The standard class for rendering (displaying) individual cells in a JTable.

Implementation Note: This class inherits from JLabel, a standard component class. However JTable employs a unique mechanism for rendering its cells and therefore requires some slightly modified behavior from its cell renderer. The table class defines a single cell renderer and uses it as a as a rubber-stamp for rendering all cells in the table; it renders the first cell, changes the contents of that cell renderer, shifts the origin to the new location, re-draws it, and so on. The standard JLabel component was not designed to be used this way and we want to avoid triggering a revalidate each time the cell is drawn. This would greatly decrease performance because the revalidate message would be passed up the hierarchy of the container to determine whether any other components would be affected. As the renderer is only parented for the lifetime of a painting operation we similarly want to avoid the overhead associated with walking the hierarchy for painting operations. So this class overrides the validate, invalidate, revalidate, repaint, and firePropertyChange methods to be no-ops and override the isOpaque method solely to improve performance. If you write your own renderer, please keep this performance consideration in mind.

Warning

Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the java.beans package. Please see java.beans.XMLEncoder.

Nested and Inner Type Summary

Modifier and Type	Class and Description
public static class	DefaultTableCellRenderer.UIResource A subclass of `DefaultTableCellRenderer` that implements `UIResource`.

Field Summary

Modifier and Type	Field and Description
private static final Border	DEFAULT_NO_FOCUS_BORDER An empty `Border`.
protected static Border	noFocusBorder A border without focus.
private Color	unselectedBackground
private Color	unselectedForeground

Inherited from javax.swing.JLabel:: labelFor

Constructor Summary

Access	Constructor and Description
public	DefaultTableCellRenderer() Creates a default table cell renderer.

Method Summary

Modifier and Type	Method and Description
protected void	firePropertyChange(String propertyName, Object oldValue, Object newValue) Overrides java.awt.Component.firePropertyChange. Overridden for performance reasons.
public void	firePropertyChange(String propertyName, boolean oldValue, boolean newValue) Overrides javax.swing.JComponent.firePropertyChange. Overridden for performance reasons.
private Border	getNoFocusBorder()
public Component	Returns: the default table cell renderer getTableCellRendererComponent(JTable the `JTable` table, Object the value to assign to the cell at `[row, column]` value, boolean true if cell is selected isSelected, boolean true if cell has focus hasFocus, int the row of the cell to render row, int the column of the cell to render column) Implements javax.swing.table.TableCellRenderer.getTableCellRendererComponent. Returns the default table cell renderer.
public void	invalidate() Overrides java.awt.Container.invalidate. Overridden for performance reasons.
public boolean	isOpaque() Overrides javax.swing.JComponent.isOpaque. Overridden for performance reasons.
public void	repaint(long tm, int x, int y, int width, int height) Overrides javax.swing.JComponent.repaint. Overridden for performance reasons.
public void	repaint(Rectangle r) Overrides javax.swing.JComponent.repaint. Overridden for performance reasons.
public void	repaint() Overrides java.awt.Component.repaint. Overridden for performance reasons.
public void	revalidate() Overrides javax.swing.JComponent.revalidate. Overridden for performance reasons.
public void	setBackground(Color set the background color to this value c) Overrides javax.swing.JComponent.setBackground. Overrides `JComponent.setBackground` to assign the unselected-background color to the specified color.
public void	setForeground(Color set the foreground color to this value c) Overrides javax.swing.JComponent.setForeground. Overrides `JComponent.setForeground` to assign the unselected-foreground color to the specified color.
protected void	setValue(Object the string value for this cell; if value is `null` it sets the text value to an empty string value) Sets the `String` object for the cell being rendered to `value`.
public void	updateUI() Overrides javax.swing.JLabel.updateUI. Notification from the `UIManager` that the look and feel [L&F] has changed.
public void	validate() Overrides java.awt.Container.validate. Overridden for performance reasons.
private void	writeObject(ObjectOutputStream s) Hides javax.swing.JLabel.writeObject. See readObject() and writeObject() in JComponent for more information about serialization in Swing.

