7950ed567c
* java/awt/List.java (addNotify): Correctly check to see if peer does not exist. From-SVN: r49335
1006 lines
24 KiB
Java
1006 lines
24 KiB
Java
/* List.java -- A listbox widget
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Copyright (C) 1999, 2002 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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 java.awt;
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import java.io.Serializable;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.awt.event.ItemEvent;
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import java.awt.event.ItemListener;
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import java.awt.peer.ListPeer;
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import java.awt.peer.ComponentPeer;
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import java.util.Vector;
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/**
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* Class that implements a listbox widget
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public class List extends Component implements ItemSelectable, Serializable
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{
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/*
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* Static Variables
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*/
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// Serialization constant
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private static final long serialVersionUID = -3304312411574666869L;
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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// FIXME: Need read/writeObject
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/**
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* @serial The items in the list.
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*/
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private Vector items = new Vector();
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/**
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* @serial Indicates whether or not multiple items can be selected
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* simultaneously.
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*/
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private boolean multipleMode;
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/**
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* @serial The number of rows in the list. This is set on creation
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* only and cannot be modified.
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*/
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private int rows;
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/**
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* @serial An array of the item indices that are selected.
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*/
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private int[] selected;
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/**
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* @serial An index value used by <code>makeVisible()</code> and
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* <code>getVisibleIndex</code>.
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*/
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private int visibleIndex;
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// The list of ItemListeners for this object.
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private ItemListener item_listeners;
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// The list of ActionListeners for this object.
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private ActionListener action_listeners;
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* Initializes a new instance of <code>List</code> with no visible lines
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* and multi-select disabled.
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*/
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public
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List()
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{
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this(4, false);
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>List</code> with the specified
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* number of visible lines and multi-select disabled.
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*
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* @param lines The number of visible lines in the list.
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*/
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public
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List(int rows)
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{
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this(rows, false);
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}
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/*************************************************************************/
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/**
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* Initializes a new instance of <code>List</code> with the specified
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* number of lines and the specified multi-select setting.
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*
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* @param lines The number of visible lines in the list.
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* @param multipleMode <code>true</code> if multiple lines can be selected
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* simultaneously, <code>false</code> otherwise.
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*/
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public
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List(int rows, boolean multipleMode)
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{
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this.rows = rows;
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this.multipleMode = multipleMode;
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}
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* Returns the number of items in this list.
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*
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* @return The number of items in this list.
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*/
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public int
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getItemCount()
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{
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return(items.size());
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}
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/*************************************************************************/
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/**
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* Returns the number of items in this list.
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*
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* @return The number of items in this list.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getItemCount()</code>
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*/
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public int
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countItems()
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{
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return(getItemCount());
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}
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/*************************************************************************/
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/**
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* Returns the complete list of items.
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*
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* @return The complete list of items in the list.
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*/
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public synchronized String[]
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getItems()
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{
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String[] l_items = new String[getItemCount()];
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items.copyInto(l_items);
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return(l_items);
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}
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/*************************************************************************/
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/**
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* Returns the item at the specified index.
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*
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* @param index The index of the item to retrieve.
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*
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* @exception IndexOutOfBoundsException If the index value is not valid.
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*/
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public String
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getItem(int index)
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{
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return((String)items.elementAt(index));
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}
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/*************************************************************************/
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/**
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* Returns the number of visible rows in the list.
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*
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* @return The number of visible rows in the list.
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*/
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public int
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getRows()
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{
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return(rows);
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}
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/*************************************************************************/
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/**
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* Tests whether or not multi-select mode is enabled.
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*
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* @return <code>true</code> if multi-select mode is enabled,
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* <code>false</code> otherwise.
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*/
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public boolean
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isMultipleMode()
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{
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return(multipleMode);
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}
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/*************************************************************************/
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/**
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* Tests whether or not multi-select mode is enabled.
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*
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* @return <code>true</code> if multi-select mode is enabled,
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* <code>false</code> otherwise.
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*
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* @deprecated This method is deprecated in favor of
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* <code>isMultipleMode()</code>.
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*/
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public boolean
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allowsMultipleSelections()
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{
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return(multipleMode);
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}
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/*************************************************************************/
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/**
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* This method enables or disables multiple selection mode for this
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* list.
