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/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
package org.eclipse.compare.internal;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.compare.CompareConfiguration;
/**
* A factory object for creating a <code>Viewer</code>s from a descriptor.
* <p>
* It is used when registering a viewer for a specific type
* in <code>CompareUIPlugin.registerContentViewerDescriptor</code> and
* in <code>CompareUIPlugin.registerStructureViewerDescriptor</code>.
*
* @see org.eclipse.compare.structuremergeviewer.IStructureCreator
* @see CompareUIPlugin
*/
public interface IViewerDescriptor {
/**
* Creates a new viewer from this descriptor under the given STW parent control.
* If the current viewer has the same type as a new viewer
* the implementation of this method is free to return the current viewer instead.
*
* @param currentViewer the current viewer which is going to be replaced with a new viewer.
* @param parent the SWT parent control under which the new viewer has to be created.
* @param config a compare configuration the new viewer might be interested in.
* @return a new viewer or the current viewer.
*/
Viewer createViewer(Viewer currentViewer, Composite parent, CompareConfiguration config);
}
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