/**********************************************
    * Copyright (C) 2011 Lukas Laag
    * This file is part of svgreal.
    * 
    * svgreal 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.
    * 
   * svgreal 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 svgreal.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.edit.client.gxt.widget;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import com.extjs.gxt.ui.client.data.ModelData;
  import com.extjs.gxt.ui.client.widget.grid.GridSelectionModel;
  
  /**
   * Subclass to GridSelectionModel which allows the grid to be null
   * @author laaglu
   * @param <M>
   * The grid model class.
   */
  public class GridSelectionModelExt<M extends ModelData> extends GridSelectionModel<M> {
  	  @Override
  	  protected void onLastFocusChanged(M oldFocused, M newFocused) {
  		  if (grid != null) {
  			  super.onLastFocusChanged(oldFocused, newFocused);
  		  }
  	  }
  	  @Override
  	  protected void onSelectChange(M model, boolean select) {
  		  if (grid != null) {
  			  super.onSelectChange(model, select);
  		  }
  	  }
  	  
  	  public int getCount() {
  		  return selected.size();
  	  }
  	  
  	  public int getSelectedIndex() {
  		  return (lastSelected != null) ? getIndex(lastSelected) : -1;
  	  }
  	  
  	  public int getIndex(M model) {
  		  for (int i = 0, size = listStore.getCount(); i < size; i++) {
  			  if (listStore.getAt(i) == model) {
  				  return i;
  			  }
  		  }
  		  return -1;
  	  }
  	  
  	  public Set<Integer> getSelectedIndices() {
  		  if (listStore == null) {
  			  return Collections.<Integer>emptySet();
  		  }
  		  Map<M, Integer> modelToIndex = new HashMap<M, Integer>();
  		  for (int i = 0, size = listStore.getCount(); i < size; i++) {
  			  modelToIndex.put(listStore.getAt(i), i);
  		  }
  		  Set<Integer> indices = new HashSet<Integer>();
  		  for (M m : selected) {
  			  indices.add(modelToIndex.get(m));
  		  }
  		  return indices;
  	  }
  }