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*
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* @param multipleMode <code>true</code> to enable multiple mode,
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* <code>false</code> otherwise.
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*/
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public void
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setMultipleMode(boolean multipleMode)
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{
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this.multipleMode = multipleMode;
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if (peer != null)
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{
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ListPeer l = (ListPeer) peer;
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l.setMultipleMode (multipleMode);
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}
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}
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/*************************************************************************/
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/**
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* This method enables or disables multiple selection mode for this
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* list.
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*
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* @param multipleMode <code>true</code> to enable multiple mode,
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* <code>false</code> otherwise.
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*/
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public void
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setMultipleSelections(boolean multipleMode)
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{
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setMultipleMode(multipleMode);
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}
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/*************************************************************************/
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/**
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* Returns the minimum size of this component.
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*
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* @return The minimum size of this component.
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*/
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public Dimension
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getMinimumSize()
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{
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return(getMinimumSize(rows));
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}
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/*************************************************************************/
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/**
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* Returns the minimum size of this component.
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*
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* @return The minimum size of this component.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getMinimumSize</code>.
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*/
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public Dimension
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minimumSize()
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{
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return(getMinimumSize(rows));
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}
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/*************************************************************************/
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/**
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* Returns the minimum size of this component assuming it had the specified
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* number of rows.
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*
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* @param rows The number of rows to size for.
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*
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* @return The minimum size of this component.
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*/
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public Dimension
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getMinimumSize(int rows)
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{
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ListPeer lp = (ListPeer)getPeer();
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if (lp != null)
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return(lp.minimumSize(rows));
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else
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return(new Dimension(0,0));
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}
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/*************************************************************************/
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/**
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* Returns the minimum size of this component assuming it had the specified
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* number of rows.
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*
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* @param rows The number of rows to size for.
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*
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* @return The minimum size of this component.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getMinimumSize(int)</code>>
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*/
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public Dimension
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minimumSize(int rows)
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{
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return(getMinimumSize(rows));
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}
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/*************************************************************************/
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/**
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* Returns the preferred size of this component.
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*
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* @return The preferred size of this component.
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*/
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public Dimension
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getPreferredSize()
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{
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return(getPreferredSize(rows));
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}
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/*************************************************************************/
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/**
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* Returns the preferred size of this component.
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*
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* @return The preferred size of this component.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getPreferredSize</code>.
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*/
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public Dimension
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preferredSize()
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{
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return(getPreferredSize(rows));
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}
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/*************************************************************************/
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/**
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* Returns the preferred size of this component assuming it had the specified
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* number of rows.
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*
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* @param rows The number of rows to size for.
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*
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* @return The preferred size of this component.
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*/
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public Dimension
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getPreferredSize(int rows)
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{
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ListPeer lp = (ListPeer)getPeer();
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if (lp != null)
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return(lp.preferredSize(rows));
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else
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return(new Dimension(0,0));
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}
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/*************************************************************************/
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/**
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* Returns the preferred size of this component assuming it had the specified
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* number of rows.
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*
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* @param rows The number of rows to size for.
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*
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* @return The preferred size of this component.
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*
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* @deprecated This method is deprecated in favor of
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* <code>getPreferredSize(int)</code>>
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*/
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public Dimension
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preferredSize(int rows)
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{
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return(getPreferredSize(rows));
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}
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/*************************************************************************/
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/**
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* This method adds the specified item to the end of the list.
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*
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* @param item The item to add to the list.
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*/
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public void
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add(String item)
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{
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add(item, -1);
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}
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/*************************************************************************/
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/**
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* This method adds the specified item to the end of the list.
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*
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* @param item The item to add to the list.
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*
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* @deprecated Use add() instead.
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*/
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public void
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addItem(String item)
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{
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addItem(item, -1);
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}
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/*************************************************************************/
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/**
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* Adds the specified item to the specified location in the list.
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* If the desired index is -1 or greater than the number of rows
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* in the list, then the item is added to the end.
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*
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* @param item The item to add to the list.
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* @param index The location in the list to add the item, or -1 to add
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* to the end.
