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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.gef;
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/**
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* An <i>adapter</i> on an <code>EditPart</code> used to expose a descendant
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* contained in that EditPart. <code>EditPartViewer</code> uses this interface
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* to reveal a given EditPart.
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* <P>
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* An expose helper is obtained by calling {@link EditPart#getAdapter(Class)}.
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* The returned helper is responsible for modifying *only* that EditPart's
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* visuals such that the specified descendant is made visible.
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*/
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public interface ExposeHelper {
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/**
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* Exposes the specified descendant on the EditPart which returned this
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* helper. This is done by adjusting the EditPart's <i>visuals</i> such that
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* the descendants <i>visuals</i> are exposed. Expose is performed from the
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* bottom up, meaning that EditParts in the parent-chain between the
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* helper's EditPart and the <i>descendant</i> will already have had a
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* change to expose the descendant.
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*
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* @param editpart
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* the descendant to expose
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*/
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void exposeDescendant(EditPart editpart);
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}
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