childCount = getChildCount(); 1725 int position = -1; 1726 for (int index = 0; index < childCount; index++) { 1727 View view = getChildAt(index); 1728 position = getPositionByIndex(index); 1729 Grid.Location location = mGrid.getLocation(position); 1730 if (location == null) { 1731 if (DEBUG) Log.w(getTag(), "fastRelayout(): no Location at " + position); 1732 invalidateAfter = true; 1733 break; 1734 } 1735 1736 int startSecondary = getRowStartSecondary(location.row) - mScrollOffsetSecondary; 1737 int primarySize, end; 1738 int start = getViewMin(view); 1739 int oldPrimarySize = getViewPrimarySize(view); 1740 1741 LayoutParams lp = (LayoutParams) view.getLayoutParams(); 1742 if (lp.viewNeedsUpdate()) { 1743 int viewIndex = mBaseGridView.indexOfChild(view); 1744 detachAndScrapView(view, mRecycler); 1745 view = getViewForPosition(position); 1746 addView(view, viewIndex); 1747 } 1748 1749 measureChild(view); 1750 if (mOrientation == HORIZONTAL) { 1751 primarySize = getDecoratedMeasuredWidthWithMargin(view); 1752 end = start + primarySize; 1753 } else { 1754 primarySize = getDecoratedMeasuredHeightWithMargin(view); 1755 end = start + primarySize; 1756 } 1757 layoutChild(location.row, view, start, end, startSecondary); 1758 if (oldPrimarySize != primarySize) { 1759 // size changed invalidate remaining Locations 1760 if (DEBUG) Log.d(getTag(), "fastRelayout: view size changed at " + position); 1761 invalidateAfter = true; 1762 break; 1763 } 1764 } 1765 if (invalidateAfter) { 1766 final int savedLastPos = mGrid.getLastVisibleIndex(); 1767 mGrid.invalidateItemsAfter(position); 1768 if (mPruneChild) { 1769 // in regular prune child mode, we just append items up to edge limit 1770 appendVisibleItems(); 1771 if (mFocusPosition >= 0 && mFocusPosition <= savedLastPos) { 1772 // make sure add focus view back: the view might be outside edge limit 1773 // when there is delta in onLayoutChildren(). 1774 while (mGrid.getLastVisibleIndex() < mFocusPosition) { 1775 mGrid.appendOneColumnVisibleItems(); 1776 } 1777 } 1778 } else { 1779 // prune disabled(e.g. in RowsFragment transition): append all removed items 1780 while (mGrid.appendOneColumnVisibleItems() 1781 && mGrid.getLastVisibleIndex() < savedLastPos); 1782 } 1783 } 1784 updateScrollMin(); 1785 updateScrollMax(); 1786 updateScrollSecondAxis(); 1787 } 1788 1789 public void removeAndRecycleAllViews(RecyclerView.Recycler recycler) { 1790 if (TRACE) TraceHelper.beginSection("removeAndRecycleAllViews"); 1791 if (DEBUG) Log.v(TAG, "removeAndRecycleAllViews " + getChildCount()); 1792 for (int i = getChildCount() - 1; i >= 0; i--) { 1793 removeAndRecycleViewAt(i, recycler); 1794 } 1795 if (TRACE) TraceHelper.endSection(); 1796 } 1797 1798 // Lays out items based on the current scroll position 1799 @Override 1800 public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { 1801 if (DEBUG) { 1802 Log.v(getTag(), "layoutChildren start numRows " + mNumRows + " mScrollOffsetSecondary " 1803 + mScrollOffsetSecondary + " mScrollOffsetPrimary " + mScrollOffsetPrimary 1804 + " inPreLayout " + state.isPreLayout() 1805 + " didStructureChange " + state.didStructureChange() 1806 + " mForceFullLayout " + mForceFullLayout); 1807 Log.v(getTag(), "width " + getWidth() + " height " + getHeight()); 1808 } 1809 1810 if (mNumRows == 0) { 1811 // haven't done measure yet 1812 return; 1813 } 1814 final int itemCount = state.getItemCount(); 1815 if (itemCount < 0) { 1816 return; 1817 } 1818 1819 if (!mLayoutEnabled) { 1820 discardLayoutInfo(); 1821 removeAndRecycleAllViews(recycler); 1822 return; 1823 } 1824 mInLayout = true; 1825 1826 if (state.didStructureChange()) { 1827 // didStructureChange() == true means attached item has been removed/added. 1828 // scroll animation: we are unable to continue a scroll animation, 1829 // kill the scroll animation, and let ItemAnimation move the item to new position. 1830 // position smooth scroller: kill the animation and stop at final position. 1831 // pending smooth scroller: stop and scroll to current focus position. 1832 mBaseGridView.stopScroll(); 1833 } 1834 final boolean scrollToFocus = !isSmoothScrolling() 1835 && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED; 1836 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 1837 mFocusPosition = mFocusPosition + mFocusPositionOffset; 1838 mSubFocusPosition = 0; 1839 } 1840 mFocusPositionOffset = 0; 1841 saveContext(recycler, state); 1842 1843 View savedFocusView = findViewByPosition(mFocusPosition); 1844 int savedFocusPos = mFocusPosition; 1845 int savedSubFocusPos = mSubFocusPosition; 1846 boolean hadFocus = mBaseGridView.hasFocus(); 1847 1848 // Track the old focus view so we can adjust our system scroll position 1849 // so that any scroll animations happening now will remain valid. 1850 // We must use same delta in Pre Layout (if prelayout exists) and second layout. 1851 // So we cache the deltas in PreLayout and use it in second layout. 1852 int delta = 0, deltaSecondary = 0; 1853 if (mFocusPosition != NO_POSITION && scrollToFocus 1854 && mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) { 1855 // FIXME: we should get the remaining scroll animation offset from RecyclerView 1856 if (savedFocusView != null) { 1857 if (getScrollPosition(savedFocusView, savedFocusView.findFocus(), sTwoInts)) { 1858 delta = sTwoInts[0]; 1859 deltaSecondary = sTwoInts[1]; 1860 } 1861 } 1862 } 1863 1864 if (mInFastRelayout = layoutInit()) { 1865 fastRelayout(); 1866 // appends items till focus position. 1867 if (mFocusPosition != NO_POSITION) { 1868 View focusView = findViewByPosition(mFocusPosition); 1869 if (focusView != null) { 1870 if (scrollToFocus) { 1871 scrollToView(focusView, false); 1872 } 1873 if (hadFocus && !focusView.hasFocus()) { 1874 focusView.requestFocus(); 1875 } 1876 } 1877 } 1878 } else { 1879 mInLayoutSearchFocus = hadFocus; 1880 if (mFocusPosition != NO_POSITION) { 1881 // appends items till focus position. 1882 while (appendOneColumnVisibleItems() 1883 && findViewByPosition(mFocusPosition) == null) ; 1884 } 1885 // multiple rounds: scrollToView of first round may drag first/last child into 1886 // "visible window" and we update scrollMin/scrollMax then run second scrollToView 1887 int oldFirstVisible; 1888 int oldLastVisible; 1889 do { 1890 updateScrollMin(); 1891 updateScrollMax(); 1892 oldFirstVisible = mGrid.getFirstVisibleIndex(); 1893 oldLastVisible = mGrid.getLastVisibleIndex(); 1894 View focusView = findViewByPosition(mFocusPosition); 1895 // we need force to initialize the child view's position 1896 scrollToView(focusView, false); 1897 if (focusView != null && hadFocus && !focusView.hasFocus()) { 1898 focusView.requestFocus(); 1899 } 1900 appendVisibleItems(); 1901 prependVisibleItems(); 1902 removeInvisibleViewsAtFront(); 1903 removeInvisibleViewsAtEnd(); 1904 } while (mGrid.getFirstVisibleIndex() != oldFirstVisible || 1905 mGrid.getLastVisibleIndex() != oldLastVisible); 1906 } 1907 1908 if (scrollToFocus) { 1909 scrollDirectionPrimary(-delta); 1910 scrollDirectionSecondary(-deltaSecondary); 1911 } 1912 appendVisibleItems(); 1913 prependVisibleItems(); 1914 removeInvisibleViewsAtFront(); 1915 removeInvisibleViewsAtEnd(); 1916 1917 if (DEBUG) { 1918 StringWriter sw = new StringWriter(); 1919 PrintWriter pw = new PrintWriter(sw); 1920 mGrid.debugPrint(pw); 1921 Log.d(getTag(), sw.toString()); 1922 } 1923 1924 if (mRowSecondarySizeRefresh) { 1925 mRowSecondarySizeRefresh = false; 1926 } else { 1927 updateRowSecondarySizeRefresh(); 1928 } 1929 1930 // For fastRelayout, only dispatch event when focus position changes. 