GridLayoutManager.java revision 0246318f27a905a31df5a8af445cfe67d31dfb68
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.v7.widget.LinearSmoothScroller; 25import android.support.v7.widget.RecyclerView; 26import android.support.v7.widget.RecyclerView.Recycler; 27import android.support.v7.widget.RecyclerView.State; 28import android.support.v17.leanback.os.TraceHelper; 29 30import static android.support.v7.widget.RecyclerView.NO_ID; 31import static android.support.v7.widget.RecyclerView.NO_POSITION; 32import static android.support.v7.widget.RecyclerView.HORIZONTAL; 33import static android.support.v7.widget.RecyclerView.VERTICAL; 34 35import android.util.AttributeSet; 36import android.util.Log; 37import android.view.FocusFinder; 38import android.view.Gravity; 39import android.view.View; 40import android.view.ViewParent; 41import android.view.View.MeasureSpec; 42import android.view.ViewGroup.MarginLayoutParams; 43import android.view.ViewGroup; 44 45import java.io.PrintWriter; 46import java.io.StringWriter; 47import java.util.ArrayList; 48import java.util.List; 49 50final class GridLayoutManager extends RecyclerView.LayoutManager { 51 52 /* 53 * LayoutParams for {@link HorizontalGridView} and {@link VerticalGridView}. 54 * The class currently does two internal jobs: 55 * - Saves optical bounds insets. 56 * - Caches focus align view center. 57 */ 58 static class LayoutParams extends RecyclerView.LayoutParams { 59 60 // For placement 61 private int mLeftInset; 62 private int mTopInset; 63 private int mRightInset; 64 private int mBottomInset; 65 66 // For alignment 67 private int mAlignX; 68 private int mAlignY; 69 private int[] mAlignMultiple; 70 private ItemAlignmentFacet mAlignmentFacet; 71 72 public LayoutParams(Context c, AttributeSet attrs) { 73 super(c, attrs); 74 } 75 76 public LayoutParams(int width, int height) { 77 super(width, height); 78 } 79 80 public LayoutParams(MarginLayoutParams source) { 81 super(source); 82 } 83 84 public LayoutParams(ViewGroup.LayoutParams source) { 85 super(source); 86 } 87 88 public LayoutParams(RecyclerView.LayoutParams source) { 89 super(source); 90 } 91 92 public LayoutParams(LayoutParams source) { 93 super(source); 94 } 95 96 int getAlignX() { 97 return mAlignX; 98 } 99 100 int getAlignY() { 101 return mAlignY; 102 } 103 104 int getOpticalLeft(View view) { 105 return view.getLeft() + mLeftInset; 106 } 107 108 int getOpticalTop(View view) { 109 return view.getTop() + mTopInset; 110 } 111 112 int getOpticalRight(View view) { 113 return view.getRight() - mRightInset; 114 } 115 116 int getOpticalBottom(View view) { 117 return view.getBottom() - mBottomInset; 118 } 119 120 int getOpticalWidth(View view) { 121 return view.getWidth() - mLeftInset - mRightInset; 122 } 123 124 int getOpticalHeight(View view) { 125 return view.getHeight() - mTopInset - mBottomInset; 126 } 127 128 int getOpticalLeftInset() { 129 return mLeftInset; 130 } 131 132 int getOpticalRightInset() { 133 return mRightInset; 134 } 135 136 int getOpticalTopInset() { 137 return mTopInset; 138 } 139 140 int getOpticalBottomInset() { 141 return mBottomInset; 142 } 143 144 void setAlignX(int alignX) { 145 mAlignX = alignX; 146 } 147 148 void setAlignY(int alignY) { 149 mAlignY = alignY; 150 } 151 152 void setItemAlignmentFacet(ItemAlignmentFacet facet) { 153 mAlignmentFacet = facet; 154 } 155 156 ItemAlignmentFacet getItemAlignmentFacet() { 157 return mAlignmentFacet; 158 } 159 160 void calculateItemAlignments(int orientation, View view) { 161 ItemAlignmentFacet.ItemAlignmentDef[] defs = mAlignmentFacet.getAlignmentDefs(); 162 if (mAlignMultiple == null || mAlignMultiple.length != defs.length) { 163 mAlignMultiple = new int[defs.length]; 164 } 165 for (int i = 0; i < defs.length; i++) { 166 mAlignMultiple[i] = ItemAlignmentFacetHelper 167 .getAlignmentPosition(view, defs[i], orientation); 168 } 169 if (orientation == HORIZONTAL) { 170 mAlignX = mAlignMultiple[0]; 171 } else { 172 mAlignY = mAlignMultiple[0]; 173 } 174 } 175 176 int[] getAlignMultiple() { 177 return mAlignMultiple; 178 } 179 180 void setOpticalInsets(int leftInset, int topInset, int rightInset, int bottomInset) { 181 mLeftInset = leftInset; 182 mTopInset = topInset; 183 mRightInset = rightInset; 184 mBottomInset = bottomInset; 185 } 186 187 } 188 189 /** 190 * Base class which scrolls to selected view in onStop(). 191 */ 192 abstract class GridLinearSmoothScroller extends LinearSmoothScroller { 193 GridLinearSmoothScroller() { 194 super(mBaseGridView.getContext()); 195 } 196 197 @Override 198 protected void onStop() { 199 // onTargetFound() may not be called if we hit the "wall" first. 200 View targetView = findViewByPosition(getTargetPosition()); 201 if (hasFocus() && targetView != null) { 202 mInSelection = true; 203 targetView.requestFocus(); 204 mInSelection = false; 205 } 206 if (needsDispatchChildSelectedOnStop()) { 207 dispatchChildSelected(); 208 } 209 super.onStop(); 210 } 211 212 boolean needsDispatchChildSelectedOnStop() { 213 return true; 214 } 215 216 @Override 217 protected void onTargetFound(View targetView, 218 RecyclerView.State state, Action action) { 219 if (getScrollPosition(targetView, null, sTwoInts)) { 220 int dx, dy; 221 if (mOrientation == HORIZONTAL) { 222 dx = sTwoInts[0]; 223 dy = sTwoInts[1]; 224 } else { 225 dx = sTwoInts[1]; 226 dy = sTwoInts[0]; 227 } 228 final int distance = (int) Math.sqrt(dx * dx + dy * dy); 229 final int time = calculateTimeForDeceleration(distance); 230 action.update(dx, dy, time, mDecelerateInterpolator); 231 } 232 } 233 } 234 235 /** 236 * The SmoothScroller that remembers pending DPAD keys and consume pending keys 237 * during scroll. 238 */ 239 final class PendingMoveSmoothScroller extends GridLinearSmoothScroller { 240 // -2 is a target position that LinearSmoothScroller can never find until 241 // consumePendingMovesXXX() sets real targetPosition. 242 final static int TARGET_UNDEFINED = -2; 243 // whether the grid is staggered. 244 private final boolean mStaggeredGrid; 245 // Number of pending movements on primary direction, negative if PREV_ITEM. 246 private int mPendingMoves; 247 248 PendingMoveSmoothScroller(int initialPendingMoves, boolean staggeredGrid) { 249 mPendingMoves = initialPendingMoves; 250 mStaggeredGrid = staggeredGrid; 251 setTargetPosition(TARGET_UNDEFINED); 252 } 253 254 void increasePendingMoves() { 255 if (mPendingMoves < MAX_PENDING_MOVES) { 256 mPendingMoves++; 257 if (mPendingMoves == 0) { 258 dispatchChildSelected(); 259 } 260 } 261 } 262 263 void decreasePendingMoves() { 264 if (mPendingMoves > -MAX_PENDING_MOVES) { 265 mPendingMoves--; 266 if (mPendingMoves == 0) { 267 dispatchChildSelected(); 268 } 269 } 270 } 271 272 /** 273 * Called before laid out an item when non-staggered grid can handle pending movements 274 * by skipping "mNumRows" per movement; staggered grid will have to wait the item 275 * has been laid out in consumePendingMovesAfterLayout(). 276 */ 277 void consumePendingMovesBeforeLayout() { 278 if (mStaggeredGrid || mPendingMoves == 0) { 279 return; 280 } 281 View newSelected = null; 282 int startPos = mPendingMoves > 0 ? mFocusPosition + mNumRows : 283 mFocusPosition - mNumRows; 284 for (int pos = startPos; mPendingMoves != 0; 285 pos = mPendingMoves > 0 ? pos + mNumRows: pos - mNumRows) { 286 View v = findViewByPosition(pos); 287 if (v == null) { 288 break; 289 } 290 if (!canScrollTo(v)) { 291 continue; 292 } 293 newSelected = v; 294 mFocusPosition = pos; 295 mSubFocusPosition = 0; 296 if (mPendingMoves > 0) { 297 mPendingMoves--; 298 } else { 299 mPendingMoves++; 300 } 301 } 302 if (newSelected != null && hasFocus()) { 303 mInSelection = true; 304 newSelected.requestFocus(); 305 mInSelection = false; 306 } 307 } 308 309 /** 310 * Called after laid out an item. Staggered grid should find view on same 311 * Row and consume pending movements. 312 */ 313 void consumePendingMovesAfterLayout() { 314 if (mStaggeredGrid && mPendingMoves != 0) { 315 // consume pending moves, focus to item on the same row. 316 final int focusedRow = mGrid != null && mFocusPosition != NO_POSITION ? 317 mGrid.getLocation(mFocusPosition).row : NO_POSITION; 318 View newSelected = null; 319 for (int i = 0, count = getChildCount(); i < count && mPendingMoves != 0; i++) { 320 int index = mPendingMoves > 0 ? i : count - 1 - i; 321 final View child = getChildAt(index); 322 if (!canScrollTo(child)) { 323 continue; 324 } 325 int position = getPositionByIndex(index); 326 Grid.Location loc = mGrid.getLocation(position); 327 if (focusedRow == NO_POSITION || (loc != null && loc.row == focusedRow)) { 328 if (mFocusPosition == NO_POSITION) { 329 mFocusPosition = position; 330 mSubFocusPosition = 0; 331 newSelected = child; 332 } else if ((mPendingMoves > 0 && position > mFocusPosition) 333 || (mPendingMoves < 0 && position < mFocusPosition)) { 334 mFocusPosition = position; 335 mSubFocusPosition = 0; 336 if (mPendingMoves > 0) { 337 mPendingMoves--; 338 } else { 339 mPendingMoves++; 340 } 341 newSelected = child; 342 } 343 } 344 } 345 if (newSelected != null && hasFocus()) { 346 mInSelection = true; 347 newSelected.requestFocus(); 348 mInSelection = false; 349 } 350 if (mPendingMoves == 0) { 351 dispatchChildSelected(); 352 } 353 } 354 if (mPendingMoves == 0 || (mPendingMoves > 0 && hasCreatedLastItem()) 355 || (mPendingMoves < 0 && hasCreatedFirstItem())) { 356 setTargetPosition(mFocusPosition); 357 stop(); 358 } 359 } 360 361 @Override 362 protected void updateActionForInterimTarget(Action action) { 363 if (mPendingMoves == 0) { 364 return; 365 } 366 super.updateActionForInterimTarget(action); 367 } 368 369 @Override 370 public PointF computeScrollVectorForPosition(int targetPosition) { 371 if (mPendingMoves == 0) { 372 return null; 373 } 374 int direction = (mReverseFlowPrimary ? mPendingMoves > 0 : mPendingMoves < 0) ? 375 -1 : 1; 376 if (mOrientation == HORIZONTAL) { 377 return new PointF(direction, 0); 378 } else { 379 return new PointF(0, direction); 380 } 381 } 382 383 @Override 384 boolean needsDispatchChildSelectedOnStop() { 385 return mPendingMoves != 0; 386 } 387 388 @Override 389 protected void onStop() { 390 super.onStop(); 391 // if we hit wall, need clear the remaining pending moves. 392 mPendingMoves = 0; 393 mPendingMoveSmoothScroller = null; 394 View v = findViewByPosition(getTargetPosition()); 395 if (v != null) scrollToView(v, true); 396 } 397 }; 398 399 private static final String TAG = "GridLayoutManager"; 400 private static final boolean DEBUG = false; 401 private static final boolean TRACE = false; 402 403 // maximum pending movement in one direction. 404 private final static int MAX_PENDING_MOVES = 10; 405 406 private String getTag() { 407 return TAG + ":" + mBaseGridView.getId(); 408 } 409 410 private final BaseGridView mBaseGridView; 411 412 /** 413 * Note on conventions in the presence of RTL layout directions: 414 * Many properties and method names reference entities related to the 415 * beginnings and ends of things. In the presence of RTL flows, 416 * it may not be clear whether this is intended to reference a 417 * quantity that changes direction in RTL cases, or a quantity that 418 * does not. Here are the conventions in use: 419 * 420 * start/end: coordinate quantities - do reverse 421 * (optical) left/right: coordinate quantities - do not reverse 422 * low/high: coordinate quantities - do not reverse 423 * min/max: coordinate quantities - do not reverse 424 * scroll offset - coordinate quantities - do not reverse 425 * first/last: positional indices - do not reverse 426 * front/end: positional indices - do not reverse 427 * prepend/append: related to positional indices - do not reverse 428 * 429 * Note that although quantities do not reverse in RTL flows, their 430 * relationship does. In LTR flows, the first positional index is 431 * leftmost; in RTL flows, it is rightmost. Thus, anywhere that 432 * positional quantities are mapped onto coordinate quantities, 433 * the flow must be checked and the logic reversed. 434 */ 435 436 /** 437 * The orientation of a "row". 438 */ 439 private int mOrientation = HORIZONTAL; 440 441 private RecyclerView.State mState; 442 private RecyclerView.Recycler mRecycler; 443 444 private boolean mInLayout; 445 private boolean mInScroll; 446 private boolean mInFastRelayout; 447 /** 448 * During full layout pass, when GridView had focus: onLayoutChildren will 449 * skip non-focusable child and adjust mFocusPosition. 