Java 类android.support.v7.widget.RecyclerView.Recycler 实例源码

private int fixLayoutEndGap(int endOffset, Recycler recycler, State state, boolean canOffsetChildren) {
    int gap = this.mOrientationHelper.getEndAfterPadding() - endOffset;
    if (gap <= 0) {
        return 0;
    }
    int fixOffset = -scrollBy(-gap, recycler, state);
    endOffset += fixOffset;
    if (canOffsetChildren) {
        gap = this.mOrientationHelper.getEndAfterPadding() - endOffset;
        if (gap > 0) {
            this.mOrientationHelper.offsetChildren(gap);
            return gap + fixOffset;
        }
    }
    return fixOffset;
}

public void onInitializeAccessibilityNodeInfoForItem(Recycler recycler, State state, View host, AccessibilityNodeInfoCompat info) {
    android.view.ViewGroup.LayoutParams lp = host.getLayoutParams();
    if (lp instanceof LayoutParams) {
        LayoutParams glp = (LayoutParams) lp;
        int spanGroupIndex = getSpanGroupIndex(recycler, state, glp.getViewLayoutPosition());
        if (this.mOrientation == 0) {
            int spanIndex = glp.getSpanIndex();
            int spanSize = glp.getSpanSize();
            boolean z = this.mSpanCount > 1 && glp.getSpanSize() == this.mSpanCount;
            info.setCollectionItemInfo(CollectionItemInfoCompat.obtain(spanIndex, spanSize, spanGroupIndex, 1, z, false));
            return;
        }
        int spanIndex2 = glp.getSpanIndex();
        int spanSize2 = glp.getSpanSize();
        boolean z2 = this.mSpanCount > 1 && glp.getSpanSize() == this.mSpanCount;
        info.setCollectionItemInfo(CollectionItemInfoCompat.obtain(spanGroupIndex, 1, spanIndex2, spanSize2, z2, false));
        return;
    }
    super.onInitializeAccessibilityNodeInfoForItem(host, info);
}

private void ensureAnchorIsInCorrectSpan(Recycler recycler, State state, AnchorInfo anchorInfo, int itemDirection) {
    boolean layingOutInPrimaryDirection = true;
    if (itemDirection != 1) {
        layingOutInPrimaryDirection = false;
    }
    int span = getSpanIndex(recycler, state, anchorInfo.mPosition);
    if (layingOutInPrimaryDirection) {
        while (span > 0 && anchorInfo.mPosition > 0) {
            anchorInfo.mPosition--;
            span = getSpanIndex(recycler, state, anchorInfo.mPosition);
        }
        return;
    }
    int indexLimit = state.getItemCount() - 1;
    int pos = anchorInfo.mPosition;
    int bestSpan = span;
    while (pos < indexLimit) {
        int next = getSpanIndex(recycler, state, pos + 1);
        if (next <= bestSpan) {
            break;
        }
        pos++;
        bestSpan = next;
    }
    anchorInfo.mPosition = pos;
}

private void recycleViewsFromStart(Recycler recycler, int dt) {
    if (dt >= 0) {
        int limit = dt;
        int childCount = getChildCount();
        int i;
        if (this.mShouldReverseLayout) {
            for (i = childCount - 1; i >= 0; i--) {
                if (this.mOrientationHelper.getDecoratedEnd(getChildAt(i)) > limit) {
                    recycleChildren(recycler, childCount - 1, i);
                    return;
                }
            }
            return;
        }
        for (i = 0; i < childCount; i++) {
            if (this.mOrientationHelper.getDecoratedEnd(getChildAt(i)) > limit) {
                recycleChildren(recycler, 0, i);
                return;
            }
        }
    }
}

private int fixLayoutStartGap(int startOffset, Recycler recycler, State state, boolean canOffsetChildren) {
    int gap = startOffset - this.mOrientationHelper.getStartAfterPadding();
    if (gap <= 0) {
        return 0;
    }
    int fixOffset = -scrollBy(gap, recycler, state);
    startOffset += fixOffset;
    if (canOffsetChildren) {
        gap = startOffset - this.mOrientationHelper.getStartAfterPadding();
        if (gap > 0) {
            this.mOrientationHelper.offsetChildren(-gap);
            return fixOffset - gap;
        }
    }
    return fixOffset;
}

