GridLayoutManager.java revision 8c5713428379689839330c344c4a800039db0400
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 * Pixels of extra space for layout item (outside the widget) 597 */ 598 private int mExtraLayoutSpace; 599 600 /** 601 * Allow DPAD key to navigate out at the front of the View (where position = 0), 602 * default is false. 603 */ 604 private boolean mFocusOutFront; 605 606 /** 607 * Allow DPAD key to navigate out at the end of the view, default is false. 608 */ 609 private boolean mFocusOutEnd; 610 611 /** 612 * True if focus search is disabled. 613 */ 614 private boolean mFocusSearchDisabled; 615 616 /** 617 * True if prune child, might be disabled during transition. 618 */ 619 private boolean mPruneChild = true; 620 621 /** 622 * True if scroll content, might be disabled during transition. 623 */ 624 private boolean mScrollEnabled = true; 625 626 /** 627 * Temporary variable: an int array of length=2. 628 */ 629 private static int[] sTwoInts = new int[2]; 630 631 /** 632 * Set to true for RTL layout in horizontal orientation 633 */ 634 private boolean mReverseFlowPrimary = false; 635 636 /** 637 * Set to true for RTL layout in vertical orientation 638 */ 639 private boolean mReverseFlowSecondary = false; 640 641 /** 642 * Temporaries used for measuring. 643 */ 644 private int[] mMeasuredDimension = new int[2]; 645 646 final ViewsStateBundle mChildrenStates = new ViewsStateBundle(); 647 648 /** 649 * Optional interface implemented by Adapter. 650 */ 651 private FacetProviderAdapter mFacetProviderAdapter; 652 653 public GridLayoutManager(BaseGridView baseGridView) { 654 mBaseGridView = baseGridView; 655 } 656 657 public void setOrientation(int orientation) { 658 if (orientation != HORIZONTAL && orientation != VERTICAL) { 659 if (DEBUG) Log.v(getTag(), "invalid orientation: " + orientation); 660 return; 661 } 662 663 mOrientation = orientation; 664 mWindowAlignment.setOrientation(orientation); 665 mItemAlignment.setOrientation(orientation); 666 mForceFullLayout = true; 667 } 668 669 public void onRtlPropertiesChanged(int layoutDirection) { 670 if (mOrientation == HORIZONTAL) { 671 mReverseFlowPrimary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 672 mReverseFlowSecondary = false; 673 } else { 674 mReverseFlowSecondary = layoutDirection == View.LAYOUT_DIRECTION_RTL; 675 mReverseFlowPrimary = false; 676 } 677 mWindowAlignment.horizontal.setReversedFlow(layoutDirection == View.LAYOUT_DIRECTION_RTL); 678 } 679 680 public int getFocusScrollStrategy() { 681 return mFocusScrollStrategy; 682 } 683 684 public void setFocusScrollStrategy(int focusScrollStrategy) { 685 mFocusScrollStrategy = focusScrollStrategy; 686 } 687 688 public void setWindowAlignment(int windowAlignment) { 689 mWindowAlignment.mainAxis().setWindowAlignment(windowAlignment); 690 } 691 692 public int getWindowAlignment() { 693 return mWindowAlignment.mainAxis().getWindowAlignment(); 694 } 695 696 public void setWindowAlignmentOffset(int alignmentOffset) { 697 mWindowAlignment.mainAxis().setWindowAlignmentOffset(alignmentOffset); 698 } 699 700 public int getWindowAlignmentOffset() { 701 return mWindowAlignment.mainAxis().getWindowAlignmentOffset(); 702 } 703 704 public void setWindowAlignmentOffsetPercent(float offsetPercent) { 705 mWindowAlignment.mainAxis().setWindowAlignmentOffsetPercent(offsetPercent); 706 } 707 708 public float getWindowAlignmentOffsetPercent() { 709 return mWindowAlignment.mainAxis().getWindowAlignmentOffsetPercent(); 710 } 711 712 public void setItemAlignmentOffset(int alignmentOffset) { 713 mItemAlignment.mainAxis().setItemAlignmentOffset(alignmentOffset); 714 updateChildAlignments(); 715 } 716 717 public int getItemAlignmentOffset() { 718 return mItemAlignment.mainAxis().getItemAlignmentOffset(); 719 } 720 721 public void setItemAlignmentOffsetWithPadding(boolean withPadding) { 722 mItemAlignment.mainAxis().setItemAlignmentOffsetWithPadding(withPadding); 723 updateChildAlignments(); 724 } 725 726 public boolean isItemAlignmentOffsetWithPadding() { 727 return mItemAlignment.mainAxis().isItemAlignmentOffsetWithPadding(); 728 } 729 730 public void setItemAlignmentOffsetPercent(float offsetPercent) { 731 mItemAlignment.mainAxis().setItemAlignmentOffsetPercent(offsetPercent); 732 updateChildAlignments(); 733 } 734 735 public float getItemAlignmentOffsetPercent() { 736 return mItemAlignment.mainAxis().getItemAlignmentOffsetPercent(); 737 } 738 739 public void setItemAlignmentViewId(int viewId) { 740 mItemAlignment.mainAxis().setItemAlignmentViewId(viewId); 741 updateChildAlignments(); 742 } 743 744 public int getItemAlignmentViewId() { 745 return mItemAlignment.mainAxis().getItemAlignmentViewId(); 746 } 747 748 public void setFocusOutAllowed(boolean throughFront, boolean throughEnd) { 749 mFocusOutFront = throughFront; 750 mFocusOutEnd = throughEnd; 751 } 752 753 public void setNumRows(int numRows) { 754 if (numRows < 0) throw new IllegalArgumentException(); 755 mNumRowsRequested = numRows; 756 } 757 758 /** 759 * Set the row height. May be WRAP_CONTENT, or a size in pixels. 760 */ 761 public void setRowHeight(int height) { 762 if (height >= 0 || height == ViewGroup.LayoutParams.WRAP_CONTENT) { 763 mRowSizeSecondaryRequested = height; 764 } else { 765 throw new IllegalArgumentException("Invalid row height: " + height); 766 } 767 } 768 769 public void setItemMargin(int margin) { 770 mVerticalMargin = mHorizontalMargin = margin; 771 mMarginPrimary = mMarginSecondary = margin; 772 } 773 774 public void setVerticalMargin(int margin) { 775 if (mOrientation == HORIZONTAL) { 776 mMarginSecondary = mVerticalMargin = margin; 777 } else { 778 mMarginPrimary = mVerticalMargin = margin; 779 } 780 } 781 782 public void setHorizontalMargin(int margin) { 783 if (mOrientation == HORIZONTAL) { 784 mMarginPrimary = mHorizontalMargin = margin; 785 } else { 786 mMarginSecondary = mHorizontalMargin = margin; 787 } 788 } 789 790 public int getVerticalMargin() { 791 return mVerticalMargin; 792 } 793 794 public int getHorizontalMargin() { 795 return mHorizontalMargin; 796 } 797 798 public void setGravity(int gravity) { 799 mGravity = gravity; 800 } 801 802 protected boolean hasDoneFirstLayout() { 803 return mGrid != null; 804 } 805 806 public void setOnChildSelectedListener(OnChildSelectedListener listener) { 807 mChildSelectedListener = listener; 808 } 809 810 public void setOnChildViewHolderSelectedListener(OnChildViewHolderSelectedListener listener) { 811 mChildViewHolderSelectedListener = listener; 812 } 813 814 void setOnChildLaidOutListener(OnChildLaidOutListener listener) { 815 mChildLaidOutListener = listener; 816 } 817 818 private int getPositionByView(View view) { 819 if (view == null) { 820 return NO_POSITION; 821 } 822 LayoutParams params = (LayoutParams) view.getLayoutParams(); 823 if (params == null || params.isItemRemoved()) { 824 // when item is removed, the position value can be any value. 825 return NO_POSITION; 826 } 827 return params.getViewPosition(); 828 } 829 830 private int getSubPositionByView(View view, View childView) { 831 if (view == null || childView == null) { 832 return 0; 833 } 834 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 835 final ItemAlignmentFacet facet = lp.getItemAlignmentFacet(); 836 if (facet != null) { 837 final ItemAlignmentFacet.ItemAlignmentDef[] defs = facet.getAlignmentDefs(); 838 if (defs.length > 1) { 839 while (childView != view) { 840 int id = childView.getId(); 841 if (id != View.NO_ID) { 842 for (int i = 1; i < defs.length; i++) { 843 if (defs[i].getItemAlignmentFocusViewId() == id) { 844 return i; 845 } 846 } 847 } 848 childView = (View) childView.getParent(); 849 } 850 } 851 } 852 return 0; 853 } 854 855 private int getPositionByIndex(int index) { 856 return getPositionByView(getChildAt(index)); 857 } 858 859 private void dispatchChildSelected() { 860 if (mChildSelectedListener == null && mChildViewHolderSelectedListener == null) { 861 return; 862 } 863 864 if (TRACE) TraceHelper.beginSection("onChildSelected"); 865 View view = mFocusPosition == NO_POSITION ? null : findViewByPosition(mFocusPosition); 866 if (view != null) { 867 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(view); 868 if (mChildSelectedListener != null) { 869 mChildSelectedListener.onChildSelected(mBaseGridView, view, mFocusPosition, 870 vh == null? NO_ID: vh.getItemId()); 871 } 872 if (mChildViewHolderSelectedListener != null) { 873 mChildViewHolderSelectedListener.onChildViewHolderSelected(mBaseGridView, vh, 874 mFocusPosition, mSubFocusPosition); 875 } 876 } else { 877 if (mChildSelectedListener != null) { 878 mChildSelectedListener.onChildSelected(mBaseGridView, null, NO_POSITION, NO_ID); 879 } 880 if (mChildViewHolderSelectedListener != null) { 881 mChildViewHolderSelectedListener.onChildViewHolderSelected(mBaseGridView, null, 882 NO_POSITION, 0); 883 } 884 } 885 if (TRACE) TraceHelper.endSection(); 886 887 // Children may request layout when a child selection event occurs (such as a change of 888 // padding on the current and previously selected rows). 889 // If in layout, a child requesting layout may have been laid out before the selection 890 // callback. 891 // If it was not, the child will be laid out after the selection callback. 892 // If so, the layout request will be honoured though the view system will emit a double- 893 // layout warning. 894 // If not in layout, we may be scrolling in which case the child layout request will be 895 // eaten by recyclerview. Post a requestLayout. 896 if (!mInLayout && !mBaseGridView.isLayoutRequested()) { 897 int childCount = getChildCount(); 898 for (int i = 0; i < childCount; i++) { 899 if (getChildAt(i).isLayoutRequested()) { 900 forceRequestLayout(); 901 break; 902 } 903 } 904 } 905 } 906 907 @Override 908 public boolean canScrollHorizontally() { 909 // We can scroll horizontally if we have horizontal orientation, or if 910 // we are vertical and have more than one column. 