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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
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package org.netbeans.api.visual.action;
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import org.netbeans.api.visual.widget.Widget;
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import org.netbeans.api.visual.widget.Scene;
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* This interface controls a connect action.
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* @author David Kaspar
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public interface ConnectProvider {
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* Called for checking whether a specified source widget is a possible source of a connection.
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* @param sourceWidget the source widget
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* @return if true, then it is possible to create a connection for the source widget; if false, then is not allowed
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boolean isSourceWidget (Widget sourceWidget);
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* Called for checking whether a connection could be created between a specified source and target widget.
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* Called only when a hasCustomTargetWidgetResolver returns false.
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* @param sourceWidget the source widget
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* @param targetWidget the target widget
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* @return the connector state
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ConnectorState isTargetWidget (Widget sourceWidget, Widget targetWidget);
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* Called to check whether the provider has a custom target widget resolver.
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* @param scene the scene where the resolver will be called
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* @return if true, then the resolveTargetWidget method is called for resolving the target widget;
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* if false, then the isTargetWidget method is called for resolving the target widget
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boolean hasCustomTargetWidgetResolver (Scene scene);
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* Called to find the target widget of a possible connection.
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* Called only when a hasCustomTargetWidgetResolver returns true.
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* @param scene the scene
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* @param sceneLocation the scene location
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* @return the target widget; null if no target widget found
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Widget resolveTargetWidget (Scene scene, Point sceneLocation);
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* Called for creating a new connection between a specified source and target widget.
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* This method is called only when the possible connection is available and an user approves its creation.
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* @param sourceWidget the source widget
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* @param targetWidget the target widget
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void createConnection (Widget sourceWidget, Widget targetWidget);