/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.contentassist;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.TextPresentation;
/**
* A context information presenter determines the presentation
* of context information depending on a given document position.
* <p>
* The interface can be implemented by clients.
* </p>
*
* @since 2.0
*/
public interface IContextInformationPresenter {
/**
* Installs this presenter for the given context information.
*
* @param info the context information which this presenter should style
* @param viewer the text viewer on which the information is presented
* @param offset the document offset for which the information has been computed
*/
void install(IContextInformation info, ITextViewer viewer, int offset);
/**
* Updates the given presentation of the given context information
* at the given document position. Returns whether update changed the
* presentation.
*
* @param offset the current offset within the document
* @param presentation the presentation to be updated
* @return <code>true</code> if the given presentation has been changed
*/
boolean updatePresentation(int offset, TextPresentation presentation);
}