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UIDefaults (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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JavaTM 2 Platform
Std. Ed. v1.4.1
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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. As of 1.4, support for long term storage of all JavaBeansTM has been added to the java.beans package. Please see XMLEncoder.

See Also:
UIManager

Nested 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.
 
Nested 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.
 void addResourceBundle(String bundleName)
          Adds a resource bundle to the list of resource bundles that are searched for localized values.
protected  void firePropertyChange(String propertyName, Object oldValue, Object newValue)
          Support for reporting bound property changes.
 Object get(Object key)
          Returns the value for key.
 Object get(Object key, Locale l)
          Returns the value for key associated with the given locale.
 boolean getBoolean(Object key)
          If the value of key is boolean, return the boolean value, otherwise return false.
 boolean getBoolean(Object key, Locale l)
          If the value of key for the given Locale is boolean, return the boolean value, otherwise return false.
 Border getBorder(Object key)
          If the value of key is a Border return it, otherwise return null.
 Border getBorder(Object key, Locale l)
          If the value of key for the given Locale 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.
 Color getColor(Object key, Locale l)
          If the value of key for the given Locale is a Color return it, otherwise return null.
 Locale getDefaultLocale()
          Returns the default locale.
 Dimension getDimension(Object key)
          If the value of key is a Dimension return it, otherwise return null.
 Dimension getDimension(Object key, Locale l)
          If the value of key for the given Locale 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.
 Font getFont(Object key, Locale l)
          If the value of key for the given Locale 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.
 Icon getIcon(Object key, Locale l)
          If the value of key for the given Locale 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.
 Insets getInsets(Object key, Locale l)
          If the value of key for the given Locale 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.
 int getInt(Object key, Locale l)
          If the value of key for the given Locale is an Integer return its integer value, otherwise return 0.
 PropertyChangeListener[] getPropertyChangeListeners()
          Returns an array of all the PropertyChangeListeners added to this UIDefaults with addPropertyChangeListener().
 String getString(Object key)
          If the value of key is a String return it, otherwise return null.
 String getString(Object key, Locale l)
          If the value of key for the given Locale 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 for all locales.
 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.
 void removeResourceBundle(String bundleName)
          Removes a resource bundle from the list of resource bundles that are searched for localized defaults.
 void setDefaultLocale(Locale l)
          Sets the default locale.
 
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. If the key is not found in the table then it is searched for in the list of resource bundles maintained by this object. The resource bundles are searched most recently added first using the locale returned by getDefaultLocale. LazyValues and ActiveValues are not supported in the resource bundles.

Specified by:
get in interface Map
Overrides:
get in class Hashtable
Parameters:
key - the desired key
Returns:
the value for key
Since:
1.4
See Also:
UIDefaults.LazyValue, UIDefaults.ActiveValue, Hashtable.get(java.lang.Object), getDefaultLocale(), addResourceBundle(java.lang.String)

get

public Object get(Object key,
                  Locale l)
Returns the value for key associated with the given locale. 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. If the key is not found in the table then it is searched for in the list of resource bundles maintained by this object. The resource bundles are searched most recently added first using the given locale. LazyValues and ActiveValues are not supported in the resource bundles.

Parameters:
key - the desired key
l - the desired locale
Returns:
the value for key
Since:
1.4
See Also:
UIDefaults.LazyValue, UIDefaults.ActiveValue, Hashtable.get(java.lang.Object), addResourceBundle(java.lang.String)

put

public Object put(Object key,
                  Object value)
Sets the value of key to value for all locales. 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.

Specified by:
put in interface Map
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". The key/value pairs are added for all locales.

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

getFont

public Font getFont(Object key,
                    Locale l)
If the value of key for the given Locale is a Font return it, otherwise return null.

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is a Font, return the Font object; otherwise return null
Since:
1.4

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

getColor

public Color getColor(Object key,
                      Locale l)
If the value of key for the given Locale is a Color return it, otherwise return null.

