GridLayoutManager.java revision 57070ccd71477252474e3c4d35edddbc859c6179
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.animation.TimeAnimator; 17import android.content.Context; 18import android.graphics.Rect; 19import android.support.v7.widget.RecyclerView; 20import android.support.v7.widget.RecyclerView.Adapter; 21import android.support.v7.widget.RecyclerView.Recycler; 22import android.support.v7.widget.RecyclerView.State; 23 24import static android.support.v7.widget.RecyclerView.NO_ID; 25import static android.support.v7.widget.RecyclerView.NO_POSITION; 26import static android.support.v7.widget.RecyclerView.HORIZONTAL; 27import static android.support.v7.widget.RecyclerView.VERTICAL; 28 29import android.util.AttributeSet; 30import android.util.Log; 31import android.view.FocusFinder; 32import android.view.Gravity; 33import android.view.View; 34import android.view.ViewParent; 35import android.view.View.MeasureSpec; 36import android.view.ViewGroup.MarginLayoutParams; 37import android.view.ViewGroup; 38import android.view.animation.DecelerateInterpolator; 39import android.view.animation.Interpolator; 40 41import java.io.PrintWriter; 42import java.io.StringWriter; 43import java.util.ArrayList; 44import java.util.List; 45 46final class GridLayoutManager extends RecyclerView.LayoutManager { 47 48 /* 49 * LayoutParams for {@link HorizontalGridView} and {@link VerticalGridView}. 50 * The class currently does three internal jobs: 51 * - Saves optical bounds insets. 52 * - Caches focus align view center. 53 * - Manages child view layout animation. 54 */ 55 static class LayoutParams extends RecyclerView.LayoutParams { 56 57 // The view is saved only during animation. 58 private View mView; 59 60 // For placement 61 private int mLeftInset; 62 private int mTopInset; 63 private int mRighInset; 64 private int mBottomInset; 65 66 // For alignment 67 private int mAlignX; 68 private int mAlignY; 69 70 // For animations 71 private TimeAnimator mAnimator; 72 private long mDuration; 73 private boolean mFirstAttached; 74 // current virtual view position (scrollOffset + left/top) in the GridLayoutManager 75 private int mViewX, mViewY; 76 private int mSize; 77 // animation start value of translation x and y 78 private float mAnimationStartTranslationX, mAnimationStartTranslationY; 79 80 // The direction this view should be laid out along the primary dimension. 81 private boolean mLayoutForward; 82 83 // Orientation of the grid layout 84 private int mOrientation; 85 86 public LayoutParams(Context c, AttributeSet attrs) { 87 super(c, attrs); 88 } 89 90 public LayoutParams(int width, int height) { 91 super(width, height); 92 } 93 94 public LayoutParams(MarginLayoutParams source) { 95 super(source); 96 } 97 98 public LayoutParams(ViewGroup.LayoutParams source) { 99 super(source); 100 } 101 102 public LayoutParams(RecyclerView.LayoutParams source) { 103 super(source); 104 } 105 106 public LayoutParams(LayoutParams source) { 107 super(source); 108 } 109 110 void onViewAttached() { 111 endAnimate(); 112 mFirstAttached = true; 113 } 114 115 void onViewDetached() { 116 endAnimate(); 117 } 118 119 int getAlignX() { 120 return mAlignX; 121 } 122 123 int getAlignY() { 124 return mAlignY; 125 } 126 127 int getOpticalLeft(View view) { 128 return view.getLeft() + mLeftInset; 129 } 130 131 int getOpticalTop(View view) { 132 return view.getTop() + mTopInset; 133 } 134 135 int getOpticalRight(View view) { 136 return view.getRight() - mRighInset; 137 } 138 139 int getOpticalBottom(View view) { 140 return view.getBottom() - mBottomInset; 141 } 142 143 int getOpticalWidth(View view) { 144 return view.getWidth() - mLeftInset - mRighInset; 145 } 146 147 int getOpticalHeight(View view) { 148 return view.getHeight() - mTopInset - mBottomInset; 149 } 150 151 void setAlignX(int alignX) { 152 mAlignX = alignX; 153 } 154 155 void setAlignY(int alignY) { 156 mAlignY = alignY; 157 } 158 159 void setOpticalInsets(int leftInset, int topInset, int rightInset, int bottomInset) { 160 mLeftInset = leftInset; 161 mTopInset = topInset; 162 mRighInset = rightInset; 163 mBottomInset = bottomInset; 164 } 165 166 private TimeAnimator.TimeListener mTimeListener = new TimeAnimator.TimeListener() { 167 @Override 168 public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) { 169 if (mView == null) { 170 return; 171 } 172 if (totalTime >= mDuration) { 173 endAnimate(); 174 } else { 175 float fraction = (float) (totalTime / (double)mDuration); 176 float fractionToEnd = 1 - mAnimator 177 .getInterpolator().getInterpolation(fraction); 178 if (mOrientation == HORIZONTAL) { 179 if (mLayoutForward) { 180 mView.setTranslationX(fractionToEnd * mAnimationStartTranslationX); 181 } else { 182 mView.setTranslationX(fractionToEnd * mAnimationStartTranslationX - 183 fractionToEnd * (mView.getMeasuredWidth() - mSize)); 184 } 185 } else { 186 if (mLayoutForward) { 187 mView.setTranslationY(fractionToEnd * mAnimationStartTranslationY); 188 } else { 189 mView.setTranslationY(fractionToEnd * mAnimationStartTranslationY - 190 fractionToEnd * (mView.getMeasuredHeight() - mSize)); 191 } 192 } 193 invalidateItemDecoration(); 194 } 195 } 196 }; 197 198 void startAnimate(GridLayoutManager layout, View view, long startDelay) { 199 if (mAnimator == null) { 200 mAnimator = new TimeAnimator(); 201 mAnimator.setTimeListener(mTimeListener); 202 } 203 if (mFirstAttached) { 204 // first time record the initial location and return without animation 205 // TODO do we need initial animation? 206 mViewX = layout.getScrollOffsetX() + getOpticalLeft(view); 207 mViewY = layout.getScrollOffsetY() + getOpticalTop(view); 208 mOrientation = layout.mOrientation; 209 mSize = mOrientation == HORIZONTAL ? view.getMeasuredWidth() : view.getMeasuredHeight(); 210 mFirstAttached = false; 211 return; 212 } 213 mView = view; 214 int newViewX = layout.getScrollOffsetX() + getOpticalLeft(mView); 215 int newViewY = layout.getScrollOffsetY() + getOpticalTop(mView); 216 if (newViewX != mViewX || newViewY != mViewY) { 217 mAnimator.cancel(); 218 mAnimationStartTranslationX = mView.getTranslationX(); 219 mAnimationStartTranslationY = mView.getTranslationY(); 220 mAnimationStartTranslationX += mViewX - newViewX; 221 mAnimationStartTranslationY += mViewY - newViewY; 222 mDuration = layout.getChildLayoutAnimationDuration(); 223 mAnimator.setDuration(mDuration); 224 mAnimator.setInterpolator(layout.getChildLayoutAnimationInterpolator()); 225 mAnimator.setStartDelay(startDelay); 226 mAnimator.start(); 227 mViewX = newViewX; 228 mViewY = newViewY; 229 } 230 } 231 232 void endAnimate() { 233 if (mAnimator != null) { 234 mAnimator.end(); 235 } 236 if (mView != null) { 237 mSize = mOrientation == HORIZONTAL ? 238 mView.getMeasuredWidth() : mView.getMeasuredHeight(); 239 mView.setTranslationX(0); 240 mView.setTranslationY(0); 241 mView = null; 242 } 243 } 244 245 private void invalidateItemDecoration() { 246 ViewParent parent = mView.getParent(); 247 if (parent instanceof RecyclerView) { 248 // TODO: we only need invalidate parent if it has ItemDecoration 249 ((RecyclerView) parent).invalidate(); 250 } 251 } 252 } 253 254 private static final String TAG = "GridLayoutManager"; 255 private static final boolean DEBUG = false; 256 257 private static final Interpolator sDefaultAnimationChildLayoutInterpolator 258 = new DecelerateInterpolator(); 259 260 private static final long DEFAULT_CHILD_ANIMATION_DURATION_MS = 250; 261 262 private String getTag() { 263 return TAG + ":" + mBaseGridView.getId(); 264 } 265 266 private final BaseGridView mBaseGridView; 267 268 /** 269 * The orientation of a "row". 270 */ 271 private int mOrientation = HORIZONTAL; 272 273 private RecyclerView.Adapter mAdapter; 274 private RecyclerView.Recycler mRecycler; 275 276 private boolean mInLayout = false; 277 278 private OnChildSelectedListener mChildSelectedListener = null; 279 280 /** 281 * The focused position, it's not the currently visually aligned position 282 * but it is the final position that we intend to focus on. If there are 283 * multiple setSelection() called, mFocusPosition saves last value. 284 */ 285 private int mFocusPosition = NO_POSITION; 286 287 /** 288 * Force a full layout under certain situations. 289 */ 290 private boolean mForceFullLayout; 291 292 /** 293 * The scroll offsets of the viewport relative to the entire view. 294 */ 295 private int mScrollOffsetPrimary; 296 private int mScrollOffsetSecondary; 297 298 /** 299 * User-specified row height/column width. Can be WRAP_CONTENT. 300 */ 301 private int mRowSizeSecondaryRequested; 302 303 /** 304 * The fixed size of each grid item in the secondary direction. This corresponds to 305 * the row height, equal for all rows. Grid items may have variable length 306 * in the primary direction. 307 */ 308 private int mFixedRowSizeSecondary; 309 310 /** 311 * Tracks the secondary size of each row. 312 */ 313 private int[] mRowSizeSecondary; 314 315 /** 316 * Flag controlling whether the current/next layout should 317 * be updating the secondary size of rows. 318 */ 319 private boolean mRowSecondarySizeRefresh; 320 321 /** 322 * The maximum measured size of the view. 323 */ 324 private int mMaxSizeSecondary; 325 326 /** 327 * Margin between items. 