/**

  * 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.

  */

 /**

  * This widget adds a label with remaining character count for KSTextBox, KSTextArea

  */

 package org.kuali.student.common.ui.client.widgets;

 import org.kuali.student.common.assembly.data.Metadata;

 import org.kuali.student.common.assembly.data.MetadataInterrogator;

 import org.kuali.student.common.ui.client.application.Application;

 import org.kuali.student.common.ui.client.configurable.mvc.DefaultWidgetFactory;

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

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

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

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

 import com.google.gwt.event.logical.shared.ValueChangeEvent;

 import com.google.gwt.event.logical.shared.ValueChangeHandler;

 import com.google.gwt.event.shared.HandlerRegistration;

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

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

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

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

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

 public class KSCharCount extends Composite implements HasText, HasInputWidget, HasBlurHandlers {

     VerticalPanel countingPanel;

     Widget inputWidget;

     KSLabel countingLabel;

     private int maxLength;

     public KSCharCount() {}

     public KSCharCount(Metadata metadata) {

         countingPanel = new VerticalPanel();

         countingLabel = new KSLabel();

         super.initWidget(countingPanel);

         this.setWidget(DefaultWidgetFactory.getInstance().getWidget(metadata));

         this.setMaxLength(metadata);

         if (this.inputWidget instanceof TextBoxBase) {

             ((TextBoxBase) (this.inputWidget)).addKeyUpHandler(new KeyUpHandler() {

                 @Override

                 public void onKeyUp(KeyUpEvent event) {

                     countingLabel.setText(setLabel());

                 }

             });

             ((TextBoxBase) (this.inputWidget)).addValueChangeHandler(new ValueChangeHandler<String>() {

                 @Override

                 public void onValueChange(ValueChangeEvent<String> event) {

                     countingLabel.setText(setLabel());

                 }

             });

         }

         countingLabel.setStyleName("ks-form-module-elements-help-text");

         countingLabel.setText(this.setLabel());

         countingPanel.add(inputWidget);

         countingPanel.add(countingLabel);

     }

     public void setMaxLength(Metadata metadata) {

         this.maxLength = MetadataInterrogator.getSmallestMaxLength(metadata);

     }

     public void setWidget(Widget widget) {

         if (widget instanceof TextBoxBase) {

             this.inputWidget = widget;

         } else {

             this.inputWidget = new KSTextBox();

         }

     }

     public int getRemCount() {

         int rem = 0;

         if ((this.getText() != null) && (this.getText().length() <= maxLength)) {

             rem = this.maxLength - ((TextBoxBase) (this.inputWidget)).getText().length();

         }

         if (this.getText() == null) {

             rem = this.maxLength;

         }

         return rem;

     }

     public String setLabel() {

         int rem = getRemCount();

         if ((rem <= (this.maxLength * 0.1)) || (rem <= 10)) {

             countingLabel.getElement().setAttribute("style", "color: red;");

         } else {

             countingLabel.getElement().removeAttribute("style");

         }

         return (rem + " " + Application.getApplicationContext().getUILabel("common", "remainingChars"));

     }

     @Override

     public String getText() {

         return ((TextBoxBase) (this.inputWidget)).getText();

     }

     @Override

     public void setText(String text) {

         ((TextBoxBase) (this.inputWidget)).setText(text);

     }

     @Override

     public Widget getInputWidget() {

         return this.inputWidget;

     }

     @Override

     public HandlerRegistration addBlurHandler(BlurHandler handler) {

         return ((TextBoxBase) (this.inputWidget)).addBlurHandler(handler);

     }

 }