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Copyright 2010 JBoss Inc Licensed under the Apache 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.apache.org/licenses/LICENSE-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.drools.guvnor.client.modeldriven.ui;
 
 import  org.drools.guvnor.client.common.DropDownValueChanged;
 import  org.drools.guvnor.client.common.GenericCallback;
 import  org.drools.guvnor.client.common.IDirtyable;
 import  org.drools.guvnor.client.common.LoadingPopup;
 import  org.drools.guvnor.client.rpc.RepositoryServiceFactory;
 
A drop down for enumerated values

Author(s):
Toni Rikkola
 
 public class EnumDropDown extends ListBox
     implements
     IDirtyable {
     private DropDownValueChanged valueChanged;
 
     public EnumDropDown(final String currentValue,
                         final DropDownValueChanged valueChanged,
                         final DropDownData dropData) {
         final Constants cs = GWT.create( Constants.class );
 
         this.valueChanged = valueChanged;
 
         addChangeListener( new ChangeListener() {
             public void onChange(Widget w) {
                 valueChanged.valueChanged( getItemText( getSelectedIndex() ),
                                            getValue( getSelectedIndex() ) );
             }
         } );
 
         //if we have to do it lazy, we will hit up the server when the widget gets focus
         if ( dropData.fixedList == null && dropData.queryExpression != null ) {
             DeferredCommand.addCommand( new Command() {
                 public void execute() {
                     LoadingPopup.showMessage( cs.RefreshingList() );
                     RepositoryServiceFactory.getService().loadDropDownExpression( dropData.valuePairs,
                                                                                   dropData.queryExpression,
                                                                                   new GenericCallback() {
                                                                                       public void onSuccess(Object data) {
                                                                                           LoadingPopup.close();
                                                                                           String[] list = (String[]) data;
 
                                                                                           if ( list.length == 0 ) {
                                                                                               list = new String[]{cs.UnableToLoadList()};
                                                                                           }
 
                                                                                           fillDropDown( currentValue,
                                                                                                         list );
                                                                                       }
 
                                                                                       public void onFailure(Throwable t) {
                                                                                           LoadingPopup.close();
                                                                                           //just do an empty drop down...
                                                                                           fillDropDown( currentValue,
                                                                                                         new String[]{cs.UnableToLoadList()} );
                                                                                       }
                                                                                   } );
                 }
             } );
 
         } else {
             //otherwise its just a normal one...
             fillDropDown( currentValue,
                           dropData.fixedList );
         }
 
         if ( currentValue == null || "".equals( currentValue ) ) {
             int ix = getSelectedIndex();
             if ( ix > -1 ) {
                 valueChanged.valueChanged( getItemText( ix ),
                                           getValue( ix ) );
            }
        }
    }
    private void fillDropDown(final String currentValue,
                              final String[] enumeratedValues) {
        boolean selected = false;
        clear();
        for ( int i = 0; i < enumeratedValues.length; i++ ) {
            String v = enumeratedValues[i];
            String val;
            if ( v.indexOf( '=' ) > 0 ) {
                //using a mapping
                String[] splut = ConstraintValueEditorHelper.splitValue( v );
                String realValue = splut[0];
                String display = splut[1];
                val = realValue;
                addItem( display,
                         realValue );
            } else {
                addItem( v,
                         v );
                val = v;
            }
            if ( currentValue != null && currentValue.equals( val ) ) {
                setSelectedIndex( i );
                selected = true;
                valueChanged.valueChanged( getItemText( getSelectedIndex() ),
                                           getValue( getSelectedIndex() ) );
            }
        }
        if ( currentValue != null && !"".equals( currentValue ) && !selected ) {
            //need to add this value
            addItem( currentValue,
                     currentValue );
            setSelectedIndex( enumeratedValues.length );
        }
    }
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