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);
          }
      }
  }