328 */ 329 private int mHorizontalMargin; 330 /** 331 * Margin between items vertically. 332 */ 333 private int mVerticalMargin; 334 /** 335 * Margin in main direction. 336 */ 337 private int mMarginPrimary; 338 /** 339 * Margin in second direction. 340 */ 341 private int mMarginSecondary; 342 /** 343 * How to position child in secondary direction. 344 */ 345 private int mGravity = Gravity.LEFT | Gravity.TOP; 346 /** 347 * The number of rows in the grid. 348 */ 349 private int mNumRows; 350 /** 351 * Number of rows requested, can be 0 to be determined by parent size and 352 * rowHeight. 353 */ 354 private int mNumRowsRequested = 1; 355 356 /** 357 * Tracking start/end position of each row for visible items. 358 */ 359 private StaggeredGrid.Row[] mRows; 360 361 /** 362 * Saves grid information of each view. 363 */ 364 private StaggeredGrid mGrid; 365 /** 366 * Position of first item (included) that has attached views. 367 */ 368 private int mFirstVisiblePos; 369 /** 370 * Position of last item (included) that has attached views. 371 */ 372 private int mLastVisiblePos; 373 374 /** 375 * Focus Scroll strategy. 376 */ 377 private int mFocusScrollStrategy = BaseGridView.FOCUS_SCROLL_ALIGNED; 378 /** 379 * Defines how item view is aligned in the window. 380 */ 381 private final WindowAlignment mWindowAlignment = new WindowAlignment(); 382 383 /** 384 * Defines how item view is aligned. 385 */ 386 private final ItemAlignment mItemAlignment = new ItemAlignment(); 387 388 /** 389 * Dimensions of the view, width or height depending on orientation. 390 */ 391 private int mSizePrimary; 392 393 /** 394 * Allow DPAD key to navigate out at the front of the View (where position = 0), 395 * default is false. 396 */ 397 private boolean mFocusOutFront; 398 399 /** 400 * Allow DPAD key to navigate out at the end of the view, default is false. 401 */ 402 private boolean mFocusOutEnd; 403 404 /** 405 * True if focus search is disabled. 406 */ 407 private boolean mFocusSearchDisabled; 408 409 /** 410 * Animate layout changes from a child resizing or adding/removing a child. 411 */ 412 private boolean mAnimateChildLayout = true; 413 414 /** 415 * Interpolator used to animate layout of children. 416 */ 417 private Interpolator mAnimateLayoutChildInterpolator = sDefaultAnimationChildLayoutInterpolator; 418 419 /** 420 * Duration used to animate layout of children. 421 */ 422 private long mAnimateLayoutChildDuration = DEFAULT_CHILD_ANIMATION_DURATION_MS; 423 424 public GridLayoutManager(BaseGridView baseGridView) { 425 mBaseGridView = baseGridView; 426 } 427 428 public void setOrientation(int orientation) { 429 if (orientation != HORIZONTAL && orientation != VERTICAL) { 430 if (DEBUG) Log.v(getTag(), "invalid orientation: " + orientation); 431 return; 432 } 433 434 mOrientation = orientation; 435 mWindowAlignment.setOrientation(orientation); 436 mItemAlignment.setOrientation(orientation); 437 mForceFullLayout = true; 438 } 439 440 public int getFocusScrollStrategy() { 441 return mFocusScrollStrategy; 442 } 443 444 public void setFocusScrollStrategy(int focusScrollStrategy) { 445 mFocusScrollStrategy = focusScrollStrategy; 446 } 447 448 public void setWindowAlignment(int windowAlignment) { 449 mWindowAlignment.mainAxis().setWindowAlignment(windowAlignment); 450 } 451 452 public int getWindowAlignment() { 453 return mWindowAlignment.mainAxis().getWindowAlignment(); 454 } 455 456 public void setWindowAlignmentOffset(int alignmentOffset) { 457 mWindowAlignment.mainAxis().setWindowAlignmentOffset(alignmentOffset); 458 } 459 460 public int getWindowAlignmentOffset() { 461 return mWindowAlignment.mainAxis().getWindowAlignmentOffset(); 462 } 463 464 public void setWindowAlignmentOffsetPercent(float offsetPercent) { 465 mWindowAlignment.mainAxis().setWindowAlignmentOffsetPercent(offsetPercent); 466 } 467 468 public float getWindowAlignmentOffsetPercent() { 469 return mWindowAlignment.mainAxis().getWindowAlignmentOffsetPercent(); 470 } 471 472 public void setItemAlignmentOffset(int alignmentOffset) { 473 mItemAlignment.mainAxis().setItemAlignmentOffset(alignmentOffset); 474 updateChildAlignments(); 475 } 476 477 public int getItemAlignmentOffset() { 478 return mItemAlignment.mainAxis().getItemAlignmentOffset(); 479 } 480 481 public void setItemAlignmentOffsetPercent(float offsetPercent) { 482 mItemAlignment.mainAxis().setItemAlignmentOffsetPercent(offsetPercent); 483 updateChildAlignments(); 484 } 485 486 public float getItemAlignmentOffsetPercent() { 487 return mItemAlignment.mainAxis().getItemAlignmentOffsetPercent(); 488 } 489 490 public void setItemAlignmentViewId(int viewId) { 491 mItemAlignment.mainAxis().setItemAlignmentViewId(viewId); 492 updateChildAlignments(); 493 } 494 495 public int getItemAlignmentViewId() { 496 return mItemAlignment.mainAxis().getItemAlignmentViewId(); 497 } 498 499 public void setFocusOutAllowed(boolean throughFront, boolean throughEnd) { 500 mFocusOutFront = throughFront; 501 mFocusOutEnd = throughEnd; 502 } 503 504 public void setNumRows(int numRows) { 505 if (numRows < 0) throw new IllegalArgumentException(); 506 mNumRowsRequested = numRows; 507 mForceFullLayout = true; 508 } 509 510 /** 511 * Set the row height. May be WRAP_CONTENT, or a size in pixels. 512 */ 513 public void setRowHeight(int height) { 514 if (height >= 0 || height == ViewGroup.LayoutParams.WRAP_CONTENT) { 515 mRowSizeSecondaryRequested = height; 516 } else { 517 throw new IllegalArgumentException("Invalid row height: " + height); 518 } 519 } 520 521 public void setItemMargin(int margin) { 522 mVerticalMargin = mHorizontalMargin = margin; 523 mMarginPrimary = mMarginSecondary = margin; 524 } 525 526 public void setVerticalMargin(int margin) { 527 if (mOrientation == HORIZONTAL) { 528 mMarginSecondary = mVerticalMargin = margin; 529 } else { 530 mMarginPrimary = mVerticalMargin = margin; 531 } 532 } 533 534 public void setHorizontalMargin(int margin) { 535 if (mOrientation == HORIZONTAL) { 536 mMarginPrimary = mHorizontalMargin = margin; 537 } else { 538 mMarginSecondary = mHorizontalMargin = margin; 539 } 540 } 541 542 public int getVerticalMargin() { 543 return mVerticalMargin; 544 } 545 546 public int getHorizontalMargin() { 547 return mHorizontalMargin; 548 } 549 550 public void setGravity(int gravity) { 551 mGravity = gravity; 552 } 553 554 protected boolean hasDoneFirstLayout() { 555 return mGrid != null; 556 } 557 558 public void setOnChildSelectedListener(OnChildSelectedListener listener) { 559 mChildSelectedListener = listener; 560 } 561 562 private int getPositionByView(View view) { 563 return getPositionByIndex(mBaseGridView.indexOfChild(view)); 564 } 565 566 private int getPositionByIndex(int index) { 567 if (index < 0) { 568 return NO_POSITION; 569 } 570 return mFirstVisiblePos + index; 571 } 572 573 private View getViewByPosition(int position) { 574 int index = getIndexByPosition(position); 575 if (index < 0) { 576 return null; 577 } 578 return getChildAt(index); 579 } 580 581 private int getIndexByPosition(int position) { 582 if (mFirstVisiblePos < 0 || 583 position < mFirstVisiblePos || position > mLastVisiblePos) { 584 return NO_POSITION; 585 } 586 return position - mFirstVisiblePos; 587 } 588 589 private void dispatchChildSelected() { 590 if (mChildSelectedListener == null) { 591 return; 592 } 593 594 View view = getViewByPosition(mFocusPosition); 595 596 if (mFocusPosition != NO_POSITION) { 597 mChildSelectedListener.onChildSelected(mBaseGridView, view, mFocusPosition, 598 mAdapter.getItemId(mFocusPosition)); 599 } else { 600 mChildSelectedListener.onChildSelected(mBaseGridView, null, NO_POSITION, NO_ID); 601 } 602 } 603 604 @Override 605 public boolean canScrollHorizontally() { 606 // We can scroll horizontally if we have horizontal orientation, or if 607 // we are vertical and have more than one column. 