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Java 2 Platform SE v1.3.1: Class CellRendererPane
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JavaTM 2 Platform
Std. Ed. v1.3.1
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javax.swing
Class CellRendererPane

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.CellRendererPane
All Implemented Interfaces:
Accessible, ImageObserver, MenuContainer, Serializable
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
          This class implements accessibility support for the CellRendererPane class.
 
Inner classes inherited from class java.awt.Container
Container.AccessibleAWTContainer
 
Inner classes inherited from class java.awt.Component
Component.AccessibleAWTComponent
 
Field Summary
protected  AccessibleContext accessibleContext
           
 
Fields inherited from class java.awt.Component
BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
 
Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
 
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()
          Gets 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, getListeners, 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, addHierarchyBoundsListener, addHierarchyListener, 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, getGraphicsConfiguration, 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, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, 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
Following copied from class: java.awt.Container
See Also:
Container.validate(), Container.layout(), LayoutManager

paint

public void paint(Graphics g)
Shouldn't be called.
Overrides:
paint in class Container
Following copied from class: java.awt.Container
Parameters:
g - the specified Graphics window
See Also:
Component.update(java.awt.Graphics)

update

public void update(Graphics g)
Shouldn't be called.
Overrides:
update in class Container
Following copied from class: java.awt.Container
Parameters:
g - the specified Graphics window
See Also:
Component.update(java.awt.Graphics)

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
Following copied from class: java.awt.Container
Parameters:
comp - the component to be added.
constraints - an object expressing layout contraints for this component.
index - the position in the container's list at which to insert the component, where -1 means insert at the end.
See Also:
Container.add(java.awt.Component), Container.add(java.awt.Component, int), Container.add(java.awt.Component, java.lang.Object), LayoutManager

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()
Gets the AccessibleContext associated with this CellRendererPane. For CellRendererPanes, the AccessibleContext takes the form of an AccessibleCellRendererPane. A new AccessibleCellRendererPane instance is created if necessary.
Specified by:
getAccessibleContext in interface Accessible
Overrides:
getAccessibleContext in class Component
Returns:
an AccessibleCellRendererPane that serves as the AccessibleContext of this CellRendererPane
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JavaTM 2 Platform
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Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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