1931 if (mInFastRelayout && (mFocusPosition != savedFocusPos || mSubFocusPosition != 1932 savedSubFocusPos || findViewByPosition(mFocusPosition) != savedFocusView)) { 1933 dispatchChildSelected(); 1934 } else if (!mInFastRelayout && mInLayoutSearchFocus) { 1935 // For full layout we dispatchChildSelected() in createItem() unless searched all 1936 // children and found none is focusable then dispatchChildSelected() here. 1937 dispatchChildSelected(); 1938 } 1939 1940 mInLayout = false; 1941 leaveContext(); 1942 if (DEBUG) Log.v(getTag(), "layoutChildren end"); 1943 } 1944 1945 private void offsetChildrenSecondary(int increment) { 1946 final int childCount = getChildCount(); 1947 if (mOrientation == HORIZONTAL) { 1948 for (int i = 0; i < childCount; i++) { 1949 getChildAt(i).offsetTopAndBottom(increment); 1950 } 1951 } else { 1952 for (int i = 0; i < childCount; i++) { 1953 getChildAt(i).offsetLeftAndRight(increment); 1954 } 1955 } 1956 } 1957 1958 private void offsetChildrenPrimary(int increment) { 1959 final int childCount = getChildCount(); 1960 if (mOrientation == VERTICAL) { 1961 for (int i = 0; i < childCount; i++) { 1962 getChildAt(i).offsetTopAndBottom(increment); 1963 } 1964 } else { 1965 for (int i = 0; i < childCount; i++) { 1966 getChildAt(i).offsetLeftAndRight(increment); 1967 } 1968 } 1969 } 1970 1971 @Override 1972 public int scrollHorizontallyBy(int dx, Recycler recycler, RecyclerView.State state) { 1973 if (DEBUG) Log.v(getTag(), "scrollHorizontallyBy " + dx); 1974 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1975 return 0; 1976 } 1977 saveContext(recycler, state); 1978 mInScroll = true; 1979 int result; 1980 if (mOrientation == HORIZONTAL) { 1981 result = scrollDirectionPrimary(dx); 1982 } else { 1983 result = scrollDirectionSecondary(dx); 1984 } 1985 leaveContext(); 1986 mInScroll = false; 1987 return result; 1988 } 1989 1990 @Override 1991 public int scrollVerticallyBy(int dy, Recycler recycler, RecyclerView.State state) { 1992 if (DEBUG) Log.v(getTag(), "scrollVerticallyBy " + dy); 1993 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1994 return 0; 1995 } 1996 mInScroll = true; 1997 saveContext(recycler, state); 1998 int result; 1999 if (mOrientation == VERTICAL) { 2000 result = scrollDirectionPrimary(dy); 2001 } else { 2002 result = scrollDirectionSecondary(dy); 2003 } 2004 leaveContext(); 2005 mInScroll = false; 2006 return result; 2007 } 2008 2009 // scroll in main direction may add/prune views 2010 private int scrollDirectionPrimary(int da) { 2011 if (TRACE) TraceHelper.beginSection("scrollPrimary"); 2012 boolean isMaxUnknown = false, isMinUnknown = false; 2013 int minScroll = 0, maxScroll = 0; 2014 if (da > 0) { 2015 isMaxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 2016 if (!isMaxUnknown) { 2017 maxScroll = mWindowAlignment.mainAxis().getMaxScroll(); 2018 if (mScrollOffsetPrimary + da > maxScroll) { 2019 da = maxScroll - mScrollOffsetPrimary; 2020 } 2021 } 2022 } else if (da < 0) { 2023 isMinUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 2024 if (!isMinUnknown) { 2025 minScroll = mWindowAlignment.mainAxis().getMinScroll(); 2026 if (mScrollOffsetPrimary + da < minScroll) { 2027 da = minScroll - mScrollOffsetPrimary; 2028 } 2029 } 2030 } 2031 if (da == 0) { 2032 if (TRACE) TraceHelper.endSection(); 2033 return 0; 2034 } 2035 offsetChildrenPrimary(-da); 2036 mScrollOffsetPrimary += da; 2037 if (mInLayout) { 2038 if (TRACE) TraceHelper.endSection(); 2039 return da; 2040 } 2041 2042 int childCount = getChildCount(); 2043 boolean updated; 2044 2045 if (mReverseFlowPrimary ? da > 0 : da < 0) { 2046 prependVisibleItems(); 2047 } else { 2048 appendVisibleItems(); 2049 } 2050 updated = getChildCount() > childCount; 2051 childCount = getChildCount(); 2052 2053 if (TRACE) TraceHelper.beginSection("remove"); 2054 if (mReverseFlowPrimary ? da > 0 : da < 0) { 2055 removeInvisibleViewsAtEnd(); 2056 } else { 2057 removeInvisibleViewsAtFront(); 2058 } 2059 if (TRACE) TraceHelper.endSection(); 2060 updated |= getChildCount() < childCount; 2061 if (updated) { 2062 updateRowSecondarySizeRefresh(); 2063 } 2064 2065 mBaseGridView.invalidate(); 2066 if (TRACE) TraceHelper.endSection(); 2067 return da; 2068 } 2069 2070 // scroll in second direction will not add/prune views 2071 private int scrollDirectionSecondary(int dy) { 2072 if (dy == 0) { 2073 return 0; 2074 } 2075 offsetChildrenSecondary(-dy); 2076 mScrollOffsetSecondary += dy; 2077 mBaseGridView.invalidate(); 2078 return dy; 2079 } 2080 2081 private void updateScrollMax() { 2082 int highVisiblePos = (!mReverseFlowPrimary) ? mGrid.getLastVisibleIndex() 2083 : mGrid.getFirstVisibleIndex(); 2084 int highMaxPos = (!mReverseFlowPrimary) ? mState.getItemCount() - 1 : 0; 2085 if (highVisiblePos < 0) { 2086 return; 2087 } 2088 final boolean highAvailable = highVisiblePos == highMaxPos; 2089 final boolean maxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 2090 if (!highAvailable && maxUnknown) { 2091 return; 2092 } 2093 int maxEdge = mGrid.findRowMax(true, sTwoInts) + mScrollOffsetPrimary; 2094 int rowIndex = sTwoInts[0]; 2095 int pos = sTwoInts[1]; 2096 int savedMaxEdge = mWindowAlignment.mainAxis().getMaxEdge(); 2097 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 2098 int maxScroll = getPrimarySystemScrollPositionOfChildMax(findViewByPosition(pos)); 2099 mWindowAlignment.mainAxis().setMaxEdge(savedMaxEdge); 2100 2101 if (highAvailable) { 2102 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 2103 mWindowAlignment.mainAxis().setMaxScroll(maxScroll); 2104 if (DEBUG) Log.v(getTag(), "updating scroll maxEdge to " + maxEdge + 2105 " scrollMax to " + maxScroll); 2106 } else { 2107 mWindowAlignment.mainAxis().invalidateScrollMax(); 2108 if (DEBUG) Log.v(getTag(), "Invalidate scrollMax since it should be " 2109 + "greater than " + maxScroll); 2110 } 2111 } 2112 2113 private void updateScrollMin() { 2114 int lowVisiblePos = (!mReverseFlowPrimary) ? mGrid.getFirstVisibleIndex() 2115 : mGrid.getLastVisibleIndex(); 2116 int lowMinPos = (!mReverseFlowPrimary) ? 