911 return mOrientation == HORIZONTAL || mNumRows > 1; 912 } 913 914 @Override 915 public boolean canScrollVertically() { 916 // We can scroll vertically if we have vertical orientation, or if we 917 // are horizontal and have more than one row. 918 return mOrientation == VERTICAL || mNumRows > 1; 919 } 920 921 @Override 922 public RecyclerView.LayoutParams generateDefaultLayoutParams() { 923 return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 924 ViewGroup.LayoutParams.WRAP_CONTENT); 925 } 926 927 @Override 928 public RecyclerView.LayoutParams generateLayoutParams(Context context, AttributeSet attrs) { 929 return new LayoutParams(context, attrs); 930 } 931 932 @Override 933 public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { 934 if (lp instanceof LayoutParams) { 935 return new LayoutParams((LayoutParams) lp); 936 } else if (lp instanceof RecyclerView.LayoutParams) { 937 return new LayoutParams((RecyclerView.LayoutParams) lp); 938 } else if (lp instanceof MarginLayoutParams) { 939 return new LayoutParams((MarginLayoutParams) lp); 940 } else { 941 return new LayoutParams(lp); 942 } 943 } 944 945 protected View getViewForPosition(int position) { 946 return mRecycler.getViewForPosition(position); 947 } 948 949 final int getOpticalLeft(View v) { 950 return ((LayoutParams) v.getLayoutParams()).getOpticalLeft(v); 951 } 952 953 final int getOpticalRight(View v) { 954 return ((LayoutParams) v.getLayoutParams()).getOpticalRight(v); 955 } 956 957 final int getOpticalTop(View v) { 958 return ((LayoutParams) v.getLayoutParams()).getOpticalTop(v); 959 } 960 961 final int getOpticalBottom(View v) { 962 return ((LayoutParams) v.getLayoutParams()).getOpticalBottom(v); 963 } 964 965 private int getViewMin(View v) { 966 return (mOrientation == HORIZONTAL) ? getOpticalLeft(v) : getOpticalTop(v); 967 } 968 969 private int getViewMax(View v) { 970 return (mOrientation == HORIZONTAL) ? getOpticalRight(v) : getOpticalBottom(v); 971 } 972 973 private int getViewPrimarySize(View view) { 974 LayoutParams p = (LayoutParams) view.getLayoutParams(); 975 return mOrientation == HORIZONTAL ? p.getOpticalWidth(view) : p.getOpticalHeight(view); 976 } 977 978 private int getViewCenter(View view) { 979 return (mOrientation == HORIZONTAL) ? getViewCenterX(view) : getViewCenterY(view); 980 } 981 982 private int getViewCenterSecondary(View view) { 983 return (mOrientation == HORIZONTAL) ? getViewCenterY(view) : getViewCenterX(view); 984 } 985 986 private int getViewCenterX(View v) { 987 LayoutParams p = (LayoutParams) v.getLayoutParams(); 988 return p.getOpticalLeft(v) + p.getAlignX(); 989 } 990 991 private int getViewCenterY(View v) { 992 LayoutParams p = (LayoutParams) v.getLayoutParams(); 993 return p.getOpticalTop(v) + p.getAlignY(); 994 } 995 996 /** 997 * Save Recycler and State for convenience. Must be paired with leaveContext(). 998 */ 999 private void saveContext(Recycler recycler, State state) { 1000 if (mRecycler != null || mState != null) { 1001 Log.e(TAG, "Recycler information was not released, bug!"); 1002 } 1003 mRecycler = recycler; 1004 mState = state; 1005 } 1006 1007 /** 1008 * Discard saved Recycler and State. 1009 */ 1010 private void leaveContext() { 1011 mRecycler = null; 1012 mState = null; 1013 } 1014 1015 /** 1016 * Re-initialize data structures for a data change or handling invisible 1017 * selection. The method tries its best to preserve position information so 1018 * that staggered grid looks same before and after re-initialize. 1019 * @return true if can fastRelayout() 1020 */ 1021 private boolean layoutInit() { 1022 boolean focusViewWasInTree = mGrid != null && mFocusPosition >= 0 1023 && mFocusPosition >= mGrid.getFirstVisibleIndex() 1024 && mFocusPosition <= mGrid.getLastVisibleIndex(); 1025 final int newItemCount = mState.getItemCount(); 1026 if (newItemCount == 0) { 1027 mFocusPosition = NO_POSITION; 1028 mSubFocusPosition = 0; 1029 } else if (mFocusPosition >= newItemCount) { 1030 mFocusPosition = newItemCount - 1; 1031 mSubFocusPosition = 0; 1032 } else if (mFocusPosition == NO_POSITION && newItemCount > 0) { 1033 // if focus position is never set before, initialize it to 0 1034 mFocusPosition = 0; 1035 mSubFocusPosition = 0; 1036 } 1037 if (!mState.didStructureChange() && mGrid.getFirstVisibleIndex() >= 0 && 1038 !mForceFullLayout && mGrid != null && mGrid.getNumRows() == mNumRows) { 1039 updateScrollController(); 1040 updateScrollSecondAxis(); 1041 mGrid.setMargin(mMarginPrimary); 1042 if (!focusViewWasInTree && mFocusPosition != NO_POSITION) { 1043 mGrid.setStart(mFocusPosition); 1044 } 1045 return true; 1046 } else { 1047 mForceFullLayout = false; 1048 int firstVisibleIndex = focusViewWasInTree ? mGrid.getFirstVisibleIndex() : 0; 1049 1050 if (mGrid == null || mNumRows != mGrid.getNumRows() || 1051 mReverseFlowPrimary != mGrid.isReversedFlow()) { 1052 mGrid = Grid.createGrid(mNumRows); 1053 mGrid.setProvider(mGridProvider); 1054 mGrid.setReversedFlow(mReverseFlowPrimary); 1055 } 1056 initScrollController(); 1057 updateScrollSecondAxis(); 1058 mGrid.setMargin(mMarginPrimary); 1059 detachAndScrapAttachedViews(mRecycler); 1060 mGrid.resetVisibleIndex(); 1061 if (mFocusPosition == NO_POSITION) { 1062 mBaseGridView.clearFocus(); 1063 } 1064 mWindowAlignment.mainAxis().invalidateScrollMin(); 1065 mWindowAlignment.mainAxis().invalidateScrollMax(); 1066 if (focusViewWasInTree && firstVisibleIndex <= mFocusPosition) { 1067 // if focusView was in tree, we will add item from first visible item 1068 mGrid.setStart(firstVisibleIndex); 1069 } else { 1070 // if focusView was not in tree, it's probably because focus position jumped 1071 // far away from visible range, so use mFocusPosition as start 1072 mGrid.setStart(mFocusPosition); 1073 } 1074 return false; 1075 } 1076 } 1077 1078 private int getRowSizeSecondary(int rowIndex) { 1079 if (mFixedRowSizeSecondary != 0) { 1080 return mFixedRowSizeSecondary; 1081 } 1082 if (mRowSizeSecondary == null) { 1083 return 0; 1084 } 1085 return mRowSizeSecondary[rowIndex]; 1086 } 1087 1088 private int getRowStartSecondary(int rowIndex) { 1089 int start = 0; 1090 // Iterate from left to right, which is a different index traversal 1091 // in RTL flow 1092 if (mReverseFlowSecondary) { 1093 for (int i = mNumRows-1; i > rowIndex; i--) { 1094 start += getRowSizeSecondary(i) + mMarginSecondary; 1095 } 1096 } else { 1097 for (int i = 0; i < rowIndex; i++) { 1098 start += getRowSizeSecondary(i) + mMarginSecondary; 1099 } 1100 } 1101 return start; 1102 } 1103 1104 private int getSizeSecondary() { 1105 int rightmostIndex = mReverseFlowSecondary ? 0 : mNumRows - 1; 1106 return getRowStartSecondary(rightmostIndex) + getRowSizeSecondary(rightmostIndex); 1107 } 1108 1109 private void measureScrapChild(int position, int widthSpec, int heightSpec, 1110 int[] measuredDimension) { 1111 View view = mRecycler.getViewForPosition(position); 1112 if (view != null) { 1113 LayoutParams p = (LayoutParams) view.getLayoutParams(); 1114 int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, 1115 getPaddingLeft() + getPaddingRight(), p.width); 1116 int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, 1117 getPaddingTop() + getPaddingBottom(), p.height); 1118 view.measure(childWidthSpec, childHeightSpec); 1119 measuredDimension[0] = view.getMeasuredWidth(); 1120 measuredDimension[1] = view.getMeasuredHeight(); 1121 mRecycler.recycleView(view); 1122 } 1123 } 1124 1125 private boolean processRowSizeSecondary(boolean measure) { 1126 if (mFixedRowSizeSecondary != 0 || mRowSizeSecondary == null) { 1127 return false; 1128 } 1129 1130 if (TRACE) TraceHelper.beginSection("processRowSizeSecondary"); 1131 CircularIntArray[] rows = mGrid == null ? null : mGrid.getItemPositionsInRows(); 1132 boolean changed = false; 1133 int scrapChildWidth = -1; 1134 int scrapChildHeight = -1; 1135 1136 for (int rowIndex = 0; rowIndex < mNumRows; rowIndex++) { 1137 CircularIntArray row = rows == null ? null : rows[rowIndex]; 1138 final int rowItemsPairCount = row == null ? 0 : row.size(); 1139 int rowSize = -1; 1140 for (int rowItemPairIndex = 0; rowItemPairIndex < rowItemsPairCount; 1141 rowItemPairIndex += 2) { 1142 final int rowIndexStart = row.get(rowItemPairIndex); 1143 final int rowIndexEnd = row.get(rowItemPairIndex + 1); 1144 for (int i = rowIndexStart; i <= rowIndexEnd; i++) { 1145 final View view = findViewByPosition(i); 1146 if (view == null) { 1147 continue; 1148 } 1149 if (measure && view.isLayoutRequested()) { 1150 measureChild(view); 1151 } 1152 final int secondarySize = mOrientation == HORIZONTAL ? 1153 view.getMeasuredHeight() : view.getMeasuredWidth(); 1154 if (secondarySize > rowSize) { 1155 rowSize = secondarySize; 1156 } 1157 } 1158 } 1159 1160 final int itemCount = mState.getItemCount(); 1161 if (measure && rowSize < 0 && itemCount > 0) { 1162 if (scrapChildWidth < 0 && scrapChildHeight < 0) { 1163 int position; 1164 if (mFocusPosition == NO_POSITION) { 1165 position = 0; 1166 } else if (mFocusPosition >= itemCount) { 1167 position = itemCount - 1; 1168 } else { 1169 position = mFocusPosition; 1170 } 1171 measureScrapChild(position, 1172 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1173 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1174 mMeasuredDimension); 1175 scrapChildWidth = mMeasuredDimension[0]; 1176 scrapChildHeight = mMeasuredDimension[1]; 1177 if (DEBUG) Log.v(TAG, "measured scrap child: " + scrapChildWidth + 1178 " " + scrapChildHeight); 1179 } 1180 rowSize = mOrientation == HORIZONTAL ? scrapChildHeight : scrapChildWidth; 1181 } 1182 if (rowSize < 0) { 1183 rowSize = 0; 1184 } 1185 if (mRowSizeSecondary[rowIndex] != rowSize) { 1186 if (DEBUG) Log.v(getTag(), "row size secondary changed: " + mRowSizeSecondary[rowIndex] + 1187 ", " + rowSize); 1188 mRowSizeSecondary[rowIndex] = rowSize; 1189 changed = true; 1190 } 1191 } 1192 1193 if (TRACE) TraceHelper.endSection(); 1194 return changed; 1195 } 1196 1197 /** 1198 * Checks if we need to update row secondary sizes. 1199 */ 1200 private void updateRowSecondarySizeRefresh() { 1201 mRowSecondarySizeRefresh = processRowSizeSecondary(false); 1202 if (mRowSecondarySizeRefresh) { 1203 if (DEBUG) Log.v(getTag(), "mRowSecondarySizeRefresh now set"); 1204 forceRequestLayout(); 1205 } 1206 } 1207 1208 private void forceRequestLayout() { 1209 if (DEBUG) Log.v(getTag(), "forceRequestLayout"); 1210 // RecyclerView prevents us from requesting layout in many cases 1211 // (during layout, during scroll, etc.) 1212 // For secondary row size wrap_content support we currently need a 1213 // second layout pass to update the measured size after having measured 1214 // and added child views in layoutChildren. 1215 // Force the second layout by posting a delayed runnable. 1216 // TODO: investigate allowing a second layout pass, 1217 // or move child add/measure logic to the measure phase. 