Class DefaultTreeCellRenderer

public class DefaultTreeCellRenderer
extends JLabel
implements TreeCellRenderer

Displays an entry in a tree. DefaultTreeCellRenderer is not opaque and unless you subclass paint you should not change this. See How to Use Trees in The Java Tutorial for examples of customizing node display using this class.

The set of icons and colors used by DefaultTreeCellRenderer can be configured using the various setter methods. The value for each property is initialized from the defaults table. When the look and feel changes (updateUI is invoked), any properties that have a value of type UIResource are refreshed from the defaults table. The following table lists the mapping between DefaultTreeCellRenderer property and defaults table key:

Property:	Key:
"leafIcon"	"Tree.leafIcon"
"closedIcon"	"Tree.closedIcon"
"openIcon"	"Tree.openIcon"
"textSelectionColor"	"Tree.selectionForeground"
"textNonSelectionColor"	"Tree.textForeground"
"backgroundSelectionColor"	"Tree.selectionBackground"
"backgroundNonSelectionColor"	"Tree.textBackground"
"borderSelectionColor"	"Tree.selectionBorderColor"

Implementation Note: This class overrides invalidate, validate, revalidate, repaint, and firePropertyChange solely to improve performance. If not overridden, these frequently called methods would execute code paths that are unnecessary for the default tree cell renderer. If you write your own renderer, take care to weigh the benefits and drawbacks of overriding these methods.

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.

Fields

selected

protected boolean selected

Is the value currently selected.

hasFocus

protected boolean hasFocus

True if has focus.

closedIcon

protected transient Icon closedIcon

Icon used to show non-leaf nodes that aren't expanded.

leafIcon

protected transient Icon leafIcon

Icon used to show leaf nodes.

openIcon

protected transient Icon openIcon

Icon used to show non-leaf nodes that are expanded.

textSelectionColor

protected Color textSelectionColor

Color to use for the foreground for selected nodes.

textNonSelectionColor

protected Color textNonSelectionColor

Color to use for the foreground for non-selected nodes.

backgroundSelectionColor

protected Color backgroundSelectionColor

Color to use for the background when a node is selected.

backgroundNonSelectionColor

protected Color backgroundNonSelectionColor

Color to use for the background when the node isn't selected.

borderSelectionColor

protected Color borderSelectionColor

Color to use for the focus indicator when the node has focus.

Constructors

DefaultTreeCellRenderer

public DefaultTreeCellRenderer()

Creates a DefaultTreeCellRenderer. Icons and text color are determined from the UIManager.

Methods

updateUI

public void updateUI()

Resets the UI property to a value from the current look and feel.

Overrides:

updateUI in class JLabel

Since:

1.7

See Also:

JComponent.updateUI()

getDefaultOpenIcon

public Icon getDefaultOpenIcon()

Returns the default icon, for the current laf, that is used to represent non-leaf nodes that are expanded.

getDefaultClosedIcon

public Icon getDefaultClosedIcon()

Returns the default icon, for the current laf, that is used to represent non-leaf nodes that are not expanded.

getDefaultLeafIcon

public Icon getDefaultLeafIcon()

Returns the default icon, for the current laf, that is used to represent leaf nodes.

setOpenIcon

public void setOpenIcon(Icon newIcon)

Sets the icon used to represent non-leaf nodes that are expanded.

getOpenIcon

public Icon getOpenIcon()

Returns the icon used to represent non-leaf nodes that are expanded.

setClosedIcon

public void setClosedIcon(Icon newIcon)

Sets the icon used to represent non-leaf nodes that are not expanded.

getClosedIcon

public Icon getClosedIcon()

Returns the icon used to represent non-leaf nodes that are not expanded.

setLeafIcon

public void setLeafIcon(Icon newIcon)

Sets the icon used to represent leaf nodes.

getLeafIcon

public Icon getLeafIcon()

Returns the icon used to represent leaf nodes.

setTextSelectionColor

public void setTextSelectionColor(Color newColor)

Sets the color the text is drawn with when the node is selected.

getTextSelectionColor

public Color getTextSelectionColor()

Returns the color the text is drawn with when the node is selected.

setTextNonSelectionColor

public void setTextNonSelectionColor(Color newColor)

Sets the color the text is drawn with when the node isn't selected.

getTextNonSelectionColor

public Color getTextNonSelectionColor()

Returns the color the text is drawn with when the node isn't selected.

setBackgroundSelectionColor

public void setBackgroundSelectionColor(Color newColor)

Sets the color to use for the background if node is selected.

getBackgroundSelectionColor

public Color getBackgroundSelectionColor()

Returns the color to use for the background if node is selected.

setBackgroundNonSelectionColor

public void setBackgroundNonSelectionColor(Color newColor)

Sets the background color to be used for non selected nodes.

getBackgroundNonSelectionColor

public Color getBackgroundNonSelectionColor()

Returns the background color to be used for non selected nodes.

setBorderSelectionColor

public void setBorderSelectionColor(Color newColor)

Sets the color to use for the border.

getBorderSelectionColor

public Color getBorderSelectionColor()

Returns the color the border is drawn.

setFont

public void setFont(Font font)

Subclassed to map FontUIResources to null. If font is null, or a FontUIResource, this has the effect of letting the font of the JTree show through. On the other hand, if font is non-null, and not a FontUIResource, the font becomes font.