608 return mOrientation == HORIZONTAL || mNumRows > 1; 609 } 610 611 @Override 612 public boolean canScrollVertically() { 613 // We can scroll vertically if we have vertical orientation, or if we 614 // are horizontal and have more than one row. 615 return mOrientation == VERTICAL || mNumRows > 1; 616 } 617 618 @Override 619 public RecyclerView.LayoutParams generateDefaultLayoutParams() { 620 return new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 621 ViewGroup.LayoutParams.WRAP_CONTENT); 622 } 623 624 @Override 625 public RecyclerView.LayoutParams generateLayoutParams(Context context, AttributeSet attrs) { 626 return new LayoutParams(context, attrs); 627 } 628 629 @Override 630 public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) { 631 if (lp instanceof LayoutParams) { 632 return new LayoutParams((LayoutParams) lp); 633 } else if (lp instanceof RecyclerView.LayoutParams) { 634 return new LayoutParams((RecyclerView.LayoutParams) lp); 635 } else if (lp instanceof MarginLayoutParams) { 636 return new LayoutParams((MarginLayoutParams) lp); 637 } else { 638 return new LayoutParams(lp); 639 } 640 } 641 642 protected View getViewForPosition(int position) { 643 View v = mRecycler.getViewForPosition(mAdapter, position); 644 if (v != null) { 645 ((LayoutParams) v.getLayoutParams()).onViewAttached(); 646 } 647 return v; 648 } 649 650 final int getOpticalLeft(View v) { 651 return ((LayoutParams) v.getLayoutParams()).getOpticalLeft(v); 652 } 653 654 final int getOpticalRight(View v) { 655 return ((LayoutParams) v.getLayoutParams()).getOpticalRight(v); 656 } 657 658 final int getOpticalTop(View v) { 659 return ((LayoutParams) v.getLayoutParams()).getOpticalTop(v); 660 } 661 662 final int getOpticalBottom(View v) { 663 return ((LayoutParams) v.getLayoutParams()).getOpticalBottom(v); 664 } 665 666 private int getViewMin(View v) { 667 return (mOrientation == HORIZONTAL) ? getOpticalLeft(v) : getOpticalTop(v); 668 } 669 670 private int getViewMax(View v) { 671 return (mOrientation == HORIZONTAL) ? getOpticalRight(v) : getOpticalBottom(v); 672 } 673 674 private int getViewCenter(View view) { 675 return (mOrientation == HORIZONTAL) ? getViewCenterX(view) : getViewCenterY(view); 676 } 677 678 private int getViewCenterSecondary(View view) { 679 return (mOrientation == HORIZONTAL) ? getViewCenterY(view) : getViewCenterX(view); 680 } 681 682 private int getViewCenterX(View v) { 683 LayoutParams p = (LayoutParams) v.getLayoutParams(); 684 return p.getOpticalLeft(v) + p.getAlignX(); 685 } 686 687 private int getViewCenterY(View v) { 688 LayoutParams p = (LayoutParams) v.getLayoutParams(); 689 return p.getOpticalTop(v) + p.getAlignY(); 690 } 691 692 private void setViewLayoutForward(View v, boolean layoutForward) { 693 LayoutParams p = (LayoutParams) v.getLayoutParams(); 694 p.mLayoutForward = layoutForward; 695 } 696 697 private boolean getIsViewLayoutForward(View v) { 698 return ((LayoutParams) v.getLayoutParams()).mLayoutForward; 699 } 700 701 /** 702 * Re-initialize data structures for a data change or handling invisible 703 * selection. The method tries its best to preserve position information so 704 * that staggered grid looks same before and after re-initialize. 705 * @param focusPosition The initial focusPosition that we would like to 706 * focus on. 707 * @return Actual position that can be focused on. 708 */ 709 private int init(RecyclerView.Adapter adapter, RecyclerView.Recycler recycler, 710 int focusPosition) { 711 712 final int newItemCount = adapter.getItemCount(); 713 714 if (focusPosition == NO_POSITION && newItemCount > 0) { 715 // if focus position is never set before, initialize it to 0 716 focusPosition = 0; 717 } 718 // If adapter has changed then caches are invalid; otherwise, 719 // we try to maintain each row's position if number of rows keeps the same 720 // and existing mGrid contains the focusPosition. 721 if (mRows != null && mNumRows == mRows.length && 722 mGrid != null && mGrid.getSize() > 0 && focusPosition >= 0 && 723 focusPosition >= mGrid.getFirstIndex() && 724 focusPosition <= mGrid.getLastIndex()) { 725 // strip mGrid to a subset (like a column) that contains focusPosition 726 mGrid.stripDownTo(focusPosition); 727 // make sure that remaining items do not exceed new adapter size 728 int firstIndex = mGrid.getFirstIndex(); 729 int lastIndex = mGrid.getLastIndex(); 730 if (DEBUG) { 731 Log .v(getTag(), "mGrid firstIndex " + firstIndex + " lastIndex " + lastIndex); 732 } 733 for (int i = lastIndex; i >=firstIndex; i--) { 734 if (i >= newItemCount) { 735 mGrid.removeLast(); 736 } 737 } 738 if (mGrid.getSize() == 0) { 739 focusPosition = newItemCount - 1; 740 // initialize row start locations 741 for (int i = 0; i < mNumRows; i++) { 742 mRows[i].low = 0; 743 mRows[i].high = 0; 744 } 745 if (DEBUG) Log.v(getTag(), "mGrid zero size"); 746 } else { 747 // initialize row start locations 748 for (int i = 0; i < mNumRows; i++) { 749 mRows[i].low = Integer.MAX_VALUE; 750 mRows[i].high = Integer.MIN_VALUE; 751 } 752 firstIndex = mGrid.getFirstIndex(); 753 lastIndex = mGrid.getLastIndex(); 754 if (focusPosition > lastIndex) { 755 focusPosition = mGrid.getLastIndex(); 756 } 757 if (DEBUG) { 758 Log.v(getTag(), "mGrid firstIndex " + firstIndex + " lastIndex " 759 + lastIndex + " focusPosition " + focusPosition); 760 } 761 // fill rows with minimal view positions of the subset 762 for (int i = firstIndex; i <= lastIndex; i++) { 763 View v = getViewByPosition(i); 764 if (v == null) { 765 continue; 766 } 767 int row = mGrid.getLocation(i).row; 768 int low = getViewMin(v) + mScrollOffsetPrimary; 769 if (low < mRows[row].low) { 770 mRows[row].low = mRows[row].high = low; 771 } 772 } 773 // fill other rows that does not include the subset using first item 774 int firstItemRowPosition = mRows[mGrid.getLocation(firstIndex).row].low; 775 if (firstItemRowPosition == Integer.MAX_VALUE) { 776 firstItemRowPosition = 0; 777 } 778 for (int i = 0; i < mNumRows; i++) { 779 if (mRows[i].low == Integer.MAX_VALUE) { 780 mRows[i].low = mRows[i].high = firstItemRowPosition; 781 } 782 } 783 } 784 785 // Same adapter, we can reuse any attached views 786 detachAndScrapAttachedViews(recycler); 787 788 } else { 789 // otherwise recreate data structure 790 mRows = new StaggeredGrid.Row[mNumRows]; 791 mRowSizeSecondary = new int[mNumRows]; 792 793 for (int i = 0; i < mNumRows; i++) { 794 mRows[i] = new StaggeredGrid.Row(); 795 } 796 mGrid = new StaggeredGridDefault(); 797 if (newItemCount == 0) { 798 focusPosition = NO_POSITION; 799 } else if (focusPosition >= newItemCount) { 800 focusPosition = newItemCount - 1; 801 } 802 803 // Adapter may have changed so remove all attached views permanently 804 removeAllViews(); 805 806 mScrollOffsetPrimary = 0; 807 mScrollOffsetSecondary = 0; 808 mWindowAlignment.reset(); 809 } 810 811 mAdapter = adapter; 812 mRecycler = recycler; 813 mGrid.setProvider(mGridProvider); 814 // mGrid share the same Row array information 815 mGrid.setRows(mRows); 816 mFirstVisiblePos = mLastVisiblePos = NO_POSITION; 817 818 initScrollController(); 819 updateScrollSecondAxis(); 820 821 return focusPosition; 822 } 823 824 private int getRowSizeSecondary(int rowIndex) { 825 if (mFixedRowSizeSecondary != 0) { 826 return mFixedRowSizeSecondary; 827 } 828 if (mRowSizeSecondary == null) { 829 return 0; 830 } 831 return mRowSizeSecondary[rowIndex]; 832 } 833 834 private int getRowStartSecondary(int rowIndex) { 835 int start = 0; 836 for (int i = 0; i < rowIndex; i++) { 837 start += getRowSizeSecondary(i) + mMarginSecondary; 838 } 839 return start; 840 } 841 842 private int getSizeSecondary() { 843 return getRowStartSecondary(mNumRows - 1) + getRowSizeSecondary(mNumRows - 1); 844 } 845 846 private boolean processRowSizeSecondary(boolean measure) { 847 if (mFixedRowSizeSecondary != 0) { 848 return false; 849 } 850 851 List<Integer>[] rows = mGrid.getItemPositionsInRows(mFirstVisiblePos, mLastVisiblePos); 852 boolean changed = false; 853 854 for (int rowIndex = 0; rowIndex < mNumRows; rowIndex++) { 855 int rowSize = 0; 856 857 final int rowItemCount = rows[rowIndex].size(); 858 if (DEBUG) Log.v(getTag(), "processRowSizeSecondary row " + rowIndex + 859 " rowItemCount " + rowItemCount); 860 861 for (int i = 0; i < rowItemCount; i++) { 862 final int position = rows[rowIndex].get(i); 863 final View view = getViewByPosition(position); 864 if (measure && view.isLayoutRequested()) { 865 measureChild(view, rowIndex); 866 } 867 // If this view isn't visible, we ignore it. 868 if (getOpticalRight(view) < 0 || getOpticalLeft(view) > getWidth() || 869 getOpticalBottom(view) < 0 || getOpticalTop(view) > getHeight()) { 870 continue; 871 } 872 final int secondarySize = mOrientation == HORIZONTAL ? 873 view.getMeasuredHeight() : view.getMeasuredWidth(); 874 if (secondarySize > rowSize) { 875 rowSize = secondarySize; 876 } 877 } 878 if (DEBUG) Log.v(getTag(), "row " + rowIndex + " rowItemCount " + rowItemCount + 879 " rowSize " + rowSize); 880 881 if (mRowSizeSecondary[rowIndex] != rowSize) { 882 if (DEBUG) Log.v(getTag(), "row size secondary changed: " + mRowSizeSecondary[rowIndex] + 883 ", " + rowSize); 884 885 mRowSizeSecondary[rowIndex] = rowSize; 886 changed = true; 887 } 888 } 889 890 return changed; 891 } 892 893 /** 894 * Checks if we need to update row secondary sizes. 895 */ 896 private void updateRowSecondarySizeRefresh() { 897 mRowSecondarySizeRefresh = processRowSizeSecondary(false); 898 if (mRowSecondarySizeRefresh) { 899 if (DEBUG) Log.v(getTag(), "mRowSecondarySizeRefresh now set"); 900 forceRequestLayout(); 901 } 902 } 903 904 private void forceRequestLayout() { 905 if (DEBUG) Log.v(getTag(), "forceRequestLayout"); 906 // RecyclerView prevents us from requesting layout in many cases 907 // (during layout, during scroll, etc.) 908 // For secondary row size wrap_content support we currently need a 909 // second layout pass to update the measured size after having measured 910 // and added child views in layoutChildren. 911 // Force the second layout by posting a delayed runnable. 912 // TODO: investigate allowing a second layout pass, 913 // or move child add/measure logic to the measure phase. 