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

 import org.kuali.student.common.ui.client.widgets.layout.VerticalFlowPanel;

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

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

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

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

 /**

  * CheckBoxTextArea is for linking a master text area with a slave text area.

  * A check box is used to control when to use the text from master or from 

  * slave text area.

  * 

  * 

  * */

 public class CheckBoxTextArea extends Composite implements HasText{

     HasText master;

     KSTextArea slave = new KSTextArea();

     KSCheckBox checkBox = new KSCheckBox();

     public CheckBoxTextArea(HasText master, String checkBoxText){

         this.master = master;

         VerticalFlowPanel flowPanel = new VerticalFlowPanel();

         flowPanel.add(checkBox);

         flowPanel.add(slave);

         super.initWidget(flowPanel);

         checkBox.setStyleName("CheckBoxTextArea-CheckBox");

         slave.setStyleName("CheckBoxTextArea-TextArea");

         checkBox.addValueChangeHandler(new ValueChangeHandler(){

             @Override

             public void onValueChange(ValueChangeEvent event) {

                if(checkBox.getValue() == true){

                    slave.setVisible(false);

                }else{

                    slave.setVisible(true);

                }

             }

         });

         checkBox.setValue(true);

         checkBox.setText(checkBoxText);

     }

     @Override

     public String getText() {

         if(checkBox.getValue() == true){

             return master.getText();

         }else{

             return slave.getText();

         }

     }

     @Override

     public void setText(String text) {

         if(master.getText().equals(text)){

             checkBox.setValue(true);

         }else{

             checkBox.setValue(false);

             slave.setText(text);

         }

     }

 }