450 */ 451 private boolean mInLayoutSearchFocus; 452 private boolean mInSelection = false; 453 454 private OnChildSelectedListener mChildSelectedListener = null; 455 456 private OnChildViewHolderSelectedListener mChildViewHolderSelectedListener = null; 457 458 private OnChildLaidOutListener mChildLaidOutListener = null; 459 460 /** 461 * The focused position, it's not the currently visually aligned position 462 * but it is the final position that we intend to focus on. If there are 463 * multiple setSelection() called, mFocusPosition saves last value. 464 */ 465 private int mFocusPosition = NO_POSITION; 466 467 /** 468 * A view can have mutliple alignment position, this is the index of which 469 * alignment is used, by default is 0. 470 */ 471 private int mSubFocusPosition = 0; 472 473 /** 474 * LinearSmoothScroller that consume pending DPAD movements. 475 */ 476 private PendingMoveSmoothScroller mPendingMoveSmoothScroller; 477 478 /** 479 * The offset to be applied to mFocusPosition, due to adapter change, on the next 480 * layout. Set to Integer.MIN_VALUE means we should stop adding delta to mFocusPosition 481 * until next layout cycler. 482 * TODO: This is somewhat duplication of RecyclerView getOldPosition() which is 483 * unfortunately cleared after prelayout. 484 */ 485 private int mFocusPositionOffset = 0; 486 487 /** 488 * Extra pixels applied on primary direction. 489 */ 490 private int mPrimaryScrollExtra; 491 492 /** 493 * Force a full layout under certain situations. E.g. Rows change, jump to invisible child. 494 */ 495 private boolean mForceFullLayout; 496 497 /** 498 * True if layout is enabled. 499 */ 500 private boolean mLayoutEnabled = true; 501 502 /** 503 * override child visibility 504 */ 505 private int mChildVisibility = -1; 506 507 /** 508 * The scroll offsets of the viewport relative to the entire view. 509 */ 510 private int mScrollOffsetPrimary; 511 private int mScrollOffsetSecondary; 512 513 /** 514 * User-specified row height/column width. Can be WRAP_CONTENT. 515 */ 516 private int mRowSizeSecondaryRequested; 517 518 /** 519 * The fixed size of each grid item in the secondary direction. This corresponds to 520 * the row height, equal for all rows. Grid items may have variable length 521 * in the primary direction. 522 */ 523 private int mFixedRowSizeSecondary; 524 525 /** 526 * Tracks the secondary size of each row. 527 */ 528 private int[] mRowSizeSecondary; 529 530 /** 531 * Flag controlling whether the current/next layout should 532 * be updating the secondary size of rows. 533 */ 534 private boolean mRowSecondarySizeRefresh; 535 536 /** 537 * The maximum measured size of the view. 538 */ 539 private int mMaxSizeSecondary; 540 541 /** 542 * Margin between items. 543 */ 544 private int mHorizontalMargin; 545 /** 546 * Margin between items vertically. 547 */ 548 private int mVerticalMargin; 549 /** 550 * Margin in main direction. 551 */ 552 private int mMarginPrimary; 553 /** 554 * Margin in second direction. 555 */ 556 private int mMarginSecondary; 557 /** 558 * How to position child in secondary direction. 559 */ 560 private int mGravity = Gravity.START | Gravity.TOP; 561 /** 562 * The number of rows in the grid. 563 */ 564 private int mNumRows; 565 /** 566 * Number of rows requested, can be 0 to be determined by parent size and 567 * rowHeight. 568 */ 569 private int mNumRowsRequested = 1; 570 571 /** 572 * Saves grid information of each view. 573 */ 574 Grid mGrid; 575 576 /** 577 * Focus Scroll strategy. 578 */ 579 private int mFocusScrollStrategy = BaseGridView.FOCUS_SCROLL_ALIGNED; 580 /** 581 * Defines how item view is aligned in the window. 582 */ 583 private final WindowAlignment mWindowAlignment = new WindowAlignment(); 584 585 /** 586 * Defines how item view is aligned. 587 */ 588 private final ItemAlignment mItemAlignment = new ItemAlignment(); 589 590 /** 591 * Dimensions of the view, width or height depending on orientation. 592 */ 593 private int mSizePrimary; 594 595 /** 596 * Allow DPAD key to navigate out at the front of the View (where position = 0), 597 * default is false. 598 */ 599 private boolean mFocusOutFront; 600 601 /** 602 * Allow DPAD key to navigate out at the end of the view, default is false. 603 */ 604 private boolean mFocusOutEnd; 605 606 /** 607 * True if focus search is disabled. 608 */ 609 private boolean mFocusSearchDisabled; 610 611 /** 612 * True if prune child, might be disabled during transition. 613 */ 614 private boolean mPruneChild = true; 615 616 /** 617 * True if scroll content, might be disabled during transition. 618 */ 619 private boolean mScrollEnabled = true; 620 621 /** 622 * Temporary variable: an int array of length=2. 623 */ 624 private static int[] sTwoInts = new int[2]; 625 626 /** 627 * Set to true for RTL layout in horizontal orientation 628 */ 629 private boolean mReverseFlowPrimary = false; 630 631 /** 632 * Set to true for RTL layout in vertical orientation 633 */ 634 private boolean mReverseFlowSecondary = false; 635 636 /** 637 * Temporaries used for measuring. 638 */ 639 private int[] mMeasuredDimension = new int[2]; 640 641 final ViewsStateBundle mChildrenStates = new ViewsStateBundle(); 642 643 /** 644 * Optional interface implemented by Adapter. 645 */ 646 private FacetProviderAdapter mFacetProviderAdapter; 647 648 public GridLayoutManager(BaseGridView baseGridView) { 649 mBaseGridView = baseGridView; 650 } 651 652 public void setOrientation(int orientation) { 653 if (orientation != HORIZONTAL && orientation != VERTICAL) { 654 if (DEBUG) Log.v(getTag(), "invalid orientation: " + orientation); 655 return; 656 } 657 658 mOrientation = orientation; 659 mWindowAlignment.setOrientation(orientation); 660 mItemAlignment.setOrientation(orientation); 661 mForceFullLayout = true; 662 } 663 664 public void onRtlPropertiesChanged(int layoutDirection) { 665 if (mOrientation == HORIZONTAL) { 666 mReverseFlowPrimary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 667 mReverseFlowSecondary = false; 668 } else { 669 mReverseFlowSecondary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 670 mReverseFlowPrimary = false; 671 } 672 mWindowAlignment.horizontal.setReversedFlow(layoutDirection == View.LAYOUT_DIRECTION_RTL); 673 } 674 675 public int getFocusScrollStrategy() { 676 return mFocusScrollStrategy; 677 } 678 679 public void setFocusScrollStrategy(int focusScrollStrategy) { 680 mFocusScrollStrategy = focusScrollStrategy; 681 } 682 683 public void setWindowAlignment(int windowAlignment) { 684 mWindowAlignment.mainAxis().setWindowAlignment(windowAlignment); 685 } 686 687 public int getWindowAlignment() { 688 return mWindowAlignment.mainAxis().getWindowAlignment(); 689 } 690 691 public void setWindowAlignmentOffset(int alignmentOffset) { 692 mWindowAlignment.mainAxis().setWindowAlignmentOffset(alignmentOffset); 693 } 694 695 public int getWindowAlignmentOffset() { 696 return mWindowAlignment.mainAxis().getWindowAlignmentOffset(); 697 } 698 699 public void setWindowAlignmentOffsetPercent(float offsetPercent) { 700 mWindowAlignment.mainAxis().setWindowAlignmentOffsetPercent(offsetPercent); 701 } 702 703 public float getWindowAlignmentOffsetPercent() { 704 return mWindowAlignment.mainAxis().getWindowAlignmentOffsetPercent(); 705 } 706 707 public void setItemAlignmentOffset(int alignmentOffset) { 708 mItemAlignment.mainAxis().setItemAlignmentOffset(alignmentOffset); 709 updateChildAlignments(); 710 } 711 712 public int getItemAlignmentOffset() { 713 return mItemAlignment.mainAxis().getItemAlignmentOffset(); 714 } 715 716 public void setItemAlignmentOffsetWithPadding(boolean withPadding) { 717 mItemAlignment.mainAxis().setItemAlignmentOffsetWithPadding(withPadding); 718 updateChildAlignments(); 719 } 720 721 public boolean isItemAlignmentOffsetWithPadding() { 722 return mItemAlignment.mainAxis().isItemAlignmentOffsetWithPadding(); 723 } 724 725 public void setItemAlignmentOffsetPercent(float offsetPercent) { 726 mItemAlignment.mainAxis().setItemAlignmentOffsetPercent(offsetPercent); 727 updateChildAlignments(); 728 } 729 730 public float getItemAlignmentOffsetPercent() { 731 return mItemAlignment.mainAxis().getItemAlignmentOffsetPercent(); 732 } 733 734 public void setItemAlignmentViewId(int viewId) { 735 mItemAlignment.mainAxis().setItemAlignmentViewId(viewId); 736 updateChildAlignments(); 737 } 738 739 public int getItemAlignmentViewId() { 740 return mItemAlignment.mainAxis().getItemAlignmentViewId(); 741 } 742 743 public void setFocusOutAllowed(boolean throughFront, boolean throughEnd) { 744 mFocusOutFront = throughFront; 745 mFocusOutEnd = throughEnd; 746 } 747 748 public void setNumRows(int numRows) { 749 if (numRows < 0) throw new IllegalArgumentException(); 750 mNumRowsRequested = numRows; 751 } 752 753 /** 754 * Set the row height. May be WRAP_CONTENT, or a size in pixels. 755 */ 756 public void setRowHeight(int height) { 757 if (height >= 0 || height == ViewGroup.LayoutParams.WRAP_CONTENT) { 758 mRowSizeSecondaryRequested = height; 759 } else { 760 throw new IllegalArgumentException("Invalid row height: " + height); 761 } 762 } 763 764 public void setItemMargin(int margin) { 765 mVerticalMargin = mHorizontalMargin = margin; 766 mMarginPrimary = mMarginSecondary = margin; 767 } 768 769 public void setVerticalMargin(int margin) { 770 if (mOrientation == HORIZONTAL) { 771 mMarginSecondary = mVerticalMargin = margin; 772 } else { 773 mMarginPrimary = mVerticalMargin = margin; 774 } 775 } 776 777 public void setHorizontalMargin(int margin) { 778 if (mOrientation == HORIZONTAL) { 779 mMarginPrimary = mHorizontalMargin = margin; 780 } else { 781 mMarginSecondary = mHorizontalMargin = margin; 782 } 783 } 784 785 public int getVerticalMargin() { 786 return mVerticalMargin; 787 } 788 789 public int getHorizontalMargin() { 790 return mHorizontalMargin; 791 } 792 793 public void setGravity(int gravity) { 794 mGravity = gravity; 795 } 796 797 protected boolean hasDoneFirstLayout() { 798 return mGrid != null; 799 } 800 801 public void setOnChildSelectedListener(OnChildSelectedListener listener) { 802 mChildSelectedListener = listener; 803 } 804 805 public void setOnChildViewHolderSelectedListener(OnChildViewHolderSelectedListener listener) { 806 mChildViewHolderSelectedListener = listener; 807 } 808 809 void setOnChildLaidOutListener(OnChildLaidOutListener listener) { 810 mChildLaidOutListener = listener; 811 } 812 813 private int getPositionByView(View view) { 814 if (view == null) { 815 return NO_POSITION; 816 } 817 LayoutParams params = (LayoutParams) view.getLayoutParams(); 818 if (params == null || params.isItemRemoved()) { 819 // when item is removed, the position value can be any value. 820 return NO_POSITION; 821 } 822 return params.getViewPosition(); 823 } 824 825 private int getSubPositionByView(View view, View childView) { 826 if (view == null || childView == null) { 827 return 0; 828 } 829 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 830 final ItemAlignmentFacet facet = lp.getItemAlignmentFacet(); 831 if (facet != null) { 832 final ItemAlignmentFacet.ItemAlignmentDef[] defs = facet.getAlignmentDefs(); 833 if (defs.length > 1) { 834 while (childView != view) { 835 int id = childView.getId(); 836 if (id != View.NO_ID) { 837 for (int i = 1; i < defs.length; i++) { 838 if (defs[i].getItemAlignmentFocusViewId() == id) { 839 return i; 840 } 841 } 842 } 843 childView = (View) childView.getParent(); 844 } 845 } 846 } 847 return 0; 848 } 849 850 private int getPositionByIndex(int index) { 851 return getPositionByView(getChildAt(index)); 852 } 853 854 private void dispatchChildSelected() { 855 if (mChildSelectedListener == null && mChildViewHolderSelectedListener == null) { 856 return; 857 } 858 859 if (TRACE) TraceHelper.beginSection("onChildSelected"); 860 View view = mFocusPosition == NO_POSITION ? null : findViewByPosition(mFocusPosition); 861 if (view != null) { 862 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(view); 863 if (mChildSelectedListener != null) { 864 mChildSelectedListener.onChildSelected(mBaseGridView, view, mFocusPosition, 865 vh == null? NO_ID: vh.getItemId()); 866 } 867 if (mChildViewHolderSelectedListener != null) { 868 mChildViewHolderSelectedListener.onChildViewHolderSelected(mBaseGridView, vh, 869 mFocusPosition, mSubFocusPosition); 870 } 871 } else { 872 if (mChildSelectedListener != null) { 873 mChildSelectedListener.onChildSelected(mBaseGridView, null, NO_POSITION, NO_ID); 874 } 875 if (mChildViewHolderSelectedListener != null) { 876 mChildViewHolderSelectedListener.onChildViewHolderSelected(mBaseGridView, null, 877 NO_POSITION, 0); 878 } 879 } 880 if (TRACE) TraceHelper.endSection(); 881 882 // Children may request layout when a child selection event occurs (such as a change of 883 // padding on the current and previously selected rows). 