1218 ViewCompat.postOnAnimation(mBaseGridView, mRequestLayoutRunnable); 1219 } 1220 1221 private final Runnable mRequestLayoutRunnable = new Runnable() { 1222 @Override 1223 public void run() { 1224 if (DEBUG) Log.v(getTag(), "request Layout from runnable"); 1225 requestLayout(); 1226 } 1227 }; 1228 1229 @Override 1230 public void onMeasure(Recycler recycler, State state, int widthSpec, int heightSpec) { 1231 saveContext(recycler, state); 1232 1233 int sizePrimary, sizeSecondary, modeSecondary, paddingSecondary; 1234 int measuredSizeSecondary; 1235 if (mOrientation == HORIZONTAL) { 1236 sizePrimary = MeasureSpec.getSize(widthSpec); 1237 sizeSecondary = MeasureSpec.getSize(heightSpec); 1238 modeSecondary = MeasureSpec.getMode(heightSpec); 1239 paddingSecondary = getPaddingTop() + getPaddingBottom(); 1240 } else { 1241 sizeSecondary = MeasureSpec.getSize(widthSpec); 1242 sizePrimary = MeasureSpec.getSize(heightSpec); 1243 modeSecondary = MeasureSpec.getMode(widthSpec); 1244 paddingSecondary = getPaddingLeft() + getPaddingRight(); 1245 } 1246 if (DEBUG) Log.v(getTag(), "onMeasure widthSpec " + Integer.toHexString(widthSpec) + 1247 " heightSpec " + Integer.toHexString(heightSpec) + 1248 " modeSecondary " + Integer.toHexString(modeSecondary) + 1249 " sizeSecondary " + sizeSecondary + " " + this); 1250 1251 mMaxSizeSecondary = sizeSecondary; 1252 1253 if (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) { 1254 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1255 mFixedRowSizeSecondary = 0; 1256 1257 if (mRowSizeSecondary == null || mRowSizeSecondary.length != mNumRows) { 1258 mRowSizeSecondary = new int[mNumRows]; 1259 } 1260 1261 // Measure all current children and update cached row heights 1262 processRowSizeSecondary(true); 1263 1264 switch (modeSecondary) { 1265 case MeasureSpec.UNSPECIFIED: 1266 measuredSizeSecondary = getSizeSecondary() + paddingSecondary; 1267 break; 1268 case MeasureSpec.AT_MOST: 1269 measuredSizeSecondary = Math.min(getSizeSecondary() + paddingSecondary, 1270 mMaxSizeSecondary); 1271 break; 1272 case MeasureSpec.EXACTLY: 1273 measuredSizeSecondary = mMaxSizeSecondary; 1274 break; 1275 default: 1276 throw new IllegalStateException("wrong spec"); 1277 } 1278 1279 } else { 1280 switch (modeSecondary) { 1281 case MeasureSpec.UNSPECIFIED: 1282 if (mRowSizeSecondaryRequested == 0) { 1283 if (mOrientation == HORIZONTAL) { 1284 throw new IllegalStateException("Must specify rowHeight or view height"); 1285 } else { 1286 throw new IllegalStateException("Must specify columnWidth or view width"); 1287 } 1288 } 1289 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1290 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 1291 measuredSizeSecondary = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1292 * (mNumRows - 1) + paddingSecondary; 1293 break; 1294 case MeasureSpec.AT_MOST: 1295 case MeasureSpec.EXACTLY: 1296 if (mNumRowsRequested == 0 && mRowSizeSecondaryRequested == 0) { 1297 mNumRows = 1; 1298 mFixedRowSizeSecondary = sizeSecondary - paddingSecondary; 1299 } else if (mNumRowsRequested == 0) { 1300 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1301 mNumRows = (sizeSecondary + mMarginSecondary) 1302 / (mRowSizeSecondaryRequested + mMarginSecondary); 1303 } else if (mRowSizeSecondaryRequested == 0) { 1304 mNumRows = mNumRowsRequested; 1305 mFixedRowSizeSecondary = (sizeSecondary - paddingSecondary - mMarginSecondary 1306 * (mNumRows - 1)) / mNumRows; 1307 } else { 1308 mNumRows = mNumRowsRequested; 1309 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1310 } 1311 measuredSizeSecondary = sizeSecondary; 1312 if (modeSecondary == MeasureSpec.AT_MOST) { 1313 int childrenSize = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1314 * (mNumRows - 1) + paddingSecondary; 1315 if (childrenSize < measuredSizeSecondary) { 1316 measuredSizeSecondary = childrenSize; 1317 } 1318 } 1319 break; 1320 default: 1321 throw new IllegalStateException("wrong spec"); 1322 } 1323 } 1324 if (mOrientation == HORIZONTAL) { 1325 setMeasuredDimension(sizePrimary, measuredSizeSecondary); 1326 } else { 1327 setMeasuredDimension(measuredSizeSecondary, sizePrimary); 1328 } 1329 if (DEBUG) { 1330 Log.v(getTag(), "onMeasure sizePrimary " + sizePrimary + 1331 " measuredSizeSecondary " + measuredSizeSecondary + 1332 " mFixedRowSizeSecondary " + mFixedRowSizeSecondary + 1333 " mNumRows " + mNumRows); 1334 } 1335 leaveContext(); 1336 } 1337 1338 private void measureChild(View child) { 1339 if (TRACE) TraceHelper.beginSection("measureChild"); 1340 final ViewGroup.LayoutParams lp = child.getLayoutParams(); 1341 final int secondarySpec = (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) ? 1342 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) : 1343 MeasureSpec.makeMeasureSpec(mFixedRowSizeSecondary, MeasureSpec.EXACTLY); 1344 int widthSpec, heightSpec; 1345 1346 if (mOrientation == HORIZONTAL) { 1347 widthSpec = ViewGroup.getChildMeasureSpec( 1348 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1349 0, lp.width); 1350 heightSpec = ViewGroup.getChildMeasureSpec(secondarySpec, 0, lp.height); 1351 } else { 1352 heightSpec = ViewGroup.getChildMeasureSpec( 1353 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1354 0, lp.height); 1355 widthSpec = ViewGroup.getChildMeasureSpec(secondarySpec, 0, lp.width); 1356 } 1357 child.measure(widthSpec, heightSpec); 1358 if (DEBUG) Log.v(getTag(), "measureChild secondarySpec " + Integer.toHexString(secondarySpec) + 1359 " widthSpec " + Integer.toHexString(widthSpec) + 1360 " heightSpec " + Integer.toHexString(heightSpec) + 1361 " measuredWidth " + child.getMeasuredWidth() + 1362 " measuredHeight " + child.getMeasuredHeight()); 1363 if (DEBUG) Log.v(getTag(), "child lp width " + lp.width + " height " + lp.height); 1364 if (TRACE) TraceHelper.endSection(); 1365 } 1366 1367 /** 1368 * Get facet from the ViewHolder or the viewType. 1369 */ 1370 private <E> E getFacet(RecyclerView.ViewHolder vh, Class<? extends E> facetClass) { 1371 E facet = null; 1372 if (vh instanceof FacetProvider) { 1373 facet = (E) ((FacetProvider) vh).getFacet(facetClass); 1374 } 1375 if (facet == null && mFacetProviderAdapter != null) { 1376 FacetProvider p = mFacetProviderAdapter.getFacetProvider(vh.getItemViewType()); 1377 if (p != null) { 1378 facet = (E) p.getFacet(facetClass); 1379 } 1380 } 1381 return facet; 1382 } 1383 1384 private Grid.Provider mGridProvider = new Grid.Provider() { 1385 1386 @Override 1387 public int getCount() { 1388 return mState.getItemCount(); 1389 } 1390 1391 @Override 1392 public int createItem(int index, boolean append, Object[] item) { 1393 if (TRACE) TraceHelper.beginSection("createItem"); 1394 if (TRACE) TraceHelper.beginSection("getview"); 1395 View v = getViewForPosition(index); 1396 if (TRACE) TraceHelper.endSection(); 1397 LayoutParams lp = (LayoutParams) v.getLayoutParams(); 1398 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1399 lp.setItemAlignmentFacet((ItemAlignmentFacet)getFacet(vh, ItemAlignmentFacet.class)); 1400 // See recyclerView docs: we don't need re-add scraped view if it was removed. 1401 if (!lp.isItemRemoved()) { 1402 if (TRACE) TraceHelper.beginSection("addView"); 1403 if (append) { 1404 addView(v); 1405 } else { 1406 addView(v, 0); 1407 } 1408 if (TRACE) TraceHelper.endSection(); 1409 if (mChildVisibility != -1) { 1410 v.setVisibility(mChildVisibility); 1411 } 1412 1413 if (mPendingMoveSmoothScroller != null) { 1414 mPendingMoveSmoothScroller.consumePendingMovesBeforeLayout(); 1415 } 1416 int subindex = getSubPositionByView(v, v.findFocus()); 1417 if (!mInLayout) { 1418 // when we are appending item during scroll pass and the item's position 1419 // matches the mFocusPosition, we should signal a childSelected event. 1420 // However if we are still running PendingMoveSmoothScroller, we defer and 1421 // signal the event in PendingMoveSmoothScroller.onStop(). This can 1422 // avoid lots of childSelected events during a long smooth scrolling and 1423 // increase performance. 1424 if (index == mFocusPosition && subindex == mSubFocusPosition 1425 && (mPendingMoveSmoothScroller == null 1426 || mPendingMoveSmoothScroller.mPendingMoves == 0)) { 1427 dispatchChildSelected(); 1428 } 1429 } else if (!mInFastRelayout) { 1430 // fastRelayout will dispatch event at end of onLayoutChildren(). 1431 // For full layout, two situations here: 1432 // 1. mInLayoutSearchFocus is false, dispatchChildSelected() at mFocusPosition. 1433 // 2. mInLayoutSearchFocus is true: dispatchChildSelected() on first child 1434 // equal to or after mFocusPosition that can take focus. 1435 if (!mInLayoutSearchFocus && index == mFocusPosition 1436 && subindex == mSubFocusPosition) { 1437 dispatchChildSelected(); 1438 } else if (mInLayoutSearchFocus && index >= mFocusPosition 1439 && v.hasFocusable()) { 1440 mFocusPosition = index; 1441 mSubFocusPosition = subindex; 1442 mInLayoutSearchFocus = false; 1443 dispatchChildSelected(); 1444 } 1445 } 1446 measureChild(v); 1447 } 1448 item[0] = v; 1449 return mOrientation == HORIZONTAL ? v.getMeasuredWidth() : v.getMeasuredHeight(); 1450 } 1451 1452 @Override 1453 public void addItem(Object item, int index, int length, int rowIndex, int edge) { 1454 View v = (View) item; 1455 int start, end; 1456 if (edge == Integer.MIN_VALUE || edge == Integer.MAX_VALUE) { 1457 edge = !mGrid.isReversedFlow() ? mWindowAlignment.mainAxis().getPaddingLow() 1458 : mWindowAlignment.mainAxis().getSize() 1459 - mWindowAlignment.mainAxis().getPaddingHigh(); 1460 } 1461 boolean edgeIsMin = !mGrid.isReversedFlow(); 1462 if (edgeIsMin) { 1463 start = edge; 1464 end = edge + length; 1465 } else { 1466 start = edge - length; 1467 end = edge; 1468 } 1469 int startSecondary = getRowStartSecondary(rowIndex) - mScrollOffsetSecondary; 1470 mChildrenStates.loadView(v, index); 1471 layoutChild(rowIndex, v, start, end, startSecondary); 1472 if (DEBUG) { 1473 Log.d(getTag(), "addView " + index + " " + v); 1474 } 1475 if (TRACE) TraceHelper.endSection(); 1476 1477 if (index == mGrid.getFirstVisibleIndex()) { 1478 if (!mGrid.isReversedFlow()) { 1479 updateScrollMin(); 1480 } else { 1481 updateScrollMax(); 1482 } 1483 } 1484 if (index == mGrid.getLastVisibleIndex()) { 1485 if (!mGrid.isReversedFlow()) { 1486 updateScrollMax(); 1487 } else { 1488 updateScrollMin(); 1489 } 1490 } 1491 if (!mInLayout && mPendingMoveSmoothScroller != null) { 1492 mPendingMoveSmoothScroller.consumePendingMovesAfterLayout(); 1493 } 1494 if (mChildLaidOutListener != null) { 1495 RecyclerView.ViewHolder vh = mBaseGridView.getChildViewHolder(v); 1496 mChildLaidOutListener.onChildLaidOut(mBaseGridView, v, index, 1497 vh == null ? NO_ID : vh.getItemId()); 1498 } 1499 } 1500 1501 @Override 1502 public void removeItem(int index) { 1503 if (TRACE) TraceHelper.beginSection("removeItem"); 1504 View v = findViewByPosition(index); 1505 if (mInLayout) { 1506 detachAndScrapView(v, mRecycler); 1507 } else { 1508 removeAndRecycleView(v, mRecycler); 1509 } 1510 if (TRACE) TraceHelper.endSection(); 1511 } 1512 1513 @Override 1514 public int getEdge(int index) { 1515 if (mReverseFlowPrimary) { 1516 return getViewMax(findViewByPosition(index)); 1517 } else { 1518 return getViewMin(findViewByPosition(index)); 1519 } 1520 } 1521 1522 @Override 1523 public int getSize(int index) { 1524 return getViewPrimarySize(findViewByPosition(index)); 1525 } 1526 }; 1527 1528 private void layoutChild(int rowIndex, View v, int start, int end, int startSecondary) { 1529 if (TRACE) TraceHelper.beginSection("layoutChild"); 1530 int sizeSecondary = mOrientation == HORIZONTAL ? v.getMeasuredHeight() 1531 : v.getMeasuredWidth(); 1532 if (mFixedRowSizeSecondary > 0) { 1533 sizeSecondary = Math.min(sizeSecondary, mFixedRowSizeSecondary); 1534 } 1535 final int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; 1536 final int horizontalGravity = (mReverseFlowPrimary || mReverseFlowSecondary) ? 