0 : mState.getItemCount() - 1; 2117 if (lowVisiblePos < 0) { 2118 return; 2119 } 2120 final boolean lowAvailable = lowVisiblePos == lowMinPos; 2121 final boolean minUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 2122 if (!lowAvailable && minUnknown) { 2123 return; 2124 } 2125 int minEdge = mGrid.findRowMin(false, sTwoInts) + mScrollOffsetPrimary; 2126 int rowIndex = sTwoInts[0]; 2127 int pos = sTwoInts[1]; 2128 int savedMinEdge = mWindowAlignment.mainAxis().getMinEdge(); 2129 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2130 int minScroll = getPrimarySystemScrollPosition(findViewByPosition(pos)); 2131 mWindowAlignment.mainAxis().setMinEdge(savedMinEdge); 2132 2133 if (lowAvailable) { 2134 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2135 mWindowAlignment.mainAxis().setMinScroll(minScroll); 2136 if (DEBUG) Log.v(getTag(), "updating scroll minEdge to " + minEdge + 2137 " scrollMin to " + minScroll); 2138 } else { 2139 mWindowAlignment.mainAxis().invalidateScrollMin(); 2140 if (DEBUG) Log.v(getTag(), "Invalidate scrollMin, since it should be " 2141 + "less than " + minScroll); 2142 } 2143 } 2144 2145 private void updateScrollSecondAxis() { 2146 mWindowAlignment.secondAxis().setMinEdge(0); 2147 mWindowAlignment.secondAxis().setMaxEdge(getSizeSecondary()); 2148 } 2149 2150 private void initScrollController() { 2151 mWindowAlignment.reset(); 2152 mWindowAlignment.horizontal.setSize(getWidth()); 2153 mWindowAlignment.vertical.setSize(getHeight()); 2154 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2155 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2156 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2157 mScrollOffsetPrimary = -mWindowAlignment.mainAxis().getPaddingLow(); 2158 mScrollOffsetSecondary = -mWindowAlignment.secondAxis().getPaddingLow(); 2159 2160 if (DEBUG) { 2161 Log.v(getTag(), "initScrollController mSizePrimary " + mSizePrimary 2162 + " mWindowAlignment " + mWindowAlignment 2163 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2164 } 2165 } 2166 2167 private void updateScrollController() { 2168 // mScrollOffsetPrimary and mScrollOffsetSecondary includes the padding. 2169 // e.g. when topPadding is 16 for horizontal grid view, the initial 2170 // mScrollOffsetSecondary is -16. fastRelayout() put views based on offsets(not padding), 2171 // when padding changes to 20, we also need update mScrollOffsetSecondary to -20 before 2172 // fastRelayout() is performed 2173 int paddingPrimaryDiff, paddingSecondaryDiff; 2174 if (mOrientation == HORIZONTAL) { 2175 paddingPrimaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2176 paddingSecondaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2177 } else { 2178 paddingPrimaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2179 paddingSecondaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2180 } 2181 mScrollOffsetPrimary -= paddingPrimaryDiff; 2182 mScrollOffsetSecondary -= paddingSecondaryDiff; 2183 2184 mWindowAlignment.horizontal.setSize(getWidth()); 2185 mWindowAlignment.vertical.setSize(getHeight()); 2186 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2187 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2188 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2189 2190 if (DEBUG) { 2191 Log.v(getTag(), "updateScrollController mSizePrimary " + mSizePrimary 2192 + " mWindowAlignment " + mWindowAlignment 2193 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2194 } 2195 } 2196 2197 public void setSelection(RecyclerView parent, int position, 2198 int primaryScrollExtra) { 2199 setSelection(parent, position, 0, false, primaryScrollExtra); 2200 } 2201 2202 public void setSelectionSmooth(RecyclerView parent, int position) { 2203 setSelection(parent, position, 0, true, 0); 2204 } 2205 2206 public void setSelectionWithSub(RecyclerView parent, int position, int subposition, 2207 int primaryScrollExtra) { 2208 setSelection(parent, position, subposition, false, primaryScrollExtra); 2209 } 2210 2211 public void setSelectionSmoothWithSub(RecyclerView parent, int position, int subposition) { 2212 setSelection(parent, position, subposition, true, 0); 2213 } 2214 2215 public int getSelection() { 2216 return mFocusPosition; 2217 } 2218 2219 public int getSubSelection() { 2220 return mSubFocusPosition; 2221 } 2222 2223 public void setSelection(RecyclerView parent, int position, int subposition, boolean smooth, 2224 int primaryScrollExtra) { 2225 if (mFocusPosition != position && position != NO_POSITION 2226 || subposition != mSubFocusPosition || primaryScrollExtra != mPrimaryScrollExtra) { 2227 scrollToSelection(parent, position, subposition, smooth, primaryScrollExtra); 2228 } 2229 } 2230 2231 private void scrollToSelection(RecyclerView parent, int position, int subposition, 2232 boolean smooth, int primaryScrollExtra) { 2233 if (TRACE) TraceHelper.beginSection("scrollToSelection"); 2234 mPrimaryScrollExtra = primaryScrollExtra; 2235 View view = findViewByPosition(position); 2236 if (view != null) { 2237 mInSelection = true; 2238 scrollToView(view, smooth); 2239 mInSelection = false; 2240 } else { 2241 mFocusPosition = position; 2242 mSubFocusPosition = subposition; 2243 mFocusPositionOffset = Integer.MIN_VALUE; 2244 if (!mLayoutEnabled) { 2245 return; 2246 } 2247 if (smooth) { 2248 if (!hasDoneFirstLayout()) { 2249 Log.w(getTag(), "setSelectionSmooth should " + 2250 "not be called before first layout pass"); 2251 return; 2252 } 2253 startPositionSmoothScroller(position); 2254 } else { 2255 mForceFullLayout = true; 2256 parent.requestLayout(); 2257 } 2258 } 2259 if (TRACE) TraceHelper.endSection(); 2260 } 2261 2262 void startPositionSmoothScroller(int position) { 2263 LinearSmoothScroller linearSmoothScroller = new GridLinearSmoothScroller() { 2264 @Override 2265 public PointF computeScrollVectorForPosition(int targetPosition) { 2266 if (getChildCount() == 0) { 2267 return null; 2268 } 2269 final int firstChildPos = getPosition(getChildAt(0)); 2270 // TODO We should be able to deduce direction from bounds of current and target 2271 // focus, rather than making assumptions about positions and directionality 2272 final boolean isStart = mReverseFlowPrimary ? targetPosition > firstChildPos 2273 : targetPosition < firstChildPos; 2274 final int direction = isStart ? -1 : 1; 2275 if (mOrientation == HORIZONTAL) { 2276 return new PointF(direction, 0); 2277 } else { 2278 return new PointF(0, direction); 2279 } 2280 } 2281 2282 }; 2283 linearSmoothScroller.setTargetPosition(position); 2284 startSmoothScroll(linearSmoothScroller); 2285 } 2286 2287 private void processPendingMovement(boolean forward) { 2288 if (forward ? hasCreatedLastItem() : hasCreatedFirstItem()) { 2289 return; 2290 } 2291 if (mPendingMoveSmoothScroller == null) { 2292 // Stop existing scroller and create a new PendingMoveSmoothScroller. 2293 mBaseGridView.stopScroll(); 2294 PendingMoveSmoothScroller linearSmoothScroller = new PendingMoveSmoothScroller( 2295 forward ? 