/**********************************************
    * 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.form;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import com.extjs.gxt.ui.client.Style.IconAlign;
  import com.extjs.gxt.ui.client.Style.Orientation;
  import com.extjs.gxt.ui.client.event.ButtonEvent;
  import com.extjs.gxt.ui.client.event.SelectionListener;
  import com.extjs.gxt.ui.client.widget.LayoutContainer;
  import com.extjs.gxt.ui.client.widget.button.ToggleButton;
  import com.extjs.gxt.ui.client.widget.form.AdapterField;
  import com.extjs.gxt.ui.client.widget.layout.FillData;
  import com.extjs.gxt.ui.client.widget.layout.FillLayout;
  import com.google.gwt.user.client.ui.AbstractImagePrototype;
  
  /**
   * Field subclass with a discrete set of possible values,
   * each value being represented by a toggle button with
   * an icon
   * @author laaglu
   */
  public class ToggleGroupField extends AdapterField {
  	static int toggleGroupId;
  	private class ToggleGroupFieldPanel extends LayoutContainer {
  		private Map<ToggleButton, String> toggleToValue;
  		private Map<String, ToggleButton> valueToToggle;
  		private SelectionListener<ButtonEvent> listener = new SelectionListener<ButtonEvent>() {
  			@Override
  			public void componentSelected(ButtonEvent ce) {
  				ToggleGroupField.this.setValue(toggleToValue.get(ce.getButton()));
  			}
  		};
  		
  		public ToggleGroupFieldPanel(
  				String[] values,
  				String[] tooltips,
  				AbstractImagePrototype icons[]) { 
  			setLayout(new FillLayout(Orientation.HORIZONTAL));
  			toggleToValue = new HashMap<ToggleButton, String>();
  			valueToToggle = new HashMap<String, ToggleButton>();
  			String groupName = "ToggleGroupField" + toggleGroupId++;
  			for (int i = 0; i < values.length;i++) {
  				ToggleButton button = new ToggleButton();
  				button.setToggleGroup(groupName);
  				button.setToolTip(tooltips[i]);
  				button.setIconAlign(IconAlign.TOP);
  				button.setIcon(icons[i]);
  				button.addSelectionListener(listener);
  				add(button, i < values.length -1 ? new FillData(0, 2, 0, 0) : new FillData(0));
  				toggleToValue.put(button, values[i]);
  				valueToToggle.put(values[i], button);
  			}
  		}
  		
  		public void update(String value) {
  			if (value != null) {
  				ToggleButton button = valueToToggle.get(value);
  				if (button != null) {
  					button.toggle(true);
  				}
  			}
  		}
  	}
  	
  	public ToggleGroupField(
  			String[] values,
  			String[] tooltips,
  			AbstractImagePrototype icons[]) {
  		super(null);
  		widget = new ToggleGroupFieldPanel(values, tooltips, icons);
  		setResizeWidget(true);
  		setFireChangeEventOnSetValue(true);
  	}
  
  	@Override
  	public void setValue(Object value) {
  		((ToggleGroupFieldPanel)widget).update((String)value);
  		super.setValue(value);
  	}
  	
  	@Override
 	public Object getValue() {
 		return value;
 	}
 }