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1: /* ButtonGroup.java -- 2: Copyright (C) 2002 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package javax.swing; 39: 40: import java.io.Serializable; 41: import java.util.Enumeration; 42: import java.util.Vector; 43: 44: 45: /** 46: * DOCUMENT ME! 47: */ 48: public class ButtonGroup implements Serializable 49: { 50: /** DOCUMENT ME! */ 51: private static final long serialVersionUID = 4259076101881721375L; 52: 53: /** The buttons added to this button group. */ 54: protected Vector buttons = new Vector(); 55: 56: /** The currently selected button model. */ 57: ButtonModel sel; 58: 59: /** 60: * Creates a new button group. 61: */ 62: public ButtonGroup() 63: { 64: } 65: 66: /** 67: * Adds a button to this group. 68: * 69: * @param b the button to add 70: */ 71: public void add(AbstractButton b) 72: { 73: b.getModel().setGroup(this); 74: buttons.addElement(b); 75: } 76: 77: /** 78: * Removed a given button from this group. 79: * 80: * @param b the button to remove 81: */ 82: public void remove(AbstractButton b) 83: { 84: b.getModel().setGroup(null); 85: buttons.removeElement(b); 86: } 87: 88: /** 89: * Returns the currently added buttons. 90: * 91: * @return <code>Enumeration</code> over all added buttons 92: */ 93: public Enumeration getElements() 94: { 95: return buttons.elements(); 96: } 97: 98: /** 99: * Returns the currently selected button model. 100: * 101: * @return the currently selected button model, null if none was selected 102: * yet 103: */ 104: public ButtonModel getSelection() 105: { 106: return sel; 107: } 108: 109: /** 110: * DOCUMENT ME! 111: * 112: * @param m DOCUMENT ME! 113: * 114: * @return DOCUMENT ME! 115: */ 116: AbstractButton FindButton(ButtonModel m) 117: { 118: for (int i = 0; i < buttons.size(); i++) 119: { 120: AbstractButton a = (AbstractButton) buttons.get(i); 121: if (a.getModel() == m) 122: return a; 123: } 124: return null; 125: } 126: 127: /** 128: * Sets the currently selected button model. Only one button of a group can 129: * be selected at a time. 130: * 131: * @param m the model to select 132: * @param b true if this button is to be selected, false otherwise 133: */ 134: public void setSelected(ButtonModel m, boolean b) 135: { 136: if ((sel != m || b) && (! b || sel == m)) 137: return; 138: 139: if (b && sel != m) 140: { 141: ButtonModel old = sel; 142: sel = m; 143: 144: if (old != null) 145: old.setSelected(false); 146: AbstractButton button = FindButton(old); 147: if (button != null) 148: button.repaint(); 149: } 150: else if (!b && sel == m) 151: m.setSelected(true); 152: } 153: 154: /** 155: * Checks if the given <code>ButtonModel</code> is selected in this button 156: * group. 157: * 158: * @param m DOCUMENT ME! 159: * 160: * @return true of given <code>ButtonModel</code> is selected, false 161: * otherwise 162: */ 163: public boolean isSelected(ButtonModel m) 164: { 165: return m == sel; 166: } 167: 168: /** 169: * Return the number of buttons in this button group. 170: * 171: * @return the number of buttons 172: * 173: * @since 1.3 174: */ 175: public int getButtonCount() 176: { 177: return buttons.size(); 178: } 179: }
GNU Classpath (0.17) |