884 // If in layout, a child requesting layout may have been laid out before the selection 885 // callback. 886 // If it was not, the child will be laid out after the selection callback. 887 // If so, the layout request will be honoured though the view system will emit a double- 888 // layout warning. 889 // If not in layout, we may be scrolling in which case the child layout request will be 890 // eaten by recyclerview. Post a requestLayout. 891 if (!mInLayout && !mBaseGridView.isLayoutRequested()) { 892 int childCount = getChildCount(); 893 for (int i = 0; i < childCount; i++) { 894 if (getChildAt(i).isLayoutRequested()) { 895 forceRequestLayout(); 896 break; 897 } 898 } 899 } 900 } 901 902 @Override 903 public boolean canScrollHorizontally() { 904 // We can scroll horizontally if we have horizontal orientation, or if 905 // we are vertical and have more than one column. 906 return mOrientation == HORIZONTAL || mNumRows > 1; 907 } 908 909 @Override 910 public boolean canScrollVertically() { 911 // We can scroll vertically if we have vertical orientation, or if we 912 // are horizontal and have more than one row. 913 return mOrientation == VERTICAL || mNumRows > 1; 914 } 915 916 @Override 917 public RecyclerView.LayoutParams generateDefaultLayoutParams() { 918 return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 919 ViewGroup.LayoutParams.WRAP_CONTENT); 920 } 921 922 @Override 923 public RecyclerView.LayoutParams generateLayoutParams(Context context, AttributeSet attrs) { 924 return new LayoutParams(context, attrs); 925 } 926 927 @Override 928 public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { 929 if (lp instanceof LayoutParams) { 930 return new LayoutParams((LayoutParams) lp); 931 } else if (lp instanceof RecyclerView.LayoutParams) { 932 return new LayoutParams((RecyclerView.LayoutParams) lp); 933 } else if (lp instanceof MarginLayoutParams) { 934 return new LayoutParams((MarginLayoutParams) lp); 935 } else { 936 return new LayoutParams(lp); 937 } 938 } 939 940 protected View getViewForPosition(int position) { 941 return mRecycler.getViewForPosition(position); 942 } 943 944 final int getOpticalLeft(View v) { 945 return ((LayoutParams) v.getLayoutParams()).getOpticalLeft(v); 946 } 947 948 final int getOpticalRight(View v) { 949 return ((LayoutParams) v.getLayoutParams()).getOpticalRight(v); 950 } 951 952 final int getOpticalTop(View v) { 953 return ((LayoutParams) v.getLayoutParams()).getOpticalTop(v); 954 } 955 956 final int getOpticalBottom(View v) { 957 return ((LayoutParams) v.getLayoutParams()).getOpticalBottom(v); 958 } 959 960 private int getViewMin(View v) { 961 return (mOrientation == HORIZONTAL) ? getOpticalLeft(v) : getOpticalTop(v); 962 } 963 964 private int getViewMax(View v) { 965 return (mOrientation == HORIZONTAL) ? getOpticalRight(v) : getOpticalBottom(v); 966 } 967 968 private int getViewPrimarySize(View view) { 969 LayoutParams p = (LayoutParams) view.getLayoutParams(); 970 return mOrientation == HORIZONTAL ? p.getOpticalWidth(view) : p.getOpticalHeight(view); 971 } 972 973 private int getViewCenter(View view) { 974 return (mOrientation == HORIZONTAL) ? getViewCenterX(view) : getViewCenterY(view); 975 } 976 977 private int getViewCenterSecondary(View view) { 978 return (mOrientation == HORIZONTAL) ? getViewCenterY(view) : getViewCenterX(view); 979 } 980 981 private int getViewCenterX(View v) { 982 LayoutParams p = (LayoutParams) v.getLayoutParams(); 983 return p.getOpticalLeft(v) + p.getAlignX(); 984 } 985 986 private int getViewCenterY(View v) { 987 LayoutParams p = (LayoutParams) v.getLayoutParams(); 988 return p.getOpticalTop(v) + p.getAlignY(); 989 } 990 991 /** 992 * Save Recycler and State for convenience. Must be paired with leaveContext(). 993 */ 994 private void saveContext(Recycler recycler, State state) { 995 if (mRecycler != null || mState != null) { 996 Log.e(TAG, "Recycler information was not released, bug!"); 997 } 998 mRecycler = recycler; 999 mState = state; 1000 } 1001 1002 /** 1003 * Discard saved Recycler and State. 1004 */ 1005 private void leaveContext() { 1006 mRecycler = null; 1007 mState = null; 1008 } 1009 1010 /** 1011 * Re-initialize data structures for a data change or handling invisible 1012 * selection. The method tries its best to preserve position information so 1013 * that staggered grid looks same before and after re-initialize. 1014 * @return true if can fastRelayout() 1015 */ 1016 private boolean layoutInit() { 1017 boolean focusViewWasInTree = mGrid != null && mFocusPosition >= 0 1018 && mFocusPosition >= mGrid.getFirstVisibleIndex() 1019 && mFocusPosition <= mGrid.getLastVisibleIndex(); 1020 final int newItemCount = mState.getItemCount(); 1021 if (newItemCount == 0) { 1022 mFocusPosition = NO_POSITION; 1023 mSubFocusPosition = 0; 1024 } else if (mFocusPosition >= newItemCount) { 1025 mFocusPosition = newItemCount - 1; 1026 mSubFocusPosition = 0; 1027 } else if (mFocusPosition == NO_POSITION && newItemCount > 0) { 1028 // if focus position is never set before, initialize it to 0 1029 mFocusPosition = 0; 1030 mSubFocusPosition = 0; 1031 } 1032 if (!mState.didStructureChange() && mGrid.getFirstVisibleIndex() >= 0 && 1033 !mForceFullLayout && mGrid != null && mGrid.getNumRows() == mNumRows) { 1034 updateScrollController(); 1035 updateScrollSecondAxis(); 1036 mGrid.setMargin(mMarginPrimary); 1037 if (!focusViewWasInTree && mFocusPosition != NO_POSITION) { 1038 mGrid.setStart(mFocusPosition); 1039 } 1040 return true; 1041 } else { 1042 mForceFullLayout = false; 1043 int firstVisibleIndex = focusViewWasInTree ? mGrid.getFirstVisibleIndex() : 0; 1044 1045 if (mGrid == null || mNumRows != mGrid.getNumRows() || 1046 mReverseFlowPrimary != mGrid.isReversedFlow()) { 1047 mGrid = Grid.createStaggeredMultipleRows(mNumRows); 1048 mGrid.setProvider(mGridProvider); 1049 mGrid.setReversedFlow(mReverseFlowPrimary); 1050 } 1051 initScrollController(); 1052 updateScrollSecondAxis(); 1053 mGrid.setMargin(mMarginPrimary); 1054 detachAndScrapAttachedViews(mRecycler); 1055 mGrid.resetVisibleIndex(); 1056 if (mFocusPosition == NO_POSITION) { 1057 mBaseGridView.clearFocus(); 1058 } 1059 mWindowAlignment.mainAxis().invalidateScrollMin(); 1060 mWindowAlignment.mainAxis().invalidateScrollMax(); 1061 if (focusViewWasInTree && firstVisibleIndex <= mFocusPosition) { 1062 // if focusView was in tree, we will add item from first visible item 1063 mGrid.setStart(firstVisibleIndex); 1064 } else { 1065 // if focusView was not in tree, it's probably because focus position jumped 1066 // far away from visible range, so use mFocusPosition as start 1067 mGrid.setStart(mFocusPosition); 1068 } 1069 return false; 1070 } 1071 } 1072 1073 private int getRowSizeSecondary(int rowIndex) { 1074 if (mFixedRowSizeSecondary != 0) { 1075 return mFixedRowSizeSecondary; 1076 } 1077 if (mRowSizeSecondary == null) { 1078 return 0; 1079 } 1080 return mRowSizeSecondary[rowIndex]; 1081 } 1082 1083 private int getRowStartSecondary(int rowIndex) { 1084 int start = 0; 1085 // Iterate from left to right, which is a different index traversal 1086 // in RTL flow 1087 if (mReverseFlowSecondary) { 1088 for (int i = mNumRows-1; i > rowIndex; i--) { 1089 start += getRowSizeSecondary(i) + mMarginSecondary; 1090 } 1091 } else { 1092 for (int i = 0; i < rowIndex; i++) { 1093 start += getRowSizeSecondary(i) + mMarginSecondary; 1094 } 1095 } 1096 return start; 1097 } 1098 1099 private int getSizeSecondary() { 1100 int rightmostIndex = mReverseFlowSecondary ? 0 : mNumRows - 1; 1101 return getRowStartSecondary(rightmostIndex) + getRowSizeSecondary(rightmostIndex); 1102 } 1103 1104 private void measureScrapChild(int position, int widthSpec, int heightSpec, 1105 int[] measuredDimension) { 1106 View view = mRecycler.getViewForPosition(position); 1107 if (view != null) { 1108 LayoutParams p = (LayoutParams) view.getLayoutParams(); 1109 int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, 1110 getPaddingLeft() + getPaddingRight(), p.width); 1111 int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, 1112 getPaddingTop() + getPaddingBottom(), p.height); 1113 view.measure(childWidthSpec, childHeightSpec); 1114 measuredDimension[0] = view.getMeasuredWidth(); 1115 measuredDimension[1] = view.getMeasuredHeight(); 1116 mRecycler.recycleView(view); 1117 } 1118 } 1119 1120 private boolean processRowSizeSecondary(boolean measure) { 1121 if (mFixedRowSizeSecondary != 0 || mRowSizeSecondary == null) { 1122 return false; 1123 } 1124 1125 if (TRACE) TraceHelper.beginSection("processRowSizeSecondary"); 1126 CircularIntArray[] rows = mGrid == null ? null : mGrid.getItemPositionsInRows(); 1127 boolean changed = false; 1128 int scrapChildWidth = -1; 1129 int scrapChildHeight = -1; 1130 1131 for (int rowIndex = 0; rowIndex < mNumRows; rowIndex++) { 1132 CircularIntArray row = rows == null ? null : rows[rowIndex]; 1133 final int rowItemsPairCount = row == null ? 0 : row.size(); 1134 int rowSize = -1; 1135 for (int rowItemPairIndex = 0; rowItemPairIndex < rowItemsPairCount; 1136 rowItemPairIndex += 2) { 1137 final int rowIndexStart = row.get(rowItemPairIndex); 1138 final int rowIndexEnd = row.get(rowItemPairIndex + 1); 1139 for (int i = rowIndexStart; i <= rowIndexEnd; i++) { 1140 final View view = findViewByPosition(i); 1141 if (view == null) { 1142 continue; 1143 } 1144 if (measure && view.isLayoutRequested()) { 1145 measureChild(view); 1146 } 1147 final int secondarySize = mOrientation == HORIZONTAL ? 1148 view.getMeasuredHeight() : view.getMeasuredWidth(); 1149 if (secondarySize > rowSize) { 1150 rowSize = secondarySize; 1151 } 1152 } 1153 } 1154 1155 final int itemCount = mState.getItemCount(); 1156 if (measure && rowSize < 0 && itemCount > 0) { 1157 if (scrapChildWidth < 0 && scrapChildHeight < 0) { 1158 int position; 1159 if (mFocusPosition == NO_POSITION) { 1160 position = 0; 1161 } else if (mFocusPosition >= itemCount) { 1162 position = itemCount - 1; 1163 } else { 1164 position = mFocusPosition; 1165 } 1166 measureScrapChild(position, 1167 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1168 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1169 mMeasuredDimension); 1170 scrapChildWidth = mMeasuredDimension[0]; 1171 scrapChildHeight = mMeasuredDimension[1]; 1172 if (DEBUG) Log.v(TAG, "measured scrap child: " + scrapChildWidth + 1173 " " + scrapChildHeight); 1174 } 1175 rowSize = mOrientation == HORIZONTAL ? scrapChildHeight : scrapChildWidth; 1176 } 1177 if (rowSize < 0) { 1178 rowSize = 0; 1179 } 1180 if (mRowSizeSecondary[rowIndex] != rowSize) { 1181 if (DEBUG) Log.v(getTag(), "row size secondary changed: " + mRowSizeSecondary[rowIndex] + 1182 ", " + rowSize); 1183 mRowSizeSecondary[rowIndex] = rowSize; 1184 changed = true; 1185 } 1186 } 1187 1188 if (TRACE) TraceHelper.endSection(); 1189 return changed; 1190 } 1191 1192 /** 1193 * Checks if we need to update row secondary sizes. 1194 */ 1195 private void updateRowSecondarySizeRefresh() { 1196 mRowSecondarySizeRefresh = processRowSizeSecondary(false); 1197 if (mRowSecondarySizeRefresh) { 1198 if (DEBUG) Log.v(getTag(), "mRowSecondarySizeRefresh now set"); 1199 forceRequestLayout(); 1200 } 1201 } 1202 1203 private void forceRequestLayout() { 1204 if (DEBUG) Log.v(getTag(), "forceRequestLayout"); 1205 // RecyclerView prevents us from requesting layout in many cases 1206 // (during layout, during scroll, etc.) 1207 // For secondary row size wrap_content support we currently need a 1208 // second layout pass to update the measured size after having measured 1209 // and added child views in layoutChildren. 1210 // Force the second layout by posting a delayed runnable. 1211 // TODO: investigate allowing a second layout pass, 1212 // or move child add/measure logic to the measure phase. 