Class BasicLabelUI

java.lang.Object
- javax.swing.plaf.ComponentUI
- - javax.swing.plaf.LabelUI
  - - javax.swing.plaf.basic.BasicLabelUI

All Implemented Interfaces:: PropertyChangeListener, EventListener

Direct Known Subclasses:: MetalLabelUI, SynthLabelUI

public class BasicLabelUI
extends LabelUI
implements PropertyChangeListener

A Windows L&F implementation of LabelUI. This implementation is completely static, i.e. there's only one UIView implementation that's shared by all JLabel objects.

Field Summary

Fields
Modifier and Type	Field	Description
`protected static BasicLabelUI`	`labelUI`	The default `BasicLabelUI` instance.

Constructor Summary

Constructors
Constructor	Description
`BasicLabelUI()`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static ComponentUI`	`createUI(JComponent c)`	Returns an instance of `BasicLabelUI`.
`int`	`getBaseline(JComponent c, int width, int height)`	Returns the baseline.
`Component.BaselineResizeBehavior`	`getBaselineResizeBehavior(JComponent c)`	Returns an enum indicating how the baseline of the component changes as the size changes.
`Dimension`	`getMaximumSize(JComponent c)`	Returns the specified component's maximum size appropriate for the look and feel.
`Dimension`	`getMinimumSize(JComponent c)`	Returns the specified component's minimum size appropriate for the look and feel.
`protected void`	`installComponents(JLabel c)`	Registers components.
`protected void`	`installDefaults(JLabel c)`	Installs default properties.
`protected void`	`installKeyboardActions(JLabel l)`	Registers keyboard actions.
`protected void`	`installListeners(JLabel c)`	Registers listeners.
`protected String`	`layoutCL(JLabel label, FontMetrics fontMetrics, String text, Icon icon, Rectangle viewR, Rectangle iconR, Rectangle textR)`	Forwards the call to SwingUtilities.layoutCompoundLabel().
`void`	`paint(Graphics g, JComponent c)`	Paints the label text with the foreground color, if the label is opaque then paints the entire background with the background color.
`protected void`	`paintDisabledText(JLabel l, Graphics g, String s, int textX, int textY)`	Paint clippedText at textX, textY with background.lighter() and then shifted down and to the right by one pixel with background.darker().
`protected void`	`paintEnabledText(JLabel l, Graphics g, String s, int textX, int textY)`	Paint clippedText at textX, textY with the labels foreground color.
`protected void`	`uninstallComponents(JLabel c)`	Unregisters components.
`protected void`	`uninstallDefaults(JLabel c)`	Uninstalls default properties.
`protected void`	`uninstallKeyboardActions(JLabel c)`	Unregisters keyboard actions.
`protected void`	`uninstallListeners(JLabel c)`	Unregisters listeners.

Methods declared in class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, getPreferredSize, installUI, uninstallUI, update

Methods declared in class java.lang.Object

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

Methods declared in interface java.beans.PropertyChangeListener

propertyChange

Field Detail

labelUI

protected static BasicLabelUI labelUI

The default BasicLabelUI instance. This field might not be used. To change the default instance use a subclass which overrides the createUI method, and place that class name in defaults table under the key "LabelUI".

Constructor Detail

BasicLabelUI

public BasicLabelUI()

Method Detail

layoutCL

protected String layoutCL(JLabel label,
                          FontMetrics fontMetrics,
                          String text,
                          Icon icon,
                          Rectangle viewR,
                          Rectangle iconR,
                          Rectangle textR)

Forwards the call to SwingUtilities.layoutCompoundLabel(). This method is here so that a subclass could do Label specific layout and to shorten the method name a little.

Parameters:: label - an instance of JLabel; fontMetrics - a font metrics; text - a text; icon - an icon; viewR - a bounding rectangle to lay out label; iconR - a bounding rectangle to lay out icon; textR - a bounding rectangle to lay out text
Returns:: a possibly clipped version of the compound labels string
See Also:: SwingUtilities.layoutCompoundLabel(javax.swing.JComponent, java.awt.FontMetrics, java.lang.String, javax.swing.Icon, int, int, int, int, java.awt.Rectangle, java.awt.Rectangle, java.awt.Rectangle, int)

paintEnabledText

protected void paintEnabledText(JLabel l,
                                Graphics g,
                                String s,
                                int textX,
                                int textY)

Paint clippedText at textX, textY with the labels foreground color.

