mirror of git://gcc.gnu.org/git/gcc.git
448 lines
10 KiB
Java
448 lines
10 KiB
Java
/* Choice.java -- Java choice button widget.
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Copyright (C) 1999, 2000, 2001, 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.awt.peer.ChoicePeer;
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import java.awt.peer.ComponentPeer;
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import java.awt.event.ItemEvent;
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import java.awt.event.ItemListener;
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import java.io.Serializable;
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import java.util.Vector;
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/**
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* This class implements a drop down choice list.
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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 Choice 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 = -4075310674757313071L;
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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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* @serial A list of items for the choice box, which can be <code>null</code>.
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*/
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private Vector pItems = new Vector();
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/**
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* @serial The index of the selected item in the choice box.
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*/
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private int selectedIndex = -1;
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// Listener chain
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private ItemListener item_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>Choice</code>.
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*/
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public
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Choice()
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{
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* Returns the number of items in the list.
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*
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* @return The number of items in the 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(pItems.size());
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}
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/*************************************************************************/
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/**
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* Returns the number of items in the list.
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*
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* @return The number of items in the list.
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*
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* @deprecated This method is deprecated in favor of <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(pItems.size());
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}
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/*************************************************************************/
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/**
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* Returns the item at the specified index in the list.
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*
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* @param index The index into the list to return the item from.
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*
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* @exception ArrayIndexOutOfBoundsException If the index is invalid.
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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)pItems.elementAt(index));
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}
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/*************************************************************************/
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/**
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* Adds the specified item to this choice box.
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*
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* @param item The item to add.
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*/
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public synchronized void
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add(String item)
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{
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if (item == null)
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throw new IllegalArgumentException ("item must be non-null");
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pItems.addElement(item);
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int i = pItems.size () - 1;
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if (peer != null)
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{
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ChoicePeer cp = (ChoicePeer) peer;
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cp.add (item, i);
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}
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if (i == 0)
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select (0);
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}
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/*************************************************************************/
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/**
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* Adds the specified item to this choice box.
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*
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* @param item The item to add.
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*/
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public synchronized void
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addItem(String item)
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{
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add(item);
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}
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/*************************************************************************/
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/** Inserts an item into this Choice. Existing items are shifted
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* upwards. If the new item is the only item, then it is selected.
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* If the currently selected item is shifted, then the first item is
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* selected. If the currently selected item is not shifted, then it
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* remains selected.
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*
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* @param item The item to add.
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* @param index The index at which the item should be inserted.
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*/
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public synchronized void
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insert(String item, int index)
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{
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if (index > getItemCount ())
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index = getItemCount ();
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pItems.insertElementAt(item, index);
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if (peer != null)
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{
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ChoicePeer cp = (ChoicePeer) peer;
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cp.add (item, index);
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}
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if (getItemCount () == 1 || selectedIndex >= index)
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select (0);
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}
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/*************************************************************************/
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/**
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* Removes the specified item from the choice box.
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*
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* @param item The item to remove.
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*
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* @param IllegalArgumentException If the specified item doesn't exist.
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*/
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public synchronized void
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remove(String item)
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{
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int index = pItems.indexOf(item);
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if (index == -1)
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throw new IllegalArgumentException ("item \""
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+ item + "\" not found in Choice");
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remove(index);
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}
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/*************************************************************************/
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/**
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* Removes the item at the specified index from the choice box.
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*
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* @param index The index of the item to remove.
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*
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* @exception ArrayIndexOutOfBoundException If the index is not valid.
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*/
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public synchronized void
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remove(int index)
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{
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pItems.removeElementAt(index);
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if (peer != null)
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{
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ChoicePeer cp = (ChoicePeer) peer;
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cp.remove (index);
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}
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if (index == selectedIndex)
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select (0);
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else if (selectedIndex > index)
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--selectedIndex;
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}
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/*************************************************************************/
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/**
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* Removes all of the objects from this choice box.
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*/
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public synchronized void
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removeAll()
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{
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int count = getItemCount();
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for (int i = 0; i < count; i++)
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{
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// Always remove 0.
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remove(0);
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}
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}
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/*************************************************************************/
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/**
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* Returns the currently selected item, or null if no item is
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* selected.
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*
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* @return The currently selected item.
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*/
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public synchronized String
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getSelectedItem()
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{
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return (selectedIndex == -1
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? null
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: ((String)pItems.elementAt(selectedIndex)));
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}
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/*************************************************************************/
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/**
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* Returns an array with one row containing the selected item.
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*
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* @return An array containing the selected item.
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*/
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public synchronized Object[]
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getSelectedObjects()
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{
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if (selectedIndex == -1)
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return null;
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Object[] objs = new Object[1];
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objs[0] = pItems.elementAt(selectedIndex);
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return(objs);
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}
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/*************************************************************************/
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/**
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* Returns the index of the selected item.
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*
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* @return The index of the selected item.
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*/
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public int
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getSelectedIndex()
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{
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return(selectedIndex);
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}
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/*************************************************************************/
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/**
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* Forces the item at the specified index to be selected.
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*
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* @param index The index of the row to make selected.
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*
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* @param IllegalArgumentException If the specified index is invalid.
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*/
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public synchronized void
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select(int index)
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{
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if ((index < 0) || (index > getItemCount()))
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throw new IllegalArgumentException("Bad index: " + index);
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this.selectedIndex = index;
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if (peer != null)
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{
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ChoicePeer cp = (ChoicePeer) peer;
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cp.select (index);
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}
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}
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/*************************************************************************/
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/**
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* Forces the named item to be selected.
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*
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* @param item The item to be selected.
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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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select(String item)
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{
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int index = pItems.indexOf(item);
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if (index >= 0)
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select(index);
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}
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/*************************************************************************/
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/**
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* Creates the native peer for this object.
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*/
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public void
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addNotify()
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{
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if (peer == null)
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peer = getToolkit ().createChoice (this);
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super.addNotify ();
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}
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/*************************************************************************/
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/**
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* Adds the specified listener to the list of registered listeners for
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* this object.
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*
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* @param listener The listener to add.
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*/
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public synchronized void
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addItemListener(ItemListener listener)
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{
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item_listeners = AWTEventMulticaster.add(item_listeners, listener);
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}
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/*************************************************************************/
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/**
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* Removes the specified listener from the list of registered listeners for
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* this object.
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*
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* @param listener The listener to remove.
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*/
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public synchronized void
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removeItemListener(ItemListener listener)
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{
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item_listeners = AWTEventMulticaster.remove(item_listeners, listener);
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}
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/*************************************************************************/
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/**
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* Processes this event by invoking <code>processItemEvent()</code> if the
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* event is an instance of <code>ItemEvent</code>, otherwise the event
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* is passed to the superclass.
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*
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* @param event The event to process.
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*/
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protected void
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processEvent(AWTEvent event)
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{
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if (event instanceof ItemEvent)
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processItemEvent((ItemEvent)event);
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else
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super.processEvent(event);
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}
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/*************************************************************************/
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/**
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* Processes item event by dispatching to any registered listeners.
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*
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* @param event The event to process.
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*/
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protected void
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processItemEvent(ItemEvent event)
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{
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if (item_listeners != null)
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item_listeners.itemStateChanged(event);
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}
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/*************************************************************************/
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/**
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* Returns a debugging string for this object.
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*
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* @return A debugging string for this object.
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*/
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protected String
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paramString()
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{
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return ("selectedIndex=" + selectedIndex + "," + super.paramString());
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}
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} // class Choice
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