javax.swing
Class CellRendererPane

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.CellRendererPane

public class CellRendererPane

extends Container

implements Accessible

This class is inserted in between cell renderers and the components that use them. It just exists to thwart the repaint() and invalidate() methods which would otherwise propogate up the tree when the renderer was configured. It's used by the implementations of JTable, JTree, and JList. For example, here's how CellRendererPane is used in the code the paints each row in a JList:

   cellRendererPane = new CellRendererPane();
   ...
   Component rendererComponent = renderer.getListCellRendererComponent();
   renderer.configureListCellRenderer(dataModel.getElementAt(row), row);
   cellRendererPane.paintComponent(g, rendererComponent, this, x, y, w, h);
 

A renderer component must override isShowing() and unconditionally return true to work correctly because the Swing paint does nothing for components with isShowing false.

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. A future release of Swing will provide support for long term persistence.

See Also:

Serialized Form

Inner Class Summary

protected class

CellRendererPane.AccessibleCellRendererPane

Field Summary

protected AccessibleContext

accessibleContext

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

CellRendererPane()
Construct a CellRendererPane object.

Method Summary

protected void	addImpl(Component x, Object constraints, int index) If the specified component is already a child of this then we don't bother doing anything - stacking order doesn't matter for cell renderer components (CellRendererPane doesn't paint anyway).<
AccessibleContext	getAccessibleContext() Get the AccessibleContext associated with this CellRendererPane
void	invalidate() Overridden to avoid propogating a invalidate up the tree when the cell renderer child is configured.
void	paint(Graphics g) Shouldn't be called.
void	paintComponent(Graphics g, Component c, Container p, int x, int y, int w, int h) Calls this.paintComponent(g, c, p, x, y, w, h, false).
void	paintComponent(Graphics g, Component c, Container p, int x, int y, int w, int h, boolean shouldValidate) Paint a cell renderer component c on graphics object g.
void	paintComponent(Graphics g, Component c, Container p, Rectangle r) Calls this.paintComponent() with the rectangles x,y,width,height fields.
void	update(Graphics g) Shouldn't be called.

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addNotify, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, isAncestorOf, layout, list, list, locate, minimumSize, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setFont, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

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

Field Detail

accessibleContext

protected AccessibleContext accessibleContext

Constructor Detail

CellRendererPane

public CellRendererPane()

Construct a CellRendererPane object.

Method Detail

invalidate

public void invalidate()

Overridden to avoid propogating a invalidate up the tree when the cell renderer child is configured.

Overrides:

invalidate in class Container

paint

public void paint(Graphics g)

Shouldn't be called.

Overrides:

paint in class Container

update

public void update(Graphics g)

Shouldn't be called.

Overrides:

update in class Container

addImpl

protected void addImpl(Component x,
                       Object constraints,
                       int index)

If the specified component is already a child of this then we don't bother doing anything - stacking order doesn't matter for cell renderer components (CellRendererPane doesn't paint anyway).<

Overrides:

addImpl in class Container

paintComponent

public void paintComponent(Graphics g,
                           Component c,
                           Container p,
                           int x,
                           int y,
                           int w,
                           int h,
                           boolean shouldValidate)

Paint a cell renderer component c on graphics object g. Before the component is drawn it's reparented to this (if that's neccessary), it's bounds are set to w,h and the graphics object is (effectively) translated to x,y. If it's a JComponent, double buffering is temporarily turned off. After the component is painted it's bounds are reset to -w, -h, 0, 0 so that, if it's the last renderer component painted, it will not start consuming input. The Container p is the component we're actually drawing on, typically it's equal to this.getParent(). If shouldValidate is true the component c will be validated before painted.

paintComponent

public void paintComponent(Graphics g,
                           Component c,
                           Container p,
                           int x,
                           int y,
                           int w,
                           int h)

Calls this.paintComponent(g, c, p, x, y, w, h, false).

paintComponent

public void paintComponent(Graphics g,
                           Component c,
                           Container p,
                           Rectangle r)

Calls this.paintComponent() with the rectangles x,y,width,height fields.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Get the AccessibleContext associated with this CellRendererPane

Specified by:

getAccessibleContext in interface Accessible

Returns:

the AccessibleContext of this CellRendererPane