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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;
/**
* Implemented by tools supporting the editing process.
*
* Clients may ask an IEditingSupport whether it is currently
* displaying a shell that has focus, and whether it is the origin of a document
* event. Depending on the answers to these queries, clients may decide to react
* differently to incoming notifications about events. For example, a special
* editing mode, that usually deactivates when the main shell looses focus, may
* decide to not deactivate if the focus event was triggered by an
* IEditingSupport.
*
*
* Clients may implement this interface.
*
*
* @see IEditingSupportRegistry
* @since 3.1
*/
public interface IEditingSupport {
/**
* Returns true if the receiver is the originator of a
* DocumentEvent and if that event is related
* to subjectRegion.
*
* The relationship between event and
* subjectRegion is not always obvious. Often, the main
* editing area being monitored by the caller will be at
* subjectRegion, when the receiver modifies the underlying
* document at a different location without wanting to interrupt the normal
* typing flow of the user.
*
*
* An example would be an editor that automatically increments the section
* number of the next section when the user typed in a new section title. In
* this example, the subject region is the current typing location, while
* the increment results in a document change further down in the text.
*
*
* @param event the DocumentEvent in question
* @param subjectRegion the region that the caller is interested in
* @return true if event was triggered by the
* receiver and relates to subjectRegion
*/
boolean isOriginator(DocumentEvent event, IRegion subjectRegion);
/**
* Returns true if the receiver is showing a shell which has
* focus, false if it does not have focus or the helper has
* no shell.
*
* @return true if the support's shell has focus,
* false otherwise
*/
boolean ownsFocusShell();
}