1537 Gravity.getAbsoluteGravity(mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK, View.LAYOUT_DIRECTION_RTL) : 1538 mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; 1539 if (mOrientation == HORIZONTAL && verticalGravity == Gravity.TOP 1540 || mOrientation == VERTICAL && horizontalGravity == Gravity.LEFT) { 1541 // do nothing 1542 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.BOTTOM 1543 || mOrientation == VERTICAL && horizontalGravity == Gravity.RIGHT) { 1544 startSecondary += getRowSizeSecondary(rowIndex) - sizeSecondary; 1545 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.CENTER_VERTICAL 1546 || mOrientation == VERTICAL && horizontalGravity == Gravity.CENTER_HORIZONTAL) { 1547 startSecondary += (getRowSizeSecondary(rowIndex) - sizeSecondary) / 2; 1548 } 1549 int left, top, right, bottom; 1550 if (mOrientation == HORIZONTAL) { 1551 left = start; 1552 top = startSecondary; 1553 right = end; 1554 bottom = startSecondary + sizeSecondary; 1555 } else { 1556 top = start; 1557 left = startSecondary; 1558 bottom = end; 1559 right = startSecondary + sizeSecondary; 1560 } 1561 v.layout(left, top, right, bottom); 1562 updateChildOpticalInsets(v, left, top, right, bottom); 1563 updateChildAlignments(v); 1564 if (TRACE) TraceHelper.endSection(); 1565 } 1566 1567 private void updateChildOpticalInsets(View v, int left, int top, int right, int bottom) { 1568 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1569 p.setOpticalInsets(left - v.getLeft(), top - v.getTop(), 1570 v.getRight() - right, v.getBottom() - bottom); 1571 } 1572 1573 private void updateChildAlignments(View v) { 1574 final LayoutParams p = (LayoutParams) v.getLayoutParams(); 1575 if (p.getItemAlignmentFacet() == null) { 1576 // Fallback to global settings on grid view 1577 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1578 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1579 } else { 1580 // Use ItemAlignmentFacet defined on specific ViewHolder 1581 p.calculateItemAlignments(mOrientation, v); 1582 if (mOrientation == HORIZONTAL) { 1583 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1584 } else { 1585 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1586 } 1587 } 1588 } 1589 1590 private void updateChildAlignments() { 1591 for (int i = 0, c = getChildCount(); i < c; i++) { 1592 updateChildAlignments(getChildAt(i)); 1593 } 1594 } 1595 1596 void setExtraLayoutSpace(int extraLayoutSpace) { 1597 if (mExtraLayoutSpace == extraLayoutSpace) { 1598 return; 1599 } else if (mExtraLayoutSpace < 0) { 1600 throw new IllegalArgumentException("ExtraLayoutSpace must >= 0"); 1601 } 1602 mExtraLayoutSpace = extraLayoutSpace; 1603 requestLayout(); 1604 } 1605 1606 int getExtraLayoutSpace() { 1607 return mExtraLayoutSpace; 1608 } 1609 1610 private void removeInvisibleViewsAtEnd() { 1611 if (mPruneChild) { 1612 mGrid.removeInvisibleItemsAtEnd(mFocusPosition, 1613 mReverseFlowPrimary ? -mExtraLayoutSpace : mSizePrimary + mExtraLayoutSpace); 1614 } 1615 } 1616 1617 private void removeInvisibleViewsAtFront() { 1618 if (mPruneChild) { 1619 mGrid.removeInvisibleItemsAtFront(mFocusPosition, 1620 mReverseFlowPrimary ? mSizePrimary + mExtraLayoutSpace: -mExtraLayoutSpace); 1621 } 1622 } 1623 1624 private boolean appendOneColumnVisibleItems() { 1625 return mGrid.appendOneColumnVisibleItems(); 1626 } 1627 1628 private boolean prependOneColumnVisibleItems() { 1629 return mGrid.prependOneColumnVisibleItems(); 1630 } 1631 1632 private void appendVisibleItems() { 1633 mGrid.appendVisibleItems(mReverseFlowPrimary ? -mExtraLayoutSpace 1634 : mSizePrimary + mExtraLayoutSpace); 1635 } 1636 1637 private void prependVisibleItems() { 1638 mGrid.prependVisibleItems(mReverseFlowPrimary ? mSizePrimary + mExtraLayoutSpace 1639 : -mExtraLayoutSpace); 1640 } 1641 1642 /** 1643 * Fast layout when there is no structure change, adapter change, etc. 1644 * It will layout all views was layout requested or updated, until hit a view 1645 * with different size, then it break and detachAndScrap all views after that. 1646 */ 1647 private void fastRelayout() { 1648 boolean invalidateAfter = false; 1649 final int childCount = getChildCount(); 1650 int position = -1; 1651 for (int index = 0; index < childCount; index++) { 1652 View view = getChildAt(index); 1653 position = getPositionByIndex(index); 1654 Grid.Location location = mGrid.getLocation(position); 1655 if (location == null) { 1656 if (DEBUG) Log.w(getTag(), "fastRelayout(): no Location at " + position); 1657 invalidateAfter = true; 1658 break; 1659 } 1660 1661 int startSecondary = getRowStartSecondary(location.row) - mScrollOffsetSecondary; 1662 int primarySize, end; 1663 int start = getViewMin(view); 1664 int oldPrimarySize = getViewPrimarySize(view); 1665 1666 LayoutParams lp = (LayoutParams) view.getLayoutParams(); 1667 if (lp.viewNeedsUpdate()) { 1668 int viewIndex = mBaseGridView.indexOfChild(view); 1669 detachAndScrapView(view, mRecycler); 1670 view = getViewForPosition(position); 1671 addView(view, viewIndex); 1672 } 1673 1674 if (view.isLayoutRequested()) { 1675 measureChild(view); 1676 } 1677 if (mOrientation == HORIZONTAL) { 1678 primarySize = view.getMeasuredWidth(); 1679 end = start + primarySize; 1680 } else { 1681 primarySize = view.getMeasuredHeight(); 1682 end = start + primarySize; 1683 } 1684 layoutChild(location.row, view, start, end, startSecondary); 1685 if (oldPrimarySize != primarySize) { 1686 // size changed invalidate remaining Locations 1687 if (DEBUG) Log.d(getTag(), "fastRelayout: view size changed at " + position); 1688 invalidateAfter = true; 1689 break; 1690 } 1691 } 1692 if (invalidateAfter) { 1693 final int savedLastPos = mGrid.getLastVisibleIndex(); 1694 mGrid.invalidateItemsAfter(position); 1695 if (mPruneChild) { 1696 // in regular prune child mode, we just append items up to edge limit 1697 appendVisibleItems(); 1698 if (mFocusPosition >= 0 && mFocusPosition <= savedLastPos) { 1699 // make sure add focus view back: the view might be outside edge limit 1700 // when there is delta in onLayoutChildren(). 1701 while (mGrid.getLastVisibleIndex() < mFocusPosition) { 1702 mGrid.appendOneColumnVisibleItems(); 1703 } 1704 } 1705 } else { 1706 // prune disabled(e.g. in RowsFragment transition): append all removed items 1707 while (mGrid.appendOneColumnVisibleItems() 1708 && mGrid.getLastVisibleIndex() < savedLastPos); 1709 } 1710 } 1711 updateScrollMin(); 1712 updateScrollMax(); 1713 updateScrollSecondAxis(); 1714 } 1715 1716 public void removeAndRecycleAllViews(RecyclerView.Recycler recycler) { 1717 if (TRACE) TraceHelper.beginSection("removeAndRecycleAllViews"); 1718 if (DEBUG) Log.v(TAG, "removeAndRecycleAllViews " + getChildCount()); 1719 for (int i = getChildCount() - 1; i >= 0; i--) { 1720 removeAndRecycleViewAt(i, recycler); 1721 } 1722 if (TRACE) TraceHelper.endSection(); 1723 } 1724 1725 // Lays out items based on the current scroll position 1726 @Override 1727 public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { 1728 if (DEBUG) { 1729 Log.v(getTag(), "layoutChildren start numRows " + mNumRows + " mScrollOffsetSecondary " 1730 + mScrollOffsetSecondary + " mScrollOffsetPrimary " + mScrollOffsetPrimary 1731 + " inPreLayout " + state.isPreLayout() 1732 + " didStructureChange " + state.didStructureChange() 1733 + " mForceFullLayout " + mForceFullLayout); 1734 Log.v(getTag(), "width " + getWidth() + " height " + getHeight()); 1735 } 1736 1737 if (mNumRows == 0) { 1738 // haven't done measure yet 1739 return; 1740 } 1741 final int itemCount = state.getItemCount(); 1742 if (itemCount < 0) { 1743 return; 1744 } 1745 1746 if (!mLayoutEnabled) { 1747 discardLayoutInfo(); 1748 removeAndRecycleAllViews(recycler); 1749 return; 1750 } 1751 mInLayout = true; 1752 1753 final boolean scrollToFocus = !isSmoothScrolling() 1754 && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED; 1755 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 1756 mFocusPosition = mFocusPosition + mFocusPositionOffset; 1757 mSubFocusPosition = 0; 1758 } 1759 mFocusPositionOffset = 0; 1760 saveContext(recycler, state); 1761 1762 // Track the old focus view so we can adjust our system scroll position 1763 // so that any scroll animations happening now will remain valid. 1764 // We must use same delta in Pre Layout (if prelayout exists) and second layout. 1765 // So we cache the deltas in PreLayout and use it in second layout. 1766 int delta = 0, deltaSecondary = 0; 1767 if (mFocusPosition != NO_POSITION && scrollToFocus 1768 && mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) { 1769 // FIXME: we should get the remaining scroll animation offset from RecyclerView 1770 View focusView = findViewByPosition(mFocusPosition); 1771 if (focusView != null) { 1772 getScrollPosition(focusView, focusView.findFocus(), sTwoInts); 1773 delta = sTwoInts[0]; 1774 deltaSecondary = sTwoInts[1]; 1775 } 1776 } 1777 1778 boolean hadFocus = mBaseGridView.hasFocus(); 1779 int savedFocusPos = mFocusPosition; 1780 if (mInFastRelayout = layoutInit()) { 1781 fastRelayout(); 1782 // appends items till focus position. 