private int fixLayoutStartGap(int startOffset, Recycler recycler, State state, boolean canOffsetChildren) {
    int gap = startOffset - this.mOrientationHelper.getStartAfterPadding();
    if (gap <= 0) {
        return 0;
    }
    int fixOffset = -scrollBy(gap, recycler, state);
    startOffset += fixOffset;
    if (canOffsetChildren) {
        gap = startOffset - this.mOrientationHelper.getStartAfterPadding();
        if (gap > 0) {
            this.mOrientationHelper.offsetChildren(-gap);
            return fixOffset - gap;
        }
    }
    return fixOffset;
}

int scrollBy(int dy, Recycler recycler, State state) {
    int i = 0;
    if (!(getChildCount() == 0 || dy == 0)) {
        this.mLayoutState.mRecycle = true;
        ensureLayoutState();
        int layoutDirection = dy > 0 ? 1 : -1;
        int absDy = Math.abs(dy);
        updateLayoutState(layoutDirection, absDy, true, state);
        int consumed = this.mLayoutState.mScrollingOffset + fill(recycler, this.mLayoutState, state, false);
        if (consumed >= 0) {
            if (absDy > consumed) {
                i = layoutDirection * consumed;
            } else {
                i = dy;
            }
            this.mOrientationHelper.offsetChildren(-i);
            this.mLayoutState.mLastScrollDelta = i;
        }
    }
    return i;
}

private void recycleViewsFromStart(Recycler recycler, int dt) {
    if (dt >= 0) {
        int limit = dt;
        int childCount = getChildCount();
        int i;
        if (this.mShouldReverseLayout) {
            for (i = childCount - 1; i >= 0; i--) {
                if (this.mOrientationHelper.getDecoratedEnd(getChildAt(i)) > limit) {
                    recycleChildren(recycler, childCount - 1, i);
                    return;
                }
            }
            return;
        }
        for (i = 0; i < childCount; i++) {
            if (this.mOrientationHelper.getDecoratedEnd(getChildAt(i)) > limit) {
                recycleChildren(recycler, 0, i);
                return;
            }
        }
    }
}

private void recycleViewsFromEnd(Recycler recycler, int dt) {
    int childCount = getChildCount();
    if (dt >= 0) {
        int limit = this.mOrientationHelper.getEnd() - dt;
        int i;
        if (this.mShouldReverseLayout) {
            for (i = 0; i < childCount; i++) {
                if (this.mOrientationHelper.getDecoratedStart(getChildAt(i)) < limit) {
                    recycleChildren(recycler, 0, i);
                    return;
                }
            }
            return;
        }
        for (i = childCount - 1; i >= 0; i--) {
            if (this.mOrientationHelper.getDecoratedStart(getChildAt(i)) < limit) {
                recycleChildren(recycler, childCount - 1, i);
                return;
            }
        }
    }
}

private int getSpanIndex(SpanSizeLookup spanSizeLookup, int spanCount, RecyclerView.Recycler recycler, RecyclerView.State state, int pos) {
    if (!state.isPreLayout()) {
        return spanSizeLookup.getCachedSpanIndex(pos, spanCount);
    }

    final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition == -1) {
        return 0;
    }
    return spanSizeLookup.getCachedSpanIndex(adapterPosition, spanCount);
}

private int getSpanSize(SpanSizeLookup spanSizeLookup, RecyclerView.Recycler recycler, RecyclerView.State state, int pos) {
    if (!state.isPreLayout()) {
        return spanSizeLookup.getSpanSize(pos);
    }

    final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition == -1) {
        return 0;
    }