Field Detail

DEFAULT_NO_FOCUS_BORDER	back to summary
private static final Border DEFAULT_NO_FOCUS_BORDER An empty `Border`. This field might not be used. To change the `Border` used by this renderer override the `getTableCellRendererComponent` method and set the border of the returned component directly.

noFocusBorder	back to summary
protected static Border noFocusBorder A border without focus.

unselectedBackground	back to summary
private Color unselectedBackground

unselectedForeground	back to summary
private Color unselectedForeground

Constructor Detail

DefaultTableCellRenderer	back to summary
public DefaultTableCellRenderer() Creates a default table cell renderer.

Method Detail

firePropertyChange	back to summary
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) Overrides java.awt.Component.firePropertyChange. Overridden for performance reasons. See the Implementation Note for more information.

firePropertyChange

back to summary

protected void firePropertyChange(String propertyName, Object oldValue, Object newValue)

Overrides java.awt.Component.firePropertyChange.

Overridden for performance reasons. See the Implementation Note for more information.

firePropertyChange	back to summary
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) Overrides javax.swing.JComponent.firePropertyChange. Overridden for performance reasons. See the Implementation Note for more information.

firePropertyChange

back to summary

public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)

Overrides javax.swing.JComponent.firePropertyChange.

Overridden for performance reasons. See the Implementation Note for more information.

getNoFocusBorder	back to summary
private Border getNoFocusBorder()

getTableCellRendererComponent back to summary

getTableCellRendererComponent	back to summary
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) Implements javax.swing.table.TableCellRenderer.getTableCellRendererComponent. Returns the default table cell renderer. During a printing operation, this method will be called with `isSelected` and `hasFocus` values of `false` to prevent selection and focus from appearing in the printed output. To do other customization based on whether or not the table is being printed, check the return value from `javax.swing.JComponent#isPaintingForPrint()`. Parameters table:JTable the `JTable` value:Object the value to assign to the cell at `[row, column]` isSelected:boolean true if cell is selected hasFocus:boolean true if cell has focus row:int the row of the cell to render column:int the column of the cell to render Returns:Component the default table cell renderer See Also `javax.swing.JComponent#isPaintingForPrint()`

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

Implements javax.swing.table.TableCellRenderer.getTableCellRendererComponent.

Returns the default table cell renderer.

During a printing operation, this method will be called with isSelected and hasFocus values of false to prevent selection and focus from appearing in the printed output. To do other customization based on whether or not the table is being printed, check the return value from javax.swing.JComponent#isPaintingForPrint().

Parameters

table:JTable: the JTable
value:Object: the value to assign to the cell at [row, column]
isSelected:boolean: true if cell is selected
hasFocus:boolean: true if cell has focus
row:int: the row of the cell to render
column:int: the column of the cell to render

Returns:Component

the default table cell renderer

invalidate	back to summary
public void invalidate() Overrides java.awt.Container.invalidate. Overridden for performance reasons. See the Implementation Note for more information. Since 1.5

invalidate

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public void invalidate()

Overrides java.awt.Container.invalidate.

Overridden for performance reasons. See the Implementation Note for more information.

Since: 1.5

isOpaque	back to summary
public boolean isOpaque() Overrides javax.swing.JComponent.isOpaque. Overridden for performance reasons. See the Implementation Note for more information.

isOpaque

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public boolean isOpaque()

Overrides javax.swing.JComponent.isOpaque.

Overridden for performance reasons. See the Implementation Note for more information.

repaint	back to summary
public void repaint(long tm, int x, int y, int width, int height) Overrides javax.swing.JComponent.repaint. Overridden for performance reasons. See the Implementation Note for more information.

repaint

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public void repaint(long tm, int x, int y, int width, int height)

Overrides javax.swing.JComponent.repaint.

Overridden for performance reasons. See the Implementation Note for more information.

repaint	back to summary
public void repaint(Rectangle r) Overrides javax.swing.JComponent.repaint. Overridden for performance reasons. See the Implementation Note for more information.

repaint

back to summary

public void repaint(Rectangle r)

Overrides javax.swing.JComponent.repaint.

Overridden for performance reasons. See the Implementation Note for more information.

repaint	back to summary
public void repaint() Overrides java.awt.Component.repaint. Overridden for performance reasons. See the Implementation Note for more information. Since 1.5

repaint

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public void repaint()

Overrides java.awt.Component.repaint.

Overridden for performance reasons. See the Implementation Note for more information.

