@param position the index of the item in the adapter @return the accurate left position for the given item

the magic function :).all the work including computing ,recycling,and layout is done here @param recycler ...

precise math method

should recycle view with the given dy or say check if the view is out of the bound after the dy is applied @param view .. @param dy .. @return ..

@param position .. @param currPos .. @param tail .. change @param x .. @return the left position for given item

we need to set scrollstate to {@link RecyclerView#SCROLL_STATE_IDLE} idle stop RV from intercepting the touch event which block the item click

@param itemView the new item in the base position @param position the item's position in list