/**********************************************
    * 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 java.util.HashMap;
  import java.util.Map;
  
  import org.vectomatic.dom.svg.OMSVGLength;
  import org.vectomatic.dom.svg.OMSVGSVGElement;
  import org.vectomatic.dom.svg.utils.SVGConstants;
  import org.vectomatic.svg.edit.client.command.GenericEditCommandFactory;
  import org.vectomatic.svg.edit.client.engine.SVGModel;
  import org.vectomatic.svg.edit.client.gxt.form.ImageHrefField;
  import org.vectomatic.svg.edit.client.model.svg.SVGImageElementModel;
  import org.vectomatic.svg.edit.client.model.svg.SVGLength;
  
  import com.extjs.gxt.ui.client.binding.FieldBinding;
  import com.extjs.gxt.ui.client.data.ModelData;
  import com.extjs.gxt.ui.client.util.Size;
  import com.google.gwt.event.logical.shared.ValueChangeEvent;
  import com.google.gwt.event.logical.shared.ValueChangeHandler;
  import com.google.gwt.event.shared.HandlerRegistration;
  
  /**
   * Binding class for ImageHrefField
   * @author laaglu
   */
  public class ImageHrefFieldBinding extends FieldBinding implements ValueChangeHandler<Size> {
  	private HandlerRegistration registration;
  	
  	public ImageHrefFieldBinding(ImageHrefField field, String property) {
  		super(field, property);
  	}
  	public void updateModel() {
  		ImageHrefField field = (ImageHrefField)this.field;
  		SVGImageElementModel model = (SVGImageElementModel)this.model;
  		model.setResourceName(field.getResourceName());
  		super.updateModel();
  	}
  	@Override
  	public void onValueChange(ValueChangeEvent<Size> event) {
  		GenericEditCommandFactory factory = GenericEditCommandFactory.INSTANTIATOR.create();
  		factory.start(this);
  		Size size = event.getValue();
  		SVGImageElementModel imageModel = (SVGImageElementModel) model;
  		SVGModel owner = imageModel.getOwner();
  		OMSVGSVGElement svg = owner.getSvgElement();
  		Map<String, Object> oldValues = new HashMap<String, Object>();
  		oldValues.put(SVGConstants.SVG_WIDTH_ATTRIBUTE, imageModel.get(SVGConstants.SVG_WIDTH_ATTRIBUTE));
  		oldValues.put(SVGConstants.SVG_HEIGHT_ATTRIBUTE, imageModel.get(SVGConstants.SVG_HEIGHT_ATTRIBUTE));
  		imageModel.setSilent(true);
  		imageModel.set(SVGConstants.SVG_WIDTH_ATTRIBUTE, new SVGLength(svg.createSVGLength(OMSVGLength.SVG_LENGTHTYPE_PX, size.width)));
  		imageModel.set(SVGConstants.SVG_HEIGHT_ATTRIBUTE, new SVGLength(svg.createSVGLength(OMSVGLength.SVG_LENGTHTYPE_PX, size.height)));
  		imageModel.setSilent(false);
  		owner.getCommandStore().addCommand(factory.createCommand(imageModel, oldValues));
  	}
  	
  	@Override
  	public void bind(ModelData model) {
  		super.bind(model);
  		ImageHrefField imageField = (ImageHrefField)field;
  		registration = imageField.addValueChangeHandler(this);
  	}
  	
  	@Override
  	public void unbind() {
  		super.unbind();
  		registration.removeHandler();
  	}
  }