001 /* Action.java -- 002 Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package javax.swing; 039 040 import java.awt.event.ActionListener; 041 import java.beans.PropertyChangeListener; 042 043 /** 044 * Provides a convenient central point of control for some task 045 * that can be triggered by more than one control in a Swing user interface 046 * (for example, a menu item and a toolbar button). 047 * 048 * @see AbstractButton#setAction(Action) 049 * 050 * @author Ronald Veldema (rveldema@cs.vu.nl) 051 * @author Andrew Selkirk 052 */ 053 public interface Action extends ActionListener { 054 055 /** 056 * A key to access the default property for the action (this is not used). 057 */ 058 String DEFAULT = "Default"; 059 060 /** 061 * A key to access the long description for the action. 062 */ 063 String LONG_DESCRIPTION = "LongDescription"; 064 065 /** 066 * A key to access the name for the action. 067 */ 068 String NAME = "Name"; 069 070 /** 071 * A key to access the short description for the action (the short 072 * description is typically used as the tool tip text). 073 */ 074 String SHORT_DESCRIPTION = "ShortDescription"; 075 076 /** 077 * A key to access the icon for the action. 078 */ 079 String SMALL_ICON = "SmallIcon"; 080 081 /** 082 * A key to access the {@link KeyStroke} used as the accelerator for the 083 * action. 084 */ 085 String ACCELERATOR_KEY = "AcceleratorKey"; 086 087 /** 088 * A key to access the action command string for the action. 089 */ 090 String ACTION_COMMAND_KEY = "ActionCommandKey"; 091 092 /** 093 * A key to access the mnemonic for the action. 094 */ 095 String MNEMONIC_KEY = "MnemonicKey"; 096 097 /** 098 * Returns the value associated with the specified key. 099 * 100 * @param key the key (not <code>null</code>). 101 * 102 * @return The value associated with the specified key, or 103 * <code>null</code> if the key is not found. 104 */ 105 Object getValue(String key); 106 107 /** 108 * Sets the value associated with the specified key and sends a 109 * {@link java.beans.PropertyChangeEvent} to all registered listeners. 110 * The standard keys are defined in this interface: {@link #NAME}, 111 * {@link #SHORT_DESCRIPTION}, {@link #LONG_DESCRIPTION}, 112 * {@link #SMALL_ICON}, {@link #ACTION_COMMAND_KEY}, 113 * {@link #ACCELERATOR_KEY} and {@link #MNEMONIC_KEY}. Any existing value 114 * associated with the key will be overwritten. 115 * 116 * @param key the key (not <code>null</code>). 117 * @param value the value (<code>null</code> permitted). 118 */ 119 void putValue(String key, Object value); 120 121 /** 122 * Returns the flag that indicates whether or not this action is enabled. 123 * 124 * @return The flag. 125 */ 126 boolean isEnabled(); 127 128 /** 129 * Sets the flag that indicates whether or not this action is enabled. If 130 * the value changes, a {@link java.beans.PropertyChangeEvent} is sent to 131 * all registered listeners. 132 * 133 * @param b the new value of the flag. 134 */ 135 void setEnabled(boolean b); 136 137 /** 138 * Registers a listener to receive notification whenever one of the 139 * action's properties is modified. 140 * 141 * @param listener the listener. 142 */ 143 void addPropertyChangeListener(PropertyChangeListener listener); 144 145 /** 146 * Deregisters a listener so that it no longer receives notification of 147 * changes to the action's properties. 148 * 149 * @param listener the listener. 150 */ 151 void removePropertyChangeListener(PropertyChangeListener listener); 152 153 } // Action