1783 if (mFocusPosition != NO_POSITION) { 1784 View focusView = findViewByPosition(mFocusPosition); 1785 if (focusView != null) { 1786 if (scrollToFocus) { 1787 scrollToView(focusView, false); 1788 } 1789 if (hadFocus && !focusView.hasFocus()) { 1790 focusView.requestFocus(); 1791 } 1792 } 1793 } 1794 } else { 1795 mInLayoutSearchFocus = hadFocus; 1796 if (mFocusPosition != NO_POSITION) { 1797 // appends items till focus position. 1798 while (appendOneColumnVisibleItems() 1799 && findViewByPosition(mFocusPosition) == null) ; 1800 } 1801 // multiple rounds: scrollToView of first round may drag first/last child into 1802 // "visible window" and we update scrollMin/scrollMax then run second scrollToView 1803 int oldFirstVisible; 1804 int oldLastVisible; 1805 do { 1806 updateScrollMin(); 1807 updateScrollMax(); 1808 oldFirstVisible = mGrid.getFirstVisibleIndex(); 1809 oldLastVisible = mGrid.getLastVisibleIndex(); 1810 View focusView = findViewByPosition(mFocusPosition); 1811 // we need force to initialize the child view's position 1812 scrollToView(focusView, false); 1813 if (focusView != null && hadFocus && !focusView.hasFocus()) { 1814 focusView.requestFocus(); 1815 } 1816 appendVisibleItems(); 1817 prependVisibleItems(); 1818 removeInvisibleViewsAtFront(); 1819 removeInvisibleViewsAtEnd(); 1820 } while (mGrid.getFirstVisibleIndex() != oldFirstVisible || 1821 mGrid.getLastVisibleIndex() != oldLastVisible); 1822 } 1823 1824 if (scrollToFocus) { 1825 scrollDirectionPrimary(-delta); 1826 scrollDirectionSecondary(-deltaSecondary); 1827 } 1828 appendVisibleItems(); 1829 prependVisibleItems(); 1830 removeInvisibleViewsAtFront(); 1831 removeInvisibleViewsAtEnd(); 1832 1833 if (DEBUG) { 1834 StringWriter sw = new StringWriter(); 1835 PrintWriter pw = new PrintWriter(sw); 1836 mGrid.debugPrint(pw); 1837 Log.d(getTag(), sw.toString()); 1838 } 1839 1840 if (mRowSecondarySizeRefresh) { 1841 mRowSecondarySizeRefresh = false; 1842 } else { 1843 updateRowSecondarySizeRefresh(); 1844 } 1845 1846 // For fastRelayout, only dispatch event when focus position changes. 1847 if (mInFastRelayout && mFocusPosition != savedFocusPos) { 1848 dispatchChildSelected(); 1849 } else if (!mInFastRelayout && mInLayoutSearchFocus) { 1850 // For full layout we dispatchChildSelected() in createItem() unless searched all 1851 // children and found none is focusable then dispatchChildSelected() here. 1852 dispatchChildSelected(); 1853 } 1854 1855 mInLayout = false; 1856 leaveContext(); 1857 if (DEBUG) Log.v(getTag(), "layoutChildren end"); 1858 } 1859 1860 private void offsetChildrenSecondary(int increment) { 1861 final int childCount = getChildCount(); 1862 if (mOrientation == HORIZONTAL) { 1863 for (int i = 0; i < childCount; i++) { 1864 getChildAt(i).offsetTopAndBottom(increment); 1865 } 1866 } else { 1867 for (int i = 0; i < childCount; i++) { 1868 getChildAt(i).offsetLeftAndRight(increment); 1869 } 1870 } 1871 } 1872 1873 private void offsetChildrenPrimary(int increment) { 1874 final int childCount = getChildCount(); 1875 if (mOrientation == VERTICAL) { 1876 for (int i = 0; i < childCount; i++) { 1877 getChildAt(i).offsetTopAndBottom(increment); 1878 } 1879 } else { 1880 for (int i = 0; i < childCount; i++) { 1881 getChildAt(i).offsetLeftAndRight(increment); 1882 } 1883 } 1884 } 1885 1886 @Override 1887 public int scrollHorizontallyBy(int dx, Recycler recycler, RecyclerView.State state) { 1888 if (DEBUG) Log.v(getTag(), "scrollHorizontallyBy " + dx); 1889 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1890 return 0; 1891 } 1892 saveContext(recycler, state); 1893 mInScroll = true; 1894 int result; 1895 if (mOrientation == HORIZONTAL) { 1896 result = scrollDirectionPrimary(dx); 1897 } else { 1898 result = scrollDirectionSecondary(dx); 1899 } 1900 leaveContext(); 1901 mInScroll = false; 1902 return result; 1903 } 1904 1905 @Override 1906 public int scrollVerticallyBy(int dy, Recycler recycler, RecyclerView.State state) { 1907 if (DEBUG) Log.v(getTag(), "scrollVerticallyBy " + dy); 1908 if (!mLayoutEnabled || !hasDoneFirstLayout()) { 1909 return 0; 1910 } 1911 mInScroll = true; 1912 saveContext(recycler, state); 1913 int result; 1914 if (mOrientation == VERTICAL) { 1915 result = scrollDirectionPrimary(dy); 1916 } else { 1917 result = scrollDirectionSecondary(dy); 1918 } 1919 leaveContext(); 1920 mInScroll = false; 1921 return result; 1922 } 1923 1924 // scroll in main direction may add/prune views 1925 private int scrollDirectionPrimary(int da) { 1926 if (TRACE) TraceHelper.beginSection("scrollPrimary"); 1927 boolean isMaxUnknown = false, isMinUnknown = false; 1928 int minScroll = 0, maxScroll = 0; 1929 if (da > 0) { 1930 isMaxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 1931 if (!isMaxUnknown) { 1932 maxScroll = mWindowAlignment.mainAxis().getMaxScroll(); 1933 if (mScrollOffsetPrimary + da > maxScroll) { 1934 da = maxScroll - mScrollOffsetPrimary; 1935 } 1936 } 1937 } else if (da < 0) { 1938 isMinUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 1939 if (!isMinUnknown) { 1940 minScroll = mWindowAlignment.mainAxis().getMinScroll(); 1941 if (mScrollOffsetPrimary + da < minScroll) { 1942 da = minScroll - mScrollOffsetPrimary; 1943 } 1944 } 1945 } 1946 if (da == 0) { 1947 if (TRACE) TraceHelper.endSection(); 1948 return 0; 1949 } 1950 offsetChildrenPrimary(-da); 1951 mScrollOffsetPrimary += da; 1952 if (mInLayout) { 1953 if (TRACE) TraceHelper.endSection(); 1954 return da; 1955 } 1956 1957 int childCount = getChildCount(); 1958 boolean updated; 1959 1960 if (mReverseFlowPrimary ? da > 0 : da < 0) { 1961 prependVisibleItems(); 1962 } else { 1963 appendVisibleItems(); 1964 } 1965 updated = getChildCount() > childCount; 1966 childCount = getChildCount(); 1967 1968 if (TRACE) TraceHelper.beginSection("remove"); 1969 if (mReverseFlowPrimary ? da > 0 : da < 0) { 1970 removeInvisibleViewsAtEnd(); 1971 } else { 1972 removeInvisibleViewsAtFront(); 1973 } 1974 if (TRACE) TraceHelper.endSection(); 1975 updated |= getChildCount() < childCount; 1976 if (updated) { 1977 updateRowSecondarySizeRefresh(); 1978 } 1979 1980 mBaseGridView.invalidate(); 1981 if (TRACE) TraceHelper.endSection(); 1982 return da; 1983 } 1984 1985 // scroll in second direction will not add/prune views 1986 private int scrollDirectionSecondary(int dy) { 1987 if (dy == 0) { 1988 return 0; 1989 } 1990 offsetChildrenSecondary(-dy); 1991 mScrollOffsetSecondary += dy; 1992 mBaseGridView.invalidate(); 1993 return dy; 1994 } 1995 1996 private void updateScrollMax() { 1997 int highVisiblePos = (!mReverseFlowPrimary) ? mGrid.getLastVisibleIndex() 1998 : mGrid.getFirstVisibleIndex(); 1999 int highMaxPos = (!mReverseFlowPrimary) ? mState.getItemCount() - 1 : 0; 2000 if (highVisiblePos < 0) { 2001 return; 2002 } 2003 final boolean highAvailable = highVisiblePos == highMaxPos; 2004 final boolean maxUnknown = mWindowAlignment.mainAxis().isMaxUnknown(); 2005 if (!highAvailable && maxUnknown) { 2006 return; 2007 } 2008 int maxEdge = mGrid.findRowMax(true, sTwoInts) + mScrollOffsetPrimary; 2009 int rowIndex = sTwoInts[0]; 2010 int pos = sTwoInts[1]; 2011 int savedMaxEdge = mWindowAlignment.mainAxis().getMaxEdge(); 2012 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 2013 int maxScroll = getPrimarySystemScrollPosition(findViewByPosition(pos)); 2014 mWindowAlignment.mainAxis().setMaxEdge(savedMaxEdge); 2015 2016 if (highAvailable) { 2017 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 2018 mWindowAlignment.mainAxis().setMaxScroll(maxScroll); 2019 if (DEBUG) Log.v(getTag(), "updating scroll maxEdge to " + maxEdge + 2020 " scrollMax to " + maxScroll); 2021 } else { 2022 mWindowAlignment.mainAxis().invalidateScrollMax(); 2023 if (DEBUG) Log.v(getTag(), "Invalidate scrollMax since it should be " 2024 + "greater than " + maxScroll); 2025 } 2026 } 2027 2028 private void updateScrollMin() { 2029 int lowVisiblePos = (!mReverseFlowPrimary) ? mGrid.getFirstVisibleIndex() 2030 : mGrid.getLastVisibleIndex(); 2031 int lowMinPos = (!mReverseFlowPrimary) ? 0 : mState.getItemCount() - 1; 2032 if (lowVisiblePos < 0) { 2033 return; 2034 } 2035 final boolean lowAvailable = lowVisiblePos == lowMinPos; 2036 final boolean minUnknown = mWindowAlignment.mainAxis().isMinUnknown(); 2037 if (!lowAvailable && minUnknown) { 2038 return; 2039 } 2040 int minEdge = mGrid.findRowMin(false, sTwoInts) + mScrollOffsetPrimary; 2041 int rowIndex = sTwoInts[0]; 2042 int pos = sTwoInts[1]; 2043 int savedMinEdge = mWindowAlignment.mainAxis().getMinEdge(); 2044 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2045 int minScroll = getPrimarySystemScrollPosition(findViewByPosition(pos)); 2046 mWindowAlignment.mainAxis().setMinEdge(savedMinEdge); 2047 2048 if (lowAvailable) { 2049 mWindowAlignment.mainAxis().setMinEdge(minEdge); 2050 mWindowAlignment.mainAxis().setMinScroll(minScroll); 2051 if (DEBUG) Log.v(getTag(), "updating scroll minEdge to " + minEdge + 2052 " scrollMin to " + minScroll); 2053 } else { 2054 mWindowAlignment.mainAxis().invalidateScrollMin(); 2055 if (DEBUG) Log.v(getTag(), "Invalidate scrollMin, since it should be " 2056 + "less than " + minScroll); 2057 } 2058 } 2059 2060 private void updateScrollSecondAxis() { 2061 mWindowAlignment.secondAxis().setMinEdge(0); 2062 mWindowAlignment.secondAxis().setMaxEdge(getSizeSecondary()); 2063 } 2064 2065 private void initScrollController() { 2066 mWindowAlignment.reset(); 2067 mWindowAlignment.horizontal.setSize(getWidth()); 2068 mWindowAlignment.vertical.setSize(getHeight()); 2069 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2070 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2071 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2072 mScrollOffsetPrimary = -mWindowAlignment.mainAxis().getPaddingLow(); 2073 mScrollOffsetSecondary = -mWindowAlignment.secondAxis().getPaddingLow(); 2074 2075 if (DEBUG) { 2076 Log.v(getTag(), "initScrollController mSizePrimary " + mSizePrimary 2077 + " mWindowAlignment " + mWindowAlignment 2078 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2079 } 2080 } 2081 2082 private void updateScrollController() { 2083 // mScrollOffsetPrimary and mScrollOffsetSecondary includes the padding. 