    return spanSizeLookup.getSpanSize(adapterPosition);
}

private void assignSpans(GridRangeStyle rangeStyle, RecyclerView.Recycler recycler, RecyclerView.State state, int count,
    int consumedSpanCount, boolean layingOutInPrimaryDirection, LayoutManagerHelper helper) {
    int span, spanDiff, start, end, diff;
    // make sure we traverse from min position to max position
    if (layingOutInPrimaryDirection) {
        start = 0;
        end = count;
        diff = 1;
    } else {
        start = count - 1;
        end = -1;
        diff = -1;
    }

    if (helper.getOrientation() == VERTICAL && helper.isDoLayoutRTL()) { // start from last span
        span = consumedSpanCount - 1;
        spanDiff = -1;
    } else {
        span = 0;
        spanDiff = 1;
    }

    for (int i = start; i != end; i += diff) {
        View view = rangeStyle.mSet[i];
        int spanSize = getSpanSize(rangeStyle.mSpanSizeLookup, recycler, state, helper.getPosition(view));
        if (spanDiff == -1 && spanSize > 1) {
            rangeStyle.mSpanIndices[i] = span - (spanSize - 1);
        } else {
            rangeStyle.mSpanIndices[i] = span;
        }
        span += spanDiff * spanSize;
    }
}

private int getSpanIndex(SpanSizeLookup spanSizeLookup, int spanCount, RecyclerView.Recycler recycler, RecyclerView.State state, int pos) {
    if (!state.isPreLayout()) {
        return spanSizeLookup.getCachedSpanIndex(pos, spanCount);
    }

    final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition == -1) {
        return 0;
    }
    return spanSizeLookup.getCachedSpanIndex(adapterPosition, spanCount);
}

private int getSpanSize(SpanSizeLookup spanSizeLookup, RecyclerView.Recycler recycler, RecyclerView.State state, int pos) {
    if (!state.isPreLayout()) {
        return spanSizeLookup.getSpanSize(pos);
    }

    final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition == -1) {
        return 0;
    }

    return spanSizeLookup.getSpanSize(adapterPosition);
}

private void assignSpans(GridRangeStyle rangeStyle, RecyclerView.Recycler recycler, RecyclerView.State state, int count,
    int consumedSpanCount, boolean layingOutInPrimaryDirection, LayoutManagerHelper helper) {
    int span, spanDiff, start, end, diff;
    // make sure we traverse from min position to max position
    if (layingOutInPrimaryDirection) {
        start = 0;
        end = count;
        diff = 1;
    } else {
        start = count - 1;
        end = -1;
        diff = -1;
    }

    if (helper.getOrientation() == VERTICAL && helper.isDoLayoutRTL()) { // start from last span
        span = consumedSpanCount - 1;
        spanDiff = -1;
    } else {
        span = 0;
        spanDiff = 1;
    }

    for (int i = start; i != end; i += diff) {
        View view = rangeStyle.mSet[i];
        int spanSize = getSpanSize(rangeStyle.mSpanSizeLookup, recycler, state, helper.getPosition(view));
        if (spanDiff == -1 && spanSize > 1) {
            rangeStyle.mSpanIndices[i] = span - (spanSize - 1);
        } else {
            rangeStyle.mSpanIndices[i] = span;
        }
        span += spanDiff * spanSize;
    }
}

private int getSpanIndex(SpanSizeLookup spanSizeLookup, int spanCount, RecyclerView.Recycler recycler, RecyclerView.State state, int pos) {
    if (!state.isPreLayout()) {
        return spanSizeLookup.getCachedSpanIndex(pos, spanCount);
    }

    final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition == -1) {
        return 0;
    }
    return spanSizeLookup.getCachedSpanIndex(adapterPosition, spanCount);
}

private int getSpanSize(SpanSizeLookup spanSizeLookup, RecyclerView.Recycler recycler, RecyclerView.State state, int pos) {
    if (!state.isPreLayout()) {
        return spanSizeLookup.getSpanSize(pos);
    }

    final int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition == -1) {
        return 0;
    }

