/**

  * 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 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;

 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.KSSelectedList;

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

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

 /**

  * Adds the appropriate handler to the widget contained within the FieldDescriptor for when

  * to set that the field has had focus/user interaction based on what type of widget

  *

  * @author Kuali Student Team

  */

 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()) {

                         processValidationEvent(fd);

                     }

                 }

             });

         } else if (w instanceof HasBlurHandlers) {

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

                 public void onBlur(BlurEvent event) {

                     processValidationEvent(fd);

                 }

             });

         } else if (w instanceof HasFocusLostCallbacks) {

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

                 @Override

                 public void exec(Boolean result) {

                     processValidationEvent(fd);

                 }

             });

         } 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);

         }

         if (w instanceof KSSelectedList) {

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

                 @Override

                 public void exec(Boolean result) {

                     processValidationEvent(fd);

                 }

             });

         }

     }

     private void processValidationEvent(FieldDescriptor fieldDescriptor) {

         fieldDescriptor.setHasHadFocus(true);

         fieldDescriptor.getValidationRequestCallback().exec(true);

     }

 }