/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community License, Version 2.0 (the "License"); you may

  * not use this file except in compliance with the License. You may

  * obtain a copy of the License at

  *

  * http://www.osedu.org/licenses/ECL-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an "AS IS"

  * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express

  * or implied. See the License for the specific language governing

  * permissions and limitations under the License.

  */

 package org.kuali.student.common.ui.client.configurable.mvc;

 import org.kuali.student.common.ui.client.configurable.mvc.multiplicity.MultiplicityGroup;

 import org.kuali.student.common.ui.client.mvc.Callback;

 import org.kuali.student.common.ui.client.mvc.HasFocusLostCallbacks;

 import org.kuali.student.common.ui.client.widgets.KSLabel;

 import org.kuali.student.common.ui.client.widgets.list.HasSelectionChangeHandlers;

 import org.kuali.student.common.ui.client.widgets.list.SelectionChangeEvent;

 import org.kuali.student.common.ui.client.widgets.list.SelectionChangeHandler;

 import com.google.gwt.core.client.GWT;

 import com.google.gwt.event.dom.client.BlurEvent;

 import com.google.gwt.event.dom.client.BlurHandler;

 import com.google.gwt.event.dom.client.HasBlurHandlers;

 import com.google.gwt.user.client.ui.Widget;

 public class ValidationEventBindingImpl  implements ValidationEventBinding {

     public void bind(final FieldDescriptor fd) {

             Widget w = fd.getFieldWidget();

         if (w instanceof HasSelectionChangeHandlers){

                 ((HasSelectionChangeHandlers) w).addSelectionChangeHandler(new SelectionChangeHandler(){

                                 @Override

                                 public void onSelectionChange(SelectionChangeEvent event) {

                                         if(event.isUserInitiated()){

                                                 fd.setHasHadFocus(true);

                                 fd.getValidationRequestCallback().exec(true);

                                         }

                                 }

                         });

         }

         else if (w instanceof HasBlurHandlers) {

             ((HasBlurHandlers)w).addBlurHandler(new BlurHandler() {

                 public void onBlur(BlurEvent event) {

                         fd.setHasHadFocus(true);

                         fd.getValidationRequestCallback().exec(true);

                 }

             });

         }

         else if(w instanceof HasFocusLostCallbacks){

                 ((HasFocusLostCallbacks) w).addFocusLostCallback(new Callback<Boolean>(){

                                 @Override

                                 public void exec(Boolean result) {

                                         fd.setHasHadFocus(true);

                         fd.getValidationRequestCallback().exec(true);

                                 }

                         });

         }

         else if(w instanceof KSLabel 

                         || w instanceof org.kuali.student.common.ui.client.configurable.mvc.multiplicity.MultiplicityComposite

                         || w instanceof MultiplicityGroup){

                 //Do nothing these are valid but do not fire validation events (maybe?)

         }

         else {

                 GWT.log("The field with key: " + fd.getFieldKey() +

                                 " does not use a widget which implements an interface that can perform on the fly validation", null);

         }

     }

 }