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*/
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public void
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add(String item, int index)
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{
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if ((index == -1) || (index >= items.size()))
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items.addElement(item);
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else
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items.insertElementAt(item, index);
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if (peer != null)
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{
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ListPeer l = (ListPeer) peer;
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l.add (item, index);
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}
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}
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/*************************************************************************/
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/**
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* Adds the specified item to the specified location in the list.
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* If the desired index is -1 or greater than the number of rows
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* in the list, then the item is added to the end.
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*
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* @param item The item to add to the list.
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* @param index The location in the list to add the item, or -1 to add
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* to the end.
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*
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* @deprecated Use add() instead.
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*/
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public void
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addItem(String item, int index)
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{
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add(item, index);
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}
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/*************************************************************************/
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/**
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* Deletes the item at the specified index.
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*
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* @param index The index of the item to delete.
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*
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* @exception IllegalArgumentException If the index is not valid
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*/
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public void
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delItem(int index) throws IllegalArgumentException
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{
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remove(index);
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}
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/*************************************************************************/
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/**
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* Deletes the item at the specified index.
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*
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* @param index The index of the item to delete.
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*
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* @exception IllegalArgumentException If the index is not valid
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*/
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public void
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remove(int index) throws IllegalArgumentException
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{
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items.removeElementAt (index);
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if (peer != null)
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{
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ListPeer l = (ListPeer) peer;
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l.delItems (index, index);
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}
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}
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/*************************************************************************/
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/**
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* Deletes all items in the specified index range.
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*
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* @param start The beginning index of the range to delete.
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* @param end The ending index of the range to delete.
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*
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* @exception IllegalArgumentException If the indexes are not valid
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*
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* @deprecated This method is deprecated for some unknown reason.
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*/
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public synchronized void
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delItems(int start, int end) throws IllegalArgumentException
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{
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if ((start < 0) || (start >= items.size()))
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throw new IllegalArgumentException("Bad list start index value: " + start);
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if ((start < 0) || (start >= items.size()))
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throw new IllegalArgumentException("Bad list start index value: " + start);
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if (start > end)
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throw new IllegalArgumentException("Start is greater than end!");
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// We must run the loop in reverse direction.
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for (int i = end; i >= start; --i)
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items.removeElementAt (i);
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if (peer != null)
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{
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ListPeer l = (ListPeer) peer;
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l.delItems (start, end);
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}
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}
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/*************************************************************************/
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/**
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* Deletes the first occurrence of the specified item from the list.
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*
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* @param item The item to delete.
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*
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* @exception IllegalArgumentException If the specified item does not exist.
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*/
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public synchronized void
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remove(String item) throws IllegalArgumentException
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{
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int index = items.indexOf(item);
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if (index == -1)
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throw new IllegalArgumentException("List element to delete not found");
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remove(index);
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}
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/*************************************************************************/
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/**
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* Deletes all of the items from the list.
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*/
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public synchronized void
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removeAll()
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{
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items.clear();
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if (peer != null)
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{
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ListPeer l = (ListPeer) peer;
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l.removeAll ();
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}
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}
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/*************************************************************************/
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/**
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* Deletes all of the items from the list.
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*
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* @deprecated This method is deprecated in favor of <code>removeAll()</code>.
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*/
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public void
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clear()
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{
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removeAll();
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}
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/*************************************************************************/
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/**
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* Replaces the item at the specified index with the specified item.
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*
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* @param item The new item value.
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* @param index The index of the item to replace.
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*
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* @exception IllegalArgumentException If the index is not valid.
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*/
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public synchronized void
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replaceItem(String item, int index) throws IllegalArgumentException
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{
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remove(index);
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addItem(item, index);
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}
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/*************************************************************************/
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/**
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* Returns the index of the currently selected item. -1 will be returned
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* if there are no selected rows or if there are multiple selected rows.
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*
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* @return The index of the selected row.
