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/***************************************************************************
* Copyright (c) 2004-2007 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.ui;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
/**
* @author Eike Stepper
*/
public class ComboAutoCompleter implements ModifyListener
{
private ComboViewer viewer;
public ComboAutoCompleter(ComboViewer viewer)
{
this.viewer = viewer;
}
public final ComboViewer getViewer()
{
return viewer;
}
public final void modifyText(ModifyEvent e)
{
String text = getText();
Object foundElement = findShortestLabel(text);
if (foundElement != null)
{
setSelection(new StructuredSelection(foundElement));
}
else
{
// setSelection(StructuredSelection.EMPTY);
}
}
protected void setSelection(StructuredSelection selection)
{
viewer.setSelection(selection);
}
private Object findShortestLabel(String prefix)
{
Object foundElement = null;
String shortestLabel = null;
ILabelProvider labelProvider = (ILabelProvider)viewer.getLabelProvider();
IStructuredContentProvider contentProvider = (IStructuredContentProvider)viewer.getContentProvider();
for (Object element : contentProvider.getElements(viewer.getInput()))
{
String label = labelProvider.getText(element);
if (label.startsWith(prefix))
{
if (shortestLabel == null || label.length() < shortestLabel.length())
{
shortestLabel = label;
foundElement = element;
}
}
}
return foundElement;
}
private String getText()
{
return viewer.getCombo().getText();
}
public static void attach(ComboViewer viewer, ComboAutoCompleter completer)
{
viewer.getCombo().addModifyListener(completer);
}
public static void attach(ComboViewer viewer)
{
viewer.getCombo().addModifyListener(new ComboAutoCompleter(viewer));
}
}
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