1213 ViewCompat.postOnAnimation(mBaseGridView, mRequestLayoutRunnable); 1214 } 1215 1216 private final Runnable mRequestLayoutRunnable = new Runnable() { 1217 @Override 1218 public void run() { 1219 if (DEBUG) Log.v(getTag(), "request Layout from runnable"); 1220 requestLayout(); 1221 } 1222 }; 1223 1224 @Override 1225 public void onMeasure(Recycler recycler, State state, int widthSpec, int heightSpec) { 1226 saveContext(recycler, state); 1227 1228 int sizePrimary, sizeSecondary, modeSecondary, paddingSecondary; 1229 int measuredSizeSecondary; 1230 if (mOrientation == HORIZONTAL) { 1231 sizePrimary = MeasureSpec.getSize(widthSpec); 1232 sizeSecondary = MeasureSpec.getSize(heightSpec); 1233 modeSecondary = MeasureSpec.getMode(heightSpec); 1234 paddingSecondary = getPaddingTop() + getPaddingBottom(); 1235 } else { 1236 sizeSecondary = MeasureSpec.getSize(widthSpec); 1237 sizePrimary = MeasureSpec.getSize(heightSpec); 1238 modeSecondary = MeasureSpec.getMode(widthSpec); 1239 paddingSecondary = getPaddingLeft() + getPaddingRight(); 1240 } 1241 if (DEBUG) Log.v(getTag(), "onMeasure widthSpec " + Integer.toHexString(widthSpec) + 1242 " heightSpec " + Integer.toHexString(heightSpec) + 1243 " modeSecondary " + Integer.toHexString(modeSecondary) + 1244 " sizeSecondary " + sizeSecondary + " " + this); 1245 1246 mMaxSizeSecondary = sizeSecondary; 1247 1248 if (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) { 1249 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1250 mFixedRowSizeSecondary = 0; 1251 1252 if (mRowSizeSecondary == null || mRowSizeSecondary.length != mNumRows) { 1253 mRowSizeSecondary = new int[mNumRows]; 1254 } 1255 1256 // Measure all current children and update cached row heights 1257 processRowSizeSecondary(true); 1258 1259 switch (modeSecondary) { 1260 case MeasureSpec.UNSPECIFIED: 1261 measuredSizeSecondary = getSizeSecondary() + paddingSecondary; 1262 break; 1263 case MeasureSpec.AT_MOST: 1264 measuredSizeSecondary = Math.min(getSizeSecondary() + paddingSecondary, 1265 mMaxSizeSecondary); 1266 break; 1267 case MeasureSpec.EXACTLY: 1268 measuredSizeSecondary = mMaxSizeSecondary; 1269 break; 1270 default: 1271 throw new IllegalStateException("wrong spec"); 1272 } 1273 1274 } else { 1275 switch (modeSecondary) { 1276 case MeasureSpec.UNSPECIFIED: 1277 if (mRowSizeSecondaryRequested == 0) { 1278 if (mOrientation == HORIZONTAL) { 1279 throw new IllegalStateException("Must specify rowHeight or view height"); 1280 } else { 1281 throw new IllegalStateException("Must specify columnWidth or view width"); 1282 } 1283 } 1284 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1285 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1286 measuredSizeSecondary = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1287 * (mNumRows - 1) + paddingSecondary; 1288 break; 1289 case MeasureSpec.AT_MOST: 1290 case MeasureSpec.EXACTLY: 1291 if (mNumRowsRequested == 0 && mRowSizeSecondaryRequested == 0) { 1292 mNumRows = 1; 1293 mFixedRowSizeSecondary = sizeSecondary - paddingSecondary; 1294 } else if (mNumRowsRequested == 0) { 1295 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1296 mNumRows = (sizeSecondary + mMarginSecondary) 1297 / (mRowSizeSecondaryRequested + mMarginSecondary); 1298 } else if (mRowSizeSecondaryRequested == 0) { 1299 mNumRows = mNumRowsRequested; 1300 mFixedRowSizeSecondary = (sizeSecondary - paddingSecondary - mMarginSecondary 1301 * (mNumRows - 1)) / mNumRows; 1302 } else { 1303 mNumRows = mNumRowsRequested; 1304 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1305 } 1306 measuredSizeSecondary = sizeSecondary; 1307 if (modeSecondary == MeasureSpec.AT_MOST) { 1308 int childrenSize = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1309 * (mNumRows - 1) + paddingSecondary; 1310 if (childrenSize < measuredSizeSecondary) { 1311 measuredSizeSecondary = childrenSize; 1312 } 1313 } 1314 break; 1315 default: 1316 throw new IllegalStateException("wrong spec"); 1317 } 1318 } 1319 if (mOrientation == HORIZONTAL) { 1320 setMeasuredDimension(sizePrimary, measuredSizeSecondary); 1321 } else { 1322 setMeasuredDimension(measuredSizeSecondary, sizePrimary); 1323 } 1324 if (DEBUG) { 1325 Log.v(getTag(), "onMeasure sizePrimary " + sizePrimary + 1326 " measuredSizeSecondary " + measuredSizeSecondary + 1327 " mFixedRowSizeSecondary " + mFixedRowSizeSecondary + 1328 " mNumRows " + mNumRows); 1329 } 1330 leaveContext(); 1331 } 1332 1333 private void measureChild(View child) { 1334 if (TRACE) TraceHelper.beginSection("measureChild"); 1335 final ViewGroup.LayoutParams lp = child.getLayoutParams(); 1336 final int secondarySpec = (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) ? 1337 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) : 1338 MeasureSpec.makeMeasureSpec(mFixedRowSizeSecondary, MeasureSpec.EXACTLY); 1339 int widthSpec, heightSpec; 1340 1341 if (mOrientation == HORIZONTAL) { 1342 widthSpec = ViewGroup.getChildMeasureSpec( 1343 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1344 0, lp.width); 1345 heightSpec = ViewGroup.getChildMeasureSpec(secondarySpec, 0, lp.height); 1346 } else { 1347 heightSpec = ViewGroup.getChildMeasureSpec( 1348 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1349 0, lp.height); 1350 widthSpec = ViewGroup.getChildMeasureSpec(secondarySpec, 0, lp.width); 1351 } 1352 child.measure(widthSpec, heightSpec); 1353 if (DEBUG) Log.v(getTag(), "measureChild secondarySpec " + Integer.toHexString(secondarySpec) + 1354 " widthSpec " + Integer.toHexString(widthSpec) + 1355 " heightSpec " + Integer.toHexString(heightSpec) + 1356 " measuredWidth " + child.getMeasuredWidth() + 1357 " measuredHeight " + child.getMeasuredHeight()); 1358 if (DEBUG) Log.v(getTag(), "child lp width " + lp.width + " height " + lp.height); 1359 if (TRACE) TraceHelper.endSection(); 1360 } 1361 1362 /** 1363 * Get facet from the ViewHolder or the viewType. 1364 */ 1365 private <E> E getFacet(RecyclerView.ViewHolder vh, Class<? extends E> facetClass) { 1366 E facet = null; 1367 if (vh instanceof FacetProvider) { 1368 facet = (E) ((FacetProvider) vh).getFacet(facetClass); 1369 } 1370 if (facet == null && mFacetProviderAdapter != null) { 1371 FacetProvider p = mFacetProviderAdapter.getFacetProvider(vh.getItemViewType()); 1372 if (p != null) { 1373 facet = (E) p.getFacet(facetClass); 1374 } 1375 } 1376 return facet; 1377 } 1378 1379 private Grid.Provider mGridProvider = new Grid.Provider() { 1380 1381 @Override 1382 public int getCount() { 1383 return mState.getItemCount(); 1384 } 1385 1386 @Override 1387 public int createItem(int index, boolean append, Object[] item) { 1388 if (TRACE) TraceHelper.beginSection("createItem"); 1389 if (TRACE) TraceHelper.beginSection("getview"); 1390 View v = getViewForPosition(index); 1391 if (TRACE) TraceHelper.endSection(); 1392 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1393 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1394 lp.setItemAlignmentFacet((ItemAlignmentFacet)getFacet(vh, ItemAlignmentFacet.class)); 1395 // See recyclerView docs: we don't need re-add scraped view if it was removed. 1396 if (!lp.isItemRemoved()) { 1397 if (TRACE) TraceHelper.beginSection("addView"); 1398 if (append) { 1399 addView(v); 1400 } else { 1401 addView(v, 0); 1402 } 1403 if (TRACE) TraceHelper.endSection(); 1404 if (mChildVisibility != -1) { 1405 v.setVisibility(mChildVisibility); 1406 } 1407 1408 if (mPendingMoveSmoothScroller != null) { 1409 mPendingMoveSmoothScroller.consumePendingMovesBeforeLayout(); 1410 } 1411 int subindex = getSubPositionByView(v, v.findFocus()); 1412 if (!mInLayout) { 1413 // when we are appending item during scroll pass and the item's position 1414 // matches the mFocusPosition, we should signal a childSelected event. 1415 // However if we are still running PendingMoveSmoothScroller, we defer and 1416 // signal the event in PendingMoveSmoothScroller.onStop(). This can 1417 // avoid lots of childSelected events during a long smooth scrolling and 1418 // increase performance. 1419 if (index == mFocusPosition && subindex == mSubFocusPosition 1420 && (mPendingMoveSmoothScroller == null 1421 || mPendingMoveSmoothScroller.mPendingMoves == 0)) { 1422 dispatchChildSelected(); 1423 } 1424 } else if (!mInFastRelayout) { 1425 // fastRelayout will dispatch event at end of onLayoutChildren(). 1426 // For full layout, two situations here: 1427 // 1. mInLayoutSearchFocus is false, dispatchChildSelected() at mFocusPosition. 1428 // 2. mInLayoutSearchFocus is true: dispatchChildSelected() on first child 1429 // equal to or after mFocusPosition that can take focus. 1430 if (!mInLayoutSearchFocus && index == mFocusPosition 1431 && subindex == mSubFocusPosition) { 1432 dispatchChildSelected(); 1433 } else if (mInLayoutSearchFocus && index >= mFocusPosition 1434 && v.hasFocusable()) { 1435 mFocusPosition = index; 1436 mSubFocusPosition = subindex; 1437 mInLayoutSearchFocus = false; 1438 dispatchChildSelected(); 1439 } 1440 } 1441 measureChild(v); 1442 } 1443 item[0] = v; 1444 return mOrientation == HORIZONTAL ? v.getMeasuredWidth() : v.getMeasuredHeight(); 1445 } 1446 1447 @Override 1448 public void addItem(Object item, int index, int length, int rowIndex, int edge) { 1449 View v = (View) item; 1450 int start, end; 1451 if (edge == Integer.MIN_VALUE || edge == Integer.MAX_VALUE) { 1452 edge = !mGrid.isReversedFlow() ? mWindowAlignment.mainAxis().getPaddingLow() 1453 : mWindowAlignment.mainAxis().getSize() 1454 - mWindowAlignment.mainAxis().getPaddingHigh(); 1455 } 1456 boolean edgeIsMin = !mGrid.isReversedFlow(); 1457 if (edgeIsMin) { 1458 start = edge; 1459 end = edge + length; 1460 } else { 1461 start = edge - length; 1462 end = edge; 1463 } 1464 int startSecondary = getRowStartSecondary(rowIndex) - mScrollOffsetSecondary; 1465 mChildrenStates.loadView(v, index); 1466 layoutChild(rowIndex, v, start, end, startSecondary); 1467 if (DEBUG) { 1468 Log.d(getTag(), "addView " + index + " " + v); 1469 } 1470 if (TRACE) TraceHelper.endSection(); 1471 1472 if (index == mGrid.getFirstVisibleIndex()) { 1473 if (!mGrid.isReversedFlow()) { 1474 updateScrollMin(); 1475 } else { 1476 updateScrollMax(); 1477 } 1478 } 1479 if (index == mGrid.getLastVisibleIndex()) { 1480 if (!mGrid.isReversedFlow()) { 1481 updateScrollMax(); 1482 } else { 1483 updateScrollMin(); 1484 } 1485 } 1486 if (!mInLayout && mPendingMoveSmoothScroller != null) { 1487 mPendingMoveSmoothScroller.consumePendingMovesAfterLayout(); 1488 } 1489 if (mChildLaidOutListener != null) { 1490 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1491 mChildLaidOutListener.onChildLaidOut(mBaseGridView, v, index, 1492 vh == null ? NO_ID : vh.getItemId()); 1493 } 1494 } 1495 1496 @Override 1497 public void removeItem(int index) { 1498 if (TRACE) TraceHelper.beginSection("removeItem"); 1499 View v = findViewByPosition(index); 1500 if (mInLayout) { 1501 detachAndScrapView(v, mRecycler); 1502 } else { 1503 removeAndRecycleView(v, mRecycler); 1504 } 1505 if (TRACE) TraceHelper.endSection(); 1506 } 1507 1508 @Override 1509 public int getEdge(int index) { 1510 if (mReverseFlowPrimary) { 1511 return getViewMax(findViewByPosition(index)); 1512 } else { 1513 return getViewMin(findViewByPosition(index)); 1514 } 1515 } 1516 1517 @Override 1518 public int getSize(int index) { 1519 return getViewPrimarySize(findViewByPosition(index)); 1520 } 1521 }; 1522 1523 private void layoutChild(int rowIndex, View v, int start, int end, int startSecondary) { 1524 if (TRACE) TraceHelper.beginSection("layoutChild"); 1525 int sizeSecondary = mOrientation == HORIZONTAL ? v.getMeasuredHeight() 1526 : v.getMeasuredWidth(); 1527 if (mFixedRowSizeSecondary > 0) { 1528 sizeSecondary = Math.min(sizeSecondary, mFixedRowSizeSecondary); 1529 } 1530 final int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; 1531 final int horizontalGravity = (mReverseFlowPrimary || mReverseFlowSecondary) ? 