914 mBaseGridView.getHandler().post(new Runnable() { 915 @Override 916 public void run() { 917 if (DEBUG) Log.v(getTag(), "request Layout from runnable"); 918 requestLayout(); 919 } 920 }); 921 } 922 923 @Override 924 public void onMeasure(int widthSpec, int heightSpec) { 925 int sizePrimary, sizeSecondary, modeSecondary, paddingSecondary; 926 int measuredSizeSecondary; 927 if (mOrientation == HORIZONTAL) { 928 sizePrimary = MeasureSpec.getSize(widthSpec); 929 sizeSecondary = MeasureSpec.getSize(heightSpec); 930 modeSecondary = MeasureSpec.getMode(heightSpec); 931 paddingSecondary = getPaddingTop() + getPaddingBottom(); 932 } else { 933 sizeSecondary = MeasureSpec.getSize(widthSpec); 934 sizePrimary = MeasureSpec.getSize(heightSpec); 935 modeSecondary = MeasureSpec.getMode(widthSpec); 936 paddingSecondary = getPaddingLeft() + getPaddingRight(); 937 } 938 if (DEBUG) Log.v(getTag(), "onMeasure widthSpec " + Integer.toHexString(widthSpec) + 939 " heightSpec " + Integer.toHexString(heightSpec) + 940 " modeSecondary " + Integer.toHexString(modeSecondary) + 941 " sizeSecondary " + sizeSecondary + " " + this); 942 943 mMaxSizeSecondary = sizeSecondary; 944 945 if (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) { 946 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 947 mFixedRowSizeSecondary = 0; 948 949 // Measure all current children and update cached row heights 950 if (mGrid != null) { 951 processRowSizeSecondary(true); 952 } 953 954 switch (modeSecondary) { 955 case MeasureSpec.UNSPECIFIED: 956 measuredSizeSecondary = getSizeSecondary() + paddingSecondary; 957 break; 958 case MeasureSpec.AT_MOST: 959 measuredSizeSecondary = Math.min(getSizeSecondary() + paddingSecondary, 960 mMaxSizeSecondary); 961 break; 962 case MeasureSpec.EXACTLY: 963 measuredSizeSecondary = mMaxSizeSecondary; 964 break; 965 default: 966 throw new IllegalStateException("wrong spec"); 967 } 968 969 } else { 970 switch (modeSecondary) { 971 case MeasureSpec.UNSPECIFIED: 972 if (mRowSizeSecondaryRequested == 0) { 973 if (mOrientation == HORIZONTAL) { 974 throw new IllegalStateException("Must specify rowHeight or view height"); 975 } else { 976 throw new IllegalStateException("Must specify columnWidth or view width"); 977 } 978 } 979 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 980 mNumRows = mNumRowsRequested == 0 ? 1 : mNumRowsRequested; 981 measuredSizeSecondary = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 982 * (mNumRows - 1) + paddingSecondary; 983 break; 984 case MeasureSpec.AT_MOST: 985 case MeasureSpec.EXACTLY: 986 if (mNumRowsRequested == 0 && mRowSizeSecondaryRequested == 0) { 987 mNumRows = 1; 988 mFixedRowSizeSecondary = sizeSecondary - paddingSecondary; 989 } else if (mNumRowsRequested == 0) { 990 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 991 mNumRows = (sizeSecondary + mMarginSecondary) 992 / (mRowSizeSecondaryRequested + mMarginSecondary); 993 } else if (mRowSizeSecondaryRequested == 0) { 994 mNumRows = mNumRowsRequested; 995 mFixedRowSizeSecondary = (sizeSecondary - paddingSecondary - mMarginSecondary 996 * (mNumRows - 1)) / mNumRows; 997 } else { 998 mNumRows = mNumRowsRequested; 999 mFixedRowSizeSecondary = mRowSizeSecondaryRequested; 1000 } 1001 measuredSizeSecondary = sizeSecondary; 1002 if (modeSecondary == MeasureSpec.AT_MOST) { 1003 int childrenSize = mFixedRowSizeSecondary * mNumRows + mMarginSecondary 1004 * (mNumRows - 1) + paddingSecondary; 1005 if (childrenSize < measuredSizeSecondary) { 1006 measuredSizeSecondary = childrenSize; 1007 } 1008 } 1009 break; 1010 default: 1011 throw new IllegalStateException("wrong spec"); 1012 } 1013 } 1014 if (mOrientation == HORIZONTAL) { 1015 setMeasuredDimension(sizePrimary, measuredSizeSecondary); 1016 } else { 1017 setMeasuredDimension(measuredSizeSecondary, sizePrimary); 1018 } 1019 if (DEBUG) { 1020 Log.v(getTag(), "onMeasure sizePrimary " + sizePrimary + 1021 " measuredSizeSecondary " + measuredSizeSecondary + 1022 " mFixedRowSizeSecondary " + mFixedRowSizeSecondary + 1023 " mNumRows " + mNumRows); 1024 } 1025 } 1026 1027 private void measureChild(View child, int rowIndex) { 1028 final ViewGroup.LayoutParams lp = child.getLayoutParams(); 1029 final int secondarySpec = (mRowSizeSecondaryRequested == ViewGroup.LayoutParams.WRAP_CONTENT) ? 1030 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED) : 1031 MeasureSpec.makeMeasureSpec(mFixedRowSizeSecondary, MeasureSpec.EXACTLY); 1032 int widthSpec, heightSpec; 1033 1034 if (mOrientation == HORIZONTAL) { 1035 widthSpec = ViewGroup.getChildMeasureSpec( 1036 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1037 0, lp.width); 1038 heightSpec = ViewGroup.getChildMeasureSpec(secondarySpec, 0, lp.height); 1039 } else { 1040 heightSpec = ViewGroup.getChildMeasureSpec( 1041 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 1042 0, lp.height); 1043 widthSpec = ViewGroup.getChildMeasureSpec(secondarySpec, 0, lp.width); 1044 } 1045 1046 child.measure(widthSpec, heightSpec); 1047 1048 if (DEBUG) Log.v(getTag(), "measureChild secondarySpec " + Integer.toHexString(secondarySpec) + 1049 " widthSpec " + Integer.toHexString(widthSpec) + 1050 " heightSpec " + Integer.toHexString(heightSpec) + 1051 " measuredWidth " + child.getMeasuredWidth() + 1052 " measuredHeight " + child.getMeasuredHeight()); 1053 if (DEBUG) Log.v(getTag(), "child lp width " + lp.width + " height " + lp.height); 1054 } 1055 1056 private StaggeredGrid.Provider mGridProvider = new StaggeredGrid.Provider() { 1057 1058 @Override 1059 public int getCount() { 1060 return mAdapter.getItemCount(); 1061 } 1062 1063 @Override 1064 public void createItem(int index, int rowIndex, boolean append) { 1065 View v = getViewForPosition(index); 1066 if (mFirstVisiblePos >= 0) { 1067 // when StaggeredGrid append or prepend item, we must guarantee 1068 // that sibling item has created views already. 1069 if (append && index != mLastVisiblePos + 1) { 1070 throw new RuntimeException(); 1071 } else if (!append && index != mFirstVisiblePos - 1) { 1072 throw new RuntimeException(); 1073 } 1074 } 1075 1076 if (append) { 1077 addView(v); 1078 } else { 1079 addView(v, 0); 1080 } 1081 1082 measureChild(v, rowIndex); 1083 1084 int length = mOrientation == HORIZONTAL ? v.getMeasuredWidth() : v.getMeasuredHeight(); 1085 int start, end; 1086 if (append) { 1087 start = mRows[rowIndex].high; 1088 if (start != mRows[rowIndex].low) { 1089 // if there are existing item in the row, add margin between 1090 start += mMarginPrimary; 1091 } else { 1092 final int lastRow = mRows.length - 1; 1093 if (lastRow != rowIndex && mRows[lastRow].high != mRows[lastRow].low) { 1094 // if there are existing item in the last row, insert 1095 // the new item after the last item of last row. 1096 start = mRows[lastRow].high + mMarginPrimary; 1097 } 1098 } 1099 end = start + length; 1100 mRows[rowIndex].high = end; 1101 } else { 1102 end = mRows[rowIndex].low; 1103 if (end != mRows[rowIndex].high) { 1104 end -= mMarginPrimary; 1105 } else if (0 != rowIndex && mRows[0].high != mRows[0].low) { 1106 // if there are existing item in the first row, insert 1107 // the new item before the first item of first row. 1108 end = mRows[0].low - mMarginPrimary; 1109 } 1110 start = end - length; 1111 mRows[rowIndex].low = start; 1112 } 1113 if (mFirstVisiblePos < 0) { 1114 mFirstVisiblePos = mLastVisiblePos = index; 1115 } else { 1116 if (append) { 1117 mLastVisiblePos++; 1118 } else { 1119 mFirstVisiblePos--; 1120 } 1121 } 1122 if (DEBUG) Log.v(getTag(), "start " + start + " end " + end); 1123 int startSecondary = getRowStartSecondary(rowIndex) - mScrollOffsetSecondary; 1124 layoutChild(rowIndex, v, start - mScrollOffsetPrimary, end - mScrollOffsetPrimary, 1125 startSecondary); 1126 if (DEBUG) { 1127 Log.d(getTag(), "addView " + index + " " + v); 1128 } 1129 updateScrollMin(); 1130 updateScrollMax(); 1131 1132 setViewLayoutForward(v, append); 1133 } 1134 }; 1135 1136 private void layoutChild(int rowIndex, View v, int start, int end, int startSecondary) { 1137 int sizeSecondary = mOrientation == HORIZONTAL ? v.getMeasuredHeight() 1138 : v.getMeasuredWidth(); 1139 if (mFixedRowSizeSecondary > 0) { 1140 sizeSecondary = Math.min(sizeSecondary, mFixedRowSizeSecondary); 1141 } 1142 final int verticalGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK; 1143 final int horizontalGravity = mGravity & Gravity.HORIZONTAL_GRAVITY_MASK; 1144 if (mOrientation == HORIZONTAL && verticalGravity == Gravity.TOP 1145 || mOrientation == VERTICAL && horizontalGravity == Gravity.LEFT) { 1146 // do nothing 1147 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.BOTTOM 1148 || mOrientation == VERTICAL && horizontalGravity == Gravity.RIGHT) { 1149 startSecondary += getRowSizeSecondary(rowIndex) - sizeSecondary; 1150 } else if (mOrientation == HORIZONTAL && verticalGravity == Gravity.CENTER_VERTICAL 1151 || mOrientation == VERTICAL && horizontalGravity == Gravity.CENTER_HORIZONTAL) { 1152 startSecondary += (getRowSizeSecondary(rowIndex) - sizeSecondary) / 2; 1153 } 1154 int left, top, right, bottom; 1155 if (mOrientation == HORIZONTAL) { 1156 left = start; 1157 top = startSecondary; 1158 right = end; 1159 bottom = startSecondary + sizeSecondary; 1160 } else { 1161 top = start; 1162 left = startSecondary; 