+
+ NewTransactionItemsAdapter adapter = this;
+
+ touchHelper = new ItemTouchHelper(new ItemTouchHelper.Callback() {
+ @Override
+ public boolean isLongPressDragEnabled() {
+ return true;
+ }
+ @Override
+ public boolean canDropOver(@NonNull RecyclerView recyclerView,
+ @NonNull RecyclerView.ViewHolder current,
+ @NonNull RecyclerView.ViewHolder target) {
+ final int adapterPosition = target.getAdapterPosition();
+
+ // first and last items are immovable
+ if (adapterPosition == 0)
+ return false;
+ if (adapterPosition == adapter.getItemCount() - 1)
+ return false;
+
+ return super.canDropOver(recyclerView, current, target);
+ }
+ @Override
+ public int getMovementFlags(@NonNull RecyclerView recyclerView,
+ @NonNull RecyclerView.ViewHolder viewHolder) {
+ int flags = makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.END);
+ // the top item is always there (date and description)
+ if (viewHolder.getAdapterPosition() > 0) {
+ flags |= makeFlag(ItemTouchHelper.ACTION_STATE_DRAG,
+ ItemTouchHelper.UP | ItemTouchHelper.DOWN);
+
+ if (viewModel.getAccountCount() > 2) {
+ flags |= makeFlag(ItemTouchHelper.ACTION_STATE_SWIPE,
+ ItemTouchHelper.START | ItemTouchHelper.END);
+ }
+ }
+
+ return flags;
+ }
+ @Override
+ public boolean onMove(@NonNull RecyclerView recyclerView,
+ @NonNull RecyclerView.ViewHolder viewHolder,
+ @NonNull RecyclerView.ViewHolder target) {
+
+ model.swapItems(viewHolder.getAdapterPosition(), target.getAdapterPosition());
+ notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition());
+ return true;
+ }
+ @Override
+ public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
+ if (viewModel.getAccountCount() == 2)
+ Snackbar.make(recyclerView, R.string.msg_at_least_two_accounts_are_required,
+ Snackbar.LENGTH_LONG)
+ .setAction("Action", null)
+ .show();
+ else {
+ int pos = viewHolder.getAdapterPosition();
+ viewModel.removeItem(pos - 1);
+ notifyItemRemoved(pos);
+ viewModel.sendCountNotifications(); // needed after items re-arrangement
+ viewModel.checkTransactionSubmittable(adapter);
+ }
+ }
+ });