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is a Color, return the Color object; otherwise return null
Since:
1.4

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

getIcon

public Icon getIcon(Object key,
                    Locale l)
If the value of key for the given Locale is an Icon return it, otherwise return null.

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is an Icon, return the Icon object; otherwise return null
Since:
1.4

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

getBorder

public Border getBorder(Object key,
                        Locale l)
If the value of key for the given Locale is a Border return it, otherwise return null.

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is a Border, return the Border object; otherwise return null
Since:
1.4

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

getString

public String getString(Object key,
                        Locale l)
If the value of key for the given Locale is a String return it, otherwise return null.

Parameters:
key - the desired key
l - the desired Locale
Returns:
if the value for key for the given Locale is a String, return the String object; otherwise return null
Since:
1.4

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

getInt

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

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is an Integer, return its value, otherwise return 0
Since:
1.4

getBoolean

public boolean getBoolean(Object key)
If the value of key is boolean, return the boolean value, otherwise return false.

Parameters:
key - an Object specifying the key for the desired boolean value
Returns:
if the value of key is boolean, return the boolean value, otherwise return false.
Since:
1.4

getBoolean

public boolean getBoolean(Object key,
                          Locale l)
If the value of key for the given Locale is boolean, return the boolean value, otherwise return false.

Parameters:
key - an Object specifying the key for the desired boolean value
l - the desired locale
Returns:
if the value for key and Locale is boolean, return the boolean value, otherwise return false.
Since:
1.4

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

getInsets

public Insets getInsets(Object key,
                        Locale l)
If the value of key for the given Locale is an Insets return it, otherwise return null.

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is an Insets, return the Insets object; otherwise return null
Since:
1.4

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

getDimension

public Dimension getDimension(Object key,
                              Locale l)
If the value of key for the given Locale is a Dimension return it, otherwise return null.

Parameters:
key - the desired key
l - the desired locale
Returns:
if the value for key and Locale is a Dimension, return the Dimension object; otherwise return null
Since:
1.4

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 necessary 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

getPropertyChangeListeners

public PropertyChangeListener[] getPropertyChangeListeners()
Returns an array of all the PropertyChangeListeners added to this UIDefaults with addPropertyChangeListener().

Returns:
all of the PropertyChangeListeners added or an empty array if no listeners have been added
Since:
1.4

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

addResourceBundle

public void addResourceBundle(String bundleName)
Adds a resource bundle to the list of resource bundles that are searched for localized values. Resource bundles are searched in the reverse order they were added. In other words, the most recently added bundle is searched first.

Parameters:
bundleName - the base name of the resource bundle to be added
Since:
1.4
See Also:
ResourceBundle, removeResourceBundle(java.lang.String)

removeResourceBundle

public void removeResourceBundle(String bundleName)
Removes a resource bundle from the list of resource bundles that are searched for localized defaults.

Parameters:
bundleName - the base name of the resource bundle to be removed
Since:
1.4
See Also:
ResourceBundle, addResourceBundle(java.lang.String)

setDefaultLocale

public void setDefaultLocale(Locale l)
Sets the default locale. The default locale is used in retrieving localized values via get methods that do not take a locale argument. As of release 1.4, Swing UI objects should retrieve localized values using the locale of their component rather than the default locale. The default locale exists to provide compatibility with pre 1.4 behaviour.

Since:
1.4
See Also:
getDefaultLocale(), get(Object), get(Object,Locale)

getDefaultLocale

public Locale getDefaultLocale()
Returns the default locale. The default locale is used in retrieving localized values via get methods that do not take a locale argument. As of release 1.4, Swing UI objects should retrieve localized values using the locale of their component rather than the default locale. The default locale exists to provide compatibility with pre 1.4 behaviour.

Since:
1.4
See Also:
setDefaultLocale(java.util.Locale), get(Object), get(Object,Locale)
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JavaTM 2 Platform
Std. Ed. v1.4.1
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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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