1163 bottom = end; 1164 right = startSecondary + sizeSecondary; 1165 } 1166 v.layout(left, top, right, bottom); 1167 updateChildOpticalInsets(v, left, top, right, bottom); 1168 updateChildAlignments(v); 1169 } 1170 1171 private void updateChildOpticalInsets(View v, int left, int top, int right, int bottom) { 1172 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1173 p.setOpticalInsets(left - v.getLeft(), top - v.getTop(), 1174 v.getRight() - right, v.getBottom() - bottom); 1175 } 1176 1177 private void updateChildAlignments(View v) { 1178 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1179 p.setAlignX(mItemAlignment.horizontal.getAlignmentPosition(v)); 1180 p.setAlignY(mItemAlignment.vertical.getAlignmentPosition(v)); 1181 } 1182 1183 private void updateChildAlignments() { 1184 for (int i = 0, c = getChildCount(); i < c; i++) { 1185 updateChildAlignments(getChildAt(i)); 1186 } 1187 } 1188 1189 private boolean needsAppendVisibleItem() { 1190 if (mLastVisiblePos < mFocusPosition) { 1191 return true; 1192 } 1193 int right = mScrollOffsetPrimary + mSizePrimary; 1194 for (int i = 0; i < mNumRows; i++) { 1195 if (mRows[i].low == mRows[i].high) { 1196 if (mRows[i].high < right) { 1197 return true; 1198 } 1199 } else if (mRows[i].high < right - mMarginPrimary) { 1200 return true; 1201 } 1202 } 1203 return false; 1204 } 1205 1206 private boolean needsPrependVisibleItem() { 1207 if (mFirstVisiblePos > mFocusPosition) { 1208 return true; 1209 } 1210 for (int i = 0; i < mNumRows; i++) { 1211 if (mRows[i].low == mRows[i].high) { 1212 if (mRows[i].low > mScrollOffsetPrimary) { 1213 return true; 1214 } 1215 } else if (mRows[i].low - mMarginPrimary > mScrollOffsetPrimary) { 1216 return true; 1217 } 1218 } 1219 return false; 1220 } 1221 1222 // Append one column if possible and return true if reach end. 1223 private boolean appendOneVisibleItem() { 1224 while (true) { 1225 if (mLastVisiblePos != NO_POSITION && mLastVisiblePos < mAdapter.getItemCount() -1 && 1226 mLastVisiblePos < mGrid.getLastIndex()) { 1227 // append invisible view of saved location till last row 1228 final int index = mLastVisiblePos + 1; 1229 final int row = mGrid.getLocation(index).row; 1230 mGridProvider.createItem(index, row, true); 1231 if (row == mNumRows - 1) { 1232 return false; 1233 } 1234 } else if ((mLastVisiblePos == NO_POSITION && mAdapter.getItemCount() > 0) || 1235 (mLastVisiblePos != NO_POSITION && 1236 mLastVisiblePos < mAdapter.getItemCount() - 1)) { 1237 mGrid.appendItems(mScrollOffsetPrimary + mSizePrimary); 1238 return false; 1239 } else { 1240 return true; 1241 } 1242 } 1243 } 1244 1245 private void appendVisibleItems() { 1246 while (needsAppendVisibleItem()) { 1247 if (appendOneVisibleItem()) { 1248 break; 1249 } 1250 } 1251 } 1252 1253 // Prepend one column if possible and return true if reach end. 1254 private boolean prependOneVisibleItem() { 1255 while (true) { 1256 if (mFirstVisiblePos > 0) { 1257 if (mFirstVisiblePos > mGrid.getFirstIndex()) { 1258 // prepend invisible view of saved location till first row 1259 final int index = mFirstVisiblePos - 1; 1260 final int row = mGrid.getLocation(index).row; 1261 mGridProvider.createItem(index, row, false); 1262 if (row == 0) { 1263 return false; 1264 } 1265 } else { 1266 mGrid.prependItems(mScrollOffsetPrimary); 1267 return false; 1268 } 1269 } else { 1270 return true; 1271 } 1272 } 1273 } 1274 1275 private void prependVisibleItems() { 1276 while (needsPrependVisibleItem()) { 1277 if (prependOneVisibleItem()) { 1278 break; 1279 } 1280 } 1281 } 1282 1283 private void removeChildAt(int position) { 1284 View v = getViewByPosition(position); 1285 if (v != null) { 1286 if (DEBUG) { 1287 Log.d(getTag(), "removeAndRecycleViewAt " + position); 1288 } 1289 ((LayoutParams) v.getLayoutParams()).onViewDetached(); 1290 removeAndRecycleViewAt(getIndexByPosition(position), mRecycler); 1291 } 1292 } 1293 1294 private void removeInvisibleViewsAtEnd() { 1295 boolean update = false; 1296 while(mLastVisiblePos > mFirstVisiblePos && mLastVisiblePos > mFocusPosition) { 1297 View view = getViewByPosition(mLastVisiblePos); 1298 if (getViewMin(view) > mSizePrimary) { 1299 removeChildAt(mLastVisiblePos); 1300 mLastVisiblePos--; 1301 update = true; 1302 } else { 1303 break; 1304 } 1305 } 1306 if (update) { 1307 updateRowsMinMax(); 1308 } 1309 } 1310 1311 private void removeInvisibleViewsAtFront() { 1312 boolean update = false; 1313 while(mLastVisiblePos > mFirstVisiblePos && mFirstVisiblePos < mFocusPosition) { 1314 View view = getViewByPosition(mFirstVisiblePos); 1315 if (getViewMax(view) < 0) { 1316 removeChildAt(mFirstVisiblePos); 1317 mFirstVisiblePos++; 1318 update = true; 1319 } else { 1320 break; 1321 } 1322 } 1323 if (update) { 1324 updateRowsMinMax(); 1325 } 1326 } 1327 1328 private void updateRowsMinMax() { 1329 if (mFirstVisiblePos < 0) { 1330 return; 1331 } 1332 for (int i = 0; i < mNumRows; i++) { 1333 mRows[i].low = Integer.MAX_VALUE; 1334 mRows[i].high = Integer.MIN_VALUE; 1335 } 1336 for (int i = mFirstVisiblePos; i <= mLastVisiblePos; i++) { 1337 View view = getViewByPosition(i); 1338 int row = mGrid.getLocation(i).row; 1339 int low = getViewMin(view) + mScrollOffsetPrimary; 1340 if (low < mRows[row].low) { 1341 mRows[row].low = low; 1342 } 1343 int high = getViewMax(view) + mScrollOffsetPrimary; 1344 if (high > mRows[row].high) { 1345 mRows[row].high = high; 1346 } 1347 } 1348 } 1349 1350 // Fast layout when there is no structure change, adapter change, etc. 1351 protected void fastRelayout() { 1352 initScrollController(); 1353 1354 List<Integer>[] rows = mGrid.getItemPositionsInRows(mFirstVisiblePos, mLastVisiblePos); 1355 1356 // relayout and repositioning views on each row 1357 for (int i = 0; i < mNumRows; i++) { 1358 List<Integer> row = rows[i]; 1359 final int startSecondary = getRowStartSecondary(i) - mScrollOffsetSecondary; 1360 for (int j = 0, size = row.size(); j < size; j++) { 1361 final int position = row.get(j); 1362 final View view = getViewByPosition(position); 1363 final boolean layoutForward = getIsViewLayoutForward(view); 1364 int primaryDelta, start, end; 1365 1366 if (mOrientation == HORIZONTAL) { 1367 final int primarySize = view.getMeasuredWidth(); 1368 if (view.isLayoutRequested()) { 1369 measureChild(view, i); 1370 } 1371 if (layoutForward) { 1372 start = getViewMin(view); 1373 end = start + view.getMeasuredWidth(); 1374 primaryDelta = view.getMeasuredWidth() - primarySize; 1375 if (primaryDelta != 0) { 1376 for (int k = j + 1; k < size; k++) { 1377 getViewByPosition(row.get(k)).offsetLeftAndRight(primaryDelta); 1378 } 1379 } 1380 } else { 1381 end = getViewMax(view); 1382 start = end - view.getMeasuredWidth(); 1383 primaryDelta = primarySize - view.getMeasuredWidth(); 1384 if (primaryDelta != 0) { 1385 for (int k = 0; k < j; k++) { 1386 getViewByPosition(row.get(k)).offsetLeftAndRight(primaryDelta); 1387 } 1388 } 1389 } 1390 } else { 1391 final int primarySize = view.getMeasuredHeight(); 1392 if (view.isLayoutRequested()) { 1393 measureChild(view, i); 1394 } 1395 if (layoutForward) { 1396 start = getViewMin(view); 1397 end = start + view.getMeasuredHeight(); 1398 primaryDelta = view.getMeasuredHeight() - primarySize; 1399 if (primaryDelta != 0) { 1400 for (int k = j + 1; k < size; k++) { 1401 getViewByPosition(row.get(k)).offsetTopAndBottom(primaryDelta); 1402 } 1403 } 1404 } else { 1405 end = getViewMax(view); 1406 start = end - view.getMeasuredHeight(); 1407 primaryDelta = primarySize - view.getMeasuredHeight(); 1408 if (primaryDelta != 0) { 1409 for (int k = 0; k < j; k++) { 1410 getViewByPosition(row.get(k)).offsetTopAndBottom(primaryDelta); 1411 } 1412 } 1413 } 1414 } 1415 layoutChild(i, view, start, end, startSecondary); 1416 } 1417 } 1418 1419 appendVisibleItems(); 1420 prependVisibleItems(); 1421 1422 updateRowsMinMax(); 1423 updateScrollMin(); 1424 updateScrollMax(); 1425 updateScrollSecondAxis(); 1426 1427 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED) { 1428 View focusView = getViewByPosition(mFocusPosition == NO_POSITION ? 0 : mFocusPosition); 1429 scrollToView(focusView, false); 1430 } 1431 } 1432 1433 // Lays out items based on the current scroll position 1434 @Override 1435 public void onLayoutChildren(RecyclerView.Adapter adapter, RecyclerView.Recycler recycler, 1436 boolean structureChanged, RecyclerView.State state) { 1437 if (DEBUG) { 1438 Log.v(getTag(), "layoutChildren start numRows " + mNumRows + " mScrollOffsetSecondary " 1439 + mScrollOffsetSecondary + " mScrollOffsetPrimary " + mScrollOffsetPrimary 1440 + " structureChanged " + structureChanged 1441 + " mForceFullLayout " + mForceFullLayout); 1442 Log.v(getTag(), "width " + getWidth() + " height " + getHeight()); 1443 } 1444 1445 if (mNumRows == 0) { 1446 // haven't done measure yet 1447 return; 1448 } 1449 final int itemCount = adapter.getItemCount(); 1450 if (itemCount < 0) { 1451 return; 1452 } 1453 1454 mInLayout = true; 1455 1456 // Track the old focus view so we can adjust our system scroll position 1457 // so that any scroll animations happening now will remain valid. 