Module java.desktop

Package javax.swing

Class AbstractAction

java.lang.Object

javax.swing.AbstractAction

All Implemented Interfaces:

ActionListener, Serializable, Cloneable, EventListener, Action

Direct Known Subclasses:

BasicDesktopPaneUI.CloseAction, BasicDesktopPaneUI.MaximizeAction, BasicDesktopPaneUI.MinimizeAction, BasicDesktopPaneUI.NavigateAction, BasicDesktopPaneUI.OpenAction, BasicFileChooserUI.ApproveSelectionAction, BasicFileChooserUI.CancelSelectionAction, BasicFileChooserUI.ChangeToParentDirectoryAction, BasicFileChooserUI.GoHomeAction, BasicFileChooserUI.NewFolderAction, BasicFileChooserUI.UpdateAction, BasicInternalFrameTitlePane.CloseAction, BasicInternalFrameTitlePane.IconifyAction, BasicInternalFrameTitlePane.MaximizeAction, BasicInternalFrameTitlePane.MoveAction, BasicInternalFrameTitlePane.RestoreAction, BasicInternalFrameTitlePane.SizeAction, BasicSliderUI.ActionScroller, BasicTreeUI.TreeCancelEditingAction, BasicTreeUI.TreeHomeAction, BasicTreeUI.TreeIncrementAction, BasicTreeUI.TreePageAction, BasicTreeUI.TreeToggleAction, BasicTreeUI.TreeTraverseAction, MetalFileChooserUI.DirectoryComboBoxAction, TextAction

public abstract class AbstractAction
extends Object
implements Action, Cloneable, Serializable

This class provides default implementations for the JFC Action interface. Standard behaviors like the get and set methods for Action object properties (icon, text, and enabled) are defined here. The developer need only subclass this abstract class and define the actionPerformed method.

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.

Since:

1.2

See Also:

Action, Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected SwingPropertyChangeSupport	changeSupport	If any PropertyChangeListeners have been registered, the changeSupport field describes them.
protected boolean	enabled	Specifies whether action is enabled; the default is true.

Fields inherited from interface javax.swing.Action

ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, DISPLAYED_MNEMONIC_INDEX_KEY, LARGE_ICON_KEY, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SELECTED_KEY, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

Constructors

Constructor	Description
AbstractAction()	Creates an Action.
AbstractAction(String name)	Creates an Action with the specified name.
AbstractAction(String name, Icon icon)	Creates an Action with the specified name and small icon.

Method Summary

Modifier and Type	Method	Description
void	addPropertyChangeListener(PropertyChangeListener listener)	Adds a PropertyChangeListener to the listener list.
protected Object	clone()	Clones the abstract action.
protected void	firePropertyChange(String propertyName, Object oldValue, Object newValue)	Supports reporting bound property changes.
Object[]	getKeys()	Returns an array of Objects which are keys for which values have been set for this AbstractAction, or null if no keys have values set.
PropertyChangeListener[]	getPropertyChangeListeners()	Returns an array of all the PropertyChangeListeners added to this AbstractAction with addPropertyChangeListener().
Object	getValue(String key)	Gets the Object associated with the specified key.
boolean	isEnabled()	Returns true if the action is enabled.
void	putValue(String key, Object newValue)	Sets the Value associated with the specified key.
void	removePropertyChangeListener(PropertyChangeListener listener)	Removes a PropertyChangeListener from the listener list.
void	setEnabled(boolean newValue)	Sets whether the Action is enabled.

Methods inherited from interface javax.swing.Action

accept

Methods inherited from interface java.awt.event.ActionListener

actionPerformed

Methods inherited from class java.lang.Object

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

Field Detail

enabled

protected boolean enabled

Specifies whether action is enabled; the default is true.

changeSupport

protected SwingPropertyChangeSupport changeSupport

If any PropertyChangeListeners have been registered, the changeSupport field describes them.

Constructor Detail

AbstractAction

public AbstractAction()

Creates an Action.

AbstractAction

public AbstractAction(String name)

Creates an Action with the specified name.

Parameters:

name - the name (Action.NAME) for the action; a value of null is ignored

AbstractAction

public AbstractAction(String name,
                      Icon icon)

Creates an Action with the specified name and small icon.

Parameters:

name - the name (Action.NAME) for the action; a value of null is ignored

icon - the small icon (Action.SMALL_ICON) for the action; a value of null is ignored

Method Detail

getValue

public Object getValue(String key)

Gets the Object associated with the specified key.

Specified by:

getValue in interface Action

Parameters:

key - a string containing the specified key

Returns:

the binding Object stored with this key; if there are no keys, it will return null

See Also:

Action.getValue(java.lang.String)

putValue

public void putValue(String key,
                     Object newValue)

Sets the Value associated with the specified key.

Specified by:

putValue in interface Action

Parameters:

key - the String that identifies the stored object

newValue - the Object to store using this key

See Also:

Action.putValue(java.lang.String, java.lang.Object)

isEnabled

public boolean isEnabled()

Returns true if the action is enabled.

Specified by:

isEnabled in interface Action

Returns:

true if the action is enabled, false otherwise

See Also:

Action.isEnabled()

setEnabled

public void setEnabled(boolean newValue)

Sets whether the Action is enabled. The default is true.

Specified by:

setEnabled in interface Action

Parameters:

newValue - true to enable the action, false to disable it

See Also:

Action.setEnabled(boolean)

getKeys

public Object[] getKeys()

Returns an array of Objects which are keys for which values have been set for this AbstractAction, or null if no keys have values set.

Returns:

an array of key objects, or null if no keys have values set

Since:

1.3

firePropertyChange

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

Supports reporting bound property changes. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.

Parameters:

propertyName - the name of the property that has changed

oldValue - the old value of the property

newValue - the new value of the property

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 in response to setting a bound property, e.g. setFont, setBackground, or setForeground. Note that if the current component is inheriting its foreground, background, or font from its container, then no event will be fired in response to a change in the inherited property.

Specified by:

addPropertyChangeListener in interface Action

Parameters:

listener - The PropertyChangeListener to be added

See Also:

Action.addPropertyChangeListener(java.beans.PropertyChangeListener)

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

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

Specified by:

removePropertyChangeListener in interface Action

Parameters:

listener - the PropertyChangeListener to be removed

See Also:

Action.removePropertyChangeListener(java.beans.PropertyChangeListener)

getPropertyChangeListeners

public PropertyChangeListener[] getPropertyChangeListeners()

Returns an array of all the PropertyChangeListeners added to this AbstractAction with addPropertyChangeListener().

Returns:

all of the PropertyChangeListeners added or an empty array if no listeners have been added

Since:

1.4

clone

protected Object clone()
                throws CloneNotSupportedException

Clones the abstract action. This gives the clone its own copy of the key/value list, which is not handled for you by Object.clone().

Overrides:

clone in class Object

Returns:

a clone of this instance.

Throws:

CloneNotSupportedException - if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.

See Also:

Cloneable