2084 // e.g. when topPadding is 16 for horizontal grid view, the initial 2085 // mScrollOffsetSecondary is -16. fastRelayout() put views based on offsets(not padding), 2086 // when padding changes to 20, we also need update mScrollOffsetSecondary to -20 before 2087 // fastRelayout() is performed 2088 int paddingPrimaryDiff, paddingSecondaryDiff; 2089 if (mOrientation == HORIZONTAL) { 2090 paddingPrimaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2091 paddingSecondaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2092 } else { 2093 paddingPrimaryDiff = getPaddingTop() - mWindowAlignment.vertical.getPaddingLow(); 2094 paddingSecondaryDiff = getPaddingLeft() - mWindowAlignment.horizontal.getPaddingLow(); 2095 } 2096 mScrollOffsetPrimary -= paddingPrimaryDiff; 2097 mScrollOffsetSecondary -= paddingSecondaryDiff; 2098 2099 mWindowAlignment.horizontal.setSize(getWidth()); 2100 mWindowAlignment.vertical.setSize(getHeight()); 2101 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 2102 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 2103 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 2104 2105 if (DEBUG) { 2106 Log.v(getTag(), "updateScrollController mSizePrimary " + mSizePrimary 2107 + " mWindowAlignment " + mWindowAlignment 2108 + " mScrollOffsetPrimary " + mScrollOffsetPrimary); 2109 } 2110 } 2111 2112 public void setSelection(RecyclerView parent, int position, 2113 int primaryScrollExtra) { 2114 setSelection(parent, position, 0, false, primaryScrollExtra); 2115 } 2116 2117 public void setSelectionSmooth(RecyclerView parent, int position) { 2118 setSelection(parent, position, 0, true, 0); 2119 } 2120 2121 public void setSelectionWithSub(RecyclerView parent, int position, int subposition, 2122 int primaryScrollExtra) { 2123 setSelection(parent, position, subposition, false, primaryScrollExtra); 2124 } 2125 2126 public void setSelectionSmoothWithSub(RecyclerView parent, int position, int subposition) { 2127 setSelection(parent, position, subposition, true, 0); 2128 } 2129 2130 public int getSelection() { 2131 return mFocusPosition; 2132 } 2133 2134 public int getSubSelection() { 2135 return mSubFocusPosition; 2136 } 2137 2138 public void setSelection(RecyclerView parent, int position, int subposition, boolean smooth, 2139 int primaryScrollExtra) { 2140 if (mFocusPosition != position && position != NO_POSITION 2141 || subposition != mSubFocusPosition || primaryScrollExtra != mPrimaryScrollExtra) { 2142 scrollToSelection(parent, position, subposition, smooth, primaryScrollExtra); 2143 } 2144 } 2145 2146 private void scrollToSelection(RecyclerView parent, int position, int subposition, 2147 boolean smooth, int primaryScrollExtra) { 2148 if (TRACE) TraceHelper.beginSection("scrollToSelection"); 2149 mPrimaryScrollExtra = primaryScrollExtra; 2150 View view = findViewByPosition(position); 2151 if (view != null) { 2152 mInSelection = true; 2153 scrollToView(view, smooth); 2154 mInSelection = false; 2155 } else { 2156 mFocusPosition = position; 2157 mSubFocusPosition = subposition; 2158 mFocusPositionOffset = Integer.MIN_VALUE; 2159 if (!mLayoutEnabled) { 2160 return; 2161 } 2162 if (smooth) { 2163 if (!hasDoneFirstLayout()) { 2164 Log.w(getTag(), "setSelectionSmooth should " + 2165 "not be called before first layout pass"); 2166 return; 2167 } 2168 startPositionSmoothScroller(position); 2169 } else { 2170 mForceFullLayout = true; 2171 parent.requestLayout(); 2172 } 2173 } 2174 if (TRACE) TraceHelper.endSection(); 2175 } 2176 2177 void startPositionSmoothScroller(int position) { 2178 LinearSmoothScroller linearSmoothScroller = new GridLinearSmoothScroller() { 2179 @Override 2180 public PointF computeScrollVectorForPosition(int targetPosition) { 2181 if (getChildCount() == 0) { 2182 return null; 2183 } 2184 final int firstChildPos = getPosition(getChildAt(0)); 2185 // TODO We should be able to deduce direction from bounds of current and target 2186 // focus, rather than making assumptions about positions and directionality 2187 final boolean isStart = mReverseFlowPrimary ? targetPosition > firstChildPos 2188 : targetPosition < firstChildPos; 2189 final int direction = isStart ? -1 : 1; 2190 if (mOrientation == HORIZONTAL) { 2191 return new PointF(direction, 0); 2192 } else { 2193 return new PointF(0, direction); 2194 } 2195 } 2196 2197 }; 2198 linearSmoothScroller.setTargetPosition(position); 2199 startSmoothScroll(linearSmoothScroller); 2200 } 2201 2202 private void processPendingMovement(boolean forward) { 2203 if (forward ? hasCreatedLastItem() : hasCreatedFirstItem()) { 2204 return; 2205 } 2206 if (mPendingMoveSmoothScroller == null) { 2207 // Stop existing scroller and create a new PendingMoveSmoothScroller. 2208 mBaseGridView.stopScroll(); 2209 PendingMoveSmoothScroller linearSmoothScroller = new PendingMoveSmoothScroller( 2210 forward ? 1 : -1, mNumRows > 1); 2211 mFocusPositionOffset = 0; 2212 startSmoothScroll(linearSmoothScroller); 2213 if (linearSmoothScroller.isRunning()) { 2214 mPendingMoveSmoothScroller = linearSmoothScroller; 2215 } 2216 } else { 2217 if (forward) { 2218 mPendingMoveSmoothScroller.increasePendingMoves(); 2219 } else { 2220 mPendingMoveSmoothScroller.decreasePendingMoves(); 2221 } 2222 } 2223 } 2224 2225 @Override 2226 public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) { 2227 if (DEBUG) Log.v(getTag(), "onItemsAdded positionStart " 2228 + positionStart + " itemCount " + itemCount); 2229 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2230 int pos = mFocusPosition + mFocusPositionOffset; 2231 if (positionStart <= pos) { 2232 mFocusPositionOffset += itemCount; 2233 } 2234 } 2235 mChildrenStates.clear(); 2236 } 2237 2238 @Override 2239 public void onItemsChanged(RecyclerView recyclerView) { 2240 if (DEBUG) Log.v(getTag(), "onItemsChanged"); 2241 mFocusPositionOffset = 0; 2242 mChildrenStates.clear(); 2243 } 2244 2245 @Override 2246 public void onItemsRemoved(RecyclerView recyclerView, int positionStart, int itemCount) { 2247 if (DEBUG) Log.v(getTag(), "onItemsRemoved positionStart " 2248 + positionStart + " itemCount " + itemCount); 2249 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2250 int pos = mFocusPosition + mFocusPositionOffset; 2251 if (positionStart <= pos) { 2252 if (positionStart + itemCount > pos) { 2253 // stop updating offset after the focus item was removed 2254 mFocusPositionOffset = Integer.MIN_VALUE; 2255 } else { 2256 mFocusPositionOffset -= itemCount; 2257 } 2258 } 2259 } 2260 mChildrenStates.clear(); 2261 } 2262 2263 @Override 2264 public void onItemsMoved(RecyclerView recyclerView, int fromPosition, int toPosition, 2265 int itemCount) { 2266 if (DEBUG) Log.v(getTag(), "onItemsMoved fromPosition " 2267 + fromPosition + " toPosition " + toPosition); 2268 if (mFocusPosition != NO_POSITION && mFocusPositionOffset != Integer.MIN_VALUE) { 2269 int pos = mFocusPosition + mFocusPositionOffset; 2270 if (fromPosition <= pos && pos < fromPosition + itemCount) { 2271 // moved items include focused position 2272 mFocusPositionOffset += toPosition - fromPosition; 2273 } else if (fromPosition < pos && toPosition > pos - itemCount) { 2274 // move items before focus position to after focused position 2275 mFocusPositionOffset -= itemCount; 2276 } else if (fromPosition > pos && toPosition < pos) { 2277 // move items after focus position to before focused position 2278 mFocusPositionOffset += itemCount; 2279 } 2280 } 2281 mChildrenStates.clear(); 2282 } 2283 2284 @Override 2285 public void onItemsUpdated(RecyclerView recyclerView, int positionStart, int itemCount) { 2286 if (DEBUG) Log.v(getTag(), "onItemsUpdated positionStart " 2287 + positionStart + " itemCount " + itemCount); 2288 for (int i = positionStart, end = positionStart + itemCount; i < end; i++) { 2289 mChildrenStates.remove(i); 2290 } 2291 } 2292 2293 @Override 2294 public boolean onRequestChildFocus(RecyclerView parent, View child, View focused) { 2295 if (mFocusSearchDisabled) { 2296 return true; 2297 } 2298 if (getPositionByView(child) == NO_POSITION) { 2299 // This shouldn't happen, but in case it does be sure not to attempt a 2300 // scroll to a view whose item has been removed. 2301 return true; 2302 } 2303 if (!mInLayout && !mInSelection && !mInScroll) { 2304 scrollToView(child, focused, true); 2305 } 2306 return true; 2307 } 2308 2309 @Override 2310 public boolean requestChildRectangleOnScreen(RecyclerView parent, View view, Rect rect, 2311 boolean immediate) { 2312 if (DEBUG) Log.v(getTag(), "requestChildRectangleOnScreen " + view + " " + rect); 2313 return false; 2314 } 2315 2316 int getScrollOffsetX() { 2317 return mOrientation == HORIZONTAL ? mScrollOffsetPrimary : mScrollOffsetSecondary; 2318 } 2319 2320 int getScrollOffsetY() { 2321 return mOrientation == HORIZONTAL ? mScrollOffsetSecondary : mScrollOffsetPrimary; 2322 } 2323 2324 public void getViewSelectedOffsets(View view, int[] offsets) { 2325 if (mOrientation == HORIZONTAL) { 2326 offsets[0] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2327 offsets[1] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2328 } else { 2329 offsets[1] = getPrimarySystemScrollPosition(view) - mScrollOffsetPrimary; 2330 offsets[0] = getSecondarySystemScrollPosition(view) - mScrollOffsetSecondary; 2331 } 2332 } 2333 2334 private int getPrimarySystemScrollPosition(View view) { 2335 final int viewCenterPrimary = mScrollOffsetPrimary + getViewCenter(view); 2336 final int viewMin = getViewMin(view); 2337 final int viewMax = getViewMax(view); 2338 // TODO: change to use State object in onRequestChildFocus() 2339 boolean isMin, isMax; 2340 if (!mReverseFlowPrimary) { 2341 isMin = mGrid.getFirstVisibleIndex() == 0; 2342 isMax = mGrid.getLastVisibleIndex() == (mState == null ? 2343 getItemCount() : mState.getItemCount()) - 1; 2344 } else { 2345 isMax = mGrid.getFirstVisibleIndex() == 0; 2346 isMin = mGrid.getLastVisibleIndex() == (mState == null ? 2347 getItemCount() : mState.getItemCount()) - 1; 2348 } 2349 for (int i = getChildCount() - 1; (isMin || isMax) && i >= 0; i--) { 2350 View v = getChildAt(i); 2351 if (v == view || v == null) { 2352 continue; 2353 } 2354 if (isMin && getViewMin(v) < viewMin) { 2355 isMin = false; 2356 } 2357 if (isMax && getViewMax(v) > viewMax) { 2358 isMax = false; 2359 } 2360 } 2361 return mWindowAlignment.mainAxis().getSystemScrollPos(viewCenterPrimary, isMin, isMax); 2362 } 2363 2364 /** 2365 * Get adjusted primary position for a given childView (if there is multiple ItemAlignment defined 2366 * on the view). 