    return spanSizeLookup.getSpanSize(adapterPosition);
}

private void assignSpans(GridRangeStyle rangeStyle, RecyclerView.Recycler recycler, RecyclerView.State state, int count,
    int consumedSpanCount, boolean layingOutInPrimaryDirection, LayoutManagerHelper helper) {
    int span, spanDiff, start, end, diff;
    // make sure we traverse from min position to max position
    if (layingOutInPrimaryDirection) {
        start = 0;
        end = count;
        diff = 1;
    } else {
        start = count - 1;
        end = -1;
        diff = -1;
    }

    if (helper.getOrientation() == VERTICAL && helper.isDoLayoutRTL()) { // start from last span
        span = consumedSpanCount - 1;
        spanDiff = -1;
    } else {
        span = 0;
        spanDiff = 1;
    }

    for (int i = start; i != end; i += diff) {
        View view = rangeStyle.mSet[i];
        int spanSize = getSpanSize(rangeStyle.mSpanSizeLookup, recycler, state, helper.getPosition(view));
        if (spanDiff == -1 && spanSize > 1) {
            rangeStyle.mSpanIndices[i] = span - (spanSize - 1);
        } else {
            rangeStyle.mSpanIndices[i] = span;
        }
        span += spanDiff * spanSize;
    }
}

@Override
public void layoutViews(RecyclerView.Recycler recycler, RecyclerView.State state,
                        LayoutStateWrapper layoutState, LayoutChunkResult result, LayoutManagerHelper helper) {
    mTempLayoutHelper = helper;

    doLayoutView(recycler, state, layoutState, result, helper);

    mTempLayoutHelper = null;
}

public int getColumnCountForAccessibility(Recycler recycler, State state) {
    if (this.mOrientation == 1) {
        return this.mSpanCount;
    }
    if (state.getItemCount() < 1) {
        return 0;
    }
    return getSpanGroupIndex(recycler, state, state.getItemCount() - 1) + 1;
}

public void onLayoutChildren(Recycler recycler, State state) {
    if (state.isPreLayout()) {
        cachePreLayoutSpanMapping();
    }
    super.onLayoutChildren(recycler, state);
    clearPreLayoutSpanMappingCache();
    if (!state.isPreLayout()) {
        this.mPendingSpanCountChange = false;
    }
}

void onAnchorReady(Recycler recycler, State state, AnchorInfo anchorInfo, int itemDirection) {
    super.onAnchorReady(recycler, state, anchorInfo, itemDirection);
    updateMeasurements();
    if (state.getItemCount() > 0 && !state.isPreLayout()) {
        ensureAnchorIsInCorrectSpan(recycler, state, anchorInfo, itemDirection);
    }
    ensureViewSet();
}

View next(Recycler recycler) {
    if (this.mScrapList != null) {
        return nextViewFromScrapList();
    }
    View view = recycler.getViewForPosition(this.mCurrentPosition);
    this.mCurrentPosition += this.mItemDirection;
    return view;
}

private void recycleChildren(Recycler recycler, int startIndex, int endIndex) {
    if (startIndex != endIndex) {
        int i;
        if (endIndex > startIndex) {
            for (i = endIndex - 1; i >= startIndex; i--) {
                removeAndRecycleViewAt(i, recycler);
            }
            return;
        }
        for (i = startIndex; i > endIndex; i--) {
            removeAndRecycleViewAt(i, recycler);
        }
    }
}

View findReferenceChild(Recycler recycler, State state, int start, int end, int itemCount) {
    ensureLayoutState();
    View invalidMatch = null;
    View outOfBoundsMatch = null;
    int boundsStart = this.mOrientationHelper.getStartAfterPadding();
    int boundsEnd = this.mOrientationHelper.getEndAfterPadding();
    int diff = end > start ? 1 : -1;
    for (int i = start; i != end; i += diff) {
        View childAt = getChildAt(i);
        int position = getPosition(childAt);
        if (position >= 0 && position < itemCount && getSpanIndex(recycler, state, position) == 0) {
            if (((android.support.v7.widget.RecyclerView.LayoutParams) childAt.getLayoutParams()).isItemRemoved()) {
                if (invalidMatch == null) {
                    invalidMatch = childAt;
                }
            } else if (this.mOrientationHelper.getDecoratedStart(childAt) < boundsEnd && this.mOrientationHelper.getDecoratedEnd(childAt) >= boundsStart) {
                return childAt;
            } else {
                if (outOfBoundsMatch == null) {
                    outOfBoundsMatch = childAt;
                }
            }
        }
    }
    if (outOfBoundsMatch == null) {
        outOfBoundsMatch = invalidMatch;
    }
    return outOfBoundsMatch;
}

