Java CustomRecyclerViewUtils.LAYOUT_TYPE_LINEAR_HORIZONTAL屬性代碼示例

@SuppressWarnings("unchecked")
private void startDragging(RecyclerView rv, MotionEvent e, RecyclerView.ViewHolder holder, ItemDraggableRange range) {
    safeEndAnimation(rv, holder);

    mHandler.cancelLongPressDetection();

    mDraggingItemInfo = new DraggingItemInfo(holder, mLastTouchX, mLastTouchY);
    mDraggingItemViewHolder = holder;

    // XXX if setIsRecyclable() is used, another view holder objects will be created
    // which has the same ID with currently dragging item... Not works as expected.

    // holder.setIsRecyclable(false);

    mDraggableRange = range;

    mOrigOverScrollMode = ViewCompat.getOverScrollMode(rv);
    ViewCompat.setOverScrollMode(rv, ViewCompat.OVER_SCROLL_NEVER);

    mLastTouchX = (int) (e.getX() + 0.5f);
    mLastTouchY = (int) (e.getY() + 0.5f);

    // disable auto scrolling until user moves the item
    mDragStartTouchY = mDragMinTouchY = mDragMaxTouchY = mLastTouchY;
    mDragStartTouchX = mDragMinTouchX = mDragMaxTouchX = mLastTouchX;
    mScrollDirMask = SCROLL_DIR_NONE;

    mRecyclerView.getParent().requestDisallowInterceptTouchEvent(true);

    startScrollOnDraggingProcess();

    // raise onDragItemStarted() event
    mAdapter.onDragItemStarted(mDraggingItemInfo, holder, mDraggableRange);

    // setup decorators
    mAdapter.onBindViewHolder(holder, holder.getLayoutPosition());

    mDraggingItemDecorator = new DraggingItemDecorator(mRecyclerView, holder, mDraggableRange);
    mDraggingItemDecorator.setShadowDrawable(mShadowDrawable);
    mDraggingItemDecorator.start(e, mDraggingItemInfo);

    int layoutType = CustomRecyclerViewUtils.getLayoutType(mRecyclerView);

    if (supportsViewTranslation() &&
            (layoutType == CustomRecyclerViewUtils.LAYOUT_TYPE_LINEAR_VERTICAL ||
                    layoutType == CustomRecyclerViewUtils.LAYOUT_TYPE_LINEAR_HORIZONTAL)) {
        mSwapTargetItemOperator = new SwapTargetItemOperator(mRecyclerView, holder, mDraggableRange, mDraggingItemInfo);
        mSwapTargetItemOperator.setSwapTargetTranslationInterpolator(mSwapTargetTranslationInterpolator);
        mSwapTargetItemOperator.start();
        mSwapTargetItemOperator.update(mDraggingItemDecorator.getDraggingItemTranslationX(), mDraggingItemDecorator.getDraggingItemTranslationY());
    }

    if (mEdgeEffectDecorator != null) {
        mEdgeEffectDecorator.reorderToTop();
    }

    if (mItemDragEventListener != null) {
        mItemDragEventListener.onItemDragStarted(mAdapter.getDraggingItemInitialPosition());
    }
}
 

static RecyclerView.ViewHolder findSwapTargetItem(
        RecyclerView rv, RecyclerView.ViewHolder draggingItem,
        DraggingItemInfo draggingItemInfo, int overlayItemLeft, int overlayItemTop, ItemDraggableRange range) {
    RecyclerView.ViewHolder swapTargetHolder = null;

    if ((draggingItem == null) || (
            draggingItem.getAdapterPosition() != RecyclerView.NO_POSITION &&
                    draggingItem.getItemId() == draggingItemInfo.id)) {

        final int layoutType = CustomRecyclerViewUtils.getLayoutType(rv);
        final boolean isVerticalLayout =
                (CustomRecyclerViewUtils.extractOrientation(layoutType) == CustomRecyclerViewUtils.ORIENTATION_VERTICAL);

        if (isVerticalLayout) {
            overlayItemLeft = Math.max(overlayItemLeft, rv.getPaddingLeft());
            overlayItemLeft = Math.min(overlayItemLeft, Math.max(0, rv.getWidth() - rv.getPaddingRight() - draggingItemInfo.width));
        } else {
            overlayItemTop = Math.max(overlayItemTop, rv.getPaddingTop());
            overlayItemTop = Math.min(overlayItemTop, Math.max(0, rv.getHeight() - rv.getPaddingBottom() - draggingItemInfo.height));
        }

        switch (layoutType) {
            case CustomRecyclerViewUtils.LAYOUT_TYPE_GRID_HORIZONTAL:
            case CustomRecyclerViewUtils.LAYOUT_TYPE_GRID_VERTICAL:
                swapTargetHolder = findSwapTargetItemForGridLayoutManager(
                        rv, draggingItem, draggingItemInfo, overlayItemLeft, overlayItemTop, range, isVerticalLayout);
                break;
            case CustomRecyclerViewUtils.LAYOUT_TYPE_LINEAR_HORIZONTAL:
                swapTargetHolder = findSwapTargetItemForLinearLayoutManagerHorizontal(rv, draggingItem, draggingItemInfo, overlayItemLeft, overlayItemTop, range);
                break;
            case CustomRecyclerViewUtils.LAYOUT_TYPE_LINEAR_VERTICAL:
                swapTargetHolder = findSwapTargetItemForLinearLayoutManagerVertical(rv, draggingItem, draggingItemInfo, overlayItemLeft, overlayItemTop, range);
                break;
            default:
                break;
        }
    }

    // check range
    if (swapTargetHolder != null && range != null) {
        if (!range.checkInRange(swapTargetHolder.getAdapterPosition())) {
            swapTargetHolder = null;
        }
    }

    return swapTargetHolder;
}