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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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import org.eclipse.draw2d.geometry.Point;
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/**
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* An interface used by the {@link org.eclipse.gef.tools.SelectionTool} to
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* obtain a DragTracker. A GraphicalViewer will return a Handle at a given
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* location. The <code>SelectionTool</code> looks for <code>Handles</code> first
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* whenever the User presses the mouse button. If a Handle is found, it usually
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* offers a DragTracker, although <code>null</code> can also be returned.
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* <P>
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* For keyboard accessibility purposes, a Handle can provide a Point at which
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* the SelectionTool should programmatically place the mouse.
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*/
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public interface Handle {
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/**
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* Returns the DragTracker for dragging this Handle.
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*
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* @return <code>null</code> or a <code>DragTracker</code>
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*/
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DragTracker getDragTracker();
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/**
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* Returns an optional accessibility Point. This returned point is in
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* absolute coordinates.
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*
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* @return <code>null</code> or the absolute location
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*/
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Point getAccessibleLocation();
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}
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