private int getSpanGroupIndex(Recycler recycler, State state, int viewPosition) {
    if (!state.isPreLayout()) {
        return this.mSpanSizeLookup.getSpanGroupIndex(viewPosition, this.mSpanCount);
    }
    int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(viewPosition);
    if (adapterPosition != -1) {
        return this.mSpanSizeLookup.getSpanGroupIndex(adapterPosition, this.mSpanCount);
    }
    Log.w(TAG, "Cannot find span size for pre layout position. " + viewPosition);
    return 0;
}

private int getSpanIndex(Recycler recycler, State state, int pos) {
    if (!state.isPreLayout()) {
        return this.mSpanSizeLookup.getCachedSpanIndex(pos, this.mSpanCount);
    }
    int cached = this.mPreLayoutSpanIndexCache.get(pos, -1);
    if (cached != -1) {
        return cached;
    }
    int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition != -1) {
        return this.mSpanSizeLookup.getCachedSpanIndex(adapterPosition, this.mSpanCount);
    }
    Log.w(TAG, "Cannot find span size for pre layout position. It is not cached, not in the adapter. Pos:" + pos);
    return 0;
}

private int getSpanSize(Recycler recycler, State state, int pos) {
    if (!state.isPreLayout()) {
        return this.mSpanSizeLookup.getSpanSize(pos);
    }
    int cached = this.mPreLayoutSpanSizeCache.get(pos, -1);
    if (cached != -1) {
        return cached;
    }
    int adapterPosition = recycler.convertPreLayoutPositionToPostLayout(pos);
    if (adapterPosition != -1) {
        return this.mSpanSizeLookup.getSpanSize(adapterPosition);
    }
    Log.w(TAG, "Cannot find span size for pre layout position. It is not cached, not in the adapter. Pos:" + pos);
    return 1;
}

private void assignSpans(Recycler recycler, State state, int count, int consumedSpanCount, boolean layingOutInPrimaryDirection) {
    int start;
    int end;
    int diff;
    int span;
    int spanDiff;
    if (layingOutInPrimaryDirection) {
        start = 0;
        end = count;
        diff = 1;
    } else {
        start = count - 1;
        end = -1;
        diff = -1;
    }
    if (this.mOrientation == 1 && isLayoutRTL()) {
        span = this.mSpanCount - 1;
        spanDiff = -1;
    } else {
        span = 0;
        spanDiff = 1;
    }
    for (int i = start; i != end; i += diff) {
        View view = this.mSet[i];
        LayoutParams params = (LayoutParams) view.getLayoutParams();
        params.mSpanSize = getSpanSize(recycler, state, getPosition(view));
        if (spanDiff != -1 || params.mSpanSize <= 1) {
            params.mSpanIndex = span;
        } else {
            params.mSpanIndex = span - (params.mSpanSize - 1);
        }
        span += params.mSpanSize * spanDiff;
    }
}