2367 */ 2368 private int getAdjustedPrimaryScrollPosition(int scrollPrimary, View view, View childView) { 2369 int subindex = getSubPositionByView(view, childView); 2370 if (subindex != 0) { 2371 final LayoutParams lp = (LayoutParams) view.getLayoutParams(); 2372 scrollPrimary += lp.getAlignMultiple()[subindex] - lp.getAlignMultiple()[0]; 2373 } 2374 return scrollPrimary; 2375 } 2376 2377 private int getSecondarySystemScrollPosition(View view) { 2378 int viewCenterSecondary = mScrollOffsetSecondary + getViewCenterSecondary(view); 2379 int pos = getPositionByView(view); 2380 Grid.Location location = mGrid.getLocation(pos); 2381 final int row = location.row; 2382 final boolean isMin, isMax; 2383 if (!mReverseFlowSecondary) { 2384 isMin = row == 0; 2385 isMax = row == mGrid.getNumRows() - 1; 2386 } else { 2387 isMax = row == 0; 2388 isMin = row == mGrid.getNumRows() - 1; 2389 } 2390 return mWindowAlignment.secondAxis().getSystemScrollPos(viewCenterSecondary, isMin, isMax); 2391 } 2392 2393 /** 2394 * Scroll to a given child view and change mFocusPosition. 2395 */ 2396 private void scrollToView(View view, boolean smooth) { 2397 scrollToView(view, view == null ? null : view.findFocus(), smooth); 2398 } 2399 2400 /** 2401 * Scroll to a given child view and change mFocusPosition. 2402 */ 2403 private void scrollToView(View view, View childView, boolean smooth) { 2404 int newFocusPosition = getPositionByView(view); 2405 int newSubFocusPosition = getSubPositionByView(view, childView); 2406 if (newFocusPosition != mFocusPosition || newSubFocusPosition != mSubFocusPosition) { 2407 mFocusPosition = newFocusPosition; 2408 mSubFocusPosition = newSubFocusPosition; 2409 mFocusPositionOffset = 0; 2410 if (!mInLayout) { 2411 dispatchChildSelected(); 2412 } 2413 if (mBaseGridView.isChildrenDrawingOrderEnabledInternal()) { 2414 mBaseGridView.invalidate(); 2415 } 2416 } 2417 if (view == null) { 2418 return; 2419 } 2420 if (!view.hasFocus() && mBaseGridView.hasFocus()) { 2421 // transfer focus to the child if it does not have focus yet (e.g. triggered 2422 // by setSelection()) 2423 view.requestFocus(); 2424 } 2425 if (!mScrollEnabled && smooth) { 2426 return; 2427 } 2428 if (getScrollPosition(view, childView, sTwoInts)) { 2429 scrollGrid(sTwoInts[0], sTwoInts[1], smooth); 2430 } 2431 } 2432 2433 private boolean getScrollPosition(View view, View childView, int[] deltas) { 2434 switch (mFocusScrollStrategy) { 2435 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2436 default: 2437 return getAlignedPosition(view, childView, deltas); 2438 case BaseGridView.FOCUS_SCROLL_ITEM: 2439 case BaseGridView.FOCUS_SCROLL_PAGE: 2440 return getNoneAlignedPosition(view, deltas); 2441 } 2442 } 2443 2444 private boolean getNoneAlignedPosition(View view, int[] deltas) { 2445 int pos = getPositionByView(view); 2446 int viewMin = getViewMin(view); 2447 int viewMax = getViewMax(view); 2448 // we either align "firstView" to left/top padding edge 2449 // or align "lastView" to right/bottom padding edge 2450 View firstView = null; 2451 View lastView = null; 2452 int paddingLow = mWindowAlignment.mainAxis().getPaddingLow(); 2453 int clientSize = mWindowAlignment.mainAxis().getClientSize(); 2454 final int row = mGrid.getRowIndex(pos); 2455 if (viewMin < paddingLow) { 2456 // view enters low padding area: 2457 firstView = view; 2458 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2459 // scroll one "page" left/top, 2460 // align first visible item of the "page" at the low padding edge. 2461 while (prependOneColumnVisibleItems()) { 2462 CircularIntArray positions = 2463 mGrid.getItemPositionsInRows(mGrid.getFirstVisibleIndex(), pos)[row]; 2464 firstView = findViewByPosition(positions.get(0)); 2465 if (viewMax - getViewMin(firstView) > clientSize) { 2466 if (positions.size() > 2) { 2467 firstView = findViewByPosition(positions.get(2)); 2468 } 2469 break; 2470 } 2471 } 2472 } 2473 } else if (viewMax > clientSize + paddingLow) { 2474 // view enters high padding area: 2475 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 2476 // scroll whole one page right/bottom, align view at the low padding edge. 2477 firstView = view; 2478 do { 2479 CircularIntArray positions = 2480 mGrid.getItemPositionsInRows(pos, mGrid.getLastVisibleIndex())[row]; 2481 lastView = findViewByPosition(positions.get(positions.size() - 1)); 2482 if (getViewMax(lastView) - viewMin > clientSize) { 2483 lastView = null; 2484 break; 2485 } 2486 } while (appendOneColumnVisibleItems()); 2487 if (lastView != null) { 2488 // however if we reached end, we should align last view. 2489 firstView = null; 2490 } 2491 } else { 2492 lastView = view; 2493 } 2494 } 2495 int scrollPrimary = 0; 2496 int scrollSecondary = 0; 2497 if (firstView != null) { 2498 scrollPrimary = getViewMin(firstView) - paddingLow; 2499 } else if (lastView != null) { 2500 scrollPrimary = getViewMax(lastView) - (paddingLow + clientSize); 2501 } 2502 View secondaryAlignedView; 2503 if (firstView != null) { 2504 secondaryAlignedView = firstView; 2505 } else if (lastView != null) { 2506 secondaryAlignedView = lastView; 2507 } else { 2508 secondaryAlignedView = view; 2509 } 2510 scrollSecondary = getSecondarySystemScrollPosition(secondaryAlignedView); 2511 scrollSecondary -= mScrollOffsetSecondary; 2512 if (scrollPrimary != 0 || scrollSecondary != 0) { 2513 deltas[0] = scrollPrimary; 2514 deltas[1] = scrollSecondary; 2515 return true; 2516 } 2517 return false; 2518 } 2519 2520 private boolean getAlignedPosition(View view, View childView, int[] deltas) { 2521 int scrollPrimary = getPrimarySystemScrollPosition(view); 2522 if (childView != null) { 2523 scrollPrimary = getAdjustedPrimaryScrollPosition(scrollPrimary, view, childView); 2524 } 2525 int scrollSecondary = getSecondarySystemScrollPosition(view); 2526 if (DEBUG) { 2527 Log.v(getTag(), "getAlignedPosition " + scrollPrimary + " " + scrollSecondary 2528 + " " + mPrimaryScrollExtra + " " + mWindowAlignment); 2529 Log.v(getTag(), "getAlignedPosition " + mScrollOffsetPrimary + " " + mScrollOffsetSecondary); 2530 } 2531 scrollPrimary -= mScrollOffsetPrimary; 2532 scrollSecondary -= mScrollOffsetSecondary; 2533 scrollPrimary += mPrimaryScrollExtra; 2534 if (scrollPrimary != 0 || scrollSecondary != 0) { 2535 deltas[0] = scrollPrimary; 2536 deltas[1] = scrollSecondary; 2537 return true; 2538 } 2539 return false; 2540 } 2541 2542 private void scrollGrid(int scrollPrimary, int scrollSecondary, boolean smooth) { 2543 if (mInLayout) { 2544 scrollDirectionPrimary(scrollPrimary); 2545 scrollDirectionSecondary(scrollSecondary); 2546 } else { 2547 int scrollX; 2548 int scrollY; 2549 if (mOrientation == HORIZONTAL) { 2550 scrollX = scrollPrimary; 2551 scrollY = scrollSecondary; 2552 } else { 2553 scrollX = scrollSecondary; 2554 scrollY = scrollPrimary; 2555 } 2556 if (smooth) { 2557 mBaseGridView.smoothScrollBy(scrollX, scrollY); 2558 } else { 2559 mBaseGridView.scrollBy(scrollX, scrollY); 2560 } 2561 } 2562 } 2563 2564 public void setPruneChild(boolean pruneChild) { 2565 if (mPruneChild != pruneChild) { 2566 mPruneChild = pruneChild; 2567 if (mPruneChild) { 2568 requestLayout(); 2569 } 2570 } 2571 } 2572 2573 public boolean getPruneChild() { 2574 return mPruneChild; 2575 } 2576 2577 public void setScrollEnabled(boolean scrollEnabled) { 2578 if (mScrollEnabled != scrollEnabled) { 2579 mScrollEnabled = scrollEnabled; 2580 if (mScrollEnabled && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED 2581 && mFocusPosition != NO_POSITION) { 2582 scrollToSelection(mBaseGridView, mFocusPosition, mSubFocusPosition, 2583 true, mPrimaryScrollExtra); 2584 } 2585 } 2586 } 2587 2588 public boolean isScrollEnabled() { 2589 return mScrollEnabled; 2590 } 2591 2592 private int findImmediateChildIndex(View view) { 2593 while (view != null && view != mBaseGridView) { 2594 int index = mBaseGridView.indexOfChild(view); 2595 if (index >= 0) { 2596 return index; 2597 } 2598 view = (View) view.getParent(); 2599 } 2600 return NO_POSITION; 2601 } 2602 2603 void setFocusSearchDisabled(boolean disabled) { 2604 mFocusSearchDisabled = disabled; 2605 } 2606 2607 boolean isFocusSearchDisabled() { 2608 return mFocusSearchDisabled; 2609 } 2610 2611 @Override 2612 public View onInterceptFocusSearch(View focused, int direction) { 2613 if (mFocusSearchDisabled) { 2614 return focused; 2615 } 2616 return null; 2617 } 2618 2619 boolean hasPreviousViewInSameRow(int pos) { 2620 if (mGrid == null || pos == NO_POSITION || mGrid.getFirstVisibleIndex() < 0) { 2621 return false; 2622 } 2623 if (mGrid.getFirstVisibleIndex() > 0) { 2624 return true; 2625 } 2626 final int focusedRow = mGrid.getLocation(pos).row; 2627 for (int i = getChildCount() - 1; i >= 0; i--) { 2628 int position = getPositionByIndex(i); 2629 Grid.Location loc = mGrid.getLocation(position); 2630 if (loc != null && loc.row == focusedRow) { 2631 if (position < pos) { 2632 return true; 2633 } 2634 } 2635 } 2636 return false; 2637 } 2638 2639 @Override 2640 public boolean onAddFocusables(RecyclerView recyclerView, 2641 ArrayList<View> views, int direction, int focusableMode) { 2642 if (mFocusSearchDisabled) { 2643 return true; 2644 } 2645 // If this viewgroup or one of its children currently has focus then we 2646 // consider our children for focus searching in main direction on the same row. 2647 // If this viewgroup has no focus and using focus align, we want the system 2648 // to ignore our children and pass focus to the viewgroup, which will pass 2649 // focus on to its children appropriately. 2650 // If this viewgroup has no focus and not using focus align, we want to 2651 // consider the child that does not overlap with padding area. 2652 if (recyclerView.hasFocus()) { 2653 final int movement = getMovement(direction); 2654 if (movement != PREV_ITEM && movement != NEXT_ITEM) { 2655 // Move on secondary direction uses default addFocusables(). 2656 return false; 2657 } 2658 if (mPendingMoveSmoothScroller != null) { 2659 // don't find next focusable if has pending movement. 2660 return true; 2661 } 2662 final View focused = recyclerView.findFocus(); 2663 final int focusedPos = getPositionByIndex(findImmediateChildIndex(focused)); 2664 // Add focusables of focused item. 2665 if (focusedPos != NO_POSITION) { 2666 findViewByPosition(focusedPos).addFocusables(views, direction, focusableMode); 2667 } 2668 final int focusedRow = mGrid != null && focusedPos != NO_POSITION ? 2669 mGrid.getLocation(focusedPos).row : NO_POSITION; 2670 // Add focusables of next neighbor of same row on the focus search direction. 