WorkItemEnumParameterWidget.java

/*
 * Copyright 2011 Red Hat, Inc. and/or its affiliates.
 * 
 * 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.kie.workbench.common.widgets.client.workitems;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;
import org.drools.workbench.models.datamodel.workitems.PortableEnumParameterDefinition;

/**
 * A Widget to display a Work Item Enum parameter
 */
public class WorkItemEnumParameterWidget extends WorkItemParameterWidget {

    interface WorkItemEnumParameterWidgetBinder
            extends
            UiBinder<HorizontalPanel, WorkItemEnumParameterWidget> {

    }

    @UiField
    Label parameterName;

    @UiField
    ListBox parameterValues;

    private static WorkItemEnumParameterWidgetBinder uiBinder = GWT.create( WorkItemEnumParameterWidgetBinder.class );

    public WorkItemEnumParameterWidget( PortableEnumParameterDefinition ppd,
                                        IBindingProvider bindingProvider,
                                        boolean isReadOnly ) {
        super( ppd,
               bindingProvider );
        this.parameterName.setText( ppd.getName() );
        this.parameterValues.setEnabled( !isReadOnly );

        boolean isItemSelected = false;
        String selectedItem = ppd.getValue();
        if ( ppd.getValues() != null ) {
            for ( int index = 0; index < ppd.getValues().length; index++ ) {
                String item = ppd.getValues()[ index ];
                this.parameterValues.addItem( item );
                if ( item.equals( selectedItem ) ) {
                    this.parameterValues.setSelectedIndex( index );
                    isItemSelected = true;
                }
            }
            if ( !isItemSelected ) {
                this.parameterValues.setSelectedIndex( 0 );
                ppd.setValue( this.parameterValues.getItemText( 0 ) );
            }
        }
    }

    @Override
    protected Widget getWidget() {
        return uiBinder.createAndBindUi( this );
    }

    @UiHandler("parameterValues")
    void parameterValuesOnChange( ChangeEvent event ) {
        int index = this.parameterValues.getSelectedIndex();
        if ( index == -1 ) {
            ( (PortableEnumParameterDefinition) ppd ).setValue( null );
        } else {
            ( (PortableEnumParameterDefinition) ppd ).setValue( this.parameterValues.getItemText( index ) );
        }
    }

}