void layoutChunk(Recycler recycler, State state, LayoutState layoutState, LayoutChunkResult result) {
    View view = layoutState.next(recycler);
    if (view == null) {
        result.mFinished = true;
        return;
    }
    int right;
    int left;
    int bottom;
    int top;
    LayoutParams params = (LayoutParams) view.getLayoutParams();
    if (layoutState.mScrapList == null) {
        if (this.mShouldReverseLayout == (layoutState.mLayoutDirection == -1)) {
            addView(view);
        } else {
            addView(view, 0);
        }
    } else {
        if (this.mShouldReverseLayout == (layoutState.mLayoutDirection == -1)) {
            addDisappearingView(view);
        } else {
            addDisappearingView(view, 0);
        }
    }
    measureChildWithMargins(view, 0, 0);
    result.mConsumed = this.mOrientationHelper.getDecoratedMeasurement(view);
    if (this.mOrientation == 1) {
        if (isLayoutRTL()) {
            right = getWidth() - getPaddingRight();
            left = right - this.mOrientationHelper.getDecoratedMeasurementInOther(view);
        } else {
            left = getPaddingLeft();
            right = left + this.mOrientationHelper.getDecoratedMeasurementInOther(view);
        }
        if (layoutState.mLayoutDirection == -1) {
            bottom = layoutState.mOffset;
            top = layoutState.mOffset - result.mConsumed;
        } else {
            top = layoutState.mOffset;
            bottom = layoutState.mOffset + result.mConsumed;
        }
    } else {
        top = getPaddingTop();
        bottom = top + this.mOrientationHelper.getDecoratedMeasurementInOther(view);
        if (layoutState.mLayoutDirection == -1) {
            right = layoutState.mOffset;
            left = layoutState.mOffset - result.mConsumed;
        } else {
            left = layoutState.mOffset;
            right = layoutState.mOffset + result.mConsumed;
        }
    }
    layoutDecorated(view, left + params.leftMargin, top + params.topMargin, right - params.rightMargin, bottom - params.bottomMargin);
    if (params.isItemRemoved() || params.isItemChanged()) {
        result.mIgnoreConsumed = true;
    }
    result.mFocusable = view.isFocusable();
}

View findReferenceChild(Recycler recycler, State state, int start, int end, int itemCount) {
    ensureLayoutState();
    View invalidMatch = null;
    View outOfBoundsMatch = null;
    int boundsStart = this.mOrientationHelper.getStartAfterPadding();
    int boundsEnd = this.mOrientationHelper.getEndAfterPadding();
    int diff = end > start ? 1 : -1;
    for (int i = start; i != end; i += diff) {
        View childAt = getChildAt(i);
        int position = getPosition(childAt);
        if (position >= 0 && position < itemCount) {
            if (((LayoutParams) childAt.getLayoutParams()).isItemRemoved()) {
                if (invalidMatch == null) {
                    invalidMatch = childAt;
                }
            } else if (this.mOrientationHelper.getDecoratedStart(childAt) < boundsEnd && this.mOrientationHelper.getDecoratedEnd(childAt) >= boundsStart) {
                return childAt;
            } else {
                if (outOfBoundsMatch == null) {
                    outOfBoundsMatch = childAt;
                }
            }
        }
    }
    if (outOfBoundsMatch == null) {
        outOfBoundsMatch = invalidMatch;
    }
    return outOfBoundsMatch;
}

public void onInitializeAccessibilityNodeInfoForItem(Recycler recycler, State state, View host, AccessibilityNodeInfoCompat info) {
    android.view.ViewGroup.LayoutParams lp = host.getLayoutParams();
    if (lp instanceof LayoutParams) {
        LayoutParams sglp = (LayoutParams) lp;
        if (this.mOrientation == 0) {
            info.setCollectionItemInfo(CollectionItemInfoCompat.obtain(sglp.getSpanIndex(), sglp.mFullSpan ? this.mSpanCount : 1, -1, -1, sglp.mFullSpan, false));
            return;
        } else {
            info.setCollectionItemInfo(CollectionItemInfoCompat.obtain(-1, -1, sglp.getSpanIndex(), sglp.mFullSpan ? this.mSpanCount : 1, sglp.mFullSpan, false));
            return;
        }
    }
    super.onInitializeAccessibilityNodeInfoForItem(host, info);
}

