/* ListUI.java --
Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath.
GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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General Public License for more details.
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02111-1307 USA.
Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
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package javax.swing.plaf;
import java.awt.Point;
import java.awt.Rectangle;
import javax.swing.JList;
/**
* An abstract base class for delegates that implement the pluggable
* look and feel for a <code>JList</code>.
*
* @author Sascha Brawer (brawer@dandelis.ch)
*/
public abstract class ListUI
extends ComponentUI
{
/**
* Constructs a new <code>ListUI</code>.
*/
public ListUI()
{
}
/**
* Determines the cell index which is the closest to the specified
* location. The find out whether the returned cell actually
* contains the location, the caller should also use {@link
* #getCellBounds}.
*
* @param list the <code>JList</code> for which this delegate object
* provides the pluggable user interface.
*
* @param location a point in the <code>JList</code> coordinate
* system.
*
* @return the index of the closest cell, or -1 if the list model
* is empty.
*/
public abstract int locationToIndex(JList index, Point location);
/**
* Determines the location of the specified cell.
*
* @param list the <code>JList</code> for which this delegate object
* provides the pluggable user interface.
*
* @param index the zero-based index of the cell whose location shall be
* determined.
*
* @return the position of the top left corner of the cell in the
* <code>JList</code> coordinate system, or <code>null</code>
* if <code>cell</code> does not designate a valid cell.
*/
public abstract Point indexToLocation(JList list, int index);
/**
* Determines the bounding box of the rectangle spanned by
* two list indices.
*
* @param list the <code>JList</code> for which this delegate object
* provides the pluggable user interface.
*
* @param index1 the zero-based index of the first cell.
*
* @param index2 the zero-based index of the second cell.
*
* @return the spanned rectangle, or <code>null</code> if either
* <code>index1</code> or <code>index2</code> does not
* designate a valid cell.
*/
public abstract Rectangle getCellBounds(JList list,
int index1, int index2);
}