1532 Gravity.getAbsoluteGravity(mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK, View.LAYOUT_DIRECTION_RTL) : 1533 mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; 1534 if (mOrientation == HORIZONTAL && verticalGravity == Gravity.TOP 1535 || mOrientation == VERTICAL && horizontalGravity == Gravity.LEFT) { 1536 // do nothing 1537 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.BOTTOM 1538 || mOrientation == VERTICAL && horizontalGravity == Gravity.RIGHT) { 1539 startSecondary += getRowSizeSecondary(rowIndex) - sizeSecondary; 1540 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.CENTER_VERTICAL 1541 || mOrientation == VERTICAL && horizontalGravity == Gravity.CENTER_HORIZONTAL) { 1542 startSecondary += (getRowSizeSecondary(rowIndex) - sizeSecondary) / 2; 1543 } 1544 int left, top, right, bottom; 1545 if (mOrientation == HORIZONTAL) { 1546 left = start; 1547 top = startSecondary; 1548 right = end; 1549 bottom = startSecondary + sizeSecondary; 1550 } else { 1551 top = start; 1552 left = startSecondary; 1553 bottom = end; 1554 right = startSecondary + sizeSecondary; 1555 } 1556 v.layout(left, top, right, bottom); 1557 updateChildOpticalInsets(v, left, top, right, bottom); 1558 updateChildAlignments(v); 1559 if (TRACE) TraceHelper.endSection(); 1560 } 1561 1562 private void updateChildOpticalInsets(View v, int left, int top, int right, int bottom) { 1563 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1564 p.setOpticalInsets(left - v.getLeft(), top - v.getTop(), 1565 v.getRight() - right, v.getBottom() - bottom); 1566 } 1567 1568 private void updateChildAlignments(View v) { 1569 final LayoutParams p = (LayoutParams) v.getLayoutParams(); 1570 if (p.getItemAlignmentFacet() == null) { 1571 // Fallback to global settings on grid view 1572 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1573 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1574 } else { 1575 // Use ItemAlignmentFacet defined on specific ViewHolder 1576 p.calculateItemAlignments(mOrientation, v); 1577 if (mOrientation == HORIZONTAL) { 1578 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1579 } else { 1580 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1581 } 1582 } 1583 } 1584 1585 private void updateChildAlignments() { 1586 for (int i = 0, c = getChildCount(); i < c; i++) { 1587 updateChildAlignments(getChildAt(i)); 1588 } 1589 } 1590 1591 private void removeInvisibleViewsAtEnd() { 1592 if (mPruneChild) { 1593 mGrid.removeInvisibleItemsAtEnd(mFocusPosition, 1594 mReverseFlowPrimary ? 0 : mSizePrimary); 1595 } 1596 } 1597 1598 private void removeInvisibleViewsAtFront() { 1599 if (mPruneChild) { 1600 mGrid.removeInvisibleItemsAtFront(mFocusPosition, 1601 mReverseFlowPrimary ? mSizePrimary : 0); 1602 } 1603 } 1604 1605 private boolean appendOneColumnVisibleItems() { 1606 return mGrid.appendOneColumnVisibleItems(); 1607 } 1608 1609 private boolean prependOneColumnVisibleItems() { 1610 return mGrid.prependOneColumnVisibleItems(); 1611 } 1612 1613 private void appendVisibleItems() { 1614 mGrid.appendVisibleItems(mReverseFlowPrimary ? 0 : mSizePrimary); 1615 } 1616 1617 private void prependVisibleItems() { 1618 mGrid.prependVisibleItems(mReverseFlowPrimary ? mSizePrimary : 0); 1619 } 1620 1621 /** 1622 * Fast layout when there is no structure change, adapter change, etc. 1623 * It will layout all views was layout requested or updated, until hit a view 1624 * with different size, then it break and detachAndScrap all views after that. 1625 */ 1626 private void fastRelayout() { 1627 boolean invalidateAfter = false; 1628 final int childCount = getChildCount(); 1629 int position = -1; 1630 for (int index = 0; index < childCount; index++) { 1631 View view = getChildAt(index); 1632 position = getPositionByIndex(index); 1633 Grid.Location location = mGrid.getLocation(position); 1634 if (location == null) { 1635 if (DEBUG) Log.w(getTag(), "fastRelayout(): no Location at " + position); 1636 invalidateAfter = true; 1637 break; 1638 } 1639 1640 int startSecondary = getRowStartSecondary(location.row) - mScrollOffsetSecondary; 1641 int primarySize, end; 1642 int start = getViewMin(view); 1643 int oldPrimarySize = getViewPrimarySize(view); 1644 1645 LayoutParams lp = (LayoutParams) view.getLayoutParams(); 1646 if (lp.viewNeedsUpdate()) { 1647 int viewIndex = mBaseGridView.indexOfChild(view); 1648 detachAndScrapView(view, mRecycler); 1649 view = getViewForPosition(position); 1650 addView(view, viewIndex); 1651 } 1652 1653 if (view.isLayoutRequested()) { 1654 measureChild(view); 1655 } 1656 if (mOrientation == HORIZONTAL) { 1657 primarySize = view.getMeasuredWidth(); 1658 end = start + primarySize; 1659 } else { 1660 primarySize = view.getMeasuredHeight(); 1661 end = start + primarySize; 1662 } 1663 layoutChild(location.row, view, start, end, startSecondary); 1664 if (oldPrimarySize != primarySize) { 1665 // size changed invalidate remaining Locations 1666 if (DEBUG) Log.d(getTag(), "fastRelayout: view size changed at " + position); 1667 invalidateAfter = true; 1668 break; 1669 } 1670 } 1671 if (invalidateAfter) { 1672 final int savedLastPos = mGrid.getLastVisibleIndex(); 1673 mGrid.invalidateItemsAfter(position); 1674 if (mPruneChild) { 1675 // in regular prune child mode, we just append items up to edge limit 1676 appendVisibleItems(); 1677 if (mFocusPosition >= 0 && mFocusPosition <= savedLastPos) { 1678 // make sure add focus view back: the view might be outside edge limit 1679 // when there is delta in onLayoutChildren(). 1680 while (mGrid.getLastVisibleIndex() < mFocusPosition) { 1681 mGrid.appendOneColumnVisibleItems(); 1682 } 1683 } 1684 } else { 1685 // prune disabled(e.g. in RowsFragment transition): append all removed items 1686 while (mGrid.appendOneColumnVisibleItems() 1687 && mGrid.getLastVisibleIndex() < savedLastPos); 1688 } 1689 } 1690 updateScrollMin(); 1691 updateScrollMax(); 1692 updateScrollSecondAxis(); 1693 } 1694 1695 public void removeAndRecycleAllViews(RecyclerView.Recycler recycler) { 1696 if (TRACE) TraceHelper.beginSection("removeAndRecycleAllViews"); 1697 if (DEBUG) Log.v(TAG, "removeAndRecycleAllViews " + getChildCount()); 1698 for (int i = getChildCount() - 1; i >= 0; i--) { 1699 removeAndRecycleViewAt(i, recycler); 1700 } 1701 if (TRACE) TraceHelper.endSection(); 1702 } 1703 1704 // Lays out items based on the current scroll position 1705 @Override 1706 public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { 1707 if (DEBUG) { 1708 Log.v(getTag(), "layoutChildren start numRows " + mNumRows + " mScrollOffsetSecondary " 1709 + mScrollOffsetSecondary + " mScrollOffsetPrimary " + mScrollOffsetPrimary 1710 + " inPreLayout " + state.isPreLayout() 1711 + " didStructureChange " + state.didStructureChange() 1712 + " mForceFullLayout " + mForceFullLayout); 1713 Log.v(getTag(), "width " + getWidth() + " height " + getHeight()); 1714 } 1715 1716 if (mNumRows == 0) { 1717 // haven't done measure yet 1718 return; 1719 } 1720 final int itemCount = state.getItemCount(); 1721 if (itemCount < 0) { 1722 return; 1723 } 1724 1725 if (!mLayoutEnabled) { 1726 discardLayoutInfo(); 1727 removeAndRecycleAllViews(recycler); 1728 return; 1729 } 1730 mInLayout = true; 1731 1732 final boolean scrollToFocus = !isSmoothScrolling() 1733 && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED; 1734 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 1735 mFocusPosition = mFocusPosition + mFocusPositionOffset; 1736 mSubFocusPosition = 0; 1737 } 1738 mFocusPositionOffset = 0; 1739 saveContext(recycler, state); 1740 1741 // Track the old focus view so we can adjust our system scroll position 1742 // so that any scroll animations happening now will remain valid. 1743 // We must use same delta in Pre Layout (if prelayout exists) and second layout. 1744 // So we cache the deltas in PreLayout and use it in second layout. 1745 int delta = 0, deltaSecondary = 0; 1746 if (mFocusPosition != NO_POSITION && scrollToFocus 1747 && mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) { 1748 // FIXME: we should get the remaining scroll animation offset from RecyclerView 1749 View focusView = findViewByPosition(mFocusPosition); 1750 if (focusView != null) { 1751 getScrollPosition(focusView, focusView.findFocus(), sTwoInts); 1752 delta = sTwoInts[0]; 1753 deltaSecondary = sTwoInts[1]; 1754 } 1755 } 1756 1757 boolean hadFocus = mBaseGridView.hasFocus(); 1758 int savedFocusPos = mFocusPosition; 1759 if (mInFastRelayout = layoutInit()) { 1760 fastRelayout(); 1761 // appends items till focus position. 1762 if (mFocusPosition != NO_POSITION) { 1763 View focusView = findViewByPosition(mFocusPosition); 1764 if (focusView != null) { 1765 if (scrollToFocus) { 1766 scrollToView(focusView, false); 1767 } 1768 if (hadFocus && !focusView.hasFocus()) { 1769 focusView.requestFocus(); 1770 } 1771 } 1772 } 1773 } else { 1774 mInLayoutSearchFocus = hadFocus; 1775 if (mFocusPosition != NO_POSITION) { 1776 // appends items till focus position. 1777 while (appendOneColumnVisibleItems() 1778 && findViewByPosition(mFocusPosition) == null) ; 1779 } 1780 // multiple rounds: scrollToView of first round may drag first/last child into 1781 // "visible window" and we update scrollMin/scrollMax then run second scrollToView 1782 int oldFirstVisible; 1783 int oldLastVisible; 1784 do { 1785 updateScrollMin(); 1786 updateScrollMax(); 1787 oldFirstVisible = mGrid.getFirstVisibleIndex(); 1788 oldLastVisible = mGrid.getLastVisibleIndex(); 1789 View focusView = findViewByPosition(mFocusPosition); 1790 // we need force to initialize the child view's position 1791 scrollToView(focusView, false); 1792 if (focusView != null && hadFocus && !focusView.hasFocus()) { 1793 focusView.requestFocus(); 1794 } 1795 appendVisibleItems(); 1796 prependVisibleItems(); 1797 removeInvisibleViewsAtFront(); 1798 removeInvisibleViewsAtEnd(); 1799 } while (mGrid.getFirstVisibleIndex() != oldFirstVisible || 1800 mGrid.getLastVisibleIndex() != oldLastVisible); 1801 } 1802 1803 if (scrollToFocus) { 1804 scrollDirectionPrimary(-delta); 1805 scrollDirectionSecondary(-deltaSecondary); 1806 } 1807 appendVisibleItems(); 1808 prependVisibleItems(); 1809 removeInvisibleViewsAtFront(); 1810 removeInvisibleViewsAtEnd(); 1811 1812 if (DEBUG) { 1813 StringWriter sw = new StringWriter(); 1814 PrintWriter pw = new PrintWriter(sw); 1815 mGrid.debugPrint(pw); 1816 Log.d(getTag(), sw.toString()); 1817 } 1818 1819 if (mRowSecondarySizeRefresh) { 1820 mRowSecondarySizeRefresh = false; 1821 } else { 1822 updateRowSecondarySizeRefresh(); 1823 } 1824 1825 // For fastRelayout, only dispatch event when focus position changes. 1826 if (mInFastRelayout && mFocusPosition != savedFocusPos) { 1827 dispatchChildSelected(); 1828 } else if (!mInFastRelayout && mInLayoutSearchFocus) { 1829 // For full layout we dispatchChildSelected() in createItem() unless searched all 1830 // children and found none is focusable then dispatchChildSelected() here. 1831 dispatchChildSelected(); 1832 } 1833 1834 mInLayout = false; 1835 leaveContext(); 1836 if (DEBUG) Log.v(getTag(), "layoutChildren end"); 1837 } 1838 1839 private void offsetChildrenSecondary(int increment) { 1840 final int childCount = getChildCount(); 1841 if (mOrientation == HORIZONTAL) { 1842 for (int i = 0; i < childCount; i++) { 1843 getChildAt(i).offsetTopAndBottom(increment); 1844 } 1845 } else { 1846 for (int i = 0; i < childCount; i++) { 1847 getChildAt(i).offsetLeftAndRight(increment); 1848 } 1849 } 1850 } 1851 1852 private void offsetChildrenPrimary(int increment) { 1853 final int childCount = getChildCount(); 1854 if (mOrientation == VERTICAL) { 1855 for (int i = 0; i < childCount; i++) { 1856 getChildAt(i).offsetTopAndBottom(increment); 1857 } 1858 } else { 1859 for (int i = 0; i < childCount; i++) { 1860 getChildAt(i).offsetLeftAndRight(increment); 1861 } 1862 } 1863 } 1864 1865 @Override 1866 public int scrollHorizontallyBy(int dx, Recycler recycler, RecyclerView.State state) { 1867 if (DEBUG) Log.v(getTag(), "scrollHorizontallyBy " + dx); 1868 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1869 return 0; 1870 } 1871 saveContext(recycler, state); 1872 mInScroll = true; 1873 int result; 1874 if (mOrientation == HORIZONTAL) { 1875 result = scrollDirectionPrimary(dx); 1876 } else { 1877 result = scrollDirectionSecondary(dx); 1878 } 1879 leaveContext(); 1880 mInScroll = false; 1881 return result; 1882 } 1883 1884 @Override 1885 public int scrollVerticallyBy(int dy, Recycler recycler, RecyclerView.State state) { 1886 if (DEBUG) Log.v(getTag(), "scrollVerticallyBy " + dy); 1887 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1888 return 0; 1889 } 1890 mInScroll = true; 1891 saveContext(recycler, state); 1892 int result; 1893 if (mOrientation == VERTICAL) { 1894 result = scrollDirectionPrimary(dy); 1895 } else { 1896 result = scrollDirectionSecondary(dy); 1897 } 1898 leaveContext(); 1899 mInScroll = false; 1900 return result; 1901 } 1902 1903 // scroll in main direction may add/prune views 1904 private int scrollDirectionPrimary(int da) { 1905 if (TRACE) TraceHelper.beginSection("scrollPrimary"); 1906 boolean isMaxUnknown = false, isMinUnknown = false; 1907 int minScroll = 0, maxScroll = 0; 1908 if (da > 0) { 1909 isMaxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 1910 if (!isMaxUnknown) { 1911 maxScroll = mWindowAlignment.mainAxis().getMaxScroll(); 1912 if (mScrollOffsetPrimary + da > maxScroll) { 1913 da = maxScroll - mScrollOffsetPrimary; 1914 } 1915 } 1916 } else if (da < 0) { 1917 isMinUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 1918 if (!isMinUnknown) { 1919 minScroll = mWindowAlignment.mainAxis().getMinScroll(); 1920 if (mScrollOffsetPrimary + da < minScroll) { 1921 da = minScroll - mScrollOffsetPrimary; 1922 } 1923 } 1924 } 1925 if (da == 0) { 1926 if (TRACE) TraceHelper.endSection(); 1927 return 0; 1928 } 1929 offsetChildrenPrimary(-da); 1930 mScrollOffsetPrimary += da; 1931 if (mInLayout) { 1932 if (TRACE) TraceHelper.endSection(); 1933 return da; 1934 } 1935 1936 int childCount = getChildCount(); 1937 boolean updated; 1938 1939 if (mReverseFlowPrimary ? da > 0 : da < 0) { 1940 prependVisibleItems(); 1941 } else { 1942 appendVisibleItems(); 1943 } 1944 updated = getChildCount() > childCount; 1945 childCount = getChildCount(); 1946 1947 if (TRACE) TraceHelper.beginSection("remove"); 1948 if (mReverseFlowPrimary ? da > 0 : da < 0) { 1949 removeInvisibleViewsAtEnd(); 1950 } else { 1951 removeInvisibleViewsAtFront(); 1952 } 1953 if (TRACE) TraceHelper.endSection(); 1954 updated |= getChildCount() < childCount; 1955 if (updated) { 1956 updateRowSecondarySizeRefresh(); 1957 } 1958 1959 mBaseGridView.invalidate(); 1960 if (TRACE) TraceHelper.endSection(); 1961 return da; 1962 } 1963 1964 // scroll in second direction will not add/prune views 1965 private int scrollDirectionSecondary(int dy) { 1966 if (dy == 0) { 1967 return 0; 1968 } 1969 offsetChildrenSecondary(-dy); 1970 mScrollOffsetSecondary += dy; 1971 mBaseGridView.invalidate(); 1972 return dy; 1973 } 1974 1975 private void updateScrollMax() { 1976 int highVisiblePos = (!mReverseFlowPrimary) ? mGrid.getLastVisibleIndex() 1977 : mGrid.getFirstVisibleIndex(); 1978 int highMaxPos = (!mReverseFlowPrimary) ? mState.getItemCount() - 1 : 0; 1979 if (highVisiblePos < 0) { 1980 return; 1981 } 1982 final boolean highAvailable = highVisiblePos == highMaxPos; 1983 final boolean maxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 1984 if (!highAvailable && maxUnknown) { 1985 return; 1986 } 1987 int maxEdge = mGrid.findRowMax(true, sTwoInts) + mScrollOffsetPrimary; 1988 int rowIndex = sTwoInts[0]; 1989 int pos = sTwoInts[1]; 1990 int savedMaxEdge = mWindowAlignment.mainAxis().getMaxEdge(); 1991 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 1992 int maxScroll = getPrimarySystemScrollPosition(findViewByPosition(pos)); 1993 mWindowAlignment.mainAxis().setMaxEdge(savedMaxEdge); 1994 1995 if (highAvailable) { 1996 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 1997 mWindowAlignment.mainAxis().setMaxScroll(maxScroll); 1998 if (DEBUG) Log.v(getTag(), "updating scroll maxEdge to " + maxEdge + 1999 " scrollMax to " + maxScroll); 2000 } else { 2001 mWindowAlignment.mainAxis().invalidateScrollMax(); 2002 if (DEBUG) Log.v(getTag(), "Invalidate scrollMax since it should be " 2003 + "greater than " + maxScroll); 2004 } 2005 } 2006 2007 private void updateScrollMin() { 2008 int lowVisiblePos = (!mReverseFlowPrimary) ? mGrid.getFirstVisibleIndex() 2009 : mGrid.getLastVisibleIndex(); 2010 int lowMinPos = (!mReverseFlowPrimary) ? 0 : mState.getItemCount() - 1; 2011 if (lowVisiblePos < 0) { 2012 return; 2013 } 2014 final boolean lowAvailable = lowVisiblePos == lowMinPos; 2015 final boolean minUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 2016 if (!lowAvailable && minUnknown) { 2017 return; 2018 } 2019 int minEdge = mGrid.findRowMin(false, sTwoInts) + mScrollOffsetPrimary; 2020 int rowIndex = sTwoInts[0]; 2021 int pos = sTwoInts[1]; 2022 int savedMinEdge = mWindowAlignment.mainAxis().getMinEdge(); 2023 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2024 int minScroll = getPrimarySystemScrollPosition(findViewByPosition(pos)); 2025 mWindowAlignment.mainAxis().setMinEdge(savedMinEdge); 2026 2027 if (lowAvailable) { 2028 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2029 mWindowAlignment.mainAxis().setMinScroll(minScroll); 2030 if (DEBUG) Log.v(getTag(), "updating scroll minEdge to " + minEdge + 2031 " scrollMin to " + minScroll); 2032 } else { 2033 mWindowAlignment.mainAxis().invalidateScrollMin(); 2034 if (DEBUG) Log.v(getTag(), "Invalidate scrollMin, since it should be " 2035 + "less than " + minScroll); 2036 } 2037 } 2038 2039 private void updateScrollSecondAxis() { 2040 mWindowAlignment.secondAxis().setMinEdge(0); 2041 mWindowAlignment.secondAxis().setMaxEdge(getSizeSecondary()); 2042 } 2043 2044 private void initScrollController() { 2045 mWindowAlignment.reset(); 2046 mWindowAlignment.horizontal.setSize(getWidth()); 2047 mWindowAlignment.vertical.setSize(getHeight()); 2048 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2049 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2050 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2051 mScrollOffsetPrimary = -mWindowAlignment.mainAxis().getPaddingLow(); 2052 mScrollOffsetSecondary = -mWindowAlignment.secondAxis().getPaddingLow(); 2053 2054 if (DEBUG) { 2055 Log.v(getTag(), "initScrollController mSizePrimary " + mSizePrimary 2056 + " mWindowAlignment " + mWindowAlignment 2057 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2058 } 2059 } 2060 2061 private void updateScrollController() { 2062 // mScrollOffsetPrimary and mScrollOffsetSecondary includes the padding. 2063 // e.g. when topPadding is 16 for horizontal grid view, the initial 2064 // mScrollOffsetSecondary is -16. fastRelayout() put views based on offsets(not padding), 2065 // when padding changes to 20, we also need update mScrollOffsetSecondary to -20 before 2066 // fastRelayout() is performed 2067 int paddingPrimaryDiff, paddingSecondaryDiff; 2068 if (mOrientation == HORIZONTAL) { 2069 paddingPrimaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2070 paddingSecondaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2071 } else { 2072 paddingPrimaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2073 paddingSecondaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2074 } 2075 mScrollOffsetPrimary -= paddingPrimaryDiff; 2076 mScrollOffsetSecondary -= paddingSecondaryDiff; 2077 2078 mWindowAlignment.horizontal.setSize(getWidth()); 2079 mWindowAlignment.vertical.setSize(getHeight()); 2080 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2081 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2082 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2083 2084 if (DEBUG) { 2085 Log.v(getTag(), "updateScrollController mSizePrimary " + mSizePrimary 2086 + " mWindowAlignment " + mWindowAlignment 2087 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2088 } 2089 } 2090 2091 public void setSelection(RecyclerView parent, int position, 2092 int primaryScrollExtra) { 2093 setSelection(parent, position, 0, false, primaryScrollExtra); 2094 } 2095 2096 public void setSelectionSmooth(RecyclerView parent, int position) { 2097 setSelection(parent, position, 0, true, 0); 2098 } 2099 2100 public void setSelectionWithSub(RecyclerView parent, int position, int subposition, 2101 int primaryScrollExtra) { 2102 setSelection(parent, position, subposition, false, primaryScrollExtra); 2103 } 2104 2105 public void setSelectionSmoothWithSub(RecyclerView parent, int position, int subposition) { 2106 setSelection(parent, position, subposition, true, 0); 2107 } 2108 2109 public int getSelection() { 2110 return mFocusPosition; 2111 } 2112 2113 public int getSubSelection() { 2114 return mSubFocusPosition; 2115 } 2116 2117 public void setSelection(RecyclerView parent, int position, int subposition, boolean smooth, 2118 int primaryScrollExtra) { 2119 if (mFocusPosition != position && position != NO_POSITION 2120 || subposition != mSubFocusPosition || primaryScrollExtra != mPrimaryScrollExtra) { 2121 scrollToSelection(parent, position, subposition, smooth, primaryScrollExtra); 2122 } 2123 } 2124 2125 private void scrollToSelection(RecyclerView parent, int position, int subposition, 2126 boolean smooth, int primaryScrollExtra) { 2127 if (TRACE) TraceHelper.beginSection("scrollToSelection"); 2128 mPrimaryScrollExtra = primaryScrollExtra; 2129 View view = findViewByPosition(position); 2130 if (view != null) { 2131 mInSelection = true; 2132 scrollToView(view, smooth); 2133 mInSelection = false; 2134 } else { 2135 mFocusPosition = position; 2136 mSubFocusPosition = subposition; 2137 mFocusPositionOffset = Integer.MIN_VALUE; 2138 if (!mLayoutEnabled) { 2139 return; 2140 } 2141 if (smooth) { 2142 if (!hasDoneFirstLayout()) { 2143 Log.w(getTag(), "setSelectionSmooth should " + 2144 "not be called before first layout pass"); 2145 return; 2146 } 2147 startPositionSmoothScroller(position); 2148 } else { 2149 mForceFullLayout = true; 2150 parent.requestLayout(); 2151 } 2152 } 2153 if (TRACE) TraceHelper.endSection(); 2154 } 2155 2156 void startPositionSmoothScroller(int position) { 2157 LinearSmoothScroller linearSmoothScroller = new GridLinearSmoothScroller() { 2158 @Override 2159 public PointF computeScrollVectorForPosition(int targetPosition) { 2160 if (getChildCount() == 0) { 2161 return null; 2162 } 2163 final int firstChildPos = getPosition(getChildAt(0)); 2164 // TODO We should be able to deduce direction from bounds of current and target 2165 // focus, rather than making assumptions about positions and directionality 2166 final boolean isStart = mReverseFlowPrimary ? targetPosition > firstChildPos 2167 : targetPosition < firstChildPos; 2168 final int direction = isStart ? -1 : 1; 2169 if (mOrientation == HORIZONTAL) { 2170 return new PointF(direction, 0); 2171 } else { 2172 return new PointF(0, direction); 2173 } 2174 } 2175 2176 }; 2177 linearSmoothScroller.setTargetPosition(position); 2178 startSmoothScroll(linearSmoothScroller); 2179 } 2180 2181 private void processPendingMovement(boolean forward) { 2182 if (forward ? hasCreatedLastItem() : hasCreatedFirstItem()) { 2183 return; 2184 } 2185 if (mPendingMoveSmoothScroller == null) { 2186 // Stop existing scroller and create a new PendingMoveSmoothScroller. 2187 mBaseGridView.stopScroll(); 2188 PendingMoveSmoothScroller linearSmoothScroller = new PendingMoveSmoothScroller( 2189 forward ? 1 : -1, mNumRows > 1); 2190 mFocusPositionOffset = 0; 2191 startSmoothScroll(linearSmoothScroller); 2192 if (linearSmoothScroller.isRunning()) { 2193 mPendingMoveSmoothScroller = linearSmoothScroller; 2194 } 2195 } else { 2196 if (forward) { 2197 mPendingMoveSmoothScroller.increasePendingMoves(); 2198 } else { 2199 mPendingMoveSmoothScroller.decreasePendingMoves(); 2200 } 2201 } 2202 } 2203 2204 @Override 2205 public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) { 2206 if (DEBUG) Log.v(getTag(), "onItemsAdded positionStart " 2207 + positionStart + " itemCount " + itemCount); 2208 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2209 int pos = mFocusPosition + mFocusPositionOffset; 2210 if (positionStart <= pos) { 2211 mFocusPositionOffset += itemCount; 2212 } 2213 } 2214 mChildrenStates.clear(); 2215 } 2216 2217 @Override 2218 public void onItemsChanged(RecyclerView recyclerView) { 2219 if (DEBUG) Log.v(getTag(), "onItemsChanged"); 2220 mFocusPositionOffset = 0; 2221 mChildrenStates.clear(); 2222 } 2223 2224 @Override 2225 public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) { 2226 if (DEBUG) Log.v(getTag(), "onItemsRemoved positionStart " 2227 + positionStart + " itemCount " + itemCount); 2228 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2229 int pos = mFocusPosition + mFocusPositionOffset; 2230 if (positionStart <= pos) { 2231 if (positionStart + itemCount > pos) { 2232 // stop updating offset after the focus item was removed 2233 mFocusPositionOffset = Integer.MIN_VALUE; 2234 } else { 2235 mFocusPositionOffset -= itemCount; 2236 } 2237 } 2238 } 2239 mChildrenStates.clear(); 2240 } 2241 2242 @Override 2243 public void onItemsMoved(RecyclerView recyclerView, int fromPosition, int toPosition, 2244 int itemCount) { 2245 if (DEBUG) Log.v(getTag(), "onItemsMoved fromPosition " 2246 + fromPosition + " toPosition " + toPosition); 2247 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2248 int pos = mFocusPosition + mFocusPositionOffset; 2249 if (fromPosition <= pos && pos < fromPosition + itemCount) { 2250 // moved items include focused position 2251 mFocusPositionOffset += toPosition - fromPosition; 2252 } else if (fromPosition < pos && toPosition > pos - itemCount) { 2253 // move items before focus position to after focused position 2254 mFocusPositionOffset -= itemCount; 2255 } else if (fromPosition > pos && toPosition < pos) { 2256 // move items after focus position to before focused position 2257 mFocusPositionOffset += itemCount; 2258 } 2259 } 2260 mChildrenStates.clear(); 2261 } 2262 2263 @Override 2264 public void onItemsUpdated(RecyclerView recyclerView, int positionStart, int itemCount) { 2265 if (DEBUG) Log.v(getTag(), "onItemsUpdated positionStart " 2266 + positionStart + " itemCount " + itemCount); 2267 for (int i = positionStart, end = positionStart + itemCount; i < end; i++) { 2268 mChildrenStates.remove(i); 2269 } 2270 } 2271 2272 @Override 2273 public boolean onRequestChildFocus(RecyclerView parent, View child, View focused) { 2274 if (mFocusSearchDisabled) { 2275 return true; 2276 } 2277 if (getPositionByView(child) == NO_POSITION) { 2278 // This shouldn't happen, but in case it does be sure not to attempt a 2279 // scroll to a view whose item has been removed. 