private void recycle(Recycler recycler, LayoutState layoutState) {
    if (layoutState.mRecycle && !layoutState.mInfinite) {
        if (layoutState.mAvailable == 0) {
            if (layoutState.mLayoutDirection == -1) {
                recycleFromEnd(recycler, layoutState.mEndLine);
            } else {
                recycleFromStart(recycler, layoutState.mStartLine);
            }
        } else if (layoutState.mLayoutDirection == -1) {
            scrolled = layoutState.mStartLine - getMaxStart(layoutState.mStartLine);
            if (scrolled < 0) {
                line = layoutState.mEndLine;
            } else {
                line = layoutState.mEndLine - Math.min(scrolled, layoutState.mAvailable);
            }
            recycleFromEnd(recycler, line);
        } else {
            scrolled = getMinEnd(layoutState.mEndLine) - layoutState.mEndLine;
            if (scrolled < 0) {
                line = layoutState.mStartLine;
            } else {
                line = layoutState.mStartLine + Math.min(scrolled, layoutState.mAvailable);
            }
            recycleFromStart(recycler, line);
        }
    }
}

private void recycleFromStart(Recycler recycler, int line) {
    while (getChildCount() > 0) {
        View child = getChildAt(0);
        if (this.mPrimaryOrientation.getDecoratedEnd(child) <= line) {
            LayoutParams lp = (LayoutParams) child.getLayoutParams();
            if (lp.mFullSpan) {
                int j = 0;
                while (j < this.mSpanCount) {
                    if (this.mSpans[j].mViews.size() != 1) {
                        j++;
                    } else {
                        return;
                    }
                }
                for (j = 0; j < this.mSpanCount; j++) {
                    this.mSpans[j].popStart();
                }
            } else if (lp.mSpan.mViews.size() != 1) {
                lp.mSpan.popStart();
            } else {
                return;
            }
            removeAndRecycleView(child, recycler);
        } else {
            return;
        }
    }
}

private void recycleFromEnd(Recycler recycler, int line) {
    int i = getChildCount() - 1;
    while (i >= 0) {
        View child = getChildAt(i);
        if (this.mPrimaryOrientation.getDecoratedStart(child) >= line) {
            LayoutParams lp = (LayoutParams) child.getLayoutParams();
            if (lp.mFullSpan) {
                int j = 0;
                while (j < this.mSpanCount) {
                    if (this.mSpans[j].mViews.size() != 1) {
                        j++;
                    } else {
                        return;
                    }
                }
                for (j = 0; j < this.mSpanCount; j++) {
                    this.mSpans[j].popEnd();
                }
            } else if (lp.mSpan.mViews.size() != 1) {
                lp.mSpan.popEnd();
            } else {
                return;
            }
            removeAndRecycleView(child, recycler);
            i--;
        } else {
            return;
        }
    }
}

int scrollBy(int dt, Recycler recycler, State state) {
    int layoutDir;
    int referenceChildPosition;
    int totalScroll;
    ensureOrientationHelper();
    if (dt > 0) {
        layoutDir = 1;
        referenceChildPosition = getLastChildPosition();
    } else {
        layoutDir = -1;
        referenceChildPosition = getFirstChildPosition();
    }
    this.mLayoutState.mRecycle = true;
    updateLayoutState(referenceChildPosition, state);
    setLayoutStateDirection(layoutDir);
    this.mLayoutState.mCurrentPosition = this.mLayoutState.mItemDirection + referenceChildPosition;
    int absDt = Math.abs(dt);
    this.mLayoutState.mAvailable = absDt;
    int consumed = fill(recycler, this.mLayoutState, state);
    if (absDt < consumed) {
        totalScroll = dt;
    } else if (dt < 0) {
        totalScroll = -consumed;
    } else {
        totalScroll = consumed;
    }
    this.mPrimaryOrientation.offsetChildren(-totalScroll);
    this.mLastLayoutFromEnd = this.mShouldReverseLayout;
    return totalScroll;
}

