Class ComboBoxCellEditor

java.lang.Object

javax.swing.AbstractCellEditor

jmt.framework.gui.table.editors.ComboBoxCellEditor

All Implemented Interfaces:

Serializable, CellEditor, TableCellEditor, TableCellRenderer

public class ComboBoxCellEditor
extends AbstractCellEditor
implements TableCellEditor, CellEditor, TableCellRenderer

Title: ComboBox Table CellViewer/CellEditor

Description: A component to display a ComboBox as both a viewer and an editor in a table. Internally caches already allocated editors to avoid creation of too many ComboBoxes. Renderer instance is a single element cached too.

Author:

Bertoli Marco Date: 9-gen-2006 Time: 9.44.44

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected JComboBox	comboBox
protected static HashMap<Object[], ComboBoxCellEditor>	editorCache
protected static final int	MAX_CACHESIZE
protected static ComboBoxCellEditor	renderer

Fields inherited from class AbstractCellEditor

changeEvent, listenerList

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ComboBoxCellEditor()	Creates a new ComboBox editor/renderer
protected	ComboBoxCellEditor(Object[] items)	Creates a new ComboBox editor or renderer basing on given array of items

Method Summary

Modifier and Type	Method	Description
Object	getCellEditorValue()	Returns the value contained in the editor
static ComboBoxCellEditor	getEditorInstance(Object[] items)	Returns a new instance of CellEditor that will display items in a ComboBox
static ComboBoxCellEditor	getRendererInstance()	Returns a new instance of CellRenderer that will display current item in a ComboBox
Component	getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column)	Sets an initial value for the editor.
Component	getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)	Returns the component used for drawing the cell.

Methods inherited from class AbstractCellEditor

addCellEditorListener, cancelCellEditing, fireEditingCanceled, fireEditingStopped, getCellEditorListeners, isCellEditable, removeCellEditorListener, shouldSelectCell, stopCellEditing

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface CellEditor

addCellEditorListener, cancelCellEditing, isCellEditable, removeCellEditorListener, shouldSelectCell, stopCellEditing

Field Details

MAX_CACHESIZE

protected static final int MAX_CACHESIZE

See Also:

• Constant Field Values

editorCache

protected static HashMap<Object[], ComboBoxCellEditor> editorCache

comboBox

protected JComboBox comboBox

renderer

protected static ComboBoxCellEditor renderer

Constructor Details

ComboBoxCellEditor

protected ComboBoxCellEditor(Object[] items)

Creates a new ComboBox editor or renderer basing on given array of items

Parameters:

items - array of elements to be shown on the ComboBox

ComboBoxCellEditor

protected ComboBoxCellEditor()

Creates a new ComboBox editor/renderer

Method Details

getEditorInstance

public static ComboBoxCellEditor getEditorInstance(Object[] items)

Returns a new instance of CellEditor that will display items in a ComboBox

Parameters:

items - items to be selected from the ComboBox

Returns:

CellEditor created or cached copy with the same items

getRendererInstance

public static ComboBoxCellEditor getRendererInstance()

Returns a new instance of CellRenderer that will display current item in a ComboBox

Returns:

cached CellRenderer

getCellEditorValue

public Object getCellEditorValue()

Returns the value contained in the editor

Specified by:

getCellEditorValue in interface CellEditor

Returns:

the value contained in the editor

getTableCellEditorComponent

public Component getTableCellEditorComponent(JTable table,
 Object value,
 boolean isSelected,
 int row,
 int column)

Sets an initial value for the editor. This will cause the editor to stopEditing and lose any partially edited value if the editor is editing when this method is called.

Returns the component that should be added to the client's Component hierarchy. Once installed in the client's hierarchy this component will then be able to draw and receive user input.

Specified by:

getTableCellEditorComponent in interface TableCellEditor

Parameters:

table - the JTable that is asking the editor to edit; can be null

value - the value of the cell to be edited; it is up to the specific editor to interpret and draw the value. For example, if value is the string "true", it could be rendered as a string or it could be rendered as a check box that is checked. null is a valid value

isSelected - true if the cell is to be rendered with highlighting

row - the row of the cell being edited

column - the column of the cell being edited

Returns:

the component for editing

getTableCellRendererComponent

public Component getTableCellRendererComponent(JTable table,
 Object value,
 boolean isSelected,
 boolean hasFocus,
 int row,
 int column)

Returns the component used for drawing the cell. This method is used to configure the renderer appropriately before drawing.

Specified by:

getTableCellRendererComponent in interface TableCellRenderer

Parameters:

table - the JTable that is asking the renderer to draw; can be null

value - the value of the cell to be rendered. It is up to the specific renderer to interpret and draw the value. For example, if value is the string "true", it could be rendered as a string or it could be rendered as a check box that is checked. null is a valid value

isSelected - true if the cell is to be rendered with the selection highlighted; false otherwise

hasFocus - if true, render cell appropriately. For example, put a special border on the cell, if the cell can be edited, render in the color used to indicate editing

row - the row index of the cell being drawn. When drawing the header, the value of row is -1

column - the column index of the cell being drawn