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DraggableItemAdapter.java
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DraggableItemAdapter.java
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/*
* Copyright (C) 2015 Haruki Hasegawa
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.h6ah4i.android.widget.advrecyclerview.draggable;
import android.support.v7.widget.RecyclerView;
public interface DraggableItemAdapter<T extends RecyclerView.ViewHolder> {
/**
* Called when user is attempt to drag the item.
*
* @param holder The ViewHolder which is associated to item user is attempt to start dragging.
* @param position The position of the item within the adapter's data set.
* @param x Touched X position. Relative from the itemView's top-left.
* @param y Touched Y position. Relative from the itemView's top-left.
* @return Whether can start dragging.
*/
boolean onCheckCanStartDrag(T holder, int position, int x, int y);
/**
* Called after the {@link #onCheckCanStartDrag(android.support.v7.widget.RecyclerView.ViewHolder, int, int, int)} method returned true.
*
* @param holder The ViewHolder which is associated to item user is attempt to start dragging.
* @param position The position of the item within the adapter's data set.
*
* @return null: no constraints (= new ItemDraggableRange(0, getItemCount() - 1)),
* otherwise: the range specified item can be drag-sortable.
*/
ItemDraggableRange onGetItemDraggableRange(T holder, int position);
/**
* Called when item is moved. Should apply the move operation result to data set.
*
* @param fromPosition Previous position of the item.
* @param toPosition New position of the item.
*/
void onMoveItem(int fromPosition, int toPosition);
}