javax.swing.table
Class DefaultTableCellRenderer

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

All Implemented Interfaces:

ImageObserver , MenuContainer , Serializable , Accessible , SwingConstants , TableCellRenderer

Direct Known Subclasses:

DefaultTableCellRenderer.UIResource

public class DefaultTableCellRenderer
extends JLabel   
implements TableCellRenderer   , Serializable   

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^TM has been added to the java.beans package. Please see XMLEncoder .

See Also:

JTable , Serialized Form

Nested Class Summary

static class

DefaultTableCellRenderer.UIResource A subclass of DefaultTableCellRenderer that implements UIResource.

Nested classes/interfaces inherited from class javax.swing.JLabel

JLabel.AccessibleJLabel

Nested classes/interfaces inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent , Component.BltBufferStrategy , Component.FlipBufferStrategy

Field Summary

protected static Border

noFocusBorder

Fields inherited from class javax.swing.JLabel

labelFor

Fields inherited from class javax.swing.JComponent

accessibleContext , listenerList , TOOL_TIP_TEXT_KEY , ui , UNDEFINED_CONDITION , WHEN_ANCESTOR_OF_FOCUSED_COMPONENT , WHEN_FOCUSED , WHEN_IN_FOCUSED_WINDOW

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT , CENTER_ALIGNMENT , LEFT_ALIGNMENT , RIGHT_ALIGNMENT , TOP_ALIGNMENT

Fields inherited from interface javax.swing.SwingConstants

BOTTOM , CENTER , EAST , HORIZONTAL , LEADING , LEFT , NEXT , NORTH , NORTH_EAST , NORTH_WEST , PREVIOUS , RIGHT , SOUTH , SOUTH_EAST , SOUTH_WEST , TOP , TRAILING , VERTICAL , WEST

Fields inherited from interface java.awt.image.ImageObserver

ABORT , ALLBITS , ERROR , FRAMEBITS , HEIGHT , PROPERTIES , SOMEBITS , WIDTH

Constructor Summary

DefaultTableCellRenderer ()
Creates a default table cell renderer.

Method Summary

void	firePropertyChange (String propertyName, boolean oldValue, boolean newValue) Overridden for performance reasons.
protected void	firePropertyChange (String propertyName, Object oldValue, Object newValue) Overridden for performance reasons.
Component	getTableCellRendererComponent (JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) Returns the default table cell renderer.
void	invalidate () Overridden for performance reasons.
boolean	isOpaque () Overridden for performance reasons.
void	repaint () Overridden for performance reasons.
void	repaint (long tm, int x, int y, int width, int height) Overridden for performance reasons.
void	repaint (Rectangle r) Overridden for performance reasons.
void	revalidate () Overridden for performance reasons.
void	setBackground (Color c) Overrides JComponent.setBackground to assign the unselected-background color to the specified color.
void	setForeground (Color c) Overrides JComponent.setForeground to assign the unselected-foreground color to the specified color.
protected void	setValue (Object value) Sets the String object for the cell being rendered to value.
void	updateUI () Notification from the UIManager that the look and feel [L&F] has changed.
void	validate () Overridden for performance reasons.

Methods inherited from class javax.swing.JLabel

checkHorizontalKey , checkVerticalKey , getAccessibleContext , getDisabledIcon , getDisplayedMnemonic , getDisplayedMnemonicIndex , getHorizontalAlignment , getHorizontalTextPosition , getIcon , getIconTextGap , getLabelFor , getText , getUI , getUIClassID , getVerticalAlignment , getVerticalTextPosition , imageUpdate , paramString , setDisabledIcon , setDisplayedMnemonic , setDisplayedMnemonic , setDisplayedMnemonicIndex , setHorizontalAlignment , setHorizontalTextPosition , setIcon , setIconTextGap , setLabelFor , setText , setUI , setVerticalAlignment , setVerticalTextPosition

Methods inherited from class javax.swing.JComponent

addAncestorListener , addNotify , addVetoableChangeListener , computeVisibleRect , contains , createToolTip , disable , enable , firePropertyChange , firePropertyChange , fireVetoableChange , getActionForKeyStroke , getActionMap , getAlignmentX , getAlignmentY , getAncestorListeners , getAutoscrolls , getBorder , getBounds , getClientProperty , getComponentGraphics , getComponentPopupMenu , getConditionForKeyStroke , getDebugGraphicsOptions , getDefaultLocale , getFontMetrics , getGraphics , getHeight , getInheritsPopupMenu , getInputMap