Java™ Platform
Standard Ed. 6

javax.swing.table
Class DefaultTableCellRenderer

java.lang.Object
  extended by java.awt.Component
      extended by java.awt.Container
          extended by javax.swing.JComponent
              extended by javax.swing.JLabel
                  extended by 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 JavaBeansTM has been added to the java.beans package. Please see XMLEncoder.

See Also:
JTable

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.BaselineResizeBehavior, 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, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update
 
Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusBackward, transferFocusDownCycle, validateTree
 
Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, hide, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

noFocusBorder

protected static Border noFocusBorder
Constructor Detail

DefaultTableCellRenderer

public DefaultTableCellRenderer()
Creates a default table cell renderer.

Method Detail

setForeground

public void setForeground(Color c)
Overrides JComponent.setForeground to assign the unselected-foreground color to the specified color.

Overrides:
setForeground in class JComponent
Parameters:
c - set the foreground color to this value
See Also:
Component.getForeground()

setBackground

public void setBackground(Color c)
Overrides JComponent.setBackground to assign the unselected-background color to the specified color.

Overrides:
setBackground in class JComponent
Parameters:
c - set the background color to this value
See Also:
Component.getBackground(), JComponent.setOpaque(boolean)

updateUI

public void 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.

Overrides:
updateUI in class JLabel
See Also:
JComponent.updateUI()

getTableCellRendererComponent

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

Specified by:
getTableCellRendererComponent in interface TableCellRenderer
Parameters:
table - the JTable
value - the value to assign to the cell at [row, column]
isSelected - true if cell is selected
hasFocus - true if cell has focus
row - the row of the cell to render
column - the column of the cell to render
Returns:
the default table cell renderer
See Also:
JComponent.isPaintingForPrint()

isOpaque

public boolean isOpaque()
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
isOpaque in class JComponent
Returns:
true if this component is completely opaque
See Also:
JComponent.setOpaque(boolean)

invalidate

public void invalidate()
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
invalidate in class Container
Since:
1.5
See Also:
Container.validate(), Container.layout(), LayoutManager, LayoutManager2.invalidateLayout(Container)

validate

public void validate()
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
validate in class Container
See Also:
Container.add(java.awt.Component), Component.invalidate(), JComponent.revalidate(), Container.validateTree()

revalidate

public void revalidate()
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
revalidate in class JComponent
See Also:
Component.invalidate(), Container.validate(), JComponent.isValidateRoot(), RepaintManager.addInvalidComponent(javax.swing.JComponent)

repaint

public void repaint(long tm,
                    int x,
                    int y,
                    int width,
                    int height)
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
repaint in class JComponent
Parameters:
tm - this parameter is not used
x - the x value of the dirty region
y - the y value of the dirty region
width - the width of the dirty region
height - the height of the dirty region
See Also:
Component.isShowing(), RepaintManager.addDirtyRegion(javax.swing.JComponent, int, int, int, int)

repaint

public void repaint(Rectangle r)
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
repaint in class JComponent
Parameters:
r - a Rectangle containing the dirty region
See Also:
Component.isShowing(), RepaintManager.addDirtyRegion(javax.swing.JComponent, int, int, int, int)

repaint

public void repaint()
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
repaint in class Component
Since:
1.5
See Also:
Component.update(Graphics)

firePropertyChange

protected void firePropertyChange(String propertyName,
                                  Object oldValue,
                                  Object newValue)
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
firePropertyChange in class Component
Parameters:
propertyName - the property whose value has changed
oldValue - the property's previous value
newValue - the property's new value

firePropertyChange

public void firePropertyChange(String propertyName,
                               boolean oldValue,
                               boolean newValue)
Overridden for performance reasons. See the Implementation Note for more information.

Overrides:
firePropertyChange in class JComponent
Parameters:
propertyName - the property whose value has changed
oldValue - the property's previous value
newValue - the property's new value

setValue

protected void setValue(Object value)
Sets the String object for the cell being rendered to value.

Parameters:
value - the string value for this cell; if value is null it sets the text value to an empty string
See Also:
JLabel.setText(java.lang.String)

Java™ Platform
Standard Ed. 6

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