Since: 1.5

revalidate	back to summary
public void revalidate() Overrides javax.swing.JComponent.revalidate. Overridden for performance reasons. See the Implementation Note for more information.

revalidate

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public void revalidate()

Overrides javax.swing.JComponent.revalidate.

Overridden for performance reasons. See the Implementation Note for more information.

setBackground back to summary

setBackground	back to summary
public void setBackground(Color c) Overrides javax.swing.JComponent.setBackground. Overrides `JComponent.setBackground` to assign the unselected-background color to the specified color. Parameters c:Color set the background color to this value

public void setBackground(Color c)

Overrides javax.swing.JComponent.setBackground.

Overrides JComponent.setBackground to assign the unselected-background color to the specified color.

Parameters

c:Color: set the background color to this value

setForeground back to summary

setForeground	back to summary
public void setForeground(Color c) Overrides javax.swing.JComponent.setForeground. Overrides `JComponent.setForeground` to assign the unselected-foreground color to the specified color. Parameters c:Color set the foreground color to this value

public void setForeground(Color c)

Overrides javax.swing.JComponent.setForeground.

Overrides JComponent.setForeground to assign the unselected-foreground color to the specified color.

Parameters

c:Color: set the foreground color to this value

setValue back to summary

setValue	back to summary
protected void setValue(Object value) Sets the `String` object for the cell being rendered to `value`. Parameters value:Object the string value for this cell; if value is `null` it sets the text value to an empty string See Also `JLabel#setText`

protected void setValue(Object value)

Sets the String object for the cell being rendered to value.

Parameters

value:Object: the string value for this cell; if value is null it sets the text value to an empty string

See Also

JLabel#setText

updateUI back to summary

updateUI	back to summary
public void updateUI() Overrides javax.swing.JLabel.updateUI. Notification from the `UIManager` that the look and feel [L&F] has changed. Replaces the current UI object with the latest version from the `UIManager`. See Also `JComponent#updateUI`

public void updateUI()

Overrides javax.swing.JLabel.updateUI.

Notification from the UIManager that the look and feel [L&F] has changed. Replaces the current UI object with the latest version from the UIManager.

See Also: JComponent#updateUI

validate	back to summary
public void validate() Overrides java.awt.Container.validate. Overridden for performance reasons. See the Implementation Note for more information.

validate

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public void validate()

Overrides java.awt.Container.validate.

Overridden for performance reasons. See the Implementation Note for more information.

writeObject	back to summary
private void writeObject(ObjectOutputStream s) throws IOException Hides javax.swing.JLabel.writeObject. See readObject() and writeObject() in JComponent for more information about serialization in Swing. Annotations @Serial Exceptions IOException: Doc from java.awt.Container.writeObject. if an I/O error occurs

writeObject

back to summary

private void writeObject(ObjectOutputStream s) throws IOException

Hides javax.swing.JLabel.writeObject.

See readObject() and writeObject() in JComponent for more information about serialization in Swing.

Annotations

@Serial

Exceptions

IOException:

Doc from java.awt.Container.writeObject.

if an I/O error occurs

javax.swing.table back to summary

public Class DefaultTableCellRenderer.UIResource

Class Inheritance

extends DefaultTableCellRenderer
implements UIResource

java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JLabel
javax.swing.table.DefaultTableCellRenderer
javax.swing.table.DefaultTableCellRenderer.UIResource

All Implemented Interfaces

javax.swing.plaf.UIResource

Known Direct Subclasses

javax.swing.JTable.NumberRenderer, javax.swing.JTable.DateRenderer, javax.swing.JTable.IconRenderer

Annotations

@SuppressWarnings:serial

A subclass of DefaultTableCellRenderer that implements UIResource. DefaultTableCellRenderer doesn't implement UIResource directly so that applications can safely override the cellRenderer property with DefaultTableCellRenderer subclasses.

Warning

Field Summary

Inherited from javax.swing.table.DefaultTableCellRenderer:: noFocusBorder

Constructor Summary

Access	Constructor and Description
public	UIResource() Constructs a `UIResource`.

Method Summary

Inherited from javax.swing.table.DefaultTableCellRenderer:: firePropertyChange firePropertyChange getTableCellRendererComponent invalidate isOpaque repaint repaint repaint revalidate setBackground setForeground setValue updateUI validate

Constructor Detail

UIResource	back to summary
public UIResource() Constructs a `UIResource`.