1458 int delta = 0, deltaSecondary = 0; 1459 if (mFocusPosition != NO_POSITION 1460 && mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED) { 1461 View focusView = getViewByPosition(mFocusPosition); 1462 if (focusView != null) { 1463 delta = mWindowAlignment.mainAxis().getSystemScrollPos( 1464 getViewCenter(focusView) + mScrollOffsetPrimary) - mScrollOffsetPrimary; 1465 deltaSecondary = 1466 mWindowAlignment.secondAxis().getSystemScrollPos( 1467 getViewCenterSecondary(focusView) + mScrollOffsetSecondary) 1468 - mScrollOffsetSecondary; 1469 } 1470 } 1471 1472 boolean hasDoneFirstLayout = hasDoneFirstLayout(); 1473 if (!structureChanged && !mForceFullLayout && hasDoneFirstLayout) { 1474 fastRelayout(); 1475 } else { 1476 boolean hadFocus = mBaseGridView.hasFocus(); 1477 1478 int newFocusPosition = init(adapter, recycler, mFocusPosition); 1479 if (DEBUG) { 1480 Log.v(getTag(), "mFocusPosition " + mFocusPosition + " newFocusPosition " 1481 + newFocusPosition); 1482 } 1483 1484 // depending on result of init(), either recreating everything 1485 // or try to reuse the row start positions near mFocusPosition 1486 if (mGrid.getSize() == 0) { 1487 // this is a fresh creating all items, starting from 1488 // mFocusPosition with a estimated row index. 1489 mGrid.setStart(newFocusPosition, StaggeredGrid.START_DEFAULT); 1490 1491 // Can't track the old focus view 1492 delta = deltaSecondary = 0; 1493 1494 } else { 1495 // mGrid remembers Locations for the column that 1496 // contains mFocusePosition and also mRows remembers start 1497 // positions of each row. 1498 // Manually re-create child views for that column 1499 int firstIndex = mGrid.getFirstIndex(); 1500 int lastIndex = mGrid.getLastIndex(); 1501 for (int i = firstIndex; i <= lastIndex; i++) { 1502 mGridProvider.createItem(i, mGrid.getLocation(i).row, true); 1503 } 1504 } 1505 // add visible views at end until reach the end of window 1506 appendVisibleItems(); 1507 // add visible views at front until reach the start of window 1508 prependVisibleItems(); 1509 // multiple rounds: scrollToView of first round may drag first/last child into 1510 // "visible window" and we update scrollMin/scrollMax then run second scrollToView 1511 int oldFirstVisible; 1512 int oldLastVisible; 1513 do { 1514 oldFirstVisible = mFirstVisiblePos; 1515 oldLastVisible = mLastVisiblePos; 1516 View focusView = getViewByPosition(newFocusPosition); 1517 // we need force to initialize the child view's position 1518 scrollToView(focusView, false); 1519 if (focusView != null && hadFocus) { 1520 focusView.requestFocus(); 1521 } 1522 appendVisibleItems(); 1523 prependVisibleItems(); 1524 removeInvisibleViewsAtFront(); 1525 removeInvisibleViewsAtEnd(); 1526 } while (mFirstVisiblePos != oldFirstVisible || mLastVisiblePos != oldLastVisible); 1527 } 1528 mForceFullLayout = false; 1529 1530 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_ALIGNED) { 1531 scrollDirectionPrimary(-delta); 1532 scrollDirectionSecondary(-deltaSecondary); 1533 } 1534 appendVisibleItems(); 1535 prependVisibleItems(); 1536 removeInvisibleViewsAtFront(); 1537 removeInvisibleViewsAtEnd(); 1538 1539 if (DEBUG) { 1540 StringWriter sw = new StringWriter(); 1541 PrintWriter pw = new PrintWriter(sw); 1542 mGrid.debugPrint(pw); 1543 Log.d(getTag(), sw.toString()); 1544 } 1545 1546 removeAndRecycleScrap(recycler); 1547 attemptAnimateLayoutChild(); 1548 1549 if (mRowSecondarySizeRefresh) { 1550 mRowSecondarySizeRefresh = false; 1551 } else { 1552 updateRowSecondarySizeRefresh(); 1553 } 1554 1555 if (!hasDoneFirstLayout) { 1556 dispatchChildSelected(); 1557 } 1558 mInLayout = false; 1559 if (DEBUG) Log.v(getTag(), "layoutChildren end"); 1560 } 1561 1562 private void offsetChildrenSecondary(int increment) { 1563 final int childCount = getChildCount(); 1564 if (mOrientation == HORIZONTAL) { 1565 for (int i = 0; i < childCount; i++) { 1566 getChildAt(i).offsetTopAndBottom(increment); 1567 } 1568 } else { 1569 for (int i = 0; i < childCount; i++) { 1570 getChildAt(i).offsetLeftAndRight(increment); 1571 } 1572 } 1573 mScrollOffsetSecondary -= increment; 1574 } 1575 1576 private void offsetChildrenPrimary(int increment) { 1577 final int childCount = getChildCount(); 1578 if (mOrientation == VERTICAL) { 1579 for (int i = 0; i < childCount; i++) { 1580 getChildAt(i).offsetTopAndBottom(increment); 1581 } 1582 } else { 1583 for (int i = 0; i < childCount; i++) { 1584 getChildAt(i).offsetLeftAndRight(increment); 1585 } 1586 } 1587 mScrollOffsetPrimary -= increment; 1588 } 1589 1590 @Override 1591 public int scrollHorizontallyBy(int dx, Adapter adapter, Recycler recycler, 1592 RecyclerView.State state) { 1593 if (DEBUG) Log.v(TAG, "scrollHorizontallyBy " + dx); 1594 1595 if (mOrientation == HORIZONTAL) { 1596 return scrollDirectionPrimary(dx); 1597 } else { 1598 return scrollDirectionSecondary(dx); 1599 } 1600 } 1601 1602 @Override 1603 public int scrollVerticallyBy(int dy, Adapter adapter, Recycler recycler, 1604 RecyclerView.State state) { 1605 if (DEBUG) Log.v(TAG, "scrollVerticallyBy " + dy); 1606 if (mOrientation == VERTICAL) { 1607 return scrollDirectionPrimary(dy); 1608 } else { 1609 return scrollDirectionSecondary(dy); 1610 } 1611 } 1612 1613 // scroll in main direction may add/prune views 1614 private int scrollDirectionPrimary(int da) { 1615 offsetChildrenPrimary(-da); 1616 if (mInLayout) { 1617 return da; 1618 } 1619 1620 int childCount = getChildCount(); 1621 boolean updated; 1622 1623 if (da > 0) { 1624 appendVisibleItems(); 1625 } else if (da < 0) { 1626 prependVisibleItems(); 1627 } 1628 updated = getChildCount() > childCount; 1629 childCount = getChildCount(); 1630 1631 if (da > 0) { 1632 removeInvisibleViewsAtFront(); 1633 } else if (da < 0) { 1634 removeInvisibleViewsAtEnd(); 1635 } 1636 updated |= getChildCount() < childCount; 1637 1638 attemptAnimateLayoutChild(); 1639 if (updated) { 1640 updateRowSecondarySizeRefresh(); 1641 } 1642 1643 mBaseGridView.invalidate(); 1644 return da; 1645 } 1646 1647 // scroll in second direction will not add/prune views 1648 private int scrollDirectionSecondary(int dy) { 1649 offsetChildrenSecondary(-dy); 1650 mBaseGridView.invalidate(); 1651 return dy; 1652 } 1653 1654 private void updateScrollMax() { 1655 if (mLastVisiblePos >= 0 && mLastVisiblePos == mAdapter.getItemCount() - 1) { 1656 int maxEdge = Integer.MIN_VALUE; 1657 for (int i = 0; i < mRows.length; i++) { 1658 if (mRows[i].high > maxEdge) { 1659 maxEdge = mRows[i].high; 1660 } 1661 } 1662 mWindowAlignment.mainAxis().setMaxEdge(maxEdge); 1663 if (DEBUG) Log.v(getTag(), "updating scroll maxEdge to " + maxEdge); 1664 } 1665 } 1666 1667 private void updateScrollMin() { 1668 if (mFirstVisiblePos == 0) { 1669 int minEdge = Integer.MAX_VALUE; 1670 for (int i = 0; i < mRows.length; i++) { 1671 if (mRows[i].low < minEdge) { 1672 minEdge = mRows[i].low; 1673 } 1674 } 1675 mWindowAlignment.mainAxis().setMinEdge(minEdge); 1676 if (DEBUG) Log.v(getTag(), "updating scroll minEdge to " + minEdge); 1677 } 1678 } 1679 1680 private void updateScrollSecondAxis() { 1681 mWindowAlignment.secondAxis().setMinEdge(0); 1682 mWindowAlignment.secondAxis().setMaxEdge(getSizeSecondary()); 1683 } 1684 1685 private void initScrollController() { 1686 mWindowAlignment.horizontal.setSize(getWidth()); 1687 mWindowAlignment.horizontal.setPadding(getPaddingLeft(), getPaddingRight()); 1688 mWindowAlignment.vertical.setSize(getHeight()); 1689 mWindowAlignment.vertical.setPadding(getPaddingTop(), getPaddingBottom()); 1690 mSizePrimary = mWindowAlignment.mainAxis().getSize(); 1691 mWindowAlignment.mainAxis().invalidateScrollMin(); 1692 mWindowAlignment.mainAxis().invalidateScrollMax(); 1693 1694 if (DEBUG) { 1695 Log.v(getTag(), "initScrollController mSizePrimary " + mSizePrimary 1696 + " mWindowAlignment " + mWindowAlignment); 1697 } 1698 } 1699 1700 public void setSelection(RecyclerView parent, int position) { 1701 setSelection(parent, position, false); 1702 } 1703 1704 public void setSelectionSmooth(RecyclerView parent, int position) { 1705 setSelection(parent, position, true); 1706 } 1707 1708 public int getSelection() { 1709 return mFocusPosition; 1710 } 1711 1712 public void setSelection(RecyclerView parent, int position, boolean smooth) { 1713 if (mFocusPosition == position) { 1714 return; 1715 } 1716 View view = getViewByPosition(position); 1717 if (view != null) { 1718 scrollToView(view, smooth); 1719 } else { 1720 boolean right = position > mFocusPosition; 1721 mFocusPosition = position; 1722 if (smooth) { 1723 if (!hasDoneFirstLayout()) { 1724 Log.w(getTag(), "setSelectionSmooth should " + 1725 "not be called before first layout pass"); 1726 return; 1727 } 1728 if (right) { 1729 appendVisibleItems(); 1730 } else { 1731 prependVisibleItems(); 1732 } 1733 scrollToView(getViewByPosition(position), smooth); 1734 } else { 1735 mForceFullLayout = true; 1736 parent.requestLayout(); 1737 } 1738 } 1739 } 1740 1741 @Override 1742 public void onItemsAdded(RecyclerView recyclerView, int positionStart, int itemCount) { 1743 boolean needsLayout = false; 1744 if (itemCount != 0) { 1745 if (mFirstVisiblePos < 0) { 1746 needsLayout = true; 1747 } else if (!