1 : -1, mNumRows > 1); 2296 mFocusPositionOffset = 0; 2297 startSmoothScroll(linearSmoothScroller); 2298 if (linearSmoothScroller.isRunning()) { 2299 mPendingMoveSmoothScroller = linearSmoothScroller; 2300 } 2301 } else { 2302 if (forward) { 2303 mPendingMoveSmoothScroller.increasePendingMoves(); 2304 } else { 2305 mPendingMoveSmoothScroller.decreasePendingMoves(); 2306 } 2307 } 2308 } 2309 2310 @Override 2311 public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) { 2312 if (DEBUG) Log.v(getTag(), "onItemsAdded positionStart " 2313 + positionStart + " itemCount " + itemCount); 2314 if (mFocusPosition != NO_POSITION && mGrid != null && mGrid.getFirstVisibleIndex() >= 0 2315 && mFocusPositionOffset != Integer.MIN_VALUE) { 2316 int pos = mFocusPosition + mFocusPositionOffset; 2317 if (positionStart <= pos) { 2318 mFocusPositionOffset += itemCount; 2319 } 2320 } 2321 mChildrenStates.clear(); 2322 } 2323 2324 @Override 2325 public void onItemsChanged(RecyclerView recyclerView) { 2326 if (DEBUG) Log.v(getTag(), "onItemsChanged"); 2327 mFocusPositionOffset = 0; 2328 mChildrenStates.clear(); 2329 } 2330 2331 @Override 2332 public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) { 2333 if (DEBUG) Log.v(getTag(), "onItemsRemoved positionStart " 2334 + positionStart + " itemCount " + itemCount); 2335 if (mFocusPosition != NO_POSITION && mGrid != null && mGrid.getFirstVisibleIndex() >= 0 2336 && mFocusPositionOffset != Integer.MIN_VALUE) { 2337 int pos = mFocusPosition + mFocusPositionOffset; 2338 if (positionStart <= pos) { 2339 if (positionStart + itemCount > pos) { 2340 // stop updating offset after the focus item was removed 2341 mFocusPositionOffset = Integer.MIN_VALUE; 2342 } else { 2343 mFocusPositionOffset -= itemCount; 2344 } 2345 } 2346 } 2347 mChildrenStates.clear(); 2348 } 2349 2350 @Override 2351 public void onItemsMoved(RecyclerView recyclerView, int fromPosition, int toPosition, 2352 int itemCount) { 2353 if (DEBUG) Log.v(getTag(), "onItemsMoved fromPosition " 2354 + fromPosition + " toPosition " + toPosition); 2355 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2356 int pos = mFocusPosition + mFocusPositionOffset; 2357 if (fromPosition <= pos && pos < fromPosition + itemCount) { 2358 // moved items include focused position 2359 mFocusPositionOffset += toPosition - fromPosition; 2360 } else if (fromPosition < pos && toPosition > pos - itemCount) { 2361 // move items before focus position to after focused position 2362 mFocusPositionOffset -= itemCount; 2363 } else if (fromPosition > pos && toPosition < pos) { 2364 // move items after focus position to before focused position 2365 mFocusPositionOffset += itemCount; 2366 } 2367 } 2368 mChildrenStates.clear(); 2369 } 2370 2371 @Override 2372 public void onItemsUpdated(RecyclerView recyclerView, int positionStart, int itemCount) { 2373 if (DEBUG) Log.v(getTag(), "onItemsUpdated positionStart " 2374 + positionStart + " itemCount " + itemCount); 2375 for (int i = positionStart, end = positionStart + itemCount; i < end; i++) { 2376 mChildrenStates.remove(i); 2377 } 2378 } 2379 2380 @Override 2381 public boolean onRequestChildFocus(RecyclerView parent, View child, View focused) { 2382 if (mFocusSearchDisabled) { 2383 return true; 2384 } 2385 if (getPositionByView(child) == NO_POSITION) { 2386 // This shouldn't happen, but in case it does be sure not to attempt a 2387 // scroll to a view whose item has been removed. 2388 return true; 2389 } 2390 if (!mInLayout && !mInSelection && !mInScroll) { 2391 scrollToView(child, focused, true); 2392 } 2393 return true; 2394 } 2395 2396 @Override 2397 public boolean requestChildRectangleOnScreen(RecyclerView parent, View view, Rect rect, 2398 boolean immediate) { 2399 if (DEBUG) Log.v(getTag(), "requestChildRectangleOnScreen " + view + " " + rect); 2400 return false; 2401 } 2402 2403 int getScrollOffsetX() { 2404 return mOrientation == HORIZONTAL ? mScrollOffsetPrimary : mScrollOffsetSecondary; 2405 } 2406 2407 int getScrollOffsetY() { 2408 return mOrientation == HORIZONTAL ? mScrollOffsetSecondary : mScrollOffsetPrimary; 2409 } 2410 2411 public void getViewSelectedOffsets(View view, int[] offsets) { 2412 if (mOrientation == HORIZONTAL) { 2413 offsets[0] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2414 offsets[1] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2415 } else { 2416 offsets[1] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2417 offsets[0] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2418 } 2419 } 2420 2421 private int getPrimarySystemScrollPosition(View view) { 2422 final int viewCenterPrimary = mScrollOffsetPrimary + getViewCenter(view); 2423 final int viewMin = getViewMin(view); 2424 final int viewMax = getViewMax(view); 2425 // TODO: change to use State object in onRequestChildFocus() 2426 boolean isMin, isMax; 2427 if (!mReverseFlowPrimary) { 2428 isMin = mGrid.getFirstVisibleIndex() == 0; 2429 isMax = mGrid.getLastVisibleIndex() == (mState == null ? 2430 getItemCount() : mState.getItemCount()) - 1; 2431 } else { 2432 isMax = mGrid.getFirstVisibleIndex() == 0; 2433 isMin = mGrid.getLastVisibleIndex() == (mState == null ? 2434 getItemCount() : mState.getItemCount()) - 1; 2435 } 2436 for (int i = getChildCount() - 1; (isMin || isMax) && i >= 0; i--) { 2437 View v = getChildAt(i); 2438 if (v == view || v == null) { 2439 continue; 2440 } 2441 if (isMin && getViewMin(v) < viewMin) { 2442 isMin = false; 2443 } 2444 if (isMax && getViewMax(v) > viewMax) { 2445 isMax = false; 2446 } 2447 } 2448 return mWindowAlignment.mainAxis().getSystemScrollPos(viewCenterPrimary, isMin, isMax); 2449 } 2450 2451 private int getPrimarySystemScrollPositionOfChildMax(View view) { 2452 int scrollPosition = getPrimarySystemScrollPosition(view); 2453 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 2454 int[] multipleAligns = lp.getAlignMultiple(); 2455 if (multipleAligns != null && multipleAligns.length > 0) { 2456 scrollPosition += multipleAligns[multipleAligns.length - 1] - multipleAligns[0]; 2457 } 2458 return scrollPosition; 2459 } 2460 2461 /** 2462 * Get adjusted primary position for a given childView (if there is multiple ItemAlignment defined 2463 * on the view). 2464 */ 2465 private int getAdjustedPrimaryScrollPosition(int scrollPrimary, View view, View childView) { 2466 int subindex = getSubPositionByView(view, childView); 2467 if (subindex != 0) { 2468 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 2469 scrollPrimary += lp.getAlignMultiple()[subindex] - lp.getAlignMultiple()[0]; 2470 } 2471 return scrollPrimary; 2472 } 2473 2474 private int getSecondarySystemScrollPosition(View view) { 2475 int viewCenterSecondary = mScrollOffsetSecondary + getViewCenterSecondary(view); 2476 int pos = getPositionByView(view); 2477 Grid.Location location = mGrid.getLocation(pos); 2478 final int row = location.row; 2479 final boolean isMin, isMax; 2480 if (!mReverseFlowSecondary) { 2481 isMin = row == 0; 2482 isMax = row == mGrid.getNumRows() - 1; 2483 } else { 2484 isMax = row == 0; 2485 isMin = row == mGrid.getNumRows() - 1; 2486 } 2487 return mWindowAlignment.secondAxis().getSystemScrollPos(viewCenterSecondary, isMin, isMax); 2488 } 2489 2490 /** 2491 * Scroll to a given child view and change mFocusPosition. 