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 and Description

protected static BasicLabelUI labelUI
The default BasicLabelUI instance.

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Constructor Summary

Constructors
Constructor and Description

BasicLabelUI()

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Method Summary

Methods
Modifier and Type	Method and 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.
`Dimension`	`getPreferredSize(JComponent c)` Returns the specified component's preferred 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.
`void`	`installUI(JComponent c)` Configures the specified component appropriately for the look and feel.
`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.
`void`	`propertyChange(PropertyChangeEvent e)` This method gets called when a bound property is changed.
`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.
`void`	`uninstallUI(JComponent c)` Reverses configuration which was done on the specified component during `installUI`.

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Methods inherited from class javax.swing.plaf.ComponentUI
contains, getAccessibleChild, getAccessibleChildrenCount, update

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 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)
  - getPreferredSize
```
public Dimension getPreferredSize(JComponent c)
```
    Description copied from class: ComponentUI
    
    Returns the specified component's preferred size appropriate for the look and feel. If null is returned, the preferred 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 returns null.
    
    Overrides:
    
    getPreferredSize in class ComponentUI
    
    Parameters:
    c - the component whose preferred size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    See Also:
    JComponent.getPreferredSize(), LayoutManager.preferredLayoutSize(java.awt.Container)
  - 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)
  - installUI
```
public void installUI(JComponent c)
```
    Description copied from class: ComponentUI
    Configures the specified component appropriately for the look and feel. This method is invoked when the ComponentUI instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:
    1. Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
    2. Install a LayoutManager on the component if necessary.
    3. Create/add any required sub-components to the component.
    4. Create/install event listeners on the component.
    5. Create/install a PropertyChangeListener on the component in order to detect and respond to component property changes appropriately.
    6. Install keyboard UI (mnemonics, traversal, etc.) on the component.
    7. Initialize any appropriate instance data.
    Overrides:
    
    installUI in class ComponentUI
    
    Parameters:
    c - the component where this UI delegate is being installed
    See Also:
    ComponentUI.uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()
  - uninstallUI
```
public void uninstallUI(JComponent c)
```
    Description copied from class: ComponentUI
    Reverses configuration which was done on the specified component during installUI. This method is invoked when this UIComponent instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in installUI, being careful to leave the JComponent instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:
    1. Remove any UI-set borders from the component.
    2. Remove any UI-set layout managers on the component.
    3. Remove any UI-added sub-components from the component.
    4. Remove any UI-added event/property listeners from the component.
    5. Remove any UI-installed keyboard UI from the component.
    6. Nullify any allocated instance data objects to allow for GC.
    Overrides:
    
    uninstallUI in class ComponentUI
    
    Parameters:
    c - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components
    See Also:
    ComponentUI.installUI(javax.swing.JComponent), JComponent.updateUI()
  - 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
  - propertyChange
```
public void propertyChange(PropertyChangeEvent e)
```
    Description copied from interface: PropertyChangeListener
    
    This method gets called when a bound property is changed.
    
    Specified by:
    
    propertyChange in interface PropertyChangeListener
    
    Parameters:
    e - A PropertyChangeEvent object describing the event source and the property that has changed.

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-javax/swing/plaf/basic/basiclabelui.html

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Referenzen

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Inhaltsverzeichnis Haut

Class BasicLabelUI

Field Summary

Constructor Summary

Method Summary

Methods inherited from class javax.swing.plaf.ComponentUI

Methods inherited from class java.lang.Object

Field Detail

labelUI

Constructor Detail

BasicLabelUI

Method Detail

layoutCL

paintEnabledText

paintDisabledText

paint

getPreferredSize

getMinimumSize

getMaximumSize

getBaseline

getBaselineResizeBehavior

installUI

uninstallUI

installDefaults

installListeners

installComponents

installKeyboardActions

uninstallDefaults

uninstallListeners

uninstallComponents

uninstallKeyboardActions

createUI

propertyChange

Referenzen