Parameters:: l - an instance of JLabel; g - an instance of Graphics; s - a text; textX - an X coordinate; textY - an Y coordinate
See Also:: paint(java.awt.Graphics, javax.swing.JComponent), paintDisabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int)

paintDisabledText

protected void paintDisabledText(JLabel l,
                                 Graphics g,
                                 String s,
                                 int textX,
                                 int textY)

Paint clippedText at textX, textY with background.lighter() and then shifted down and to the right by one pixel with background.darker().

Parameters:: l - an instance of JLabel; g - an instance of Graphics; s - a text; textX - an X coordinate; textY - an Y coordinate
See Also:: paint(java.awt.Graphics, javax.swing.JComponent), paintEnabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int)

paint

public void paint(Graphics g,
                  JComponent c)

Paints the label text with the foreground color, if the label is opaque then paints the entire background with the background color. The Label text is drawn by paintEnabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int) or paintDisabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int). The locations of the label parts are computed by layoutCL(javax.swing.JLabel, java.awt.FontMetrics, java.lang.String, javax.swing.Icon, java.awt.Rectangle, java.awt.Rectangle, java.awt.Rectangle).

Overrides:: paint in class ComponentUI
Parameters:: g - the Graphics context in which to paint; c - the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
See Also:: paintEnabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int), paintDisabledText(javax.swing.JLabel, java.awt.Graphics, java.lang.String, int, int), layoutCL(javax.swing.JLabel, java.awt.FontMetrics, java.lang.String, javax.swing.Icon, java.awt.Rectangle, java.awt.Rectangle, java.awt.Rectangle)

getMinimumSize

public Dimension getMinimumSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's minimum size appropriate for the look and feel. If null is returned, the minimum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.

Overrides:: getMinimumSize in class ComponentUI
Parameters:: c - the component whose minimum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
Returns:: getPreferredSize(c)
See Also:: JComponent.getMinimumSize(), LayoutManager.minimumLayoutSize(java.awt.Container), ComponentUI.getPreferredSize(javax.swing.JComponent)

getMaximumSize

public Dimension getMaximumSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's maximum size appropriate for the look and feel. If null is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.

Overrides:: getMaximumSize in class ComponentUI
Parameters:: c - the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
Returns:: getPreferredSize(c)
See Also:: JComponent.getMaximumSize(), LayoutManager2.maximumLayoutSize(java.awt.Container)

getBaseline

public int getBaseline(JComponent c,
                       int width,
                       int height)

Returns the baseline.

Overrides:: getBaseline in class ComponentUI
Parameters:: c - JComponent baseline is being requested for; width - the width to get the baseline for; height - the height to get the baseline for
Returns:: baseline or a value < 0 indicating there is no reasonable baseline
Throws:: NullPointerException - if c is null; IllegalArgumentException - if width or height is < 0
Since:: 1.6
See Also:: JComponent.getBaseline(int, int)

getBaselineResizeBehavior

public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)

Returns an enum indicating how the baseline of the component changes as the size changes.

Overrides:: getBaselineResizeBehavior in class ComponentUI
Parameters:: c - JComponent to return baseline resize behavior for
Returns:: an enum indicating how the baseline changes as the component size changes
Throws:: NullPointerException - if c is null
Since:: 1.6
See Also:: JComponent.getBaseline(int, int)

installDefaults

protected void installDefaults(JLabel c)

Installs default properties.

Parameters:: c - an instance of JLabel

installListeners

protected void installListeners(JLabel c)

Registers listeners.

Parameters:: c - an instance of JLabel

installComponents

protected void installComponents(JLabel c)

Registers components.

Parameters:: c - an instance of JLabel

installKeyboardActions

protected void installKeyboardActions(JLabel l)

Registers keyboard actions.

Parameters:: l - an instance of JLabel

uninstallDefaults

protected void uninstallDefaults(JLabel c)

Uninstalls default properties.

Parameters:: c - an instance of JLabel

uninstallListeners

protected void uninstallListeners(JLabel c)

Unregisters listeners.

Parameters:: c - an instance of JLabel

uninstallComponents

protected void uninstallComponents(JLabel c)

Unregisters components.

Parameters:: c - an instance of JLabel

uninstallKeyboardActions

protected void uninstallKeyboardActions(JLabel c)

Unregisters keyboard actions.

Parameters:: c - an instance of JLabel

createUI

public static ComponentUI createUI(JComponent c)

Returns an instance of BasicLabelUI.

Parameters:: c - a component
Returns:: an instance of BasicLabelUI