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*/
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public synchronized int
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getSelectedIndex()
|
|
{
|
|
if (peer != null)
|
|
{
|
|
ListPeer l = (ListPeer) peer;
|
|
selected = l.getSelectedIndexes ();
|
|
}
|
|
|
|
if (selected == null || selected.length > 1)
|
|
return -1;
|
|
return selected[0];
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns an array containing the indexes of the rows that are
|
|
* currently selected.
|
|
*
|
|
* @return A list of indexes of selected rows.
|
|
*/
|
|
public synchronized int[]
|
|
getSelectedIndexes()
|
|
{
|
|
if (peer != null)
|
|
{
|
|
ListPeer l = (ListPeer) peer;
|
|
selected = l.getSelectedIndexes ();
|
|
}
|
|
return selected;
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the item that is currently selected, or <code>null</code> if there
|
|
* is no item selected. FIXME: What happens if multiple items selected?
|
|
*
|
|
* @return The selected item, or <code>null</code> if there is no
|
|
* selected item.
|
|
*/
|
|
public synchronized String
|
|
getSelectedItem()
|
|
{
|
|
int index = getSelectedIndex();
|
|
if (index == -1)
|
|
return(null);
|
|
|
|
return((String)items.elementAt(index));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the list of items that are currently selected in this list.
|
|
*
|
|
* @return The list of currently selected items.
|
|
*/
|
|
public synchronized String[]
|
|
getSelectedItems()
|
|
{
|
|
int[] indexes = getSelectedIndexes();
|
|
if (indexes == null)
|
|
return(new String[0]);
|
|
|
|
String[] retvals = new String[indexes.length];
|
|
if (retvals.length > 0)
|
|
for (int i = 0 ; i < retvals.length; i++)
|
|
retvals[i] = (String)items.elementAt(indexes[i]);
|
|
|
|
return(retvals);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the list of items that are currently selected in this list as
|
|
* an array of type <code>Object[]</code> instead of <code>String[]</code>.
|
|
*
|
|
* @return The list of currently selected items.
|
|
*/
|
|
public synchronized Object[]
|
|
getSelectedObjects()
|
|
{
|
|
int[] indexes = getSelectedIndexes();
|
|
if (indexes == null)
|
|
return(new Object[0]);
|
|
|
|
Object[] retvals = new Object[indexes.length];
|
|
if (retvals.length > 0)
|
|
for (int i = 0 ; i < retvals.length; i++)
|
|
retvals[i] = items.elementAt(indexes[i]);
|
|
|
|
return(retvals);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Tests whether or not the specified index is selected.
|
|
*
|
|
* @param index The index to test.
|
|
*
|
|
* @return <code>true</code> if the index is selected, <code>false</code>
|
|
* otherwise.
|
|
*/
|
|
public boolean
|
|
isIndexSelected(int index)
|
|
{
|
|
int[] indexes = getSelectedIndexes();
|
|
|
|
for (int i = 0; i < indexes.length; i++)
|
|
if (indexes[i] == index)
|
|
return(true);
|
|
|
|
return(false);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Tests whether or not the specified index is selected.
|
|
*
|
|
* @param index The index to test.
|
|
*
|
|
* @return <code>true</code> if the index is selected, <code>false</code>
|
|
* otherwise.
|
|
*
|
|
* @deprecated This method is deprecated in favor of
|
|
* <code>isIndexSelected(int)</code>.
|
|
*/
|
|
public boolean
|
|
isSelected(int index)
|
|
{
|
|
return(isIndexSelected(index));
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method ensures that the item at the specified index is visible.
|
|
*
|
|
* @exception IllegalArgumentException If the specified index is out of
|
|
* range.
|
|
*/
|
|
public synchronized void
|
|
makeVisible(int index) throws IllegalArgumentException
|
|
{
|
|
if ((index < 0) || (index >= items.size()))
|
|
throw new IllegalArgumentException("Bad list index: " + index);
|
|
|
|
visibleIndex = index;
|
|
if (peer != null)
|
|
{
|
|
ListPeer l = (ListPeer) peer;
|
|
l.makeVisible (index);
|
|
}
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns the index of the last item that was made visible via the
|
|
* <code>makeVisible()</code> method.
|
|
*
|
|
* @return The index of the last item made visible via the
|
|
* <code>makeVisible()</code> method.
|
|
*/
|
|
public int
|
|
getVisibleIndex()
|
|
{
|
|
return(visibleIndex);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Makes the item at the specified index selected.
|
|
*
|
|
* @param index The index of the item to select.
|
|
*/
|
|
public synchronized void
|
|
select(int index)
|
|
{
|
|
ListPeer lp = (ListPeer)getPeer();
|
|
if (lp != null)
|
|
lp.select(index);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Makes the item at the specified index not selected.
