JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1997, 2006, 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
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package javax.swing.plaf;

import javax.swing.JList;
import java.awt.Point;
import java.awt.Rectangle;


/**
 * The {@code JList} pluggable look and feel delegate.
 *
 * @author Hans Muller
 */

public abstract class ListUI extends ComponentUI
{
    /**
     * Returns the cell index in the specified {@code JList} closest to the
     * given location in the list's coordinate system. To determine if the
     * cell actually contains the specified location, compare the point against
     * the cell's bounds, as provided by {@code getCellBounds}.
     * This method returns {@code -1} if the list's model is empty.
     *
     * @param list the list
     * @param location the coordinates of the point
     * @return the cell index closest to the given location, or {@code -1}
     * @throws NullPointerException if {@code location} is null
     */
    public abstract int locationToIndex(JList list, Point location);


    /**
     * Returns the origin in the given {@code JList}, of the specified item,
     * in the list's coordinate system.
     * Returns {@code null} if the index isn't valid.
     *
     * @param list the list
     * @param index the cell index
     * @return the origin of the cell, or {@code null}
     */
    public abstract Point indexToLocation(JList list, int index);


    /**
     * Returns the bounding rectangle, in the given list's coordinate system,
     * for the range of cells specified by the two indices.
     * The indices can be supplied in any order.
     * <p>
     * If the smaller index is outside the list's range of cells, this method
     * returns {@code null}. If the smaller index is valid, but the larger
     * index is outside the list's range, the bounds of just the first index

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