Examples with LVRefreshRecyclerView com.taobao.luaview.view.LVRefreshRecyclerView used on opensource projects

Example 1 with LVRefreshRecyclerView

use of com.taobao.luaview.view.LVRefreshRecyclerView in project LuaViewSDK by alibaba.

the class UDBaseRecyclerView method pinned.

// TODO: 11/15/16 处理itemView之前有spacing的情况
private void pinned(LVRecyclerView lvRecyclerView) {
    if (!mHasPinnedCell)
        return;
    if (mPinnedContainer == null) {
        mPinnedContainer = new FrameLayout(lvRecyclerView.getContext());
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        ViewGroup parent = (ViewGroup) lvRecyclerView.getParent();
        if (parent instanceof LVRefreshRecyclerView) {
            // RefreshCollectionView
            params.leftMargin = (int) parent.getX();
            params.topMargin = (int) parent.getY();
            ((ViewGroup) parent.getParent()).addView(mPinnedContainer, params);
        } else {
            // CollectionView
            params.leftMargin = (int) lvRecyclerView.getX();
            params.topMargin = (int) lvRecyclerView.getY();
            parent.addView(mPinnedContainer, params);
        }
    }
    int firstVisiblePosition = findFirstVisiblePosition(lvRecyclerView.getLayoutManager());
    // 从firstVisiblePosition位置开始递减查找上一个pinned position
    int pinnedViewPosition = findPinnedViewPositionDecrease(firstVisiblePosition);
    if (pinnedViewPosition >= 0 && mCurrentPinnedPosition != pinnedViewPosition) {
        ViewGroup itemView = (ViewGroup) mPinnedPositionHolder.get(pinnedViewPosition).itemView;
        View child = itemView.getChildAt(0);
        if (child != null) {
            // 从itemView移除child之前,先设置其与child一样的宽高占位。
            itemView.getLayoutParams().width = child.getLayoutParams().width;
            itemView.getLayoutParams().height = child.getLayoutParams().height;
            itemView.removeView(child);
            mPinnedContainer.addView(child);
            if (mCurrentPinnedView != null) {
                mCurrentPinnedView.setVisibility(View.GONE);
            }
            mCurrentPinnedView = child;
        } else {
            // 从(pinnedViewPosition + 1)位置开始递增查找下一个pinned position
            int nextPinnedPosition = findPinnedViewPositionIncrease(pinnedViewPosition + 1);
            ViewGroup parentItemView = (ViewGroup) mPinnedPositionHolder.get(nextPinnedPosition).itemView;
            View pinnedView = mPinnedContainer.getChildAt(mPinnedContainer.getChildCount() - 1);
            mPinnedContainer.removeView(pinnedView);
            parentItemView.addView(pinnedView);
            mCurrentPinnedView = mPinnedContainer.getChildAt(mPinnedContainer.getChildCount() - 1);
            mCurrentPinnedView.setVisibility(View.VISIBLE);
        }
        mCurrentPinnedPosition = pinnedViewPosition;
    }
    // 第一个吸顶视图被移除的情况,亦即列表恢复没有吸顶视图的状态。
    if (pinnedViewPosition == -1 && mCurrentPinnedPosition != -1) {
        View subview = mPinnedContainer.getChildAt(mPinnedContainer.getChildCount() - 1);
        mPinnedContainer.removeView(subview);
        // 从position 0开始找第一个pinned标记的itemView,并把最后一个吸顶视图添加回到它的原本位置
        int firstPinnedPosition = findPinnedViewPositionIncrease(0);
        ViewGroup parentItemView = (ViewGroup) mPinnedPositionHolder.get(firstPinnedPosition).itemView;
        parentItemView.addView(subview);
        // 列表恢复没有吸顶视图的状态
        mCurrentPinnedPosition = -1;
        mCurrentPinnedView = null;
    }
    // 处理吸顶视图切换时的位移效果
    if (mPinnedContainer != null && mCurrentPinnedPosition != -1) {
        View targetView = lvRecyclerView.findChildViewUnder(mPinnedContainer.getMeasuredWidth() / 2, mPinnedContainer.getMeasuredHeight() + 1);
        if (targetView != null) {
            boolean isPinned = ((Boolean) targetView.getTag(Constants.RES_LV_TAG_PINNED)).booleanValue();
            if (isPinned && targetView.getTop() > 0) {
                if (pinnedViewPosition != -1) {
                    int deltaY = targetView.getTop() - mPinnedContainer.getMeasuredHeight();
                    if (deltaY < (lvRecyclerView.getMiniSpacing() - mPinnedContainer.getMeasuredHeight())) {
                        // 防止设置了spacing的时候,在这个范围内mPinnedContainer被位移到top之上,而itemView是空白的现象
                        mPinnedContainer.setTranslationY(0);
                    } else {
                        mPinnedContainer.setTranslationY(deltaY);
                    }
                }
            } else {
                mPinnedContainer.setTranslationY(0);
            }
        } else {
            mPinnedContainer.setTranslationY(0);
        }
    }
}