| /* ButtonGroup.java -- |
| Copyright (C) 2002 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 |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 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 |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package javax.swing; |
| |
| import java.io.Serializable; |
| import java.util.Enumeration; |
| import java.util.Vector; |
| |
| |
| /** |
| * DOCUMENT ME! |
| */ |
| public class ButtonGroup implements Serializable |
| { |
| /** DOCUMENT ME! */ |
| private static final long serialVersionUID = 4259076101881721375L; |
| |
| /** The buttons added to this button group. */ |
| protected Vector buttons = new Vector(); |
| |
| /** The currently selected button model. */ |
| ButtonModel sel; |
| |
| /** |
| * Creates a new button group. |
| */ |
| public ButtonGroup() |
| { |
| } |
| |
| /** |
| * Adds a button to this group. |
| * |
| * @param b the button to add |
| */ |
| public void add(AbstractButton b) |
| { |
| b.getModel().setGroup(this); |
| buttons.addElement(b); |
| } |
| |
| /** |
| * Removed a given button from this group. |
| * |
| * @param b the button to remove |
| */ |
| public void remove(AbstractButton b) |
| { |
| b.getModel().setGroup(null); |
| buttons.removeElement(b); |
| } |
| |
| /** |
| * Returns the currently added buttons. |
| * |
| * @return <code>Enumeration</code> over all added buttons |
| */ |
| public Enumeration getElements() |
| { |
| return buttons.elements(); |
| } |
| |
| /** |
| * Returns the currently selected button model. |
| * |
| * @return the currently selected button model, null if none was selected |
| * yet |
| */ |
| public ButtonModel getSelection() |
| { |
| return sel; |
| } |
| |
| /** |
| * DOCUMENT ME! |
| * |
| * @param m DOCUMENT ME! |
| * |
| * @return DOCUMENT ME! |
| */ |
| AbstractButton FindButton(ButtonModel m) |
| { |
| for (int i = 0; i < buttons.size(); i++) |
| { |
| AbstractButton a = (AbstractButton) buttons.get(i); |
| if (a.getModel() == m) |
| return a; |
| } |
| return null; |
| } |
| |
| /** |
| * Sets the currently selected button model. Only one button of a group can |
| * be selected at a time. |
| * |
| * @param m the model to select |
| * @param b true if this button is to be selected, false otherwise |
| */ |
| public void setSelected(ButtonModel m, boolean b) |
| { |
| if ((sel != m || b) && (! b || sel == m)) |
| return; |
| |
| if (b && sel != m) |
| { |
| ButtonModel old = sel; |
| sel = m; |
| |
| if (old != null) |
| old.setSelected(false); |
| AbstractButton button = FindButton(old); |
| if (button != null) |
| button.repaint(); |
| } |
| else if (! b && sel == m) |
| m.setSelected(true); |
| } |
| |
| /** |
| * Checks if the given <code>ButtonModel</code> is selected in this button |
| * group. |
| * |
| * @param m DOCUMENT ME! |
| * |
| * @return true of given <code>ButtonModel</code> is selected, false |
| * otherwise |
| */ |
| public boolean isSelected(ButtonModel m) |
| { |
| return m == sel; |
| } |
| |
| /** |
| * Return the number of buttons in this button group. |
| * |
| * @return the number of buttons |
| * |
| * @since 1.3 |
| */ |
| public int getButtonCount() |
| { |
| return buttons.size(); |
| } |
| } |