2492 */ 2493 private void scrollToView(View view, boolean smooth) { 2494 scrollToView(view, view == null ? null : view.findFocus(), smooth); 2495 } 2496 2497 /** 2498 * Scroll to a given child view and change mFocusPosition. 2499 */ 2500 private void scrollToView(View view, View childView, boolean smooth) { 2501 int newFocusPosition = getPositionByView(view); 2502 int newSubFocusPosition = getSubPositionByView(view, childView); 2503 if (newFocusPosition != mFocusPosition || newSubFocusPosition != mSubFocusPosition) { 2504 mFocusPosition = newFocusPosition; 2505 mSubFocusPosition = newSubFocusPosition; 2506 mFocusPositionOffset = 0; 2507 if (!mInLayout) { 2508 dispatchChildSelected(); 2509 } 2510 if (mBaseGridView.isChildrenDrawingOrderEnabledInternal()) { 2511 mBaseGridView.invalidate(); 2512 } 2513 } 2514 if (view == null) { 2515 return; 2516 } 2517 if (!view.hasFocus() && mBaseGridView.hasFocus()) { 2518 // transfer focus to the child if it does not have focus yet (e.g. triggered 2519 // by setSelection()) 2520 view.requestFocus(); 2521 } 2522 if (!mScrollEnabled && smooth) { 2523 return; 2524 } 2525 if (getScrollPosition(view, childView, sTwoInts)) { 2526 scrollGrid(sTwoInts[0], sTwoInts[1], smooth); 2527 } 2528 } 2529 2530 private boolean getScrollPosition(View view, View childView, int[] deltas) { 2531 switch (mFocusScrollStrategy) { 2532 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2533 default: 2534 return getAlignedPosition(view, childView, deltas); 2535 case BaseGridView.FOCUS_SCROLL_ITEM: 2536 case BaseGridView.FOCUS_SCROLL_PAGE: 2537 return getNoneAlignedPosition(view, deltas); 2538 } 2539 } 2540 2541 private boolean getNoneAlignedPosition(View view, int[] deltas) { 2542 int pos = getPositionByView(view); 2543 int viewMin = getViewMin(view); 2544 int viewMax = getViewMax(view); 2545 // we either align "firstView" to left/top padding edge 2546 // or align "lastView" to right/bottom padding edge 2547 View firstView = null; 2548 View lastView = null; 2549 int paddingLow = mWindowAlignment.mainAxis().getPaddingLow(); 2550 int clientSize = mWindowAlignment.mainAxis().getClientSize(); 2551 final int row = mGrid.getRowIndex(pos); 2552 if (viewMin < paddingLow) { 2553 // view enters low padding area: 2554 firstView = view; 2555 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2556 // scroll one "page" left/top, 2557 // align first visible item of the "page" at the low padding edge. 2558 while (prependOneColumnVisibleItems()) { 2559 CircularIntArray positions = 2560 mGrid.getItemPositionsInRows(mGrid.getFirstVisibleIndex(), pos)[row]; 2561 firstView = findViewByPosition(positions.get(0)); 2562 if (viewMax - getViewMin(firstView) > clientSize) { 2563 if (positions.size() > 2) { 2564 firstView = findViewByPosition(positions.get(2)); 2565 } 2566 break; 2567 } 2568 } 2569 } 2570 } else if (viewMax > clientSize + paddingLow) { 2571 // view enters high padding area: 2572 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2573 // scroll whole one page right/bottom, align view at the low padding edge. 2574 firstView = view; 2575 do { 2576 CircularIntArray positions = 2577 mGrid.getItemPositionsInRows(pos, mGrid.getLastVisibleIndex())[row]; 2578 lastView = findViewByPosition(positions.get(positions.size() - 1)); 2579 if (getViewMax(lastView) - viewMin > clientSize) { 2580 lastView = null; 2581 break; 2582 } 2583 } while (appendOneColumnVisibleItems()); 2584 if (lastView != null) { 2585 // however if we reached end, we should align last view. 2586 firstView = null; 2587 } 2588 } else { 2589 lastView = view; 2590 } 2591 } 2592 int scrollPrimary = 0; 2593 int scrollSecondary = 0; 2594 if (firstView != null) { 2595 scrollPrimary = getViewMin(firstView) - paddingLow; 2596 } else if (lastView != null) { 2597 scrollPrimary = getViewMax(lastView) - (paddingLow + clientSize); 2598 } 2599 View secondaryAlignedView; 2600 if (firstView != null) { 2601 secondaryAlignedView = firstView; 2602 } else if (lastView != null) { 2603 secondaryAlignedView = lastView; 2604 } else { 2605 secondaryAlignedView = view; 2606 } 2607 scrollSecondary = getSecondarySystemScrollPosition(secondaryAlignedView); 2608 scrollSecondary -= mScrollOffsetSecondary; 2609 if (scrollPrimary != 0 || scrollSecondary != 0) { 2610 deltas[0] = scrollPrimary; 2611 deltas[1] = scrollSecondary; 2612 return true; 2613 } 2614 return false; 2615 } 2616 2617 private boolean getAlignedPosition(View view, View childView, int[] deltas) { 2618 int scrollPrimary = getPrimarySystemScrollPosition(view); 2619 if (childView != null) { 2620 scrollPrimary = getAdjustedPrimaryScrollPosition(scrollPrimary, view, childView); 2621 } 2622 int scrollSecondary = getSecondarySystemScrollPosition(view); 2623 if (DEBUG) { 2624 Log.v(getTag(), "getAlignedPosition " + scrollPrimary + " " + scrollSecondary 2625 + " " + mPrimaryScrollExtra + " " + mWindowAlignment); 2626 Log.v(getTag(), "getAlignedPosition " + mScrollOffsetPrimary + " " + mScrollOffsetSecondary); 2627 } 2628 scrollPrimary -= mScrollOffsetPrimary; 2629 scrollSecondary -= mScrollOffsetSecondary; 2630 scrollPrimary += mPrimaryScrollExtra; 2631 if (scrollPrimary != 0 || scrollSecondary != 0) { 2632 deltas[0] = scrollPrimary; 2633 deltas[1] = scrollSecondary; 2634 return true; 2635 } 2636 return false; 2637 } 2638 2639 private void scrollGrid(int scrollPrimary, int scrollSecondary, boolean smooth) { 2640 if (mInLayout) { 2641 scrollDirectionPrimary(scrollPrimary); 2642 scrollDirectionSecondary(scrollSecondary); 2643 } else { 2644 int scrollX; 2645 int scrollY; 2646 if (mOrientation == HORIZONTAL) { 2647 scrollX = scrollPrimary; 2648 scrollY = scrollSecondary; 2649 } else { 2650 scrollX = scrollSecondary; 2651 scrollY = scrollPrimary; 2652 } 2653 if (smooth) { 2654 mBaseGridView.smoothScrollBy(scrollX, scrollY); 2655 } else { 2656 mBaseGridView.scrollBy(scrollX, scrollY); 2657 } 2658 } 2659 } 2660 2661 public void setPruneChild(boolean pruneChild) { 2662 if (mPruneChild != pruneChild) { 2663 mPruneChild = pruneChild; 2664 if (mPruneChild) { 2665 requestLayout(); 2666 } 2667 } 2668 } 2669 2670 public boolean getPruneChild() { 2671 return mPruneChild; 2672 } 2673 2674 public void setScrollEnabled(boolean scrollEnabled) { 2675 if (mScrollEnabled != scrollEnabled) { 2676 mScrollEnabled = scrollEnabled; 2677 if (mScrollEnabled && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED 2678 && mFocusPosition != NO_POSITION) { 2679 scrollToSelection(mBaseGridView, mFocusPosition, mSubFocusPosition, 2680 true, mPrimaryScrollExtra); 2681 } 2682 } 2683 } 2684 2685 public boolean isScrollEnabled() { 2686 return mScrollEnabled; 2687 } 2688 2689 private int findImmediateChildIndex(View view) { 2690 if (mBaseGridView != null && view != mBaseGridView) { 2691 view = findContainingItemView(view); 2692 if (view != null) { 2693 for (int i = 0, count = getChildCount(); i < count; i++) { 2694 if (getChildAt(i) == view) { 2695 return i; 2696 } 2697 } 2698 } 2699 } 2700 return NO_POSITION; 2701 } 2702 2703 void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 2704 if (gainFocus) { 2705 // if gridview.requestFocus() is called, select first focusable child. 