Java 2 Platform SE v1.3.1: Class UIDefaults

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Java^TM 2 Platform
Std. Ed. v1.3.1

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javax.swing
Class UIDefaults

java.lang.Object
  |
  +--java.util.Dictionary
        |
        +--java.util.Hashtable
              |
              +--javax.swing.UIDefaults

All Implemented Interfaces:: Cloneable, Map, Serializable

public class UIDefaults
extends Hashtable

A table of defaults for Swing components. Applications can set/get default values via the UIManager.

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:: UIManager, Serialized Form

Inner Class Summary

static interface UIDefaults.ActiveValue
          This class enables one to store an entry in the defaults table that's constructed each time it's looked up with one of the getXXX(key) methods.

static class UIDefaults.LazyInputMap
          LazyInputMap will create a InputMap in its createValue method.

static interface UIDefaults.LazyValue
          This class enables one to store an entry in the defaults table that isn't constructed until the first time it's looked up with one of the getXXX(key) methods.

static class UIDefaults.ProxyLazyValue
          This class provides an implementation of LazyValue which can be used to delay loading of the Class for the instance to be created.

Inner classes inherited from class java.util.Map

Map.Entry

Constructor Summary

UIDefaults()
          Create an empty defaults table.

UIDefaults(Object[] keyValueList)
          Create a defaults table initialized with the specified key/value pairs.

Method Summary

void addPropertyChangeListener(PropertyChangeListener listener)
          Adds a PropertyChangeListener to the listener list.

protected void firePropertyChange(String propertyName, Object oldValue, Object newValue)
          Support for reporting bound property changes.

Object get(Object key)
          Returns the value for key.

Border getBorder(Object key)
          If the value of key is a Border return it, otherwise return null.

Color getColor(Object key)
          If the value of key is a Color return it, otherwise return null.

Dimension getDimension(Object key)
          If the value of key is a Dimension return it, otherwise return null.

Font getFont(Object key)
          If the value of key is a Font return it, otherwise return null.

Icon getIcon(Object key)
          If the value of key is an Icon return it, otherwise return null.

Insets getInsets(Object key)
          If the value of key is an Insets return it, otherwise return null.

int getInt(Object key)
          If the value of key is an Integer return its integer value, otherwise return 0.

String getString(Object key)
          If the value of key is a String return it, otherwise return null.

ComponentUI getUI(JComponent target)
          Creates an ComponentUI implementation for the specified component.

Class getUIClass(String uiClassID)
          Returns the L&F class that renders this component.

Class getUIClass(String uiClassID, ClassLoader uiClassLoader)
          The value of get(uidClassID) must be the String name of a class that implements the corresponding ComponentUI class.

protected void getUIError(String msg)
          If getUI() fails for any reason, it calls this method before returning null.

Object put(Object key, Object value)
          Sets the value of key to value.

void putDefaults(Object[] keyValueList)
          Puts all of the key/value pairs in the database and unconditionally generates one PropertyChangeEvent.

void removePropertyChangeListener(PropertyChangeListener listener)
          Removes a PropertyChangeListener from the listener list.

Methods inherited from class java.util.Hashtable

clear, clone, contains, containsKey, containsValue, elements, entrySet, equals, hashCode, isEmpty, keys, keySet, putAll, rehash, remove, size, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UIDefaults

public UIDefaults()

Create an empty defaults table.

UIDefaults

public UIDefaults(Object[] keyValueList)

Create a defaults table initialized with the specified key/value pairs. For example:

Object[] uiDefaults = {
"Font", new Font("Dialog", Font.BOLD, 12),
"Color", Color.red,
"five", new Integer(5)
}
UIDefaults myDefaults = new UIDefaults(uiDefaults);

Parameters:: keyValueList - an array of objects containing the key/value pairs

Method Detail

get

public Object get(Object key)

Returns the value for key. If the value is a UIDefaults.LazyValue then the real value is computed with LazyValue.createValue(), the table entry is replaced, and the real value is returned. If the value is an UIDefaults.ActiveValue the table entry is not replaced - the value is computed with ActiveValue.createValue() for each get() call.

Overrides:: get in class Hashtable

Parameters:: key - the desired key
Returns:: the value for key
See Also:: UIDefaults.LazyValue, UIDefaults.ActiveValue, Hashtable.get(java.lang.Object)

put

public Object put(Object key,
                  Object value)

Sets the value of key to value. If key is a string and the new value isn't equal to the old one, fire a PropertyChangeEvent. If value is null, the key is removed from the table.