Overrides:

setFont in class JComponent

Parameters:

font - the desired Font for this component

See Also:

Component.getFont()

getFont

public Font getFont()

Gets the font of this component.

Specified by:

getFont in interface MenuContainer

Overrides:

getFont in class Component

Returns:

this component's font; if a font has not been set for this component, the font of its parent is returned

See Also:

Component.setFont(java.awt.Font)

setBackground

public void setBackground(Color color)

Subclassed to map ColorUIResources to null. If color is null, or a ColorUIResource, this has the effect of letting the background color of the JTree show through. On the other hand, if color is non-null, and not a ColorUIResource, the background becomes color.

Overrides:

setBackground in class JComponent

Parameters:

color - the desired background Color

See Also:

Component.getBackground(), JComponent.setOpaque(boolean)

getTreeCellRendererComponent

public Component getTreeCellRendererComponent(JTree tree,
                                              Object value,
                                              boolean sel,
                                              boolean expanded,
                                              boolean leaf,
                                              int row,
                                              boolean hasFocus)

Configures the renderer based on the passed in components. The value is set from messaging the tree with convertValueToText, which ultimately invokes toString on value. The foreground color is set based on the selection and the icon is set based on the leaf and expanded parameters.

Specified by:

getTreeCellRendererComponent in interface TreeCellRenderer

Returns:

the Component that the renderer uses to draw the value

paint

public void paint(Graphics g)

Paints the value. The background is filled based on selected.

Overrides:

paint in class JComponent

Parameters:

g - the Graphics context in which to paint

See Also:

JComponent.paintComponent(java.awt.Graphics), JComponent.paintBorder(java.awt.Graphics), JComponent.paintChildren(java.awt.Graphics), JComponent.getComponentGraphics(java.awt.Graphics), JComponent.repaint(long, int, int, int, int)

getPreferredSize

public Dimension getPreferredSize()

Overrides JComponent.getPreferredSize to return slightly wider preferred size value.

Overrides:

getPreferredSize in class JComponent

Returns:

the value of the preferredSize property

See Also:

JComponent.setPreferredSize(java.awt.Dimension), ComponentUI

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), Container.invalidate(), Container.isValidateRoot(), JComponent.revalidate(), Container.validateTree()

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(), LayoutManager2

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:

JComponent.isPaintingOrigin(), 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:

JComponent.isPaintingOrigin(), 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,
                               byte oldValue,
                               byte newValue)

Overridden for performance reasons. See the Implementation Note for more information.

Overrides:

firePropertyChange in class Component

Parameters:

propertyName - the programmatic name of the property that was changed

oldValue - the old value of the property (as a byte)

newValue - the new value of the property (as a byte)

See Also:

Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)

firePropertyChange

public void firePropertyChange(String propertyName,
                               char oldValue,
                               char newValue)

Overridden for performance reasons. See the Implementation Note for more information.

Overrides:

firePropertyChange in class JComponent

Parameters:

propertyName - the programmatic name of the property that was changed

oldValue - the old value of the property (as a char)

newValue - the new value of the property (as a char)

See Also:

Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)

firePropertyChange

public void firePropertyChange(String propertyName,
                               short oldValue,
                               short newValue)

Overridden for performance reasons. See the Implementation Note for more information.

Overrides:

firePropertyChange in class Component

Parameters:

propertyName - the programmatic name of the property that was changed

oldValue - the old value of the property (as a short)

newValue - the old value of the property (as a short)

See Also:

Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)

firePropertyChange

public void firePropertyChange(String propertyName,
                               int oldValue,
                               int 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

firePropertyChange

public void firePropertyChange(String propertyName,
                               long oldValue,
                               long newValue)

Overridden for performance reasons. See the Implementation Note for more information.

Overrides:

firePropertyChange in class Component

Parameters:

propertyName - the programmatic name of the property that was changed

oldValue - the old value of the property (as a long)

newValue - the new value of the property (as a long)

See Also:

Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)

firePropertyChange

public void firePropertyChange(String propertyName,
                               float oldValue,
                               float newValue)

Overridden for performance reasons. See the Implementation Note for more information.

Overrides:

firePropertyChange in class Component

Parameters:

propertyName - the programmatic name of the property that was changed

oldValue - the old value of the property (as a float)

newValue - the new value of the property (as a float)

See Also:

Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)

firePropertyChange

public void firePropertyChange(String propertyName,
                               double oldValue,
                               double newValue)

Overridden for performance reasons. See the Implementation Note for more information.

Overrides:

firePropertyChange in class Component

Parameters:

propertyName - the programmatic name of the property that was changed

oldValue - the old value of the property (as a double)

newValue - the new value of the property (as a double)

See Also:

Component.firePropertyChange(java.lang.String, java.lang.Object, java.lang.Object)

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