2280 return true; 2281 } 2282 if (!mInLayout && !mInSelection && !mInScroll) { 2283 scrollToView(child, focused, true); 2284 } 2285 return true; 2286 } 2287 2288 @Override 2289 public boolean requestChildRectangleOnScreen(RecyclerView parent, View view, Rect rect, 2290 boolean immediate) { 2291 if (DEBUG) Log.v(getTag(), "requestChildRectangleOnScreen " + view + " " + rect); 2292 return false; 2293 } 2294 2295 int getScrollOffsetX() { 2296 return mOrientation == HORIZONTAL ? mScrollOffsetPrimary : mScrollOffsetSecondary; 2297 } 2298 2299 int getScrollOffsetY() { 2300 return mOrientation == HORIZONTAL ? mScrollOffsetSecondary : mScrollOffsetPrimary; 2301 } 2302 2303 public void getViewSelectedOffsets(View view, int[] offsets) { 2304 if (mOrientation == HORIZONTAL) { 2305 offsets[0] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2306 offsets[1] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2307 } else { 2308 offsets[1] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2309 offsets[0] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2310 } 2311 } 2312 2313 private int getPrimarySystemScrollPosition(View view) { 2314 final int viewCenterPrimary = mScrollOffsetPrimary + getViewCenter(view); 2315 final int viewMin = getViewMin(view); 2316 final int viewMax = getViewMax(view); 2317 // TODO: change to use State object in onRequestChildFocus() 2318 boolean isMin, isMax; 2319 if (!mReverseFlowPrimary) { 2320 isMin = mGrid.getFirstVisibleIndex() == 0; 2321 isMax = mGrid.getLastVisibleIndex() == (mState == null ? 2322 getItemCount() : mState.getItemCount()) - 1; 2323 } else { 2324 isMax = mGrid.getFirstVisibleIndex() == 0; 2325 isMin = mGrid.getLastVisibleIndex() == (mState == null ? 2326 getItemCount() : mState.getItemCount()) - 1; 2327 } 2328 for (int i = getChildCount() - 1; (isMin || isMax) && i >= 0; i--) { 2329 View v = getChildAt(i); 2330 if (v == view || v == null) { 2331 continue; 2332 } 2333 if (isMin && getViewMin(v) < viewMin) { 2334 isMin = false; 2335 } 2336 if (isMax && getViewMax(v) > viewMax) { 2337 isMax = false; 2338 } 2339 } 2340 return mWindowAlignment.mainAxis().getSystemScrollPos(viewCenterPrimary, isMin, isMax); 2341 } 2342 2343 /** 2344 * Get adjusted primary position for a given childView (if there is multiple ItemAlignment defined 2345 * on the view). 2346 */ 2347 private int getAdjustedPrimaryScrollPosition(int scrollPrimary, View view, View childView) { 2348 int subindex = getSubPositionByView(view, childView); 2349 if (subindex != 0) { 2350 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 2351 scrollPrimary += lp.getAlignMultiple()[subindex] - lp.getAlignMultiple()[0]; 2352 } 2353 return scrollPrimary; 2354 } 2355 2356 private int getSecondarySystemScrollPosition(View view) { 2357 int viewCenterSecondary = mScrollOffsetSecondary + getViewCenterSecondary(view); 2358 int pos = getPositionByView(view); 2359 Grid.Location location = mGrid.getLocation(pos); 2360 final int row = location.row; 2361 final boolean isMin, isMax; 2362 if (!mReverseFlowSecondary) { 2363 isMin = row == 0; 2364 isMax = row == mGrid.getNumRows() - 1; 2365 } else { 2366 isMax = row == 0; 2367 isMin = row == mGrid.getNumRows() - 1; 2368 } 2369 return mWindowAlignment.secondAxis().getSystemScrollPos(viewCenterSecondary, isMin, isMax); 2370 } 2371 2372 /** 2373 * Scroll to a given child view and change mFocusPosition. 2374 */ 2375 private void scrollToView(View view, boolean smooth) { 2376 scrollToView(view, view == null ? null : view.findFocus(), smooth); 2377 } 2378 2379 /** 2380 * Scroll to a given child view and change mFocusPosition. 2381 */ 2382 private void scrollToView(View view, View childView, boolean smooth) { 2383 int newFocusPosition = getPositionByView(view); 2384 int newSubFocusPosition = getSubPositionByView(view, childView); 2385 if (newFocusPosition != mFocusPosition || newSubFocusPosition != mSubFocusPosition) { 2386 mFocusPosition = newFocusPosition; 2387 mSubFocusPosition = newSubFocusPosition; 2388 mFocusPositionOffset = 0; 2389 if (!mInLayout) { 2390 dispatchChildSelected(); 2391 } 2392 if (mBaseGridView.isChildrenDrawingOrderEnabledInternal()) { 2393 mBaseGridView.invalidate(); 2394 } 2395 } 2396 if (view == null) { 2397 return; 2398 } 2399 if (!view.hasFocus() && mBaseGridView.hasFocus()) { 2400 // transfer focus to the child if it does not have focus yet (e.g. triggered 2401 // by setSelection()) 2402 view.requestFocus(); 2403 } 2404 if (!mScrollEnabled && smooth) { 2405 return; 2406 } 2407 if (getScrollPosition(view, childView, sTwoInts)) { 2408 scrollGrid(sTwoInts[0], sTwoInts[1], smooth); 2409 } 2410 } 2411 2412 private boolean getScrollPosition(View view, View childView, int[] deltas) { 2413 switch (mFocusScrollStrategy) { 2414 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2415 default: 2416 return getAlignedPosition(view, childView, deltas); 2417 case BaseGridView.FOCUS_SCROLL_ITEM: 2418 case BaseGridView.FOCUS_SCROLL_PAGE: 2419 return getNoneAlignedPosition(view, deltas); 2420 } 2421 } 2422 2423 private boolean getNoneAlignedPosition(View view, int[] deltas) { 2424 int pos = getPositionByView(view); 2425 int viewMin = getViewMin(view); 2426 int viewMax = getViewMax(view); 2427 // we either align "firstView" to left/top padding edge 2428 // or align "lastView" to right/bottom padding edge 2429 View firstView = null; 2430 View lastView = null; 2431 int paddingLow = mWindowAlignment.mainAxis().getPaddingLow(); 2432 int clientSize = mWindowAlignment.mainAxis().getClientSize(); 2433 final int row = mGrid.getRowIndex(pos); 2434 if (viewMin < paddingLow) { 2435 // view enters low padding area: 2436 firstView = view; 2437 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2438 // scroll one "page" left/top, 2439 // align first visible item of the "page" at the low padding edge. 2440 while (prependOneColumnVisibleItems()) { 2441 CircularIntArray positions = 2442 mGrid.getItemPositionsInRows(mGrid.getFirstVisibleIndex(), pos)[row]; 2443 firstView = findViewByPosition(positions.get(0)); 2444 if (viewMax - getViewMin(firstView) > clientSize) { 2445 if (positions.size() > 2) { 2446 firstView = findViewByPosition(positions.get(2)); 2447 } 2448 break; 2449 } 2450 } 2451 } 2452 } else if (viewMax > clientSize + paddingLow) { 2453 // view enters high padding area: 2454 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2455 // scroll whole one page right/bottom, align view at the low padding edge. 2456 firstView = view; 2457 do { 2458 CircularIntArray positions = 2459 mGrid.getItemPositionsInRows(pos, mGrid.getLastVisibleIndex())[row]; 2460 lastView = findViewByPosition(positions.get(positions.size() - 1)); 2461 if (getViewMax(lastView) - viewMin > clientSize) { 2462 lastView = null; 2463 break; 2464 } 2465 } while (appendOneColumnVisibleItems()); 2466 if (lastView != null) { 2467 // however if we reached end, we should align last view. 2468 firstView = null; 2469 } 2470 } else { 2471 lastView = view; 2472 } 2473 } 2474 int scrollPrimary = 0; 2475 int scrollSecondary = 0; 2476 if (firstView != null) { 2477 scrollPrimary = getViewMin(firstView) - paddingLow; 2478 } else if (lastView != null) { 2479 scrollPrimary = getViewMax(lastView) - (paddingLow + clientSize); 2480 } 2481 View secondaryAlignedView; 2482 if (firstView != null) { 2483 secondaryAlignedView = firstView; 2484 } else if (lastView != null) { 2485 secondaryAlignedView = lastView; 2486 } else { 2487 secondaryAlignedView = view; 2488 } 2489 scrollSecondary = getSecondarySystemScrollPosition(secondaryAlignedView); 2490 scrollSecondary -= mScrollOffsetSecondary; 2491 if (scrollPrimary != 0 || scrollSecondary != 0) { 2492 deltas[0] = scrollPrimary; 2493 deltas[1] = scrollSecondary; 2494 return true; 2495 } 2496 return false; 2497 } 2498 2499 private boolean getAlignedPosition(View view, View childView, int[] deltas) { 2500 int scrollPrimary = getPrimarySystemScrollPosition(view); 2501 if (childView != null) { 2502 scrollPrimary = getAdjustedPrimaryScrollPosition(scrollPrimary, view, childView); 2503 } 2504 int scrollSecondary = getSecondarySystemScrollPosition(view); 2505 if (DEBUG) { 2506 Log.v(getTag(), "getAlignedPosition " + scrollPrimary + " " + scrollSecondary 2507 + " " + mPrimaryScrollExtra + " " + mWindowAlignment); 2508 Log.v(getTag(), "getAlignedPosition " + mScrollOffsetPrimary + " " + mScrollOffsetSecondary); 2509 } 2510 scrollPrimary -= mScrollOffsetPrimary; 2511 scrollSecondary -= mScrollOffsetSecondary; 2512 scrollPrimary += mPrimaryScrollExtra; 2513 if (scrollPrimary != 0 || scrollSecondary != 0) { 2514 deltas[0] = scrollPrimary; 2515 deltas[1] = scrollSecondary; 2516 return true; 2517 } 2518 return false; 2519 } 2520 2521 private void scrollGrid(int scrollPrimary, int scrollSecondary, boolean smooth) { 2522 if (mInLayout) { 2523 scrollDirectionPrimary(scrollPrimary); 2524 scrollDirectionSecondary(scrollSecondary); 2525 } else { 2526 int scrollX; 2527 int scrollY; 2528 if (mOrientation == HORIZONTAL) { 2529 scrollX = scrollPrimary; 2530 scrollY = scrollSecondary; 2531 } else { 2532 scrollX = scrollSecondary; 2533 scrollY = scrollPrimary; 2534 } 2535 if (smooth) { 2536 mBaseGridView.smoothScrollBy(scrollX, scrollY); 2537 } else { 2538 mBaseGridView.scrollBy(scrollX, scrollY); 2539 } 2540 } 2541 } 2542 2543 public void setPruneChild(boolean pruneChild) { 2544 if (mPruneChild != pruneChild) { 2545 mPruneChild = pruneChild; 2546 if (mPruneChild) { 2547 requestLayout(); 2548 } 2549 } 2550 } 2551 2552 public boolean getPruneChild() { 2553 return mPruneChild; 2554 } 2555 2556 public void setScrollEnabled(boolean scrollEnabled) { 2557 if (mScrollEnabled != scrollEnabled) { 2558 mScrollEnabled = scrollEnabled; 2559 if (mScrollEnabled && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED 2560 && mFocusPosition != NO_POSITION) { 2561 scrollToSelection(mBaseGridView, mFocusPosition, mSubFocusPosition, 2562 true, mPrimaryScrollExtra); 2563 } 2564 } 2565 } 2566 2567 public boolean isScrollEnabled() { 2568 return mScrollEnabled; 2569 } 2570 2571 private int findImmediateChildIndex(View view) { 2572 while (view != null && view != mBaseGridView) { 2573 int index = mBaseGridView.indexOfChild(view); 2574 if (index >= 0) { 2575 return index; 2576 } 2577 view = (View) view.getParent(); 2578 } 2579 return NO_POSITION; 2580 } 2581 2582 void setFocusSearchDisabled(boolean disabled) { 2583 mFocusSearchDisabled = disabled; 2584 } 2585 2586 boolean isFocusSearchDisabled() { 2587 return mFocusSearchDisabled; 2588 } 2589 2590 @Override 2591 public View onInterceptFocusSearch(View focused, int direction) { 2592 if (mFocusSearchDisabled) { 2593 return focused; 2594 } 2595 return null; 2596 } 2597 2598 boolean hasPreviousViewInSameRow(int pos) { 2599 if (mGrid == null || pos == NO_POSITION || mGrid.getFirstVisibleIndex() < 0) { 2600 return false; 2601 } 2602 if (mGrid.getFirstVisibleIndex() > 0) { 2603 return true; 2604 } 2605 final int focusedRow = mGrid.getLocation(pos).row; 2606 for (int i = getChildCount() - 1; i >= 0; i--) { 2607 int position = getPositionByIndex(i); 2608 Grid.Location loc = mGrid.getLocation(position); 2609 if (loc != null && loc.row == focusedRow) { 2610 if (position < pos) { 2611 return true; 2612 } 2613 } 2614 } 2615 return false; 2616 } 2617 2618 @Override 2619 public boolean onAddFocusables(RecyclerView recyclerView, 2620 ArrayList<View> views, int direction, int focusableMode) { 2621 if (mFocusSearchDisabled) { 2622 return true; 2623 } 2624 // If this viewgroup or one of its children currently has focus then we 2625 // consider our children for focus searching in main direction on the same row. 2626 // If this viewgroup has no focus and using focus align, we want the system 2627 // to ignore our children and pass focus to the viewgroup, which will pass 2628 // focus on to its children appropriately. 