View next(Recycler recycler) {
    if (this.mScrapList != null) {
        return nextViewFromScrapList();
    }
    View view = recycler.getViewForPosition(this.mCurrentPosition);
    this.mCurrentPosition += this.mItemDirection;
    return view;
}

public void onDetachedFromWindow(RecyclerView view, Recycler recycler) {
    super.onDetachedFromWindow(view, recycler);
    if (this.mRecycleChildrenOnDetach) {
        removeAndRecycleAllViews(recycler);
        recycler.clear();
    }
}

int fill(Recycler recycler, LayoutState layoutState, State state, boolean stopOnFocusable) {
    int start = layoutState.mAvailable;
    if (layoutState.mScrollingOffset != Integer.MIN_VALUE) {
        if (layoutState.mAvailable < 0) {
            layoutState.mScrollingOffset += layoutState.mAvailable;
        }
        recycleByLayoutState(recycler, layoutState);
    }
    int remainingSpace = layoutState.mAvailable + layoutState.mExtra;
    LayoutChunkResult layoutChunkResult = new LayoutChunkResult();
    while (true) {
        if ((!layoutState.mInfinite && remainingSpace <= 0) || !layoutState.hasMore(state)) {
            break;
        }
        layoutChunkResult.resetInternal();
        layoutChunk(recycler, state, layoutState, layoutChunkResult);
        if (!layoutChunkResult.mFinished) {
            layoutState.mOffset += layoutChunkResult.mConsumed * layoutState.mLayoutDirection;
            if (!(layoutChunkResult.mIgnoreConsumed && this.mLayoutState.mScrapList == null && state.isPreLayout())) {
                layoutState.mAvailable -= layoutChunkResult.mConsumed;
                remainingSpace -= layoutChunkResult.mConsumed;
            }
            if (layoutState.mScrollingOffset != Integer.MIN_VALUE) {
                layoutState.mScrollingOffset += layoutChunkResult.mConsumed;
                if (layoutState.mAvailable < 0) {
                    layoutState.mScrollingOffset += layoutState.mAvailable;
                }
                recycleByLayoutState(recycler, layoutState);
            }
            if (stopOnFocusable && layoutChunkResult.mFocusable) {
                break;
            }
        } else {
            break;
        }
    }
    return start - layoutState.mAvailable;
}

private void layoutForPredictiveAnimations(Recycler recycler, State state, int startOffset, int endOffset) {
    if (state.willRunPredictiveAnimations() && getChildCount() != 0 && !state.isPreLayout() && supportsPredictiveItemAnimations()) {
        int scrapExtraStart = 0;
        int scrapExtraEnd = 0;
        List<ViewHolder> scrapList = recycler.getScrapList();
        int scrapSize = scrapList.size();
        int firstChildPos = getPosition(getChildAt(0));
        for (int i = 0; i < scrapSize; i++) {
            ViewHolder scrap = (ViewHolder) scrapList.get(i);
            if (!scrap.isRemoved()) {
                if (((scrap.getLayoutPosition() < firstChildPos) != this.mShouldReverseLayout ? -1 : 1) == -1) {
                    scrapExtraStart += this.mOrientationHelper.getDecoratedMeasurement(scrap.itemView);
                } else {
                    scrapExtraEnd += this.mOrientationHelper.getDecoratedMeasurement(scrap.itemView);
                }
            }
        }
        this.mLayoutState.mScrapList = scrapList;
        if (scrapExtraStart > 0) {
            updateLayoutStateToFillStart(getPosition(getChildClosestToStart()), startOffset);
            this.mLayoutState.mExtra = scrapExtraStart;
            this.mLayoutState.mAvailable = 0;
            this.mLayoutState.assignPositionFromScrapList();
            fill(recycler, this.mLayoutState, state, false);
        }
        if (scrapExtraEnd > 0) {
            updateLayoutStateToFillEnd(getPosition(getChildClosestToEnd()), endOffset);
            this.mLayoutState.mExtra = scrapExtraEnd;
            this.mLayoutState.mAvailable = 0;
            this.mLayoutState.assignPositionFromScrapList();
            fill(recycler, this.mLayoutState, state, false);
        }
        this.mLayoutState.mScrapList = null;
    }
}