2706 for (int i = mFocusPosition; ;i++) { 2707 View view = findViewByPosition(i); 2708 if (view == null) { 2709 break; 2710 } 2711 if (view.getVisibility() == View.VISIBLE && view.hasFocusable()) { 2712 view.requestFocus(); 2713 break; 2714 } 2715 } 2716 } 2717 } 2718 2719 void setFocusSearchDisabled(boolean disabled) { 2720 mFocusSearchDisabled = disabled; 2721 } 2722 2723 boolean isFocusSearchDisabled() { 2724 return mFocusSearchDisabled; 2725 } 2726 2727 @Override 2728 public View onInterceptFocusSearch(View focused, int direction) { 2729 if (mFocusSearchDisabled) { 2730 return focused; 2731 } 2732 return null; 2733 } 2734 2735 boolean hasPreviousViewInSameRow(int pos) { 2736 if (mGrid == null || pos == NO_POSITION || mGrid.getFirstVisibleIndex() < 0) { 2737 return false; 2738 } 2739 if (mGrid.getFirstVisibleIndex() > 0) { 2740 return true; 2741 } 2742 final int focusedRow = mGrid.getLocation(pos).row; 2743 for (int i = getChildCount() - 1; i >= 0; i--) { 2744 int position = getPositionByIndex(i); 2745 Grid.Location loc = mGrid.getLocation(position); 2746 if (loc != null && loc.row == focusedRow) { 2747 if (position < pos) { 2748 return true; 2749 } 2750 } 2751 } 2752 return false; 2753 } 2754 2755 @Override 2756 public boolean onAddFocusables(RecyclerView recyclerView, 2757 ArrayList<View> views, int direction, int focusableMode) { 2758 if (mFocusSearchDisabled) { 2759 return true; 2760 } 2761 // If this viewgroup or one of its children currently has focus then we 2762 // consider our children for focus searching in main direction on the same row. 2763 // If this viewgroup has no focus and using focus align, we want the system 2764 // to ignore our children and pass focus to the viewgroup, which will pass 2765 // focus on to its children appropriately. 2766 // If this viewgroup has no focus and not using focus align, we want to 2767 // consider the child that does not overlap with padding area. 2768 if (recyclerView.hasFocus()) { 2769 if (mPendingMoveSmoothScroller != null) { 2770 // don't find next focusable if has pending movement. 2771 return true; 2772 } 2773 final int movement = getMovement(direction); 2774 final View focused = recyclerView.findFocus(); 2775 final int focusedIndex = findImmediateChildIndex(focused); 2776 final int focusedPos = getPositionByIndex(focusedIndex); 2777 // Add focusables of focused item. 2778 if (focusedPos != NO_POSITION) { 2779 findViewByPosition(focusedPos).addFocusables(views, direction, focusableMode); 2780 } 2781 if (mGrid == null || getChildCount() == 0) { 2782 // no grid information, or no child, bail out. 2783 return true; 2784 } 2785 if ((movement == NEXT_ROW || movement == PREV_ROW) && mGrid.getNumRows() <= 1) { 2786 // For single row, cannot navigate to previous/next row. 2787 return true; 2788 } 2789 // Add focusables of neighbor depending on the focus search direction. 2790 final int focusedRow = mGrid != null && focusedPos != NO_POSITION ? 2791 mGrid.getLocation(focusedPos).row : NO_POSITION; 2792 final int focusableCount = views.size(); 2793 int inc = movement == NEXT_ITEM || movement == NEXT_ROW ? 1 : -1; 2794 int loop_end = inc > 0 ? getChildCount() - 1 : 0; 2795 int loop_start; 2796 if (focusedIndex == NO_POSITION) { 2797 loop_start = inc > 0 ? 0 : getChildCount() - 1; 2798 } else { 2799 loop_start = focusedIndex + inc; 2800 } 2801 for (int i = loop_start; inc > 0 ? i <= loop_end : i >= loop_end; i += inc) { 2802 final View child = getChildAt(i); 2803 if (child.getVisibility() != View.VISIBLE || !child.hasFocusable()) { 2804 continue; 2805 } 2806 // if there wasn't any focusing item, add the very first focusable 2807 // items and stop. 2808 if (focusedPos == NO_POSITION) { 2809 child.addFocusables(views, direction, focusableMode); 2810 if (views.size() > focusableCount) { 2811 break; 2812 } 2813 continue; 2814 } 2815 int position = getPositionByIndex(i); 2816 Grid.Location loc = mGrid.getLocation(position); 2817 if (loc == null) { 2818 continue; 2819 } 2820 if (movement == NEXT_ITEM) { 2821 // Add first focusable item on the same row 2822 if (loc.row == focusedRow && position > focusedPos) { 2823 child.addFocusables(views, direction, focusableMode); 2824 if (views.size() > focusableCount) { 2825 break; 2826 } 2827 } 2828 } else if (movement == PREV_ITEM) { 2829 // Add first focusable item on the same row 2830 if (loc.row == focusedRow && position < focusedPos) { 2831 child.addFocusables(views, direction, focusableMode); 2832 if (views.size() > focusableCount) { 2833 break; 2834 } 2835 } 2836 } else if (movement == NEXT_ROW) { 2837 // Add all focusable items after this item whose row index is bigger 2838 if (loc.row == focusedRow) { 2839 continue; 2840 } else if (loc.row < focusedRow) { 2841 break; 2842 } 2843 child.addFocusables(views, direction, focusableMode); 2844 } else if (movement == PREV_ROW) { 2845 // Add all focusable items before this item whose row index is smaller 2846 if (loc.row == focusedRow) { 2847 continue; 2848 } else if (loc.row > focusedRow) { 2849 break; 2850 } 2851 child.addFocusables(views, direction, focusableMode); 2852 } 2853 } 2854 } else { 2855 int focusableCount = views.size(); 2856 if (mFocusScrollStrategy != BaseGridView.FOCUS_SCROLL_ALIGNED) { 2857 // adding views not overlapping padding area to avoid scrolling in gaining focus 2858 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2859 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2860 for (int i = 0, count = getChildCount(); i < count; i++) { 2861 View child = getChildAt(i); 2862 if (child.getVisibility() == View.VISIBLE) { 2863 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2864 child.addFocusables(views, direction, focusableMode); 2865 } 2866 } 2867 } 2868 // if we cannot find any, then just add all children. 