J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.swing; |
| 27 | |
| 28 | import java.util.EventObject; |
| 29 | import javax.swing.event.*; |
| 30 | |
| 31 | /** |
| 32 | * This interface defines the methods any general editor should be able |
| 33 | * to implement. <p> |
| 34 | * |
| 35 | * Having this interface enables complex components (the client of the |
| 36 | * editor) such as <code>JTree</code> and |
| 37 | * <code>JTable</code> to allow any generic editor to |
| 38 | * edit values in a table cell, or tree cell, etc. Without this generic |
| 39 | * editor interface, <code>JTable</code> would have to know about specific editors, |
| 40 | * such as <code>JTextField</code>, <code>JCheckBox</code>, <code>JComboBox</code>, |
| 41 | * etc. In addition, without this interface, clients of editors such as |
| 42 | * <code>JTable</code> would not be able |
| 43 | * to work with any editors developed in the future by the user |
| 44 | * or a 3rd party ISV. <p> |
| 45 | * |
| 46 | * To use this interface, a developer creating a new editor can have the |
| 47 | * new component implement the interface. Or the developer can |
| 48 | * choose a wrapper based approach and provide a companion object which |
| 49 | * implements the <code>CellEditor</code> interface (See |
| 50 | * <code>JCellEditor</code> for example). The wrapper approach |
| 51 | * is particularly useful if the user want to use a 3rd party ISV |
| 52 | * editor with <code>JTable</code>, but the ISV didn't implement the |
| 53 | * <code>CellEditor</code> interface. The user can simply create an object |
| 54 | * that contains an instance of the 3rd party editor object and "translate" |
| 55 | * the <code>CellEditor</code> API into the 3rd party editor's API. |
| 56 | * |
| 57 | * @see javax.swing.event.CellEditorListener |
| 58 | * |
| 59 | * @author Alan Chung |
| 60 | */ |
| 61 | public interface CellEditor { |
| 62 | |
| 63 | /** |
| 64 | * Returns the value contained in the editor. |
| 65 | * @return the value contained in the editor |
| 66 | */ |
| 67 | public Object getCellEditorValue(); |
| 68 | |
| 69 | /** |
| 70 | * Asks the editor if it can start editing using <code>anEvent</code>. |
| 71 | * <code>anEvent</code> is in the invoking component coordinate system. |
| 72 | * The editor can not assume the Component returned by |
| 73 | * <code>getCellEditorComponent</code> is installed. This method |
| 74 | * is intended for the use of client to avoid the cost of setting up |
| 75 | * and installing the editor component if editing is not possible. |
| 76 | * If editing can be started this method returns true. |
| 77 | * |
| 78 | * @param anEvent the event the editor should use to consider |
| 79 | * whether to begin editing or not |
| 80 | * @return true if editing can be started |
| 81 | * @see #shouldSelectCell |
| 82 | */ |
| 83 | public boolean isCellEditable(EventObject anEvent); |
| 84 | |
| 85 | /** |
| 86 | * Returns true if the editing cell should be selected, false otherwise. |
| 87 | * Typically, the return value is true, because is most cases the editing |
| 88 | * cell should be selected. However, it is useful to return false to |
| 89 | * keep the selection from changing for some types of edits. |
| 90 | * eg. A table that contains a column of check boxes, the user might |
| 91 | * want to be able to change those checkboxes without altering the |
| 92 | * selection. (See Netscape Communicator for just such an example) |
| 93 | * Of course, it is up to the client of the editor to use the return |
| 94 | * value, but it doesn't need to if it doesn't want to. |
| 95 | * |
| 96 | * @param anEvent the event the editor should use to start |
| 97 | * editing |
| 98 | * @return true if the editor would like the editing cell to be selected; |
| 99 | * otherwise returns false |
| 100 | * @see #isCellEditable |
| 101 | */ |
| 102 | public boolean shouldSelectCell(EventObject anEvent); |
| 103 | |
| 104 | /** |
| 105 | * Tells the editor to stop editing and accept any partially edited |
| 106 | * value as the value of the editor. The editor returns false if |
| 107 | * editing was not stopped; this is useful for editors that validate |
| 108 | * and can not accept invalid entries. |
| 109 | * |
| 110 | * @return true if editing was stopped; false otherwise |
| 111 | */ |
| 112 | public boolean stopCellEditing(); |
| 113 | |
| 114 | /** |
| 115 | * Tells the editor to cancel editing and not accept any partially |
| 116 | * edited value. |
| 117 | */ |
| 118 | public void cancelCellEditing(); |
| 119 | |
| 120 | /** |
| 121 | * Adds a listener to the list that's notified when the editor |
| 122 | * stops, or cancels editing. |
| 123 | * |
| 124 | * @param l the CellEditorListener |
| 125 | */ |
| 126 | public void addCellEditorListener(CellEditorListener l); |
| 127 | |
| 128 | /** |
| 129 | * Removes a listener from the list that's notified |
| 130 | * |
| 131 | * @param l the CellEditorListener |
| 132 | */ |
| 133 | public void removeCellEditorListener(CellEditorListener l); |
| 134 | } |