/**********************************************
    * 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.binding;
  
  import org.vectomatic.svg.edit.client.gxt.form.FloatSliderField;
  
  import com.extjs.gxt.ui.client.data.ModelData;
  import com.extjs.gxt.ui.client.event.DragEvent;
  import com.extjs.gxt.ui.client.event.DragListener;
  import com.extjs.gxt.ui.client.event.Events;
  import com.extjs.gxt.ui.client.event.Listener;
  import com.extjs.gxt.ui.client.event.SliderEvent;
  import com.extjs.gxt.ui.client.widget.Slider;
  
  /**
   * Binds a slider with a 
   * CSS property of an SVGStyleElementModel.
   * @author laaglu
   */
  public class FloatSliderFieldBinding extends DelayedBindingBase {
  	private Listener<SliderEvent> sliderClickListener;
  	private DragListener dragListener;
  
  	public FloatSliderFieldBinding(FloatSliderField field, String property) {
  		super(field, property);
  		sliderClickListener = new Listener<SliderEvent>() {
  			public void handleEvent(SliderEvent be) {
  //				GWT.log("FloatSliderFieldBinding.click");
  				commitChanges();
  			}
  		};
  
  		
  		// This listener will temporarily disable the capture
  		// of model changes to avoid generating dozens of
  		// commands as one drags the slider knob. Only one
  		// command should be generated, when the knob is released.
  		dragListener = new DragListener() {
  			@Override
  			public void dragEnd(DragEvent de) {
  //				GWT.log("FloatSliderFieldBinding.dragEnd");
  				commitChanges();
  			}
  		};
  	}
  	
  	@Override
  	public void bind(ModelData model) {
  		super.bind(model);
  		Slider slider = ((FloatSliderField)field).getSlider();
  		slider.addListener(Events.DragEnd, dragListener);
  		slider.addListener(Events.OnClick, sliderClickListener);
  	}
  	
  	@Override
  	public void unbind() {
  		Slider slider = ((FloatSliderField)field).getSlider();
  		slider.removeListener(Events.DragEnd, dragListener);
  		slider.removeListener(Events.OnClick, sliderClickListener);
  		super.unbind();
  	}
  }