Android Open Source - DragNDropList Drag N Drop Cursor Adapter

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Terlici Ltd./* w  ww  .ja v a  2s.  c  o m*/
 *
 * 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.terlici.dragndroplist;

import android.content.Context;
import android.database.Cursor;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.View;
import android.view.ViewGroup;

public class DragNDropCursorAdapter extends SimpleCursorAdapter implements DragNDropAdapter {
  int mPosition[];
  int mHandler;
  
  public DragNDropCursorAdapter(Context context, int layout, Cursor cursor, String[] from, int[] to, int handler) {
    super(context, layout, cursor, from, to, 0);
    
    mHandler = handler;
    setup();
  }
  
  @Override
  public Cursor swapCursor(Cursor c) {
    Cursor cursor = super.swapCursor(c);
    
    mPosition = null;
    setup();
    
    return cursor;
  }
  
  private void setup() {
    Cursor c = getCursor();
    
    if (c == null || !c.moveToFirst()) return;
    
    mPosition = new int[c.getCount()];
    
    for (int i = 0; i < mPosition.length; ++i) mPosition[i] = i;
  }
  
  @Override
  public View getDropDownView(int position, View view, ViewGroup group) {
    return super.getDropDownView(mPosition[position], view, group);
  }
  
  @Override
  public Object getItem(int position) {
    return super.getItem(mPosition[position]);
  }
  
  @Override
  public int getItemViewType(int position) {
    return super.getItemViewType(mPosition[position]);
  }
  
  @Override
  public long getItemId(int position) {
    return super.getItemId(mPosition[position]);
  }
  
  @Override
  public View getView(int position, View view, ViewGroup group) {
    return super.getView(mPosition[position], view, group);
  }
  
  @Override
  public boolean isEnabled(int position) {
    return super.isEnabled(mPosition[position]);
  }

  @Override
  public void onItemDrag(DragNDropListView parent, View view, int position, long id) {
    
  }

  @Override
  public void onItemDrop(DragNDropListView parent, View view, int startPosition, int endPosition, long id) {
    int position = mPosition[startPosition];
    
    if (startPosition < endPosition)
      for(int i = startPosition; i < endPosition; ++i)
        mPosition[i] = mPosition[i + 1];
    else if (endPosition < startPosition)
      for(int i = startPosition; i > endPosition; --i)
        mPosition[i] = mPosition[i - 1];
    
    mPosition[endPosition] = position;
  }

  @Override
  public int getDragHandler() {
    return mHandler;
  }
  
}

Java Source Code List

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