API java : CellEditor

javax.swing
Interface CellEditor

All Known Subinterfaces:

TableCellEditor, TreeCellEditor

All Known Implementing Classes:

AbstractCellEditor, DefaultCellEditor, DefaultTreeCellEditor

public interface CellEditor

This interface defines the methods any general editor should be able to implement.

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.

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 approach and provide a companion object which implements the CellEditor interface (See JCellEditor for example). The wrapper approach 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.

See Also:

CellEditorListener

Method Summary
void	addCellEditorListener(CellEditorListener l)           Adds a listener to the list that's notified when the editor stops, or cancels editing.
void	cancelCellEditing()           Tells the editor to cancel editing and not accept any partially edited value.
Object	getCellEditorValue()           Returns the value contained in the editor.
boolean	isCellEditable(EventObject anEvent)           Asks the editor if it can start editing using anEvent.
void	removeCellEditorListener(CellEditorListener l)           Removes a listener from the list that's notified
boolean	shouldSelectCell(EventObject anEvent)           Returns true if the editing cell should be selected, false otherwise.
boolean	stopCellEditing()           Tells the editor to stop editing and accept any partially edited value as the value of the editor.

 

Method Detail

getCellEditorValue

Object getCellEditorValue()

Returns the value contained in the editor.

Returns:

the value contained in the editor

isCellEditable

boolean isCellEditable(EventObject anEvent)

Asks the editor if it can start editing using anEvent. anEvent 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.

Parameters:

anEvent - the event the editor should use to consider whether to begin editing or not

Returns:

true if editing can be started

See Also:

shouldSelectCell(java.util.EventObject)

shouldSelectCell

boolean shouldSelectCell(EventObject anEvent)

Returns true if the editing cell should be selected, false otherwise. 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.

Parameters:

anEvent - the event the editor should use to start editing

Returns:

true if the editor would like the editing cell to be selected; otherwise returns false

See Also:

isCellEditable(java.util.EventObject)

stopCellEditing

boolean stopCellEditing()

Tells 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; this is useful for editors that validate and can not accept invalid entries.

Returns:

true if editing was stopped; false otherwise

cancelCellEditing

void cancelCellEditing()

Tells the editor to cancel editing and not accept any partially edited value.

addCellEditorListener

void addCellEditorListener(CellEditorListener l)

Adds a listener to the list that's notified when the editor stops, or cancels editing.

Parameters:

l - the CellEditorListener

removeCellEditorListener

void removeCellEditorListener(CellEditorListener l)

Removes a listener from the list that's notified

Parameters:

l - the CellEditorListener