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85 lines
2.3 KiB
85 lines
2.3 KiB
/*
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* Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing.plaf;
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import javax.swing.JList;
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import java.awt.Point;
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import java.awt.Rectangle;
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/**
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* The {@code JList} pluggable look and feel delegate.
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*
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* @author Hans Muller
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*/
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public abstract class ListUI extends ComponentUI
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{
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/**
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* Returns the cell index in the specified {@code JList} closest to the
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* given location in the list's coordinate system. To determine if the
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* cell actually contains the specified location, compare the point against
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* the cell's bounds, as provided by {@code getCellBounds}.
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* This method returns {@code -1} if the list's model is empty.
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*
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* @param list the list
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* @param location the coordinates of the point
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* @return the cell index closest to the given location, or {@code -1}
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* @throws NullPointerException if {@code location} is null
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*/
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public abstract int locationToIndex(JList list, Point location);
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/**
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* Returns the origin in the given {@code JList}, of the specified item,
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* in the list's coordinate system.
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* Returns {@code null} if the index isn't valid.
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*
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* @param list the list
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* @param index the cell index
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* @return the origin of the cell, or {@code null}
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*/
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public abstract Point indexToLocation(JList list, int index);
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/**
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* Returns the bounding rectangle, in the given list's coordinate system,
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* for the range of cells specified by the two indices.
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* The indices can be supplied in any order.
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* <p>
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* If the smaller index is outside the list's range of cells, this method
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* returns {@code null}. If the smaller index is valid, but the larger
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* index is outside the list's range, the bounds of just the first index
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* is returned. Otherwise, the bounds of the valid range is returned.
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*
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* @param list the list
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* @param index1 the first index in the range
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* @param index2 the second index in the range
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* @return the bounding rectangle for the range of cells, or {@code null}
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*/
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public abstract Rectangle getCellBounds(JList list, int index1, int index2);
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}
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