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CellEditor.java
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1998-06-30
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/*
* @(#)CellEditor.java 1.9 98/02/05
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
/**
* This interface defines the methods any general editor should be able
* to implement. <p>
*
* Having this interface enables complex components (the client of the
* editor) such as JList, JTree, and JTable to allow any generic editor to
* edit values in a table cell, or tree cell, etc. Without this generic
* editor interface, JTable would have to know about specific editors,
* such as JTextField, JCheckBox, JComboBox, etc. In addition, without
* this interface, clients of editors such as JTable would not be able
* to work with any editors developed in the future by the user
* or a 3rd party ISV. <p>
*
* To use this interface, a developer creating a new editor can have the
* new component implement the interface. Or the developer can
* choose a wrapper based approch and provide a companion object which
* implements the CellEditor interface (See JCellEditor for example). The
* wrapper approch is particularly useful if the user want to use a
* 3rd party ISV editor with JTable, but the ISV didn't implement the
* CellEditor interface. The user can simply create an object that
* contains an instance of the 3rd party editor object and "translate"
* the CellEditor API into the 3rd party editor's API.
*
* @version 1.9 02/05/98
* @author Alan Chung
* @see event.CellEditorListener
*/
import java.util.EventObject;
import com.sun.java.swing.*;
import com.sun.java.swing.event.*;
public interface CellEditor {
/** Returns the value contained in the editor**/
public Object getCellEditorValue();
/**
* Ask the editor if it can start editing using <I>anEvent</I>.
* <I>anEvent</I> is in the invoking component coordinate system.
* The editor can not assume the Component returned by
* getCellEditorComponent() is installed. This method is intended
* for the use of client to avoid the cost of setting up and installing
* the editor component if editing is not possible.
* If editing can be started this method returns true.
*
* @param anEvent the event the editor should use to consider
* whether to begin editing or not.
* @return true if editing can be started.
* @see #shouldSelectCell()
*/
public boolean isCellEditable(EventObject anEvent);
/**
* Tell the editor to start editing using <I>anEvent</I>. It is
* up to the editor if it want to start editing in different states
* depending on the exact type of <I>anEvent</I>. For example, with
* a text field editor, if the event is a mouse event the editor
* might start editing with the cursor at the clicked point. If
* the event is a keyboard event, it might want replace the value
* of the text field with that first key, etc. <I>anEvent</I>
* is in the invoking component's coordinate system. A null value
* is a valid parameter for <I>anEvent</I>, and it is up to the editor
* to determine what is the default starting state. For example,
* a text field editor might want to select all the text and start
* editing if <I>anEvent</I> is null. The editor can assume
* the Component returned by getCellEditorComponent() is properly
* installed in the clients Component hierarchy before this method is
* called. <p>
*
* The return value of shouldSelectCell() is a boolean indicating whether
* the editing cell should be selected or not. Typically, the return
* value is true, because is most cases the editing cell should be
* selected. However, it is useful to return false to keep the selection
* from changing for some types of edits. eg. A table that contains
* a column of check boxes, the user might want to be able to change
* those checkboxes without altering the selection. (See Netscape
* Communicator for just such an example) Of course, it is up to
* the client of the editor to use the return value, but it doesn't
* need to if it doesn't want to.
*
* @param anEvent the event the editor should use to start
* editing.
* @return true if the editor would like the editing cell to be selected
* @see #isCellEditable()
*/
public boolean shouldSelectCell(EventObject anEvent);
/**
* Tell the editor to stop editing and accept any partially edited
* value as the value of the editor. The editor returns false if
* editing was not stopped, useful for editors which validates and
* can not accept invalid entries.
*
* @return true if editing was stopped
*/
public boolean stopCellEditing();
/**
* Tell the editor to cancel editing and not accept any partially
* edited value.
*/
public void cancelCellEditing();
/**
* Add a listener to the list that's notified when the editor starts,
* stops, or cancels editing.
*
* @param l the CellEditorListener
*/
public void addCellEditorListener(CellEditorListener l);
/**
* Remove a listener from the list that's notified
*
* @param l the CellEditorListener
*/
public void removeCellEditorListener(CellEditorListener l);
}