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™ has been added to the java.beans package. Please see XMLEncoder.
JTable| Modifier and Type | Class and Description |
|---|---|
static class |
DefaultTableCellRenderer.UIResource A subclass of |
JLabel.AccessibleJLabel JComponent.AccessibleJComponent Container.AccessibleAWTContainer Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy protected static Border noFocusBorder
public DefaultTableCellRenderer()
Creates a default table cell renderer.
public void setForeground(Color c)
Overrides JComponent.setForeground to assign the unselected-foreground color to the specified color.
setForeground in class JComponent
c - set the foreground color to this valueComponent.getForeground()public void setBackground(Color c)
Overrides JComponent.setBackground to assign the unselected-background color to the specified color.
setBackground in class JComponent
c - set the background color to this valueComponent.getBackground(), JComponent.setOpaque(boolean)
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.
updateUI in class JLabel
JComponent.updateUI()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().
getTableCellRendererComponent in interface TableCellRenderer
table - the JTable
value - the value to assign to the cell at [row, column]
isSelected - true if cell is selectedhasFocus - true if cell has focusrow - the row of the cell to rendercolumn - the column of the cell to renderJComponent.isPaintingForPrint()public boolean isOpaque()
Overridden for performance reasons. See the Implementation Note for more information.
isOpaque in class JComponent
JComponent.setOpaque(boolean)public void invalidate()
Overridden for performance reasons. See the Implementation Note for more information.
invalidate in class Container
Container.validate(), Container.layout(), LayoutManager2
public void validate()
Overridden for performance reasons. See the Implementation Note for more information.
validate in class Container
Container.add(java.awt.Component), Container.invalidate(), Container.isValidateRoot(), JComponent.revalidate(), Container.validateTree()
public void revalidate()
Overridden for performance reasons. See the Implementation Note for more information.
revalidate in class JComponent
Component.invalidate(), Container.validate(), JComponent.isValidateRoot(), RepaintManager.addInvalidComponent(javax.swing.JComponent)
public void repaint(long tm,
int x,
int y,
int width,
int height) Overridden for performance reasons. See the Implementation Note for more information.
repaint in class JComponent
tm - this parameter is not usedx - the x value of the dirty regiony - the y value of the dirty regionwidth - the width of the dirty regionheight - the height of the dirty regionJComponent.isPaintingOrigin(), Component.isShowing(), RepaintManager.addDirtyRegion(javax.swing.JComponent, int, int, int, int)
public void repaint(Rectangle r)
Overridden for performance reasons. See the Implementation Note for more information.
repaint in class JComponent
r - a Rectangle containing the dirty regionJComponent.isPaintingOrigin(), Component.isShowing(), RepaintManager.addDirtyRegion(javax.swing.JComponent, int, int, int, int)
public void repaint()
Overridden for performance reasons. See the Implementation Note for more information.
repaint in class Component
Component.update(Graphics)protected void firePropertyChange(String propertyName,
Object oldValue,
Object newValue) Overridden for performance reasons. See the Implementation Note for more information.
firePropertyChange in class Component
propertyName - the property whose value has changedoldValue - the property's previous valuenewValue - the property's new valuepublic void firePropertyChange(String propertyName,
boolean oldValue,
boolean newValue) Overridden for performance reasons. See the Implementation Note for more information.
firePropertyChange in class JComponent
propertyName - the property whose value has changedoldValue - the property's previous valuenewValue - the property's new valueprotected void setValue(Object value)
Sets the String object for the cell being rendered to value.
value - the string value for this cell; if value is null it sets the text value to an empty stringJLabel.setText(java.lang.String)
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