(positionStart > mLastVisiblePos + 1 || 1748 positionStart + itemCount < mFirstVisiblePos - 1)) { 1749 needsLayout = true; 1750 } 1751 } 1752 if (needsLayout) { 1753 recyclerView.requestLayout(); 1754 } 1755 } 1756 1757 @Override 1758 public boolean onRequestChildFocus(RecyclerView parent, View child, View focused) { 1759 if (mFocusSearchDisabled) { 1760 return true; 1761 } 1762 if (!mInLayout) { 1763 scrollToView(child, true); 1764 } 1765 return true; 1766 } 1767 1768 @Override 1769 public boolean requestChildRectangleOnScreen(RecyclerView parent, View view, Rect rect, 1770 boolean immediate) { 1771 if (DEBUG) Log.v(getTag(), "requestChildRectangleOnScreen " + view + " " + rect); 1772 return false; 1773 } 1774 1775 int getScrollOffsetX() { 1776 return mOrientation == HORIZONTAL ? mScrollOffsetPrimary : mScrollOffsetSecondary; 1777 } 1778 1779 int getScrollOffsetY() { 1780 return mOrientation == HORIZONTAL ? mScrollOffsetSecondary : mScrollOffsetPrimary; 1781 } 1782 1783 public void getViewSelectedOffsets(View view, int[] offsets) { 1784 int scrollOffsetX = getScrollOffsetX(); 1785 int scrollOffsetY = getScrollOffsetY(); 1786 int viewCenterX = scrollOffsetX + getViewCenterX(view); 1787 int viewCenterY = scrollOffsetY + getViewCenterY(view); 1788 offsets[0] = mWindowAlignment.horizontal.getSystemScrollPos(viewCenterX) - scrollOffsetX; 1789 offsets[1] = mWindowAlignment.vertical.getSystemScrollPos(viewCenterY) - scrollOffsetY; 1790 } 1791 1792 /** 1793 * Scroll to a given child view and change mFocusPosition. 1794 */ 1795 private void scrollToView(View view, boolean smooth) { 1796 int newFocusPosition = getPositionByView(view); 1797 if (mInLayout || newFocusPosition != mFocusPosition) { 1798 mFocusPosition = newFocusPosition; 1799 dispatchChildSelected(); 1800 } 1801 if (mBaseGridView.isChildrenDrawingOrderEnabledInternal()) { 1802 mBaseGridView.invalidate(); 1803 } 1804 if (view == null) { 1805 return; 1806 } 1807 if (!view.hasFocus() && mBaseGridView.hasFocus()) { 1808 // transfer focus to the child if it does not have focus yet (e.g. triggered 1809 // by setSelection()) 1810 view.requestFocus(); 1811 } 1812 switch (mFocusScrollStrategy) { 1813 case BaseGridView.FOCUS_SCROLL_ALIGNED: 1814 default: 1815 scrollToAlignedPosition(view, smooth); 1816 break; 1817 case BaseGridView.FOCUS_SCROLL_ITEM: 1818 case BaseGridView.FOCUS_SCROLL_PAGE: 1819 scrollItemOrPage(view, smooth); 1820 break; 1821 } 1822 } 1823 1824 private void scrollItemOrPage(View view, boolean smooth) { 1825 int pos = getPositionByView(view); 1826 int viewMin = getViewMin(view); 1827 int viewMax = getViewMax(view); 1828 // we either align "firstView" to left/top padding edge 1829 // or align "lastView" to right/bottom padding edge 1830 View firstView = null; 1831 View lastView = null; 1832 int paddingLow = mWindowAlignment.mainAxis().getPaddingLow(); 1833 int clientSize = mWindowAlignment.mainAxis().getClientSize(); 1834 final int row = mGrid.getLocation(pos).row; 1835 if (viewMin < paddingLow) { 1836 // view enters low padding area: 1837 firstView = view; 1838 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 1839 // scroll one "page" left/top, 1840 // align first visible item of the "page" at the low padding edge. 1841 while (!prependOneVisibleItem()) { 1842 List<Integer> positions = 1843 mGrid.getItemPositionsInRows(mFirstVisiblePos, pos)[row]; 1844 firstView = getViewByPosition(positions.get(0)); 1845 if (viewMax - getViewMin(firstView) > clientSize) { 1846 if (positions.size() > 1) { 1847 firstView = getViewByPosition(positions.get(1)); 1848 } 1849 break; 1850 } 1851 } 1852 } 1853 } else if (viewMax > clientSize + paddingLow) { 1854 // view enters high padding area: 1855 if (mFocusScrollStrategy == BaseGridView.FOCUS_SCROLL_PAGE) { 1856 // scroll whole one page right/bottom, align view at the low padding edge. 1857 firstView = view; 1858 do { 1859 List<Integer> positions = 1860 mGrid.getItemPositionsInRows(pos, mLastVisiblePos)[row]; 1861 lastView = getViewByPosition(positions.get(positions.size() - 1)); 1862 if (getViewMax(lastView) - viewMin > clientSize) { 1863 lastView = null; 1864 break; 1865 } 1866 } while (!appendOneVisibleItem()); 1867 if (lastView != null) { 1868 // however if we reached end, we should align last view. 1869 firstView = null; 1870 } 1871 } else { 1872 lastView = view; 1873 } 1874 } 1875 int scrollPrimary = 0; 1876 int scrollSecondary = 0; 1877 if (firstView != null) { 1878 scrollPrimary = getViewMin(firstView) - paddingLow; 1879 } else if (lastView != null) { 1880 scrollPrimary = getViewMax(lastView) - (paddingLow + clientSize); 1881 } 1882 View secondaryAlignedView; 1883 if (firstView != null) { 1884 secondaryAlignedView = firstView; 1885 } else if (lastView != null) { 1886 secondaryAlignedView = lastView; 1887 } else { 1888 secondaryAlignedView = view; 1889 } 1890 int viewCenterSecondary = mScrollOffsetSecondary + 1891 getViewCenterSecondary(secondaryAlignedView); 1892 mWindowAlignment.secondAxis().updateScrollCenter(viewCenterSecondary); 1893 scrollSecondary = mWindowAlignment.secondAxis().getSystemScrollPos(); 1894 scrollSecondary -= mScrollOffsetSecondary; 1895 scrollGrid(scrollPrimary, scrollSecondary, smooth); 1896 } 1897 1898 private void scrollToAlignedPosition(View view, boolean smooth) { 1899 int viewCenterPrimary = mScrollOffsetPrimary + getViewCenter(view); 1900 int viewCenterSecondary = mScrollOffsetSecondary + getViewCenterSecondary(view); 1901 if (DEBUG) { 1902 Log.v(getTag(), "scrollAligned smooth=" + smooth + " pos=" + mFocusPosition + " " 1903 + viewCenterPrimary +","+viewCenterSecondary + " " + mWindowAlignment); 1904 } 1905 1906 if (mInLayout || viewCenterPrimary != mWindowAlignment.mainAxis().getScrollCenter() 1907 || viewCenterSecondary != mWindowAlignment.secondAxis().getScrollCenter()) { 1908 mWindowAlignment.mainAxis().updateScrollCenter(viewCenterPrimary); 1909 mWindowAlignment.secondAxis().updateScrollCenter(viewCenterSecondary); 1910 int scrollPrimary = mWindowAlignment.mainAxis().getSystemScrollPos(); 1911 int scrollSecondary = mWindowAlignment.secondAxis().getSystemScrollPos(); 1912 if (DEBUG) { 1913 Log.v(getTag(), "scrollAligned " + scrollPrimary + " " + scrollSecondary 1914 +" " + mWindowAlignment); 1915 } 1916 1917 scrollPrimary -= mScrollOffsetPrimary; 1918 scrollSecondary -= mScrollOffsetSecondary; 1919 1920 scrollGrid(scrollPrimary, scrollSecondary, smooth); 1921 } 1922 } 1923 1924 private void scrollGrid(int scrollPrimary, int scrollSecondary, boolean smooth) { 1925 if (mInLayout) { 1926 scrollDirectionPrimary(scrollPrimary); 1927 scrollDirectionSecondary(scrollSecondary); 1928 } else { 1929 int scrollX; 1930 int scrollY; 1931 if (mOrientation == HORIZONTAL) { 1932 scrollX = scrollPrimary; 1933 scrollY = scrollSecondary; 1934 } else { 1935 scrollX = scrollSecondary; 1936 scrollY = scrollPrimary; 1937 } 1938 if (smooth) { 1939 mBaseGridView.smoothScrollBy(scrollX, scrollY); 1940 } else { 1941 mBaseGridView.scrollBy(scrollX, scrollY); 1942 } 1943 } 1944 } 1945 1946 public void setAnimateChildLayout(boolean animateChildLayout) { 1947 mAnimateChildLayout = animateChildLayout; 1948 for (int i = 0, c = getChildCount(); i < c; i++) { 1949 View v = getChildAt(i); 1950 LayoutParams p = (LayoutParams) v.getLayoutParams(); 1951 if (!mAnimateChildLayout) { 1952 p.endAnimate(); 1953 } else { 1954 // record initial location values 1955 p.mFirstAttached = true; 1956 p.startAnimate(this, v, 0); 1957 } 1958 } 1959 } 1960 1961 private void attemptAnimateLayoutChild() { 1962 if (!mAnimateChildLayout) { 1963 return; 1964 } 1965 for (int i = 0, c = getChildCount(); i < c; i++) { 1966 // TODO: start delay can be staggered 1967 View v = getChildAt(i); 1968 ((LayoutParams) v.getLayoutParams()).startAnimate(this, v, 0); 1969 } 1970 } 1971 1972 public boolean isChildLayoutAnimated() { 1973 return mAnimateChildLayout; 1974 } 1975 1976 public void setChildLayoutAnimationInterpolator(Interpolator interpolator) { 1977 mAnimateLayoutChildInterpolator = interpolator; 1978 } 1979 1980 public Interpolator getChildLayoutAnimationInterpolator() { 1981 return mAnimateLayoutChildInterpolator; 1982 } 1983 1984 public void setChildLayoutAnimationDuration(long duration) { 1985 mAnimateLayoutChildDuration = duration; 1986 } 1987 1988 public long getChildLayoutAnimationDuration() { 1989 return mAnimateLayoutChildDuration; 1990 } 1991 1992 private int findImmediateChildIndex(View view) { 1993 while (view != null && view != mBaseGridView) { 1994 int index = mBaseGridView.indexOfChild(view); 1995 if (index >= 0) { 1996 return index; 1997 } 1998 view = (View) view.getParent(); 1999 } 2000 return NO_POSITION; 2001 } 2002 2003 void setFocusSearchDisabled(boolean disabled) { 2004 mFocusSearchDisabled = disabled; 2005 } 2006 2007 boolean isFocusSearchDisabled() { 2008 return mFocusSearchDisabled; 2009 } 2010 2011 @Override 2012 public View onInterceptFocusSearch(View focused, int direction) { 2013 if (mFocusSearchDisabled) { 2014 return focused; 2015 } 2016 return null; 2017 } 2018 2019 boolean hasNextViewInSameRow(int pos) { 2020 if (mGrid == null || pos == NO_POSITION) { 2021 return