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/*******************************************************************************
* 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;
/**
* Extension interface for {@link org.eclipse.jface.text.ITextViewer}.
* Introduces the concept of text presentation listeners and improves focus
* handling among widget token keepers.
*
* A {@link org.eclipse.jface.text.ITextPresentationListener}is a listener that
* is informed by the viewer that a text presentation is about to be applied.
* During this callback the listener is allowed to modify the presentation. Text
* presentation listeners are thus a mean to participate in the process of text
* presentation creation.
*
* @since 3.0
*/
public interface ITextViewerExtension4 {
/**
* Instructs the receiver to request the {@link IWidgetTokenKeeper}
* currently holding the widget token to take the keyboard focus.
*
* @return true if there was any
* IWidgetTokenKeeper that was asked to take the
* focus, false otherwise
*/
boolean moveFocusToWidgetToken();
/**
* Adds the given text presentation listener to this text viewer.
* This call has no effect if the listener is already registered
* with this text viewer.
*
* @param listener the text presentation listener
*/
void addTextPresentationListener(ITextPresentationListener listener);
/**
* Removes the given text presentation listener from this text viewer.
* This call has no effect if the listener is not registered with this
* text viewer.
*
* @param listener the text presentation listener
*/
void removeTextPresentationListener(ITextPresentationListener listener);
}