2869 if (views.size() == focusableCount) { 2870 for (int i = 0, count = getChildCount(); i < count; i++) { 2871 View child = getChildAt(i); 2872 if (child.getVisibility() == View.VISIBLE) { 2873 child.addFocusables(views, direction, focusableMode); 2874 } 2875 } 2876 } 2877 } else { 2878 View view = findViewByPosition(mFocusPosition); 2879 if (view != null) { 2880 view.addFocusables(views, direction, focusableMode); 2881 } 2882 } 2883 // if still cannot find any, fall through and add itself 2884 if (views.size() != focusableCount) { 2885 return true; 2886 } 2887 if (recyclerView.isFocusable()) { 2888 views.add(recyclerView); 2889 } 2890 } 2891 return true; 2892 } 2893 2894 private boolean hasCreatedLastItem() { 2895 int count = mState.getItemCount(); 2896 return count == 0 || findViewByPosition(count - 1) != null; 2897 } 2898 2899 private boolean hasCreatedFirstItem() { 2900 int count = mState.getItemCount(); 2901 return count == 0 || findViewByPosition(0) != null; 2902 } 2903 2904 boolean canScrollTo(View view) { 2905 return view.getVisibility() == View.VISIBLE && (!hasFocus() || view.hasFocusable()); 2906 } 2907 2908 @Override 2909 public View onFocusSearchFailed(View focused, int direction, Recycler recycler, 2910 RecyclerView.State state) { 2911 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed direction " + direction); 2912 2913 View view = null; 2914 int movement = getMovement(direction); 2915 final boolean isScroll = mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE; 2916 saveContext(recycler, state); 2917 if (movement == NEXT_ITEM) { 2918 if (isScroll || !mFocusOutEnd) { 2919 view = focused; 2920 } 2921 if (mScrollEnabled && !hasCreatedLastItem()) { 2922 processPendingMovement(true); 2923 view = focused; 2924 } 2925 } else if (movement == PREV_ITEM) { 2926 if (isScroll || !mFocusOutFront) { 2927 view = focused; 2928 } 2929 if (mScrollEnabled && !hasCreatedFirstItem()) { 2930 processPendingMovement(false); 2931 view = focused; 2932 } 2933 } else if (movement == NEXT_ROW) { 2934 if (isScroll || !mFocusOutSideEnd) { 2935 view = focused; 2936 } 2937 } else if (movement == PREV_ROW) { 2938 if (isScroll || !mFocusOutSideStart) { 2939 view = focused; 2940 } 2941 } 2942 leaveContext(); 2943 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed returning view " + view); 2944 return view; 2945 } 2946 2947 boolean gridOnRequestFocusInDescendants(RecyclerView recyclerView, int direction, 2948 Rect previouslyFocusedRect) { 2949 switch (mFocusScrollStrategy) { 2950 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2951 default: 2952 return gridOnRequestFocusInDescendantsAligned(recyclerView, 2953 direction, previouslyFocusedRect); 2954 case BaseGridView.FOCUS_SCROLL_PAGE: 2955 case BaseGridView.FOCUS_SCROLL_ITEM: 2956 return gridOnRequestFocusInDescendantsUnaligned(recyclerView, 2957 direction, previouslyFocusedRect); 2958 } 2959 } 2960 2961 private boolean gridOnRequestFocusInDescendantsAligned(RecyclerView recyclerView, 2962 int direction, Rect previouslyFocusedRect) { 2963 View view = findViewByPosition(mFocusPosition); 2964 if (view != null) { 2965 boolean result = view.requestFocus(direction, previouslyFocusedRect); 2966 if (!result && DEBUG) { 2967 Log.w(getTag(), "failed to request focus on " + view); 2968 } 2969 return result; 2970 } 2971 return false; 2972 } 2973 2974 private boolean gridOnRequestFocusInDescendantsUnaligned(RecyclerView recyclerView, 2975 int direction, Rect previouslyFocusedRect) { 2976 // focus to view not overlapping padding area to avoid scrolling in gaining focus 2977 int index; 2978 int increment; 2979 int end; 2980 int count = getChildCount(); 2981 if ((direction & View.FOCUS_FORWARD) != 0) { 2982 index = 0; 2983 increment = 1; 2984 end = count; 2985 } else { 2986 index = count - 1; 2987 increment = -1; 2988 end = -1; 2989 } 2990 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2991 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2992 for (int i = index; i != end; i += increment) { 2993 View child = getChildAt(i); 2994 if (child.getVisibility() == View.VISIBLE) { 2995 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2996 if (child.requestFocus(direction, previouslyFocusedRect)) { 2997 return true; 2998 } 2999 } 3000 } 3001 } 3002 return false; 3003 } 3004 3005 private final static int PREV_ITEM = 0; 3006 private final static int NEXT_ITEM = 1; 3007 private final static int PREV_ROW = 2; 3008 private final static int NEXT_ROW = 3; 3009 3010 private int getMovement(int direction) { 3011 int movement = View.FOCUS_LEFT; 3012 3013 if (mOrientation == HORIZONTAL) { 3014 switch(direction) { 3015 case View.FOCUS_LEFT: 3016 movement = (!mReverseFlowPrimary) ? PREV_ITEM : NEXT_ITEM; 3017 break; 3018 case View.FOCUS_RIGHT: 3019 movement = (!mReverseFlowPrimary) ? NEXT_ITEM : PREV_ITEM; 3020 break; 3021 case View.FOCUS_UP: 3022 movement = PREV_ROW; 3023 break; 3024 case View.FOCUS_DOWN: 3025 movement = NEXT_ROW; 3026 break; 3027 } 3028 } else if (mOrientation == VERTICAL) { 3029 switch(direction) { 3030 case View.FOCUS_LEFT: 3031 movement = (!mReverseFlowSecondary) ? PREV_ROW : NEXT_ROW; 3032 break; 3033 case View.FOCUS_RIGHT: 3034 movement = (!mReverseFlowSecondary) ? NEXT_ROW : PREV_ROW; 3035 break; 3036 case View.FOCUS_UP: 3037 movement = PREV_ITEM; 3038 break; 3039 case View.FOCUS_DOWN: 3040 movement = NEXT_ITEM; 3041 break; 3042 } 3043 } 3044 3045 return movement; 3046 } 3047 3048 int getChildDrawingOrder(RecyclerView recyclerView, int childCount, int i) { 3049 View view = findViewByPosition(mFocusPosition); 3050 if (view == null) { 3051 return i; 3052 } 3053 int focusIndex = recyclerView.indexOfChild(view); 3054 // supposely 0 1 2 3 4 5 6 7 8 9, 4 is the center item 3055 // drawing order is 0 1 2 3 9 8 7 6 5 4 3056 if (i < focusIndex) { 3057 return i; 3058 } else if (i < childCount - 1) { 3059 return focusIndex + childCount - 1 - i; 3060 } else { 3061 return focusIndex; 3062 } 3063 } 3064 3065 @Override 3066 public void onAdapterChanged(RecyclerView.Adapter oldAdapter, 3067 RecyclerView.Adapter newAdapter) { 3068 if (DEBUG) Log.v(getTag(), "onAdapterChanged to " + newAdapter); 3069 if (oldAdapter != null) { 3070 discardLayoutInfo(); 3071 mFocusPosition = NO_POSITION; 3072 mFocusPositionOffset = 0; 3073 mChildrenStates.clear(); 3074 } 3075 if (newAdapter instanceof FacetProviderAdapter) { 3076 mFacetProviderAdapter = (FacetProviderAdapter) newAdapter; 3077 } else { 3078 mFacetProviderAdapter = null; 3079 } 3080 super.onAdapterChanged(oldAdapter, newAdapter); 3081 } 3082 3083 private void discardLayoutInfo() { 3084 mGrid = null; 3085 mRowSizeSecondary = null; 3086 mRowSecondarySizeRefresh = false; 3087 } 3088 3089 public void setLayoutEnabled(boolean layoutEnabled) { 3090 if (mLayoutEnabled != layoutEnabled) { 3091 mLayoutEnabled = layoutEnabled; 3092 requestLayout(); 3093 } 3094 } 3095 3096 void setChildrenVisibility(int visiblity) { 3097 mChildVisibility = visiblity; 3098 if (mChildVisibility != -1) { 3099 int count = getChildCount(); 3100 for (int i= 0; i < count; i++) { 3101 getChildAt(i).setVisibility(mChildVisibility); 3102 } 3103 } 3104 } 3105 3106 final static class SavedState implements Parcelable { 3107 3108 int index; // index inside adapter of the current view 3109 Bundle childStates = Bundle.EMPTY; 3110 3111 @Override 3112 public void writeToParcel(Parcel out, int flags) { 3113 out.writeInt(index); 3114 out.writeBundle(childStates); 