2629 // If this viewgroup has no focus and not using focus align, we want to 2630 // consider the child that does not overlap with padding area. 2631 if (recyclerView.hasFocus()) { 2632 final int movement = getMovement(direction); 2633 if (movement != PREV_ITEM && movement != NEXT_ITEM) { 2634 // Move on secondary direction uses default addFocusables(). 2635 return false; 2636 } 2637 if (mPendingMoveSmoothScroller != null) { 2638 // don't find next focusable if has pending movement. 2639 return true; 2640 } 2641 final View focused = recyclerView.findFocus(); 2642 final int focusedPos = getPositionByIndex(findImmediateChildIndex(focused)); 2643 // Add focusables of focused item. 2644 if (focusedPos != NO_POSITION) { 2645 findViewByPosition(focusedPos).addFocusables(views, direction, focusableMode); 2646 } 2647 final int focusedRow = mGrid != null && focusedPos != NO_POSITION ? 2648 mGrid.getLocation(focusedPos).row : NO_POSITION; 2649 // Add focusables of next neighbor of same row on the focus search direction. 2650 if (mGrid != null) { 2651 final int focusableCount = views.size(); 2652 for (int i = 0, count = getChildCount(); i < count; i++) { 2653 int index = movement == NEXT_ITEM ? i : count - 1 - i; 2654 final View child = getChildAt(index); 2655 if (child.getVisibility() != View.VISIBLE || !child.hasFocusable()) { 2656 continue; 2657 } 2658 int position = getPositionByIndex(index); 2659 Grid.Location loc = mGrid.getLocation(position); 2660 if (focusedRow == NO_POSITION || (loc != null && loc.row == focusedRow)) { 2661 if (focusedPos == NO_POSITION || 2662 (movement == NEXT_ITEM && position > focusedPos) 2663 || (movement == PREV_ITEM && position < focusedPos)) { 2664 child.addFocusables(views, direction, focusableMode); 2665 if (views.size() > focusableCount) { 2666 break; 2667 } 2668 } 2669 } 2670 } 2671 } 2672 } else { 2673 if (mFocusScrollStrategy != BaseGridView.FOCUS_SCROLL_ALIGNED) { 2674 // adding views not overlapping padding area to avoid scrolling in gaining focus 2675 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2676 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2677 int focusableCount = views.size(); 2678 for (int i = 0, count = getChildCount(); i < count; i++) { 2679 View child = getChildAt(i); 2680 if (child.getVisibility() == View.VISIBLE) { 2681 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2682 child.addFocusables(views, direction, focusableMode); 2683 } 2684 } 2685 } 2686 // if we cannot find any, then just add all children. 2687 if (views.size() == focusableCount) { 2688 for (int i = 0, count = getChildCount(); i < count; i++) { 2689 View child = getChildAt(i); 2690 if (child.getVisibility() == View.VISIBLE) { 2691 child.addFocusables(views, direction, focusableMode); 2692 } 2693 } 2694 if (views.size() != focusableCount) { 2695 return true; 2696 } 2697 } else { 2698 return true; 2699 } 2700 // if still cannot find any, fall through and add itself 2701 } 2702 if (recyclerView.isFocusable()) { 2703 views.add(recyclerView); 2704 } 2705 } 2706 return true; 2707 } 2708 2709 private boolean hasCreatedLastItem() { 2710 int count = mState.getItemCount(); 2711 return count == 0 || findViewByPosition(count - 1) != null; 2712 } 2713 2714 private boolean hasCreatedFirstItem() { 2715 int count = mState.getItemCount(); 2716 return count == 0 || findViewByPosition(0) != null; 2717 } 2718 2719 boolean canScrollTo(View view) { 2720 return view.getVisibility() == View.VISIBLE && (!hasFocus() || view.hasFocusable()); 2721 } 2722 2723 @Override 2724 public View onFocusSearchFailed(View focused, int direction, Recycler recycler, 2725 RecyclerView.State state) { 2726 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed direction " + direction); 2727 2728 View view = null; 2729 int movement = getMovement(direction); 2730 final boolean isScroll = mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE; 2731 saveContext(recycler, state); 2732 if (movement == NEXT_ITEM) { 2733 if (isScroll || !mFocusOutEnd) { 2734 view = focused; 2735 } 2736 if (mScrollEnabled && !hasCreatedLastItem()) { 2737 processPendingMovement(true); 2738 view = focused; 2739 } 2740 } else if (movement == PREV_ITEM) { 2741 if (isScroll || !mFocusOutFront) { 2742 view = focused; 2743 } 2744 if (mScrollEnabled && !hasCreatedFirstItem()) { 2745 processPendingMovement(false); 2746 view = focused; 2747 } 2748 } 2749 leaveContext(); 2750 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed returning view " + view); 2751 return view; 2752 } 2753 2754 boolean gridOnRequestFocusInDescendants(RecyclerView recyclerView, int direction, 2755 Rect previouslyFocusedRect) { 2756 switch (mFocusScrollStrategy) { 2757 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2758 default: 2759 return gridOnRequestFocusInDescendantsAligned(recyclerView, 2760 direction, previouslyFocusedRect); 2761 case BaseGridView.FOCUS_SCROLL_PAGE: 2762 case BaseGridView.FOCUS_SCROLL_ITEM: 2763 return gridOnRequestFocusInDescendantsUnaligned(recyclerView, 2764 direction, previouslyFocusedRect); 2765 } 2766 } 2767 2768 private boolean gridOnRequestFocusInDescendantsAligned(RecyclerView recyclerView, 2769 int direction, Rect previouslyFocusedRect) { 2770 View view = findViewByPosition(mFocusPosition); 2771 if (view != null) { 2772 boolean result = view.requestFocus(direction, previouslyFocusedRect); 2773 if (!result && DEBUG) { 2774 Log.w(getTag(), "failed to request focus on " + view); 2775 } 2776 return result; 2777 } 2778 return false; 2779 } 2780 2781 private boolean gridOnRequestFocusInDescendantsUnaligned(RecyclerView recyclerView, 2782 int direction, Rect previouslyFocusedRect) { 2783 // focus to view not overlapping padding area to avoid scrolling in gaining focus 2784 int index; 2785 int increment; 2786 int end; 2787 int count = getChildCount(); 2788 if ((direction & View.FOCUS_FORWARD) != 0) { 2789 index = 0; 2790 increment = 1; 2791 end = count; 2792 } else { 2793 index = count - 1; 2794 increment = -1; 2795 end = -1; 2796 } 2797 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2798 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2799 for (int i = index; i != end; i += increment) { 2800 View child = getChildAt(i); 2801 if (child.getVisibility() == View.VISIBLE) { 2802 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2803 if (child.requestFocus(direction, previouslyFocusedRect)) { 2804 return true; 2805 } 2806 } 2807 } 2808 } 2809 return false; 2810 } 2811 2812 private final static int PREV_ITEM = 0; 2813 private final static int NEXT_ITEM = 1; 2814 private final static int PREV_ROW = 2; 2815 private final static int NEXT_ROW = 3; 2816 2817 private int getMovement(int direction) { 2818 int movement = View.FOCUS_LEFT; 2819 2820 if (mOrientation == HORIZONTAL) { 2821 switch(direction) { 2822 case View.FOCUS_LEFT: 2823 movement = (!mReverseFlowPrimary) ? PREV_ITEM : NEXT_ITEM; 2824 break; 2825 case View.FOCUS_RIGHT: 2826 movement = (!mReverseFlowPrimary) ? NEXT_ITEM : PREV_ITEM; 2827 break; 2828 case View.FOCUS_UP: 2829 movement = PREV_ROW; 2830 break; 2831 case View.FOCUS_DOWN: 2832 movement = NEXT_ROW; 2833 break; 2834 } 2835 } else if (mOrientation == VERTICAL) { 2836 switch(direction) { 2837 case View.FOCUS_LEFT: 2838 movement = (!mReverseFlowPrimary) ? PREV_ROW : NEXT_ROW; 2839 break; 2840 case View.FOCUS_RIGHT: 2841 movement = (!mReverseFlowPrimary) ? NEXT_ROW : PREV_ROW; 2842 break; 2843 case View.FOCUS_UP: 2844 movement = PREV_ITEM; 2845 break; 2846 case View.FOCUS_DOWN: 2847 movement = NEXT_ITEM; 2848 break; 2849 } 2850 } 2851 2852 return movement; 2853 } 2854 2855 int getChildDrawingOrder(RecyclerView recyclerView, int childCount, int i) { 2856 View view = findViewByPosition(mFocusPosition); 2857 if (view == null) { 2858 return i; 2859 } 2860 int focusIndex = recyclerView.indexOfChild(view); 2861 // supposely 0 1 2 3 4 5 6 7 8 9, 4 is the center item 2862 // drawing order is 0 1 2 3 9 8 7 6 5 4 2863 if (i < focusIndex) { 2864 return i; 2865 } else if (i < childCount - 1) { 2866 return focusIndex + childCount - 1 - i; 2867 } else { 2868 return focusIndex; 2869 } 2870 } 2871 2872 @Override 2873 public void onAdapterChanged(RecyclerView.Adapter oldAdapter, 2874 RecyclerView.Adapter newAdapter) { 2875 if (DEBUG) Log.v(getTag(), "onAdapterChanged to " + newAdapter); 2876 if (oldAdapter != null) { 2877 discardLayoutInfo(); 2878 mFocusPosition = NO_POSITION; 2879 mFocusPositionOffset = 0; 2880 mChildrenStates.clear(); 2881 } 2882 if (newAdapter instanceof FacetProviderAdapter) { 2883 mFacetProviderAdapter = (FacetProviderAdapter) newAdapter; 2884 } else { 2885 mFacetProviderAdapter = null; 2886 } 2887 super.onAdapterChanged(oldAdapter, newAdapter); 2888 } 2889 2890 private void discardLayoutInfo() { 2891 mGrid = null; 2892 mRowSizeSecondary = null; 2893 mRowSecondarySizeRefresh = false; 2894 } 2895 2896 public void setLayoutEnabled(boolean layoutEnabled) { 2897 if (mLayoutEnabled != layoutEnabled) { 2898 mLayoutEnabled = layoutEnabled; 2899 requestLayout(); 2900 } 2901 } 2902 2903 void setChildrenVisibility(int visiblity) { 2904 mChildVisibility = visiblity; 2905 if (mChildVisibility != -1) { 2906 int count = getChildCount(); 2907 for (int i= 0; i < count; i++) { 2908 getChildAt(i).setVisibility(mChildVisibility); 2909 } 2910 } 2911 } 2912 2913 final static class SavedState implements Parcelable { 2914 2915 int index; // index inside adapter of the current view 2916 Bundle childStates = Bundle.EMPTY; 2917 2918 @Override 2919 public void writeToParcel(Parcel out, int flags) { 2920 out.writeInt(index); 2921 out.writeBundle(childStates); 2922 } 2923 2924 @SuppressWarnings("hiding") 2925 public static final Parcelable.Creator<SavedState> CREATOR = 2926 new Parcelable.Creator<SavedState>() { 2927 @Override 2928 public SavedState createFromParcel(Parcel in) { 2929 return new SavedState(in); 2930 } 2931 2932 @Override 2933 public SavedState[] newArray(int size) { 2934 return new SavedState[size]; 2935 } 2936 }; 2937 2938 @Override 2939 public int describeContents() { 2940 return 0; 2941 } 2942 2943 SavedState(Parcel in) { 2944 index = in.readInt(); 2945 childStates = in.readBundle(GridLayoutManager.class.getClassLoader()); 2946 } 2947 2948 SavedState() { 2949 } 2950 } 2951 2952 @Override 2953 public Parcelable onSaveInstanceState() { 2954 if (DEBUG) Log.v(getTag(), "onSaveInstanceState getSelection() " + getSelection()); 2955 SavedState ss = new SavedState(); 2956 // save selected index 2957 ss.index = getSelection(); 2958 // save offscreen child (state when they are recycled) 2959 Bundle bundle = mChildrenStates.saveAsBundle(); 2960 // save views currently is on screen (TODO save cached views) 2961 for (int i = 0, count = getChildCount(); i < count; i++) { 2962 View view = getChildAt(i); 2963 int position = getPositionByView(view); 2964 if (position != NO_POSITION) { 2965 bundle = mChildrenStates.saveOnScreenView(bundle, view, position); 2966 } 2967 } 2968 ss.childStates = bundle; 2969 return ss; 2970 } 2971 2972 void onChildRecycled(RecyclerView.ViewHolder holder) { 2973 final int position = holder.getAdapterPosition(); 2974 if (position != NO_POSITION) { 2975 mChildrenStates.saveOffscreenView(holder.itemView, position); 2976 } 2977 } 2978 2979 @Override 2980 public void onRestoreInstanceState(Parcelable state) { 2981 if (!(state instanceof SavedState)) { 2982 return; 2983 } 2984 SavedState loadingState = (SavedState)state; 2985 mFocusPosition = loadingState.index; 2986 mFocusPositionOffset = 0; 2987 mChildrenStates.loadFromBundle(loadingState.childStates); 2988 mForceFullLayout = true; 2989 requestLayout(); 2990 if (DEBUG) Log.v(getTag(), "onRestoreInstanceState mFocusPosition " + mFocusPosition); 2991 } 2992} 2993