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jeremybenn |
/* ListUI.java --
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Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.plaf;
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import java.awt.Point;
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import java.awt.Rectangle;
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import javax.swing.JList;
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/**
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* An abstract base class for delegates that implement the pluggable
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* look and feel for a <code>JList</code>.
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*
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* @author Sascha Brawer (brawer@dandelis.ch)
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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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* Constructs a new <code>ListUI</code>.
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*/
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public ListUI()
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{
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// Nothing to do here.
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}
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/**
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* Determines the cell index which is the closest to the specified
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* location. The find out whether the returned cell actually
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* contains the location, the caller should also use {@link
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* #getCellBounds}.
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*
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* @param list the <code>JList</code> for which this delegate object
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* provides the pluggable user interface.
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*
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* @param location a point in the <code>JList</code> coordinate
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* system.
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*
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* @return the index of the closest cell, or -1 if the list model
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* is empty.
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*/
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public abstract int locationToIndex(JList list, Point location);
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/**
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* Determines the location of the specified cell.
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*
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* @param list the <code>JList</code> for which this delegate object
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* provides the pluggable user interface.
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*
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* @param index the zero-based index of the cell whose location shall be
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* determined.
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*
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* @return the position of the top left corner of the cell in the
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* <code>JList</code> coordinate system, or <code>null</code>
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* if <code>cell</code> does not designate a valid cell.
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*/
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public abstract Point indexToLocation(JList list, int index);
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/**
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* Determines the bounding box of the rectangle spanned by
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* two list indices.
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*
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* @param list the <code>JList</code> for which this delegate object
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* provides the pluggable user interface.
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*
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* @param index1 the zero-based index of the first cell.
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*
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* @param index2 the zero-based index of the second cell.
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*
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* @return the spanned rectangle, or <code>null</code> if either
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* <code>index1</code> or <code>index2</code> does not
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* designate a valid cell.
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*/
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public abstract Rectangle getCellBounds(JList list,
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int index1, int index2);
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}
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