2671 if (mGrid != null) { 2672 final int focusableCount = views.size(); 2673 for (int i = 0, count = getChildCount(); i < count; i++) { 2674 int index = movement == NEXT_ITEM ? i : count - 1 - i; 2675 final View child = getChildAt(index); 2676 if (child.getVisibility() != View.VISIBLE || !child.hasFocusable()) { 2677 continue; 2678 } 2679 int position = getPositionByIndex(index); 2680 Grid.Location loc = mGrid.getLocation(position); 2681 if (focusedRow == NO_POSITION || (loc != null && loc.row == focusedRow)) { 2682 if (focusedPos == NO_POSITION || 2683 (movement == NEXT_ITEM && position > focusedPos) 2684 || (movement == PREV_ITEM && position < focusedPos)) { 2685 child.addFocusables(views, direction, focusableMode); 2686 if (views.size() > focusableCount) { 2687 break; 2688 } 2689 } 2690 } 2691 } 2692 } 2693 } else { 2694 if (mFocusScrollStrategy != BaseGridView.FOCUS_SCROLL_ALIGNED) { 2695 // adding views not overlapping padding area to avoid scrolling in gaining focus 2696 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2697 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2698 int focusableCount = views.size(); 2699 for (int i = 0, count = getChildCount(); i < count; i++) { 2700 View child = getChildAt(i); 2701 if (child.getVisibility() == View.VISIBLE) { 2702 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2703 child.addFocusables(views, direction, focusableMode); 2704 } 2705 } 2706 } 2707 // if we cannot find any, then just add all children. 2708 if (views.size() == focusableCount) { 2709 for (int i = 0, count = getChildCount(); i < count; i++) { 2710 View child = getChildAt(i); 2711 if (child.getVisibility() == View.VISIBLE) { 2712 child.addFocusables(views, direction, focusableMode); 2713 } 2714 } 2715 if (views.size() != focusableCount) { 2716 return true; 2717 } 2718 } else { 2719 return true; 2720 } 2721 // if still cannot find any, fall through and add itself 2722 } 2723 if (recyclerView.isFocusable()) { 2724 views.add(recyclerView); 2725 } 2726 } 2727 return true; 2728 } 2729 2730 private boolean hasCreatedLastItem() { 2731 int count = mState.getItemCount(); 2732 return count == 0 || findViewByPosition(count - 1) != null; 2733 } 2734 2735 private boolean hasCreatedFirstItem() { 2736 int count = mState.getItemCount(); 2737 return count == 0 || findViewByPosition(0) != null; 2738 } 2739 2740 boolean canScrollTo(View view) { 2741 return view.getVisibility() == View.VISIBLE && (!hasFocus() || view.hasFocusable()); 2742 } 2743 2744 @Override 2745 public View onFocusSearchFailed(View focused, int direction, Recycler recycler, 2746 RecyclerView.State state) { 2747 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed direction " + direction); 2748 2749 View view = null; 2750 int movement = getMovement(direction); 2751 final boolean isScroll = mBaseGridView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE; 2752 saveContext(recycler, state); 2753 if (movement == NEXT_ITEM) { 2754 if (isScroll || !mFocusOutEnd) { 2755 view = focused; 2756 } 2757 if (mScrollEnabled && !hasCreatedLastItem()) { 2758 processPendingMovement(true); 2759 view = focused; 2760 } 2761 } else if (movement == PREV_ITEM) { 2762 if (isScroll || !mFocusOutFront) { 2763 view = focused; 2764 } 2765 if (mScrollEnabled && !hasCreatedFirstItem()) { 2766 processPendingMovement(false); 2767 view = focused; 2768 } 2769 } 2770 leaveContext(); 2771 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed returning view " + view); 2772 return view; 2773 } 2774 2775 boolean gridOnRequestFocusInDescendants(RecyclerView recyclerView, int direction, 2776 Rect previouslyFocusedRect) { 2777 switch (mFocusScrollStrategy) { 2778 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2779 default: 2780 return gridOnRequestFocusInDescendantsAligned(recyclerView, 2781 direction, previouslyFocusedRect); 2782 case BaseGridView.FOCUS_SCROLL_PAGE: 2783 case BaseGridView.FOCUS_SCROLL_ITEM: 2784 return gridOnRequestFocusInDescendantsUnaligned(recyclerView, 2785 direction, previouslyFocusedRect); 2786 } 2787 } 2788 2789 private boolean gridOnRequestFocusInDescendantsAligned(RecyclerView recyclerView, 2790 int direction, Rect previouslyFocusedRect) { 2791 View view = findViewByPosition(mFocusPosition); 2792 if (view != null) { 2793 boolean result = view.requestFocus(direction, previouslyFocusedRect); 2794 if (!result && DEBUG) { 2795 Log.w(getTag(), "failed to request focus on " + view); 2796 } 2797 return result; 2798 } 2799 return false; 2800 } 2801 2802 private boolean gridOnRequestFocusInDescendantsUnaligned(RecyclerView recyclerView, 2803 int direction, Rect previouslyFocusedRect) { 2804 // focus to view not overlapping padding area to avoid scrolling in gaining focus 2805 int index; 2806 int increment; 2807 int end; 2808 int count = getChildCount(); 2809 if ((direction & View.FOCUS_FORWARD) != 0) { 2810 index = 0; 2811 increment = 1; 2812 end = count; 2813 } else { 2814 index = count - 1; 2815 increment = -1; 2816 end = -1; 2817 } 2818 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2819 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2820 for (int i = index; i != end; i += increment) { 2821 View child = getChildAt(i); 2822 if (child.getVisibility() == View.VISIBLE) { 2823 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2824 if (child.requestFocus(direction, previouslyFocusedRect)) { 2825 return true; 2826 } 2827 } 2828 } 2829 } 2830 return false; 2831 } 2832 2833 private final static int PREV_ITEM = 0; 2834 private final static int NEXT_ITEM = 1; 2835 private final static int PREV_ROW = 2; 2836 private final static int NEXT_ROW = 3; 2837 2838 private int getMovement(int direction) { 2839 int movement = View.FOCUS_LEFT; 2840 2841 if (mOrientation == HORIZONTAL) { 2842 switch(direction) { 2843 case View.FOCUS_LEFT: 2844 movement = (!mReverseFlowPrimary) ? PREV_ITEM : NEXT_ITEM; 2845 break; 2846 case View.FOCUS_RIGHT: 2847 movement = (!mReverseFlowPrimary) ? NEXT_ITEM : PREV_ITEM; 2848 break; 2849 case View.FOCUS_UP: 2850 movement = PREV_ROW; 2851 break; 2852 case View.FOCUS_DOWN: 2853 movement = NEXT_ROW; 2854 break; 2855 } 2856 } else if (mOrientation == VERTICAL) { 2857 switch(direction) { 2858 case View.FOCUS_LEFT: 2859 movement = (!mReverseFlowPrimary) ? PREV_ROW : NEXT_ROW; 2860 break; 2861 case View.FOCUS_RIGHT: 2862 movement = (!mReverseFlowPrimary) ? NEXT_ROW : PREV_ROW; 2863 break; 2864 case View.FOCUS_UP: 2865 movement = PREV_ITEM; 2866 break; 2867 case View.FOCUS_DOWN: 2868 movement = NEXT_ITEM; 2869 break; 2870 } 2871 } 2872 2873 return movement; 2874 } 2875 2876 int getChildDrawingOrder(RecyclerView recyclerView, int childCount, int i) { 2877 View view = findViewByPosition(mFocusPosition); 2878 if (view == null) { 2879 return i; 2880 } 2881 int focusIndex = recyclerView.indexOfChild(view); 2882 // supposely 0 1 2 3 4 5 6 7 8 9, 4 is the center item 2883 // drawing order is 0 1 2 3 9 8 7 6 5 4 2884 if (i < focusIndex) { 2885 return i; 2886 } else if (i < childCount - 1) { 2887 return focusIndex + childCount - 1 - i; 2888 } else { 2889 return focusIndex; 2890 } 2891 } 2892 2893 @Override 2894 public void onAdapterChanged(RecyclerView.Adapter oldAdapter, 2895 RecyclerView.Adapter newAdapter) { 2896 if (DEBUG) Log.v(getTag(), "onAdapterChanged to " + newAdapter); 2897 if (oldAdapter != null) { 2898 discardLayoutInfo(); 2899 mFocusPosition = NO_POSITION; 2900 mFocusPositionOffset = 0; 2901 mChildrenStates.clear(); 2902 } 2903 if (newAdapter instanceof FacetProviderAdapter) { 2904 mFacetProviderAdapter = (FacetProviderAdapter) newAdapter; 2905 } else { 2906 mFacetProviderAdapter = null; 2907 } 2908 super.onAdapterChanged(oldAdapter, newAdapter); 2909 } 2910 2911 private void discardLayoutInfo() { 2912 mGrid = null; 2913 mRowSizeSecondary = null; 2914 mRowSecondarySizeRefresh = false; 2915 } 2916 2917 public void setLayoutEnabled(boolean layoutEnabled) { 2918 if (mLayoutEnabled != layoutEnabled) { 2919 mLayoutEnabled = layoutEnabled; 2920 requestLayout(); 2921 } 2922 } 2923 2924 void setChildrenVisibility(int visiblity) { 2925 mChildVisibility = visiblity; 2926 if (mChildVisibility != -1) { 2927 int count = getChildCount(); 2928 for (int i= 0; i < count; i++) { 2929 getChildAt(i).setVisibility(mChildVisibility); 2930 } 2931 } 2932 } 2933 2934 final static class SavedState implements Parcelable { 2935 2936 int index; // index inside adapter of the current view 2937 Bundle childStates = Bundle.EMPTY; 2938 2939 @Override 2940 public void writeToParcel(Parcel out, int flags) { 2941 out.writeInt(index); 2942 out.writeBundle(childStates); 2943 } 2944 2945 @SuppressWarnings("hiding") 2946 public static final Parcelable.Creator<SavedState> CREATOR = 2947 new Parcelable.Creator<SavedState>() { 2948 @Override 2949 public SavedState createFromParcel(Parcel in) { 2950 return new SavedState(in); 2951 } 2952 2953 @Override 2954 public SavedState[] newArray(int size) { 2955 return new SavedState[size]; 2956 } 2957 }; 2958 2959 @Override 2960 public int describeContents() { 2961 return 0; 2962 } 2963 2964 SavedState(Parcel in) { 2965 index = in.readInt(); 2966 childStates = in.readBundle(GridLayoutManager.class.getClassLoader()); 2967 } 2968 2969 SavedState() { 2970 } 2971 } 2972 2973 @Override 2974 public Parcelable onSaveInstanceState() { 2975 if (DEBUG) Log.v(getTag(), "onSaveInstanceState getSelection() " + getSelection()); 2976 SavedState ss = new SavedState(); 2977 // save selected index 2978 ss.index = getSelection(); 2979 // save offscreen child (state when they are recycled) 2980 Bundle bundle = mChildrenStates.saveAsBundle(); 2981 // save views currently is on screen (TODO save cached views) 2982 for (int i = 0, count = getChildCount(); i < count; i++) { 2983 View view = getChildAt(i); 2984 int position = getPositionByView(view); 2985 if (position != NO_POSITION) { 2986 bundle = mChildrenStates.saveOnScreenView(bundle, view, position); 2987 } 2988 } 2989 ss.childStates = bundle; 2990 return ss; 2991 } 2992 2993 void onChildRecycled(RecyclerView.ViewHolder holder) { 2994 final int position = holder.getAdapterPosition(); 2995 if (position != NO_POSITION) { 2996 mChildrenStates.saveOffscreenView(holder.itemView, position); 2997 } 2998 } 2999 3000 @Override 3001 public void onRestoreInstanceState(Parcelable state) { 3002 if (!(state instanceof SavedState)) { 3003 return; 3004 } 3005 SavedState loadingState = (SavedState)state; 3006 mFocusPosition = loadingState.index; 3007 mFocusPositionOffset = 0; 3008 mChildrenStates.loadFromBundle(loadingState.childStates); 3009 mForceFullLayout = true; 3010 requestLayout(); 3011 if (DEBUG) Log.v(getTag(), "onRestoreInstanceState mFocusPosition " + mFocusPosition); 3012 } 3013} 3014