|
|
*
|
|
* @param index The index of the item to unselect.
|
|
*/
|
|
public synchronized void
|
|
deselect(int index)
|
|
{
|
|
ListPeer lp = (ListPeer)getPeer();
|
|
if (lp != null)
|
|
lp.deselect(index);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Notifies this object to create its native peer.
|
|
*/
|
|
public void
|
|
addNotify()
|
|
{
|
|
if (peer == null)
|
|
peer = getToolkit ().createList (this);
|
|
super.addNotify ();
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Notifies this object to destroy its native peer.
|
|
*/
|
|
public void
|
|
removeNotify()
|
|
{
|
|
super.removeNotify();
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Adds the specified <code>ActionListener</code> to the list of
|
|
* registered listeners for this object.
|
|
*
|
|
* @param listener The listener to add.
|
|
*/
|
|
public synchronized void
|
|
addActionListener(ActionListener listener)
|
|
{
|
|
action_listeners = AWTEventMulticaster.add(action_listeners, listener);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Removes the specified <code>ActionListener</code> from the list of
|
|
* registers listeners for this object.
|
|
*
|
|
* @param listener The listener to remove.
|
|
*/
|
|
public synchronized void
|
|
removeActionListener(ActionListener listener)
|
|
{
|
|
action_listeners = AWTEventMulticaster.remove(action_listeners, listener);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Adds the specified <code>ItemListener</code> to the list of
|
|
* registered listeners for this object.
|
|
*
|
|
* @param listener The listener to add.
|
|
*/
|
|
public synchronized void
|
|
addItemListener(ItemListener listener)
|
|
{
|
|
item_listeners = AWTEventMulticaster.add(item_listeners, listener);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Removes the specified <code>ItemListener</code> from the list of
|
|
* registers listeners for this object.
|
|
*
|
|
* @param listener The listener to remove.
|
|
*/
|
|
public synchronized void
|
|
removeItemListener(ItemListener listener)
|
|
{
|
|
item_listeners = AWTEventMulticaster.remove(item_listeners, listener);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Processes the specified event for this object. If the event is an
|
|
* instance of <code>ActionEvent</code> then the
|
|
* <code>processActionEvent()</code> method is called. Similarly, if the
|
|
* even is an instance of <code>ItemEvent</code> then the
|
|
* <code>processItemEvent()</code> method is called. Otherwise the
|
|
* superclass method is called to process this event.
|
|
*
|
|
* @param event The event to process.
|
|
*/
|
|
protected void
|
|
processEvent(AWTEvent event)
|
|
{
|
|
if (event instanceof ActionEvent)
|
|
processActionEvent((ActionEvent)event);
|
|
if (event instanceof ItemEvent)
|
|
processItemEvent((ItemEvent)event);
|
|
|
|
super.processEvent(event);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method processes the specified event by dispatching it to any
|
|
* registered listeners. Note that this method will only get called if
|
|
* action events are enabled. This will happen automatically if any
|
|
* listeners are added, or it can be done "manually" by calling
|
|
* the <code>enableEvents()</code> method.
|
|
*
|
|
* @param event The event to process.
|
|
*/
|
|
protected void
|
|
processActionEvent(ActionEvent event)
|
|
{
|
|
if (action_listeners != null)
|
|
action_listeners.actionPerformed(event);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* This method processes the specified event by dispatching it to any
|
|
* registered listeners. Note that this method will only get called if
|
|
* item events are enabled. This will happen automatically if any
|
|
* listeners are added, or it can be done "manually" by calling
|
|
* the <code>enableEvents()</code> method.
|
|
*
|
|
* @param event The event to process.
|
|
*/
|
|
protected void
|
|
processItemEvent(ItemEvent event)
|
|
{
|
|
if (item_listeners != null)
|
|
item_listeners.itemStateChanged(event);
|
|
}
|
|
|
|
/*************************************************************************/
|
|
|
|
/**
|
|
* Returns a debugging string for this object.
|
|
*
|
|
* @return A debugging string for this object.
|
|
*/
|
|
protected String
|
|
paramString()
|
|
{
|
|
return "multiple=" + multipleMode + ",rows=" + rows + super.paramString();
|
|
}
|
|
|
|
} // class List
|