TagListView.java :  » Client » locastmobile » edu » mit » mel » locast » mobile » widget » Android Open Source

package edu.mit.mel.locast.mobile.widget;
/*
 * Copyright (C) 2010  MIT Mobile Experience Lab
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Vector;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import edu.mit.mel.locast.mobile.R;

public class TagListView extends LinearLayout {

  private final ViewGroup addedTagView;
  private final List<String> addedTags = new Vector<String>();
  private OnClickListener tagHandler;
  private final TextView noTagNotice;

  public TagListView(Context context) {
    this(context, null);
  }

  public void clearAllTags(){
    addedTags.clear();
    addedTagView.removeAllViews();
    noTagNotice.setVisibility(TextView.VISIBLE);
  }
  
  public TagListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    
    inflateLayout(context, attrs);
    
    noTagNotice = (TextView)findViewById(R.id.tag_no_tags);
    addedTagView = (ViewGroup)findViewById(R.id.tag_added_tags);
  }

  protected void inflateLayout(Context context, AttributeSet attrs){
    LayoutInflater.from(context).inflate(R.layout.taglist_view, this);
  }
  /**
   * Gets the set of tags associated with the view.
   * 
   * @return
   */
  public List<String> getTags() {
    return addedTags;
  }

  /**
   * Adds a tag to the list of tags for this view.
   * 
   * @param tag
   */
  public boolean addTag(String tag) {
    boolean added = false;
    if (tag.length() == 0){
      throw new IllegalArgumentException("cannot add empty tag");
    }
    if (! addedTags.contains(tag)){
      addedTags.add(tag);
      added = true;

      Collections.sort(addedTags);
      if (noTagNotice.getVisibility() != TextView.GONE){
        noTagNotice.setVisibility(TextView.GONE);
      }
      addedTagView.addView(getTagView(tag, true), addedTags.indexOf(tag));
    }
    
    return added;
  }

  public void addTags(Collection<String> tags) {
    for (final String tag: tags){
      addTag(tag);
    }
  }

  /**
   * Removes a tag from the view. If it's recommended, it'll remain in the recommendations.
   * 
   * @param tag
   */
  public boolean removeTag(String tag) {
    boolean removed = false;
    
    if (addedTags.contains(tag)){
      addedTagView.removeViewAt(addedTags.indexOf(tag));
      addedTags.remove(tag);
      if (addedTags.size() == 0){
        if (noTagNotice.getVisibility() != TextView.VISIBLE){
          noTagNotice.setVisibility(TextView.VISIBLE);
        }
      }
      removed = true;
    }
    return removed;
  }

  TagButton getTagView(String tag, boolean added){
    final TagButton b = new TagButton(getContext(), tag, added, false);
    b.setOnClickListener(tagHandler);
    return b;
  }
  
  public void setOnTagClickListener(OnClickListener tagHandler){
    this.tagHandler = tagHandler;
  }
}