/**
* Copyright (C) 2016 eBusiness Information
*
* This file is part of OSM Contributor.
*
* OSM Contributor is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* OSM Contributor is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OSM Contributor. If not, see <http://www.gnu.org/licenses/>.
*/
package io.jawg.osmcontributor.utils.helper;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
public class DragSwipeItemTouchHelperCallback extends ItemTouchHelper.Callback {
private final DragSwipeItemTouchHelperAdapter adapter;
private Integer fromPosition = null;
private Integer toPosition = null;
public DragSwipeItemTouchHelperCallback(DragSwipeItemTouchHelperAdapter adapter) {
this.adapter = adapter;
}
@Override
public boolean isLongPressDragEnabled() {
return false;
}
@Override
public boolean isItemViewSwipeEnabled() {
return true;
}
@Override
public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
final int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
return makeMovementFlags(dragFlags, swipeFlags);
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
if (source.getItemViewType() != target.getItemViewType()) {
return false;
}
// remember FIRST from position
if (fromPosition == null) {
fromPosition = source.getAdapterPosition();
}
toPosition = target.getAdapterPosition();
// Notify the adapter of the move
adapter.onItemMove(source.getAdapterPosition(), target.getAdapterPosition());
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
adapter.onItemDismiss(viewHolder.getAdapterPosition());
}
@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
itemViewHolder.onItemSelected();
}
super.onSelectedChanged(viewHolder, actionState);
}
@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);
ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
itemViewHolder.onItemClear();
if (fromPosition != null && toPosition != null) {
adapter.onItemDrop(fromPosition, toPosition);
}
// clear saved positions
fromPosition = null;
toPosition = null;
}
}