com.ericharlow.dnd.DragNDropAdapter.java Source code

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Here is the source code for com.ericharlow.dnd.DragNDropAdapter.java

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/*
 * Copyright (C) 2010 Eric Harlow
 *
 * 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.ericharlow.dnd;

import java.util.List;

import roboguice.util.Ln;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;

import com.google.common.collect.Lists;
import com.kentchiu.dictiondroid.R;
import com.kentchiu.dictiondroid.domain.Dictionary;
import com.kentchiu.dictiondroid.domain.IDictionaryService;

public final class DragNDropAdapter extends BaseAdapter implements RemoveListener, DropListener {

    static class ViewHolder {
        TextView text;
        CheckBox checkBox;
    }

    private int[] mLayouts;
    private LayoutInflater mInflater;
    private List<Dictionary> mContent;

    public DragNDropAdapter(Context context, int[] itemLayouts, IDictionaryService service) {
        init(context, itemLayouts, Lists.newLinkedList(service.allDictionaries()));
    }

    public List<Dictionary> getContent() {
        return mContent;
    }

    /**
     * The number of items in the list
     * @see android.widget.ListAdapter#getCount()
     */
    @Override
    public int getCount() {
        return mContent.size();
    }

    /**
     * Since the data comes from an array, just returning the index is
     * sufficient to get at the data. If we were using a more complex data
     * structure, we would return whatever object represents one row in the
     * list.
     *
     * @see android.widget.ListAdapter#getItem(int)
     */
    @Override
    public Dictionary getItem(int position) {
        return mContent.get(position);
    }

    /**
     * Use the array index as a unique id.
     * @see android.widget.ListAdapter#getItemId(int)
     */
    @Override
    public long getItemId(int position) {
        return position;
    }

    /**
     * Make a view to hold each row.
     *
     * @see android.widget.ListAdapter#getView(int, android.view.View,
     *      android.view.ViewGroup)
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        final int idx = position;
        if (convertView == null) {
            convertView = mInflater.inflate(mLayouts[0], null);

            holder = new ViewHolder();
            holder.text = (TextView) convertView.findViewById(R.id.TextView01);
            holder.checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);
            holder.checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    Dictionary dict = mContent.get(idx);
                    dict.setEnabled(isChecked);
                    if (dict.isEnabled()) {
                        Ln.v("dict %s is enabled", dict.getName());
                    } else {
                        Ln.v("dict %s is disabled", dict.getName());
                    }
                }
            });
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        // Bind the data efficiently with the holder.
        Dictionary dict = mContent.get(position);
        String name = dict.getName();
        holder.text.setText(name);
        holder.checkBox.setChecked(dict.isEnabled());
        return convertView;
    }

    @Override
    public void onDrop(int from, int to) {
        Dictionary temp = mContent.get(from);
        mContent.remove(from);
        mContent.add(to, temp);
    }

    @Override
    public void onRemove(int which) {
        if (which < 0 || which > mContent.size()) {
            return;
        }
        mContent.remove(which);
    }

    private void init(Context context, int[] layouts, List<Dictionary> content) {
        mInflater = LayoutInflater.from(context);
        mLayouts = layouts;
        mContent = content;
    }
}