3115 } 3116 3117 @SuppressWarnings("hiding") 3118 public static final Parcelable.Creator<SavedState> CREATOR = 3119 new Parcelable.Creator<SavedState>() { 3120 @Override 3121 public SavedState createFromParcel(Parcel in) { 3122 return new SavedState(in); 3123 } 3124 3125 @Override 3126 public SavedState[] newArray(int size) { 3127 return new SavedState[size]; 3128 } 3129 }; 3130 3131 @Override 3132 public int describeContents() { 3133 return 0; 3134 } 3135 3136 SavedState(Parcel in) { 3137 index = in.readInt(); 3138 childStates = in.readBundle(GridLayoutManager.class.getClassLoader()); 3139 } 3140 3141 SavedState() { 3142 } 3143 } 3144 3145 @Override 3146 public Parcelable onSaveInstanceState() { 3147 if (DEBUG) Log.v(getTag(), "onSaveInstanceState getSelection() " + getSelection()); 3148 SavedState ss = new SavedState(); 3149 // save selected index 3150 ss.index = getSelection(); 3151 // save offscreen child (state when they are recycled) 3152 Bundle bundle = mChildrenStates.saveAsBundle(); 3153 // save views currently is on screen (TODO save cached views) 3154 for (int i = 0, count = getChildCount(); i < count; i++) { 3155 View view = getChildAt(i); 3156 int position = getPositionByView(view); 3157 if (position != NO_POSITION) { 3158 bundle = mChildrenStates.saveOnScreenView(bundle, view, position); 3159 } 3160 } 3161 ss.childStates = bundle; 3162 return ss; 3163 } 3164 3165 void onChildRecycled(RecyclerView.ViewHolder holder) { 3166 final int position = holder.getAdapterPosition(); 3167 if (position != NO_POSITION) { 3168 mChildrenStates.saveOffscreenView(holder.itemView, position); 3169 } 3170 } 3171 3172 @Override 3173 public void onRestoreInstanceState(Parcelable state) { 3174 if (!(state instanceof SavedState)) { 3175 return; 3176 } 3177 SavedState loadingState = (SavedState)state; 3178 mFocusPosition = loadingState.index; 3179 mFocusPositionOffset = 0; 3180 mChildrenStates.loadFromBundle(loadingState.childStates); 3181 mForceFullLayout = true; 3182 requestLayout(); 3183 if (DEBUG) Log.v(getTag(), "onRestoreInstanceState mFocusPosition " + mFocusPosition); 3184 } 3185 3186 @Override 3187 public int getRowCountForAccessibility(RecyclerView.Recycler recycler, 3188 RecyclerView.State state) { 3189 if (mOrientation == HORIZONTAL && mGrid != null) { 3190 return mGrid.getNumRows(); 3191 } 3192 return super.getRowCountForAccessibility(recycler, state); 3193 } 3194 3195 @Override 3196 public int getColumnCountForAccessibility(RecyclerView.Recycler recycler, 3197 RecyclerView.State state) { 3198 if (mOrientation == VERTICAL && mGrid != null) { 3199 return mGrid.getNumRows(); 3200 } 3201 return super.getColumnCountForAccessibility(recycler, state); 3202 } 3203 3204 @Override 3205 public void onInitializeAccessibilityNodeInfoForItem(RecyclerView.Recycler recycler, 3206 RecyclerView.State state, View host, AccessibilityNodeInfoCompat info) { 3207 ViewGroup.LayoutParams lp = host.getLayoutParams(); 3208 if (mGrid == null || !(lp instanceof LayoutParams)) { 3209 super.onInitializeAccessibilityNodeInfoForItem(recycler, state, host, info); 3210 return; 3211 } 3212 LayoutParams glp = (LayoutParams) lp; 3213 int position = glp.getViewLayoutPosition(); 3214 int rowIndex = mGrid.getRowIndex(position); 3215 int guessSpanIndex = position / mGrid.getNumRows(); 3216 if (mOrientation == HORIZONTAL) { 3217 info.setCollectionItemInfo(AccessibilityNodeInfoCompat.CollectionItemInfoCompat.obtain( 3218 rowIndex, 1, guessSpanIndex, 1, false, false)); 3219 } else { 3220 info.setCollectionItemInfo(AccessibilityNodeInfoCompat.CollectionItemInfoCompat.obtain( 3221 guessSpanIndex, 1, rowIndex, 1, false, false)); 3222 } 3223 } 3224 3225 /* 3226 * Leanback widget is different than the default implementation because the "scroll" is driven 3227 * by selection change. 3228 */ 3229 @Override 3230 public boolean performAccessibilityAction(Recycler recycler, State state, int action, 3231 Bundle args) { 3232 saveContext(recycler, state); 3233 switch (action) { 3234 case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: 3235 // try to focus all the way to the last visible item on the same row. 3236 processSelectionMoves(false, -mState.getItemCount()); 3237 break; 3238 case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: 3239 processSelectionMoves(false, mState.getItemCount()); 3240 break; 3241 } 3242 leaveContext(); 3243 return true; 3244 } 3245 3246 /* 3247 * Move mFocusPosition multiple steps on the same row in main direction. 3248 * Stops when moves are all consumed or reach first/last visible item. 3249 * Returning remaining moves. 3250 */ 3251 private int processSelectionMoves(boolean preventScroll, int moves) { 3252 if (mGrid == null) { 3253 return moves; 3254 } 3255 int focusPosition = mFocusPosition; 3256 int focusedRow = focusPosition != NO_POSITION ? 3257 mGrid.getRowIndex(focusPosition) : NO_POSITION; 3258 View newSelected = null; 3259 for (int i = 0, count = getChildCount(); i < count && moves != 0; i++) { 3260 int index = moves > 0 ? i : count - 1 - i; 3261 final View child = getChildAt(index); 3262 if (!canScrollTo(child)) { 3263 continue; 3264 } 3265 int position = getPositionByIndex(index); 3266 int rowIndex = mGrid.getRowIndex(position); 3267 if (focusedRow == NO_POSITION) { 3268 focusPosition = position; 3269 newSelected = child; 3270 focusedRow = rowIndex; 3271 } else if (rowIndex == focusedRow) { 3272 if ((moves > 0 && position > focusPosition) 3273 || (moves < 0 && position < focusPosition)) { 3274 focusPosition = position; 3275 newSelected = child; 3276 if (moves > 0) { 3277 moves--; 3278 } else { 3279 moves++; 3280 } 3281 } 3282 } 3283 } 3284 if (newSelected != null) { 3285 if (preventScroll) { 3286 if (hasFocus()) { 3287 mInSelection = true; 3288 newSelected.requestFocus(); 3289 mInSelection = false; 3290 } 3291 mFocusPosition = focusPosition; 3292 mSubFocusPosition = 0; 3293 } else { 3294 scrollToView(newSelected, true); 3295 } 3296 } 3297 return moves; 3298 } 3299 3300 @Override 3301 public void onInitializeAccessibilityNodeInfo(Recycler recycler, State state, 3302 AccessibilityNodeInfoCompat info) { 3303 saveContext(recycler, state); 3304 if (mScrollEnabled && !hasCreatedFirstItem()) { 3305 info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); 3306 info.setScrollable(true); 3307 } 3308 if (mScrollEnabled && !hasCreatedLastItem()) { 3309 info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); 3310 info.setScrollable(true); 3311 } 3312 final AccessibilityNodeInfoCompat.CollectionInfoCompat collectionInfo 3313 = AccessibilityNodeInfoCompat.CollectionInfoCompat 3314 .obtain(getRowCountForAccessibility(recycler, state), 3315 getColumnCountForAccessibility(recycler, state), 3316 isLayoutHierarchical(recycler, state), 3317 getSelectionModeForAccessibility(recycler, state)); 3318 info.setCollectionInfo(collectionInfo); 3319 leaveContext(); 3320 } 3321} 3322