Overrides:: put in class Hashtable

Parameters:: key - the unique Object who's value will be used to retrieve the data value associated with it; value - the new Object to store as data under that key
Returns:: the previous Object value, or null
See Also:: putDefaults(java.lang.Object[]), Hashtable.put(java.lang.Object, java.lang.Object)

putDefaults

public void putDefaults(Object[] keyValueList)

Puts all of the key/value pairs in the database and unconditionally generates one PropertyChangeEvent. The events oldValue and newValue will be null and its propertyName will be "UIDefaults".

Parameters:: keyValueList - an array of key/value pairs
See Also:: put(java.lang.Object, java.lang.Object), Hashtable.put(java.lang.Object, java.lang.Object)

getFont

public Font getFont(Object key)

If the value of key is a Font return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is a Font, return the Font object; otherwise return null

getColor

public Color getColor(Object key)

If the value of key is a Color return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is a Color, return the Color object; otherwise return null

getIcon

public Icon getIcon(Object key)

If the value of key is an Icon return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is an Icon, return the Icon object; otherwise return null

getBorder

public Border getBorder(Object key)

If the value of key is a Border return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is a Border, return the Border object; otherwise return null

getString

public String getString(Object key)

If the value of key is a String return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is a String, return the String object; otherwise return null

getInt

public int getInt(Object key)

If the value of key is an Integer return its integer value, otherwise return 0.

Parameters:: key - the desired key
Returns:: if the value for key is an Integer, return its value, otherwise return 0

getInsets

public Insets getInsets(Object key)

If the value of key is an Insets return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is an Insets, return the Insets object; otherwise return null

getDimension

public Dimension getDimension(Object key)

If the value of key is a Dimension return it, otherwise return null.

Parameters:: key - the desired key
Returns:: if the value for key is a Dimension, return the Dimension object; otherwise return null

getUIClass

public Class getUIClass(String uiClassID,
                        ClassLoader uiClassLoader)

The value of get(uidClassID) must be the String name of a class that implements the corresponding ComponentUI class. If the class hasn't been loaded before, this method looks up the class with uiClassLoader.loadClass() if a non null class loader is provided, classForName() otherwise.

If a mapping for uiClassID exists or if the specified class can't be found, return null.

This method is used by getUI, it's usually not neccessary to call it directly.

Parameters:: uiClassID - a string containing the class ID; uiClassLoader - the object which will load the class
Returns:: the value of Class.forName(get(uidClassID))
See Also:: getUI(javax.swing.JComponent)

getUIClass

public Class getUIClass(String uiClassID)

Returns the L&F class that renders this component.

Parameters:: uiClassID - a string containing the class ID
Returns:: the Class object returned by getUIClass(uiClassID, null)

getUIError

protected void getUIError(String msg)

If getUI() fails for any reason, it calls this method before returning null. Subclasses may choose to do more or less here.

Parameters:: msg - message string to print
See Also:: getUI(javax.swing.JComponent)

getUI

public ComponentUI getUI(JComponent target)

Creates an ComponentUI implementation for the specified component. In other words create the look and feel specific delegate object for target. This is done in two steps:

Look up the name of the ComponentUI implementation class under the value returned by target.getUIClassID().
Use the implementation classes static createUI() method to construct a look and feel delegate.

Parameters:: target - the JComponent which needs a UI
Returns:: the ComponentUI object

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Adds a PropertyChangeListener to the listener list. The listener is registered for all properties.

A PropertyChangeEvent will get fired whenever a default is changed.

Parameters:: listener - the PropertyChangeListener to be added
See Also:: PropertyChangeSupport

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Removes a PropertyChangeListener from the listener list. This removes a PropertyChangeListener that was registered for all properties.

Parameters:: listener - the PropertyChangeListener to be removed
See Also:: PropertyChangeSupport

firePropertyChange

protected void firePropertyChange(String propertyName,
                                  Object oldValue,
                                  Object newValue)

Support for reporting bound property changes. If oldValue and newValue are not equal and the PropertyChangeEventx listener list isn't empty, then fire a PropertyChange event to each listener.

Parameters:: propertyName - the programmatic name of the property that was changed; oldValue - the old value of the property; newValue - the new value of the property
See Also:: PropertyChangeSupport

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Java^TM 2 Platform
Std. Ed. v1.3.1

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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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javax.swing Class UIDefaults

UIDefaults

UIDefaults

get

put

putDefaults

getFont

getColor

getIcon

getBorder

getString

getInt

getInsets

getDimension

getUIClass

getUIClass

getUIError

getUI

addPropertyChangeListener

removePropertyChangeListener

firePropertyChange

javax.swing
Class UIDefaults