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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javafx.scene.control;

import javafx.scene.Node;

/**
 * Base class for defining the visual representation of user interface controls 
 * by defining a scene graph of nodes to represent the skin.
 * A user interface control is abstracted behind the {@link Skinnable} interface.
 * 
 * @param  A subtype of Skinnable that the Skin represents. This allows for
 *      Skin implementation to access the {@link Skinnable} implementation, 
 *      which is usually a {@link Control} implementation.
 * @since JavaFX 2.0
 */
public interface Skin {
    /**
     * Gets the Skinnable to which this Skin is assigned. A Skin must be created
     * for one and only one Skinnable. This value will only ever go from a
     * non-null to null value when the Skin is removed from the Skinnable, and
     * only as a consequence of a call to {@link #dispose()}.
     * 
     * The caller who constructs a Skinnable must also construct a Skin and
     * properly establish the relationship between the Control and its Skin.
     *
     * @return A non-null Skinnable, or null value if disposed.
     */
    public C getSkinnable();

    /**
     * Gets the Node which represents this Skin. This must never be null, except
     * after a call to {@link #dispose()}, and must never change except when
     * changing to null.
     *
     * @return A non-null Node, except when the Skin has been disposed.
     */
    public Node getNode();

    /**
     * Called by a Skinnable when the Skin is replaced on the Skinnable. This method
     * allows a Skin to implement any logic necessary to clean up itself after
     * the Skin is no longer needed. It may be used to release native resources.
     * The methods {@link #getSkinnable()} and {@link #getNode()}
     * should return null following a call to dispose. Calling dispose twice
     * has no effect.
     */
    public void dispose();
}