/*
* Copyright 2011 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.decisiontable.cells;
import org.drools.ide.common.client.modeldriven.ui.ConstraintValueEditorHelper;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyDownEvent;
import com.google.gwt.event.dom.client.KeyDownHandler;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.PopupPanel.PositionCallback;
/**
* A Popup drop-down Editor ;-)
*/
public class PopupDropDownEditCell extends
AbstractPopupEditCell<String, String> {
private final ListBox listBox;
private String[][] items;
public PopupDropDownEditCell() {
super();
this.listBox = new ListBox();
// Tabbing out of the ListBox commits changes
listBox.addKeyDownHandler( new KeyDownHandler() {
public void onKeyDown(KeyDownEvent event) {
boolean keyTab = event.getNativeKeyCode() == KeyCodes.KEY_TAB;
boolean keyEnter = event.getNativeKeyCode() == KeyCodes.KEY_ENTER;
if ( keyEnter
|| keyTab ) {
commit();
}
}
} );
vPanel.add( listBox );
}
@Override
public void render(Context context,
String value,
SafeHtmlBuilder sb) {
if ( value != null ) {
String label = getLabel( value );
sb.append( renderer.render( label ) );
}
}
/**
* Set content of drop-down
*
* @param items
*/
public void setItems(String[] items) {
this.items = new String[items.length][2];
for ( int i = 0; i < items.length; i++ ) {
String item = items[i].trim();
if ( item.indexOf( '=' ) > 0 ) {
String[] splut = ConstraintValueEditorHelper.splitValue( item );
this.items[i][0] = splut[0];
this.items[i][1] = splut[1];
this.listBox.addItem( splut[1],
splut[0] );
} else {
this.items[i][0] = item;
this.items[i][1] = item;
this.listBox.addItem( item,
item );
}
}
}
// Lookup the display text based on the value
private String getLabel(String value) {
for ( int i = 0; i < this.items.length; i++ ) {
if ( this.items[i][0].equals( value ) ) {
return items[i][1];
}
}
return "";
}
// Commit the change
@Override
protected void commit() {
// Update value
String value = null;
int selectedIndex = listBox.getSelectedIndex();
if ( selectedIndex >= 0 ) {
value = listBox.getValue( selectedIndex );
}
setValue( lastContext,
lastParent,
value );
if ( valueUpdater != null ) {
valueUpdater.update( value );
}
panel.hide();
}
// Start editing the cell
@Override
protected void startEditing(final Context context,
final Element parent,
final String value) {
// Select the appropriate item
boolean emptyValue = (value == null);
if ( emptyValue ) {
listBox.setSelectedIndex( 0 );
} else {
for ( int i = 0; i < listBox.getItemCount(); i++ ) {
if ( listBox.getValue( i ).equals( value ) ) {
listBox.setSelectedIndex( i );
break;
}
}
}
panel.setPopupPositionAndShow( new PositionCallback() {
public void setPosition(int offsetWidth,
int offsetHeight) {
panel.setPopupPosition( parent.getAbsoluteLeft()
+ offsetX,
parent.getAbsoluteTop()
+ offsetY );
// Focus the first enabled control
Scheduler.get().scheduleDeferred( new ScheduledCommand() {
public void execute() {
listBox.setFocus( true );
}
} );
}
} );
}
}