/*
* Copyright 2012 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.workbench.screens.guided.scorecard.client.widget;
import com.google.gwt.cell.client.AbstractInputCell;
import com.google.gwt.cell.client.ValueUpdater;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.dom.client.SelectElement;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* A {@link com.google.gwt.cell.client.Cell} used to render a drop-down list.
*/
public class DynamicSelectionCell extends AbstractInputCell<String, String> {
interface Template extends SafeHtmlTemplates {
@Template("<option value=\"{0}\">{0}</option>")
SafeHtml deselected( String option );
@Template("<option value=\"{0}\" selected=\"selected\">{0}</option>")
SafeHtml selected( String option );
}
private static Template template;
private HashMap<String, Integer> indexForOption = new HashMap<String, Integer>();
private final List<String> options;
/**
* Construct a new {@link com.google.gwt.cell.client.SelectionCell} with the specified options.
* @param options the options in the cell
*/
public DynamicSelectionCell( final List<String> options ) {
super( "change" );
if ( template == null ) {
template = GWT.create( Template.class );
}
this.options = new ArrayList<String>( options );
int index = 0;
for ( String option : options ) {
indexForOption.put( option,
index++ );
}
}
public void addOption( final String newOp ) {
String option = new String( newOp );
options.add( option );
refreshIndexes();
}
public void setOptions( final List<String> newOptions ) {
options.clear();
indexForOption.clear();
options.addAll( newOptions );
int index = 0;
for ( String option : options ) {
indexForOption.put( option,
index++ );
}
refreshIndexes();
}
public void removeOption( final String op ) {
String option = new String( op );
options.remove( indexForOption.get( option ) );
refreshIndexes();
}
private void refreshIndexes() {
int index = 0;
for ( String option : options ) {
indexForOption.put( option,
index++ );
}
}
@Override
public void onBrowserEvent( final Context context,
final Element parent,
final String value,
final NativeEvent event,
final ValueUpdater<String> valueUpdater ) {
super.onBrowserEvent( context,
parent,
value,
event,
valueUpdater );
final String type = event.getType();
if ( "change".equals( type ) ) {
final Object key = context.getKey();
final SelectElement select = parent.getFirstChild().cast();
final String newValue = options.get( select.getSelectedIndex() );
setViewData( key, newValue );
finishEditing( parent,
newValue,
key,
valueUpdater );
if ( valueUpdater != null ) {
valueUpdater.update( newValue );
}
}
}
@Override
public void render( final Context context,
final String value,
final SafeHtmlBuilder sb ) {
// Get the view data.
final Object key = context.getKey();
String viewData = getViewData( key );
if ( viewData != null && viewData.equals( value ) ) {
clearViewData( key );
viewData = null;
}
final int selectedIndex = getSelectedIndex( viewData == null ? value : viewData );
sb.appendHtmlConstant( "<select tabindex=\"-1\">" );
int index = 0;
for ( String option : options ) {
if ( index++ == selectedIndex ) {
sb.append( template.selected( option ) );
} else {
sb.append( template.deselected( option ) );
}
}
sb.appendHtmlConstant( "</select>" );
}
private int getSelectedIndex( final String value ) {
final Integer index = indexForOption.get( value );
if ( index == null ) {
return -1;
}
return index.intValue();
}
}