false; 2022 } 2023 final int focusedRow = mGrid.getLocation(pos).row; 2024 for (int i = 0, count = getChildCount(); i < count; i++) { 2025 int position = getPositionByIndex(i); 2026 StaggeredGrid.Location loc = mGrid.getLocation(position); 2027 if (loc != null && loc.row == focusedRow) { 2028 if (position > pos) { 2029 return true; 2030 } 2031 } 2032 } 2033 return false; 2034 } 2035 2036 boolean hasPreviousViewInSameRow(int pos) { 2037 if (mGrid == null || pos == NO_POSITION) { 2038 return false; 2039 } 2040 final int focusedRow = mGrid.getLocation(pos).row; 2041 for (int i = getChildCount() - 1; i >= 0; i--) { 2042 int position = getPositionByIndex(i); 2043 StaggeredGrid.Location loc = mGrid.getLocation(position); 2044 if (loc != null && loc.row == focusedRow) { 2045 if (position < pos) { 2046 return true; 2047 } 2048 } 2049 } 2050 return false; 2051 } 2052 2053 @Override 2054 public boolean onAddFocusables(RecyclerView recyclerView, 2055 ArrayList<View> views, int direction, int focusableMode) { 2056 if (mFocusSearchDisabled) { 2057 return true; 2058 } 2059 // If this viewgroup or one of its children currently has focus then we 2060 // consider our children for focus searching in main direction on the same row. 2061 // If this viewgroup has no focus and using focus align, we want the system 2062 // to ignore our children and pass focus to the viewgroup, which will pass 2063 // focus on to its children appropriately. 2064 // If this viewgroup has no focus and not using focus align, we want to 2065 // consider the child that does not overlap with padding area. 2066 if (recyclerView.hasFocus()) { 2067 final int movement = getMovement(direction); 2068 if (movement != PREV_ITEM && movement != NEXT_ITEM) { 2069 // Move on secondary direction uses default addFocusables(). 2070 return false; 2071 } 2072 final View focused = recyclerView.findFocus(); 2073 final int focusedPos = getPositionByIndex(findImmediateChildIndex(focused)); 2074 // Add focusables of focused item. 2075 if (focusedPos != NO_POSITION) { 2076 getViewByPosition(focusedPos).addFocusables(views, direction, focusableMode); 2077 } 2078 final int focusedRow = mGrid != null && focusedPos != NO_POSITION ? 2079 mGrid.getLocation(focusedPos).row : NO_POSITION; 2080 // Add focusables of next neighbor of same row on the focus search direction. 2081 if (mGrid != null) { 2082 final int focusableCount = views.size(); 2083 for (int i = 0, count = getChildCount(); i < count; i++) { 2084 int index = movement == NEXT_ITEM ? i : count - 1 - i; 2085 final View child = getChildAt(index); 2086 if (child.getVisibility() != View.VISIBLE) { 2087 continue; 2088 } 2089 int position = getPositionByIndex(index); 2090 StaggeredGrid.Location loc = mGrid.getLocation(position); 2091 if (focusedRow == NO_POSITION || (loc != null && loc.row == focusedRow)) { 2092 if (focusedPos == NO_POSITION || 2093 (movement == NEXT_ITEM && position > focusedPos) 2094 || (movement == PREV_ITEM && position < focusedPos)) { 2095 child.addFocusables(views, direction, focusableMode); 2096 if (views.size() > focusableCount) { 2097 break; 2098 } 2099 } 2100 } 2101 } 2102 } 2103 } else { 2104 if (mFocusScrollStrategy != BaseGridView.FOCUS_SCROLL_ALIGNED) { 2105 // adding views not overlapping padding area to avoid scrolling in gaining focus 2106 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2107 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2108 int focusableCount = views.size(); 2109 for (int i = 0, count = getChildCount(); i < count; i++) { 2110 View child = getChildAt(i); 2111 if (child.getVisibility() == View.VISIBLE) { 2112 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2113 child.addFocusables(views, direction, focusableMode); 2114 } 2115 } 2116 } 2117 // if we cannot find any, then just add all children. 2118 if (views.size() == focusableCount) { 2119 for (int i = 0, count = getChildCount(); i < count; i++) { 2120 View child = getChildAt(i); 2121 if (child.getVisibility() == View.VISIBLE) { 2122 child.addFocusables(views, direction, focusableMode); 2123 } 2124 } 2125 if (views.size() != focusableCount) { 2126 return true; 2127 } 2128 } else { 2129 return true; 2130 } 2131 // if still cannot find any, fall through and add itself 2132 } 2133 if (recyclerView.isFocusable()) { 2134 views.add(recyclerView); 2135 } 2136 } 2137 return true; 2138 } 2139 2140 @Override 2141 public View onFocusSearchFailed(View focused, int direction, Adapter adapter, 2142 Recycler recycler) { 2143 if (DEBUG) Log.v(getTag(), "onFocusSearchFailed direction " + direction); 2144 2145 View view = null; 2146 int movement = getMovement(direction); 2147 final FocusFinder ff = FocusFinder.getInstance(); 2148 if (movement == NEXT_ITEM) { 2149 while (view == null && !appendOneVisibleItem()) { 2150 view = ff.findNextFocus(mBaseGridView, focused, direction); 2151 } 2152 } else if (movement == PREV_ITEM){ 2153 while (view == null && !prependOneVisibleItem()) { 2154 view = ff.findNextFocus(mBaseGridView, focused, direction); 2155 } 2156 } 2157 if (view == null) { 2158 // returning the same view to prevent focus lost when scrolling past the end of the list 2159 if (movement == PREV_ITEM) { 2160 view = mFocusOutFront ? null : focused; 2161 } else if (movement == NEXT_ITEM){ 2162 view = mFocusOutEnd ? null : focused; 2163 } 2164 } 2165 if (DEBUG) Log.v(getTag(), "returning view " + view); 2166 return view; 2167 } 2168 2169 boolean gridOnRequestFocusInDescendants(RecyclerView recyclerView, int direction, 2170 Rect previouslyFocusedRect) { 2171 switch (mFocusScrollStrategy) { 2172 case BaseGridView.FOCUS_SCROLL_ALIGNED: 2173 default: 2174 return gridOnRequestFocusInDescendantsAligned(recyclerView, 2175 direction, previouslyFocusedRect); 2176 case BaseGridView.FOCUS_SCROLL_PAGE: 2177 case BaseGridView.FOCUS_SCROLL_ITEM: 2178 return gridOnRequestFocusInDescendantsUnaligned(recyclerView, 2179 direction, previouslyFocusedRect); 2180 } 2181 } 2182 2183 private boolean gridOnRequestFocusInDescendantsAligned(RecyclerView recyclerView, 2184 int direction, Rect previouslyFocusedRect) { 2185 View view = getViewByPosition(mFocusPosition); 2186 if (view != null) { 2187 boolean result = view.requestFocus(direction, previouslyFocusedRect); 2188 if (!result && DEBUG) { 2189 Log.w(getTag(), "failed to request focus on " + view); 2190 } 2191 return result; 2192 } 2193 return false; 2194 } 2195 2196 private boolean gridOnRequestFocusInDescendantsUnaligned(RecyclerView recyclerView, 2197 int direction, Rect previouslyFocusedRect) { 2198 // focus to view not overlapping padding area to avoid scrolling in gaining focus 2199 int index; 2200 int increment; 2201 int end; 2202 int count = getChildCount(); 2203 if ((direction & View.FOCUS_FORWARD) != 0) { 2204 index = 0; 2205 increment = 1; 2206 end = count; 2207 } else { 2208 index = count - 1; 2209 increment = -1; 2210 end = -1; 2211 } 2212 int left = mWindowAlignment.mainAxis().getPaddingLow(); 2213 int right = mWindowAlignment.mainAxis().getClientSize() + left; 2214 for (int i = index; i != end; i += increment) { 2215 View child = getChildAt(i); 2216 if (child.getVisibility() == View.VISIBLE) { 2217 if (getViewMin(child) >= left && getViewMax(child) <= right) { 2218 if (child.requestFocus(direction, previouslyFocusedRect)) { 2219 return true; 2220 } 2221 } 2222 } 2223 } 2224 return false; 2225 } 2226 2227 private final static int PREV_ITEM = 0; 2228 private final static int NEXT_ITEM = 1; 2229 private final static int PREV_ROW = 2; 2230 private final static int NEXT_ROW = 3; 2231 2232 private int getMovement(int direction) { 2233 int movement = View.FOCUS_LEFT; 2234 2235 if (mOrientation == HORIZONTAL) { 2236 switch(direction) { 2237 case View.FOCUS_LEFT: 2238 movement = PREV_ITEM; 2239 break; 2240 case View.FOCUS_RIGHT: 2241 movement = NEXT_ITEM; 2242 break; 2243 case View.FOCUS_UP: 2244 movement = PREV_ROW; 2245 break; 2246 case View.FOCUS_DOWN: 2247 movement = NEXT_ROW; 2248 break; 2249 } 2250 } else if (mOrientation == VERTICAL) { 2251 switch(direction) { 2252 case View.FOCUS_LEFT: 2253 movement = PREV_ROW; 2254 break; 2255 case View.FOCUS_RIGHT: 2256 movement = NEXT_ROW; 2257 break; 2258 case View.FOCUS_UP: 2259 movement = PREV_ITEM; 2260 break; 2261 case View.FOCUS_DOWN: 2262 movement = NEXT_ITEM; 2263 break; 2264 } 2265 } 2266 2267 return movement; 2268 } 2269 2270 int getChildDrawingOrder(RecyclerView recyclerView, int childCount, int i) { 2271 int focusIndex = getIndexByPosition(mFocusPosition); 2272 if (focusIndex == NO_POSITION) { 2273 return i; 2274 } 2275 // supposely 0 1 2 3 4 5 6 7 8 9, 4 is the center item 2276 // drawing order is 0 1 2 3 9 8 7 6 5 4 2277 if (i < focusIndex) { 2278 return i; 2279 } else if (i < childCount - 1) { 2280 return focusIndex + childCount - 1 - i; 2281 } else { 2282 return focusIndex; 2283 } 2284 } 2285 2286 @Override 2287 public void onAdapterChanged(RecyclerView.Adapter oldAdapter, 2288 RecyclerView.Adapter newAdapter) { 2289 mGrid = null; 2290 mRows = null; 2291 mRowSizeSecondary = null; 2292 mRowSecondarySizeRefresh = false; 2293 super.onAdapterChanged(oldAdapter, newAdapter); 2294 } 2295} 2296